Adaptation of engine to fuel octane number by conversion of fuel identified octane number

FIELD: engines and pumps.

SUBSTANCE: invention relates to internal combustion engines. Particularly, it relates to adaptation of engine to fuel octane number by conversion of the fuel identified octane number. Proceeding from spark advance check adjustment in the area of measured engine operating magnitudes, for definite octane number this area of measured engine operating magnitudes is divided into several zones (1-16); note here that every said zone comprises antiknock correction value for spark advance for said check adjustment. Here, changeover to check adjustment is performed corresponding to higher octane number: when incremental counter (TDC_CTR) of TDC number exceeds definite threshold (S3) if advance correction at current zone is smaller than definite threshold (S1_1-S16_1), or when zone number counter wherein advance correction cycle is smaller than the other threshold (S1_2-S16_2) exceeds multi-zone threshold (S3).

EFFECT: engine adaptation to fuel octane number.

7 cl, 3 dwg

 

The present invention relates to a method of adapting the engine to the octane number of the fuel. In particular, the invention relates to engines with controlled ignition, in which the ignition advance can be controlled by electronic means. In particular, the invention relates to a method of adaptation through incremental identified octane fuel.

Currently use different fuels with different characteristics. Among these characteristics appears octane number. Among the various existing fuels octane rating can take the approximate values of 98, 95, 91 and 87. Fuel with an octane rating of 98 and 95 is often used in Europe, fuel with an octane rating of 91 can be found in the U.S. and fuel with an octane rating of 87 is used, for example, in Iran.

To optimize the compromise between performance, consumption and reliability, it is desirable that the adjustment of the engine and, in particular, adjusting the ignition timing corresponded to each octane number.

When adjusting the ignition timing corresponds to one octane number, and the used fuel has more octane, in particular, when changing the geographical area, the engine may not be satisfactory. For example, it may receive a resounding thud, in particular, in the case to the da engine optimized for fuel with an octane number exceeding the octane number of the fuel used, or the engine may not be optimal in the case of a fuel with an octane number lower octane number, which adjusted the engine.

A resounding knock may be associated with occurrence of abnormal combustion detonation, creating, in particular, a large transfer of heat, which can damage the combustion chamber. A resounding knock, you may receive more or less randomly under certain conditions, in particular, when the octane number does not correspond to the adjustment of the engine.

Among the ways to eliminate the phenomenon of resonant knock, you can specify the anti-knock correction, which will be described below. It is mainly used for small deviations. This correction, which is more superficial, it is not possible to satisfactorily resolve phenomena ringing knock when there is too much discrepancy between the octane number.

This well-known anti-knock correction includes two types of actions:

quick correction, also called rapid cycle (BR), which significantly reduces the ignition advance and

slow correction, also called slow loop (BL), which to a lesser extent, reduces the ignition advance.

For example, upon detection of a ringing knock during the time t the fast cycle (BR) and slow qi is l (BL) activate, to get the value of X of correction of the ignition timing to eliminate ringing knock.

In period t+1 if the ringing knock is not detected, value is the slow loop (BL) is reduced by a specified amount. This value is reduced again in each time period t+1, for which the resonant knock not find.

When the ringing phenomenon knock is detected again, the fast cycle (BR) and a slow loop (BL) again activate again to adjust the ignition advance.

It is also known device that allows you to control two adjustments, based on two different octane numbers. If ringing knock discover within some period of time for adjustment, based on the octane number of 98, adjustment to change, to move to adjust to the octane number of 91. During a stop of the engine, the adjustment of the "translate to zero, i.e. the setting returns to the default throttling (based on the octane number 98).

However, these devices correction are not perfect. These devices either lack of efficiency and accuracy in the detected octane number, or they remain constantly on the border detection ringing knock that may continue to hurt the combustion chamber.

If you use the octane number lower octane number that is used to regulated the Cai engine, risk of damage there, but the operating mode of the engine when it is not optimal.

Currently there is no device that allows you to accurately adjust the tilt motor octane number of the fuel, in order to optimize engine performance.

The present invention is to provide a better adaptation of the engine to the octane number of the fuel.

The first object of the invention is a method of adapting the engine to the octane number of the fuel by incrementaly identified octane number, with this method comes from the control and adjustment of the ignition timing in the field of engine operation for a specific octane number, with the specified control setting corresponds to the operation without ringing knock (but on the border ringing knock) engine for certain modes (N) and torque, and the field of operation of the engine is divided into several zones, each of which contains anti-knock correction value of the ignition timing control adjustment, the method includes at least the following steps:

- when you activate method counter (TDC_CTR) number of upper dead point initialize to 0;

- make the detection of the presence of ringing knock over a period of time t;

- in case of detection when Ustia ringing knock over a period of time t activate the cycle of correction of the ignition timing;

in the absence of detection of a ringing knock over a period of time t+1 to produce decremental part of the cycle of correction of the ignition timing;

- if the correction timing in the current zone is less than the threshold, characteristic for this zone, make incremental counter top dead point;

in each period of time (X MS) produce incremental another counter (CTR) the number of zones number of zones in which the correction cycle timing is less than another threshold, characteristic for each zone;

the excess of a certain threshold, the count of the upper dead point or reaching or exceeding a certain other threshold counter of the number of zones entails moving the control setting corresponding to a higher octane number.

Incremental counter top dead spots produced in each of the upper dead point (1/2 turn engine with four-cylinder engine).

Under "field engine" shall mean the interval between the x-axis, characterizing the rate of rotation of the engine (mode), usually in revolutions per minute (rpm), y-axis, characterizing the load of the engine, as a rule, in Newton metres (Nm), and the curve characterizing the maximum performance of the engine.

Under the "control setting" should be understood the acceptable values for engine control, including the set value of the ignition timing in the field of engine operation, with the adjustment set to a certain mode and torque.

Each control adjustment may be specific to the field of engine operation and to vary the octane number of the fuel. It is obvious that the transition to the control setting corresponds to the transition to another field of work of the engine.

According to the private option execution cycle correction contains the fast cycle (BR) and a slow loop (BL), while incremental each counter based on the values of the slow loop (BL) in different zones of the field of operation of the engine.

Preferably the correction cycle timing return to zero at the transition to the control setting corresponding to a higher octane number.

In a preferred embodiment, the count number of the upper dead point re-initialize when the transition to the control setting corresponding to a higher octane number.

In particular, the method comprises at least three control adjustment.

Preferably, the control adjustment is based on regulated octane numbers, for example in the following octane numbers: 98, 95, 91 and 87.

According to the private version is running, you can add at least one regulation is ovcu for ethanol, including E85 and/or E100.

According to the private version of the execution, each control adjusts contains at least four zones, and preferably at least sixteen zones.

Preferably the field of engine operation, each control adjustment contains at least 18 zones.

Among them, the first area, hereafter referred to as area 0, which does not require a correction value of the ignition timing, in which the risk of sounding thud considered sufficiently low.

Extreme zone, hereinafter referred to as area 17, in which it is difficult to detect a ringing clatter of the engine, and apply the knock correction value of the previous zone.

The following zone is called zone 1 zone 16, and each of them contains the initial detonation of the correction value, and two thresholds associated with the transition to higher octane number.

The present invention is illustrated by drawings, which presents the following:

figure 1 - region measured values of engine operation of the vehicle;

figure 2 - chart of method adaptation in accordance with the present invention;

figure 3 - installation diagram counter top dead points carried out for each of the upper dead point, the final value which is used in the diagram in figure 2 for the conditions TDC_CTR>S4.

Figure 1 until the ANO field operation of the vehicle engine, where the x-axis characterizes the mode N in rpm of the engine, and the y-axis characterizes the load of the engine, also called torque in N-m Curve characterizes the performance of the engine.

This figure shows the mesh consisting of the eighteen zones, numbered from 0 to 17.

Zone 0 is defined below a specific torque, does not require a separate control ignition timing, since the phenomenon of resonant knock is rare and cannot damage the combustion chamber.

In area 17 defined above set speed, it becomes difficult to detect the phenomenon of resonant thud. In this case, apply the correction value of the previous completed zone.

Each of the zones 1-16 contains anti-knock correction value to a slow cycle (BL) ignition timing.

For example, zone 1 may be a correction value (BL_1) 2, zone 2 - correction value (BL_2) 5, zone 3 - correction value (BL_3) in 4, zone 4 - a correction value (BL_4) in 1 and so on.

During engine operation, the transition from zone 1 will require ignition timing at 29, which corresponds to the control adjustment at 31 minus the correction value of 2, the corresponding correction value zone 1. If the engine is in the zone 2, the ignition advance is 35, which corresponds to 40 control adjustment minus 5, which are appropriate to esthet correction value zone 2. These different correction values have to adjust the ignition advance, to ensure that without sounding thud.

However, the phenomenon of resonant knock is not always clear, particularly if you choose a fuel with a lower octane rating.

Whenever a resounding knock, regardless of the considered zone, activate the correction cycle timing, usually containing the fast cycle (BR) and a slow loop (BL). Thus, at each occurrence ringing knock the slow loop (BL) incrementorum at a predetermined value. For example, assume that the fast cycle (BR) gives the correction in 4, and the slow loop (BL) - correction in 2 whenever a resounding knock. If the ringing phenomenon knocking is not detected, the slow loop (BL) decreases over time at a predetermined value. For example, in each time period t+1 is reduced to a quarter of their original values, i.e. by 0.5.

Thus get the following working: when navigating in zone 1 use the total value determined above 31-2. If you discover a resounding thud, subtract the values of the fast cycle (BR) 4, and the slow loop (BL) 2. By adjusting the ignition timing 31-4-2, 25. In period t+1 if the ringing phenomenon knock disappears, decrements the value of the slow qi is La, in this example, 0.5. In period t+1 receive the correction value of 29.5 and in period t+2 is the correction value of 30, and so on. When ringing thud find again, again activate the cycle of correction. In this case, you can take as a basis the period t+3, in which is found a resounding thud, and because a previous correction value was 30, subtract from it the value of BR+BL, that is, 4+2. By adjusting the ignition timing at 24 degrees.

The invention is based on two variants of the transition to the control setting corresponding to a higher octane number, is shown in chart form in figure 2.

In the first embodiment, each of the top dead point (1/2 turn engine with four-cylinder engine), as only a slow loop (BL) of the current working area becomes less characteristic for this zone threshold, incrementorum counter (TDC_CTR). This counter has a threshold value (S4), which if exceeded, causes a transition to the control setting corresponding to a higher octane number.

In the second embodiment, every X MS (for example, X=100) count the number of zones, in which the correction of the slow cycle below is typical for this zone threshold. For this purpose, the counter (CTR), initialized to 0 every X milliseconds before counting zones. This counter has then the advice is (S3), at or above which immediately jumps to the control setting corresponding to a higher octane number.

In this example, as the threshold value S4 for counter top dead points in the first scenario, the transition value is 1000.

According to this first embodiment of the transition, the counter TDC_CTR activate on when you activate method. While the current working zone different from the zone 1-16 or correction ahead of the slow loop (BL) in the current area of more threshold characteristic of this zone, the counter is not incrementorum. In each of the upper dead point (1/2 turn for a four-cylinder four-stroke engine) check the value of the slow loop (BL) area relative to the edge of this zone, as shown in the diagram in figure 3, where "x" denotes the number of zones.

For example, in the upper dead point n in zone 1, if the slow loop (BL) zone 1 (BL_1) is less than the threshold S1_1 defined in this zone, the counter TDC_CTR incrementorum 1. In the top dead point n+1, which is in the same area, if after the upper dead point n not found any phenomena ringing knock, slow cycle still remains below the threshold S1_1. In this case, the counter TDC_CTR again incrementorum.

If you go into the upper dead point n+2 in another area, for example in zone 2, in which the slow loop (BL) is less than p the horns S2_1 this zone, incrementorum counter TDC_CTR. If this zone is detected ringing knock between the upper dead point n+2 and n+3, incrementorum is slow cycle. For example, if it exceeds the threshold S2_1 in the top dead point n+3, the counter TDC_CTR not incrementorum. This process is carried out while the engine is running. When the count number of the top dead point TDC_CTR exceeds the threshold S4, the method proceeds to control the adjustment corresponding to a higher octane number.

During the transition to the higher octane number of the count upper dead point again initialize (TDC_CTR=0).

The method also includes the condition level correction of timing slow cycle (BL) for all zones. Each zone corresponds to the threshold correction slow cycle, which, when it is reached on the number of zones defined by the threshold S3, causes a transition to the control setting corresponding to a higher octane number.

In this example, the value 6 as the threshold value S3 in the number of zones for the second variant of the transition.

For example (see figure 2), every X MS (for example, X=100) count the number of zones for which the threshold correction slow cycle has not been reached. At time t initialize the counter CTR (CTR=0). If the correction of the slow cycle (BL_1) zone 1 is less than the threshold S1_2, incrementorum counter CTR. If the correction slow the th cycle (BL_3) zone 3 more threshold S3_2, the counter CTR is not incrementorum. In our example, if the counter CTR reaches or exceeds 6, moving to a higher control setting, for example, make the transition from regulation octane number SP95 to adjustment octane number SP98.

After passing to a higher control setting or multi-zone threshold (S3), or the condition number of the top dead point (S4) check to work in this setting was optimal for a certain period of time. If the adjustment is correct, continue to apply the new setting, otherwise move to a lower setting. In the case of the transition to a lower setting, the adjustment is no longer raise before the discovery of petrol.

In other words, the lack of resounding knock at the given engine speed or a slight correction level slow cycle (BL) ringing knock in several areas of the engine leads to a transition to a higher setting. If you believe that work is normal, particularly with regard to ringing knock detected during this adjustment, the current adjustment stabilize. Otherwise, go back to the previous setting.

1. Method adaptation of the engine to the octane number of the fuel by incrementaly identified octane number, in the specified fashion perform control and adjustment of the ignition timing in the field measured values of engine operation for a given octane number, when the specified control setting corresponds to the operation without ringing sound of the engine for the given mode (N) and torque, while the area of the measured values of engine operation is divided into several zones, each of which contains anti-knock correction value of the ignition timing control adjustment, and in the process perform at least the following stages:
- when you activate method counter (TDC_CTR) number of upper dead point initialize to 0;
- detects the presence of a resonant knock over a period of time t;
- in case of detection of a ringing knock over a period of time t activate the cycle of correction of the ignition timing;
in the absence of detection of a ringing knock over a period of time t+1 to produce decremental part of the cycle of correction of the ignition timing;
- if the correction timing in the current zone is less than the threshold, characteristic for this zone, make incremental counter (TDC_CTR) number of upper dead points;
in each period of time (X MS) produce incremental another counter (CTR) the number of zones number of zones in which the correction cycle timing is less than another threshold, characteristic for each zone;
with in excess of a predetermined threshold (S4) count (TDC_CTR) upper dead points or achieving or exceeding another predetermined threshold (S3) with what etzikom (CTR) the number of zones are transferred to the control setting, the corresponding higher octane number.

2. The method according to claim 1, characterized in that the correction cycle contains the fast cycle (BR) and a slow loop (BL), while incremental each counter based on the values of the slow loop (BL) in different zones of the field measured values of engine operation.

3. The method according to claim 1 or 2, characterized in that the correction cycle timing return to zero at the transition to the control setting corresponding to a higher octane number.

4. The method according to claim 1 or 2, characterized in that the counter (TDC_CTR) number of upper dead point re-initialize when the transition to the control setting corresponding to a higher octane number.

5. The method according to claim 1 or 2, characterized in that it contains at least three control adjustment.

6. The method according to claim 5, characterized in that the control adjustment is based on regulated octane numbers.

7. The method according to claim 1 or 2, characterized in that each control adjusts contains at least four zones, and preferably at least sixteen zones.



 

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