Method for calibrating ignition timing, test bench device and engine control system

Abstract

The application discloses a method for calibrating an engine ignition advance angle, a bench test equipment for calibrating the engine ignition advance angle and an engine control system. The method comprises the following steps: sending an engine target working condition instruction to make the engine operate in a target working condition state; obtaining a calibration reference parameter based on a combustion pressure signal in the engine operation; and determining a target ignition advance angle of the engine corresponding to the target working condition state according to the calibration reference parameter. The method for calibrating the engine ignition advance angle in the embodiment of the application determines the target ignition advance angle of the engine corresponding to the target working condition state through the calibration reference parameter, is not influenced by artificial factors, makes the calibration process more objective, and improves the accuracy and calibration rate of the ignition advance angle calibration.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, in particular to a method for calibrating an ignition advance angle of an engine, a bench test device and an engine control system. BACKGROUND

[0002] The matching of the engine bench makes the engine have good steady-state performance, which can ensure that the engine reaches the design power, torque and fuel consumption performance under the conditions of no knock and no overheating. Through the matching of the engine and the vehicle, the engine and other systems of the vehicle work coordinately to ensure that the engine has good starting idle performance, good driving comfort and good emission performance under various environments and working conditions.

[0003] The calibration technology of the engine is the coordination of air intake, fuel injection and ignition, and the calibration of the engine is directly related to the power, economy and emission level of the engine. The engine bench calibration experiment generally adopts manual bench experiment scanning by artificial manual operation. However, the artificial experiment scanning is greatly affected by the human factors of the experimenters, the calibration rate is slow, and the calibration accuracy is low. SUMMARY

[0004] The present application aims to solve at least one of the technical problems in the prior art. To this end, one object of the present application is to provide a method for calibrating an ignition advance angle of an engine, which can automatically calibrate the ignition advance angle of the engine and improve the calibration rate and accuracy of the ignition advance angle of the engine.

[0005] A second object of the present application is to provide an engine control system.

[0006] A third object of the present application is to provide a bench test device for calibrating an ignition advance angle of an engine.

[0007] To achieve the above object, a first aspect of the present application provides a method for calibrating an ignition advance angle of an engine, comprising: sending an engine target working condition instruction to make the engine operate in a target working condition state; obtaining a calibration reference parameter based on a combustion pressure signal in the operation of the engine; and determining a target ignition advance angle corresponding to the target working condition state of the engine according to the calibration reference parameter.

[0008] According to the method for calibrating the ignition advance angle of the engine, the calibration reference parameter is obtained according to the combustion pressure signal in the engine operation, and the target ignition advance angle of the engine corresponding to the target working condition state is determined according to the calibration reference parameter, that is, the target ignition advance angle of the engine is determined through the calibration reference parameter, automatic calibration of the ignition advance angle of the engine is realized, manual experimental scanning is not needed, the influence of human factors on the calibration of the target ignition advance angle is avoided, and the calibration rate and calibration accuracy are improved.

[0009] In some embodiments, the calibration reference parameter includes the knock pressure and the crankshaft rotation angle corresponding to 50% of the combustion, and the target ignition advance angle of the engine corresponding to the target working condition state is determined according to the calibration reference parameter, including: when it is determined that the knock pressure is less than a preset pressure threshold and the crankshaft rotation angle corresponding to 50% of the combustion falls within a preset angle range, the current ignition advance angle of the engine is determined as the target ignition advance angle. By taking the calibration reference parameter as the basis for judging whether the current ignition advance angle of the engine is the target ignition advance angle, the calibration accuracy is higher.

[0010] In some embodiments, the target ignition advance angle of the engine corresponding to the target working condition state is determined according to the calibration reference parameter, and further includes: a first determination step of determining that the knock pressure is less than a preset pressure threshold and the crankshaft rotation angle corresponding to 50% of the combustion does not fall within a preset angle range; a first adjustment step of adjusting the current ignition advance angle of the engine; a first acquisition step of acquiring a revised crankshaft rotation angle corresponding to 50% of the combustion after the ignition advance angle of the engine is adjusted; a first judgment step of judging whether the revised crankshaft rotation angle falls within the preset angle range; if the revised crankshaft rotation angle does not fall within the preset angle range, the first adjustment step, the first acquisition step and the first judgment step are repeatedly executed; and if the revised crankshaft rotation angle falls within the preset angle range, the adjusted ignition advance angle is determined as the target ignition advance angle. By adjusting the current ignition advance angle of the engine according to the calibration reference parameter, the process is simple, and the calibration accuracy is higher.

[0011] In some embodiments, the preset angle range includes a lower angle threshold, and the first adjustment step of adjusting the current ignition advance angle of the engine includes: when it is determined that the crankshaft rotation angle corresponding to 50% of the combustion is less than the lower angle threshold, the current ignition advance angle is reduced by a first preset angle amplitude. By reducing the current ignition advance angle of the engine to increase the crankshaft rotation angle corresponding to 50% of the combustion, the knock pressure and the crankshaft rotation angle corresponding to 50% of the combustion both satisfy the set condition, so that the automatic calibration of the current ignition advance angle of the engine is realized.

[0012] In some embodiments, the preset angle range comprises an upper angle threshold, and the first adjusting step of adjusting the current ignition advance angle of the engine comprises: when it is determined that the crank angle corresponding to the 50% combustion is greater than the upper angle threshold, increasing the current ignition advance angle by a second preset angle range. By increasing the current ignition advance angle of the engine to reduce the crank angle corresponding to the 50% combustion, the knock pressure and the crank angle corresponding to the 50% combustion both satisfy the set condition, so that the automatic calibration of the current ignition advance angle of the engine is realized.

[0013] In some embodiments, the determining the target ignition advance angle of the engine corresponding to the target working condition state according to the calibration reference parameter further comprises: a second determining step of determining whether the knock pressure is greater than the preset pressure threshold; a second adjusting step of decreasing the current ignition advance angle by a third preset angle range; a second obtaining step of obtaining a revised knock pressure of the engine after adjusting the ignition advance angle; a second determining step of determining whether the revised knock pressure is less than the preset pressure threshold; if the revised knock pressure is greater than the preset pressure threshold, repeating the second adjusting step, the second obtaining step and the second determining step; and if the revised knock pressure is less than the preset pressure threshold, determining the decreased ignition advance angle as the target ignition advance angle. By adjusting the knock pressure, the adjustment of the current ignition advance angle of the engine is realized.

[0014] To achieve the above object, a second aspect of the present application provides an engine control system, comprising a processor and a memory connected to the processor, wherein the memory stores a computer program, and the processor loads the computer program to execute the method for calibrating the ignition advance angle of the engine as described in the above embodiments.

[0015] To achieve the above object, a third aspect of the present application provides a bench test device for calibrating the ignition advance angle of the engine, comprising: the engine control system as described in the above embodiments, wherein the engine control system is configured to generate an engine target working condition instruction; a bench control system connected to the engine control system, wherein the bench control system is configured to control the engine to adjust to a target working condition state according to the engine target working condition instruction; a combustion analysis system connected to the engine control system, wherein the combustion analysis system is configured to obtain a combustion pressure signal of the engine in operation and obtain a calibration reference parameter according to the combustion pressure signal; and the engine control system is further configured to determine a target ignition advance angle of the engine corresponding to the target working condition state according to the calibration reference parameter.

[0016] The bench test equipment for calibrating engine ignition advance angle according to the embodiment of the present application, the engine control system determines the target ignition advance angle of the engine corresponding to the target working condition according to the calibration reference parameter, realizes the automatic calibration of the engine ignition advance angle, does not need manual experimental scanning, avoids the influence of artificial factors on the calibration of the ignition advance angle, and improves the calibration rate and calibration precision.

[0017] In some embodiments, the bench test equipment for calibrating engine ignition advance angle further comprises an information exchange system connected with the bench control system, the combustion analysis system and the engine control system respectively.

[0018] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 is a block diagram of the bench test equipment for calibrating engine ignition advance angle according to one embodiment of the present application;

[0021] Figure 2 is a flow chart of the method for calibrating engine ignition advance angle according to one embodiment of the present application;

[0022] Figure 3 is a flow chart of the method for calibrating engine ignition advance angle according to one embodiment of the present application. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below with reference to the accompanying drawings, and the embodiments described with reference to the accompanying drawings are exemplary, and the embodiments of the present application are described in detail below.

[0024] The bench test equipment 1 is used for the calibration of an engine, as Figure 1 shown, is a block diagram of the bench test equipment for calibrating engine ignition advance angle according to one embodiment of the present application. The bench test equipment 1 comprises a bench control system 10, a combustion analysis system 11, an engine control system 12 and an information exchange system 13.

[0025] The test bench control system 10 comprises a dynamometer, an oil consumption meter and a control system, and the engine to be calibrated is connected to the dynamometer through a coupling during calibration. The combustion analysis system 11 comprises a combustion analyzer and a spark plug with a combustion pressure sensor, and the combustion analyzer and the spark plug with the combustion pressure sensor are used together, the spark plug with the combustion pressure sensor can replace the original spark plug of the engine to be calibrated, or a hole is punched on the wall of the combustion chamber to increase the spark plug with the combustion pressure sensor. The information exchange system 13 is connected to the test bench control system 10, the combustion analysis system 11 and the engine control system 12 respectively, and is used for information exchange among the three.

[0026] Specifically, the target working condition of the engine to be calibrated can be preset, and during calibration, the engine control system 12 is configured to generate and send an engine target working condition instruction; the test bench control system 10 is connected to the engine control system 12, and the test bench control system 10 is configured to control the engine to adjust to a target working condition state according to the engine target working condition instruction; the combustion analysis system 11 is connected to the engine control system 12, and the combustion analysis system 11 is configured to obtain a combustion pressure signal during engine operation and obtain a calibration reference parameter according to the combustion pressure signal; and the engine control system 12 is further configured to determine a target ignition advance angle of the engine corresponding to the target working condition state according to the calibration reference parameter, so as to realize automatic calibration of the ignition advance angle of the engine.

[0027] The method for calibrating the ignition advance angle of the engine is described below with reference to the accompanying drawings.

[0028] The method for calibrating the ignition advance angle of the engine is described below with reference to the accompanying drawings.

[0029] The method for calibrating the ignition advance angle of the engine is described below with reference to the accompanying drawings. Figures 2-3 The method for calibrating the ignition advance angle of the engine is described below with reference to the accompanying drawings.

[0030] As shown in Figure 2 The method for calibrating the ignition advance angle of the engine comprises at least steps S1, S2 and S3.

[0031] In step S1, an engine target working condition instruction is sent to make the engine operate in a target working condition state.

[0032] In an embodiment, the target working condition instruction is an instruction of the engine in a specific working condition, such as an acceleration working condition, an idling working condition, a small load working condition, and a large load working condition of the engine, and the engine control system sends an instruction of the target working condition of the engine, such as an acceleration working condition instruction, to the test bench control system, and the test bench control system adjusts the engine speed or the engine load according to the instruction, so that the engine operates in a target working condition state, such as an engine speed of 2000 rpm and an engine load of 30%. The information interaction between the engine control system and the test bench control system is realized through the information exchange system and the communication module.

[0033] In step S2, a calibration reference parameter obtained based on a combustion pressure signal in engine operation is acquired.

[0034] In an embodiment, the measurement of the combustion analysis system on the combustion pressure signal is based on the measurement of the in-cylinder combustion pressure signal by the spark plug type pressure sensor, and after the measurement is completed, the calibration reference parameter is obtained through the processing of the combustion analysis system. The combustion analysis system sends the obtained calibration reference parameter to the engine control system through the communication module, and the engine control system acquires the calibration reference parameter. The calibration reference parameter can be a knock pressure and a crank angle parameter corresponding to 50% of combustion.

[0035] In step S3, a target ignition advance angle of the engine corresponding to the target working condition state is determined according to the calibration reference parameter.

[0036] In an embodiment, whether the current ignition advance angle of the engine is the target ignition advance angle is determined by the calibration reference parameter, that is, whether the current ignition advance angle of the engine is in the best control state. It can be understood that when the current ignition advance angle of the engine is in the best control state, the calibration reference parameter, such as the knock pressure and the crank angle corresponding to 50% of combustion, is within the preset range, and at this time, the current ignition advance angle of the engine is the target ignition advance angle in the target working condition state.

[0037] When the current ignition advance angle of the engine is not in the best control state, the calibration reference parameter, such as the knock pressure and the crank angle corresponding to 50% of combustion, is not within the preset range, and the calibration reference parameter changes with the change of the current ignition advance angle of the engine. By adjusting the current ignition advance angle of the engine, until the calibration reference parameter, that is, the knock pressure and the crank angle corresponding to 50% of combustion, is within the preset range, it is determined that the current ignition advance angle of the engine is the target ignition advance angle.

[0038] According to the method for calibrating the engine ignition advance angle provided in the embodiments of the present application, the calibration reference parameter is obtained according to the combustion pressure signal in the engine operation, and the target ignition advance angle of the engine corresponding to the target working condition state is determined according to the calibration reference parameter, that is, the target ignition advance angle of the engine is determined through the calibration reference parameter, so that the automatic calibration of the engine ignition advance angle is realized, manual experimental scanning is not needed, the influence of human factors on the calibration of the target ignition advance angle is avoided, and the calibration rate and calibration precision are improved.

[0039] In some embodiments, the calibration reference parameter comprises the knock pressure and the crankshaft rotation angle corresponding to the 50% combustion, and when the target ignition advance angle of the engine corresponding to the target working condition state is determined according to the calibration reference parameter, the knock pressure and the crankshaft rotation angle corresponding to the 50% combustion are judged. When it is determined that the knock pressure is less than a preset pressure threshold and the crankshaft rotation angle corresponding to the 50% combustion falls within a preset angle range, the current ignition advance angle of the engine is determined as the target ignition advance angle. When it is determined that one or both of the knock pressure or the crankshaft rotation angle corresponding to the 50% combustion is not within the preset range, for example, the knock pressure is greater than or equal to the preset pressure threshold, or the crankshaft rotation angle corresponding to the 50% combustion does not fall within the preset angle range, or the knock pressure is greater than or equal to the preset pressure threshold and the crankshaft rotation angle corresponding to the 50% combustion does not fall within the preset angle range, it is indicated that the current ignition advance angle of the engine is not the target ignition advance angle. By taking the calibration reference parameter as the basis for judging whether the current ignition advance angle of the engine is the target ignition advance angle, the calibration accuracy is higher.

[0040] In some embodiments, when determining the engine target ignition advance angle according to the calibration reference parameter, in a first determination step of determining that the knock pressure is less than the preset pressure threshold and the crank angle corresponding to 50% of the combustion is not within the preset angle range, a first adjustment step of adjusting the current ignition advance angle of the engine, a first acquisition step of acquiring the revised crank angle corresponding to 50% of the combustion after adjusting the ignition advance angle of the engine, a first determination step of determining whether the revised crank angle is within the preset angle range, i.e. adjusting the current ignition advance angle of the engine, acquiring the revised crank angle corresponding to 50% of the combustion after adjusting the ignition advance angle, and determining the revised crank angle again, if the revised crank angle is not within the preset angle range, it indicates that the ignition advance angle of the engine after this adjustment is not the target ignition advance angle, then the first adjustment step, the first acquisition step and the first determination step are repeatedly executed, i.e. by continuously adjusting the ignition advance angle of the engine, acquiring the revised crank angle after adjustment, and determining the relationship between the revised crank angle and the preset angle range, the adjustment of the ignition advance angle of the engine is realized, until the revised crank angle is within the preset angle range, then the adjusted ignition advance angle is determined as the target ignition advance angle. By adjusting, acquiring and determining the current ignition advance angle of the engine according to the calibration reference parameter, the process is simple and the calibration accuracy is higher.

[0041] In some embodiments, the preset angle range includes a lower angle threshold, and the first adjustment step of adjusting the current ignition advance angle of the engine, i.e. when the knock pressure is less than the preset pressure threshold, and the crank angle corresponding to 50% of the combustion is less than the lower angle threshold, the current ignition advance angle is reduced by a first preset angle amplitude, i.e. the current ignition advance angle is reduced by a gradient of 0.5 degrees, until the crank angle corresponding to 50% of the combustion is increased to the preset angle threshold. It can be understood that reducing the current ignition advance angle by a first preset angle amplitude, for example 0.5 degrees, can increase the crank angle corresponding to 50% of the combustion, i.e. when the knock pressure is less than the preset pressure threshold, reducing the current ignition advance angle of the engine can increase the crank angle corresponding to 50% of the combustion, so that the knock pressure and the crank angle corresponding to 50% of the combustion both meet the set conditions, and the automatic calibration of the ignition advance angle of the engine is realized.

[0042] In some embodiments, the preset angle range comprises an upper limit angle threshold, the first adjustment step of adjusting the current ignition advance angle of the engine, i.e. when the crankshaft rotation angle corresponding to the combustion 50% is greater than the upper limit angle threshold, the current ignition advance angle is increased by a second preset angle amplitude in the case that the knock pressure is less than the preset pressure threshold, i.e. the current ignition advance angle is increased by a gradient of 0.5 degrees until the crankshaft rotation angle corresponding to the combustion 50% is reduced to the preset angle threshold. It can be understood that the current ignition advance angle is increased by a first preset angle amplitude, e.g. 0.5 degrees, which can reduce the crankshaft rotation angle corresponding to the combustion 50%, i.e. in the case that the knock pressure is greater than the preset pressure threshold, increasing the current ignition advance angle can reduce the crankshaft rotation angle corresponding to the combustion 50%, so that the knock pressure and the crankshaft rotation angle corresponding to the combustion 50% both satisfy the set conditions, and the automatic calibration of the engine ignition advance angle is realized.

[0043] In some embodiments, when determining the target ignition advance angle of the engine corresponding to the target working condition state according to the calibration reference parameter, the second determination step of determining that the knock pressure is greater than the preset pressure threshold, i.e. when the knock pressure is greater than the preset pressure threshold, the crankshaft rotation angle corresponding to the combustion 50% should be greater than the preset angle threshold, i.e. the crankshaft rotation angle corresponding to the combustion 50% is 9 degrees or 10 degrees, the second adjustment step of reducing the current ignition advance angle by a third preset angle amplitude, the second acquisition step of acquiring the revised knock pressure of the engine after adjusting the ignition advance angle, the second determination step of determining whether the revised knock pressure is less than the preset pressure threshold, i.e. the current ignition advance angle is reduced by a gradient of 0.5 degrees, the knock pressure is reduced by reducing the current ignition advance angle, and after adjusting the ignition advance angle of the engine, the revised knock pressure corresponding to the adjusted ignition advance angle of the engine is acquired, and it is determined whether the revised knock pressure is less than the preset pressure threshold. If the revised knock pressure is still greater than the preset pressure threshold, it indicates that the ignition advance angle of the engine after this adjustment is not the target ignition advance angle, and the second adjustment step, the second acquisition step and the second determination step need to be repeatedly executed, i.e. the ignition advance angle of the engine is continuously adjusted, the corresponding revised knock pressure is acquired after the adjustment is completed, and the relationship between the knock pressure and the preset pressure threshold is continuously determined, until it is determined that the revised knock pressure is less than the preset pressure threshold, and then it is determined that the reduced ignition advance angle is the target ignition advance angle. By reducing the current ignition advance angle, the knock pressure is adjusted to be within the preset pressure threshold range, and the automatic calibration of the engine ignition advance angle is realized.

[0044] The calibration method of the engine ignition advance angle according to the embodiments of the present application will be described below. Figure 3 The calibration method of the engine ignition advance angle according to the embodiments of the present application will be described below. Figure 3 As shown in the figure, it is a flow chart of the calibration method of the engine ignition advance angle according to the embodiments of the present application.

[0045] Step S11, start.

[0046] Step S12, the engine control system sends the engine target working condition instruction to the test bench control system through the communication module and the information exchange system.

[0047] Step S13, the engine control system controls the engine to operate in the target working condition state.

[0048] Step S14, the engine control system receives the calibration reference parameter processed by the combustion analysis system.

[0049] Step S15, it is judged whether the calibration reference parameter satisfies the set condition, if yes, step S17 is executed; if no, step S16 is executed.

[0050] Step S16, the current ignition advance angle of the engine is adjusted according to the calibration reference parameter.

[0051] Step S17, the engine control system judges whether the next working condition engine ignition advance angle is adjusted, if yes, step S12 is executed, if no, step S18 is executed.

[0052] Step S18, the end.

[0053] In summary, according to the method for calibrating the engine ignition advance angle provided by the embodiment of the present application, the calibration reference parameter is obtained according to the combustion pressure signal in the engine operation, and the target ignition advance angle of the engine corresponding to the target working condition state is determined according to the calibration reference parameter, that is, the target ignition advance angle of the engine is determined through the calibration reference parameter, so that the automatic calibration of the engine ignition advance angle is realized, manual experimental scanning is not needed, the influence of the artificial factors on the calibration of the target ignition advance angle is avoided, and the calibration rate and the calibration precision are improved.

[0054] The engine control system of the second embodiment of the present application comprises a processor and a memory connected with the processor, the memory stores a computer program, the processor loads the computer program to execute the method for calibrating the engine ignition advance angle mentioned in the above embodiment.

[0055] In addition, according to the test bench test equipment 1 for calibrating the engine ignition advance angle provided by the embodiment of the present application, the engine control system 12 determines the target ignition advance angle of the engine corresponding to the target working condition according to the calibration reference parameter, realizes the automatic calibration of the engine ignition advance angle, does not need manual experimental scanning, avoids the influence of the artificial factors on the calibration of the ignition advance angle, and improves the calibration rate and the calibration precision.

[0056] In the description of the specification, reference to "one embodiment", "some embodiments", "an exemplary embodiment", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "in some embodiments", "in an exemplary embodiment", "an example", "a specific example", or "some examples" in various places in the specification are not necessarily referring to the same embodiment or example.

[0057] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to these embodiments. Rather, it is the intention that modifications, changes, substitutions, and variations be made to the embodiments disclosed herein without departing from the spirit and scope of the application, which is defined solely by the claims and their equivalents.

Claims

1. A method of calibrating an engine spark advance angle, characterized by, The method comprises: sending an engine target operating condition instruction to make the engine operate in a target operating condition state; obtaining a calibration reference parameter obtained based on a combustion pressure signal in the engine operation; determining a target ignition advance angle of the engine corresponding to the target operating condition state according to the calibration reference parameter; wherein the calibration reference parameter comprises a knock pressure and a crank angle corresponding to 50% of combustion, and the determination of the target ignition advance angle of the engine corresponding to the target operating condition state according to the calibration reference parameter comprises: when it is determined that the knock pressure is less than a preset pressure threshold and the crank angle corresponding to 50% of combustion falls within a preset angle range, determining that a current ignition advance angle of the engine is the target ignition advance angle; when it is determined that the knock pressure is less than the preset pressure threshold and the crank angle corresponding to 50% of combustion does not fall within the preset angle range, adjusting the current ignition advance angle of the engine to obtain a revised crank angle, and determining the target ignition advance angle through iteration according to a relationship between the revised crank angle and the preset angle range; when it is determined that the knock pressure is greater than the preset pressure threshold, adjusting the current ignition advance angle of the engine, obtaining a revised knock pressure corresponding to the adjusted engine ignition advance angle, and adjusting in a loop until the knock pressure is less than the preset pressure threshold according to a relationship between the revised knock pressure and the preset pressure threshold, and then determining the target ignition advance angle.

2. The method of calibrating an engine spark advance angle according to claim 1, characterized by, The determination of the target ignition advance angle of the engine corresponding to the target operating condition state according to the calibration reference parameter further comprises: a first determination step of determining that the knock pressure is less than the preset pressure threshold and the crank angle corresponding to 50% of combustion does not fall within the preset angle range; a first adjustment step of adjusting the current ignition advance angle of the engine; a first obtaining step of obtaining a revised crank angle corresponding to 50% of combustion after adjusting the ignition advance angle of the engine; a first judgment step of judging whether the revised crank angle falls within the preset angle range; if the revised crank angle does not fall within the preset angle range, repeatedly executing the first adjustment step, the first obtaining step and the first judgment step; if the revised crank angle falls within the preset angle range, determining that the adjusted ignition advance angle is the target ignition advance angle; the preset angle range comprises a lower angle threshold, and the first adjustment step of adjusting the current ignition advance angle of the engine comprises: when it is determined that the crank angle corresponding to 50% of combustion is less than the lower angle threshold, decreasing the current ignition advance angle by a first preset angle amplitude; and the preset angle range comprises an upper angle threshold, and the first adjustment step of adjusting the current ignition advance angle of the engine comprises: when it is determined that the crank angle corresponding to 50% of combustion is greater than the upper angle threshold, increasing the current ignition advance angle by a second preset angle amplitude.

3. The method of calibrating engine spark advance according to claim 1, wherein, The determination of the target ignition advance angle of the engine corresponding to the target operating condition state according to the calibration reference parameter further comprises: a second determining step of determining whether the knock pressure is greater than the preset pressure threshold value; a second adjusting step of reducing the current ignition advance angle by a third preset angle range; a second obtaining step of obtaining a revised knock pressure of the engine after adjusting the ignition advance angle; a second determining step of determining whether the revised knock pressure is less than the preset pressure threshold value; if the revised knock pressure is greater than the preset pressure threshold value, repeatedly performing the second adjusting step, the second obtaining step and the second determining step; if the revised knock pressure is less than the preset pressure threshold value, determining the reduced ignition advance angle as the target ignition advance angle.

4. An engine control system characterized by comprising: An engine control system comprising a processor and a memory connected to the processor, the memory storing a computer program, and the processor loading the computer program to execute the method for calibrating the ignition advance angle of the engine according to any one of claims 1-3.

5. A test bed apparatus for calibrating an engine spark advance angle, characterized by, comprising: The engine control system of claim 4, wherein the engine control system is configured to generate engine target operating condition instructions; a test bench control system connected to the engine control system, wherein the test bench control system is configured to control the engine to adjust to a target operating condition state according to the engine target operating condition instructions; a combustion analysis system connected to the engine control system, wherein the combustion analysis system is configured to obtain a combustion pressure signal of the engine in operation and obtain a calibration reference parameter according to the combustion pressure signal; The engine control system is further configured to determine a target ignition advance angle of the engine corresponding to the target operating condition state according to the calibration reference parameter; wherein the calibration reference parameter comprises a knock pressure and a crank angle corresponding to 50% of the combustion, and the determination of the target ignition advance angle of the engine corresponding to the target operating condition state according to the calibration reference parameter comprises: when it is determined that the knock pressure is less than the preset pressure threshold value and the crank angle corresponding to 50% of the combustion falls within a preset angle range, determining the current ignition advance angle of the engine as the target ignition advance angle; when it is determined that the knock pressure is less than the preset pressure threshold value and the crank angle corresponding to 50% of the combustion does not fall within the preset angle range, adjusting the current ignition advance angle of the engine to obtain a revised crank angle, and determining the target ignition advance angle through iteration according to the relationship between the revised crank angle and the preset angle range; when it is determined that the knock pressure is greater than the preset pressure threshold value, adjusting the current ignition advance angle of the engine to obtain a revised knock pressure corresponding to the adjusted ignition advance angle of the engine, and adjusting in a loop until the knock pressure is less than the preset pressure threshold value according to the relationship between the revised knock pressure and the preset pressure threshold value, and then determining the target ignition advance angle.

6. The test bed apparatus for calibrating the spark advance angle of an engine according to claim 5, characterized by Further comprising: an information exchange system connected to the test bench control system, the combustion analysis system and the engine control system, respectively.

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