Control method and system for improving engine consistency

Abstract

The invention discloses a control method for improving engine consistency, relates to the technical field of engine consistency, and solves the technical problem of deviation of ET correction in the existing mode for controlling engine power performance consistency. The method comprises the steps that the actual fuel injection quantity m1, the required fuel injection quantity m0 and a basic ET value of an engine are obtained, the difference between the actual fuel injection quantity m1 of the engine and the required fuel injection quantity m0 of the engine is obtained to obtain a fuel injection quantity difference value m, a corrected ET value is obtained through calculation according to the fuel injection quantity difference value m, the basic ET value is corrected through the corrected ET value, and a final ET value is obtained. And controlling injection parameters of an oil injector according to the final ET value so as to adjust the power of the test prototype to be consistent with the power of the standard prototype. The invention further discloses a control system for improving engine consistency. The power of the engine prototype and the power of the performance machine are kept consistent, and the power performance consistency of the engine in the whole life cycle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine consistency, and more specifically, to a control method and system for improving engine consistency. Background Art

[0002] The control of engine consistency is a technical difficulty in engine performance development. The difference in power performance between the test prototype and the standard prototype, or the change in power performance of the same prototype as the use time increases, are all consistency control issues. There are many factors that affect engine consistency. For example, the characteristic parameters of the injector, one of the key components of the engine, are easily affected by the processing technology and the carbon deposition of the nozzle during use, which in turn affects the actual injection volume m1 of the engine. The change in the actual injection volume will cause the change in the actual rail pressure voltage signal of the main common rail pipe.

[0003] The control of engine power performance consistency is currently mainly improved by correcting the injector ET. The injector ET is mainly determined by the rail pressure signal and the injection volume flow rate, such as Figure 1 As shown in Figure 1, the injection volume flow rate changes with the change of engine load. At present, most solutions only correct ET by the deviation of the rail pressure signal, and do not comprehensively consider the impact of the actual injection volume flow rate on ET, which may cause deviation in the correction of ET. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a control method and system for improving engine consistency in view of the deficiencies in the prior art, and to solve the technical problem that the existing method of controlling the consistency of engine power performance will cause deviations in the correction of ET.

[0005] A control method for improving engine consistency according to the present invention comprises:

[0006] The actual fuel injection amount m1, the required fuel injection amount m0 ​​and the basic ET value of the engine are obtained, and the fuel injection amount difference △m is obtained by subtracting the actual fuel injection amount m1 of the engine from the required fuel injection amount m0 ​​of the engine. A corrected △ET value is calculated according to the fuel injection amount difference △m, and the basic ET value is corrected by the corrected △ET value to obtain a final ET value. The final ET value is executed for fuel injection to adjust the power of the test prototype to be consistent with the power of the standard prototype.

[0007] As a further improvement, the method for obtaining the actual fuel injection amount m1, the required fuel injection amount m0 ​​and the basic ET value of the engine is:

[0008] Acquire the actual load of the engine and the voltage value of the actual rail pressure signal, and calibrate the actual fuel injection amount m1 of the engine according to the actual load of the engine and the voltage value of the actual rail pressure signal;

[0009] Acquire the actual speed of the engine, and calibrate the required fuel injection amount m0 ​​of the engine according to the actual load of the engine and the actual speed of the engine;

[0010] The basic ET value is obtained by the actual speed of the engine and the voltage value of the actual rail pressure signal.

[0011] Furthermore, the expression for calculating the modified ΔET value is:

[0012] △ET=i×△m;

[0013] Where i is the oil volume / ET conversion coefficient.

[0014] Furthermore, the expression for calculating the oil volume / ET conversion coefficient is:

[0015]

[0016] Where i is the oil volume / ET conversion coefficient, and Q is the volume flow rate of the current injection amount.

[0017] Furthermore, the final ET value is the sum of the basic ET value and the modified ΔET value.

[0018] A control system for improving engine consistency, the system comprising:

[0019] The engine speed, load and rail pressure and voltage parameter acquisition module is used to acquire parameters such as the engine speed, actual load, actual rail pressure and voltage signal, and output parameter signals of the engine speed, actual load and actual rail pressure and voltage signal;

[0020] An injector control module, used to execute injection parameters of the injector;

[0021] ECU, used to receive parameter signals of the engine speed, actual load, and actual rail pressure voltage signal;

[0022] The ECU applies the above-mentioned method for improving engine consistency to operate the injector control module through the parameter signals of the engine speed, actual load, and actual rail pressure voltage signal to adjust the power of the test prototype to be consistent with the power of the standard prototype.

[0023] Beneficial Effects

[0024] The advantages of the present invention are:

[0025] The present invention calibrates the actual fuel injection amount m1 of the engine through the actual load of the engine and the voltage value of the actual rail pressure signal, calibrates the required fuel injection amount m0 ​​of the engine through the actual load of the engine and the actual speed of the engine, obtains the basic ET value through the actual speed of the engine and the voltage value of the actual rail pressure signal, obtains the fuel injection amount difference △m by subtracting the actual fuel injection amount m1 of the engine from the required fuel injection amount m0 ​​of the engine, calculates the corrected △ET value according to the fuel injection amount difference △m, corrects the basic ET value according to the corrected △ET value to obtain the final ET value, executes the final ET value to perform fuel injection to adjust the power of the engine, so that the power of the test prototype is consistent with that of the standard prototype, thereby improving the power performance consistency of the engine throughout its life cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the calibration diagram of the existing injector ET;

[0027] Figure 2 A flow chart of a method for improving engine consistency according to the present invention;

[0028] Figure 3 A system structure diagram for improving engine consistency according to the present invention;

[0029] Figure 4 It is a calibration diagram of the oil quantity conversion ET coefficient of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0031] See also Figure 2-Figure 4 , a control method for improving engine consistency of the present invention, the method is:

[0032] The fuel injection amount of the standard prototype under different loads and rail pressure voltage signals is collected, and a load-rail pressure voltage-fuel injection amount data table is prepared.

[0033] The actual load of the engine and the voltage value of the actual rail pressure signal are obtained, and the load-rail pressure voltage-injection amount data table is queried through the actual load of the engine and the voltage value of the actual rail pressure signal to calibrate the actual injection amount m1 of the engine.

[0034] The actual speed of the engine is obtained, and the required fuel injection amount m0 ​​of the engine is calibrated according to the actual load of the engine and the actual speed of the engine.

[0035] The basic ET value is obtained through the actual engine speed and the voltage value of the actual rail pressure signal.

[0036] The fuel injection amount difference △m is obtained by subtracting the actual fuel injection amount m1 of the engine from the required fuel injection amount m0 ​​of the engine, and the corrected △ET value is calculated based on the fuel injection amount difference △m.

[0037] The expression for calculating the corrected △ET value is:

[0038] △ET=i×△m;

[0039] Where i is the oil volume / ET conversion factor. Figure 4 It can be seen that under different rail pressures and loads, the coefficient i has different values, and the coefficient i comprehensively considers the impact of rail pressure and load on ET.

[0040] The expression of oil volume / ET conversion coefficient is:

[0041]

[0042] Where i is the oil volume / ET conversion coefficient, and Q is the volume flow rate of the current injection amount.

[0043] The basic ET value is corrected according to the corrected ΔET value to obtain the final ET value, and the final ET = basic ET + ΔET.

[0044] The injector injection parameters are controlled according to the final ET value to adjust the power of the test sample to be consistent with the power of the performance engine and improve the power performance consistency of the engine throughout its life cycle.

[0045] A control system for improving engine consistency, the system comprising:

[0046] The engine speed, load, rail pressure and voltage parameter acquisition module is used to obtain parameters such as the engine speed, actual load, actual rail pressure and voltage signals, and output parameter signals of the engine speed, actual load, and actual rail pressure and voltage signals.

[0047] The injector control module is used to execute the injection parameters of the injector.

[0048] The standard prototype m0 storage module is mainly used to save and process the actual fuel injection amount of the standard prototype under various loads and current actual rail pressure signals during bench testing.

[0049] The power and torque control module is used to control the power and torque of the engine.

[0050] The ECU is used to receive parameter signals of engine speed, actual load, and actual rail pressure voltage signals.

[0051] The ECU applies the above control method for improving engine consistency to operate the injector control module through parameter signals of the engine speed, actual load, and actual rail pressure voltage signal to adjust the power of the engine prototype to be consistent with the power of the performance machine, and improve the power performance consistency of the engine throughout its life cycle.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A control method to improve engine consistency, It is characterized in that The method is: The actual fuel injection amount m1, the required fuel injection amount m0 ​​and the basic ET value of the engine are obtained, and the fuel injection amount difference △m is obtained by subtracting the actual fuel injection amount m1 of the engine from the required fuel injection amount m0 ​​of the engine. A corrected △ET value is calculated according to the fuel injection amount difference △m, and the basic ET value is corrected by the corrected △ET value to obtain a final ET value. The final ET value is executed for fuel injection to adjust the power of the test prototype to be consistent with the power of the standard prototype.

2. A control method for improving engine consistency according to claim 1, It is characterized in that The method for obtaining the actual fuel injection amount m1, the required fuel injection amount m0 ​​and the basic ET value of the engine is: Acquire the actual load of the engine and the voltage value of the actual rail pressure signal, and calibrate the actual fuel injection amount m1 of the engine according to the actual load of the engine and the voltage value of the actual rail pressure signal; Acquire the actual speed of the engine, and calibrate the required fuel injection amount m0 ​​of the engine according to the actual load of the engine and the actual speed of the engine; The basic ET value is obtained by the actual speed of the engine and the voltage value of the actual rail pressure signal.

3. A control method for improving engine consistency according to claim 2, It is characterized in that The expression for calculating the modified ΔET value is: ΔET= i ×Δm; Where i is the oil volume / ET conversion coefficient.

4. A control method for improving engine consistency according to claim 3, It is characterized in that The expression for calculating the oil volume / ET conversion coefficient is: Where i is the oil volume / ET conversion coefficient, and Q is the volume flow rate of the current injection amount.

5. A control method for improving engine consistency according to claim 4, It is characterized in that The final ET value=basic ET value+corrected ΔET value.

6. A control system to improve engine consistency, It is characterized in that The system includes, The engine speed, load and rail pressure and voltage parameter acquisition module is used to acquire parameters such as the engine speed, actual load, actual rail pressure and voltage signal, and output parameter signals of the engine speed, actual load and actual rail pressure and voltage signal; An injector control module, used to execute injection parameters of the injector; ECU, used to receive parameter signals of the engine speed, actual load, and actual rail pressure voltage signal; The ECU applies a control method for improving engine consistency as described in any one of claims 1 to 5 to operate the injector control module through parameter signals of the engine speed, actual load, and actual rail pressure voltage signal to adjust the power of the test prototype to be consistent with the power of the standard prototype.

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