Hydrogen engine tail gas measuring device and performance diagnosis method and system

Abstract

The invention relates to the technical field of engines, and provides a hydrogen engine tail gas measuring device and a performance diagnosis method and system. The device comprises an exhaust module and an exhaust collecting device, a plurality of first pipelines are uniformly arranged on one side of the exhaust module; one side of each first pipeline is connected with an exhaust gas collecting device; each exhaust gas collecting device comprises an exhaust gas collecting pipeline communicated with one side of the first pipeline and electromagnetic control valves arranged at the two ends of the exhaust gas collecting pipeline; the method comprises the steps that air-fuel ratio data of each air cylinder of an engine within preset combustion time are obtained; according to the calculation result of the air-fuel ratio data of each air cylinder and the target set value, a diagnosis result of the corresponding air cylinder is output, and a corresponding adjustment strategy is executed; according to the invention, the function and performance of the engine can be diagnosed in advance, and the failure rate of the engine is reduced.

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, a performance diagnosis method and a 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 fault conditions 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 function and performance of the engine in advance during the development and production stages, thereby reducing the overall failure rate of the engine. The specific scheme is as follows:

[0006] A hydrogen engine exhaust gas measuring 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; wherein the internal chamber of the exhaust collecting pipe between the two electromagnetic control valves is an exhaust collecting chamber; an air-fuel ratio detection device is arranged on the side wall of each exhaust collecting 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 arranged 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 of the exhaust gas collecting pipes 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 result 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 all the acquired air-fuel ratio data of the cylinder and the target setting value are all less than the lower limit of the first interval, then output the 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 the 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 the acquired air-fuel ratio data of the cylinders 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.

[0019] Furthermore, the step 202 specifically includes:

[0020] Acquire first air-fuel ratio data whose difference is between a 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 diagnosis result is adjusted to the first diagnosis 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 diagnosis result is adjusted to the second diagnosis 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 according to a calculation result of the air-fuel ratio data of each cylinder and a 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, a performance diagnosis method and a 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 a 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 2It is a schematic diagram of the structure of the hydrogen engine exhaust measurement device at different angles;

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

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

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

[0037] In the figure:

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

[0039] 2. Exhaust gas collection device; 21. Exhaust gas collection pipeline; 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 will be combined with the attached Figure 1-5 The present application is further described in detail. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

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

[0043] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after 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 determining" 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 term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

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

[0048] First, in order to facilitate understanding of the uniform exhaust gas measurement device, performance diagnosis method and system of a hydrogen engine provided by the present application, the following detailed explanation is now made: The means of the current prior art are mainly to eliminate the knock failure of the engine through knock detection during the later use of the engine, but in the early development and production process of the engine, there is no effective means to test the performance and function improvement of the engine, and this situation may cause the subsequent engine to fail to operate efficiently, or even cause use failure. Based on this, the present invention provides a uniform exhaust gas measurement device, performance diagnosis method and system for a hydrogen engine, and in the early development and production process, avoidance measures are taken in advance to ensure the stable performance of the engine and reduce the failure rate of the engine.

[0049] Combination Figure 1 As shown, the present application provides a hydrogen engine exhaust gas measurement device, including: 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 includes: 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 installing an air-fuel ratio detection device is arranged 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 gas 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 measuring cylinder data as a whole, thereby providing favorable technical support for 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, so as to accurately obtain the performance status of the cylinder through data analysis.

[0053] Furthermore, in order to accurately collect the exhaust gas generated by each cylinder, the present application responds to the engine phase and synchronously controls the opening or closing of the electromagnetic control valve 22 at both ends of each exhaust collection chamber, thereby ensuring the detection environment of the air-fuel ratio detection equipment, making the air-fuel ratio data detection more accurate, 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. Inappropriate air-fuel ratio data will cause single-cylinder knock or misfire in the subsequent combustion process, causing the engine to be unable to operate efficiently, and even in severe cases, it will cause usage failures, 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 the present application discharges the exhaust from each cylinder to the turbocharger through the exhaust manifold 4.

[0056] Optionally, the side of the exhaust module 1 facing away from the first pipe 11 is connected to the engine cylinder head 6; a plurality of air guide channels 12 are arranged 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 a plurality of air guide channels 12, so that the exhaust of each cylinder is separated separately in advance before the exhaust flows through the exhaust manifold 4, thereby avoiding the mutual influence of each cylinder and being able to 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 the engine timing information based on the 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: According to the calculation result of the air-fuel ratio data of each cylinder and the target setting value, the corresponding diagnosis result is output and the corresponding adjustment strategy is executed.

[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 result 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 and ensuring 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 the first interval, then output a second diagnosis result and execute a second adjustment strategy;

[0068] 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 preliminary diagnosis result and execute a third adjustment strategy;

[0069] Step S204: If all the acquired air-fuel ratio data of the cylinder 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 execute the fourth adjustment strategy; 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, it indicates that 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, it indicates that 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, it indicates that 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 a 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 whose difference is between a 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 diagnostic 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, then the diagnostic 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 diagnosis result is adjusted to the second diagnosis 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] On the other hand, 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 according to a calculation result of the air-fuel ratio data of each cylinder and a target setting value.

[0087] It is worth noting that although the present system only discloses the air-fuel ratio acquisition module and the strategy execution module, it does not mean that the present 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 prior art to form an infinite number of embodiments or technical solutions, that is to say, the present system is open rather than closed, and because the present 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 disclosed 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 may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present 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 the layers and regions may be enlarged, 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, wherein the vehicle 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by 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 measurement 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) 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.

2. The hydrogen engine exhaust gas measuring device according to claim 1, characterized in that: One end of each of the first pipes (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).

3. The hydrogen engine exhaust gas measuring device according to claim 2, characterized in that: The exhaust module (1) is connected to the engine cylinder head (6) at 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).

4. The hydrogen engine exhaust gas measuring device according to claim 3, characterized in that: 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).

5. The hydrogen engine exhaust gas measuring device according to claim 4, 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 gas collection chamber according to the engine phase.

6. A hydrogen engine performance diagnosis method, characterized in that: The method is applied to the hydrogen engine exhaust gas measuring device according to any one of claims 1 to 5; the method 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 result 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.

7. The hydrogen engine performance diagnosis method according to claim 6, characterized in that: The step S2 specifically includes: Step S201: if the differences between all the acquired air-fuel ratio data of the cylinder and the target setting value are all less than the lower limit of the first interval, then output the 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 the 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 the acquired air-fuel ratio data of the cylinders 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.

8. The hydrogen engine performance diagnosis method according to claim 7, characterized in that: The step 202 specifically includes: Acquire first air-fuel ratio data whose difference is between a 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 diagnosis result is adjusted to the first diagnosis 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.

9. The hydrogen engine performance diagnosis method according to claim 8, 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 diagnosis result is adjusted to the second diagnosis 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.

10. A hydrogen engine performance diagnostic system, characterized in that: include: 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 according to a calculation result of the air-fuel ratio data of each cylinder and a target setting value.

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