Control device for internal combustion engine

FIELD: motors and pumps.

SUBSTANCE: in control device for internal combustion engines the pressure sensor (34) inside the cylinder is intended for measurement of pressure P in the cylinder of the internal combustion engine (10). When consecutive or almost consecutive premature ignition is detected by the pressure sensor in the cylinder (34) the control unit hinders the control of suppression of consecutive occurrence of premature ignition when Pmax during premature ignition is low, in comparison with when Pmax during premature ignition is high.

EFFECT: ensuring balance between prevention of excessive rise of the piston temperature and prevention of deterioration of various operational characteristics of internal combustion engines as a result of control applied for suppression of abnormal combustion even when abnormal combustion happens consistently or almost consistently during a series of cycles.

5 cl, 11 dwg

 

Area of technology

[0001]

The present invention relates to the control device for an internal combustion engine.

Background of the INVENTION

The level of technology

[0002]

To date, the control device for combustion of the internal combustion engine has been described, for example, in patent document 1. This known control device combustion detects abnormal combustion (pre-ignition) on the basis of the output value of the pressure inside the cylinder for determining the pressure inside the cylinder. In addition, the detection of premature ignition decreases the ignition timing or the enrichment of the air fuel mixture to delay premature ignition.

Besides the abovementioned document, the applicant is also aware of the following documents, as relevant to the level of technology of the present invention.

Patent documents

[0003]

Patent document 1: Japanese laid patent application No. 3-57878

Patent document 2: Japanese laid patent application No. 2009-115041

Patent document 3: Japanese laid patent application No. 2003-176751

Summary of the INVENTION

1. Technical problem

[0004]

If abnormal combustion (pre-ignition) occurs consistently or practical�Ki sequentially over a plurality of cycles, it increases the temperature of the piston. When as a result, the temperature of the piston is excessively increased, it becomes difficult to ensure the durability of the piston to continue the work. On the other hand, during the occurrence of abnormal combustion raising the temperature of the piston can be prevented by performing control by suppression of abnormal combustion (such as reducing the ignition timing, the enrichment of the air fuel mixture or reducing the fuel supply), as in the technology described in the aforementioned patent document 1. However, if such management is suppressing abnormal combustion, there are concerns that will worsen various operational parameters of the internal combustion engine (such as output power, the suppression of exhaust emissions, fuel consumption or safety while driving).

[0005]

An inverse relationship between the value of pressure inside the cylinder at the time of occurrence of abnormal combustion and the frequency of occurrence of abnormal combustion. In addition, we can say that even if abnormal combustion occurs with high frequency, the temperature of the piston is unlikely to increase if the maximum value of the pressure inside the cylinder, occurs when abnormal combustion is low on CP�neniu with the case, when the maximum value of the pressure inside the cylinder is high. Thus, it is possible to prevent deterioration of the aforementioned operational parameters of the internal combustion engine, what is the optimal relationship in suppressing abnormal combustion, while preventing the temperature rise of the piston, caused by execution of control by suppression of abnormal combustion in accordance with the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion.

[0006]

The present invention is directed to solving the above problems and has as its goal the creation of a steering device for an internal combustion engine, which can provide a good balance between prevention of excessive temperature rise of the piston and preventing deterioration in performance of an internal combustion engine as a result of suppression of abnormal combustion even when the abnormal combustion occurs consistently or almost consistently in the set of cycles.

2. The solution to the problem

[0007]

The first aspect of the present invention is a control device for an internal combustion engine, containing:

measuring device Yes�tion within the cylinder for measuring the pressure inside the cylinder of the internal combustion engine;

device detection of abnormal combustion for detecting the presence or absence of abnormal combustion based on measurement of the pressure inside the cylinder, measured using the device for measuring the pressure inside the cylinder; and

the adjustment device management suppressing abnormal combustion in order, when the detected consecutive or almost consecutive occurrence of abnormal combustion, to make difficult the execution of suppressing abnormal combustion control device suppressing abnormal combustion when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is low compared with when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is high.

[0008]

The second aspect of the present invention is a control device for an internal combustion engine in accordance with the first aspect of the present invention,

in which the adjustment device management suppressing abnormal combustion involves the evaluation of the rate of increase in temperature of the piston to measure the magnitude of temperature rise of the piston due to the occurrence of abnormal combustion based on the works of pace age�tion temperature of the piston, which is set to increase with the increase of the maximum pressure inside the cylinder at the time of occurrence of abnormal combustion, the number of cases of occurrence of abnormal combustion, and

in which upon detection of consecutive or nearly consecutive occurrence of abnormal combustion device adjustment control suppressing abnormal combustion executes the suppression control of abnormal combustion such that the temperature of the piston, calculated on the basis of the rate of temperature rise of the piston, evaluated by the evaluation device of the rate of temperature rise of the piston, becomes lower than a predetermined allowable temperature.

[0009]

The third aspect of the present invention is a control device for an internal combustion engine in accordance with the first aspect of the present invention,

in which the adjustment device management suppressing abnormal combustion performs the control of suppressing abnormal combustion in the case where the number of cases of occurrence of abnormal combustion is detected, consecutive or almost consecutive occurrence of the abnormal combustion has reached a predetermined permissible number of cases of occurrence of abnormal combustion,

in which the number of occurrences of abnormal combustion varies depending on the maximum pressure inside the cylinder at the time of occurrence of abnormal combustion, and

at the same time allowed the number of cases of occurrence of abnormal combustion, which is used when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is low, exceeds the number of cases of occurrence of abnormal combustion, which is used when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is high.

[0010]

A fourth aspect of the present invention is a control device for an internal combustion engine according to a third aspect of the present invention and further comprises the first device changes the allowed number of occurrences of abnormal combustion in order, when the frequency of occurrence of abnormal combustion measured for each maximum value of the pressure inside the cylinder in relation to at least two maximum values of the pressure inside the cylinder during operation of the internal combustion engine, to increase the allowable number of occurrences of abnormal combustion for individual maximum values �of Alenia inside the cylinder, and yet to reduce the number of cases of occurrence of abnormal combustion for another, at least one maximum value of the pressure inside the cylinder in the case where the frequency of occurrence of abnormal combustion at the same time separate the maximum value of the pressure inside the cylinder is higher than or equal to the first predetermined value.

[0011]

A fifth aspect of the present invention is a control device for an internal combustion engine according to the third or fourth aspect of the present invention and further comprises a second device changes the allowed number of occurrences of abnormal combustion in order, when the frequency of occurrence of abnormal combustion measured for each maximum value of the pressure inside the cylinder in relation to at least two maximum values of the pressure inside the cylinder during operation of the internal combustion engine, to reduce the number of cases of occurrence of abnormal combustion for selected maximum pressure inside the cylinder, and to increase the allowable number of occurrences of abnormal combustion for the other at least one maximum value of the pressure inside the cylinder in the case where the frequency of occurrence of abnormal combustion when it� separate maximum pressure inside the cylinder is lower or equal to the second predetermined value.

Advantages of the INVENTION

[0012]

According to the first aspect of the present invention, the execution control suppressing abnormal combustion is facilitated, when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is high (when the temperature of the piston is most likely expected to increase compared with when the maximum value of the pressure inside the cylinder is low) compared with when the maximum value of the pressure inside the cylinder is low. In bringing the temperature of the piston can be successfully avoided excessive temperature increase during the occurrence of abnormal combustion in a situation where the maximum value of the pressure inside the cylinder is high. On the other hand, the performance of the control by suppression of abnormal combustion becomes more difficult when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is low (when the frequency of occurrence of abnormal combustion becomes higher than the same frequency, when the maximum value of the pressure inside the cylinder is high), compared with when the maximum value of the pressure inside the cylinder is high. Therefore, in a situation where the maximum value of the pressure inside the cylinder is low, we can prevent�ü deterioration of various operational parameters of the internal combustion engine (such, as exhaust emissions) as a result of frequent administration of suppressing abnormal combustion. As described above, the present invention makes it possible to successfully achieve a good balance between preventing excessive temperature rise of the piston and preventing the deterioration of various operational parameters of the internal combustion engine as a result of executing the control of suppressing abnormal combustion, even when the abnormal combustion occurs consistently or almost consistently in the set of cycles.

[0013]

According to the second aspect of the present invention, the magnitude of temperature increase is assessed as lower value when abnormal combustion occurs consistently or almost consistently in a situation where the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is low than when abnormal combustion occurs consistently or almost consistently in a situation where the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is high. Because of this, the number of times of abnormal combustion, which is valid before the commencement of the management of suppression of abnormal combustion becomes larger in the case when m�kimalee the pressure inside the cylinder at the time of occurrence of abnormal combustion is low, compared with the case where the maximum value of the pressure inside the cylinder is high. In other words, when the detected consecutive or almost consecutive occurrence of abnormal combustion, the present invention may hinder the performance of the control by suppression of abnormal combustion when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is low compared with when the maximum pressure inside the cylinder is high. In addition, the present invention can provide accurate temperature control of the piston, regardless of the size of the individual maximum values of the pressure inside the cylinder, when the detected consecutive or almost consecutive occurrence of abnormal combustion.

[0014]

According to a third aspect of the present invention, when the abnormal combustion occurs sequentially or substantially sequentially, the control of suppressing abnormal combustion is performed only if the number of occurrences of abnormal combustion in accordance with the maximum value of the pressure inside the cylinder during any occurrence of abnormal combustion has reached the allowed number of occurrences of abnormal combustion, which is installed for each maximum�about the pressure inside the cylinder at the time of occurrence of abnormal combustion. In addition, in the present invention the number of cases of occurrence of abnormal combustion, which is used when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is low, is set larger than the maximum number of occurrences of abnormal combustion, which is used when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is high. Therefore, when the detected consecutive or almost consecutive occurrence of abnormal combustion, the present invention can also impede the performance of the control by suppression of abnormal combustion when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is low compared with when it is high.

[0015]

According to the fourth aspect of the present invention, when the frequency of occurrence of abnormal combustion when the individual maximum value of the pressure inside the cylinder is higher than or equal to the first predetermined value, performs control to increase the allowable number of occurrences of abnormal combustion for selected maximum pressure inside the cylinder and thus reduce the number of cases of occurrence of events�professional combustion for the other at least one maximum value of the pressure inside the cylinder. Even when the frequency of occurrence of abnormal combustion in accordance with a maximum value of the pressure inside the cylinder increases during operation of the internal combustion engine, such a shift makes it possible to achieve overall good balance to the aggregate accumulated fatigue in the piston is not increased as a result of successive or nearly successive occurrences of abnormal combustion, together with the frequent suppression control of suppressing abnormal combustion in response to the occurrence of abnormal combustion in accordance with a maximum value of the pressure inside the cylinder, respectively, whereby the frequency of occurrence increased. As a result, even when it is assumed that will be a consistent or substantially consistent occurrence of abnormal combustion, the durability of the piston can be successfully achieved without a concomitant increase in the weight of the piston to increase its strength.

[0016]

According to the fifth aspect of the present invention, when the frequency of occurrence of abnormal combustion when the individual maximum value of the pressure inside the cylinder is lower than the second preset value, you�aneesa management, to reduce the number of cases of occurrence of abnormal combustion for selected maximum pressure inside the cylinder, and thus to increase the allowable number of occurrences of abnormal combustion for another, at least one maximum value of the pressure inside the cylinder. Even when the frequency of occurrence of abnormal combustion in accordance with a maximum value of the pressure inside the cylinder is reduced during operation of the internal combustion engine, this makes it possible to achieve a good balance as a whole to collectively accumulated fatigue in the piston is not increased as a result of successive or nearly successive occurrences of abnormal combustion, while additionally suppressing frequent performance management suppressing abnormal combustion in accordance with another at least one maximum value of the pressure inside the cylinder

BRIEF description of the DRAWINGS

[0017]

Fig.1 is a diagram explaining a system configuration of an internal combustion engine in accordance with the first variant implementation of the present invention;

Fig.2 shows a plot of Pθ, showing every curve of pressure within the cylinder during normal combustion in the case of expiration�I premature ignition;

Fig.3 shows a graph showing a work area where there is a premature ignition;

Fig.4 is a graph showing the relationship between the calculated temperature of the piston and a torque of the internal combustion engine;

Fig.5 shows a graph representing the trend of increasing the temperature of the piston in the ratio between the number of sequentially encountered premature firings and the maximum pressure pmax within the cylinder;

Fig.6 is a table representing the relationship between the maximum pressure pmax within the cylinder during the occurrence of premature ignition, the magnitude of temperature increase ΔT and the valid sequence number n premature firings;

Fig.7 shows a graph representing the trend in the allowable number n sequence, and premature firings in relation to the change of the maximum pressure inside the cylinder pmax during the occurrence of premature ignition;

Fig.8 presents a block diagram of the sequence of actions that are performed in the first embodiment of the present invention;

Fig.9 shows a chart for explaining the expert management of acceptable sequence number n of the ej�military firings;

Fig.10 presents a block diagram of the sequence of actions that are performed in the first embodiment of the present invention;

Fig.11 presents a block diagram representing the sequence of actions for the implementation of expert control valid number sequence, and n premature igniting.

Embodiments of the INVENTION

[0018]

The first option

[System configuration of first embodiment]

Fig.1 is a diagram used for explaining a system configuration of an internal combustion engine 10 in accordance with the first variant implementation of the present invention. The system shown in Fig.1, includes an internal combustion engine 10. The piston 12 is located inside the cylinder of the internal combustion engine 10. Inside the cylinder above the upper surface of the piston 12 is formed a combustion chamber 14. With the combustion chamber 14 are communicated to the inlet port 16 and an outlet 18.

[0019]

Sensor air flow 20, which generates a signal corresponding to the flow rate of air being sucked into the intake channel 16, is located near the inlet of the inlet channel 16. The compressor 22A turbocharger 22 is located in the inlet channel 16 on the output side of the stock air flow sensor 20. In addition, El�throne controlled throttle valve 24 is installed in the inlet channel 16 on the outlet of the compressor 22a.

[0020]

In each cylinder of the internal combustion engine 10 is installed injector for fuel injection 26 for direct fuel injection into the combustion chamber 14 (cylinder) and the spark plug 28 for igniting the air-fuel mixture. In addition, the turbine 22b of the turbocharger 22 is located in the exhaust channel 18. The catalyst 30 for cleaning exhaust gases is located in the exhaust channel 18 at the outlet of the turbine 22b.

[0021]

In addition, the system shown in Fig.1 includes an ECU (Electronic Control Unit electronic control unit) 32. To the inputs of unit ECU 32 is connected to various types of sensors for determining the operating state of the internal combustion engine 10, such as a pressure sensor within the cylinder 34 for determining the pressure P inside the cylinder and the angle sensor crankshaft 36 to determine the frequency of rotation of the motor, and the stock air flow sensor 20 described above. In addition, to the outputs of the ECU 32 is connected to various types of actuators to control the operation of the internal combustion engine 10, such as a throttle valve 24, a fuel injector for injecting fuel 26 and the spark plug 28, which is described above. The ECU 32 controls the operating state of the internal combustion engine 10, powering various types of actuators based on the output signals of each sensor and Saran�e installed programs.

[0022]

[The sound of the piston with regard to the occurrence of premature ignition]

Fig.2 shows a plot of P (pressure inside the cylinder) of θ (the rotation angle of the crankshaft), showing every curve of change of pressure within the cylinder during normal combustion and in the event of premature ignition.

Fig.2 shows the variation of the pressure P inside the cylinder during the compression stroke and stroke. As shown in Fig.2, when a premature ignition (hereinafter abbreviated for simplicity as "PREIG"), were as abnormal combustion, the pressure inside the cylinder P is growing rapidly at an earlier point in time, as compared to the case of normal combustion. As a result, when a premature ignition of the PREIG occurred, then the maximum value of the pressure inside the cylinder during one cycle (hereinafter mostly referred to as "maximum pressure inside the cylinder pmax") shows a value greater than at the same time during normal combustion. In this regard, the maximum value on the curve averaged values of pressure fluctuations P during the occurrence of premature ignition PREIG inside the cylinder is used as the maximum pressure inside the cylinder pmax.

[0023]

Fig.3 shows Gras�IR, showing the working area in which there is a premature ignition. In addition, in Fig.4 is a graph showing the relationship between the calculated temperature of the piston and a torque of the internal combustion engine 10. The values of torque from A to C in Fig.4 correspond to the values of torque at the engine speed NE_1 in Fig.3.

[0024]

As shown in Fig.3, the area with low rpm and high load (torque) of the internal combustion engine 10 is a working area (area of occurrence of premature ignition), in which a high probability of premature ignition. The temperature of the piston 12 increases with the load (torque). For this reason, as shown in Fig.4, the calculated temperature of the piston (more specifically, the estimated temperature of the relevant part (e.g., top)) set (allowed) to rise with the increase in torque. In addition, as shown in Fig.4, allowable temperature of the piston Tmax to ensure a predetermined strength of the piston is set as the value of having a reserve with respect to the reference temperature of the piston, taking into account also the occurrence of premature ignition.

[0025]

Fig.5 shows a graph�to, show the trend of increasing the temperature of the piston 12 in the ratio between the number of sequentially encountered premature firings and the maximum pressure pmax within the cylinder.

When there is a premature ignition, the temperature of the piston 12 increases. If premature ignition occurred only once, the temperature of the piston 12 immediately returns to the original value, even if it has increased. However, if premature ignition occurs sequentially, the temperature of the piston 12 will continue to grow. More specifically, as shown in Fig.5, the temperature of the piston 12 becomes higher as the number of sequentially encountered premature firings increases. In addition, the magnitude of temperature increase DT of the piston 12 increases the maximum pressure inside the cylinder pmax during the occurrence of premature ignition (hereinafter abbreviated for simplicity as "pmax during the premature ignition"). In this regard, the consistent occurrence of premature firings in this case corresponds to premature ignition, which consistently occurs over multiple cycles in the same cylinder. In addition, pmax during the premature ignition of the solicitation�corresponds to the maximum value of the pressure inside the cylinder during the cycle, in which premature ignition.

[0026]

Area of premature ignition (Fig.3) corresponds to the zone of high load. Thus, in the case where the area of occurrence of premature ignition is consistently used, the temperature of the piston 12 is likely to be high initially. In this case, if the premature ignition occurs consistently (especially if the incidence of premature ignition increases when the maximum pressure inside the cylinder pmax is high), the temperature of the piston 12 increases beyond a predetermined allowable temperature of the piston Tmax, and therefore there is concern regarding issues of ensuring the strength of the piston.

[0027]

Accordingly, in order to prevent the rapid increase in the temperature of the piston 12 due to consistently emerged premature firings should be possible to perform the ongoing management of suppression of premature ignition (for example, enriching the air / fuel mixture or reducing the supply of fuel) to suppress (permissions) consistently emerged premature firings. However, if the sequential occurrence of premature firings often occurs when the specific work comprising�AI in the zone of occurrence of premature ignition and the enrichment of the air fuel mixture as the management of the sequential suppression of the occurrence of premature ignition occurs frequently, then there is a fear that the characteristics of exhaust emissions can deteriorate. In addition, if the reduction in the fuel delivery as the management of the sequential suppression of the occurrence of premature ignition is performed frequently, there is a risk that may deteriorate the controllability of the internal combustion engine 10.

[0028]

On the other hand, in order to sufficiently ensure the strength of the piston, instead of relying on control of the sequential suppression of the occurrence of premature ignition described above in the situation in which it is assumed the occurrence of consecutive premature firings, it is possible to design the strength of the piston with the intention sufficient (excess) of its increase. However, if such a design is made, becomes a problem of increased weight of the piston due to the increase of its thickness. In addition, if we assume that the same internal combustion engine is used in different environments or for different types of vehicles, it is likely that the incidence of premature ignition in the state, � where pmax during the premature ignition is high, will vary due to the difference in operating conditions or types of vehicle, and the piston needs to be changed according to the conditions of operation or type of vehicle. This creates problems for the interchangeability of parts of the internal combustion engine.

[0029]

Fig.6 is a table showing the relationship between the maximum pressure pmax within the cylinder during the occurrence of premature ignition, the magnitude of temperature increase ΔT and the valid sequence number n premature firings. In addition, in Fig.7 shows a graph showing the trend in the allowable number n sequence, and premature firings in relation to the change of the maximum pressure inside the cylinder pmax during the occurrence of premature ignition. The ratio in Fig.6 and 7 corresponds to one example of a situation in which the engine speed is a predetermined value NE_1 indicated on the previously described Fig.3, and the torque is the predetermined value A in the same figure.

[0030]

In the present embodiment, as shown in Fig.5, it is assumed that the magnitude of temperature increase ΔT of the piston 12 is the result of premature FOTS�of amentia with increasing pmax at the time of premature ignition. In addition, as shown in Fig.6, the amount of temperature increase ΔT and the maximum number n sequence, and premature firings should be determined in accordance with the value of pmax at the time of premature ignition. More specifically, the allowable number n of successively occurring premature firings is the value that is classified as a number sequence, and premature firings, which is allowed when the value of temperature increase ΔT, based on the pmax at the time of premature ignition, in accordance with the stock temperature to achieve a predetermined allowable temperature of the piston Tmax, to ensure the strength of the piston. The amount of temperature increase ΔT becomes higher if pmax during the premature ignition of the above, and therefore, under the same condition is valid for the number n sequence, and premature firings becomes smaller, since pmax during the premature ignition of the above. For this reason, as shown in Fig.7, the allowable number n of successively occurring premature firings becomes more if pmax during the premature ignition below.

[0031]

[A specific example of the first embodiment of the invention]

Thus�time to successfully conduct the temperature control of the piston 12 in the case of suppression sequence, and premature firings without the need for special measures, such as the growing strength of the piston, it is desirable to achieve a good balance between prevention of temperature increase of the piston T so as not to exceed the allowable temperature Tmax of the piston as a result consistently emerged premature firings, and the prevention of deterioration of the different operating parameters (the above-mentioned exhaust emission, ensure drivability, etc.) of the internal combustion engine 10 as a result of executing the control of the sequential suppression of the occurrence of premature igniting.

[0032]

Thus, in the present embodiment, when the successive occurrence of premature firings detected during operation of the internal combustion engine 10, the rate of temperature increase of the piston due to the occurrence of premature ignition is measured based on the works of the magnitude of temperature increase ΔT of the piston 12 and the number of occurrences of premature firings, which are installed as shown in the above Fig.5. In addition, the office mini�of successive occurrences of premature ignition is done then, when the temperature T of the piston calculated at the above rate of temperature increase of the piston has reached the maximum permissible temperature of the piston Tmax.

[0033]

Fig.8 provides a block diagram representing the sequence of management actions performed by the ECU 32 to hold the office in accordance with the first variant implementation of the present invention. It is assumed that this sequence of actions is performed in parallel for each cylinder in each cycle of the internal combustion engine 10.

In the workflow shown in Fig.8, first the definition of premature ignition based on whether the pressure P inside the cylinder, measured using a pressure sensor inside the cylinder 34, higher than the maximum pressure inside the cylinder Rmax under normal combustion (step 100).

[0034]

If the result at step 100 is established that premature ignition occurred in the current cycle, it counts the number of consecutive arisen premature firings (step 102). Next, it is determined whether the premature ignition part in this cycle consistently emerged premature firings (step 104). In particular, determine, is whether the number of the last�thus arisen premature firings, at least two cases.

[0035]

If step 104 is established that there is a consistent appearance of premature firings, pmax is calculated during the premature ignition for each sequence, and premature firings (step 106). Then we can calculate the temperature T of the piston (step 108). In particular, the ECU 32 stores the value of ΔT is the rate of temperature increase, which is set to increase with the increase in pmax during premature ignition. At this step 108, the magnitude of temperature increase of the piston due to the occurrence of current consecutive premature firings is calculated as a value obtained by calculating and summing each work value of temperature increase ΔT corresponding to pmax during the premature ignition, the number of cases of premature ignition for each successively encountered premature ignition. In a situation when, for example, there have been three consistently emerged premature ignition, if pmax during the first premature ignition was 6 MPa, and the amount of temperature increase ΔT is 5°C on the incidence of premature ignition, if pmax during the second �restaurantname ignition was 4 MPa, and the corresponding ΔT of temperature increase is 4°C on the incidence of premature ignition, and if pmax during the third premature ignition again is 6 MP, the amount of temperature increase of the piston is calculated as 14°C, which is the sum of values obtained by multiplying the value by 5°C on the number of these cases, premature ignition, i.e. 2, and the values obtained by multiplying values of 4°C in the number of these cases, premature ignition, i.e. 1. Then, the temperature of the piston T (estimated value) is calculated by adding the calculated values of temperature increase of the piston and the design temperature of the piston (the value pre-stored in the ECU 32) for the current working area (which is characterized by torque and engine speed).

[0036]

Next, it is determined whether the temperature T of the piston, calculated in step 108 is greater than or equal to the allowable temperature Tmax of the piston (step 110). As a result, if the temperature T of the piston has reached the permissible temperature Tmax of the piston or exceeded it due to the development sequence, and premature firings, it is the management of the sequential suppression of the occurrence of premature firings (for example, enrichment of the air we�tidal mix) (step 112).

[0037]

If, on the other hand, in step 100 it is established that premature ignition did not occur in the current cycle, then reset the number of consistently encountered premature firings (step 114). Is then determined, continues the management of the sequential suppression of the occurrence of premature firings (step 116). As a result, if at this stage 116 premature ignition is not detected during execution of control of sequential suppression of the occurrence of premature ignition, the control of the sequential suppression of the occurrence of premature firings is suspended (step 118).

[0038]

In accordance with the sequence shown in Fig.8 and described above, the temperature T of the piston during the sequential occurrence of premature firings is calculated based on the works of the magnitude of the rate of temperature increase ΔT of the piston 12, which is set in such a way as to have a different meaning depending on the value of pmax at the time of premature ignition and the incidence of premature ignition. Then, controlling the sequential suppression of the occurrence of premature firings to the estimated temperature T of the piston does not exceed the supplementary�reversible temperature piston Tmax. There is an inverse relationship between the pressure P inside the cylinder during the occurrence of premature ignition and the incidence of premature ignition. In addition, as has been described with reference to the above Fig.5, we can say that even if premature ignition occurs with high frequency, the temperature of the piston is unlikely to increase if pmax during the premature ignition is low compared with the case where it is high.

[0039]

According to the procedure described above the sequence of actions by the magnitude of temperature increase is set to a lower value in case of premature ignition occurs consistently in a situation in which the pmax at the time of premature ignition is low compared with the case where the premature ignition occurs consistently in a situation in which the pmax at the time of premature ignition is high. As a result, the number of successively occurring premature firings that are permissible before you manage your suppression of premature ignition, becomes larger in the case when pmax during the premature ignition is low compared with the case where it �is high. In other words, upon detection of consistently emerged premature igniting of the above-mentioned order of the sequence of actions can hinder the performance of the control by suppression of successive occurrences of premature firings, when pmax during the premature ignition is low compared with when pmax during the premature ignition is high.

[0040]

Therefore, control of the sequential suppression of the occurrence of premature firings begins earlier, when the value of pmax at the time of premature ignition is high than when it is low, whereby an excessive increase in the temperature T of the piston can be prevented. In addition, the deterioration of the different operational characteristics (such as, exhaust emissions) of the internal combustion engine 10 can be prevented as a result of frequent management sequential suppression of the occurrence of premature firings during the sequence, and premature firings, when pmax during the premature ignition is low (more specifically, in a situation in which the incidence of premature ignition is higher than in a situation where pmax while still�vremennogo ignition high).

[0041]

In addition, the corresponding values of pmax during the premature ignition when there are consecutive premature ignition, is not always equal to each other. In accordance with the above sequence of steps, the rate of temperature increase is calculated using the value of temperature increase ΔT, which corresponds to pmax during the premature ignition, and the frequency of occurrence of each premature ignition in the sequence occur premature firings, the temperature T of the piston based on the calculated rate of temperature increase is compared with the allowable temperature Tmax of the piston. Thus, it is possible to accurately control the temperature T of the piston.

[0042]

It should be noted that in the first embodiment, as described above, the ECU 32 receives the value of the pressure inside the cylinder R, using the pressure sensor 34, "device for measuring the pressure inside the cylinder thereby is implemented in accordance with the first aspect of the present invention; unit ECU 32 produces the above-mentioned step 100, resulting in implementing the "device detect abnormal combustion according to the first aspect of the present invention; unit ECU 32 performs a number of steps 102 to 112, in RES�ltate what is implemented "device adjustment control suppressing abnormal combustion according to the first aspect of the present invention. In addition, the office of the sequential suppression of the occurrence of premature ignition corresponds to the suppression of abnormal combustion according to the first aspect of the present invention.

In addition, in the first embodiment described above, the ECU 32 produces the above-mentioned step 108, resulting in a realized "the unit of calculation of the rate of increase in temperature of the piston according to the second aspect of the present invention.

[0043]

The second variant of the invention.

Next, the second embodiment of the present invention will be described using Figures 9 through 11.

The system according to this embodiment of the invention can be implemented using the hardware configuration shown in Fig.1, and inducing the ECU 32 to perform the sequence of actions shown in Fig.10 and 11, described below, instead of the sequence of actions shown in Fig.8.

[0044]

In the first embodiment described above, when the sequential occurrence of premature ignition is detected during operation of the internal combustion engine 10, the temperature of the piston T is calculated, taking into account the magnitude of temperature increase of the piston based on the produced�of the rate of temperature increase ΔT of the piston 12 and the number of occurrence of premature firings. In addition, when the calculated temperature of the piston T has reached the permissible temperature of the piston Tmax, managed, sequential suppression of the occurrence of premature ignition.

[0045]

[A specific example of the second variant of the invention]

In contrast, in accordance with the present variant embodiment of the invention, upon detection of successive occurrences of premature ignition of the ease of operation of the sequential suppression of the occurrence of premature ignition is ensured in accordance with the value of pmax during the premature ignition using the following method.

[0046]

In particular, in the present embodiment, the ratio between the permissible number n of successively occurring premature firings, as shown in the aforementioned Fig.7, and the pressure pmax during the premature ignition is determined for each predetermined operating point (which is determined by the torque (load) and engine speed) in the area of premature ignition, shown in Fig.3. In addition, the maximum number n sequence, and premature firings for each operating point is chosen to be large, in thatduring as pmax during the premature ignition is lower.

[0047]

In addition, in the present embodiment, when the detected sequential appearance of premature firings, management of sequential suppression of the occurrence of premature ignition is performed under the condition that the number of occurrence of premature firings reaches the allowable number n sequence, and premature firings depending on pmax at the time of premature ignition.

[0048]

Fig.9 shows a chart for explaining the expert management of acceptable sequence number n premature firings

In addition, in the present embodiment, the ratio between the permissible number n of successively occurring premature firings and pmax during the premature ignition of the change in accordance with the number (frequency of occurrence) premature firings within a predetermined time period (e.g. one month).

[0049]

In particular, when the frequency of occurrence of premature ignition in a situation in which the pmax at the time of premature ignition is high (e.g., pmax during the premature ignition corresponds Rmax), higher than or equal to the predetermined value A, doPost�my number n sequence, and premature firings (for example, n_3) on the high pmax side Rmax) increases, and the valid sequence number n premature firings (e.g., n_1) on the side of the low pmax (side Rmax) decreases, as shown in Fig.9(A). Conversely, when the frequency of occurrence of premature ignition in a situation in which the pmax at the time of premature ignition is high, below a pre-set value (i.e. less than a preset value (A), the allowable number n of successively occurring premature firings (e.g., n_3) on the high pmax side Rmax) decreases, and the maximum number n sequence, and premature firings (e.g., p) on the side of the low pmax (side Rmax) increases, as shown in Fig.9(B).

[0050]

Fig.10 shows a block diagram representing the sequence of management actions performed by the ECU 32, for carrying out control in accordance with the second variant implementation of the present invention. Fig.10 the same steps as the steps shown in Fig.8 in the first embodiment, are assigned the same reference position, and therefore their description will be omitted or simplified.

In the workflow shown in Fig.10, if at step 100 it is determined that occurred PR�devrekani ignition, the number consistently emerged premature firings is calculated for each predetermined pmax during the premature ignition (for example, Rmax-Rmax, as shown in Fig.9) (step 200). When premature ignition occurs with the maximum pressure pmax within the cylinder, which is intermediate in relation to the submitted Rmax-Rmax, etc., can be calculated the number of occurrences corresponding to the nearest presents pmax, or may be the number of occurrences corresponding to each presented pmax on both sides (for example, Rmax and Rmax), with a predetermined distribution ratio.

[0051]

Further determines whether the number of consecutively encountered premature firings corresponding to any of the above-mentioned predetermined value pmax at the time of premature ignition (for example, Rmax-Rmax), the allowable number n sequence, and premature firings (e.g., n_1-n_3) (step 202). As a result, if such a determination is confirmed, the control is performed by the sequential suppression of the occurrence of premature ignition (for example, enrichment of the air fuel mixture) (step 112).

[0052]

Fig.11 presents a block diagram representing p�the sequence of management actions, performed by the ECU 32, the implementation of the above management expert valid number sequence, and n premature igniting.

In the workflow shown in Fig.11, first determined, does not exceed the incidence of premature ignition of a predetermined high pmax (here, as one example, the premature ignition in the case when pmax during the premature ignition corresponds Rmax shown in Fig.9) higher or equal to the predetermined value A (step 300). The ECU 32 is continuously counts the number of occurrences of the above-mentioned pre-ignition with a high value of pmax within a predetermined time period (e.g. one month) to get the above frequency of occurrence. In step 300 it is evaluated whether the frequency of occurrence, thus obtained, is higher than or equal to the predetermined value A.

[0053]

If such a determination at the above-mentioned step 300 vindicated, against the permissible number n sequence, and premature firings to pmax during the premature ignition adjusted in such a way as to increase the allowable number n sequence of prezhdevremen�x firings (for example, n_3) on the side of high values of pmax (side Rmax) and reduce the allowable number n of successively occurring premature firings (e.g., n_1) on the side of the low values of pmax (side Rmx) (step 302). For example, a valid number sequence, n_3 premature firings corresponding to Rmax on the side of high values of pmax increases, and the permissible number n_1 and n_2 sequence, and premature firings corresponding to Rmax and Rmax on the side of the relatively low pmax decreases, as in the case shown in Fig.9(A).

[0054]

If, on the other hand, such a determination at the above-mentioned step 300 is not confirmed, it is determined whether the frequency of occurrence of the above-mentioned pre-ignition with a predetermined high pmax is lower than a preset value (i.e., less than a pre-set value (A) (step 304). As a result, if such a definition at the current step 304 is not confirmed, i.e., if the frequency of occurrence of the above-mentioned premature ignition with high pmax is a value between the predetermined value and A predetermined value, then the ratio of the allowable number n sequence, and premature firings to pmax during the premature vospalenie�ia not correct.

[0055]

If, on the other hand, such a determination at the above-mentioned step 304 confirmed, the permissible number n sequence, and premature firings to pmax during the premature ignition adjust thus to reduce the allowable number n of successively occurring premature firings (e.g., n_3) on the high pmax side Rmax) and to increase the allowable number n of successively occurring premature firings (e.g., n_1) on the side of the low pmax (side Rmx) (step 306). For example, a valid number sequence, n_3 premature firings corresponding to Rmax on the high pmax, is reduced, and the allowable number n_1 and n_2 sequence, and premature firings corresponding to Rmax and Rmax on the relatively cheap side pmax increases, as in the case shown in Fig.9(B).

[0056]

In accordance with the sequence shown in Fig.10 and described previously, if the sequential occurrence of premature ignition has occurred, the administration of sequential suppression of the occurrence of premature ignition is performed only when the number of successively encountered premature firings at any and� values pmax during the premature ignition has reached the allowable number n sequence, and premature firings, which is set for each predetermined pmax at the time of premature ignition. As already described, the allowable number n of successively occurring premature firings should be mounted in such a way as to increase with a decrease in pmax during the premature ignition (see Fig.7). Therefore, when the sequential occurrence of premature ignition is detected, the above arrangement of the current sequence of actions can hinder the performance of the control by suppression of the sequential occurrence of premature ignition when pmax during the premature ignition is low, unlike when pmax during the premature ignition is high. Even when the sequential occurrence of premature ignition is detected, it makes possible the successful achievement of a good balance between prevention of excessive increase in the temperature T of the piston during the sequential occurrence of premature ignition (especially during sequential occurrence of premature ignition in a situation where pmax during the premature ignition is high) and the prevention of deterioration of the different operating parameters (emissions of exhaust �Azov, etc.) of the internal combustion engine 10 as a result of frequent execution control sequential suppression of the occurrence of premature ignition during successive occurrences of premature ignition with low pmax during the premature ignition, which is the situation when the incidence of premature firings relatively high.

[0057]

Furthermore, according to the sequence of actions shown in Fig.11 and described above, the expert management of acceptable sequence number n premature firings should be made to change any of the valid sequence numbers of premature firings in accordance with the frequency of occurrence of premature ignition during the aforementioned predetermined time period for each predetermined pmax at the time of premature ignition. The present expert control device is especially useful in situations where a calculation is made of the strength of the piston, moreover, that simultaneously takes into account the degree of fatigue of the piston 12 is accumulated due to heat generation from burning during the premature ignition, following the point of view of the so-called rule miner (law of fatigue damage accumulation).

[0058]

In particular, in accordance with the procedure specified above sequence of actions, considering as an example a case where the determination at the above stage 300 is confirmed, the allowable number of successively occurring premature firings (for example, n_3) on the side of high values of pmax (side Rmax) increase, and the valid sequence number n premature firings (e.g., n_1) on the side of the low pmax (side Rmax) reduce, when the frequency of occurrence of premature ignition of a predetermined high pmax (for example, premature ignition with Rmax) is greater than or equal to the predetermined value A. in Other words, limiting the occurrence of premature ignition on the low side pmax is more strict, while on the high pmax limit the occurrence of premature ignition is weakened. This makes it possible to achieve a good balance overall so that accumulated in the piston 12 fatigue does not increase as a result of successive occurrence of premature ignition when that is suppressed by performing the control of sequential suppression of the occurrence of premature ignition in response to the sequential occurrence of premature ignition on the high pmax, even when the sequential occurrence of premature ignition on the high pmax can occur with high probability due to the difference in operating conditions of the internal combustion engine 10 or the difference in the manner �Board the vehicle. Thus, even when it is assumed that will be a consistent occurrence of premature ignition, the durability of the piston can be effectively achieved without an accompanying increase in weight of the piston to increase its strength.

[0059]

In addition, in the case opposite to the above-mentioned (when the determination at the above-mentioned stage 304 confirmed), limiting successive occurrences of premature ignition of the high-side pmax is tightened, thus weaken the limits of the sequential occurrence of premature ignition at the side of the low pmax. This makes it possible to achieve a good balance overall so that accumulated in the piston 12 fatigue does not increase as a result of successive occurrence of premature firings while also suppressed by performing the control of sequential suppression of the occurrence of premature ignition in response to the sequential occurrence of premature firings on the side of the low pmax, even with a strong probability of consecutive premature ignition on the high pmax is small, due to differences in operating conditions of the internal combustion engine 10 or due to the difference in the manner of management Tr�sportgym agent.

[0060]

In particular, under the expert management of a valid sequence number n premature firings according to the second embodiment of the invention, which has been described above, the relation between the permissible number n of successively occurring premature firings and pmax during the premature ignition of the change in accordance with the result obtained by comparing the frequency of occurrence of premature ignition in a situation where pmax during the premature ignition is high (e.g., pmax during the premature ignition of equal Rmax) with predetermined values A and B. However, the present values of the pmax at the time of premature ignition in the evaluation of the frequency of occurrence of premature ignition in this expert management is not limited to these and can, for example, be one of the values on the low side pmax (for example, Rmax).

[0061]

In addition, in the second variant of implementation, which was described above, the relation between the permissible number n of successively occurring premature firings and pmax at the time of premature ignition is considered as representing the proportional dependence of the first order, as shown in this�Oh Fig.7. However, the relationship between allowable number n sequence, and premature firings and a maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion according to the present invention is not limited to that described above. More specifically, it may, for example, be the allowed number of occurrences of abnormal combustion is changed along a curve in accordance with the change of the maximum value of the pressure inside the cylinder, provided that the maximum number of occurrences of abnormal combustion engines used in the case where the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is low, more than the allowed number of occurrences of abnormal combustion engines used in the case where the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is high. Furthermore, the method of adjusting the ratio between valid number sequence, and premature firings and a maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is also not limited to the above. More specifically, when the frequency of occurrence of abnormal combustion is obtained for each Maxim�form of further pressures within the cylinder against at least two maximum values of pressure inside the cylinder during operation of the internal combustion engine, the maximum number of occurrences of abnormal combustion for selected maximum pressure inside the cylinder can be increased (or decreased), while the number of cases of occurrence of abnormal combustion for another, at least one maximum value of the pressure inside the cylinder can be reduced (or increased) in the case where the frequency of occurrence of abnormal combustion at a maximum pressure value in the cylinder above or equal to (or below) the predetermined value.

[0062]

It should be noted that in the second embodiment, as described above, the ECU 32 performs a series of the aforementioned operations in the steps 200, 202 and 112, in accordance with which the control device suppressing abnormal combustion" is implemented in accordance with the first aspect of the present invention.

In addition, in the above-described second embodiment Rmax corresponds to a particular maximum value of the pressure within the cylinder in accordance with the fourth or fifth aspect of the present invention, wherein Rmax and Rmax correspond "to another, at least one maximum value of the pressure within the cylinder in accordance with the fourth or fifth aspect of the present invention. In addition, the ECU 32 performs the above�e action in step 302, when the determination at the above-mentioned step 300 is confirmed, in accordance with what "the first device changes the allowable number of occurrence of abnormal combustion is implemented in accordance with the fourth aspect of the present invention; and the ECU 32 performs the above action in step 306, when the determination at the above-mentioned step 304 confirmed, in accordance with the "second device changes the allowable number of occurrence of abnormal combustion is implemented in accordance with the fifth aspect of the present invention.

[0063]

In particular, in the above-described first and second embodiments, it was the description applied to the management applied in the case when there is a consistent appearance of premature ignition. However, also in the case when a premature ignition, with a frequency higher than or equal to the predetermined value, has occurred within a predetermined time period (predetermined cycles (e.g., the case where premature firings occurred one after another, and then the premature ignition occurs again after one normal combustion), the temperature of the piston 12 is similarly incremented due to the occurrence of premature ignition, even if it is� is the case, when sequential appearance of premature firings occurred during the set of cycles in the same cylinder. Therefore, in the present description, the case when the detected premature ignition frequency, as described above, is considered as the case when found in practically consistent abnormal combustion, and requires management according to the present invention.

[0064]

In addition, in the first and second embodiments described above, measure the pressure P inside the cylinder using the output value of the sensor 34, identify premature ignition based on the value of the pressure P inside the cylinder and calculate the pmax at the time of premature ignition. However, the use of devices to measure pressure inside the cylinder, according to the present invention is not restricted to the use specified above, the sensor 34 pressure inside the cylinder; such a device may also be a device that calculates a correlated value of the pressure inside the cylinder or predicts the pressure inside the cylinder using a pre-configured sensor. More specifically, for example, the pressure inside the cylinder can be determined using a sensor that detects vibration, p�izvodimy internal combustion engine during combustion.

NOTATION

[0065]

10 internal combustion engine

12 piston

14 combustion chamber

16 inlet channel

18 is an exhaust channel

20 gauge air flow

22 turbocharger

24 butterfly valve

26 injector for fuel injection

28 spark plug

32 ECU (electronic control unit)

34 pressure sensor inside the cylinder

36 sensor crank angle.

1. A control device for an internal combustion engine, containing:
the device measuring the pressure inside the cylinder for measuring the pressure inside the cylinder of the internal combustion engine;
device detection of abnormal combustion for detecting the presence or absence of abnormal combustion based on the value of pressure inside the cylinder, measured using the device for measuring the pressure inside the cylinder; and
the adjustment device management suppressing abnormal combustion in order, when the detected consecutive or almost consecutive occurrence of abnormal combustion, to increase the allowable number of successively occurring premature firings, which is valid before attempting to control the suppression of abnormal combustion, which suppresses abnormal combustion when the maximum value of the pressure inside the cylinder �about the time of occurrence of abnormal combustion is low, compared with when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is high.

2. A control device for an internal combustion engine according to claim 1,
in which the adjustment device management suppressing abnormal combustion device includes estimates of the rate of temperature increase of the piston to assess the rate of temperature increase of the piston due to the occurrence of abnormal combustion on the basis of the product of the rate of temperature increase of the piston, which is set to increase with the increase of the maximum pressure inside the cylinder at the time of occurrence of abnormal combustion, the number of cases of occurrence of abnormal combustion, and
in which upon detection of consecutive or nearly consecutive occurrence of abnormal combustion control device suppressing abnormal combustion executes the suppression control of abnormal combustion such that the temperature of the piston, calculated on the basis of the rate of temperature rise of the piston, evaluated by the evaluation device of the rate of temperature rise of the piston, becomes lower than a predetermined allowable temperature.

3. A control device for an internal combustion engine according to claim 1,
in which device correcter�incident management suppressing abnormal combustion performs the control of suppressing abnormal combustion in the case, when the number of cases of occurrence of abnormal combustion is detected, consecutive or almost consecutive occurrence of the abnormal combustion has reached it maximum number of allowable occurrences of abnormal combustion,
in which the number of occurrences of abnormal combustion varies depending on the maximum pressure inside the cylinder at the time of occurrence of abnormal combustion
when the valid number of cases of occurrence of abnormal combustion, which is used when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is low, exceeds the number of cases of occurrence of abnormal combustion, which is used when the maximum value of the pressure inside the cylinder at the time of occurrence of abnormal combustion is high.

4. A control device for an internal combustion engine according to claim 3, which further comprises the first device changes the allowed number of occurrences of abnormal combustion in order, when the frequency of occurrence of abnormal combustion is obtained for each of the maximum value of the pressure inside the cylinder in relation to at least two maximum values of the pressure inside the cylinder during the work� of the internal combustion engine, to increase the allowable number of occurrences of abnormal combustion for selected maximum pressure inside the cylinder and thus reduce the number of cases of occurrence of abnormal combustion for another, at least one maximum value of the pressure inside the cylinder in the case where the frequency of occurrence of abnormal combustion at the same time separate the maximum value of the pressure inside the cylinder is higher than or equal to the first predetermined value.

5. A control device for an internal combustion engine according to claim 3 or 4, which further comprises a second device changes the allowed number of occurrences of abnormal combustion in order, when the frequency of occurrence of abnormal combustion is obtained for each of the maximum value of the pressure inside the cylinder in relation to at least two maximum values of the pressure inside the cylinder during operation of the internal combustion engine, to reduce the number of cases of occurrence of abnormal combustion for selected maximum pressure inside the cylinder and thus to increase the allowable number of occurrences of abnormal combustion for the other, at least one maximum value of the pressure inside the cylinder in the case, when the frequency of occurrence of anomaliesare the individual maximum value of the pressure inside the cylinder below the second pre-determined value.



 

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36 cl, 12 dwg

FIELD: engines and pumps.

SUBSTANCE: invention can be used in automotive vehicles equipped with ICEs. ICE device comprises vehicle motion external conditions detection unit, vehicle speed computation unit, target output characteristic setting unit and output characteristic variation unit. Said vehicle motion external conditions detection unit can detect vehicle external on-rod motion conditions. Said vehicle speed computation unit computes vehicle speed under detected motion external conditions. Said target output characteristic setting unit can decrease ICE output parameter corresponding to accelerator position variation as vehicle speed difference between recommended vehicle speed and a actual speed. Besides, it can set target ICE output characteristic acceptable for constant motion at recommended vehicle speed when difference between recommended speed and actual speed equals zero. Said output characteristic variation unit can vary ICE output characteristic to target output characteristic. Invention discloses the ICE output characteristic control device implementation.

EFFECT: normal fuel consumption irrespective of different driving techniques.

13 cl, 25 dwg

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