A hydrogen engine exhaust measurement device, performance diagnosis method and system

Abstract

The present application relates to the field of engine technology, and provides a hydrogen engine exhaust gas measurement device, performance diagnosis method and system; the device comprises: an exhaust module and an exhaust collecting device; a plurality of first pipes are evenly arranged on one side of the exhaust module; one side of each first pipe is connected to an exhaust collecting device; each exhaust collecting device comprises: an exhaust collecting pipe connected to one side of the first pipe, and electromagnetic control valves arranged at both ends of the exhaust collecting pipe; the method comprises: respectively obtaining air-fuel ratio data of each cylinder of the engine within a preset combustion time; outputting the diagnosis result of the corresponding cylinder based on the calculation result of the air-fuel ratio data of each cylinder and the target set value, and executing the corresponding adjustment strategy; the present invention can diagnose the function and performance of the engine in advance, and reduce the failure rate of the engine.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a hydrogen engine exhaust gas measurement device, performance diagnosis method and system. Background Art

[0002] Patent CN108644046A discloses a gas engine knock detection and ignition control system, including an ignition controller, a power supply, a knock sensor, a camshaft position sensor, an ignition coil, an ignition rod and a spark plug. When the knock sensor senses that the vibration frequency of the cylinder reaches or exceeds the lowest knock frequency, the ignition controller delays the ignition advance angle according to the vibration frequency ignition advance angle MAP diagram, so that the frequency corresponding to the ignition advance angle is within the vibration frequency range. Since the upper limit of the vibration frequency range is less than the lowest knock frequency, the knock can be completely eliminated at one time.

[0003] The above-mentioned prior art discloses a means of eliminating knock, but the above-mentioned situation is only one of the failure situations encountered during the operation of the engine. Since the engine is the core assembly structure of the automobile, how to diagnose the relevant performance and functions of the engine during the development and production process so as to avoid engine failure in advance is the current key research direction.

[0004] Based on this, the present application provides a hydrogen engine exhaust measurement device and performance diagnosis method, which further diagnoses and optimizes the engine performance during the development and production process to avoid possible engine failures or reduce the engine failure rate. Summary of the Invention

[0005] The purpose of this application is to provide a hydrogen engine exhaust measurement device, performance diagnosis method and system, which can diagnose the engine's function and performance in advance during the development and production stages, thereby reducing the overall engine failure rate. The specific solution is as follows:

[0006] A hydrogen engine exhaust gas measurement device comprises: an exhaust module and an exhaust collection device; a plurality of first pipes are evenly arranged on one side of the exhaust module; one side of each first pipe is connected to an exhaust collection device; each exhaust collection device comprises: an exhaust collection pipe connected to one side of the first pipe, and electromagnetic control valves arranged at both ends of the exhaust collection pipe; the internal chamber of the exhaust collection pipe located between the two electromagnetic control valves is an exhaust collection chamber; and an air-fuel ratio detection device is arranged on the side wall of each exhaust collection chamber.

[0007] Furthermore, one end of each of the first pipes away from the exhaust module is connected to an exhaust manifold; and an exhaust port is provided on the exhaust manifold.

[0008] Furthermore, the exhaust module is connected to the engine cylinder head on one side away from the first pipe; a plurality of air guide channels are provided in the length direction of the exhaust module; one end of each air guide channel is connected to the corresponding first pipe, and the other end is connected to the cylinder in the engine cylinder head.

[0009] Furthermore, one end of each exhaust gas collecting pipe away from the first pipe is connected to a smoke exhaust pipe; exhaust gas in the exhaust gas collecting chamber is discharged through the smoke exhaust pipe.

[0010] Furthermore, it also includes: an ECU control unit electrically connected to each electromagnetic control valve; the ECU control unit is used to control the opening and closing of the electromagnetic control valves at both ends of each exhaust collection chamber according to the engine phase.

[0011] A hydrogen engine performance diagnosis method is applied to the hydrogen engine exhaust gas measurement device; the method comprises the following steps:

[0012] Step S1: respectively obtaining the air-fuel ratio data of each cylinder of the engine within a preset combustion time;

[0013] Step S2: Based on the calculation results of the air-fuel ratio data of each cylinder and the target setting value, the diagnosis result of the corresponding cylinder is output and the corresponding adjustment strategy is executed.

[0014] Furthermore, the step S2 specifically includes:

[0015] Step S201: If the differences between the acquired air-fuel ratio data of all cylinders and the target set value are all less than the lower limit of the first interval, then output a first diagnosis result;

[0016] Step S202: If the difference between the acquired air-fuel ratio data of all cylinders and the target setting value is within a first interval, then output a second diagnosis result and execute a second adjustment strategy;

[0017] Step S203: If the difference between the acquired air-fuel ratio data of all cylinders and the target setting value is greater than the upper limit of the first interval, then output a third diagnosis result and execute a third adjustment strategy;

[0018] Step S204: If all the acquired cylinder air-fuel ratio data include: first air-fuel ratio data between the first interval and second air-fuel ratio data greater than the upper limit of the first interval, then the fourth adjustment strategy is executed.

[0019] Furthermore, the step 202 specifically includes:

[0020] Acquire first air-fuel ratio data having a difference value between the first interval;

[0021] If, by adjusting the engine parameter data, the difference between the adjusted first air-fuel ratio data and the target setting value is less than the lower limit of the first interval, then the second diagnostic result is adjusted to the first diagnostic result;

[0022] If, by adjusting the engine parameter data, the difference between any adjusted first air-fuel ratio data and the target setting value is still within the first interval, then the second diagnosis result is determined to be correct.

[0023] Furthermore, the step 203 specifically includes:

[0024] Acquire second air-fuel ratio data whose difference is greater than the upper limit value of the first interval;

[0025] If, by adjusting the engine parameter data, the difference between the adjusted second air-fuel ratio data and the target setting value is within the first interval, then the third diagnostic result is adjusted to the second diagnostic result;

[0026] If, by adjusting the engine parameter data, the difference between the adjusted second air-fuel ratio data and the target setting value is less than the lower limit of the first interval, then the third diagnosis result is adjusted to the first diagnosis result;

[0027] If, by adjusting the engine parameter data, the difference between any adjusted second air-fuel ratio data and the target setting value is still greater than the upper limit of the first interval, then the third diagnosis result is determined to be correct.

[0028] A hydrogen engine performance diagnostic system, comprising:

[0029] an air-fuel ratio acquisition module, configured to respectively acquire air-fuel ratio data of each cylinder of the engine within a preset combustion time;

[0030] The strategy execution module is configured to output a corresponding diagnosis result and execute a corresponding adjustment strategy based on the calculation result of the air-fuel ratio data of each cylinder and the target setting value.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention provides a hydrogen engine exhaust gas measurement device, performance diagnosis method and system. First, the exhaust gas measurement device can accurately measure the air-fuel ratio data of each cylinder. Based on the air-fuel ratio data, a performance diagnosis method is used to output the performance diagnosis result of each cylinder. By executing the corresponding adjustment strategy and adjusting the engine parameter data, the overall performance of the engine is optimized and the service life of the engine is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 and Figure 2Schematic diagram of the structure of the hydrogen engine exhaust measurement device from different angles;

[0034] Figure 3 This is a schematic diagram of the structure of one side of the exhaust module;

[0035] Figure 4 This is a flow chart of a hydrogen engine performance diagnosis method;

[0036] Figure 5 This is the structural block diagram of the hydrogen engine performance diagnosis system.

[0037] In the picture:

[0038] 1. Exhaust module; 11. First pipeline; 12. Air guide channel;

[0039] 2. Exhaust gas collection device; 21. Exhaust gas collection pipe; 22. Solenoid control valve;

[0040] 3. Connection hole; 4. Exhaust manifold; 5. Exhaust port; 6. Engine cylinder head; 7. Exhaust pipe. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of this application clearer, the following Figure 1-5 This application is further described in detail. Obviously, the embodiments described are only a part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] The terms used in the examples of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a," "the," and "the" used in the examples of this application and the appended claims are also intended to include plural forms, and unless the context clearly indicates otherwise, "a plurality" generally includes at least two.

[0043] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0044] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0045] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0046] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or device. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or device comprising the element.

[0047] It should be noted in particular that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0048] First, to facilitate understanding of the hydrogen engine uniform exhaust measurement device, performance diagnostic method, and system provided in this application, the following detailed explanation is provided: Currently, existing technologies primarily eliminate engine knock failures through knock detection during later engine use. However, during early engine development and production, there is a lack of effective means to verify engine performance and functional improvements. This situation can lead to subsequent engines failing to operate efficiently or even experiencing operational failures. Based on this, the present invention provides a hydrogen engine uniform exhaust measurement device, performance diagnostic method, and system. These preventative measures are implemented during early development and production to ensure stable engine performance and reduce engine failure rates.

[0049] Combine Figure 1 As shown, the present application provides a hydrogen engine exhaust measurement device, comprising: an exhaust module 1 and an exhaust collection device 2; a plurality of first pipes 11 are evenly arranged on one side of the exhaust module 1; one side of each first pipe 11 is connected to an exhaust collection device 2; each exhaust collection device 2 comprises: an exhaust collection pipe 21 connected to one side of the first pipe 11, and electromagnetic control valves 22 arranged at both ends of the exhaust collection pipe 21; wherein the internal chamber of the exhaust collection pipe 21 located between the two electromagnetic control valves 22 is an exhaust collection chamber; an air-fuel ratio detection device is arranged on the side wall of each exhaust collection chamber. Specifically, a connection hole 3 for mounting the air-fuel ratio detection device is provided on the side wall of each exhaust collection chamber.

[0050] In this embodiment, the air-fuel ratio detection device is a mass spectrometer.

[0051] Specifically, the present application utilizes the exhaust collection device 2 to analyze and measure the exhaust of each cylinder individually, and the cylinders will not affect each other during the measurement process, thereby improving the accuracy of the measured cylinder data as a whole, thereby providing favorable technical support for the subsequent performance analysis of each cylinder.

[0052] Furthermore, the present application utilizes an exhaust collection chamber to collect the exhaust volume generated by the cylinder during one stroke, and uses an air-fuel ratio detection device to measure the air-fuel ratio data of each cylinder. Through data analysis, the performance status of the cylinder can be accurately obtained.

[0053] Furthermore, in order to accurately collect the exhaust gas generated by each cylinder, the present application synchronously controls the opening or closing of the electromagnetic control valve 22 at both ends of each exhaust collection chamber in response to the engine phase, thereby ensuring the detection environment of the air-fuel ratio detection equipment, making the air-fuel ratio data detection accuracy higher, and therefore, being able to more accurately obtain the operating performance status of the cylinder.

[0054] It should be noted that the air-fuel ratio is an important parameter for measuring engine combustion efficiency, and it is related to the operating state of each cylinder. For inappropriate air-fuel ratio data, it will cause single-cylinder detonation or misfire in the subsequent combustion process, thereby causing the engine to be unable to operate efficiently. In severe cases, it may even cause malfunctions, such as failure or damage of the gas injector.

[0055] Optionally, one end of each first pipe 11 away from the exhaust module 1 is connected to the exhaust manifold 4; an exhaust port 5 is provided in the middle of the outer side of the exhaust manifold 4. It can be understood that in this application, the exhaust from each cylinder is discharged to the turbocharger through the exhaust manifold 4.

[0056] Optionally, the exhaust module 1 is connected to the engine cylinder head 6 on the side facing away from the first pipe 11; a plurality of air guide channels 12 are provided in the length direction of the exhaust module 1; one end of each air guide channel 12 is connected to the corresponding first pipe 11, and the other end is connected to the cylinder in the engine cylinder head 6.

[0057] It can be understood that the present application connects each cylinder with the corresponding first pipe 11 through several air guide channels 12, so that the exhaust of each cylinder is separated in advance before the exhaust flows through the exhaust manifold 4, avoiding the mutual influence of each cylinder, and can accurately collect the exhaust gas of each cylinder, so that the detection data of the air-fuel ratio detection equipment can more accurately reflect the operating status of each cylinder.

[0058] Optionally, one end of each exhaust gas collecting pipe 21 away from the first pipe 11 is connected to the smoke exhaust pipe 7; the exhaust gas in the exhaust gas collecting chamber is discharged through the smoke exhaust pipe 7.

[0059] Furthermore, the present application also includes: an ECU control unit electrically connected to each solenoid control valve 22; the ECU control unit is used to control the simultaneous opening or closing of the solenoid control valves at both ends of each exhaust collection chamber according to the engine phase (such as the valve phase or the engine stroke stage), so as to accurately collect the exhaust gas generated by each cylinder during a stroke.

[0060] Furthermore, the ECU control unit is also used to determine engine timing information based on information collected by the camshaft and crankshaft sensors.

[0061] On the other hand, the present application provides a hydrogen engine performance diagnosis method, which is applied to the hydrogen engine exhaust gas measurement device; the method comprises the following steps:

[0062] Step S1: respectively obtaining the air-fuel ratio data of each cylinder of the engine within a preset combustion time;

[0063] Step S2: Outputting corresponding diagnosis results and executing corresponding adjustment strategies based on the calculation results of the air-fuel ratio data of each cylinder and the target setting value.

[0064] Specifically, the present application collects the air-fuel ratio data of each cylinder within the preset engine combustion time (e.g., 10 minutes); outputs the diagnostic results of the corresponding cylinder by calculating the air-fuel ratio data of each cylinder and the target setting value, and executes the corresponding adjustment strategy, thereby optimizing the cylinder performance of the engine to ensure that each cylinder can reach the optimal operating state.

[0065] In a specific embodiment, the step S2 specifically includes:

[0066] Step S201: If the difference between the acquired air-fuel ratio data of all cylinders and the target setting value is less than the lower limit of the first interval, then output a first diagnosis result;

[0067] Step S202: If the difference between the acquired air-fuel ratio data of all cylinders and the target setting value is within a first interval, then output a second diagnosis result and execute a second adjustment strategy;

[0068] Step S203: If the difference between the obtained air-fuel ratio data of all cylinders and the target setting value is greater than the upper limit of the first interval, then output a third preliminary diagnosis result and execute a third adjustment strategy;

[0069] Step S204: If all the acquired cylinder air-fuel ratio data include: first air-fuel ratio data between the first interval and second air-fuel ratio data greater than the upper limit value of the first interval, then the fourth adjustment strategy is executed; wherein the fourth adjustment strategy includes a second adjustment strategy corresponding to the first air-fuel ratio data and a third adjustment strategy corresponding to the second air-fuel ratio data.

[0070] For example, taking a six-cylinder engine as an example, the air-fuel ratio value corresponding to the target setting value is 2.4; the first interval is 0.3-0.75. If the air-fuel ratio data of the cylinders obtained are all less than 2.7, then the difference between the air-fuel ratio data of the cylinder and the target setting value is less than 0.3, indicating that the operating performance of the cylinder is excellent (i.e., the first diagnostic result). If the air-fuel ratio data of the cylinders obtained are 2.7, 2.8, and 3.15, then the operating performance of the cylinder is good (i.e., the second diagnostic result); if the air-fuel ratio data of the cylinders obtained are 3.2, 3.21, and 3.22, then the operating performance of the cylinder is poor (i.e., the third diagnostic result); if the air-fuel ratio data of the cylinders obtained include 2.8, 3.0, 3.16, and 3.2, then the operating performance of the cylinder is medium; wherein, the ranking of the operating performance is excellent > good > medium > poor.

[0071] Specifically, when the operating performance of the cylinder is poor, it indicates that the gas injector of the cylinder is in a failed state or damaged state, and the gas injector needs to be repaired or replaced.

[0072] In a specific embodiment, step 202 specifically includes:

[0073] Acquire first air-fuel ratio data having a difference value between the first interval;

[0074] If, by adjusting the engine parameter data, the difference between the adjusted first air-fuel ratio data and the target setting value is less than the lower limit of the first interval, then the second diagnostic result is adjusted to the first diagnostic result; wherein the engine parameter data at least includes the injection duration of the gas injector.

[0075] If, by adjusting the engine parameter data, the difference between any adjusted first air-fuel ratio data and the target setting value is still within the first interval, then the second diagnosis result is determined to be correct.

[0076] Specifically, when the first air-fuel ratio data is obtained, by adjusting the engine parameter data so that the difference between the adjusted first air-fuel ratio data and the target setting value is less than the lower limit value of the first interval, the diagnosis result is adjusted; if the difference between any one of the adjusted first air-fuel ratio data and the target setting value is still between the first interval, the diagnosis result is determined to be correct.

[0077] It can be understood that the present application adjusts the air-fuel ratio data of each cylinder by adjusting the engine parameter data; for example, by adjusting the injection duration of the gas injector of the cylinder, the air-fuel ratio measurement value of the corresponding cylinder is adjusted; if the injection duration of the gas injector is adjusted to the injection duration threshold, the adjustment of the engine parameter data is stopped, and the air-fuel ratio data when adjusted to the duration threshold is used as the final performance judgment data of the cylinder.

[0078] In a specific embodiment, step 203 specifically includes:

[0079] Acquire second air-fuel ratio data whose difference is greater than the upper limit value of the first interval;

[0080] If, by adjusting the engine parameter data, the difference between the adjusted second air-fuel ratio data and the target setting value is within the first interval, then the third diagnostic result is adjusted to the second diagnostic result;

[0081] If, by adjusting the engine parameter data, the difference between the adjusted second air-fuel ratio data and the target setting value is less than the lower limit of the first interval, then the third diagnosis result is adjusted to the first diagnosis result;

[0082] If, by adjusting the engine parameter data, the difference between any adjusted second air-fuel ratio data and the target setting value is still greater than the upper limit of the first interval, then the third diagnosis result is determined to be correct.

[0083] It can be understood that the present application diagnoses the performance of each cylinder by adopting a hydrogen engine performance diagnosis method, and optimizes the engine parameter data by adjusting the engine parameter data, so that the operating performance of the cylinder reaches the optimal state, thereby avoiding possible engine failures in advance or reducing the engine failure rate.

[0084] In another aspect, the present application provides a hydrogen engine performance diagnostic system, comprising:

[0085] an air-fuel ratio acquisition module, configured to respectively acquire air-fuel ratio data of each cylinder of the engine within a preset combustion time;

[0086] The strategy execution module is configured to output a corresponding diagnosis result and execute a corresponding adjustment strategy based on the calculation result of the air-fuel ratio data of each cylinder and the target setting value.

[0087] It is worth noting that although this system only discloses the air-fuel ratio acquisition module and the strategy execution module, it does not mean that this device is limited to the above-mentioned basic functional modules; what the present invention wants to express is that, based on the above-mentioned basic functional modules, those skilled in the art can arbitrarily add one or more functional modules in combination with the existing technology to form an infinite number of embodiments or technical solutions. In other words, this system is open rather than closed. Just because this embodiment only discloses individual basic functional modules, it cannot be considered that the scope of protection of the claims of the present invention is limited to the above-mentioned basic functional modules.

[0088] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0089] On the other hand, the present application provides a computer-readable storage medium storing a computer program executable by an electronic device, wherein when the computer program runs on the electronic device, the electronic device executes the steps of the method.

[0090] On the other hand, the present application provides a vehicle, which is provided with the hydrogen engine performance diagnostic system.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogen engine exhaust gas measuring device, characterized in that: include: An exhaust module (1) and an exhaust collection device (2); a plurality of first pipes (11) are evenly arranged on one side of the exhaust module (1); one side of each first pipe (11) is connected to an exhaust collection device (2); each exhaust collection device (2) comprises: an exhaust collection pipe (21) communicating with one side of the first pipe (11), and electromagnetic control valves (22) arranged at both ends of the exhaust collection pipe (21); wherein the internal chamber of the exhaust collection pipe (21) located between the two electromagnetic control valves (22) is an exhaust collection chamber; an air-fuel ratio detection device is arranged on the side wall of each exhaust collection chamber; One end of each first pipe (11) away from the exhaust module (1) is connected to an exhaust manifold (4); an exhaust port (5) is provided on the exhaust manifold (4); The exhaust module (1) is connected to the engine cylinder head (6) on a side facing away from the first pipe (11); a plurality of air guide channels (12) are provided in the length direction of the exhaust module (1); one end of each air guide channel (12) is connected to the corresponding first pipe (11), and the other end is connected to the cylinder in the engine cylinder head (6); One end of each exhaust gas collecting pipe (21) away from the first pipe (11) is connected to a smoke exhaust pipe (7); exhaust gas in the exhaust gas collecting chamber is discharged through the smoke exhaust pipe (7).

2. The hydrogen engine exhaust gas measuring device according to claim 1, characterized in that: It also includes an ECU control unit electrically connected to each electromagnetic control valve (22); the ECU control unit is used to control the opening and closing of the electromagnetic control valve (22) at both ends of each exhaust collection chamber according to the engine phase.

3. A hydrogen engine performance diagnosis method, characterized in that: The method for measuring exhaust gas from a hydrogen engine according to any one of claims 1 to 2 comprises the following steps: Step S1: respectively obtaining the air-fuel ratio data of each cylinder of the engine within a preset combustion time; Step S2: Based on the calculation results of the air-fuel ratio data of each cylinder and the target setting value, the diagnosis result of the corresponding cylinder is output and the corresponding adjustment strategy is executed.

4. The hydrogen engine performance diagnosis method according to claim 3, characterized in that: The step S2 specifically includes: Step S201: If the differences between the acquired air-fuel ratio data of all cylinders and the target set value are all less than the lower limit of the first interval, then output a first diagnosis result; Step S202: If the difference between the acquired air-fuel ratio data of all cylinders and the target setting value is within a first interval, then output a second diagnosis result and execute a second adjustment strategy; Step S203: If the difference between the acquired air-fuel ratio data of all cylinders and the target setting value is greater than the upper limit of the first interval, then output a third diagnosis result and execute a third adjustment strategy; Step S204: If all the acquired cylinder air-fuel ratio data include: first air-fuel ratio data between the first interval and second air-fuel ratio data greater than the upper limit of the first interval, then the fourth adjustment strategy is executed.

5. The hydrogen engine performance diagnosis method according to claim 4, characterized in that: The step 202 specifically includes: Acquire first air-fuel ratio data having a difference value between the first interval; If, by adjusting the engine parameter data, the difference between the adjusted first air-fuel ratio data and the target setting value is less than the lower limit of the first interval, then the second diagnostic result is adjusted to the first diagnostic result; If, by adjusting the engine parameter data, the difference between any adjusted first air-fuel ratio data and the target setting value is still within the first interval, then the second diagnosis result is determined to be correct.

6. The hydrogen engine performance diagnosis method according to claim 5, characterized in that: The step 203 specifically includes: Acquire second air-fuel ratio data whose difference is greater than the upper limit value of the first interval; If, by adjusting the engine parameter data, the difference between the adjusted second air-fuel ratio data and the target setting value is within the first interval, then the third diagnostic result is adjusted to the second diagnostic result; If, by adjusting the engine parameter data, the difference between the adjusted second air-fuel ratio data and the target setting value is less than the lower limit of the first interval, then the third diagnosis result is adjusted to the first diagnosis result; If, by adjusting the engine parameter data, the difference between any adjusted second air-fuel ratio data and the target setting value is still greater than the upper limit of the first interval, then the third diagnosis result is determined to be correct.

7. A hydrogen engine performance diagnostic system, characterized in that: For implementing the hydrogen engine performance diagnosis method according to any one of claims 3 to 6, the diagnostic system comprises: an air-fuel ratio acquisition module, configured to respectively acquire air-fuel ratio data of each cylinder of the engine within a preset combustion time; The strategy execution module is configured to output a corresponding diagnosis result and execute a corresponding adjustment strategy based on the calculation result of the air-fuel ratio data of each cylinder and the target setting value.

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