Natural gas engine air supply fault determination method, device and electronic equipment

Abstract

This application provides a method, apparatus, and electronic device for determining gas supply faults in a natural gas engine. The method includes: acquiring a reference gas pressure set and a comparison gas pressure set, wherein the reference gas pressure set includes one of a first reference gas pressure and a second reference gas pressure, and the comparison gas pressure set includes one of a first comparison gas pressure and a second comparison gas pressure; determining whether there is a fault in the natural gas engine's gas supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure. This solution achieves accurate and timely prediction and determination of gas supply faults in natural gas engines.

Description

Technical Field

[0001] This application relates to the field of natural gas engines, and more specifically, to a method, apparatus, and electronic equipment for determining gas supply faults in natural gas engines. Background Technology

[0002] The natural gas engine gas supply system mainly consists of a gas tank, carburetor, buffer tank, shut-off valve, pressure regulator (pressure reducer), filter, gas supply pipeline, gas rail, injection valve, etc. Failure of any of these components will cause abnormal operation of the gas supply system, further leading to excessively low or high gas pressure. Problems such as minor leaks or blockages in the gas supply pipeline, filter blockage, or jamming of related mechanical parts in the gas supply system can cause uneven gas supply. When the fault is minor, the impact on the engine under steady-state conditions is not significant. However, under transient loading conditions, such as when the vehicle is climbing a hill, shifting gears, or accelerating rapidly, uneven gas supply can cause the gas pressure to be low or rise slowly. The fuel injection may not reach the required value in a short time, resulting in insufficient power of the vehicle. If the gas pressure is not low enough to reach the diagnostic threshold, conventional low gas pressure fault detection methods cannot quickly locate the cause of insufficient power. Even if a low pressure fault is reported after the pressure falls below the threshold, the fault location of the gas supply system cannot be accurately located.

[0003] The relevant solutions can only confirm faults when the natural gas pressure is higher or lower than the normal operating range, resulting in a large delay and poor accuracy in diagnosing engine gas supply system faults. Summary of the Invention

[0004] The main objective of this application is to provide a method, apparatus, and electronic device for determining gas supply faults in natural gas engines, so as to at least solve the problem of poor accuracy in fault diagnosis of engine gas supply systems in related technologies.

[0005] To achieve the above objectives, according to one aspect of this application, a method for determining a gas supply fault in a natural gas engine is provided, comprising: acquiring a reference gas pressure set and a comparison gas pressure set, wherein the reference gas pressure set includes one of a first reference gas pressure and a second reference gas pressure, the first reference gas pressure being the gas pressure when the natural gas engine's operating condition changes from a steady-state condition to a transient loading condition, and the second reference gas pressure being the gas pressure when the engine's operating condition changes from a steady-state condition to a transient unloading condition; the comparison gas pressure set includes one of a first comparison gas pressure and a second comparison gas pressure, the first comparison gas pressure being the gas pressure within a first preset time period after the natural gas engine's gas supply system enters the transient loading condition, and the second comparison gas pressure being the gas pressure within a second preset time period after the gas supply system enters the transient unloading condition; and determining whether the natural gas engine's gas supply system has a fault based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure.

[0006] Optionally, obtaining the comparison gas pressure group includes: obtaining a target first comparison gas pressure within a first preset time period after the natural gas engine supply system enters the transient loading condition, wherein the target first comparison gas pressure is the minimum value among multiple first comparison gas pressures obtained within the first preset time period; and obtaining a target second comparison gas pressure within a second preset time period after the natural gas engine supply system enters the transient unloading condition, wherein the target second comparison gas pressure is the maximum value among multiple second comparison gas pressures obtained within the second preset time period.

[0007] Optionally, determining whether the natural gas engine supply system is faulty based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure, includes: determining whether the natural gas engine supply system is faulty based on the difference between the first reference gas pressure and the target first comparison gas pressure, or based on the difference between the second reference gas pressure and the target second comparison gas pressure.

[0008] Optionally, determining whether the natural gas engine supply system is faulty based on the difference between the first reference gas pressure and the target first comparative gas pressure includes: if the first difference is greater than a first preset difference, determining that the fault in the natural gas engine supply system is an abnormal fault in the gas supply pipeline, wherein the first difference is the difference between the first reference gas pressure and the target first comparative gas pressure; if the first difference is less than or equal to the first preset difference, temporarily determining that the natural gas engine supply system is fault-free, and proceeding to the first determining step: determining whether the natural gas engine operating condition is the transient loading condition.

[0009] Optionally, determining whether the natural gas engine supply system is faulty based on the difference between the second reference gas pressure and the target second comparison gas pressure includes: if the second difference is less than a second preset difference, determining that the fault in the natural gas engine supply system is an abnormal fault in the gas supply pipeline, wherein the second difference is the difference between the target second comparison gas pressure and the second reference gas pressure; if the second difference is greater than or equal to the second preset difference, temporarily determining that the natural gas engine supply system is fault-free, and proceeding to the second determination step: determining whether the natural gas engine operating condition is the transient unloading condition.

[0010] Optionally, the method further includes: constructing a first MAP and a second MAP, wherein the first MAP represents the correspondence between the natural gas engine speed, intake pressure and the first preset time period, and the second MAP represents the correspondence between the natural gas engine speed, intake pressure and the first preset difference; determining the first preset time period under the current operating condition based on the first MAP, the natural gas engine speed and the intake pressure under the current operating condition; and determining the first preset difference under the current operating condition based on the second MAP, the natural gas engine speed and the intake pressure under the current operating condition.

[0011] Optionally, the method further includes: constructing a third MAP and a fourth MAP, wherein the third MAP represents the correspondence between the natural gas engine speed, intake pressure and the second preset time period, and the fourth MAP represents the correspondence between the natural gas engine speed, intake pressure and the second preset difference; determining the second preset time period under the current operating condition based on the third MAP, the natural gas engine speed and the intake pressure under the current operating condition; and determining the second preset difference under the current operating condition based on the fourth MAP, the natural gas engine speed and the intake pressure under the current operating condition.

[0012] Optionally, before obtaining the reference gas pressure set and the comparison gas pressure set, the method further includes: determining whether the vehicle gas supply system meets a first set of conditions and a second set of conditions, wherein the first set of conditions includes: the remaining fuel amount in the vehicle gas cylinder is greater than or equal to a fuel amount threshold, the gas cylinder pressure is greater than or equal to a gas cylinder pressure threshold, and there are currently no known gas supply system-related faults; the second set of conditions includes: the natural gas engine speed is greater than a speed threshold, the intake pressure is greater than an intake pressure threshold, and the gas pressure is greater than a gas pressure threshold; determining whether the natural gas engine operating condition is a transient operating condition, wherein the transient operating condition is the transient loading condition or the transient unloading condition; if the vehicle gas supply system meets the first set of conditions, the natural gas engine-related parameters meet the second set of conditions, and the natural gas engine operating condition is the transient condition, determining to execute the acquisition step: acquiring the first reference gas pressure when the natural gas engine operating condition changes from a steady-state condition to a transient loading condition, and the second reference gas pressure when it changes from a steady-state condition to a transient unloading condition.

[0013] According to another aspect of this application, a natural gas engine gas supply fault determination device is provided, comprising: an acquisition unit, configured to acquire a reference gas pressure set and a comparison gas pressure set, wherein the reference gas pressure set includes one of a first reference gas pressure and a second reference gas pressure, the first reference gas pressure being the gas pressure when the natural gas engine's operating condition changes from a steady-state condition to a transient loading condition, and the second reference gas pressure being the gas pressure when the operating condition changes from a steady-state condition to a transient unloading condition; the comparison gas pressure set includes one of a first comparison gas pressure and a second comparison gas pressure, the first comparison gas pressure being the gas pressure of the natural gas engine's gas supply system during a first preset time period after entering the transient loading condition, and the second comparison gas pressure being the gas pressure of the gas supply system during a second preset time period after entering the transient unloading condition; and a first determination unit, configured to determine whether there is a fault in the natural gas engine's gas supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure.

[0014] According to another aspect of this application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including methods for performing any of the described natural gas engine gas supply fault determination methods.

[0015] By applying the technical solution of this application, a fault in the natural gas engine supply system is determined by acquiring a reference gas pressure set and a comparison gas pressure set, and by calculating the difference between the first reference gas pressure and the first comparison gas pressure, or by calculating the difference between the second reference gas pressure and the second comparison gas pressure. The relationship between steady-state and transient operating conditions and gas pressure is considered, as well as the magnitude of the difference. Furthermore, transient loading and transient unloading conditions are assessed separately, improving the accuracy and timeliness of natural gas engine supply fault diagnosis and prediction. This allows for the early diagnosis of anomalies such as weakened gas supply capacity and provides indication of the impact of this risk on subsequent high-load operation. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 A hardware structure block diagram of a mobile terminal for performing a natural gas engine gas supply fault determination method is shown in an embodiment of this application.

[0018] Figure 2 A flowchart illustrating a first method for determining a gas supply fault in a natural gas engine according to an embodiment of this application is shown.

[0019] Figure 3 A flowchart illustrating a second method for determining a gas supply failure in a natural gas engine, according to an embodiment of this application, is shown.

[0020] Figure 4 A flowchart illustrating a third method for determining a gas supply fault in a natural gas engine according to an embodiment of this application is shown.

[0021] Figure 5 A flowchart illustrating a specific method for determining a gas supply fault in a natural gas engine according to an embodiment of this application is shown.

[0022] Figure 6 A structural block diagram of a natural gas engine gas supply fault determination device provided according to an embodiment of this application is shown. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] For ease of description, the following explains some of the nouns or terms used in the embodiments of this application:

[0027] Steady-state operating condition: The operating condition in which the fluctuation of relevant parameters of the engine air supply system is less than the preset fluctuation. Ideally, the fluctuation of relevant parameters is zero.

[0028] Transient loading condition: The condition in which the fuel injection quantity of the engine air supply system increases in a short period of time;

[0029] Transient unloading condition: The condition in which the fuel injection quantity of the engine air supply system is reduced for a short period of time;

[0030] MAP: A two-dimensional array that takes X and Y as input and outputs the corresponding Z.

[0031] As described in the background section, the accuracy of fault diagnosis in the prior art for engine gas supply systems is poor. To address the problem of poor accuracy in fault diagnosis for engine gas supply systems, embodiments of this application provide a method, apparatus, and electronic device for determining gas supply faults in natural gas engines.

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0033] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1This is a hardware structure block diagram of a mobile terminal for a natural gas engine gas supply fault determination method according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0034] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the natural gas engine gas supply fault determination method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0035] This embodiment provides a method for determining a gas supply fault in a natural gas engine that runs on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0036] Figure 2 This is a flowchart of a method for determining a gas supply fault in a natural gas engine according to an embodiment of this application. Figure 2 As shown, the method includes the following steps:

[0037] Step S201: Obtain the reference gas pressure set and the comparison gas pressure set;

[0038] The reference gas pressure group includes one of a first reference gas pressure and a second reference gas pressure. The first reference gas pressure is the gas pressure when the natural gas engine changes from a steady-state operating condition to a transient loading condition, and the second reference gas pressure is the gas pressure when the engine changes from a steady-state operating condition to a transient unloading condition.

[0039] The gas pressure comparison group includes one of the first gas pressure comparison and the second gas pressure comparison. The first gas pressure comparison is the gas pressure during the first preset time period after the gas supply system of the natural gas engine enters the transient loading condition, and the second gas pressure comparison is the gas pressure during the second preset time period after the gas supply system enters the transient unloading condition.

[0040] Specifically, a first preset time period and a second preset time period are determined based on the natural gas engine speed and intake pressure. In particular, a mapping relationship between the natural gas engine speed, intake pressure and the first preset time period is pre-established; a mapping relationship between the natural gas engine speed, intake pressure and the second preset time period is also pre-established.

[0041] Specifically, step S201 includes:

[0042] The target first comparison gas pressure is obtained within a first preset time period after the natural gas engine gas supply system enters the transient loading condition. The target first comparison gas pressure is the minimum value among multiple first comparison gas pressures obtained within the first preset time period.

[0043] The target second comparison gas pressure is obtained within a second preset time period after the natural gas engine gas supply system enters the transient unloading condition. The target second comparison gas pressure is the maximum value among the multiple second comparison gas pressures obtained within the second preset time period.

[0044] In other words, the minimum value is taken for transient loading conditions, and the maximum value is taken for transient unloading conditions; this setting makes the judgment more accurate and timely.

[0045] It should be noted that the minimum value among the multiple first comparative gas pressures and the maximum value among the multiple second comparative gas pressures are preferred choices. In some cases, choosing the second smallest value among the first comparative gas pressures and the second largest value among the multiple second comparative gas pressures is also feasible. In some cases, choosing the smaller value among the multiple first comparative gas pressures and the larger value among the multiple second comparative gas pressures is also feasible.

[0046] Step S202: Determine whether there is a fault in the natural gas engine gas supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure.

[0047] If it is determined that the natural gas engine is in a transient loading condition, the gas supply system of the natural gas engine is determined to be faulty based on the difference between the first reference gas pressure and the first comparison gas pressure.

[0048] If it is determined that the natural gas engine is in a transient unloading condition, the gas supply system of the natural gas engine is determined to be faulty based on the difference between the first reference gas pressure and the first comparison gas pressure.

[0049] The natural gas engine gas supply fault determination method of this application obtains a reference gas pressure set and a comparison gas pressure set, and determines whether there is a fault in the natural gas engine gas supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure. It considers the relationship between steady-state operating conditions, transient operating conditions, and gas pressure, takes into account the magnitude of the difference, and makes separate judgments for transient loading and transient unloading conditions, thus improving the accuracy and timeliness of natural gas engine gas supply fault diagnosis and prediction. It can achieve early diagnosis of the early abnormal phenomenon of weakened gas supply capacity of the gas supply system and indicate the impact of this risk on subsequent high-load operation.

[0050] In the method embodiments of this application, step S202, determining whether there is a fault in the natural gas engine supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure, includes:

[0051] The presence or absence of a fault in the natural gas engine supply system is determined based on the difference between the first reference gas pressure and the first target comparative gas pressure, or based on the difference between the second reference gas pressure and the second target comparative gas pressure.

[0052] As set up above, the target first comparison gas pressure is the minimum value among multiple first comparison gas pressures obtained within a first preset time period, and the target second comparison gas pressure is the maximum value among multiple second comparison gas pressures. Therefore, based on the difference between the first reference gas pressure and the target first comparison gas pressure, or based on the difference between the second reference gas pressure and the target second comparison gas pressure, accurate and timely prediction and diagnosis of natural gas engine supply faults can be achieved.

[0053] In the method embodiments of this application, such as Figure 3 As shown, step S202, determining whether there is a fault in the natural gas engine supply system based on the difference between the first reference gas pressure and the target first comparison gas pressure, includes:

[0054] Step S2021: If the first difference is greater than the first preset difference, determine that the fault of the natural gas engine gas supply system is an abnormal fault of the gas supply pipeline, wherein the first difference is the difference between the first reference gas pressure and the target first comparison gas pressure.

[0055] Specifically, a first preset difference is determined based on the natural gas engine speed and intake pressure, that is, a mapping relationship between the natural gas engine speed, intake pressure and the first preset difference is pre-established.

[0056] As shown above, the first difference is greater than the first preset difference, indicating that the gas pressure when the natural gas engine changes from steady state to transient loading state is greater than the minimum gas pressure obtained by the engine's gas supply system within the first preset time period after entering the transient loading state, and the difference is large. Since the transient loading state is a loading process, the value at the time of state switching is much larger than the minimum value, which indicates that there is a fault.

[0057] Among these, abnormal gas supply line malfunctions include gas supply problems such as pipe blockage or stagnation. Specifically, check the relevant components on the pipeline, such as pressure reducing valves, shut-off valves, filters, and pipes themselves.

[0058] Step S2022: If the first difference is less than or equal to the first preset difference, temporarily determine that the natural gas engine gas supply system is fault-free, and jump to the first determination step: determine whether the natural gas engine operating condition is a transient loading condition.

[0059] As mentioned above, if the first difference is less than or equal to the first preset difference, it indicates that the gas pressure when the natural gas engine changes from steady-state operating condition to transient loading condition is close to the minimum gas pressure obtained within the first preset time period after the engine's gas supply system enters the transient loading condition. At this time, it cannot be determined that there is a fault, and it is temporarily determined that there is no fault. Then, it returns to the first determination step and continues to obtain the first difference to determine the fault.

[0060] In the method embodiments of this application, such as Figure 4 As shown, step S202, determining whether there is a fault in the natural gas engine supply system based on the difference between the second reference gas pressure and the target second comparison gas pressure, includes:

[0061] Step S20201: If the second difference is less than the second preset difference, determine that the fault of the natural gas engine gas supply system is an abnormal fault of the gas supply pipeline, wherein the second difference is the difference between the target second comparison gas pressure and the second reference gas pressure.

[0062] Specifically, the second preset difference is determined based on the natural gas engine speed and intake pressure, that is, the mapping relationship between the natural gas engine speed, intake pressure and the second preset difference is pre-established.

[0063] Among these, abnormal gas supply line malfunctions include gas supply problems such as pipe blockage or stagnation. Specifically, check the relevant components on the pipeline, such as pressure reducing valves, shut-off valves, filters, and pipes themselves.

[0064] As shown above, the second difference is less than the second preset difference. The maximum value of the gas pressure obtained by the engine's gas supply system within the second preset time period after entering the transient unloading condition is small, and the difference between the gas pressure when the natural gas engine condition changes from the steady-state condition to the transient unloading condition is small. Since the transient unloading condition is an unloading process, the difference between the maximum value and the reference gas pressure is small, which indicates a fault.

[0065] Step S20202: If the second difference is greater than or equal to the second preset difference, temporarily determine that the natural gas engine gas supply system is fault-free, and jump to the second determination step: determine whether the natural gas engine operating condition is a transient unloading condition.

[0066] As mentioned above, if the second difference is greater than or equal to the second preset difference, it indicates that the maximum value of the gas pressure obtained within the second preset time period after the engine's gas supply system enters the transient unloading condition is significantly different from the gas pressure when the natural gas engine changes from the steady-state condition to the transient unloading condition. In this case, it cannot be determined that there is a fault, and it is temporarily determined that there is no fault. Then, it returns to the second determination step and continues to obtain the second difference to determine the fault.

[0067] Furthermore, the method also includes:

[0068] Construct a first MAP and a second MAP, wherein the first MAP represents the correspondence between the natural gas engine speed, intake pressure and a first preset time period, and the second MAP represents the correspondence between the natural gas engine speed, intake pressure and a first preset difference.

[0069] Based on the first MAP, the natural gas engine speed and intake pressure under the current operating conditions, determine the first preset time period under the current operating conditions;

[0070] Based on the second MAP, the natural gas engine speed and intake pressure under the current operating conditions, determine the first preset difference under the current operating conditions.

[0071] In other words, by considering the relationship between the intake pressure of the natural gas engine speed and the first preset time period and the first preset difference, the accuracy and timeliness of the diagnosis can be further improved.

[0072] Furthermore, the method also includes:

[0073] Construct a third MAP and a fourth MAP. The third MAP represents the correspondence between the natural gas engine speed, intake pressure and the second preset time period, and the fourth MAP represents the correspondence between the natural gas engine speed, intake pressure and the second preset difference.

[0074] Based on the third MAP, the natural gas engine speed and intake pressure under the current operating conditions, determine the second preset time period under the current operating conditions;

[0075] Based on the fourth MAP, the natural gas engine speed and intake pressure under the current operating conditions, determine the second preset difference under the current operating conditions.

[0076] In other words, by considering the relationship between the intake pressure of the natural gas engine speed and the second preset time period and the second preset difference, the accuracy and timeliness of the diagnosis can be further improved.

[0077] It should be noted that the first MAP, second MAP, third MAP, and fourth MAP mentioned above are only one form of expression. These relationships can also be represented in other forms, such as using curve.

[0078] Furthermore, before obtaining the reference gas pressure set and the comparison gas pressure set, the method also includes:

[0079] Determine whether the vehicle's gas supply system meets the first set of conditions and the second set of conditions. The first set of conditions includes: the remaining fuel amount in the vehicle's gas cylinder is greater than or equal to the fuel amount threshold, the gas cylinder pressure is greater than or equal to the gas cylinder pressure threshold, and there are no known gas supply system-related faults. The second set of conditions includes: the natural gas engine speed is greater than the speed threshold, the intake pressure is greater than the intake pressure threshold, and the gas pressure is greater than the gas pressure threshold.

[0080] For example, the fuel level threshold is 50%; the gas cylinder pressure threshold is 10 bar; known gas supply system-related faults include: mechanical components, electrical components, and sensor faults;

[0081] For example, the speed threshold is 1100 rpm; the intake pressure threshold is 1600 hpa; and the fuel pressure threshold is 5.5 bar.

[0082] Determine whether the natural gas engine is operating under transient conditions, and whether the transient conditions are transient loading or transient unloading conditions;

[0083] If the vehicle gas supply system meets the first set of conditions, the relevant parameters of the natural gas engine meet the second set of conditions, and the natural gas engine is in a transient operating condition, then the following acquisition steps are determined: acquire the first reference gas pressure when the natural gas engine operating condition changes from a steady-state condition to a transient loading condition, and the second reference gas pressure when the natural gas engine operating condition changes from a steady-state condition to a transient unloading condition.

[0084] As shown above, the judgment of the first and second sets of conditions is added to clarify the impact of the vehicle air supply system and engine operating parameters on the fault diagnosis of the air supply system. Preset conditions are set to provide the accuracy and timeliness of pre-diagnosis.

[0085] The method also includes: if the vehicle's air supply system meets the first set of conditions, but the engine's relevant parameters do not meet the second set of conditions, then a fault indicating weakened air supply capacity in the air supply system is identified. Furthermore, a risk of insufficient air supply under high load is indicated.

[0086] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the natural gas engine gas supply fault determination method of this application will be described in detail below with reference to specific embodiments.

[0087] Because the fuel injection quantity varies under different loads and speeds, the gas pressure will also vary, especially under transient conditions where the impact is more pronounced. During transient loading, the fuel injection quantity increases. If the gas supply system is normal, the gas pressure will drop to a certain value, then rise to a certain range and stabilize. However, if there is an anomaly in the gas supply system at this time, due to gas supply disruptions, the gas pressure will drop significantly during transient loading, and the drop will be faster than under normal conditions. Similarly, under transient unloading conditions, the fuel injection quantity decreases. Under normal circumstances, the gas pressure will quickly recover to the normal range and stabilize. However, if there is an anomaly in the gas supply system at this time, due to gas supply disruptions, the gas pressure will recover more slowly after unloading. Based on this, this embodiment relates to a specific method for determining gas supply faults in a natural gas engine, such as... Figure 5 As shown, it includes:

[0088] Step S1: Obtain parameters such as the remaining fuel quantity, cylinder pressure, engine speed, gas pressure, intake pressure, operating status, and related fault status of the gas supply system in the vehicle's gas cylinders.

[0089] Step S2: Determine whether the vehicle's air supply system meets the first set of conditions; if not, return to step S1; if yes, proceed to step S3.

[0090] Step S3: Determine whether the engine-related parameters meet the second set of conditions; if not, proceed to step S4; if yes, proceed to step S5.

[0091] Step S4: Report a fault indicating weakened gas supply capacity in the gas supply system, suggesting a risk of insufficient gas supply under high load;

[0092] Step S5: Determine whether the operating condition is a transient loading condition; if yes, perform the following steps: latch the first reference gas pressure A1 when the engine operating condition changes from steady state to transient state, record the minimum gas pressure B1 within a preset time T1 after the transient loading condition, calculate the difference C1 between gas pressure A1 and B1, and determine whether the difference C1 is greater than the first preset difference D1. If yes, proceed to step S7; otherwise, re-determine the operating condition.

[0093] Step S6: The operating condition is transient unloading condition; latch the second reference gas pressure A2 when the engine operating condition changes from steady state to transient state, record the maximum gas pressure B2 within a preset time T2 after the transient unloading condition, calculate the difference C2 between gas pressure B2 and A2, and determine whether the difference C2 is less than the second preset difference D2. If yes, proceed to step S7; otherwise, re-determine the operating condition.

[0094] Step S7: Report an abnormal fault in the gas supply line, indicating that there are problems such as blockage or obstruction in the pipeline that disrupt the gas supply.

[0095] By using relevant parameters of the vehicle and engine, combined with the characteristics of gas pressure changes under different engine operating loads, predictive diagnosis of the gas supply system is performed, enabling rapid location diagnosis of early abnormalities in the gas supply system. This allows for accurate pre-diagnosis of insufficient vehicle power caused by gas supply system abnormalities, thereby improving the reliability and responsiveness of the vehicle and engine.

[0096] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0097] This application also provides a natural gas engine gas supply fault determination device. It should be noted that this device can be used to execute the natural gas engine gas supply fault determination method provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0098] The following describes the natural gas engine gas supply fault determination device provided in the embodiments of this application.

[0099] Figure 6 This is a schematic diagram of a natural gas engine gas supply fault determination device according to an embodiment of this application. Figure 6 As shown, the device includes:

[0100] The acquisition unit 61 is used to acquire a reference gas pressure group and a comparison gas pressure group. The reference gas pressure group includes one of a first reference gas pressure and a second reference gas pressure. The first reference gas pressure is the gas pressure when the natural gas engine changes from a steady-state operating condition to a transient loading condition. The second reference gas pressure is the gas pressure when the natural gas engine changes from a steady-state operating condition to a transient unloading condition. The comparison gas pressure group includes one of a first comparison gas pressure and a second comparison gas pressure. The first comparison gas pressure is the gas pressure within a first preset time period after the natural gas engine's gas supply system enters the transient loading condition. The second comparison gas pressure is the gas pressure within a second preset time period after the gas supply system enters the transient unloading condition.

[0101] The first determining unit 62 is used to determine whether there is a fault in the natural gas engine gas supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure.

[0102] This application discloses a natural gas engine gas supply fault determination device. The acquisition unit acquires a reference gas pressure set and a comparison gas pressure set. The first determination unit determines whether there is a fault in the natural gas engine gas supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure. It considers the relationship between steady-state and transient operating conditions and gas pressure, takes into account the magnitude of the difference, and separately judges transient loading and transient unloading conditions, improving the accuracy and timeliness of natural gas engine gas supply fault diagnosis and prediction. It can pre-diagnose the early abnormal phenomenon of weakened gas supply capacity of the gas supply system and indicate the impact of this risk on subsequent high-load operation.

[0103] In the embodiments of this application, the acquisition unit includes a first acquisition module and a second acquisition module. The first acquisition module is used to acquire a target first comparison gas pressure within a first preset time period after the natural gas engine supply system enters a transient loading condition, wherein the target first comparison gas pressure is the minimum value among multiple first comparison gas pressures acquired within the first preset time period. The second acquisition module is used to acquire a target second comparison gas pressure within a second preset time period after the natural gas engine supply system enters a transient unloading condition, wherein the target second comparison gas pressure is the maximum value among multiple second comparison gas pressures acquired within the second preset time period. That is, the minimum value is taken for the transient loading condition, and the maximum value is taken for the transient unloading condition; this setting makes the judgment result more accurate and more timely.

[0104] In embodiments of this application, the first determining unit is further configured to determine whether there is a fault in the natural gas engine supply system based on the difference between a first reference gas pressure and a target first comparative gas pressure, or based on the difference between a second reference gas pressure and a target second comparative gas pressure. As configured above, since the target first comparative gas pressure is the minimum value among multiple first comparative gas pressures obtained within a first preset time period, and the target second comparative gas pressure is the maximum value among multiple second comparative gas pressures, accurate and timely prediction and diagnosis of natural gas engine supply faults can be achieved based on the difference between the first reference gas pressure and the target first comparative gas pressure, or based on the difference between the second reference gas pressure and the target second comparative gas pressure.

[0105] In the embodiments of this application, the first determining unit includes a first determining module and a second determining module. The first determining module is used to determine that the fault of the natural gas engine gas supply system is an abnormal fault of the gas supply pipeline when the first difference is greater than the first preset difference, wherein the first difference is the difference between the first reference gas pressure and the target first comparison gas pressure. The second determining module is used to temporarily determine that the natural gas engine gas supply system is fault-free when the first difference is less than or equal to the first preset difference, and jump to the first determining step: determining whether the natural gas engine operating condition is a transient loading condition. As mentioned above, if the first difference is greater than the first preset difference, it indicates that the gas pressure when the natural gas engine changes from steady-state to transient loading condition is greater than the minimum gas pressure obtained within the first preset time period after the engine's gas supply system enters transient loading condition, and the difference is large. Since transient loading condition is a loading process, the value at the time of state switching is much larger than the minimum value, indicating a fault. If the first difference is less than or equal to the first preset difference, it indicates that the gas pressure when the natural gas engine changes from steady-state to transient loading condition is close to the minimum gas pressure obtained within the first preset time period after the engine's gas supply system enters transient loading condition. At this time, a fault cannot be determined, and it is temporarily determined that there is no fault. Then, it returns to the first determination step, and the first difference is obtained again for fault judgment.

[0106] In the embodiments of this application, the first determining unit includes a third determining module and a fourth determining module. The third determining module is used to determine that the fault of the natural gas engine gas supply system is an abnormal fault of the gas supply pipeline when the second difference is less than the second preset difference, wherein the second difference is the difference between the target second comparison gas pressure and the second reference gas pressure. The fourth determining module is used to temporarily determine that the natural gas engine gas supply system is fault-free when the second difference is greater than or equal to the second preset difference, and jump to the second determining step: determining whether the natural gas engine operating condition is a transient unloading condition. As mentioned above, if the second difference is less than the second preset difference, the maximum value of the gas pressure acquired within the second preset time period after the engine's gas supply system enters the transient unloading condition is small compared to the gas pressure when the natural gas engine changes from the steady-state condition to the transient unloading condition. Since the transient unloading condition is an unloading process, the difference between the maximum value and the reference gas pressure is small, indicating a fault. If the second difference is greater than or equal to the second preset difference, the maximum value of the gas pressure acquired within the second preset time period after the engine's gas supply system enters the transient unloading condition is large compared to the gas pressure when the natural gas engine changes from the steady-state condition to the transient unloading condition. In this case, a fault cannot be determined, and it is temporarily determined that there is no fault. Then, the process returns to the second determination step, and the second difference is acquired again to determine the fault.

[0107] In embodiments of this application, the device further includes a first construction unit, a second determination unit, and a third determination unit. The first construction unit is used to construct a first MAP and a second MAP, wherein the first MAP represents the correspondence between the natural gas engine speed, intake pressure, and a first preset time period, and the second MAP represents the correspondence between the natural gas engine speed, intake pressure, and a first preset difference. The second determination unit is used to determine the first preset time period under the current operating condition based on the first MAP, the natural gas engine speed, and intake pressure under the current operating condition. The third determination unit is used to determine the first preset difference under the current operating condition based on the second MAP, the natural gas engine speed, and intake pressure under the current operating condition. In other words, by considering the relationship between the natural gas engine speed, intake pressure, the first preset time period, and the first preset difference, the accuracy and timeliness of the diagnosis are further improved.

[0108] In embodiments of this application, the device further includes a second constructing unit, a fourth determining unit, and a fifth determining unit. The second constructing unit is used to construct a third MAP and a fourth MAP, wherein the third MAP represents the correspondence between the natural gas engine speed, intake pressure, and a second preset time period, and the fourth MAP represents the correspondence between the natural gas engine speed, intake pressure, and a second preset difference. The fourth determining unit is used to determine the second preset time period under the current operating condition based on the third MAP, the natural gas engine speed, and intake pressure under the current operating condition. The fifth determining unit is used to determine the second preset difference under the current operating condition based on the fourth MAP, the natural gas engine speed, and intake pressure under the current operating condition. In other words, by considering the relationship between the natural gas engine speed, intake pressure, the second preset time period, and the second preset difference, the accuracy and timeliness of the diagnosis are further improved.

[0109] In the embodiments of this application, the device further includes a sixth determining unit, a seventh determining unit, and an eighth determining unit. The sixth determining unit is used to determine whether the vehicle gas supply system meets the first set of conditions and the second set of conditions before acquiring the reference gas pressure set and the comparison gas pressure set. The first set of conditions includes: the remaining fuel amount in the vehicle gas cylinder is greater than or equal to the fuel amount threshold, the gas cylinder pressure is greater than or equal to the gas cylinder pressure threshold, and there is currently no known gas supply system related fault. The second set of conditions includes: the natural gas engine speed is greater than the speed threshold, the intake pressure is greater than the intake pressure threshold, and the gas pressure is greater than the gas pressure threshold. The seventh determining unit is used to determine whether the natural gas engine operating condition is a transient operating condition, and the transient operating condition is a transient loading condition or a transient unloading condition. The eighth determining unit is used to determine to execute the acquisition step when the vehicle gas supply system meets the first set of conditions, the natural gas engine related parameters meet the second set of conditions, and the natural gas engine operating condition is a transient condition: acquiring the first reference gas pressure when the natural gas engine operating condition changes from a steady-state condition to a transient loading condition, and the second reference gas pressure when the natural gas engine operating condition changes from a steady-state condition to a transient unloading condition. As shown above, the judgment of the first and second sets of conditions is added to clarify the impact of the vehicle air supply system and engine operating parameters on the fault diagnosis of the air supply system. Preset conditions are set to provide the accuracy and timeliness of pre-diagnosis.

[0110] The natural gas engine gas supply fault determination device includes a processor and a memory. The aforementioned acquisition unit and first determination unit are all stored as program units in the memory, and the processor executes these program units to achieve the corresponding functions. All of the above modules are located in the same processor; alternatively, the modules may be located in different processors in any combination.

[0111] The processor contains a kernel, which retrieves the corresponding program unit from memory. One or more kernels can be configured, and adjusting kernel parameters allows for precise determination of gas supply faults in the natural gas engine.

[0112] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0113] This invention provides an electronic device, including: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include methods for performing any of the described natural gas engine gas supply fault determination methods.

[0114] This invention provides a computer-readable storage medium including a stored program, wherein the program, when running, controls the device containing the computer-readable storage medium to execute the natural gas engine gas supply fault determination method.

[0115] Specifically, the method for determining gas supply failure in a natural gas engine includes:

[0116] Step S201: Obtain the reference gas pressure set and the comparison gas pressure set;

[0117] The reference gas pressure group includes one of a first reference gas pressure and a second reference gas pressure. The first reference gas pressure is the gas pressure when the natural gas engine changes from a steady-state operating condition to a transient loading condition, and the second reference gas pressure is the gas pressure when the engine changes from a steady-state operating condition to a transient unloading condition.

[0118] The gas pressure comparison group includes one of the first gas pressure comparison and the second gas pressure comparison. The first gas pressure comparison is the gas pressure during the first preset time period after the gas supply system of the natural gas engine enters the transient loading condition, and the second gas pressure comparison is the gas pressure during the second preset time period after the gas supply system enters the transient unloading condition.

[0119] Step S202: Determine whether there is a fault in the natural gas engine gas supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure.

[0120] This invention provides a processor for running a program, wherein the program executes the natural gas engine gas supply fault determination method during runtime.

[0121] Specifically, the method for determining gas supply failure in a natural gas engine includes:

[0122] Step S201: Obtain the reference gas pressure set and the comparison gas pressure set;

[0123] The reference gas pressure group includes one of a first reference gas pressure and a second reference gas pressure. The first reference gas pressure is the gas pressure when the natural gas engine changes from a steady-state operating condition to a transient loading condition, and the second reference gas pressure is the gas pressure when the engine changes from a steady-state operating condition to a transient unloading condition.

[0124] The gas pressure comparison group includes one of the first gas pressure comparison and the second gas pressure comparison. The first gas pressure comparison is the gas pressure during the first preset time period after the gas supply system of the natural gas engine enters the transient loading condition, and the second gas pressure comparison is the gas pressure during the second preset time period after the gas supply system enters the transient unloading condition.

[0125] Step S202: Determine whether there is a fault in the natural gas engine gas supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure.

[0126] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps. The device described herein may be a server, PC, PAD, mobile phone, etc.

[0127] Step S201: Obtain the reference gas pressure set and the comparison gas pressure set;

[0128] The reference gas pressure group includes one of a first reference gas pressure and a second reference gas pressure. The first reference gas pressure is the gas pressure when the natural gas engine changes from a steady-state operating condition to a transient loading condition, and the second reference gas pressure is the gas pressure when the engine changes from a steady-state operating condition to a transient unloading condition.

[0129] The gas pressure comparison group includes one of the first gas pressure comparison and the second gas pressure comparison. The first gas pressure comparison is the gas pressure during the first preset time period after the gas supply system of the natural gas engine enters the transient loading condition, and the second gas pressure comparison is the gas pressure during the second preset time period after the gas supply system enters the transient unloading condition.

[0130] Step S202: Determine whether there is a fault in the natural gas engine gas supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure.

[0131] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps:

[0132] Step S201: Obtain the reference gas pressure set and the comparison gas pressure set;

[0133] The reference gas pressure group includes one of a first reference gas pressure and a second reference gas pressure. The first reference gas pressure is the gas pressure when the natural gas engine changes from a steady-state operating condition to a transient loading condition, and the second reference gas pressure is the gas pressure when the engine changes from a steady-state operating condition to a transient unloading condition.

[0134] The gas pressure comparison group includes one of the first gas pressure comparison and the second gas pressure comparison. The first gas pressure comparison is the gas pressure during the first preset time period after the gas supply system of the natural gas engine enters the transient loading condition, and the second gas pressure comparison is the gas pressure during the second preset time period after the gas supply system enters the transient unloading condition.

[0135] Step S202: Determine whether there is a fault in the natural gas engine gas supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure.

[0136] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0137] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0138] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0139] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0140] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0141] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0142] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, like read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0143] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0144] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0145] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0146] 1) The natural gas engine gas supply fault determination method of this application obtains a reference gas pressure set and a comparison gas pressure set, and determines whether the natural gas engine gas supply system has a fault based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure. It considers the relationship between steady-state operating conditions, transient operating conditions, and gas pressure, takes into account the magnitude of the difference, and separately judges transient loading and transient unloading operating conditions, thus improving the accuracy and timeliness of natural gas engine gas supply fault diagnosis and prediction. It can achieve early diagnosis of the early abnormal phenomenon of weakened gas supply capacity of the gas supply system and indicate the impact of this risk on subsequent high-load operation.

[0147] 2) The natural gas engine gas supply fault determination device of this application includes an acquisition unit that acquires a reference gas pressure set and a comparison gas pressure set. A first determination unit determines whether the natural gas engine gas supply system has a fault based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure. It considers the relationship between steady-state and transient operating conditions and gas pressure, takes into account the magnitude of the difference, and separately judges transient loading and transient unloading conditions, improving the accuracy and timeliness of natural gas engine gas supply fault diagnosis and prediction. It can pre-diagnose the early abnormal phenomenon of weakened gas supply capacity of the gas supply system and indicate the impact of this risk on subsequent high-load operation.

[0148] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for determining gas supply faults in a natural gas engine, characterized in that, include: A reference gas pressure set and a comparison gas pressure set are obtained. The reference gas pressure set includes one of a first reference gas pressure and a second reference gas pressure. The first reference gas pressure is the gas pressure when the natural gas engine changes from a steady-state operating condition to a transient loading condition. The second reference gas pressure is the gas pressure when the natural gas engine changes from a steady-state operating condition to a transient unloading condition. The comparison gas pressure set includes one of a first comparison gas pressure and a second comparison gas pressure. The first comparison gas pressure is the gas pressure of the natural gas engine's gas supply system during a first preset time period after entering the transient loading condition. The second comparison gas pressure is the gas pressure of the gas supply system during a second preset time period after entering the transient unloading condition. The gas supply system of the natural gas engine is determined to be faulty based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure.

2. The method according to claim 1, characterized in that, Obtain the comparison gas pressure set, including: The target first comparison gas pressure is obtained within the first preset time period after the natural gas engine gas supply system enters the transient loading condition, wherein the target first comparison gas pressure is the minimum value among multiple first comparison gas pressures obtained within the first preset time period; The target second comparison gas pressure is obtained within the second preset time period after the natural gas engine gas supply system enters the transient unloading condition, wherein the target second comparison gas pressure is the maximum value among the multiple second comparison gas pressures obtained within the second preset time period.

3. The method according to claim 2, characterized in that, Determining whether there is a fault in the natural gas engine supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure, includes: The gas supply system of the natural gas engine is determined to be faulty based on the difference between the first reference gas pressure and the target first comparative gas pressure, or based on the difference between the second reference gas pressure and the target second comparative gas pressure.

4. The method according to claim 3, characterized in that, Determining whether the natural gas engine supply system is faulty based on the difference between the first reference gas pressure and the target first comparison gas pressure includes: If the first difference is greater than the first preset difference, the fault of the natural gas engine gas supply system is determined to be an abnormal fault of the gas supply pipeline, wherein the first difference is the difference between the first reference gas pressure and the target first comparison gas pressure; If the first difference is less than or equal to the first preset difference, it is temporarily determined that the natural gas engine gas supply system is fault-free, and the process jumps to the first determination step: determining whether the natural gas engine operating condition is the transient loading condition.

5. The method according to claim 3, characterized in that, Based on the magnitude of the difference between the second reference gas pressure and the target second comparison gas pressure, determine whether the natural gas engine supply system is faulty, including: If the second difference is less than the second preset difference, the fault of the natural gas engine gas supply system is determined to be an abnormal fault of the gas supply pipeline, wherein the second difference is the difference between the target second comparison gas pressure and the second reference gas pressure; If the second difference is greater than or equal to the second preset difference, it is temporarily determined that the natural gas engine gas supply system is fault-free, and the process jumps to the second determination step: determining whether the natural gas engine operating condition is the transient unloading condition.

6. The method according to claim 4, characterized in that, The method further includes: Construct a first MAP and a second MAP, wherein the first MAP represents the correspondence between the natural gas engine speed, intake pressure and the first preset time period, and the second MAP represents the correspondence between the natural gas engine speed, intake pressure and the first preset difference. The first preset time period under the current operating condition is determined based on the first MAP, the natural gas engine speed under the current operating condition, and the intake pressure. The first preset difference under the current operating condition is determined based on the second MAP, the natural gas engine speed under the current operating condition, and the intake pressure.

7. The method according to claim 5, characterized in that, The method further includes: Construct a third MAP and a fourth MAP, wherein the third MAP represents the correspondence between the natural gas engine speed, intake pressure and the second preset time period, and the fourth MAP represents the correspondence between the natural gas engine speed, intake pressure and the second preset difference. The second preset time period under the current operating condition is determined based on the third MAP, the natural gas engine speed under the current operating condition, and the intake pressure. The second preset difference under the current operating condition is determined based on the fourth MAP, the natural gas engine speed under the current operating condition, and the intake pressure.

8. The method according to any one of claims 1 to 7, characterized in that, Before obtaining the reference gas pressure set and the comparison gas pressure set, the method further includes: Determine whether the vehicle's gas supply system meets the first set of conditions and the second set of conditions. The first set of conditions includes: the remaining fuel amount in the vehicle's gas cylinder is greater than or equal to the fuel amount threshold, the gas cylinder pressure is greater than or equal to the gas cylinder pressure threshold, and there are no known gas supply system-related faults. The second set of conditions includes: the natural gas engine speed is greater than the speed threshold, the intake pressure is greater than the intake pressure threshold, and the gas pressure is greater than the gas pressure threshold. Determine whether the natural gas engine operating condition is a transient operating condition, wherein the transient operating condition is either the transient loading condition or the transient unloading condition; If the vehicle gas supply system meets the first set of conditions, the natural gas engine parameters meet the second set of conditions, and the natural gas engine operating condition is the transient operating condition, then the following acquisition step is determined: acquire the first reference gas pressure when the natural gas engine operating condition changes from the steady-state operating condition to the transient loading operating condition, and the second reference gas pressure when the natural gas engine operating condition changes from the steady-state operating condition to the transient unloading operating condition.

9. A device for determining gas supply faults in a natural gas engine, characterized in that, include: An acquisition unit is used to acquire a reference gas pressure group and a comparison gas pressure group. The reference gas pressure group includes one of a first reference gas pressure and a second reference gas pressure. The first reference gas pressure is the gas pressure when the natural gas engine's operating condition changes from a steady-state condition to a transient loading condition. The second reference gas pressure is the gas pressure when the engine's operating condition changes from a steady-state condition to a transient unloading condition. The comparison gas pressure group includes one of a first comparison gas pressure and a second comparison gas pressure. The first comparison gas pressure is the gas pressure within a first preset time period after the natural gas engine's gas supply system enters the transient loading condition. The second comparison gas pressure is the gas pressure within a second preset time period after the gas supply system enters the transient unloading condition. The first determining unit is used to determine whether there is a fault in the natural gas engine gas supply system based on the difference between the first reference gas pressure and the first comparison gas pressure, or based on the difference between the second reference gas pressure and the second comparison gas pressure.

10. An electronic device, characterized in that, include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including methods for performing the natural gas engine gas supply fault determination method according to any one of claims 1 to 8.

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