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

Abstract

This application discloses a method, apparatus, device, storage medium, and product for turbocharger fault diagnosis, relating to the field of vehicle testing technology. The method includes: determining a first voltage range of the target turbocharger based on its voltage characteristic curve; determining a second voltage range of the target turbocharger based on the nozzle circulating gas volume; acquiring the actuator voltage of the target turbocharger at the current moment when the vehicle engine is detected to be starting; and performing fault diagnosis on the target turbocharger based on the first voltage range, the second voltage range, and the actuator voltage. This application determines the voltage range of the target turbocharger based on its voltage characteristic curve and nozzle circulating gas volume, and then performs fault diagnosis on the target turbocharger based on the voltage range and the voltage of the target turbocharger at the current moment, thereby preventing engine performance degradation due to the use of a faulty turbocharger during vehicle operation.

Description

Technical Field

[0001] This application relates to the field of vehicle testing technology, and in particular to a method, apparatus, equipment, storage medium and product for diagnosing turbocharger faults. Background Technology

[0002] A VGT (Variable Geometry Turbocharger), as an intelligent turbocharging system, can adjust the operating voltage of the nozzle rings according to demand, thereby adjusting the nozzle ring opening. As the nozzle ring blade angle changes, the minimum flow cross-sectional area of ​​the turbine, as well as the angle and velocity of exhaust gas entering the turbine, will change, thus altering the turbine speed and the boost pressure at the compressor outlet. Since the turbocharger affects engine performance, how to diagnose turbocharger faults to determine if it is functioning properly has become an important research direction for technicians in the industry.

[0003] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main purpose of this application is to provide a method, apparatus, equipment, storage medium and product for diagnosing turbocharger faults, aiming to solve the technical problem of how to diagnose turbocharger faults to determine whether the turbocharger is working properly.

[0005] To achieve the above objectives, this application provides a turbocharger fault diagnosis method, the method comprising the following steps:

[0006] The first voltage range of the target turbocharger is determined based on the voltage characteristic curve of the target turbocharger. The first voltage range includes the mechanical top dead center voltage and the mechanical bottom dead center voltage.

[0007] The second voltage range of the target turbocharger is determined based on the nozzle circulation volume of the target turbocharger, and the second voltage range includes a first calibration voltage and a second calibration voltage;

[0008] When the vehicle engine is detected to be starting, the actuator voltage of the target supercharger at the current moment is obtained;

[0009] The target booster is diagnosed 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 turbocharger based on the nozzle circulating gas volume of the target turbocharger includes:

[0011] Send a preset electrical signal to the target turbocharger to make the nozzle ring opening of the target turbocharger reach the minimum nozzle annular air volume position and the maximum nozzle annular air volume position;

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

[0013] In one embodiment, the step of diagnosing faults in the target booster 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, then the voltage of the target booster is determined to be too low.

[0015] The target turbocharger is diagnosed for faults based on the first actual boost pressure and the first required boost pressure corresponding to the target turbocharger at the current moment.

[0016] In one embodiment, the step of diagnosing a fault in the target turbocharger based on the first actual boost pressure and the first required boost pressure at the current moment includes:

[0017] Calculate the first difference between the first actual boost pressure and the first required boost pressure of the target booster at the current moment;

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

[0019] In one embodiment, the step of diagnosing faults in the target booster 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 rated voltage and less than or equal to the mechanical bottom dead center voltage, then the voltage of the target booster is determined to be too high.

[0021] The target turbocharger is diagnosed for faults based on the second actual boost pressure and the second required boost pressure corresponding to the target turbocharger at the current moment.

[0022] In one embodiment, the step of diagnosing a fault in the target turbocharger based on the second actual boost pressure and the second required boost pressure corresponding to the target turbocharger at the current moment includes:

[0023] Calculate the second difference between the second actual boost pressure and the second required boost pressure corresponding to the target booster at the current moment;

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

[0025] Furthermore, to achieve the above objectives, this application also proposes a turbocharger fault diagnosis device, which includes:

[0026] The first range determination module is used to determine a first voltage range of the target turbocharger based on the voltage characteristic curve of the target turbocharger. The first voltage range includes the mechanical top dead center voltage and the mechanical bottom dead center voltage.

[0027] The second range determination module is used to determine a second voltage range of the target turbocharger based on the nozzle circulation volume of the target turbocharger, wherein the second voltage range includes a first calibration voltage and a second calibration voltage;

[0028] The voltage acquisition module is used to acquire the actuator voltage of the target supercharger at the current moment when the vehicle engine is detected to be starting.

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

[0030] In addition, to achieve the above objectives, this application also proposes a turbocharger fault diagnosis device, the device comprising: a memory, a processor, and a turbocharger fault diagnosis program stored in the memory and executable on the processor, the turbocharger fault diagnosis program being configured to implement the steps of the turbocharger fault diagnosis method as described above.

[0031] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, storing a turbocharger fault diagnosis program, wherein when the turbocharger fault diagnosis program is executed by a processor, it implements the steps of the turbocharger fault diagnosis method described above.

[0032] In addition, to achieve the above objectives, the present invention also provides a computer program product, the computer program product including a turbocharger fault diagnosis program, which, when executed by a processor, implements the steps of the turbocharger fault diagnosis method as described above.

[0033] This application determines a first voltage range for the target turbocharger based on its voltage characteristic curve, the first voltage range including the mechanical top dead center voltage and the mechanical bottom dead center voltage; it determines a second voltage range for the target turbocharger based on the nozzle circulating gas volume, the second voltage range including a first calibration voltage and a second calibration voltage; when the vehicle engine is detected to be starting, it acquires the actuator voltage of the target turbocharger at the current moment; and it performs fault diagnosis on the target turbocharger based on the first voltage range, the second voltage range, and the actuator voltage. The method described in this application determines the voltage range of the target turbocharger based on its voltage characteristic curve and nozzle circulating gas volume, and then performs fault diagnosis on the target turbocharger based on the voltage range and the voltage of the target turbocharger at the current moment, thereby avoiding engine performance degradation caused by using a faulty turbocharger while the vehicle is in operation. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a turbocharger fault diagnosis device in the hardware operating environment involved in the embodiments of this application;

[0035] Figure 2 This is a flowchart illustrating the first embodiment of the turbocharger fault diagnosis method of this application;

[0036] Figure 3 This is a schematic diagram of the voltage characteristic curve of the turbocharger fault diagnosis method of this application;

[0037] Figure 4 This is a schematic diagram of the turbocharger working area in the turbocharger fault diagnosis method of this application.

[0038] Figure 5 This is a flowchart illustrating the second embodiment of the turbocharger fault diagnosis method of this application;

[0039] Figure 6 This is a flowchart illustrating the third embodiment of the turbocharger fault diagnosis method of this application;

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

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

[0042] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application.

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

[0044] like Figure 1 As shown, the turbocharger 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. The communication bus 1002 is used to establish communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk storage device. Optionally, 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 does not constitute a limitation on the turbocharger fault diagnosis device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

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

[0047] exist Figure 1 In the turbocharger 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 memory 1005 in the turbocharger fault diagnosis device of this application can be set in the turbocharger fault diagnosis device, and the turbocharger fault diagnosis device calls the turbocharger fault diagnosis program stored in the memory 1005 through the processor 1001 and executes the turbocharger fault diagnosis method provided in the embodiment of this application.

[0048] This application provides a turbocharger fault diagnosis method, referring to... Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of the turbocharger fault diagnosis method of this application.

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

[0050] Step S10: Determine the first voltage range of the target turbocharger based on the voltage characteristic curve of the target turbocharger. The first voltage range includes the mechanical top dead center voltage and the mechanical bottom dead center voltage.

[0051] It should be noted that the executing entity of the method in this embodiment can be a terminal device with data acquisition, data processing, and program execution functions, such as a smartphone or computer, or an electronic device with the same or similar functions, such as the aforementioned turbocharger fault diagnosis device. The following description uses the turbocharger fault diagnosis device (hereinafter referred to as the diagnosis device) as an example to illustrate this embodiment and the following embodiments.

[0052] Understandably, the aforementioned target turbocharger could be a variable geometry turbocharger (VGT). VGT is based on variable geometry turbine technology, and its main component is the variable geometry turbine. This turbine consists of multiple adjustable nozzle ring blades, which control the airflow velocity and volume according to changes in engine load and speed. Specifically, VGT achieves the required boost pressure by controlling the angle of the nozzle ring blades. The nozzle ring blades rotate around their respective axes. As the nozzle ring blade angle changes, the turbine's minimum flow cross-sectional area, as well as the angle and velocity of exhaust gas entering the turbine, will change, thereby altering the turbine speed and the boost pressure at the compressor outlet. Furthermore, based on the power and torque requirements during engine development, turbocharger-related parameters (such as engine speed, torque, power, intake volume, and exhaust volume) will be provided. VGT essentially controls the opening of the nozzle ring blades via electrical signals, thereby controlling the airflow 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 voltage characteristic curves described above represent the characteristic parameters of the target turbocharger, which can be found in the target turbocharger's product documentation. Please refer to [the relevant documentation] for details. Figure 3 , Figure 3 This is a schematic diagram of the voltage characteristic curve of the turbocharger fault diagnosis method of this application. The diagram shows the working range of the turbocharger actuator voltage (i.e., the first voltage range mentioned above) during the operation of the turbocharger, namely 4.75±0.11V at the mechanical lower dead center and 0.25±0.11V at the mechanical upper dead center.

[0054] Step S20: Determine the second voltage range of the target turbocharger based on the nozzle circulation volume of the target turbocharger. The second voltage range includes a first calibration voltage and a second calibration voltage.

[0055] It should be noted that the aforementioned nozzle annular gas volume refers to the gas flow rate entering the nozzles of the target turbocharger, used to control the turbocharger's operating state. In a turbocharging system, adjusting the nozzle annular gas volume can affect the turbocharger's pressure and speed, thereby influencing the engine's output power and efficiency. The nozzle annular gas volume is typically controlled by the nozzle's opening time and duty cycle. When the turbocharger needs to increase pressure and output power, increasing the nozzle annular gas volume can increase the turbocharger's speed and pressure; conversely, decreasing the nozzle annular gas volume can reduce the turbocharger's speed and pressure to adapt to different operating conditions and performance requirements. By precisely controlling the nozzle annular gas volume, the engine management system can adjust the turbocharger's operating state to provide appropriate boost under different operating conditions, thereby improving the engine's power performance, combustion efficiency, and emissions performance.

[0056] Step S30: When the vehicle engine is detected to be starting, obtain the actuator voltage of the target supercharger at the current moment.

[0057] It should be understood that the aforementioned actuator voltage refers to the voltage used to control the operation of the turbocharger actuator (usually the turbocharger actuator). The turbocharger actuator controls the turbocharger's on / off state and operating conditions through voltage changes, thereby regulating the turbocharger's efficiency and output. Typically, the turbocharger actuator voltage is adjusted according to the settings of the engine management system or vehicle control system to meet the output requirements under specific operating conditions. By changing the actuator voltage, the turbocharger's speed, pressure, and boost effect can be controlled, thus affecting engine performance. The specific actuator voltage depends on the turbocharger actuator's design and requirements. Typically, in the vehicle's electrical system, the actuator voltage is dynamically adjusted based on commands and feedback signals from the vehicle control system to ensure engine performance and efficiency under different operating conditions.

[0058] In practice, the actuator voltage of the target turbocharger at the current moment can be obtained through the vehicle's ECU (Electronic Control Unit).

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

[0060] In practical implementation, fault diagnosis of the target booster can be performed based on the numerical relationship between the actuator voltage and the first voltage range and the second voltage range.

[0061] In one feasible implementation, step S20 may include:

[0062] Step S201: Send a preset electrical signal to the target turbocharger to make the nozzle ring opening of the target turbocharger reach the minimum nozzle ring air volume position and the maximum nozzle ring air volume position.

[0063] Step S202: Determine the first calibration voltage and the second calibration voltage of the target turbocharger based on the voltages corresponding to the positions of maximum and minimum nozzle air volume.

[0064] It should be understood that the lower the voltage of the aforementioned target turbocharger, the larger the nozzle ring blades open, and the greater the corresponding intake volume.

[0065] In practical implementation, the nozzle ring opening also has positions of maximum and minimum flow, corresponding to two dead points. Similarly, 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 turbocharger's capacity will be insufficient, leading to insufficient engine power. Therefore, the actual operating range of the turbocharger during normal engine operation can be referenced... Figure 4 , Figure 4 This is a schematic diagram of the turbocharger operating area in the turbocharger fault diagnosis method of this application. Figure 4 The nozzle ring bottom dead center 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 center C is the position with the minimum required air volume, and D is the position with the maximum required air volume.

[0066] This embodiment determines a first voltage range for the target turbocharger based on its voltage characteristic curve. This first voltage range includes the mechanical top dead center voltage and the mechanical bottom dead center voltage. A preset electrical signal is sent to the target turbocharger to adjust the nozzle annulus opening to the minimum and maximum nozzle annulus volume positions. A first calibration voltage and a second calibration voltage for the target turbocharger are determined based on the voltages corresponding to the maximum and minimum nozzle annulus volume positions, respectively. When the vehicle engine is detected to be starting, the actuator voltage of the target turbocharger at the current moment is acquired. Fault diagnosis of the target turbocharger is performed based on the first voltage range, the second voltage range, and the actuator voltage. This embodiment determines the voltage range of the target turbocharger based on its voltage characteristic curve and nozzle annulus volume. Then, fault diagnosis of the target turbocharger can be performed based on the voltage range and the voltage of the target turbocharger at the current moment, thereby avoiding engine performance degradation caused by using a faulty turbocharger while the vehicle is in operation.

[0067] refer to Figure 5 , Figure 5 This is a flowchart illustrating the second embodiment of the turbocharger fault diagnosis method of this application.

[0068] In one feasible implementation, 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, then it is determined that the voltage of the target booster is too low.

[0070] Step S402: Perform fault diagnosis on the target turbocharger based on the first actual boost pressure and the first required boost pressure corresponding to the target turbocharger at the current moment.

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

[0072] In one feasible implementation, step S402 may include:

[0073] Step S4021: Calculate the first difference between the first actual boost pressure and the first required boost pressure of the target booster at the current moment.

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

[0075] In practical implementation, when the actuator voltage U∈[UE, UD] of the target booster is low, it indicates that the booster voltage is below normal operating range, requiring investigation into the specific cause. For the target booster, the lower the voltage, the higher the booster pressure. First, confirm whether the actual booster pressure P0 (i.e., the first actual booster pressure mentioned above) and the required booster pressure P1 (i.e., the first required booster pressure mentioned above) of the target booster at the current moment can follow each other, and confirm the first difference between the actual booster pressure and the required booster pressure ΔP = P0 - P1 (at this time, the actual booster pressure is too high, so ΔP > 0). Assuming the first preset threshold is 25 kPa, when ΔP < 25 kPa, it can be determined that the actual booster pressure follows the required booster pressure. At this time, it is necessary to confirm the voltage settings of calibration points C and D. Figure 4 Matching; when ΔP≥25KPa, the actual boost pressure is too high. Generally, this situation only occurs due to pipeline leaks or abnormal combustion. The pipelines and combustion parameters of the target turbocharger should be checked carefully.

[0076] This embodiment determines that the voltage of the target booster 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 calibration voltage; it calculates a first difference between the first actual boost pressure and the first required boost pressure of the target booster at the current moment; if the first difference is greater than or equal to a first preset threshold, it determines that the target booster has a pipeline leakage fault or a combustion abnormality fault. This embodiment's method, even when the actuator voltage of the target booster is determined to be too low, can accurately detect whether there is a pipeline leakage fault or a combustion abnormality fault in the target booster based on the first actual boost pressure and the first required boost pressure of the target booster at the current moment.

[0077] refer to Figure 6 , Figure 6 This is a flowchart illustrating the third embodiment of the turbocharger fault diagnosis method of this application.

[0078] In one feasible implementation, step S40 may further include:

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

[0080] Step S404: Perform fault diagnosis on the target turbocharger based on the second actual boost pressure and the second required boost pressure corresponding to the target turbocharger at the current moment.

[0081] In the specific implementation, the same will be true. Figure 4 The voltages corresponding to the six points A, B, C, D, mechanical top dead center, and mechanical bottom dead center are respectively set as UA, UB, UC, UD, UE, and UF. In this embodiment, the above-mentioned target turbocharger can also be diagnosed based on these six points and their corresponding voltages.

[0082] In one feasible implementation, step S404 may include:

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

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

[0085] In practical implementation, when the actuator voltage U∈[UC, UF] of the target booster is too high, it indicates that the voltage of the target booster is too high, and the actual boost pressure is lower than the required boost pressure. Similarly, first confirm whether the actual boost pressure P2 (i.e., the second actual boost pressure mentioned above) and the required boost pressure P3 (i.e., the second required boost pressure mentioned above) can follow each other, and confirm the second difference between the actual boost pressure and the required boost pressure ΔP=|P0-P1| (at this time, the actual boost pressure is too low, so ΔP takes the absolute value). Assuming the 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 the voltage settings of calibration points B and D. Figure 4 Matching issue: When ΔP ≥ 25 kPa, the actual boost pressure is too low. Generally, abnormal wear of the booster transmission mechanism (wear voltage will be higher) will cause this phenomenon, so the booster should be the focus of the investigation.

[0086] This embodiment determines that the voltage of the target turbocharger is too high if the actuator voltage is greater than or equal to the first calibrated voltage and less than or equal to the mechanical bottom dead center voltage; it calculates a second difference between the second actual boost pressure and the second required boost pressure of the target turbocharger at the current moment; if the second difference is greater than or equal to a second preset threshold, it determines that the target turbocharger has an abnormal wear fault in the transmission mechanism. This embodiment's method, even when the actuator voltage of the target turbocharger is determined to be too high, can accurately detect whether there is an abnormal wear fault in the transmission mechanism of the target turbocharger based on the second actual boost pressure and the second required boost pressure of the target turbocharger at the current moment.

[0087] Furthermore, this application also proposes a storage medium storing a turbocharger fault diagnosis program, which, when executed by a processor, implements the steps of the turbocharger fault diagnosis method described above.

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

[0089] like Figure 7 As shown, the turbocharger fault diagnosis device proposed in this application includes:

[0090] The first range determination module 701 is used to determine the first voltage range of the target turbocharger based on the voltage characteristic curve of the target turbocharger. The first voltage range includes the mechanical top dead center voltage and the mechanical bottom dead center voltage.

[0091] The second range determination module 702 is used to determine a second voltage range of the target turbocharger based on the nozzle circulation volume of the target turbocharger, wherein the second voltage range includes a first calibration voltage and a second calibration 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 starting.

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

[0094] This embodiment determines a first voltage range for the target turbocharger based on its voltage characteristic curve. This first voltage range includes the mechanical top dead center voltage and the mechanical bottom dead center voltage. A second voltage range for the target turbocharger is determined based on the nozzle circulating gas volume. This second voltage range includes a first calibration voltage and a second calibration voltage. When the vehicle engine is detected to be starting, the actuator voltage of the target turbocharger at the current moment is acquired. Fault diagnosis of the target turbocharger is performed based on the first voltage range, the second voltage range, and the actuator voltage. This embodiment's method determines the voltage range of the target turbocharger based on its voltage characteristic curve and nozzle circulating gas volume. Then, fault diagnosis of the target turbocharger can be performed based on the voltage range and the voltage of the target turbocharger at the current moment, thereby avoiding engine performance degradation caused by using a faulty turbocharger while the vehicle is in operation.

[0095] Based on the first embodiment of the turbocharger fault diagnosis device described in this application, a second embodiment of the turbocharger fault diagnosis device of this application is proposed.

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

[0097] Furthermore, the fault diagnosis module 704 is also used to determine that the voltage of the target booster 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 calibration voltage; and to perform fault diagnosis on the target booster based on the first actual boost pressure and the first required boost pressure corresponding to the target booster at the current moment.

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

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

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

[0101] Other embodiments or specific implementations of the turbocharger fault diagnosis device of this application can be referred to the above-described method embodiments, and will not be repeated here.

[0102] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0103] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0104] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory / random access memory, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0105] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for diagnosing turbocharger faults, characterized in that, The method includes the following steps: The first voltage range of the target turbocharger is determined based on the voltage characteristic curve of the target turbocharger. The first voltage range includes the mechanical top dead center voltage and the mechanical bottom dead center voltage. The second voltage range of the target turbocharger is determined based on the nozzle circulation volume of the target turbocharger, and the second voltage range includes a first calibration voltage and a second calibration voltage; When the vehicle engine is detected to be starting, the actuator voltage of the target supercharger at the current moment is obtained; Fault diagnosis of the target booster is performed based on the first voltage range, the second voltage range, and the actuator voltage. The step of determining the second voltage range of the target turbocharger based on the nozzle circulation volume of the target turbocharger includes: Send a preset electrical signal to the target turbocharger to make the nozzle ring opening of the target turbocharger reach the minimum nozzle annular air volume position and the maximum nozzle annular air volume position; The first calibration voltage and the second calibration voltage of the target turbocharger are determined based on the voltages corresponding to the positions of maximum and minimum nozzle air volume, respectively.

2. The turbocharger fault diagnosis method as described in claim 1, characterized in that, The step of diagnosing the fault of the target booster 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 first calibration voltage, then the voltage of the target booster is determined to be too low. The target turbocharger is diagnosed for faults based on the first actual boost pressure and the first required boost pressure corresponding to the target turbocharger at the current moment.

3. The turbocharger fault diagnosis method as described in claim 2, characterized in that, The step of diagnosing the fault of the target turbocharger based on the first actual boost pressure and the first required boost pressure of the target turbocharger at the current moment includes: Calculate the first difference between the first actual boost pressure and the first required boost pressure of the target booster at the current moment; If the first difference is greater than or equal to the first preset threshold, it is determined that the target turbocharger has a pipeline leakage fault or an abnormal combustion fault.

4. The turbocharger fault diagnosis method as described in claim 1, characterized in that, The step of diagnosing the target booster 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 second rated voltage and less than or equal to the mechanical bottom dead center voltage, then the voltage of the target booster is determined to be too high. The target turbocharger is diagnosed for faults based on the second actual boost pressure and the second required boost pressure corresponding to the target turbocharger at the current moment.

5. The turbocharger fault diagnosis method as described in claim 4, characterized in that, The step of diagnosing the fault of the target turbocharger based on the second actual boost pressure and the second required boost pressure corresponding to the target turbocharger at the current moment includes: Calculate the second difference between the second actual boost pressure and the second required boost pressure corresponding to the target booster at the current moment; If the second difference is greater than or equal to the second preset threshold, it is determined that the target turbocharger has an abnormal wear fault in the transmission mechanism.

6. A turbocharger fault diagnosis device, characterized in that, The turbocharger fault diagnosis device includes: The first range determination module is used to determine a first voltage range of the target turbocharger based on the voltage characteristic curve of the target turbocharger. The first voltage range includes the mechanical top dead center voltage and the mechanical bottom dead center voltage. The second range determination module is used to determine a second voltage range of the target turbocharger based on the nozzle circulation volume of the target turbocharger, wherein the second voltage range includes a first calibration voltage and a second calibration voltage; The voltage acquisition module is used to acquire the actuator voltage of the target supercharger at the current moment when the vehicle engine is detected to be starting. The fault diagnosis module is used to perform fault diagnosis on the target booster based on the first voltage range, the second voltage range, and the actuator voltage. The step of determining the second voltage range of the target turbocharger based on the nozzle circulation volume of the target turbocharger includes: Send a preset electrical signal to the target turbocharger to make the nozzle ring opening of the target turbocharger reach the minimum nozzle annular air volume position and the maximum nozzle annular air volume position; The first calibration voltage and the second calibration voltage of the target turbocharger are determined based on the voltages corresponding to the positions of maximum and minimum nozzle air volume, respectively.

7. A turbocharger fault diagnosis device, characterized in that, The device includes: a memory, a processor, and a turbocharger fault diagnosis program stored in the memory and executable on the processor, the turbocharger fault diagnosis program being configured to implement the steps of the turbocharger fault diagnosis method as described in any one of claims 1 to 5.

8. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and the storage medium stores a turbocharger fault diagnosis program, which, when executed by a processor, implements the steps of the turbocharger fault diagnosis method as described in any one of claims 1 to 5.

9. A computer program product, characterized in that, The computer program product includes a turbocharger fault diagnosis program, which, when executed by a processor, implements the steps of the turbocharger fault diagnosis method as described in any one of claims 1 to 5.

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