Air leakage fault detection method, air leakage fault processing method and related device

Abstract

The present application discloses a gas leakage fault detection method, a gas leakage fault handling method and related devices, and relates to the field of engine technology. The gas leakage fault detection method includes: when the engine is in a low-load steady-state working condition, entering a fault detection state, in the fault detection state, obtaining the driving duty cycle of the electric pressure regulating valve, obtaining the lower limit value of the driving duty cycle of the electric pressure regulating valve under the current working condition, if the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working condition, and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0, then it is determined that the electric pressure regulating valve has a gas leakage fault. The technical solution disclosed in the present application can detect whether the electric pressure regulating valve has a gas leakage fault without disassembling the engine.

Description

Technical Field

[0001] The present application belongs to the field of engine technology, and in particular relates to a gas leakage fault detection method, a gas leakage fault processing method and related devices. Background Art

[0002] The turbocharger is an important part of the engine's air intake system. The turbocharger includes a turbine and a compressor. The turbine is set on the engine's exhaust pipe, and the compressor is set on the engine's intake pipe. The turbine and the compressor are connected through an intermediate body. The exhaust gas discharged by the engine enters the turbine, drives the turbine in the turbine to rotate, and then drives the impeller in the compressor to rotate through the intermediate body. The impeller pressurizes the air in the intake pipe, and the pressurized air enters the engine's cylinder.

[0003] In order to protect the turbocharger, a bypass pipeline is set between the air inlet and outlet of the turbine, and a bleed valve is set on the bypass pipeline. When the pressure in the compressor is too high, the bleed valve is opened to allow part of the exhaust gas to be discharged directly without passing through the turbine, so as to reduce the speed of the turbine and thus reduce the pressure in the compressor.

[0004] The bleed valve usually adopts a pneumatic regulating valve. In order to achieve precise control of the bleed valve, an electric pressure regulating valve is set for the bleed valve. The air inlet of the electric pressure regulating valve is connected to the air source, and the air outlet is connected to the control port of the bleed valve. By adjusting the opening of the electric pressure regulating valve, the pressure of the gas entering the control port of the bleed valve is controlled, thereby adjusting the opening of the bleed valve.

[0005] If the electric pressure regulating valve has a leakage problem, it will directly affect the opening adjustment of the air release valve. How to detect whether the electric pressure regulating valve has a leakage fault without disassembling the engine is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] In view of this, the purpose of the present application is to provide a gas leakage fault detection method and related devices, which can detect whether an electric pressure regulating valve has a gas leakage fault without disassembling the engine. The present application also provides a gas leakage fault handling method and related devices, which can detect whether an electric pressure regulating valve has a gas leakage fault without disassembling the engine, and solve the problem of poor control effect on the air release valve caused by the gas leakage fault of the electric pressure regulating valve.

[0007] To achieve the above objectives, this application provides the following technical solutions:

[0008] A first aspect of the present application provides a method for detecting an air leakage fault, wherein an air inlet of an electric pressure regulating valve is connected to an air source, and an air outlet of the electric pressure regulating valve is connected to a control port of an air bleed valve of a turbocharger, and the method for detecting an air leakage fault comprises:

[0009] Obtaining engine operating parameters;

[0010] Entering a fault detection state when the operating parameters of the engine indicate that the engine is in a low-load steady-state operating condition;

[0011] In the fault detection state, the driving duty ratio of the electric pressure regulating valve is obtained, and the lower limit value of the driving duty ratio of the electric pressure regulating valve under the current working condition is determined, wherein the driving duty ratio of the electric pressure regulating valve is adjusted based on the actual pressure of the intake manifold of the engine and the target pressure, and when the actual pressure of the intake manifold is less than the target pressure, the driving duty ratio of the electric pressure regulating valve is gradually reduced;

[0012] If the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working condition, and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0, it is determined that the electric pressure regulating valve has an air leakage fault.

[0013] In a possible implementation, when the operating parameters of the engine meet the following conditions, it is determined that the engine is in a low-load steady-state operating condition:

[0014] The actual speed of the engine is less than a first speed threshold, the actual fuel injection amount of the engine is less than a first fuel injection amount threshold, the actual speed change rate of the engine is less than a first change rate threshold, and the actual fuel injection amount change rate of the engine is less than a second change rate threshold.

[0015] In a possible implementation, determining the lower limit of the driving duty cycle of the electric pressure regulating valve under the current working condition includes:

[0016] Obtaining current operating parameters, wherein the operating parameters include environmental parameters and operating parameters of the engine;

[0017] Based on the pre-established correspondence between the operating condition parameter and the lower limit value of the driving duty cycle, the lower limit value of the driving duty cycle corresponding to the current operating condition parameter is obtained.

[0018] In a possible implementation, after determining that the electric pressure regulating valve has an air leakage fault, the method further includes:

[0019] Entering a fault verification state when the operating parameters of the engine indicate that the engine is in a high-load steady-state operating condition;

[0020] In the fault verification state, obtaining a driving duty cycle of the electric pressure regulating valve, and determining a lower limit value of the driving duty cycle of the electric pressure regulating valve under a current working condition;

[0021] If the difference between the driving duty cycle of the electric pressure regulating valve and the lower limit value under the current working condition is within the allowable range, it is determined that the air leakage fault of the electric pressure regulating valve is caused by the wear of the valve core of the electric pressure regulating valve.

[0022] In a possible implementation, when the operating parameters of the engine meet the following conditions, it is determined that the engine is in a high-load steady-state operating condition:

[0023] The actual speed of the engine is greater than the second speed threshold, the actual fuel injection amount of the engine is greater than the second fuel injection amount threshold, the actual speed change rate of the engine is less than the first change rate threshold, and the actual fuel injection amount change rate of the engine is less than the second change rate threshold.

[0024] A second aspect of the present application provides a gas leakage fault detection device, wherein an air inlet of an electric pressure regulating valve is connected to an air source, and an air outlet of the electric pressure regulating valve is connected to a control port of an air release valve of a turbocharger, and the gas leakage fault detection device comprises:

[0025] An operating parameter acquisition module is used to obtain the operating parameters of the engine;

[0026] A first state decision module, configured to enter a fault detection state when the operating parameters of the engine indicate that the engine is in a low-load steady-state operating condition;

[0027] a first lower limit value determination module, configured to obtain the driving duty ratio of the electric pressure regulating valve in the fault detection state, and determine the lower limit value of the driving duty ratio of the electric pressure regulating valve in the current working condition, wherein the driving duty ratio of the electric pressure regulating valve is adjusted based on the actual pressure of the intake manifold of the engine and the target pressure, and when the actual pressure of the intake manifold is less than the target pressure, the driving duty ratio of the electric pressure regulating valve is gradually reduced;

[0028] The air leakage fault determination module is used to determine that the electric pressure regulating valve has an air leakage fault when the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working conditions and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0.

[0029] The third aspect of the present application provides a method for handling an air leakage fault, wherein an air inlet of an electric pressure regulating valve is connected to an air source, an air outlet of the electric pressure regulating valve is connected to a control port of an air bleed valve of a turbocharger, and a proportional regulating valve is arranged on a pipeline connecting the air outlet of the electric pressure regulating valve and the control port of the air bleed valve. The method for handling an air leakage fault comprises:

[0030] Obtaining engine operating parameters;

[0031] Entering a fault detection state when the operating parameters of the engine indicate that the engine is in a low-load steady-state operating condition;

[0032] In the fault detection state, the driving duty ratio of the electric pressure regulating valve is obtained, and the lower limit value of the driving duty ratio of the electric pressure regulating valve under the current working condition is determined, wherein the driving duty ratio of the electric pressure regulating valve is adjusted based on the actual pressure of the intake manifold of the engine and the target pressure, and when the actual pressure of the intake manifold is less than the target pressure, the driving duty ratio of the electric pressure regulating valve is gradually reduced;

[0033] If the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working condition, and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0, it is determined that the electric pressure regulating valve has an air leakage fault;

[0034] The opening of the proportional control valve is adjusted with the goal of making the actual pressure of the intake manifold of the engine reach the target pressure.

[0035] A fourth aspect of the present application provides a gas leakage fault processing device, wherein an air inlet of an electric pressure regulating valve is connected to an air source, an air outlet of the electric pressure regulating valve is connected to a control port of an air release valve of a turbocharger, and a proportional regulating valve is arranged on a pipeline connecting the air outlet of the electric pressure regulating valve and the control port of the air release valve, and the gas leakage fault processing device comprises:

[0036] An operating parameter acquisition module is used to obtain the operating parameters of the engine;

[0037] A first state decision module, configured to enter a fault detection state when the operating parameters of the engine indicate that the engine is in a low-load steady-state operating condition;

[0038] a first lower limit value determination module, configured to obtain the driving duty ratio of the electric pressure regulating valve in the fault detection state, and determine the lower limit value of the driving duty ratio of the electric pressure regulating valve in the current working condition, wherein the driving duty ratio of the electric pressure regulating valve is adjusted based on the actual pressure of the intake manifold of the engine and the target pressure, and when the actual pressure of the intake manifold is less than the target pressure, the driving duty ratio of the electric pressure regulating valve is gradually reduced;

[0039] A gas leakage fault determination module, configured to determine that the electric pressure regulating valve has a gas leakage fault when the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working condition and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0;

[0040] The air leakage fault compensation module is used to adjust the opening of the proportional control valve with the goal of making the actual pressure of the intake manifold of the engine reach the target pressure.

[0041] A fifth aspect of the present application provides an electronic device, comprising at least one processor and a memory connected to the processor, wherein:

[0042] The memory is used to store computer programs;

[0043] The processor is used to execute the computer program so that the electronic device can implement any one of the above-mentioned air leakage fault detection methods, or implement the above-mentioned air leakage fault processing method.

[0044] The sixth aspect of the present application is a computer storage medium, which carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any of the above-mentioned air leakage fault detection methods, or implement the above-mentioned air leakage fault processing methods.

[0045] A seventh aspect of the present application is a computer program product, comprising computer-readable instructions, which, when executed on an electronic device, enables the electronic device to implement any one of the above-mentioned air leakage fault detection methods, or implement the above-mentioned air leakage fault processing method.

[0046] It can be seen that the beneficial effects of this application are:

[0047] The air leakage fault detection method disclosed in the present application is based on the discovery that under the same operating conditions, the driving duty cycle of an electric pressure regulating valve when an air leakage fault occurs will be smaller than the driving duty cycle of the electric pressure regulating valve when no air leakage fault occurs. The method enters a fault detection state when the engine is in a low-load steady-state operating condition. In the fault detection state, the driving duty cycle of the electric pressure regulating valve is obtained, and the lower limit value of the driving duty cycle of the electric pressure regulating valve under the current operating condition is obtained. If the driving duty cycle of the electric pressure regulating valve is smaller than the lower limit value under the current operating condition, and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0, it is determined that the electric pressure regulating valve has an air leakage fault. The method can detect whether the electric pressure regulating valve has an air leakage fault without disassembling the engine.

[0048] The air leakage fault handling method disclosed in the present application can detect whether an electric pressure regulating valve has an air leakage fault without disassembling the engine; in addition, a proportional control valve is arranged on the pipeline connecting the air outlet of the electric pressure regulating valve and the control port of the air release valve, and when it is determined that the electric pressure regulating valve has an air leakage fault, the opening of the proportional control valve is adjusted so as to make the actual pressure of the engine's intake manifold reach the target pressure, thereby solving the problem of poor control effect on the air release valve caused by the air leakage fault of the electric pressure regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0050] Figure 1 A flow chart of a gas leakage fault detection method disclosed in the present application;

[0051] Figure 2 A flow chart of a method for handling air leakage faults disclosed in the present application;

[0052] Figure 3 This is a structural schematic diagram of a gas leakage fault detection device disclosed in this application;

[0053] Figure 4 This is a structural schematic diagram of a gas leakage fault processing device disclosed in the present application;

[0054] Figure 5 This is a hardware structure diagram of an electronic device disclosed in this application. DETAILED DESCRIPTION

[0055] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0056] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is only to describe the distinction mode adopted by the objects of the same attributes when describing in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0057] The engine intake system includes a turbocharger. The turbocharger includes a turbine and a compressor. The turbine is arranged on the exhaust pipe of the engine, and the compressor is arranged on the intake pipe of the engine. The turbine and the compressor are connected through an intermediate body. The exhaust gas discharged by the engine enters the turbine, drives the turbine in the turbine to rotate, and then drives the impeller in the compressor to rotate through the intermediate body. The impeller pressurizes the air in the intake pipe, and the pressurized air enters the cylinder of the engine.

[0058] A bypass pipeline is provided between the air inlet and the air outlet of the turbine, and a bleed valve is provided on the bypass pipeline. When the pressure in the compressor is too high, the bleed valve is opened so that part of the exhaust gas is discharged directly without passing through the turbine, so as to reduce the speed of the turbine and further reduce the pressure in the compressor. The bleed valve usually adopts a pneumatic regulating valve. In order to achieve precise control of the bleed valve, an electric pressure regulating valve is provided for the bleed valve. The air inlet of the electric pressure regulating valve is connected to the gas source (for providing high-pressure gas), and the air outlet is connected to the control port of the bleed valve. By adjusting the opening of the electric pressure regulating valve, the pressure of the gas entering the control port of the bleed valve is controlled, thereby adjusting the opening of the bleed valve.

[0059] The present application provides a gas leakage fault detection method and related devices, which can detect whether an electric pressure regulating valve has a gas leakage fault without disassembling the engine. The present application also provides a gas leakage fault handling method and related devices, which can detect whether an electric pressure regulating valve has a gas leakage fault without disassembling the engine, and solve the problem of poor control effect on the air release valve caused by the gas leakage fault of the electric pressure regulating valve.

[0060] See also Figure 1 , Figure 1 This is a flow chart of a gas leakage fault detection method disclosed in this application. The method includes:

[0061] S101: Obtaining engine operating parameters.

[0062] S102: When the operating parameters of the engine indicate that the engine is in a low-load steady-state condition, entering a fault detection state.

[0063] Based on the operating parameters of the engine, the load state of the engine can be determined, and whether the engine is in a steady state can be determined. When it is determined that the engine is in a low-load steady state, a fault detection state is entered to determine whether the electric pressure regulating valve has a gas leakage fault.

[0064] As an optional solution, obtaining the operating parameters of the engine includes: obtaining the actual speed of the engine. Accordingly, when the operating parameters of the engine meet the following conditions, it is determined that the engine is in a low-load steady-state condition: the actual speed of the engine is less than a first speed threshold, and the actual speed change rate of the engine is less than a first change rate threshold.

[0065] As another optional solution, obtaining the operating parameters of the engine includes: obtaining the actual speed and actual fuel injection amount of the engine. Accordingly, when the operating parameters of the engine meet the following conditions, it is determined that the engine is in a low-load steady-state condition: the actual speed of the engine is less than a first speed threshold, the actual fuel injection amount of the engine is less than a first fuel injection amount threshold, the actual speed change rate of the engine is less than a first change rate threshold, and the actual fuel injection amount change rate of the engine is less than a second change rate threshold.

[0066] It should be noted that the first speed threshold, the first fuel injection amount threshold, the first change rate threshold and the second change rate threshold in the above two solutions are values ​​determined based on multiple tests.

[0067] S103: In a fault detection state, obtaining a driving duty cycle of the electric pressure regulating valve, and determining a lower limit value of the driving duty cycle of the electric pressure regulating valve under a current working condition.

[0068] Among them, the control device adjusts the driving duty cycle of the electric pressure regulating valve in the following manner: the driving duty cycle of the electric pressure regulating valve is adjusted based on the actual pressure of the intake manifold of the engine and the target pressure, and when the actual pressure of the intake manifold is lower than the target pressure, the driving duty cycle of the electric pressure regulating valve is gradually reduced.

[0069] Here the relationship between the driving duty cycle of the electric pressure regulating valve and the actual pressure of the intake manifold is explained: increase the driving duty cycle of the electric pressure regulating valve - increase the opening of the electric pressure regulating valve - increase the outlet pressure of the electric pressure regulating valve - increase the opening of the bleed valve - reduce the exhaust gas passing through the turbine - reduce the pressure of the intake manifold; reduce the driving duty cycle of the electric pressure regulating valve - reduce the opening of the electric pressure regulating valve - reduce the outlet pressure of the electric pressure regulating valve - reduce the opening of the bleed valve - increase the exhaust gas passing through the turbine - increase the pressure of the intake manifold.

[0070] The opening of the valve refers to the position of the valve core (or valve plate) when the valve core (or valve plate) changes the throttling area of ​​the flow channel. It is usually expressed as a percentage, and can also be understood as the percentage of the cross-sectional area that can flow. The closed state is usually understood to be 0 and the fully open state is 100%.

[0071] The control device adjusts the driving duty ratio of the electric pressure regulating valve with the goal of making the actual pressure of the intake manifold reach the target pressure. The control device obtains the actual pressure of the intake manifold of the engine, obtains the target pressure of the intake manifold of the engine, and performs PID (proportional integral differential) control based on the actual pressure of the intake manifold and the target pressure to adjust the driving duty ratio of the electric pressure regulating valve.

[0072] The actual pressure of the intake manifold can be obtained by a pressure detection component arranged in the intake manifold.

[0073] The target intake manifold pressure is determined based on the engine operating parameters.

[0074] As an optional solution, the target pressure of the intake manifold is determined based on the actual speed of the engine. Optionally, a correspondence between the speed of the engine and the target pressure of the intake manifold is pre-established, and the target pressure of the intake manifold is determined based on the actual speed of the engine and the correspondence.

[0075] As another optional solution, the target pressure of the intake manifold is determined based on the actual engine speed and the actual fuel injection amount. Optionally, a correspondence between the engine speed and the fuel injection amount and the target pressure of the intake manifold is pre-established, and the target pressure of the intake manifold is determined based on the actual engine speed and the actual fuel injection amount and the correspondence.

[0076] The control device performs PID control based on the actual pressure of the intake manifold and the target pressure. If the actual pressure of the intake manifold is less than the target pressure, the control device reduces the driving duty ratio of the electric pressure regulating valve. After the control device performs the operation of reducing the driving duty ratio of the electric pressure regulating valve, if the actual pressure of the intake manifold is still less than the target pressure, the control device will again perform the operation of reducing the driving duty ratio of the electric pressure regulating valve until the actual pressure of the intake manifold reaches the target pressure.

[0077] It is understandable that, in the case where the electric pressure regulating valve does not have a gas leakage fault, the control device performs the operation of reducing the driving duty ratio of the electric pressure regulating valve, which will cause the actual pressure of the intake manifold to rise. In the case where the electric pressure regulating valve has a gas leakage fault, the pressure at the outlet of the electric pressure regulating valve will increase, which increases the opening of the vent valve, thereby causing the pressure of the intake manifold to decrease. Therefore, in the case where the electric pressure regulating valve has a gas leakage fault, the control device performs the operation of reducing the driving duty ratio of the electric pressure regulating valve, which may not cause the actual pressure of the intake manifold to rise, or the actual pressure of the intake manifold can only rise by a small amplitude. Based on this, the control device will perform the operation of reducing the driving duty ratio of the electric pressure regulating valve multiple times, resulting in the following phenomenon: under the same working conditions, the driving duty ratio of the electric pressure regulating valve in the case of a gas leakage fault will be smaller than the driving duty ratio of the electric pressure regulating valve in the case of no gas leakage fault.

[0078] Based on this discovery, in the fault detection state, that is, when the engine is in a low-load steady-state condition, by comparing the driving duty cycle of the electric pressure regulating valve and the lower limit of the driving duty cycle of the electric pressure regulating valve under the current working condition, it is determined whether the electric pressure regulating valve has a leakage fault. Among them, the lower limit of the driving duty cycle of the electric pressure regulating valve under any working condition is determined based on the operating parameters of the electric pressure regulating valve in a normal state. It can be understood that the electric pressure regulating valve in a normal state refers to an electric pressure regulating valve that has not failed. In implementation, a new electric pressure regulating valve can be installed in the engine intake system, and the lower limit of the driving duty cycle of the electric pressure regulating valve under various working conditions can be determined based on the operating parameters of the electric pressure regulating valve.

[0079] As an optional solution, determining the lower limit of the driving duty cycle of the electric pressure regulating valve under the current working condition includes:

[0080] Based on the pre-established correspondence between the operating parameters of the engine and the lower limit value of the driving duty ratio, the lower limit value of the driving duty ratio corresponding to the current operating parameters of the engine is obtained.

[0081] In implementation, the following scheme may be used to construct a corresponding relationship between the engine operating parameters and the lower limit of the driving duty cycle:

[0082] Set multiple operating parameter calibration points;

[0083] For each operating parameter calibration point, a plurality of standard engines are respectively controlled to operate at the operating parameter calibration point, the driving duty ratios of the plurality of standard engines at the operating parameter calibration point are obtained, and a lower limit value of the driving duty ratio at the operating parameter calibration point is determined based on the driving duty ratios of the plurality of standard engines at the operating parameter calibration point;

[0084] Based on a plurality of operating parameter calibration points and corresponding lower limits of the driving duty cycle, a corresponding relationship between the operating parameters of the engine and the lower limits of the driving duty cycle is constructed.

[0085] Optionally, the minimum value of the driving duty cycle of multiple standard engines at the operating parameter calibration point is determined as the lower limit value of the driving duty cycle at the operating parameter calibration point.

[0086] Optionally, an interpolation operation is performed based on a plurality of operating parameter calibration points and corresponding lower limit values ​​of the driving duty cycle to construct a corresponding relationship between the operating parameters of the engine and the lower limit value of the driving duty cycle.

[0087] Optionally, the operating parameter calibration point includes the engine speed value. Optionally, the operating parameter calibration point includes the engine speed value and the fuel injection amount.

[0088] It can be understood that if the operating parameter calibration point only includes the engine speed value, then what is constructed is the corresponding relationship between the engine speed and the lower limit of the driving duty cycle. Accordingly, based on the actual engine speed and the corresponding relationship, the lower limit of the driving duty cycle of the electric pressure regulating valve under the current working condition is determined. If the operating parameter calibration point includes the engine speed value and the injection amount, then what is constructed is the corresponding relationship between the engine speed and the injection amount and the lower limit of the driving duty cycle. Accordingly, based on the actual engine speed value and the actual injection amount, and the corresponding relationship, the lower limit of the driving duty cycle of the electric pressure regulating valve under the current working condition is determined.

[0089] As another optional solution, determining the lower limit value of the driving duty cycle of the electric pressure regulating valve under the current working condition includes:

[0090] Obtaining current operating parameters, which include environmental parameters and engine operating parameters;

[0091] Based on the pre-established correspondence between the operating condition parameter and the lower limit value of the driving duty cycle, the lower limit value of the driving duty cycle corresponding to the current operating condition parameter is obtained.

[0092] Optionally, the environmental parameter includes at least one of an environmental pressure and an environmental temperature. Optionally, the operating parameter of the engine includes a rotation speed of the engine and may also include a fuel injection amount of the engine.

[0093] In implementation, the following scheme can be used to construct the corresponding relationship between the operating condition parameter and the lower limit value of the driving duty cycle:

[0094] Set multiple operating parameter calibration points;

[0095] Under a standard environment, for each operating parameter calibration point, a plurality of standard engines are respectively controlled to operate at the operating parameter calibration point, the driving duty ratios of the plurality of standard engines at the operating parameter calibration point are obtained, and a lower limit value of the driving duty ratio at the operating parameter calibration point is determined based on the driving duty ratios of the plurality of standard engines at the operating parameter calibration point;

[0096] Based on a plurality of operating parameter calibration points and corresponding lower limits of the driving duty cycle, a corresponding relationship between the operating parameters of the engine under a standard environment and the lower limit of the driving duty cycle is established;

[0097] Based on the environmental correction coefficient, the correspondence between the operating parameters of the engine under the standard environment and the lower limit of the drive duty cycle is corrected to obtain the correspondence between the operating parameters of the engine under different environments and the lower limit of the drive duty cycle, that is, the correspondence between the operating parameters and the lower limit of the drive duty cycle.

[0098] Wherein, the environmental correction coefficient includes at least one of an environmental pressure correction coefficient and an environmental temperature correction coefficient. That is to say, the corresponding relationship between the operating parameters of the engine under the standard environment and the lower limit of the driving duty cycle can be corrected only based on the environmental pressure correction coefficient, and accordingly, what is obtained is: the corresponding relationship between the operating parameters of the engine under different environmental pressures and the lower limit of the driving duty cycle. The corresponding relationship between the operating parameters of the engine under the standard environment and the lower limit of the driving duty cycle can be corrected only based on the environmental temperature correction coefficient, and accordingly, what is obtained is: the corresponding relationship between the operating parameters of the engine under different ambient temperatures and the lower limit of the driving duty cycle. The corresponding relationship between the operating parameters of the engine under the standard environment and the lower limit of the driving duty cycle can be corrected based on the environmental pressure correction coefficient and the environmental temperature correction coefficient, and accordingly, what is obtained is: the corresponding relationship between the operating parameters of the engine and the lower limit of the driving duty cycle under different combinations of environmental pressures and ambient temperatures.

[0099] S104: If the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working condition, and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0, it is determined that the electric pressure regulating valve has a leakage fault.

[0100] Under the same working conditions, the driving duty cycle of the electric pressure regulating valve when a gas leakage fault occurs will be smaller than the driving duty cycle of the electric pressure regulating valve when no gas leakage fault occurs. Therefore, if the driving duty cycle of the electric pressure regulating valve is smaller than the lower limit value under the current working conditions, and the absolute value of the difference between the two is larger than the preset value, it is determined that the electric pressure regulating valve has a gas leakage fault. If the driving duty cycle of the electric pressure regulating valve is smaller than the lower limit value under the current working conditions, and the driving duty cycle of the electric pressure regulating valve is 0, it is determined that the electric pressure regulating valve has a gas leakage fault.

[0101] The air leakage fault detection method disclosed in the present application is based on the discovery that under the same operating conditions, the driving duty cycle of an electric pressure regulating valve when an air leakage fault occurs will be smaller than the driving duty cycle of the electric pressure regulating valve when no air leakage fault occurs. The method enters a fault detection state when the engine is in a low-load steady-state operating condition. In the fault detection state, the driving duty cycle of the electric pressure regulating valve is obtained, and the lower limit value of the driving duty cycle of the electric pressure regulating valve under the current operating condition is obtained. If the driving duty cycle of the electric pressure regulating valve is smaller than the lower limit value under the current operating condition, and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0, it is determined that the electric pressure regulating valve has an air leakage fault. The method can detect whether the electric pressure regulating valve has an air leakage fault without disassembling the engine.

[0102] In another embodiment of the gas leakage fault detection method disclosed in the present application, after determining that the electric pressure regulating valve has a gas leakage fault, the following steps are further set:

[0103] When the operating parameters of the engine indicate that the engine is in a high-load steady-state condition, the fault verification state is entered;

[0104] In the fault verification state, the driving duty cycle of the electric pressure regulating valve is obtained, and the lower limit value of the driving duty cycle of the electric pressure regulating valve under the current working condition is determined;

[0105] If the difference between the driving duty cycle of the electric pressure regulating valve and the lower limit value under the current working condition is within the allowable range, it is determined that the air leakage fault of the electric pressure regulating valve is caused by the wear of the valve core of the electric pressure regulating valve.

[0106] As an optional scheme, the engine is determined to be in a high-load steady-state condition when the engine operating parameters meet the following conditions: the actual engine speed is greater than the second speed threshold, and the actual engine speed change rate is less than the first change rate threshold.

[0107] As another optional scheme, the engine is determined to be in a high-load steady-state condition when the engine operating parameters meet the following conditions: the actual engine speed is greater than a second speed threshold, the actual fuel injection amount of the engine is greater than the second fuel injection amount threshold, the actual engine speed change rate is less than the first change rate threshold, and the actual fuel injection amount change rate of the engine is less than the second change rate threshold.

[0108] It should be noted that the second speed threshold, the second fuel injection amount threshold, the first change rate threshold and the second change rate threshold in the above two solutions are values ​​determined based on multiple tests.

[0109] In the fault verification state, the lower limit value of the driving duty cycle of the electric pressure regulating valve under the current working condition is determined. The solution disclosed in the previous article can be referred to and will not be described in detail here.

[0110] When the engine is in a low-load steady-state condition, the exhaust energy and exhaust pressure of the engine are low, and the target opening of the electric pressure regulating valve (i.e., the opening of the electric pressure regulating valve required to make the actual pressure of the engine's intake manifold reach the target pressure) is low. If the valve core of the electric pressure regulating valve is worn, the control device may not be able to make the electric pressure regulating valve reach the target opening even if it repeatedly performs the operation of reducing the driving duty cycle of the electric pressure regulating valve. When the engine is in a high-load steady-state condition, the exhaust energy and exhaust pressure of the engine are high, and the target opening of the electric pressure regulating valve is high. Even if the valve core of the voltage pressure regulating valve is worn, the control device can make the electric pressure regulating valve reach the target opening by performing the operation of reducing the driving duty cycle of the electric pressure regulating valve, that is, the difference between the driving duty cycle of the electric pressure regulating valve and the lower limit value of the driving duty cycle under the current working condition is small. Based on this, when it is determined that the electric pressure regulating valve has an air leakage fault, the engine is in a high-load steady-state operating condition. If the difference between the driving duty cycle of the electric pressure regulating valve and the lower limit value under the current operating condition is within the allowable range, it is determined that the air leakage fault of the electric pressure regulating valve is caused by wear of the valve core of the electric pressure regulating valve.

[0111] See also Figure 2 , Figure 2 This is a flow chart of a method for handling air leakage faults disclosed in this application.

[0112] Among them, in the engine intake system, the air inlet of the electric pressure regulating valve is connected to the air source, the air outlet of the electric pressure regulating valve is connected to the control port of the turbocharger's air bleed valve, and a proportional regulating valve is arranged on the pipeline connecting the air outlet of the electric pressure regulating valve and the control port of the air bleed valve.

[0113] The air leakage troubleshooting method includes:

[0114] S201: Obtaining engine operating parameters.

[0115] S202: When the operating parameters of the engine indicate that the engine is in a low-load steady-state condition, entering a fault detection state.

[0116] S203: In the fault detection state, obtaining the driving duty cycle of the electric pressure regulating valve, and determining the lower limit value of the driving duty cycle of the electric pressure regulating valve under the current working condition.

[0117] Among them, the control device adjusts the driving duty cycle of the electric pressure regulating valve in the following manner: the driving duty cycle of the electric pressure regulating valve is adjusted based on the actual pressure of the intake manifold of the engine and the target pressure, and when the actual pressure of the intake manifold is lower than the target pressure, the driving duty cycle of the electric pressure regulating valve is gradually reduced.

[0118] S204: If the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working condition, and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0, it is determined that the electric pressure regulating valve has a leakage fault.

[0119] S205: Adjust the opening of the proportional control valve so that the actual pressure of the engine intake manifold reaches the target pressure.

[0120] Optionally, PID control is performed based on the actual pressure and target pressure of the intake manifold of the engine to adjust the opening of the proportional control valve.

[0121] For the specific implementation of steps S201 to S204, please refer to the description of steps S101 to S104 in the above text.

[0122] The air leakage fault processing method disclosed in the above application is based on the discovery that under the same working conditions, the driving duty cycle of the electric pressure regulating valve when an air leakage fault occurs will be smaller than the driving duty cycle of the electric pressure regulating valve when no air leakage fault occurs. When the engine is in a low-load steady-state working condition, the fault detection state is entered. In the fault detection state, the driving duty cycle of the electric pressure regulating valve is obtained, and the lower limit value of the driving duty cycle of the electric pressure regulating valve under the current working condition is obtained. If the driving duty cycle of the electric pressure regulating valve is smaller than the lower limit value under the current working condition, and the absolute value of the difference between the two is greater than the predicted value, the electric pressure regulating valve will be automatically turned off. If the numerical value or the driving duty cycle of the electric pressure regulating valve is 0, it is determined that the electric pressure regulating valve has an air leakage fault, and whether the electric pressure regulating valve has an air leakage fault can be detected without disassembling the engine; in addition, a proportional control valve is set on the pipeline connecting the air outlet of the electric pressure regulating valve and the control port of the air release valve. When it is determined that the electric pressure regulating valve has an air leakage fault, the opening of the proportional control valve is adjusted so as to make the actual pressure of the engine's intake manifold reach the target pressure, thereby solving the problem of poor control effect of the air release valve caused by the air leakage fault of the electric pressure regulating valve.

[0123] Optional, in Figure 2 Based on the air leakage fault handling method shown in the figure, after determining that the electric pressure regulating valve has an air leakage fault, the following steps are further set:

[0124] When the engine's operating parameters indicate that the engine is in a high-load steady-state condition, the fault verification state is entered; in the fault verification state, the driving duty cycle of the electric pressure regulating valve is obtained, and the lower limit value of the driving duty cycle of the electric pressure regulating valve under the current condition is determined; if the difference between the driving duty cycle of the electric pressure regulating valve and the lower limit value under the current condition is within the allowable range, it is determined that the air leakage fault of the electric pressure regulating valve is caused by the wear of the valve core of the electric pressure regulating valve.

[0125] The present application discloses a gas leakage fault detection method, and accordingly, the present application also discloses a gas leakage fault detection device to implement the gas leakage fault detection method.

[0126] See also Figure 3 , Figure 3 The present invention discloses a structure diagram of a gas leakage fault detection device. The gas leakage fault detection device comprises:

[0127] An operating parameter acquisition module 10 is used to obtain operating parameters of the engine;

[0128] The first state decision module 20 is used to enter a fault detection state when the operating parameters of the engine indicate that the engine is in a low-load steady state;

[0129] A first lower limit value determination module 30 is used to obtain the driving duty ratio of the electric pressure regulating valve in a fault detection state, and determine the lower limit value of the driving duty ratio of the electric pressure regulating valve in a current working condition, wherein the driving duty ratio of the electric pressure regulating valve is adjusted based on the actual pressure of the intake manifold of the engine and the target pressure, and when the actual pressure of the intake manifold is less than the target pressure, the driving duty ratio of the electric pressure regulating valve is gradually reduced;

[0130] The air leakage fault determination module 40 is used to determine that the electric pressure regulating valve has an air leakage fault when the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working condition and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0.

[0131] The air leakage fault detection device disclosed in the present application is based on the discovery that under the same operating conditions, the driving duty cycle of an electric pressure regulating valve when an air leakage fault occurs will be smaller than the driving duty cycle of the electric pressure regulating valve when no air leakage fault occurs. When the engine is in a low-load steady-state operating condition, the device enters a fault detection state. In the fault detection state, the driving duty cycle of the electric pressure regulating valve is obtained, and the lower limit value of the driving duty cycle of the electric pressure regulating valve under the current operating condition is obtained. If the driving duty cycle of the electric pressure regulating valve is smaller than the lower limit value under the current operating condition, and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0, it is determined that the electric pressure regulating valve has an air leakage fault, and whether the electric pressure regulating valve has an air leakage fault is detected without disassembling the engine.

[0132] In a possible implementation, the operating parameter acquisition module 10 obtains the actual speed of the engine. Accordingly, the first state decision module 20 determines that the engine is in a low-load steady-state condition when the operating parameters of the engine meet the following conditions: the actual speed of the engine is less than the first speed threshold, and the actual speed change rate of the engine is less than the first change rate threshold.

[0133] In a possible implementation, the operating parameter acquisition module 10 obtains the actual speed and actual fuel injection amount of the engine. Accordingly, the first state decision module 20 determines that the engine is in a low-load steady-state condition when the operating parameters of the engine meet the following conditions: the actual speed of the engine is less than the first speed threshold, the actual fuel injection amount of the engine is less than the first fuel injection amount threshold, the actual speed change rate of the engine is less than the first change rate threshold, and the actual fuel injection amount change rate of the engine is less than the second change rate threshold.

[0134] In one possible implementation, the first lower limit value determination module 30 determines the lower limit value of the driving duty cycle of the electric pressure regulating valve under the current operating conditions, including: based on a pre-constructed correspondence between the engine operating parameters and the lower limit value of the driving duty cycle, obtaining the lower limit value of the driving duty cycle corresponding to the current operating parameters of the engine.

[0135] In one possible implementation, the first lower limit value determination module 30 determines the lower limit value of the driving duty cycle of the electric pressure regulating valve under the current operating conditions, including: obtaining the current operating condition parameters, the operating condition parameters include environmental parameters and engine operating parameters; based on a pre-constructed correspondence between the operating condition parameters and the lower limit value of the driving duty cycle, obtaining the lower limit value of the driving duty cycle corresponding to the current operating condition parameters.

[0136] Optionally, the environmental parameter includes at least one of an environmental pressure and an environmental temperature. Optionally, the operating parameter of the engine includes a rotation speed of the engine and may also include a fuel injection amount of the engine.

[0137] Optional, in Figure 3 Based on the air leakage fault detection device shown, further configuration is provided:

[0138] A second state decision module is used to enter a fault verification state when the operating parameters of the engine indicate that the engine is in a high-load steady-state operating condition;

[0139] A second lower limit value determination module is used to obtain the driving duty cycle of the electric pressure regulating valve in a fault verification state, and determine the lower limit value of the driving duty cycle of the electric pressure regulating valve in a current working condition;

[0140] The fault verification module is used to determine that the leakage fault of the electric pressure regulating valve is caused by the wear of the valve core of the electric pressure regulating valve when the difference between the driving duty cycle of the electric pressure regulating valve and the lower limit value under the current working condition is within the allowable range. The allowable range can be determined through multiple tests.

[0141] In one possible implementation, the second state decision module determines that the engine is in a high-load steady-state condition when the engine operating parameters meet the following conditions: the actual engine speed is greater than the second speed threshold, and the actual engine speed change rate is less than the first change rate threshold.

[0142] In one possible implementation, the second state decision module determines that the engine is in a high-load steady-state operating condition when the engine operating parameters meet the following conditions: the actual engine speed is greater than the second speed threshold, the actual fuel injection amount of the engine is greater than the second fuel injection amount threshold, the actual engine speed change rate is less than the first change rate threshold, and the actual fuel injection amount change rate of the engine is less than the second change rate threshold.

[0143] The present application discloses a method for handling an air leakage fault, and accordingly, the present application also discloses a device for handling an air leakage fault to implement the method for handling an air leakage fault.

[0144] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of a gas leakage fault processing device disclosed in the present application. The gas leakage fault processing device includes:

[0145] An operating parameter acquisition module 10 is used to obtain operating parameters of the engine;

[0146] The first state decision module 20 is used to enter a fault detection state when the operating parameters of the engine indicate that the engine is in a low-load steady state;

[0147] A first lower limit value determination module 30 is used to obtain the driving duty ratio of the electric pressure regulating valve in a fault detection state, and determine the lower limit value of the driving duty ratio of the electric pressure regulating valve in a current working condition, wherein the driving duty ratio of the electric pressure regulating valve is adjusted based on the actual pressure of the intake manifold of the engine and the target pressure, and when the actual pressure of the intake manifold is less than the target pressure, the driving duty ratio of the electric pressure regulating valve is gradually reduced;

[0148] The air leakage fault determination module 40 is used to determine that the electric pressure regulating valve has an air leakage fault when the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working condition and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0;

[0149] The air leakage fault compensation module 50 is used to adjust the opening of the proportional control valve so that the actual pressure of the intake manifold of the engine reaches the target pressure.

[0150] The air leakage fault handling device disclosed in the present application can detect whether an electric pressure regulating valve has an air leakage fault without disassembling the engine; a proportional control valve is arranged on a pipeline connecting the air outlet of the electric pressure regulating valve and the control port of the air release valve, and when it is determined that the electric pressure regulating valve has an air leakage fault, the opening of the proportional control valve is adjusted so as to make the actual pressure of the engine's intake manifold reach the target pressure, thereby solving the problem of poor control effect on the air release valve caused by the air leakage fault of the electric pressure regulating valve.

[0151] Optional, in Figure 4 On the basis of the air leakage fault processing device shown in the figure, it is further provided with:

[0152] A second state decision module is used to enter a fault verification state when the operating parameters of the engine indicate that the engine is in a high-load steady-state operating condition;

[0153] A second lower limit value determination module is used to obtain the driving duty cycle of the electric pressure regulating valve in a fault verification state, and determine the lower limit value of the driving duty cycle of the electric pressure regulating valve in a current working condition;

[0154] The fault verification module is used to determine that the leakage fault of the electric pressure regulating valve is caused by the wear of the valve core of the electric pressure regulating valve when the difference between the driving duty cycle of the electric pressure regulating valve and the lower limit value under the current working condition is within the allowable range. The allowable range can be determined through multiple tests.

[0155] The present application also provides an electronic device.

[0156] See also Figure 5 , Figure 5 The hardware structure of the electronic device is shown. The electronic device includes: a processor 501 , a memory 502 , a communication interface 503 , and a communication bus 504 .

[0157] In the embodiment of the present application, the number of the processor 501, the memory 502, the communication interface 503, and the communication bus 504 is at least one, and the processor 501, the memory 502, and the communication interface 503 communicate with each other through the communication bus 504. The communication bus 504 can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc.

[0158] It should be noted that those skilled in the art can understand that Figure 5 The structure of the electronic device shown in the figure does not constitute a limitation on the electronic device, and the electronic device may include Figure 5 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0159] Combine the following Figure 5 Provide a detailed introduction to the various components of electronic equipment.

[0160] The processor 501 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. It executes various functions of the electronic device and processes data by running or executing software programs and / or modules stored in the memory 502 and calling data stored in the memory 502, thereby monitoring the electronic device as a whole.

[0161] The processor 501 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention, etc.;

[0162] The memory 502 may include a memory, such as a high-speed random-access memory (RAM) and a read-only memory (ROM), and may also include a large-capacity storage device, such as at least one disk storage.

[0163] Among them, the memory 502 stores a program, and the processor 501 can call the program stored in the memory 502, and the program is used to implement any one of the leakage fault detection methods provided in the embodiments of the present application, or implement any one of the leakage fault processing methods provided in the embodiments of the present application.

[0164] An embodiment of the present application also provides a computer storage medium, which carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any one of the air leakage fault detection methods provided in the embodiment of the present application, or implement any one of the air leakage fault handling methods provided in the embodiment of the present application.

[0165] An embodiment of the present application also provides a computer program product, including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements any one of the air leakage fault detection methods provided in the embodiments of the present application, or implements any one of the air leakage fault processing methods provided in the embodiments of the present application.

[0166] It should be noted that the technical features recorded in the various embodiments in the specification can be replaced or combined with each other, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. The steps in the methods of the various embodiments of the present application can be adjusted in sequence, merged and deleted according to actual needs. The modules and sub-modules in the devices and equipment of the various embodiments of the present application can be merged, divided and deleted according to actual needs.

[0167] In the several embodiments provided in the present application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic, for example, the division of modules or sub-modules is only a logical function division, and there may be other division methods in actual implementation, for example, multiple sub-modules or modules can be combined or integrated into another module, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0168] The modules or submodules described as separate components may or may not be physically separated, and the components of the modules or submodules may or may not be physical modules or submodules, that is, they may be located in one place, or they may be distributed on multiple network modules or submodules. Some or all of the modules or submodules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0169] In addition, each functional module or submodule in each embodiment of the present application may be integrated into one processing module, or each module or submodule may exist physically separately, or two or more modules or submodules may be integrated into one module. The above-mentioned integrated modules or submodules may be implemented in the form of hardware or in the form of software functional modules or submodules.

[0170] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article 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 process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0171] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. The various technical features in the various embodiments can be arranged and combined to form new embodiments. For the air leakage fault detection device, air leakage fault processing device, electronic device, computer storage medium and computer program product disclosed in the embodiments, since they correspond to the air leakage fault detection method and air leakage fault processing method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0172] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for detecting air leakage faults, wherein the air inlet of an electric pressure regulating valve is connected to an air source, and the air outlet of the electric pressure regulating valve is connected to a control port of an air release valve of a turbocharger, It is characterized in that The air leakage fault detection method comprises: Obtaining engine operating parameters; Entering a fault detection state when the operating parameters of the engine indicate that the engine is in a low-load steady-state operating condition; In the fault detection state, the driving duty ratio of the electric pressure regulating valve is obtained, and the lower limit value of the driving duty ratio of the electric pressure regulating valve under the current working condition is determined, wherein the driving duty ratio of the electric pressure regulating valve is adjusted based on the actual pressure of the intake manifold of the engine and the target pressure, and when the actual pressure of the intake manifold is less than the target pressure, the driving duty ratio of the electric pressure regulating valve is gradually reduced; If the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working condition, and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0, it is determined that the electric pressure regulating valve has an air leakage fault.

2. The air leakage fault detection method according to claim 1, It is characterized in that When the operating parameters of the engine meet the following conditions, it is determined that the engine is in a low-load steady-state operating condition: The actual speed of the engine is less than a first speed threshold, the actual fuel injection amount of the engine is less than a first fuel injection amount threshold, the actual speed change rate of the engine is less than a first change rate threshold, and the actual fuel injection amount change rate of the engine is less than a second change rate threshold.

3. The air leakage fault detection method according to claim 1, It is characterized in that Determining the lower limit of the driving duty cycle of the electric pressure regulating valve under the current working condition includes: Obtaining current operating parameters, wherein the operating parameters include environmental parameters and operating parameters of the engine; Based on the pre-established correspondence between the operating condition parameter and the lower limit value of the driving duty cycle, the lower limit value of the driving duty cycle corresponding to the current operating condition parameter is obtained.

4. The air leakage fault detection method according to claim 1, It is characterized in that After determining that the electric pressure regulating valve has a gas leakage fault, the method further includes: Entering a fault verification state when the operating parameters of the engine indicate that the engine is in a high-load steady-state operating condition; In the fault verification state, obtaining a driving duty cycle of the electric pressure regulating valve, and determining a lower limit value of the driving duty cycle of the electric pressure regulating valve under a current working condition; If the difference between the driving duty cycle of the electric pressure regulating valve and the lower limit value under the current working condition is within the allowable range, it is determined that the air leakage fault of the electric pressure regulating valve is caused by the wear of the valve core of the electric pressure regulating valve.

5. The air leakage fault detection method according to claim 4, It is characterized in that When the operating parameters of the engine meet the following conditions, it is determined that the engine is in a high-load steady-state operating condition: The actual speed of the engine is greater than the second speed threshold, the actual fuel injection amount of the engine is greater than the second fuel injection amount threshold, the actual speed change rate of the engine is less than the first change rate threshold, and the actual fuel injection amount change rate of the engine is less than the second change rate threshold.

6. A gas leakage fault detection device, wherein the air inlet of the electric pressure regulating valve is connected to the air source, and the air outlet of the electric pressure regulating valve is connected to the control port of the exhaust valve of the turbocharger, It is characterized in that The air leakage fault detection device comprises: An operating parameter acquisition module is used to obtain the operating parameters of the engine; A first state decision module, configured to enter a fault detection state when the operating parameters of the engine indicate that the engine is in a low-load steady-state operating condition; a first lower limit value determination module, configured to obtain the driving duty ratio of the electric pressure regulating valve in the fault detection state, and determine the lower limit value of the driving duty ratio of the electric pressure regulating valve in the current working condition, wherein the driving duty ratio of the electric pressure regulating valve is adjusted based on the actual pressure of the intake manifold of the engine and the target pressure, and when the actual pressure of the intake manifold is less than the target pressure, the driving duty ratio of the electric pressure regulating valve is gradually reduced; The air leakage fault determination module is used to determine that the electric pressure regulating valve has an air leakage fault when the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working conditions and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0.

7. A method for handling air leakage faults, wherein the air inlet of the electric pressure regulating valve is connected to the air source, and the air outlet of the electric pressure regulating valve is connected to the control port of the exhaust valve of the turbocharger. It is characterized in that A proportional regulating valve is arranged on a pipeline connecting the gas outlet of the electric pressure regulating valve and the control port of the air release valve, and the gas leakage fault handling method includes: Obtaining engine operating parameters; Entering a fault detection state when the operating parameters of the engine indicate that the engine is in a low-load steady-state operating condition; In the fault detection state, the driving duty ratio of the electric pressure regulating valve is obtained, and the lower limit value of the driving duty ratio of the electric pressure regulating valve under the current working condition is determined, wherein the driving duty ratio of the electric pressure regulating valve is adjusted based on the actual pressure of the intake manifold of the engine and the target pressure, and when the actual pressure of the intake manifold is less than the target pressure, the driving duty ratio of the electric pressure regulating valve is gradually reduced; If the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working condition, and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0, it is determined that the electric pressure regulating valve has an air leakage fault; The opening of the proportional control valve is adjusted with the goal of making the actual pressure of the intake manifold of the engine reach the target pressure.

8. A gas leakage fault processing device, wherein the air inlet of the electric pressure regulating valve is connected to the air source, and the air outlet of the electric pressure regulating valve is connected to the control port of the exhaust valve of the turbocharger, It is characterized in that A proportional regulating valve is arranged on a pipeline connecting the gas outlet of the electric pressure regulating valve and the control port of the air release valve, and the gas leakage fault processing device comprises: An operating parameter acquisition module is used to obtain the operating parameters of the engine; A first state decision module, configured to enter a fault detection state when the operating parameters of the engine indicate that the engine is in a low-load steady-state operating condition; a first lower limit value determination module, configured to obtain the driving duty ratio of the electric pressure regulating valve in the fault detection state, and determine the lower limit value of the driving duty ratio of the electric pressure regulating valve in the current working condition, wherein the driving duty ratio of the electric pressure regulating valve is adjusted based on the actual pressure of the intake manifold of the engine and the target pressure, and when the actual pressure of the intake manifold is less than the target pressure, the driving duty ratio of the electric pressure regulating valve is gradually reduced; A gas leakage fault determination module, configured to determine that the electric pressure regulating valve has a gas leakage fault when the driving duty cycle of the electric pressure regulating valve is less than the lower limit value under the current working condition and the absolute value of the difference between the two is greater than a preset value or the driving duty cycle of the electric pressure regulating valve is 0; The air leakage fault compensation module is used to adjust the opening of the proportional control valve with the goal of making the actual pressure of the intake manifold of the engine reach the target pressure.

9. An electronic device, It is characterized in that The method comprises at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program so that the electronic device can implement the air leakage fault detection method as described in any one of claims 1 to 5, or implement the air leakage fault processing method as described in claim 7.

10. A computer storage medium, It is characterized in that The computer storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement the air leakage fault detection method as described in any one of claims 1 to 5, or implement the air leakage fault processing method as described in claim 7.

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