Supercharger fault diagnosis method and device, equipment, storage medium and product

Abstract

The invention discloses a supercharger fault diagnosis method and device, equipment, a storage medium and a product, and relates to the technical field of vehicle detection, and the method comprises the steps: determining a first voltage range of a target supercharger according to a voltage characteristic curve of the target supercharger; determining a second voltage range of the target supercharger based on the nozzle ring gas amount of the target supercharger; when it is detected that the vehicle engine is started, the actuator voltage of the target supercharger at the current moment is obtained; and performing fault diagnosis on the target supercharger based on the first voltage range, the second voltage range and the actuator voltage. The voltage range of the target supercharger is determined according to the voltage characteristic curve of the target supercharger and the nozzle ring gas amount, and then fault diagnosis can be carried out on the target supercharger based on the voltage range and the voltage of the target supercharger at the current moment. Therefore, the phenomenon that the performance of the engine is reduced due to the fact that the fault supercharger is used when the vehicle runs is avoided.

Description

Technical Field

[0001] The present application relates to the field of vehicle detection technology, and in particular to a supercharger fault diagnosis method, device, equipment, storage medium and product. Background Art

[0002] As an intelligent supercharging system, VGT (Variable Geometry Turbocharger) can adjust the working voltage of the nozzle ring according to demand, thereby adjusting the opening of the nozzle ring. As the angle of the nozzle ring blade changes, the minimum flow cross-sectional area of ​​the turbine and the angle and speed of the exhaust gas entering the turbine will change, thereby changing the turbine speed and the boost pressure at the compressor outlet. Since the supercharger affects the engine performance, how to diagnose the fault of the supercharger to determine whether the supercharger is working properly has become an important research direction for technicians in the industry.

[0003] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The main purpose of the present application is to provide a supercharger fault diagnosis method, device, equipment, storage medium and product, aiming to solve the technical problem of how to diagnose a supercharger fault to determine whether the supercharger is working normally.

[0005] To achieve the above object, the present application provides a supercharger fault diagnosis method, the method comprising the following steps:

[0006] Determining a first voltage range of the target supercharger according to a voltage characteristic curve of the target supercharger, wherein the first voltage range includes a mechanical top dead center voltage and a mechanical bottom dead center voltage;

[0007] Determining a second voltage range of the target supercharger based on the nozzle annular gas volume of the target supercharger, wherein the second voltage range includes a first calibrated voltage and a second calibrated voltage;

[0008] When it is detected that the vehicle engine is started, obtaining the actuator voltage of the target supercharger at the current moment;

[0009] Fault diagnosis is performed on the target supercharger based on the first voltage range, the second voltage range, and the actuator voltage.

[0010] In one embodiment, the step of determining the second voltage range of the target supercharger based on the nozzle annular gas volume of the target supercharger includes:

[0011] Sending a preset electrical signal to the target supercharger to adjust the nozzle ring opening of the target supercharger to a position where the nozzle ring gas volume is minimum and a position where the nozzle ring gas volume is maximum;

[0012] The first calibration voltage and the second calibration voltage of the target supercharger are determined based on the voltages corresponding to the nozzle annular air volume maximum position and the nozzle annular air volume minimum position respectively.

[0013] In one embodiment, the step of performing fault diagnosis on the target supercharger based on the first voltage range, the second voltage range and the actuator voltage includes:

[0014] If the actuator voltage is greater than or equal to the mechanical top dead center voltage and less than or equal to the second calibration voltage, it is determined that the voltage of the target supercharger is too low;

[0015] A fault diagnosis is performed on the target supercharger according to a first actual supercharging pressure and a first required supercharging pressure corresponding to the target supercharger at a current moment.

[0016] In one embodiment, the step of performing fault diagnosis on the target supercharger according to the first actual supercharging pressure and the first required supercharging pressure corresponding to the target supercharger at the current moment comprises:

[0017] Calculating a first difference between a first actual boost pressure and a first required boost pressure corresponding to the target supercharger at a current moment;

[0018] If the first difference is greater than or equal to a first preset threshold, it is determined that the target supercharger has a pipeline leakage fault or an abnormal combustion fault.

[0019] In one embodiment, the step of performing fault diagnosis on the target supercharger based on the first voltage range, the second voltage range and the actuator voltage further includes:

[0020] If the actuator voltage is greater than or equal to the first calibration voltage and less than or equal to the mechanical bottom dead center voltage, it is determined that the voltage of the target supercharger is too high;

[0021] A fault diagnosis is performed on the target supercharger according to a second actual supercharging pressure and a second required supercharging pressure corresponding to the target supercharger at the current moment.

[0022] In one embodiment, the step of performing fault diagnosis on the target supercharger according to the second actual supercharging pressure and the second required supercharging pressure corresponding to the target supercharger at the current moment comprises:

[0023] Calculating a second difference between a second actual boost pressure and a second required boost pressure corresponding to the target supercharger at the current moment;

[0024] If the second difference is greater than or equal to a second preset threshold, it is determined that the target supercharger has an abnormal wear fault of the transmission mechanism.

[0025] In addition, to achieve the above-mentioned purpose, the present application also proposes a supercharger fault diagnosis device, the supercharger fault diagnosis device comprising:

[0026] A first range determination module, configured to determine a first voltage range of the target supercharger according to a voltage characteristic curve of the target supercharger, wherein the first voltage range includes a mechanical top dead center voltage and a mechanical bottom dead center voltage;

[0027] A second range determination module, configured to determine a second voltage range of the target supercharger based on the nozzle annular gas volume of the target supercharger, wherein the second voltage range includes a first calibrated voltage and a second calibrated voltage;

[0028] A voltage acquisition module, used for acquiring the actuator voltage of the target supercharger at the current moment when it is detected that the vehicle engine is started;

[0029] A fault diagnosis module is used to perform fault diagnosis on the target supercharger based on the first voltage range, the second voltage range and the actuator voltage.

[0030] In addition, to achieve the above-mentioned purpose, the present application also proposes a supercharger fault diagnosis device, which includes: a memory, a processor, and a supercharger fault diagnosis program stored in the memory and executable on the processor, wherein the supercharger fault diagnosis program is configured to implement the steps of the supercharger fault diagnosis method described above.

[0031] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and stores a supercharger fault diagnosis program. When the supercharger fault diagnosis program is executed by a processor, the steps of the supercharger fault diagnosis method described above are implemented.

[0032] In addition, to achieve the above-mentioned object, the present invention further provides a computer program product, which includes a supercharger fault diagnosis program, and when the supercharger fault diagnosis program is executed by a processor, the steps of the supercharger fault diagnosis method described above are implemented.

[0033] The present application determines the first voltage range of the target supercharger according to the voltage characteristic curve of the target supercharger, the first voltage range includes the mechanical top dead point voltage and the mechanical bottom dead point voltage; determines the second voltage range of the target supercharger based on the nozzle annular gas volume of the target supercharger, the second voltage range includes the first calibrated voltage and the second calibrated voltage; when the vehicle engine is detected to be started, the actuator voltage of the target supercharger at the current moment is obtained; and the target supercharger is fault diagnosed based on the first voltage range, the second voltage range and the actuator voltage. The above method of the present application determines the voltage range of the target supercharger according to the voltage characteristic curve and the nozzle annular gas volume of the target supercharger, and then the target supercharger can be fault diagnosed based on the voltage range and the voltage of the target supercharger at the current moment, thereby avoiding the occurrence of engine performance degradation due to the use of a faulty supercharger when the vehicle is driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the structure of a supercharger fault diagnosis device in a hardware operating environment involved in an embodiment of the present application;

[0035] Figure 2 This is a flow chart of a first embodiment of a supercharger fault diagnosis method of the present application;

[0036] Figure 3 A schematic diagram of a voltage characteristic curve of a supercharger fault diagnosis method of the present application;

[0037] Figure 4 A schematic diagram of a supercharger working area of ​​the supercharger fault diagnosis method of the present application;

[0038] Figure 5 This is a flow chart of a second embodiment of the supercharger fault diagnosis method of the present application;

[0039] Figure 6 This is a flow chart of a third embodiment of the supercharger fault diagnosis method of the present application;

[0040] Figure 7 This is a structural block diagram of the first embodiment of the supercharger fault diagnosis device of the present application.

[0041] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0043] Reference Figure 1 , Figure 1This is a schematic diagram of the structure of a supercharger fault diagnosis device in the hardware operating environment involved in the embodiment of the present application.

[0044] like Figure 1 As shown, the supercharger fault diagnosis device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (Wireless-Fidelity, Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM), or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk storage. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0045] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the supercharger fault diagnosis device, and may include more or less components than those shown in the figure, or combine certain components, or arrange the components differently.

[0046] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a supercharger fault diagnosis program.

[0047] exist Figure 1 In the supercharger fault diagnosis device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the supercharger fault diagnosis device of the present application can be set in the supercharger fault diagnosis device, and the supercharger fault diagnosis device calls the supercharger fault diagnosis program stored in the memory 1005 through the processor 1001, and executes the supercharger fault diagnosis method provided in the embodiment of the present application.

[0048] The present application embodiment provides a supercharger fault diagnosis method, referring to Figure 2 , Figure 2 This is a flow chart of the first embodiment of the supercharger fault diagnosis method of the present application.

[0049] In this embodiment, the supercharger fault diagnosis method includes the following steps:

[0050] Step S10: determining a first voltage range of the target supercharger according to a voltage characteristic curve of the target supercharger, wherein the first voltage range includes a mechanical top dead center voltage and a mechanical bottom dead center voltage.

[0051] It should be noted that the execution subject of the method of this embodiment can be a terminal device with data acquisition, data processing and program running functions, such as a smart phone, a computer, etc., or an electronic device with the same or similar functions, such as the above-mentioned supercharger fault diagnosis device. The following takes the supercharger fault diagnosis device (hereinafter referred to as the diagnosis device) as an example to illustrate this embodiment and the following embodiments.

[0052] It is understandable that the above-mentioned target supercharger can be a variable geometry turbocharger (VGT). VGT is based on variable geometry turbine technology, and its main component is a variable geometry turbine. The turbine consists of a plurality of adjustable nozzle ring blades, which can control the flow rate and flow of the airflow according to changes in engine load and speed. Specifically, VGT can achieve the required boost pressure by controlling the angle of the nozzle ring blades. The blades of the nozzle ring can rotate together around their respective axes. As the angle of the nozzle ring blades changes, the minimum flow cross-sectional area of ​​the turbine and the angle and speed at which the exhaust enters the turbine will change, thereby changing the speed of the turbine and the boost pressure at the outlet of the compressor. In addition, according to the power and torque requirements during engine development, the relevant parameters of the supercharger (such as speed, torque, power, intake volume, exhaust volume, etc.) will be given. VGT actually controls the opening of the nozzle ring blades through electrical signals, thereby controlling the gas volume to achieve the required power and torque. Therefore, it can be understood that VGT achieves the required power and torque through electrical signal control.

[0053] It should be understood that the above voltage characteristic curve is the characteristic parameter of the target supercharger, which can be found in the product document of the target supercharger. Figure 3 , Figure 3 This is a schematic diagram of the voltage characteristic curve of the supercharger fault diagnosis method of the present application, which shows the operating range of the supercharger actuator voltage during the operation of the supercharger (i.e., the first voltage range mentioned above), i.e., the mechanical lower dead point is 4.75±0.11V and the mechanical upper dead point is 0.25±0.11V.

[0054] Step S20: determining a second voltage range of the target supercharger based on the nozzle annular gas volume of the target supercharger, wherein the second voltage range includes a first calibrated voltage and a second calibrated voltage.

[0055] It should be noted that the above-mentioned nozzle annular air volume refers to the gas flow rate of the nozzle intake in the above-mentioned target supercharger, which is used to control the working state of the turbocharger. In the turbocharger system, the adjustment of the nozzle annular air volume can affect the pressure and speed of the supercharger, and then affect the output power and efficiency of the engine. The nozzle annular air volume is usually controlled by the opening time of the nozzle and the working cycle of the nozzle. When the supercharger needs to increase the pressure and output power, increasing the nozzle annular air volume can increase the speed and pressure of the supercharger; conversely, reducing the nozzle annular air volume can reduce the speed and pressure of the supercharger to adapt to different working conditions and performance requirements. By precisely controlling the nozzle annular air volume, the engine management system can adjust the working state of the supercharger to provide appropriate boosting effect under different working conditions, thereby improving the engine's power performance, combustion efficiency and emission performance.

[0056] Step S30: when it is detected that the vehicle engine is started, the actuator voltage of the target supercharger at the current moment is obtained.

[0057] It should be understood that the above-mentioned actuator voltage refers to the voltage used to control the operation of the supercharger actuator (usually the actuator of the turbocharger). The supercharger actuator controls the switching state and operating conditions of the supercharger through changes in voltage, thereby adjusting the working efficiency and output of the supercharger. Normally, the voltage of the supercharger actuator is adjusted according to the settings of the engine management system or the vehicle control system to meet the output requirements under specific working conditions. By changing the voltage of the actuator, the speed, pressure and boost effect of the supercharger can be controlled, thereby affecting the performance of the engine. The specific actuator voltage depends on the design and requirements of the supercharger actuator. Usually in the electrical system of the vehicle, the actuator voltage will be dynamically adjusted according to the instructions and feedback signals of the vehicle control system to ensure the performance and efficiency of the engine under different working conditions.

[0058] In a specific implementation, the actuator voltage of the target supercharger at the current moment may be obtained through the ECU (Electronic Control Unit) of the vehicle.

[0059] Step S40: performing fault diagnosis on the target supercharger based on the first voltage range, the second voltage range and the actuator voltage.

[0060] In a specific implementation, fault diagnosis of the target supercharger may be performed based on the numerical relationship between the actuator voltage and the first voltage range and the second voltage range.

[0061] In a feasible implementation manner, the step S20 may include:

[0062] Step S201: sending a preset electrical signal to the target supercharger to adjust the nozzle ring opening of the target supercharger to a position where the nozzle ring gas volume is minimum and a position where the nozzle ring gas volume is maximum.

[0063] Step S202: determining a first calibration voltage and a second calibration voltage of the target supercharger based on voltages corresponding to the nozzle annular air volume maximum position and the nozzle annular air volume minimum position, respectively.

[0064] It should be understood that the smaller the voltage of the target supercharger is, the larger the nozzle ring vanes are opened, and the corresponding intake air volume is larger.

[0065] In actual implementation, the nozzle ring opening also has the maximum and minimum flow positions, which correspond to two dead points. By analogy, during normal use, the dead point range of the nozzle ring needs to be larger than the voltage range during normal engine operation, otherwise the supercharger capacity will be insufficient, resulting in insufficient engine power. Therefore, during normal engine operation, the actual working range of the supercharger can be referred to Figure 4 , Figure 4 This is a schematic diagram of the supercharger working area of ​​the supercharger fault diagnosis method of this application. Figure 4 , the nozzle ring bottom dead point A is the position with the minimum air volume of the nozzle ring, B is the position with the maximum air volume of the nozzle ring, the calibrated bottom dead point C is the position with the minimum required air intake volume, and D is the position with the maximum required air intake volume.

[0066] This embodiment determines the first voltage range of the target supercharger according to the voltage characteristic curve of the target supercharger, and the first voltage range includes the mechanical top dead point voltage and the mechanical bottom dead point voltage; sends a preset electrical signal to the target supercharger to make the nozzle ring opening of the target supercharger to the minimum nozzle ring gas volume position and the maximum nozzle ring gas volume position; determines the first calibration voltage and the second calibration voltage of the target supercharger based on the voltages corresponding to the maximum nozzle ring gas volume position and the minimum nozzle ring gas volume position respectively; when the vehicle engine is detected to be started, the actuator voltage of the target supercharger at the current moment is obtained; and the target supercharger is fault diagnosed based on the first voltage range, the second voltage range and the actuator voltage. The above method of this embodiment determines the voltage range of the target supercharger according to the voltage characteristic curve and the nozzle ring gas volume of the target supercharger, and then the target supercharger can be fault diagnosed based on the voltage range and the voltage of the target supercharger at the current moment, thereby avoiding the occurrence of engine performance degradation due to the use of a faulty supercharger when the vehicle is driving.

[0067] refer to Figure 5 , Figure 5 This is a flow chart of a second embodiment of a supercharger fault diagnosis method of the present application.

[0068] In a feasible implementation manner, the step S40 may include:

[0069] Step S401: If the actuator voltage is greater than or equal to the mechanical top dead center voltage and less than or equal to the second calibration voltage, it is determined that the voltage of the target supercharger is too low.

[0070] Step S402: performing fault diagnosis on the target supercharger according to a first actual supercharging pressure and a first required supercharging pressure corresponding to the target supercharger at the current moment.

[0071] In the specific implementation, Figure 4 The voltages corresponding to the six points A, B, C, D, the mechanical top dead center and the mechanical bottom dead center are set as UA, UB, UC, UD, UE and UF respectively. In this embodiment, the fault diagnosis of the above-mentioned target supercharger can be performed based on these six points and their corresponding voltages.

[0072] In a feasible implementation manner, the step S402 may include:

[0073] Step S4021: Calculate a first difference between a first actual boost pressure and a first required boost pressure corresponding to the target supercharger at the current moment.

[0074] Step S4022: If the first difference is greater than or equal to a first preset threshold, it is determined that the target supercharger has a pipeline leakage fault or an abnormal combustion fault.

[0075] In the specific implementation, when the actuator voltage U∈[UE, UD] of the target supercharger is too low, it means that the voltage of the target supercharger is too low. At this time, the boost pressure is in the abnormal working range, and the specific cause needs to be investigated. For the target supercharger, the smaller the voltage, the greater the boost pressure of the target supercharger. First, confirm whether the actual boost pressure P0 (i.e. the above-mentioned first actual boost pressure) and the required boost pressure P1 (i.e. the above-mentioned first required boost pressure) corresponding to the target supercharger at the current moment can follow, and confirm the first difference ΔP=P0-P1 between the actual boost pressure and the required boost pressure (the actual boost pressure is too high at this time, so ΔP>0). Assuming that the above-mentioned first preset threshold is 25KPa, when ΔP<25KPa, it can be determined that the actual boost pressure follows the required boost pressure. At this time, it is necessary to confirm that the voltage value settings of the calibration points C and D are consistent with each other. Figure 4 Whether it matches; when ΔP≥25KPa, the actual boost pressure is too large. Generally speaking, this situation will occur when there is a leak in the pipeline or abnormal combustion. You can focus on checking the pipeline and combustion parameters of the target supercharger.

[0076] This embodiment determines that the voltage of the target supercharger is too low if the actuator voltage is greater than or equal to the mechanical top dead center voltage and less than or equal to the second calibrated voltage; calculates the first difference between the first actual boost pressure and the first required boost pressure corresponding to the target supercharger at the current moment; and determines that the target supercharger has a pipeline leakage fault or a combustion abnormality fault if the first difference is greater than or equal to the first preset threshold. The above method of this embodiment can accurately detect whether there is a pipeline leakage fault or a combustion abnormality fault in the target supercharger according to the first actual boost pressure and the first required boost pressure corresponding to the target supercharger at the current moment, when it has been determined that the actuator voltage of the target supercharger is too low.

[0077] refer to Figure 6 , Figure 6 This is a flow chart of a third embodiment of a supercharger fault diagnosis method of the present application.

[0078] In a feasible implementation manner, the step S40 may further include:

[0079] Step S403: If the actuator voltage is greater than or equal to the first calibration voltage and less than or equal to the mechanical bottom dead center voltage, it is determined that the voltage of the target supercharger is too high.

[0080] Step S404: performing fault diagnosis on the target supercharger according to the second actual supercharging pressure and the second required supercharging pressure corresponding to the target supercharger at the current moment.

[0081] In the specific implementation, Figure 4 The voltages corresponding to the six points A, B, C, D, the mechanical top dead center and the mechanical bottom dead center are set as UA, UB, UC, UD, UE and UF respectively. In this embodiment, the fault diagnosis of the target supercharger can also be performed based on these six points and their corresponding voltages.

[0082] In a feasible implementation manner, the step S404 may include:

[0083] Step S4041: Calculate a second difference between a second actual boost pressure and a second required boost pressure corresponding to the target supercharger at the current moment.

[0084] Step S4042: If the second difference is greater than or equal to a second preset threshold, it is determined that the target supercharger has an abnormal wear fault in the transmission mechanism.

[0085] In a specific implementation, when the actuator voltage U∈[UC, UF] of the target supercharger is too high, it means that the voltage of the target supercharger is too high, and at this time the actual boost pressure is smaller than the required boost pressure. Similarly, first confirm whether the actual boost pressure P2 (i.e. the above-mentioned second actual boost pressure) and the required boost pressure P3 (i.e. the above-mentioned second required boost pressure) can follow, and confirm the second difference ΔP=|P0-P1| between the actual boost pressure and the required boost pressure (at this time the actual boost pressure is too low, so ΔP takes an absolute value). Assuming that the above-mentioned second preset threshold is 25KPa, when ΔP<25KPa, it can be determined that the actual boost pressure follows the required boost pressure. At this time, it is necessary to confirm that the voltage value settings of the calibration points B and D are consistent with each other. Figure 4 Whether it matches; when ΔP≥25KPa, the actual boost pressure is too small. Generally speaking, abnormal wear of the supercharger transmission mechanism (wear voltage will be too large) will cause this phenomenon, so the supercharger can be checked in particular.

[0086] In this embodiment, if the actuator voltage is greater than or equal to the first calibration voltage and less than or equal to the mechanical bottom dead center voltage, it is determined that the voltage of the target supercharger is too high; the second difference between the second actual boost pressure and the second required boost pressure corresponding to the target supercharger at the current moment is calculated; if the second difference is greater than or equal to the second preset threshold, it is determined that the target supercharger has an abnormal wear fault in the transmission mechanism. In the above method of this embodiment, when it is determined that the actuator voltage of the target supercharger is too high, it can accurately detect whether there is an abnormal wear fault in the transmission mechanism of the target supercharger according to the second actual boost pressure and the second required boost pressure corresponding to the target supercharger at the current moment.

[0087] In addition, an embodiment of the present application further provides a storage medium, on which a supercharger fault diagnosis program is stored. When the supercharger fault diagnosis program is executed by a processor, the steps of the supercharger fault diagnosis method described above are implemented.

[0088] Reference Figure 7 , Figure 7 This is a structural block diagram of the first embodiment of the supercharger fault diagnosis device of the present application.

[0089] like Figure 7 As shown, the supercharger fault diagnosis device proposed in the embodiment of the present application includes:

[0090] A first range determination module 701, configured to determine a first voltage range of a target supercharger according to a voltage characteristic curve of the target supercharger, wherein the first voltage range includes a mechanical top dead center voltage and a mechanical bottom dead center voltage;

[0091] A second range determination module 702, configured to determine a second voltage range of the target supercharger based on the nozzle annular gas volume of the target supercharger, wherein the second voltage range includes a first calibrated voltage and a second calibrated voltage;

[0092] The voltage acquisition module 703 is used to acquire the actuator voltage of the target supercharger at the current moment when the vehicle engine is detected to be started;

[0093] The fault diagnosis module 704 is configured to perform fault diagnosis on the target supercharger based on the first voltage range, the second voltage range, and the actuator voltage.

[0094] This embodiment determines the first voltage range of the target supercharger according to the voltage characteristic curve of the target supercharger, and the first voltage range includes the mechanical top dead point voltage and the mechanical bottom dead point voltage; determines the second voltage range of the target supercharger based on the nozzle annular gas volume of the target supercharger, and the second voltage range includes the first calibrated voltage and the second calibrated voltage; when the vehicle engine is detected to be started, the actuator voltage of the target supercharger at the current moment is obtained; and the target supercharger is fault diagnosed based on the first voltage range, the second voltage range and the actuator voltage. The above method of this embodiment determines the voltage range of the target supercharger according to the voltage characteristic curve and the nozzle annular gas volume of the target supercharger, and then the target supercharger can be fault diagnosed based on the voltage range and the voltage of the target supercharger at the current moment, thereby avoiding the occurrence of engine performance degradation due to the use of a faulty supercharger when the vehicle is driving.

[0095] Based on the first embodiment of the supercharger fault diagnosis device of the present application, a second embodiment of the supercharger fault diagnosis device of the present application is proposed.

[0096] In this embodiment, the second range determination module 702 is further used to send a preset electrical signal to the target supercharger to make the nozzle ring opening of the target supercharger to the minimum nozzle ring air volume position and the maximum nozzle ring air volume position; based on the voltages corresponding to the maximum nozzle ring air volume position and the minimum nozzle ring air volume position respectively, determine the first calibration voltage and the second calibration voltage of the target supercharger.

[0097] Furthermore, the fault diagnosis module 704 is further configured to determine that the voltage of the target supercharger is too low if the actuator voltage is greater than or equal to the mechanical top dead center voltage and less than or equal to the second calibrated voltage; and perform fault diagnosis on the target supercharger according to the first actual boost pressure and the first required boost pressure corresponding to the target supercharger at the current moment.

[0098] Furthermore, the fault diagnosis module 704 is also used to calculate a first difference between a first actual boost pressure and a first required boost pressure corresponding to the target supercharger at the current moment; if the first difference is greater than or equal to a first preset threshold, it is determined that the target supercharger has a pipeline leakage fault or an abnormal combustion fault.

[0099] Furthermore, the fault diagnosis module 704 is also used to determine that the voltage of the target supercharger is too high if the actuator voltage is greater than or equal to the first calibration voltage and less than or equal to the mechanical bottom dead center voltage; and perform fault diagnosis on the target supercharger according to the second actual boost pressure and the second required boost pressure corresponding to the target supercharger at the current moment.

[0100] Furthermore, the fault diagnosis module 704 is further configured to calculate a second difference between a second actual boost pressure and a second required boost pressure corresponding to the target supercharger at a current moment; if the second difference is greater than or equal to a second preset threshold, it is determined that the target supercharger has an abnormal wear fault in the transmission mechanism.

[0101] Other embodiments or specific implementations of the supercharger fault diagnosis device of the present application can refer to the above-mentioned method embodiments, which will not be described in detail here.

[0102] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system 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 system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0103] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0104] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory / random access memory, a disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0105] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A supercharger fault diagnosis method, characterized in that: The method comprises the following steps: Determining a first voltage range of the target supercharger according to a voltage characteristic curve of the target supercharger, wherein the first voltage range includes a mechanical top dead center voltage and a mechanical bottom dead center voltage; Determining a second voltage range of the target supercharger based on the nozzle annular gas volume of the target supercharger, wherein the second voltage range includes a first calibrated voltage and a second calibrated voltage; When it is detected that the vehicle engine is started, obtaining the actuator voltage of the target supercharger at the current moment; Fault diagnosis is performed on the target supercharger based on the first voltage range, the second voltage range, and the actuator voltage.

2. The supercharger fault diagnosis method according to claim 1, characterized in that: The step of determining the second voltage range of the target supercharger based on the nozzle annular gas volume of the target supercharger comprises: Sending a preset electrical signal to the target supercharger to adjust the nozzle ring opening of the target supercharger to a position where the nozzle ring gas volume is minimum and a position where the nozzle ring gas volume is maximum; The first calibration voltage and the second calibration voltage of the target supercharger are determined based on the voltages corresponding to the nozzle annular air volume maximum position and the nozzle annular air volume minimum position respectively.

3. The supercharger fault diagnosis method according to claim 1, characterized in that: The step of performing fault diagnosis on the target supercharger based on the first voltage range, the second voltage range and the actuator voltage includes: If the actuator voltage is greater than or equal to the mechanical top dead center voltage and less than or equal to the second calibration voltage, it is determined that the voltage of the target supercharger is too low; A fault diagnosis is performed on the target supercharger according to a first actual supercharging pressure and a first required supercharging pressure corresponding to the target supercharger at a current moment.

4. The supercharger fault diagnosis method according to claim 3, characterized in that: The step of performing fault diagnosis on the target supercharger according to the first actual supercharging pressure and the first required supercharging pressure corresponding to the target supercharger at the current moment comprises: Calculating a first difference between a first actual boost pressure and a first required boost pressure corresponding to the target supercharger at a current moment; If the first difference is greater than or equal to a first preset threshold, it is determined that the target supercharger has a pipeline leakage fault or an abnormal combustion fault.

5. The supercharger fault diagnosis method according to claim 1, characterized in that: The step of performing fault diagnosis on the target supercharger based on the first voltage range, the second voltage range and the actuator voltage further includes: If the actuator voltage is greater than or equal to the first calibration voltage and less than or equal to the mechanical bottom dead center voltage, it is determined that the voltage of the target supercharger is too high; A fault diagnosis is performed on the target supercharger according to a second actual supercharging pressure and a second required supercharging pressure corresponding to the target supercharger at the current moment.

6. The supercharger fault diagnosis method according to claim 5, characterized in that: The step of performing fault diagnosis on the target supercharger according to the second actual supercharging pressure and the second required supercharging pressure corresponding to the target supercharger at the current moment comprises: Calculating a second difference between a second actual boost pressure and a second required boost pressure corresponding to the target supercharger at the current moment; If the second difference is greater than or equal to a second preset threshold, it is determined that the target supercharger has an abnormal wear fault of the transmission mechanism.

7. A supercharger fault diagnosis device, characterized in that: The supercharger fault diagnosis device comprises: A first range determination module, configured to determine a first voltage range of the target supercharger according to a voltage characteristic curve of the target supercharger, wherein the first voltage range includes a mechanical top dead center voltage and a mechanical bottom dead center voltage; A second range determination module, configured to determine a second voltage range of the target supercharger based on the nozzle annular gas volume of the target supercharger, wherein the second voltage range includes a first calibrated voltage and a second calibrated voltage; A voltage acquisition module, used for acquiring the actuator voltage of the target supercharger at the current moment when it is detected that the vehicle engine is started; A fault diagnosis module is used to perform fault diagnosis on the target supercharger based on the first voltage range, the second voltage range and the actuator voltage.

8. A supercharger fault diagnosis device, characterized in that: The device comprises: a memory, a processor, and a supercharger fault diagnosis program stored in the memory and executable on the processor, wherein the supercharger fault diagnosis program is configured to implement the steps of the supercharger fault diagnosis method according to any one of claims 1 to 6.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, on which a supercharger fault diagnosis program is stored. When the supercharger fault diagnosis program is executed by a processor, the steps of the supercharger fault diagnosis method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product comprises a supercharger fault diagnosis program, and when the supercharger fault diagnosis program is executed by a processor, the steps of the supercharger fault diagnosis method according to any one of claims 1 to 6 are implemented.

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