VGT opening calibration method for hydrogen internal combustion engine

Abstract

The invention relates to the field of hydrogen internal combustion engines, in particular to a VGT opening calibration method for a hydrogen internal combustion engine. The method comprises the steps that the rotating speed, the initial average effective pressure and the initial VGT opening degree of the hydrogen internal combustion engine are determined and calibrated; the average effective pressure is increased, the VGT opening degree is adjusted, and when the first preset excess air coefficient is determined, the first calibrated VGT opening degree is obtained; the average effective pressure is increased, the VGT opening degree is adjusted, and when it is determined that the average effective pressure is smaller than the first preset excess air coefficient and the air inlet pressure is not smaller than 2 bar, the second calibrated VGT opening degree is obtained; determining a preset number of VGT opening values based on the second calibrated VGT opening; when it is determined that the highest effective heat efficiency corresponding to the preset number of VGT opening values is a second calibrated VGT opening and is smaller than a second preset excess air coefficient, VVT setting is switched; and the average effective pressure is increased, the VGT opening degree is adjusted, and when it is determined that the hydrogen internal combustion engine has the abnormal combustion phenomenon, the third calibrated VGT opening degree is obtained. Different loads are considered, and the VGT opening degree under the full working condition of the hydrogen internal combustion engine can be calibrated.

Description

Technical Field

[0001] The present invention relates to the field of hydrogen internal combustion engines, and in particular to a method for calibrating the VGT opening of a hydrogen internal combustion engine. Background Art

[0002] To combat the greenhouse effect and environmental pollution, countries around the world are researching ways to utilize renewable energy, such as new renewable fuels like hydrogen, ammonia, and methanol. my country is also leading innovation in green energy technologies. Hydrogen, due to its carbon-free nature, high calorific value, and high octane rating, is a highly attractive energy source and is expected to play a significant role in future energy mix and carbon emission reduction. In recent years, researchers worldwide have also been actively engaged in the development of hydrogen internal combustion engines.

[0003] Due to the lower volumetric energy density of hydrogen, the power output of hydrogen internal combustion engines is lower than that of gasoline engines. As the current requirements for hydrogen engine power performance become increasingly stringent, more necessary technologies need to be adopted to increase output power.

[0004] Turbocharging is currently the primary method for increasing the power output of hydrogen internal combustion engines. However, previous studies have shown that conventional turbochargers for gasoline engines do not work well on hydrogen internal combustion engines. First, due to low exhaust temperatures and lean combustion at low engine speeds, conventional turbochargers for gasoline engines cannot maintain the energy required to provide the required boost. In addition, the high back pressure and pumping losses of conventional turbochargers limit the increase in power output of hydrogen internal combustion engines. Compared to the wastegate turbochargers (WGTs) used in traditional gasoline engines, variable geometry turbochargers (VGTs) are more suitable for boost matching in hydrogen internal combustion engines due to their wider flow range.

[0005] Previous research has shown that VGT turbochargers with a wide flow range offer significant advantages for hydrogen internal combustion engines. Hydrogen internal combustion engines regulate boost pressure across the entire operating range by adjusting the vane opening in the VGT turbocharger. To achieve high power and high thermal efficiency across the entire operating range of hydrogen internal combustion engines, a calibration scheme for controlling the VGT opening in hydrogen internal combustion engines across this range is necessary. Summary of the Invention

[0006] In view of the above problems in the prior art, the present application provides a hydrogen internal combustion engine VGT opening calibration method, which can calibrate the VGT opening of the hydrogen internal combustion engine under all working conditions, and consider the effective thermal efficiency under different loads to obtain the optimal VGT opening calibration.

[0007] The method for calibrating the VGT opening of a hydrogen internal combustion engine provided in this application comprises the following steps:

[0008] N1: Determine the calibrated hydrogen internal combustion engine speed, initial mean effective pressure and initial VGT opening;

[0009] N2: Increase the mean effective pressure and adjust the VGT opening. When the excess air coefficient is determined to be the first preset excess air coefficient, a first calibrated VGT opening is obtained.

[0010] N3: increasing the mean effective pressure and adjusting the VGT opening; when it is determined that the excess air coefficient is less than the first preset excess air coefficient and the intake pressure is not less than 2 bar, obtaining a second calibrated VGT opening;

[0011] N4: Based on the second calibrated VGT opening, determining a preset number of VGT opening values according to a preset difference;

[0012] N5: When it is determined that the highest effective thermal efficiency corresponding to the preset number of VGT opening values is the second calibrated VGT opening and the excess air coefficient is less than the second preset excess air coefficient, switching the VVT setting;

[0013] N6: increasing the mean effective pressure and adjusting the VGT opening; when it is determined that the hydrogen internal combustion engine has an abnormal combustion phenomenon, obtaining a third calibrated VGT opening.

[0014] This implementation utilizes targeted settings for different engine loads, increasing mean effective pressure while maintaining an optimal excess air coefficient at low and medium loads, fully accounting for pumping losses and effective thermal efficiency. At high loads, the excess air coefficient and abnormal combustion phenomena are carefully considered to calibrate the optimal VGT opening under all operating conditions of the hydrogen engine. Furthermore, switching the VVT setting allows for a rapid increase in air flow in the hydrogen engine, avoiding abnormal combustion caused by a low excess air coefficient.

[0015] In some embodiments, the increasing the mean effective pressure and adjusting the VGT opening, when determining that the hydrogen internal combustion engine has abnormal combustion, to obtain a third calibrated VGT opening, includes:

[0016] When abnormal combustion occurs in the hydrogen internal combustion engine with increased mean effective pressure, the VGT opening is increased;

[0017] When it is determined that abnormal combustion occurs after increasing the VGT opening, the third calibrated VGT opening is obtained.

[0018] In this embodiment, the VGT opening of the hydrogen internal combustion engine is adjusted to avoid abnormal combustion phenomena that occur when the mean effective pressure is increased, thereby ensuring the normal operation of the hydrogen internal combustion engine.

[0019] In some embodiments, when the mean effective pressure is increased and abnormal combustion occurs in the hydrogen internal combustion engine, after increasing the VGT opening, the method further includes:

[0020] The mean effective pressure is increased, and when it is determined that the hydrogen internal combustion engine does not have abnormal combustion, a fourth calibrated VGT opening is obtained.

[0021] In this embodiment, the VGT opening is gradually increased and changes in the combustion phenomenon are observed to ultimately determine a calibrated VGT opening for normal operation of the hydrogen internal combustion engine.

[0022] In some embodiments, the initial VGT opening is 100%.

[0023] In this embodiment, the initial VGT opening is set to 100%, so that the VGT opening is fully opened under low load to reduce pumping loss.

[0024] In some embodiments, the first preset excess air coefficient satisfies a threshold value of 2.2 to 2.4; and the second preset excess air coefficient is 2.

[0025] In this embodiment, by maintaining a preset air coefficient, balancing the effects of pumping loss and excess air coefficient on effective thermal efficiency, and comparing the performance of different VGT openings under increasing mean effective pressure to medium load, the optimal VGT opening setting is obtained.

[0026] In some embodiments, determining a preset number of VGT opening values according to a preset difference based on the second calibrated VGT opening includes:

[0027] Based on the second calibrated VGT opening, 5% values are interpolated forward and backward to obtain three sets of VGT opening values.

[0028] In this embodiment, the optimal VGT opening setting for a hydrogen internal combustion engine with high thermal efficiency is obtained by comparing multiple groups of interpolated values before and after the second calibrated VGT opening.

[0029] In some embodiments, further comprising:

[0030] A second calibrated hydrogen internal combustion engine speed is determined, and based on the method described in steps N2 to N6, the hydrogen internal combustion engine VGT opening is calibrated at the second calibrated hydrogen internal combustion engine speed.

[0031] In this embodiment, the VGT opening can be calibrated for different speeds and different load operating points, and the VGT boost opening calibration for high power performance and high thermal efficiency of the hydrogen internal combustion engine can be achieved.

[0032] These and other aspects of the invention will be apparent from and elucidated with reference to the following description of the embodiment(s). BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The following further illustrates the various features of the present invention and the relationships between the various features with reference to the accompanying drawings. The accompanying drawings are all exemplary, and some features are not shown in actual proportion. In addition, some drawings may omit features that are customary in the field to which this application relates and are not necessary for this application, or additional features that are not necessary for this application may be shown. The combination of the various features shown in the accompanying drawings is not intended to limit this application. In addition, throughout this specification, the same reference numerals refer to the same content. The specific description of the drawings is as follows:

[0034] Figure 1 Schematic diagram of the system structure for VGT opening calibration of a hydrogen internal combustion engine provided in an embodiment of the present application;

[0035] Figure 2 1 is a flow chart of a method for calibrating the VGT opening of a hydrogen internal combustion engine provided in an embodiment of the present application;

[0036] Figure 3 1 is a schematic diagram of a flow chart for VGT opening calibration of a hydrogen internal combustion engine provided in an embodiment of the present application;

[0037] Figure 4 2 is a flow chart of a method for calibrating the VGT opening of a hydrogen internal combustion engine provided by another embodiment of the present application;

[0038] Figure 5 This is an example diagram of the VGT opening calibration results of a hydrogen internal combustion engine provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solution provided by this application is further described below with reference to the accompanying drawings and examples. It should be understood that the system structure and business scenarios provided in the examples of this application are mainly for illustrating possible implementation methods of the technical solution of this application and should not be interpreted as the sole limitation of the technical solution of this application. It is known to those skilled in the art that with the evolution of the system structure and the emergence of new business scenarios, the technical solution provided by this application is also applicable to similar technical problems.

[0040] It should be understood that the hydrogen internal combustion engine VGT opening calibration solution provided in the embodiments of the present application includes a hydrogen internal combustion engine VGT opening calibration method, etc. Because the technical solutions of the embodiments of the present application solve the same or similar problems, some repetitions may not be repeated in the following description of the specific embodiments. However, these specific embodiments should be considered as having been referenced and can be combined with each other.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. In the event of any inconsistency, the meanings described in this specification or the meanings derived from the contents recorded in this specification shall prevail. In addition, the terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application. In order to accurately describe the technical content in this application and to accurately understand the present invention, the following explanations or definitions are given for the terms used in this specification before describing the specific embodiments:

[0042] 1) Variable Geometry Turbocharger (VGT): A turbocharger used in internal combustion engines that precisely controls the engine's air intake and boost pressure by adjusting the turbine's geometry.

[0043] like Figure 1 As shown in the figure, the hydrogen engine VGT opening calibration system primarily consists of a direct-injection hydrogen internal combustion engine and its test system, specifically including the direct-injection hydrogen internal combustion engine 1, hydrogen nozzle 2, hydrogen flowmeter 3, dynamometer 4, VGT supercharger 5, and hydrogen internal combustion engine ECU 6. The main parameters adjusted during calibration control are the injection pulse width t of the hydrogen nozzle 2 (in milliseconds); the opening θ of the VGT supercharger 5 (in percent); and the speed n of the hydrogen internal combustion engine 1 (in r / min).

[0044] Please refer to Figure 2 , Figure 2 : is a flow chart of a method for calibrating the VGT opening of a hydrogen internal combustion engine provided in an embodiment of the present application. The steps of the method for calibrating the VGT opening of a hydrogen internal combustion engine provided in this embodiment include:

[0045] N1: Determine the calibrated hydrogen internal combustion engine speed, initial mean effective pressure and initial VGT opening.

[0046] first Figure 1 The dynamometer 4 sets the initial calibrated hydrogen internal combustion engine speed and the initial calibrated mean effective pressure. The hydrogen internal combustion engine ECU 5 also sets the initial VGT opening and initial injection pulse width. The mean effective pressure describes the engine load, and increasing the mean effective pressure can be achieved by increasing the injection pulse width. During testing, the initial VGT opening can be set to 100%. Under low loads, the VGT opening should be fully open to reduce pumping losses. In this embodiment, the mean effective pressure should be gradually increased in 0.05 MPa intervals until abnormal combustion occurs at that speed.

[0047] N2: Increase the mean effective pressure and adjust the VGT opening. When the excess air coefficient is determined to be the first preset excess air coefficient, a first calibrated VGT opening is obtained.

[0048] As mean effective pressure increases, the load increases. To minimize pumping losses and achieve high thermal efficiency for hydrogen internal combustion engines, it's necessary to compare the excess air coefficient under these operating conditions. The excess air coefficient can be determined based on the specific combustion system and application requirements. A first preset excess air coefficient can be 2.2-2.4. If the excess air coefficient falls within this range, a first calibrated VGT opening is determined. This first calibrated VGT opening represents the VGT opening under low and medium loads. If it exceeds 2.4, the VGT opening is maintained at 100%.

[0049] N3: Increase the mean effective pressure and adjust the VGT opening. When it is determined that the excess air coefficient is less than the first preset excess air coefficient and the intake pressure is not less than 2 bar, obtain a second calibrated VGT opening.

[0050] Continue increasing the injection pulse width to increase the mean effective pressure, or in other words, the engine load. As the load increases, the excess air coefficient decreases. At the current operating point, an excess air coefficient between 2.2 and 2.4 achieves ideal lean burn, which helps improve the indicated thermal efficiency. Based on the aforementioned conditions, the intake pressure at this point is generally between 2 and 8 bar. When the intake pressure under this operating condition is no less than 2 bar, the second calibrated VGT opening is obtained, representing the VGT opening under medium and high loads.

[0051] N4: Based on the second calibrated VGT opening, determine a preset number of VGT opening values according to the preset difference.

[0052] After completing the second calibrated VGT opening characterizing medium and high loads, the VGT opening calibration of the hydrogen internal combustion engine under medium and high loads can be started. Taking the second calibrated VGT opening as the benchmark, the preset number of VGT opening values are determined by interpolation forward and backward, and the effective thermal efficiency of the hydrogen internal combustion engine under the three VGT opening value settings is compared under the same load.

[0053] N5: When it is determined that the highest effective thermal efficiency corresponding to the preset number of VGT opening values is the second calibrated VGT opening and the excess air coefficient is less than the second preset excess air coefficient, the VVT setting is switched.

[0054] If the effective thermal efficiency is highest at the second calibrated VGT opening under medium-to-high load conditions, then this VGT opening is calibrated. In addition, if a VGT opening value with the highest effective thermal efficiency exists among the preset number of VGT opening values, then this step is repeated based on the VGT opening corresponding to the highest thermal efficiency to compare and determine the optimal VGT opening under these operating conditions.

[0055] When a hydrogen internal combustion engine operates under high load conditions, its primary concern is power performance, which requires increased air flow. When the excess air coefficient is less than the second preset excess air coefficient 2, switching the VVT setting allows for a rapid increase in the hydrogen internal combustion engine's air flow, avoiding abnormal combustion caused by the low excess air coefficient.

[0056] N6: Increase the mean effective pressure and adjust the VGT opening. When it is determined that abnormal combustion occurs in the hydrogen internal combustion engine, obtain a third calibrated VGT opening.

[0057] When abnormal combustion occurs, the VGT opening is gradually increased to reduce the pumping loss of the hydrogen internal combustion engine and at the same time reduce the residual exhaust gas coefficient in the cylinder, thereby alleviating the abnormal combustion of the hydrogen internal combustion engine.

[0058] Then, gradually increase the load on the hydrogen internal combustion engine to obtain a third calibrated VGT opening. If abnormal combustion still occurs after increasing the VGT opening, complete the VGT opening calibration for the full load at that speed. Repeat this step to determine the VGT opening calibration for this operating condition without abnormal combustion.

[0059] In some embodiments, after completing the above-mentioned initial calibration of the hydrogen internal combustion engine speed VGT opening calibration, the direct injection hydrogen internal combustion engine speed can be adjusted by controlling the dynamometer, and the VGT opening calibration can be continued for the next target hydrogen internal combustion engine speed.

[0060] In this embodiment, by making targeted settings for different internal combustion engine loads, the mean effective pressure is increased and the optimal excess air coefficient is maintained at medium and low loads, fully considering the pumping loss and effective thermal efficiency; at high loads, attention is paid to the excess air coefficient and abnormal combustion phenomena, and the optimal VGT opening under all working conditions of the hydrogen internal combustion engine is obtained for calibration.

[0061] The following is a further introduction to the method provided by this application in conjunction with a specific implementation method. Figures 3 and 4 , Figure 3 This is a schematic diagram of the calibration process provided in the embodiment of the present application; Figure 4 The flow chart of the method for calibrating the VGT opening of a hydrogen internal combustion engine provided in the embodiment of the present application is as follows. The method for calibrating the VGT opening of a hydrogen internal combustion engine provided in this embodiment includes the following steps:

[0062] S101: Initial condition setting.

[0063] First, the dynamometer 4 sets the initial calibration speed n1, starting with an initial calibration mean effective pressure of 0.2 MPa. Simultaneously, the hydrogen internal combustion engine ECU 5 sets the initial VGT opening to 100% and the initial injection pulse width. At each speed, the full-load calibration mean effective pressure should be gradually increased in 0.05 MPa increments until abnormal combustion occurs at that speed.

[0064] The load (mean effective pressure) BMEP1 of the hydrogen internal combustion engine at the current operating point is calculated by [Equation 1]:

[0065]

[0066] In formula 1, V is the displacement of a single cylinder of the hydrogen internal combustion engine; i is the number of cylinders of the hydrogen internal combustion engine, n1 is the initial calibrated speed, and P1 is the power of the hydrogen internal combustion engine.

[0067] S102: Low-load VGT opening calibration.

[0068] The hydrogen internal combustion engine gradually increases the load by increasing the injection pulse width. In order to minimize the pumping loss, the excess air coefficient of the working condition is compared. If it is greater than 2.4, the VGT opening θ is maintained at 100%. A .

[0069] S103: Low and medium load VGT opening calibration.

[0070] As the load increases to medium and low loads, the excess air coefficient decreases. When the excess air coefficient at the current operating point is between 2.2-2.4, a relatively ideal lean combustion can be achieved, which is conducive to improving the indicated thermal efficiency. When this condition is met, the VGT opening θ under this operating condition can be calibrated. B .

[0071] The injection pulse width increases, and the excess air coefficient further decreases. Compare whether the excess air coefficient under this operating condition is less than 2.2. If it is not satisfied, return to the previous step to complete the calibration of the low and medium load VGT opening.

[0072] S104: Medium and high load VGT opening calibration.

[0073] In order to avoid a rapid decrease in the excess air coefficient due to an excessively large injection pulse width, the intake pressure needs to be measured. The intake pressure under medium and high loads is generally greater than 2 bar. If it is not satisfied, it is necessary to return to the previous step to continue to complete the calibration of medium and low loads.

[0074] If the above conditions are met, the VGT opening calibration under medium and high load of hydrogen internal combustion engine will start, with the current VGT opening as θ C Benchmark, interpolation 5% before and after the value of θ C1 and θ C2, and compare the effective thermal efficiency BTE1 of the hydrogen internal combustion engine under three VGT opening settings under the same load.

[0075] If under this condition θ C The effective thermal efficiency is the highest under the opening, so the VGT opening is calibrated; if θ C1 or θ C2 If the effective thermal efficiency is the highest under the opening, repeat this step based on the VGT opening corresponding to the highest thermal efficiency to compare and find the optimal VGT opening under this working condition.

[0076] The effective thermal efficiency BTE1 of the hydrogen internal combustion engine at the current operating point is calculated by [Equation 2], in %. Since water vapor is generated after combustion, the low calorific value of hydrogen is 120MJ / kg:

[0077]

[0078] Among them, P1 is the power of the hydrogen internal combustion engine, is the hydrogen mass flow rate, unit is kg / h.

[0079] S105: High-load VGT opening calibration.

[0080] The VGT opening is calibrated for high-load conditions in hydrogen internal combustion engines. When operating under high-load conditions, the primary concern is power performance, which requires increased air flow. By switching the VVT setting, the air flow in the hydrogen internal combustion engine can be rapidly increased, and the excess air coefficient increases accordingly, avoiding abnormal combustion caused by a low excess air coefficient. As the injection pulse width increases further, the excess air coefficient decreases. On the premise that abnormal combustion does not occur at all loads, the VGT opening θ is calibrated for this operating condition. D .

[0081] When abnormal combustion occurs, gradually increase the VGT opening to reduce the pumping loss of the hydrogen internal combustion engine and reduce the residual exhaust gas coefficient in the cylinder, thereby alleviating the abnormal combustion of the hydrogen internal combustion engine. Then gradually increase the load of the hydrogen internal combustion engine and calibrate the VGT opening θ corresponding to this working condition. E If abnormal combustion still occurs after increasing the VGT opening, complete the VGT opening calibration at full load at that speed.

[0082] S106: VGT opening calibration for other speed conditions.

[0083] Based on steps S101-S103, calibration continues for other speed conditions. By controlling the dynamometer, the engine speed is adjusted to n2. The initial mean effective pressure and VGT opening remain the same as above, and the calibration process repeats the previous steps. By calibrating the VGT opening at different speeds and loads using this calibration method, high power performance and thermal efficiency can be achieved for VGT-supercharged hydrogen internal combustion engines.

[0084] By adjusting the VGT opening to increase the intake pressure or reduce the pump loss, the test results after calibration using this method are as follows: Figure 5 As shown in the figure, it can be found that the effective thermal efficiency, maximum output torque and power obtained by this calibration method are significantly improved at low and high speed stages, while the variation range of the excess air coefficient is relatively small.

[0085] In the above description, the numbers representing the steps, such as S110, S120, etc., do not necessarily mean that the steps must be executed in this manner. If permitted, the order of the steps can be interchanged or they can be executed simultaneously.

[0086] The term "comprising" as used in the specification and claims should not be construed as limiting to what is listed thereafter; it does not exclude other elements or steps. Thus, it should be interpreted as specifying the presence of the features, integers, steps, or components mentioned, but not excluding the presence or addition of one or more other features, integers, steps, or components, or groups thereof. Thus, the expression "a device comprising means A and B" should not be limited to a device consisting solely of components A and B.

[0087] References in this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Therefore, the phrases "in one embodiment" or "in an embodiment" appearing throughout this specification do not necessarily refer to the same embodiment, but may refer to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics can be combined in any suitable manner, as would be apparent to one of ordinary skill in the art from this disclosure.

[0088] Note that the above are only preferred embodiments of the present application and the technical principles employed. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of protection of the present application, all of which fall within the scope of protection of the present application.

Claims

1. A method for calibrating the VGT opening of a hydrogen internal combustion engine, characterized in that: The method for calibrating the VGT opening of a hydrogen internal combustion engine comprises the following steps: N1: Determine the calibrated hydrogen internal combustion engine speed, initial mean effective pressure and initial VGT opening; N2: Increase the mean effective pressure and adjust the VGT opening. When the excess air coefficient is determined to be the first preset excess air coefficient, a first calibrated VGT opening is obtained. N3: increasing the mean effective pressure and adjusting the VGT opening; when it is determined that the excess air coefficient is less than the first preset excess air coefficient and the intake pressure is not less than 2 bar, obtaining a second calibrated VGT opening; N4: Based on the second calibrated VGT opening, determining a preset number of VGT opening values according to a preset difference; N5: When it is determined that the highest effective thermal efficiency corresponding to the preset number of VGT opening values is the second calibrated VGT opening and the excess air coefficient is less than the second preset excess air coefficient, switching the VVT setting; N6: increasing the mean effective pressure and adjusting the VGT opening; when it is determined that the hydrogen internal combustion engine has an abnormal combustion phenomenon, obtaining a third calibrated VGT opening.

2. The method according to claim 1, characterized in that The increasing the mean effective pressure and adjusting the VGT opening, when determining that the hydrogen internal combustion engine has an abnormal combustion phenomenon, obtaining a third calibrated VGT opening, includes: When abnormal combustion occurs in the hydrogen internal combustion engine with increased mean effective pressure, the VGT opening is increased; When it is determined that abnormal combustion occurs after increasing the VGT opening, the third calibrated VGT opening is obtained.

3. The method according to claim 2, characterized in that When abnormal combustion occurs in the hydrogen internal combustion engine with increased mean effective pressure, after increasing the VGT opening, the method further includes: The mean effective pressure is increased, and when it is determined that the hydrogen internal combustion engine does not have abnormal combustion, a fourth calibrated VGT opening is obtained.

4. The method according to claim 1, wherein The initial VGT opening is 100%.

5. The method according to claim 1, wherein The first preset excess air coefficient meets a threshold value of 2.2 to 2.4; the second preset excess air coefficient is 2.

6. The method according to claim 1, characterized in that The step of determining a preset number of VGT opening values according to a preset difference based on the second calibrated VGT opening includes: Based on the second calibrated VGT opening, 5% values are interpolated forward and backward to obtain three sets of VGT opening values.

7. The method according to any one of claims 1 to 6, characterized in that Also includes: A second calibrated hydrogen internal combustion engine speed is determined, and based on the method described in steps S2 to S6, the hydrogen internal combustion engine VGT opening is calibrated at the second calibrated hydrogen internal combustion engine speed.

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