Device to reveal ignition plug fault

FIELD: engines and pumps.

SUBSTANCE: invention relates to automotive industry. Proposed device comprises preliminary determination section, confirmation section and modification section. Ignition plug (8) is supplied by storage battery (7) in ignition period and charged by power generated by AC generator (12). Preliminary determination section defines probability of faulty operation of ignition plug proceeding from variation in AC generator output power at termination of ignition period. Probability of ignition plug fault will be determined if variation in AC generator output does not exceed check value. The latter represents a set of values intended for revealing faulty conditions of operation of ignition plug. In determining the section fault probability, confirmation section is temporarily cuts in ignition plug (8) at the end of ignition period. If AC generator output power does not exceed preset limits, generator output power variation is compared with check values "a", given ignition plug (8) is connected. If variation of generator output power does not exceed check value, ignition plug fault is considered confirmed. Proceeding from detection of faulty operation of ignition plug, modification section increases top limit of appropriate range. Confirmation section can determine check values of output power variation directly at the start of ignition plug connection or after it. Connection is considered available, if AC generator outputs sufficient power. Modified top limit represents maximum possible power output of AC generator (12).

EFFECT: valid detection of spark plug faults.

5 cl, 5 dwg

 

The technical field

The present invention relates to a device for diagnosing disorders of the mode of operation of the spark plugs of the internal combustion engine.

The level of technology

In vehicles, such as cars with internal combustion engine, during starting of the engine included various kinds of electric equipment. Initially, the starter cranks the engine. During cranking of the engine the fuel is injected into the combustion chamber of the engine. When the engine start is completed, the motor starts to work offline. As soon as it starts to work offline, the drive of the starter motor stops.

As internal combustion engines in vehicles are used, for example, internal combustion engines with compression ignition, including diesel engines. In these engines to improve the mode of ignition and improving the combustion of fuel during the specified period from start to finish run the engine in the combustion chamber has a spark of the candle. Igniting the candle provides heating when connected to power supply from the battery. Firing the spark plugs at the time of ignition, i.e. a specified time from start to finish starting the engine.

In the operation of the spark plugs happen violation mode, voltage is emer extended connection candles or disconnected spark. With this purpose, according to the publication laid patent application of Japan No. 2002-115641 (hereinafter, Document 1) rechargeable battery charges corresponding to a charged state of the energy produced by the alternator. Thus, when the spark plugs changed between the enable state and a deenergized condition, the existence of a breach of the mode of operation of the spark plugs is determined by the change in the output power of the alternator. In the case of the extended connection candles or interrupting the connection candles change the output power of the alternator is small. Thus, if it is determined that the change is not more than the control value, can be determined and the existence of a breach of the mode of operation of a spark-plug. The reference value is a value set to determine whether violations of the mode of operation of a spark-plug. More specifically, if the change is the reference value or less, it is determined that the malfunction of the firing of the spark occurred.

As stated above, it is desirable that the existence of a breach of the mode of operation of the spark plugs was determined on the basis of the fact that the power output of the alternator is in the respective predetermined limits. This is because the definition of violations the ia mode the spark plugs cannot be performed accurately, when the output power of the alternator itself deviates from the norm. The appropriate range, for example, this is the range from the lower limit And the upper limit B, and the lower limit is A value that is greater than the minimum value of the output power of the AC generator to a predetermined value, and the upper limit is a value that is smaller than the maximum output power by a specified amount.

As for changing the mode of operation of a spark-plug between an enabled state and a deenergized state to determine violations of the mode of operation of the spark plugs, changing the mode of operation of a spark-plug from the on state to the de-energized state occurs when the ignition period ends after the completion of the engine start after the engine begins to work offline), and preferably is used. This is because the engine operates autonomously, for example, in the idle mode when the ignition period ends and the connection of various kinds of electrical equipment remains the same, what differs from the time of starting the engine when the output power of the alternator is maintained almost constant.

As for changing the output power of the AC generator that is a, then when the spark plugs are changed from the on state to the de-energized state, the reaction of the spark plugs and the level changes are smaller than in the case when the spark plugs changed from the de-energized state to the enabled state. The reason for this is as follows. When the spark plugs changed from the de-energized state to the on state, for cold in the deenergized condition of the spark plugs require a large electromotive force to bring it to an on state, which change becomes greater than in the case when the spark plugs changed from the de-energized state to the on state, respectively. Therefore, if a malfunction of the firing of the spark is determined only on the basis of the magnitude of the change in the output power of the alternator, when the spark plugs are changed from the on state to the de-energized state, such determination may not be accurate.

In connection with this problem, if it is determined that there is a malfunction spark-plug, on the assumption that the change in output power of the alternator, in accordance with the mode change the spark plugs from the on state to the de-energized state, not more control mn the treatment immediately after the end of the firing period, determining that there is a malfunction spark-plug is not supported directly, but is determined that there is a possibility of violation of the mode of operation of a spark-plug. Then, on the basis of this definition, a violation of the mode of operation of the spark plugs can be identified again. More specifically, after the end of the firing period of the firing of the spark plugs temporarily. It then determines whether exceeds the change in the output power of the alternator during the connection of the control value. If the determination is confirmed, is that the malfunction of the firing of the spark occurred. Thus, confirms the violation mode. This re-determination of violations of the mode of operation of a spark-plug improves the accuracy of the previous determination that the violation mode the spark plugs available. This process of re-determination is performed under the condition that the output power of the alternator is within a predetermined appropriate range.

However, in the case where the quality of the battery deteriorates, the output power of the alternator tends to increase, and it may happen that the output power exceeds the upper limit of the appropriate range, produced when the connection goes the spark plugs, even if the output power is in the appropriate limits in time when the ignition period ends, which re-detect violations of the mode of operation of the spark plugs may be unsuccessful. In particular, in the case when the output power of the alternator is near the upper limit of the appropriate range at the time when the ignition period ends, it is very likely that the output power exceeds the upper limit of the appropriate range when connecting the spark plugs. The reason for this is that when the spark plugs changed from the de-energized state to the on state, to bring in the enabled condition of the spark plugs, cold in de-energized condition, requires a large electromotive force, which increases the power output of the AC generator.

As indicated above, re-detect violations of the mode of operation of a spark-plug fails, if the output power of the alternator exceeds the upper limit of the specified range, when the firing candle temporarily connected to complete the re-definition. Due to the fact that the determination of probable violations of the mode of operation of the spark plugs may be the implementation is about, but may not be re-detect violations of the mode of operation of a spark-plug, detect violations of the mode of operation can be performed even when the violation mode the spark plugs actually occurred.

The invention

The present invention is to create a device for diagnosing disorders of the mode of operation of a spark-plug, which prevents a failure in determining violations mode candles due to deterioration of the battery, while actually happening violation mode.

To solve the above problems in accordance with the present invention a device for the diagnosis of disorders of the mode of operation of the spark plugs of the internal combustion engine. On the spark-plug is energized from the battery during the pilot period from the beginning to the completion of the engine start. Rechargeable battery charges charged to the appropriate state from the alternator. The device comprises a section of the preliminary determination to determine probable violation mode, the partition confirmation in order to confirm that the malfunction of the firing of the spark occurred, and section modified. Based on the fact that the power output of the generators is ora alternating current is within a predetermined appropriate range, section preliminary determination determines whether the change in the output power of the alternator more reference values, when the spark plugs are changed from the on state to the de-energized state at the end of the firing period. The reference value is a value set to determine whether violations of the mode of operation of a spark-plug. It is based on the fact that the change in the output power of the alternator is not more than the control values. Section preliminary determination determines whether there is a likelihood of breach of the mode of operation of a spark-plug. When the section of the preliminary determination determines that the probability of violation of the mode of operation of a spark-plug has a section confirmation act to include spark-plug temporarily after the end of the firing period. Based on the fact that the power output of the alternator is within proper limits, section confirm determines whether the change in the output power of the alternator more than the control values at the time of connecting the spark plugs. Based on the fact that the change in the output power of the alternator is not more than the control values section confirm determines that the malfunction of the firing of the spark occurred. Based on what section of the preliminary determination determines that there is a possibility of violation of the mode of operation of a spark-plug, the section modification modifies the upper limit of the appropriate range to a larger value.

In determining whether violations of the mode of operation of the spark plugs in section confirm the appropriate range is modified so that the upper limit of the appropriate range has been increased. However, this does not create problems. The reason is the following. As a necessary pre-conditions to determine possible violations of the mode of operation of a spark-plug in section of the preliminary determination, the condition that the output power of the alternator is in the appropriate limits to the modifications already satisfied. Thus, even if the power output edf (output power when forming the electric discharge) of the alternator tends to increase at the beginning of the connection, the spark plugs, when the existence of a breach of the mode of operation defined in section confirm that the probability that the output power of the alternator will assume great importance is negligible.

Brief description of drawings

Figure 1 - diagram of the engine to which is applied one who Ariant implementation diagnosing device violations mode of operation;

figure 2 - timing diagram illustrating an example of (a) connect the spark plugs, (b) changing the output power of the alternator and (c) install sign the preliminary determination of the violation mode, while diagnosing disorders of the mode of operation of a spark-plug;

figure 3 - block diagram of the sequence of operations illustrating a procedure for determining whether there is a likelihood of breach of the mode of operation of a spark-plug;

4 is a block diagram of a sequence of operations illustrating the procedure of determining the existence of violations of the mode of operation of a spark-plug;

5 is a block diagram of a sequence of operations illustrating a procedure for determining violations of the mode of operation of the spark plugs.

The best embodiment of the invention

Below, with reference to figures 1 to 5 described embodiment in accordance with the present invention applied to a diesel engine.

As shown in figure 1, in the engine 1, the fuel is injected from the injector 2 into the chamber 3 of the combustion chamber for ignition. This causes the piston to make a reciprocating motion so that when it rotates the crankshaft 5. Starter 6 and the generator 12 of alternating current connected to the crankshaft 5. The starter 6 is forcibly rotate (crank) crank shaft 5 during startup of the engine 1. The generator 12 PE the temporal power operates during rotation of the crankshaft 5, producing electricity for charging the battery 7.

When the engine 1 is started, the starter motor 6 is driven by power of the battery 7 to crank the engine 1. During cranking, the fuel injected into the combustion chamber 3, thereby ensuring the operation of the engine 1. Igniting the candle 8 is located in the combustion chamber 3 of the engine 1 to improve ignition and combustion conditions of the fuel in the combustion chamber 3 during a predetermined period from the start of the engine until the completion of startup of the engine (hereinafter referred to as pilot period). Igniting the candle 8 creates a high temperature when it is connected to the power supplied from the battery 7.

The generator 12 AC includes a voltage regulator to adjust the output power and the voltage regulator controls the mode based on the command value mode to generate the output power of the edf, the corresponding command value mode. Command mode value is set as a variable to maintain the battery 7 in respectively charged state based on the battery voltage. In particular, command value mode increases with decreasing battery voltage. Thus, the power output edf generators is Torah 12 AC low when igniting the candle 8 is de-energized, and the power output edf great when igniting the candle 8 is connected.

In a vehicle equipped with the engine 1, the electronic control unit (ECU) 9 is provided to control the operation of the engine 1 or the movement of the vehicle. The electronic control unit 9 includes a CPU for performing various operations related to the management of run controls various types of electronic equipment, a ROM for storing programs or data necessary for management tools, RAM for temporarily storing computation results of the CPU and ports I/o for sending or receiving signals from the outside or on the outer side.

Various sensors, such as sensor 10, the temperature of the water and the sensor 13 of the rotation speed and the ignition switch 11 are connected to input ports of the electronic control unit 9. The sensor 10 water temperature register the temperature of cooling water for the engine 1. The sensor 13 speed registers the rotation speed of the engine. The ignition switch 11 is switched by the driver of the car in any of four positions: "Off", "Advanced", "On" "Start", to output the signal corresponding to the current position of these provisions. Drive circuit for an injector 2, the starter motor 6, the ignition candle 8 and generate the R 12 AC are connected with the output ports of the electronic control unit 9.

The electronic control unit 9 outputs command signals to the drive circuits for the equipment connected to output ports based on the motion state of the vehicle, condition of various kinds of equipment of the vehicle and the operational state of the engine 1, which are obtained from the reception signals transmitted from the above-mentioned sensors. Thus, the electronic control unit 9 implements various controls such as control of fuel injection by the injector 2, the motion control starter 6 during engine start, the control connection of the spark plugs 8 and the output power of the generator 12 AC.

Further, we consider the above-mentioned various control means for starting the engine 1.

When the ignition switch 11 is switched by the driver from position "Off" in the "Advanced" and "On" in turn, while the engine 1 is stopped, connect various types of electronic equipment in the vehicle, such as an electronic control unit 9. Then, when the ignition switch 11 is switched from "On" to "Start", the starter 6 is supplied from the battery 7, is driven to the initial cranking of the engine 1. During cranking, the fuel injection from the injector 2 into the combustion chamber 3 starts DV the engine 1. After starting the engine 1 is completed, and the engine 1 starts to operate the ignition switch 11 is switched by the driver from the "Start" to "on". Then power the starter motor 6 is turned off to stop the movement of the starter motor 6, respectively.

Figure 2(a) shows the connection of a spark-plug 8 immediately after engine start. When the ignition switch 11 is enabled to "on" to start the engine 1, the duration of the firing period is determined based on the temperature of the cooling water for the engine 1 at this point. The firing period is a period from the start of the engine 1 until the completion of the engine start, when the firing candle 8 is connected to improve the parameters of the ignition and combustion characteristics of the fuel in the combustion chamber 3. The duration of the firing period is set larger when the temperature of cooling water is reduced. Igniting the candle 8 is connected after starting the engine 1 at a time, until the firing period. Then igniting the candle 8 is switched from the on condition in the de-energized state at the end of the pilot period (T1after starting the engine 1 is completed.

Figure 2(b) shows the variation in the power output edf generator 12 AC immediately after engine start. As indicated above, the generator beremennaja current is controlled based on the command value mode, which is set as a variable depending on the battery voltage to produce the output power of the edf, the corresponding command value mode. Command mode value is set as a variable within the range from the minimum value of 0% to a maximum of 100%. Accordingly, the output power of the edf, which corresponds to the command value mode, can also be represented by a variable within the appropriate range from the minimum value of 0% to a maximum of 100%. The power output edf is small, when the firing candle 8 is de-energized, since the decrease of the battery voltage is less, and at the same time, the power output edf great when igniting the candle 8 is connected as a voltage reduction of the battery is large. Accordingly, the transition of a spark-plug 8 from the enabled state to the de-energized condition leads to a significant change in the power output edf. When starting the engine power output edf is greatly increased in accordance with the transition of a spark-plug 8 from the de-energized state to an on state. Then at the end (T1) the firing period of the power output edf is significantly reduced in accordance with the transition of a spark-plug 8 from the enabled state to abestos the TES condition.

Next, figure 2 shows the General scheme of diagnosing disorders of the operation mode to determine whether violations of the mode of operation of a spark-plug 8.

Determining whether violations of the mode of operation is based on changes Δedf power output edf generator 12 AC, when the mode spark-plug 8 is changed between on-state and de-energized state. For example, if there are violations of the regime in the form of an extended connection candles or interrupting the connection candles, change Δedf is small. Thus, the existence of a breach of the operating mode may be determined on the basis of that, no more than if the change Δedf reference value "a", and the reference value is a value set to determine whether violations of the mode of operation of a spark-plug 8. More specifically, if the change Δedf is the reference value "a" or less, it is determined that the violation occurred on the mode of operation of a spark-plug 8.

As for the spark plugs 8 from the enabled state to the de-energized state to determine whether the spark plugs 8, then use the move spark-plug 8 from the on condition in the de-energized state at the end of the firing period. The reason for this is that the engine is offline, for example, in idle the m mode, when the ignition period ends, and the connection of various kinds of electrical equipment remains unchanged, unlike the moment of engine start. Thus, it is unlikely that the power output edf alternator will be unstable. It is preferable in determining whether violations of the mode of operation of a spark-plug 8 on the basis of changes Δedf.

The conditions for determining the existence of violations of the mode of operation of a spark-plug 8 include the following conditions (1)-(8). When all conditions are satisfied, Pets execution determine whether violations of the operation.

(1) the battery Voltage has a valid level or above.

(2) the engine Speed is within the specified range near the idling rotation speed.

(3) the Change of rotation speed of the engine a little.

(4) After starting the engine passed a specified period, and the specified period is a period that exceeds the period required to start the engine until the engine begins to work offline.

(5) the power output edf alternator is within the appropriate range.

(6) External equipment fueled by rechargeable batteries that do not work.

(7) the water temperature Sensor is operating normally, and the temperature of ohlord is the fact that water is sufficiently low, to allow connection of a spark-plug 8 at the time of the firing period.

(8) the ignition Switch is in position "On".

Among the above conditions, the condition (5) is a condition of preventing failure in accurate detection of violations of the mode of operation of a spark-plug 8 in a situation of abnormal power output edf generator 12 AC. As the appropriate range in the condition (5) is used, the range from the lower limit to a value greater than the minimum output power of the edf to the preset value (for example, 20% greater than the minimum value)to the upper limit B or to the value, the smaller the maximum value of the output power of the edf to the preset value (for example, 90% of the maximum value).

In the situation when all the above conditions (1)-(8) are satisfied, the ignition candle 8 is switched from the on state to the de-energized state at the end of the firing period. Then detect violations of the mode of operation of a spark-plug 8 is performed as specified.

For a change of the edf power output of the generator 12 AC it should be noted that when the firing candle 8 goes from the on state in the de-energized state, the reaction of the spark-plug 8 and the magnitude of the change Δedf okazyvaets is smaller than when firing candle 8 moves from the de-energized state to an on state. The reason for this is as follows. When igniting the candle 8 moves from the de-energized state to an on state, requires a large electromotive force to bring cold in the deenergized condition of the spark plugs 8 in the enabled state, which change Δedf, respectively, becomes greater than when the firing candle 8 moves from the de-energized state to an on state. Therefore, if the existence of a breach of the mode of operation of a spark-plug 8 is defined on the basis of the magnitude of the changes Δedf output power at the end of the pilot period only, such determination may be inaccurate.

In this sense, if the malfunction spark-plug 8 is based on the fact that the magnitude of the change Δedf does not exceed the reference value "a" in the moment directly after the end of the firing period, determining that the malfunction has not confirmed directly, but is determined that there is a possibility of violation of the mode of operation of a spark-plug 8 (T2). Then, on the basis of this definition the existence of a breach of the mode of operation of a spark-plug 8 is determined again, if all the conditions (1)-(8) are satisfied. More specifically, after the ass the config period has passed after the end of the firing period, igniting the candle 8 is connected temporarily. Then is determined not to do more of the control value "a" change Δedf power output of the generator 12 AC during the connection. After the start of the connection (after time T3and at that time, when it is determined that the change Δedf not more than the control values (T4), it is determined that the malfunction spark-plug 8 has occurred, and the violation mode is confirmed. It re-detect violations of the mode of operation of a spark-plug 8 improves the accuracy of the previous determination that the violation of the mode of operation of a spark-plug feature.

Meanwhile, the battery pack 7 is getting worse with time, and the voltage of such aggravated battery 7 has a tendency to decrease. Thus, the output power of the edf generator 12 AC tends to increase due to deterioration of the battery 7. In this case, it is possible that the power output edf exceeds the upper limit of the appropriate range, when it starts connecting the spark plugs 8, even if the power output edf was in the appropriate limits at the time when the ignition period ends. That is, since the above-mentioned condition (5) is not satisfied, re-detect broken the I mode of operation of a spark-plug 8 may be unsuccessful. In particular, as shown in figure 2(b), when the output power of the edf is close to the upper limit of the appropriate range at the end of the pilot period (T1), it is highly likely that the power output edf exceeds the upper limit of the proper range, when a temporary connection (T3). The reason for this is that when the firing candle 8 moves from the de-energized state to an on state, requires a large electromotive force to transfer cold in the deenergized condition of the spark plugs 8 in the on state, causing the output power of the edf generator of alternating current, respectively, becomes greater.

As described above, when the firing candle 8 is connected temporarily to determine whether violations of the mode of operation of a spark-plug 8, it is possible that the output power of the edf becomes greater than the upper limit of the appropriate range, which re-detect violations of the mode of operation of a spark-plug 8 may be unsuccessful. That is, when the malfunction spark-plug 8 actually happens, it can be defined as something that has a probability of occurrence of violations of the regime, but confirmation of this can be unfortunate, because re-detect violations of the mode of operation for the individual candles 8 cannot be performed.

In this sense, in this implementation, when it is determined that there is a possibility of violation of the mode of operation of a spark-plug 8, the upper limit of the appropriate range (the range from a to B)used in the condition (5)is increased to the upper limit B', as shown in figure 2(b) by the dotted line, after a time T3to modify the appropriate range. Then igniting the candle 8 is connected temporarily to determine the existence of a breach of the mode of operation of a spark-plug 8. If all the conditions (1)-(8) are satisfied, then determining whether violations of the mode of operation of a spark-plug 8.

In this case, when connecting the spark plugs 8 (after time T3to determine the existence of a breach of the mode of operation of a spark-plug 8, the output power of the edf does not exceed the upper limit B' and, thus, remains in the appropriate range (the range from a to B'), even if the power output edf tends to increase due to the degradation of the battery 7. The result is prevented that the power output edf exceeds the appropriate range, and not the satisfaction of conditions (5)and failure to detect violations of the mode of operation of a spark-plug 8. Thus, failure to detect violations of the mode of operation due to deterioration of the battery is nuclear biological chemical (NBC battery 7 is prevented, when in fact a violation of the mode of operation of a spark-plug 8 occurs.

In determining whether violations of the mode of operation of a spark-plug 8, the upper limit of the appropriate range used in the condition (5)is increased to the upper limit B'. However, this does not lead to a noticeable problem for the following reason. That is a prerequisite to determine whether violations of the mode of operation of a spark-plug 8 is performed after the end of the pilot period (after time T1when the condition (5) is already satisfied, and the output power of the edf should be in the appropriate range (the range from a to B). Accordingly, even if the power output edf has a tendency to increase in the beginning of the connection of a spark-plug 8, the probability that the power output edf will take an unacceptably large value is negligible.

Next, figure 3-5 illustrates the procedural steps of determining the existence of violations of the mode of operation of a spark-plug 8.

Figure 3 shows the block diagram of the sequence of operations in the subroutine to determine, directly after the end of the pilot period that has a chance of breaking the mode of operation of a spark-plug 8. This routine is executed by the electronic control unit 9 in predetermined time intervals in interrupt mode.

In this subroutine the first (S101) is determined, whether or not the current time is the time immediately after the end of the pilot period (immediately after time T1figure 2). If it is the time immediately after the end of the pilot period (S101: YES), it is determined that satisfied all of the conditions (1)to(8), as stated above (S102). The appropriate range used in the condition (5) for this definition is the appropriate range from the lower limit And the upper limit B.

If the determination is positive at step S102, the change Δedf power output edf generator 12 AC is determined when the firing candle 8 goes from the on state (On) in de-energized state (Off.) in accordance with the completion of the pilot period (S103). More specifically, the change Δedf is a value obtained by subtracting the output power of the edf after igniting the candle 8 is disconnected from the output power of the edf just before igniting the candle 8 is disabled. The power output edf after igniting the candle 8 has been disconnected, is the value of the power output edf in the above-mentioned point in time (time T2figure 2), which is the time at which the time required to disconnect power from the spark plugs 8 to p in order to obtain the effect of the power output edf, passed after igniting the candle 8 has been switched from the state of On. in the Off-position.

After this is determined, not over whether the calculated change Δedf reference value "a", and the reference value is a value set to determine whether violations of the mode of operation of a spark-plug 8 (S104). If the determination is negative, it is considered that the ignition spark is working normally (S106). If the determination is positive, then the sign of F the preliminary determination of the violation mode, which is used to determine the probability of violation of the mode of operation of a spark-plug 8, is changed from "0" (no probability of violation mode) to "1" (malfunction likely), as shown after time T2figure 2(c) (S105).

Figs.4 and 5 show a flowchart of the sequence of operations in the subroutine to determine whether violations of the mode of operation of a spark-plug 8 based on determining that at this time there is a possibility of violation of the mode of operation of a spark-plug 8. This routine is executed by the electronic control unit 9 in predetermined time intervals in interrupt mode.

In this subroutine first determines whether the sign of F the preliminary determination of the violation mode mark "1" (the probability of violating the work) or not (S201 figure 4). If the determination is positive, then temporarily performs a series of steps to connect the spark-plug 8 to determine whether violations of the mode of operation of a spark-plug 8 (S202-S207).

In this series of stages, despite the fact that the firing candle 8 de-energized (Off.) (S202: NO), determines whether a specified period or not, because the firing candle 8 was previously disabled in the Off state. (S203). If the determination is positive (S203: YES), it starts connecting the spark plugs 8 (S204). Connect the spark plugs 8 continues despite the fact that past period after the beginning of the connection is within a predetermined set value (S206: YES), and connect the spark plugs 8 stops when the last period becomes longer than the predetermined set value (S206: NO) (S207).

Thus, the connection of a spark-plug 8 is carried out after a predetermined period from the end of the pilot period (from T1to T3figure 2), until the period corresponding to the set value. The set value is a time short enough not to adversely affect the service life of the spark plugs 8, but long enough so that the power output edf was stable after the start of the connection. For example, the set value is one with the second.

As described above, when connecting the spark plugs 8 starts (at T3), the appropriate range used for the condition (5) is modified (S208 figure 5). More specifically, the corresponding range is modified so that the upper limit of the appropriate range is increased to the upper limit B', as shown in dotted lines at a time, coming later point in time T3on fig.2b(b). Thus, the appropriate range is modified so that the appropriate range from a to B' was used as the appropriate range in the condition (5). After this is determined, satisfied or not all the above conditions (1)-(8) (S209). The appropriate range used for the condition (5), which is considered in the above definition, is the range from the lower limit And the upper limit B'.

If the determination in step S209 is positive, the change Δedf power output edf generator 12 AC is calculated when the firing candle 8 passes from the de-energized state (Off.) the connected state (On), associated with the connection of the spark plugs 8 (S210). More specifically, the subtraction output power edf, directly before turning on the spark plugs 8, the power output edf, after disconnecting the spark plugs 8, gives change is Δedf. The output power of the edf at the time at which the time required to supply power to the spark-plug 8, to obtain the effect of the power output edf, passed after the firing candle 8 is switched from the Off state. in the On state, is used as the power output edf after igniting the candle 8 is enabled to on.

After this is determined, not more if the calculated change Δedf control values "and"to determine the existence of a breach of the mode of operation of a spark-plug 8 (S211). If the determination is negative, it is determined that the ignition spark is working normally (S213), whereas if the determination is positive, it is determined that the violation occurred on the mode of operation of a spark-plug 8 (S212). After determining the existence of violations of the mode of operation of a spark-plug 8 (at a later point, relative to the time T4figure 2(c)), the sign of F the preliminary determination of the violation mode is reset to "0" (S214).

After the determination is negative at step S209, the process is repeated after step S201. Therefore, after the pilot period will end when all the conditions (1)-(8) are not satisfied during the first connection of the spark plugs 8 and there is a failure to determine normal or abnormal working of the firing candle 8, the connection of a spark-plug 8 is proizvoditsa again on the steps S202-S207 process figure 4. Connect the spark plugs 8 repeats until then, until you made the determination of violation mode at step S212 or the definition of normal operation at step S213.

The above embodiment provides the following effects.

First, based on determining that there is a possibility of violation of the mode of operation of a spark-plug 8, the ignition candle 8 temporarily connected, to determine whether violations of the mode of operation of a spark-plug 8. In this regard, the upper limit of the appropriate range (a to B)used for the above-mentioned condition (5)is increased to the upper limit B', because of what the appropriate range is modified. Accordingly, even when the output power of the edf generator 12 AC tends to increase due to deterioration of the battery, the power output edf does not exceed the upper limit of the appropriate range after the start of the connection. Actually the above condition (5) is satisfied, and determining whether violations of the mode of operation of a spark-plug 8 can be performed. Accordingly, to prevent a failure in the detection of violations of work due to degradation of the battery 7 when there is an actual breach of the mode of operation of a spark-plug 8.

Secondly, when the us is ovie (5) is not satisfied due to degradation of the battery 7 when connecting the spark plugs 8, connect spark-plug 8 is repeated until the detection of violations of the mode of operation of a spark-plug 8 is completed. However, in this embodiment, the implementation of the repetition of the connection of a spark-plug 8 can be prevented.

Third, determining whether violations of the mode of operation of a spark-plug 8 is performed immediately after the start of the connection of a spark-plug 8, which all of conditions (1)-(8) are satisfied and the time for which the time required to turn off the power on the spark-plug 8, to obtain the effect of the power output edf, passed after the firing candle 8 is switched from mode to On. in the Off mode. Then is determined not to do more at this time, the change Δedf power output edf compared to the reference value "a". If the determination is positive, it is determined that the malfunction spark-plug 8 has occurred. If the determination is negative, it is determined that the ignition spark is working properly.

To perform a more precise definition of what constitutes a violation of the mode of operation of a spark-plug 8, for example, it is possible to make such a determination based on the fact that satisfied the following conditions (A) and (B): (A) all of the above conditions (1)-(8) are satisfied at the time when you connect the spark plugs 8, and (B) change Δedf output power is barb edf, associated with the completion of the connection, not more than the reference value "a". By determining that there is a malfunction spark-plug 8, when both conditions (A) and (B) are satisfied, you can more accurately determine the existence of a breach of the mode of operation of a spark-plug 8. This is due to the fact that the change in power output edf generator 12 AC is large immediately after the beginning of the connection, and determining whether the change Δedf power output edf more control value "a" at the end of the connection, which terminates above change favorably to more accurately determine whether violations of the mode of operation of a spark-plug 8.

When such a determination constitutes a violation of the mode of operation of a spark-plug 8, it is highly likely that the power output edf exceeds the appropriate range (the range from a to b'), and that the above condition (A) will not be allowed during the period of the temporary connection of a spark-plug 8 in the case of degradation of the battery 7, which detect violations of the mode of operation of a spark-plug 8 fails. Consequently, it is possible that the detection of violations of the mode of operation will fail and the connection of a spark-plug 8 will repeat the sterile, even when there was a malfunction spark-plug 8.

However, the determination of whether a violation of the mode of operation of a spark-plug 8 or not, or determining, properly working ignition candle 8 or not, is performed under circumstances, when all the conditions (1)-(8) are satisfied, immediately after the start of the connection of a spark-plug 8, and the time for which the time required for the start of the connection in order to benefit from the power output edf, has passed. Accordingly, prevents the occurrence of the above events.

The above embodiment may be modified as follows.

Probable case when determining whether violations of the mode of operation of a spark-plug 8 will be impossible immediately after the beginning of the connection, the spark plugs 8, for example, when any of the conditions (1)-(8) becomes unsatisfied directly after the start of the connection. In this case, the detection of violations of the mode of operation of a spark-plug 8 can be performed immediately after the connection. In this respect, no more than if the change Δedf power output edf at the end connection of control value "a"is determined if all of the conditions (1)-(8) are satisfied. If this determination is positive, it specifies the I, what happened violation of the mode of operation of a spark-plug 8. If the determination is negative, then igniting the candle 8 is determined as operating normally. This scheme leads to an increase in the probability of determining the existence of violations of the mode of operation of a spark-plug 8.

Re-detect violations of the mode of operation of a spark-plug 8 after the end of the pilot period may be performed as indicated in the third effect of the present embodiments. This allowed a more accurate re-definition.

The period during which you are connecting spark-plug 8 or the set value can be modified accordingly.

The lower limit A and upper limit of the appropriate range can be appropriately modified.

The upper limit B', which exceeds the upper limit B may be the maximum value (100%) power output edf or any value between the maximum value (100%) and the upper limit B.

The lower limit of the appropriate range can be modified to a value that is increased in accordance with increase of the upper limit to the upper limit B'.

1. Device for diagnosing disorders of the mode of operation of the spark plugs of the internal combustion engine and igniting the candle under luchetta to the power supply from the battery during the pilot period from the beginning of engine start before the completion of engine starting, while the battery is being charged corresponding to the charged state of the electric power generated by the alternator, where the device includes:
section of the preliminary determination to determine probable violation mode of operation, and based on the fact that the power output of the alternator is within a predetermined appropriate range, section preliminary determination determines whether the change in the output power of the alternator more than the control values when the condition of the spark plugs changed from enabled to de-energized at the end of the firing period, and the reference value is the value set to determine whether violations of the mode of operation of a spark-plug, and on the assumption that the change in the output power of the alternator is not more than the control values section of the preliminary determination determines that there is the probability of violations of the mode of operation of a spark-plug;
section confirmation confirming that the violation occurred on the mode of operation of a spark-plug, and when the section of the preliminary determination determines that there is a possibility of violation of the mode of operation of a spark-plug, the section of the confirmation act to connect the spark-plug the belt after the end of the firing period, however, based on the fact that the power output of the alternator is within proper limits, section confirm determines whether the change in the output power of the alternator more control values "and"when firing the spark plug is attached, and moreover, on the assumption that the change in the output power of the alternator is not more than the control values section confirm determines that the violation occurred on the mode of operation of a spark-plug;
section modification based on the definitions section of the preliminary determination that there is a possibility of violation of the mode of operation of a spark-plug, the section modification modifies the upper limit of the appropriate range by increasing the upper limit.

2. The device according to claim 1, in which the section confirm determines, not more than do control values output power is directly after the start of the connection, the spark plugs and the point in time when the time required for the start of the connection in order to obtain the effect of the output power of the alternator, passed, and if the determination is positive, it is determined that the violation occurred on the mode of operation of a spark-plug, whereas if the determination is negative, it is determined that the ignition spark is operate normally.

3. The device according to claim 1, in which the section confirm determines, not more if the control value changes the output power immediately after the connection of the spark plugs, and if the determination is positive, it is determined that the malfunction of the firing of the spark occurred, whereas if the determination is negative, it is determined that the ignition spark is working properly.

4. The device according to claim 1, in which the modified upper limit is the maximum possible value of the power output edf.

5. The device according to claim 1, in which the section modification also modifies the upper limit of the appropriate range based on the definition section of the preliminary determination that there is a possibility of violation of the mode of operation of a spark-plug.



 

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