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

FIELD: engines and pumps.

SUBSTANCE: invention relates to ICEs. Particularly, it relates to engine adaptation of octane number by conversion of identified octane number. Proceeding from check advance ignition adjustment at engine operating range for definite octane number said operating range is divided into several zones (1-16). Note here every said zone comprises includes antiknock advance ignition correction magnitude of check adjustment. Changeover to check adjustment corresponding to lower octane number is performed. When threshold magnitude of advance correction cycle (S1_2-S16_2) is exceeded at one zone, or when zone counter wherein another threshold magnitude (S1_1-S16_1) is exceeded, multi-zone threshold (S3) is exceeded.

EFFECT: engine adaptation to fuel octane number.

6 cl, 2 dwg

 

The present invention relates to a method of adapting the engine to the degree of enrichment of the fuel, in particular for 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 decremental 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 USA, 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 there is Atisa resounding knock, in particular, when the engine is optimized for fuel with an octane number that is higher than 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, in accordance with 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.

p> For example, upon detection of a ringing knock during the time t the fast cycle (BR) and a slow loop (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 ringing a 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. Indeed, they either lack the efficiency and accuracy of the detected octane number, or they remain constantly on the border detection ringing knock that may continue to hurt the camera is gorania.

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

In this regard, the first object of the invention is a method of adapting the engine to the octane number of the fuel (by decremental identified octane number), in which

the engine has a control and adjustment of the ignition timing in the engine for a specific octane number, with the specified control setting corresponds to the operation without ringing engine knock (but on the border of occurrence of ringing knock) for a particular mode and torque

this region 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:

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

in the case of detecting the presence of ringing knock over a period of time t activate the cycle of correction of the ignition timing;

in each period of time (X MS) produce incremental counter (CTR) the number of zones number of zones, in which the correction timing exceeds a predefined first threshold, typical of this region;

- carry out test correction operi is of each zone, to determine not exceeded if the specified correction timing a predefined second threshold, typical of this region;

in which, when the count of the number of zones reaches or exceeds a predefined third threshold or when the correction timing, at least one zone exceeds the second threshold, characteristic for this zone, make the transition to a control setting corresponding to a lower octane number.

Under the "scope of work of the 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 setpoints motor control, including the setting value of the ignition advance 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. For example, the maximum torque produced by the engine depends on the octane number. The transition to control maintains is VCE corresponds to a transition to another area of the engine.

Preferably the correction cycle contains a quick loop and slow loop, and incremental count of the number of zones and the determination of correction of the ignition timing based on the values of the slow loop (BL) in different zones of the field of operation of the engine.

Preferably each zone stores in memory the last correction of the ignition timing, in particular, the last correction of the slow loop (BL) ignition timing.

Saving in memory the last correction of the slow loop (BL) angle of ignition in the area allows, in particular, when returning to the area not to distribute a basic value of ignition timing, and to use the pre-defined characteristics and to distribute the last of the obtained correction value.

In particular, the transition from one control to adjust the lower control setting memory each zone re-initialize the correction value of the ignition timing angle.

Preferably, the counter of the number of zones is set to zero at each step of the calculation, to always have an updated number of zones.

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

Preferably, the control adjustment is based, at least three adjustable octane numbers. You can choose the following octane rating: 98, 95, 91 and 87. However, these OK the new number can be chosen freely to ensure adaptation to the needs and working conditions of the engine.

According to the private option, you can add at least one adjustment for ethanol, including E85 and/or E100.

According to the private option run, each control adjusts contains at least four zones, and preferably at least sixteen zones.

Preferably the region 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 occurrence of ringing knocking 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.

These areas are called zones 1 to 16, and each of them contains the initial detonation of the correction value, and two thresholds associated with single-band or multi-band transition.

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

figure 1 - scope of work of the engine of the vehicle;

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

Figure 1 shows the region of operation of the engine of the vehicle, where the x-axis describes the number of revolutions of the active ingredient is the engine per minute and the y-axis characterizes the load of the engine, also called torque, Nm 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 corresponds to the correction value zone 2. These different correction values must adjust operi is in the ignition, 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.

Each phenomenon 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 at each occurrence a resounding knock. If the ringing phenomenon knock is no longer 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 cycle, in this example, 0.5. At the same time rapid cycle (BR) is revoked. If this is m in period t+1 receive the correction value of 29.5 and in period t+2 - the correction value is 30, and so on. When the ringing phenomenon knock 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 lower octane number, is shown in chart form in figure 2.

The first variant of the transition is based on the fact that each zone from 1 to 16 contains a threshold value (S1_2 to S16_2) cycle correction timing. If the threshold value is exceeded, at least in one area, consider that adjusting the timing does not match this type of fuel, and go to the control adjustment, adapted to lower the octane number.

In this embodiment, as the threshold values of the transition will take is slow correction cycle timing (BL) 4, irrespective of the considered zone. This sets the threshold timing 4 (S1_2=4) for zone 1, the threshold timing 4 (S2_2=4) for zone 2, and so on. You can provide different thresholds in different zones.

When in zone 1 correction slow cycle (BL_1) incrementorum will yedeklemedir depending on the detection of a ringing clatter. If you are in the area of the detected ringing knock correction slow cycle fully incrementorum (2 in this embodiment). The correction value slow cycles surrounding areas incrementorum partially. If you are in zone 1 ringing knock is not detected at a lower amplitude than in the case of detected knock (in this case 0.5), and fully decrements correction slow cycle (BL_1) zone 1 and partly correction values slow cycles of neighboring zones.

The correction value slow cycles can be stored in memory or regularly reset to zero, for example, when refueling, or any other pre-determined time.

Given the mechanisms of incremental and decremental correction slow cycle as soon as the latter reaches at least 4 in zone 1, is transferred to the control setting corresponding to the fuel with an octane rating of 91 (assuming that the original control adjustment was based on the octane number 98).

You can provide multiple control adjustments, corresponding to different octane numbers. Each control adjusts ignition timing determines the adjustment of the ignition timing and the threshold value correction slow cycle variation octane number.

Second parentparent to the control setting, associated with a lower octane fuel than when the current control setting based on the fact that for each zone define another threshold (S1_1 to S16_1) correction of the slow loop (BL), beyond which the area consider using a count of the number of zones (CTR). You get a number of zones for which the threshold Sn_1 associated with each of the zones n is exceeded. When this number reaches or exceeds multi-zone threshold (S3), go to the control setting that is associated with a lower octane number than the current setting.

For example, if the threshold S3 is defined in the value of 3 is enough to slow the cycle zone 1 exceeded S1_1, slow loop zone 2 exceeded S2_1, and slow cycle zone S4_1 to go to the adjustment octane number 91 (assuming that the original control adjustment was based on the octane number 95).

This calculation zones by means of a counter CTR produce every X MS (X is, for example, 100), and this counter is transferred to zero every X MS before the beginning of the count.

Thus have two possible switch to adjust for lower octane number, the first of which is based on the threshold correction timing slow cycle, at least one zone, and the second run when reaching or exceeding the number of zones, in which the CDF is under slow cycle exceeds another threshold.

Each zone retains the last value correction slow cycle, so that during the next passage of this zone to distribute the optimal adjustment value. However, these values can be translated to zero during a change of control of the adjustment and, therefore, the operation of the engine.

1. Method adaptation of the engine to the octane number of the fuel by decremental identified octane number, while performing the control and adjustment of the ignition timing in the engine (10) for a given octane number, with the specified control setting corresponds to the operation without ringing engine knock for a certain mode (N) and torque, and the area of operation of the engine (10) is divided into multiple zones (1-16), each of which contains the anti-knock correction value of the ignition timing control adjustment, this perform at least the following stages:
- make the detection of the presence of ringing knock over a certain period of time t;
in the case of detecting the presence of ringing knock over a period of time t activate the cycle of correction of the ignition timing;
in each period of time (X MS) produce incremental counter (CTR) the number of zones number of zones, in which the correction timing exceeds a pre-defined first the first threshold, characteristic for this zone;
- perform test correction timing of each zone to determine not exceeded if the specified correction timing a predefined second threshold, typical for this area;
in which, when the count of the number of zones reaches or exceeds a predefined third threshold or when the correction timing, at least one zone, exceeds the second threshold, characteristic for this zone, make the transition to a control setting corresponding to a lower octane number.

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

3. The method according to claim 1 or 2, characterized in that each zone stores in memory the last correction of the ignition timing.

4. The method according to claim 3, characterized in that the transition from one control to adjust the lower control setting memory each zone re-initialize the correction value of the ignition timing angle.

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

6. The method according to claim 1 or 2, characterized in that each stake is control adjustment includes, at least four zones, and preferably at least sixteen zones.



 

Same patents:

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.

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FIELD: transport.

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EFFECT: creation of method and device for detecting the detonation which is capable of detecting precisely whether the detonation occurred or not.

24 cl, 28 dwg

FIELD: engines and pumps.

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EFFECT: higher thermal efficiency.

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EFFECT: decreased noise, higher accuracy of detonation determination.

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FIELD: engines and pumps.

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FIELD: mechanical engineering; internal combustion engines.

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The invention relates to a method and apparatus control the detonation of the internal combustion engine (ice)

The invention relates to a method of eliminating detonation knocking in the internal combustion engine (ice) when in dynamic mode

The invention relates to a method of job control ignition values in the internal combustion engine is in the acceleration mode

The invention relates to measuring and diagnostic equipment and can be used for registration of detonation engine

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: invention is aimed at increasing efficiency of discrimination of signals caused by knocking in internal combustion engine from signals caused by other noises in engine. Method is implemented by means of at least one detonation combustion sensor and signal processing unit installed after detonation combustion sensor and provided with at least one comparator. Output signal from detonation combustion sensor is compared after processing by comparator with variable reference value of level formed basing on preceding output signals of said combustion detonation sensor. Reference value of level passes into comparator through low-pass filter, and comparator indicates presence or absence of knocking basing on results of comparing. Tracking of reference value of level or calculation of value of input signal of low-pass filter are carried out at least by two different methods. Method is chosen depending on presence or absence of dynamic mode of engine operation.

EFFECT: improved efficiency of discrimination of signals caused by knocking.

5 cl, 6 dwg

FIELD: engines and pumps.

SUBSTANCE: method to control operation of an internal combustion engine with multiple combustion chambers includes introduction of advance into synchronisation of ignition in the first subgroup of combustion chambers from working synchronisation of ignition, until a detonation event is registered, simultaneously operation of other combustion chambers with working synchronisation of ignition is controlled. The first border of detonation is determined for the first subgroup of combustion chambers in compliance with the difference between working synchronisation of ignition and ignition synchronisation in case of the detonation event. Properties of fuel supplied into combustion chambers are determined in compliance with at least the first detonation border.

EFFECT: provision of internal combustion engine operation parameters control with account of fuel quality variation and conditions of engine operation.

20 cl, 4 dwg

FIELD: transport.

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EFFECT: decreased noise, higher accuracy of detonation determination.

5 cl

FIELD: engines and pumps.

SUBSTANCE: proposed internal combustion engine comprises expansion ratio control mechanism A to vary expansion ratio and mechanism C to control gas phase distribution at outlet to vary moment of opening of exhaust valve 9. Expansion ratio and moment of exhaust valve opening are selected subject to engine load so that with engine load increasing, expansion ratio increases while moment of exhaust valve sifts toward delay in intake stroke BDC.

EFFECT: higher thermal efficiency.

6 cl, 23 dwg

FIELD: transport.

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EFFECT: creation of method and device for detecting the detonation which is capable of detecting precisely whether the detonation occurred or not.

24 cl, 28 dwg

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

FIELD: engines and pumps.

SUBSTANCE: invention relates to ICEs. Particularly, it relates to engine adaptation of octane number by conversion of identified octane number. Proceeding from check advance ignition adjustment at engine operating range for definite octane number said operating range is divided into several zones (1-16). Note here every said zone comprises includes antiknock advance ignition correction magnitude of check adjustment. Changeover to check adjustment corresponding to lower octane number is performed. When threshold magnitude of advance correction cycle (S1_2-S16_2) is exceeded at one zone, or when zone counter wherein another threshold magnitude (S1_1-S16_1) is exceeded, multi-zone threshold (S3) is exceeded.

EFFECT: engine adaptation to fuel octane number.

6 cl, 2 dwg

FIELD: engines and pumps.

SUBSTANCE: invention can be used at designing control system for ICE 2 running on several types of fuel. Identification of knocks at changing the type of fuel consists in registration of characteristic of signal (ikr) describing the ICE housing noise and definition of base level of background noise (rkr) by filtration in low-pass filter (LPF) LPF filtration factor (TPF) is varied during transition from one fuel to the other. Note here that magnitude of said factor is set to lower value that moment. Occurrence of knocks is defined proceeding from threshold value (SW) to be coordinated at changing of fuel type. Proposed device comprises housing noise registration unit 5 to record the characteristic of signal (ikr) and knocks identification unit 4 to register aforesaid signal and to determine its base level (rkr). Adjustment is performed by changing the throttle position, amount of fed fuel or ignition dwell angle.

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EFFECT: suppressed increase in the ignition required voltage at fuel feed termination.

3 cl, 10 dwg

FIELD: engines and pumps.

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EFFECT: higher accuracy of control.

4 cl, 1 dwg

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