Supercharging system fault diagnosis method, device, vehicle and storage medium

Abstract

The present invention provides a method, device, vehicle and storage medium for diagnosing faults in a supercharging system, which belongs to the field of engine technology. The method includes: determining a required pressure value and a fault diagnosis pressure target value at a supercharger outlet based on an engine speed value and a torque value; controlling the output pressure at the supercharger outlet based on the required pressure value, and obtaining a measured value of the output pressure; calculating the difference between the measured value of the output pressure and the fault diagnosis pressure target value, and judging whether the supercharging system is faulty based on the magnitude relationship between the difference and a preset fault diagnosis pressure difference threshold value and the duration of the magnitude relationship. The present invention improves the accuracy of supercharging system fault diagnosis without affecting the performance of the engine, and can better exert the engine performance.

Description

Technical Field

[0001] The present invention relates to the field of engine technology, and in particular to a method, a device, a vehicle and a storage medium for diagnosing faults in a boost system. Background Art

[0002] Currently, engines are generally equipped with superchargers to improve engine efficiency. Superchargers can effectively increase the engine's air intake, thereby improving engine combustion efficiency and reducing fuel consumption. When leakage or other faults occur in the engine supercharger-related pipelines, the engine's boost capacity decreases, affecting engine efficiency. It is necessary to diagnose the fault in a timely manner and remind corresponding maintenance.

[0003] The existing traditional diagnostic strategy for turbochargers generally uses a comparison between the actual pressure of the engine and the required pressure for diagnosis. To a certain extent, it can diagnose some boost-related faults of the engine supercharger. However, when the engine supercharger has a complex structure, more functions, and is more helpful in improving engine performance in the full operating range, only using the actual pressure of the engine and the required pressure for comparative diagnosis will not be accurate enough to diagnose supercharger faults in real time. When the output pressure does not match the required pressure, it may also affect the engine performance.

[0004] It can be seen that the prior art engine boost system control strategy has the technical problem of being unable to accurately diagnose the leakage fault of the boost system and may affect the engine performance. Summary of the invention

[0005] In view of this, it is necessary to provide a boost system fault diagnosis method, device, vehicle and storage medium to solve the technical problem that the prior art engine boost system control strategy cannot accurately diagnose the leakage fault of the boost system and may affect the engine performance.

[0006] In order to solve the above technical problems, on the one hand, the present invention provides a method for diagnosing faults of a boost system, comprising:

[0007] Determine a required pressure value and a fault diagnosis pressure target value of a supercharger outlet based on an engine speed value and a torque value;

[0008] Controlling the output pressure of the supercharger outlet based on the required pressure value, and obtaining a measured value of the output pressure;

[0009] The difference between the measured value of the output pressure and the fault diagnosis pressure target value is calculated, and whether the boost system is faulty is determined based on the magnitude relationship between the difference and a preset fault diagnosis pressure difference threshold value and the duration of the magnitude relationship.

[0010] As a possible implementation manner of the present invention, in this implementation manner, determining the required pressure value and the fault diagnosis pressure target value at the supercharger outlet based on the engine speed value and the torque value includes:

[0011] Obtain the speed and torque values ​​of the engine under the current working condition, and determine the required pressure value of the supercharger outlet in combination with the preset supercharger outlet pressure requirement MAP;

[0012] A fault diagnosis pressure target value corresponding to the speed value and the torque value is determined based on the speed value and the torque value in combination with a preset boost pressure diagnosis requirement MAP.

[0013] As a possible implementation of the present invention, in this implementation, controlling the output pressure of the supercharger outlet based on the required pressure value includes:

[0014] Determining the switching opening of the compressed air control unit based on the required pressure value and the intake air flow of the supercharger in combination with a preset supercharger compressor characteristic MAP;

[0015] The output pressure of the supercharger outlet is determined based on a preset driving pressure curve of the compressed air control unit in combination with the conversion opening, wherein the driving pressure curve is used to represent the relationship between the conversion opening and the output pressure of the supercharger outlet.

[0016] As a possible implementation manner of the present invention, in this implementation manner, judging whether the boost system is faulty based on the magnitude relationship between the difference and a preset fault diagnosis pressure difference threshold and the duration of the magnitude relationship includes:

[0017] When the difference is greater than a preset fault diagnosis pressure difference threshold and the duration is not less than a preset duration threshold, it is determined that an air leakage fault occurs in the boost system.

[0018] As a possible implementation manner of the present invention, in this implementation manner, after determining that the boost system has a gas leakage fault, the method includes:

[0019] determining a maximum fuel input amount of the engine based on the speed value;

[0020] The real-time fuel input amount of the engine is controlled to be no greater than the maximum fuel input amount.

[0021] As a possible implementation manner of the present invention, in this implementation manner, before obtaining the speed value and torque value of the engine under the current working condition, the method includes:

[0022] Obtain the real-time altitude of the vehicle's location, and determine the supercharger outlet pressure demand MAP and the boost pressure diagnosis demand MAP corresponding to the altitude, wherein the supercharger outlet pressure demand MAP corresponding to different altitudes is used to represent the relationship between the required pressure value of the supercharger outlet and the engine speed value and torque value at different altitudes, and the boost pressure diagnosis demand MAP corresponding to different altitudes is used to represent the relationship between the fault diagnosis pressure target value and the engine speed value and torque value at different altitudes.

[0023] As a possible implementation manner of the present invention, in this implementation manner, when the real-time altitude does not have a corresponding supercharger outlet pressure demand MAP and a boost pressure diagnosis demand MAP, the method of determining the supercharger outlet demand pressure value and the fault diagnosis pressure target value based on the engine speed value and the torque value includes:

[0024] Determine a first sampling altitude and a second sampling altitude adjacent to the altitude, wherein the sampling altitude is an altitude at which a corresponding supercharger outlet pressure demand MAP and a boost pressure diagnostic demand MAP exist;

[0025] Determine a first demand pressure value and a first fault diagnosis pressure target value based on a first supercharger outlet pressure demand MAP and a first boost pressure diagnosis demand MAP corresponding to the first sampling altitude; determine a second demand pressure value and a second fault diagnosis pressure target value based on a second supercharger outlet pressure demand MAP and a second boost pressure diagnosis demand MAP corresponding to the second sampling altitude;

[0026] A required pressure value of a supercharger outlet corresponding to the altitude is determined based on the first required pressure value and the second required pressure value, and a fault diagnosis pressure target value corresponding to the altitude is determined based on the first fault diagnosis pressure target value and the second fault diagnosis pressure target value.

[0027] On the other hand, the present invention also provides a boost system fault diagnosis device, comprising:

[0028] A pressure value acquisition module, used to determine a required pressure value at a supercharger outlet and a fault diagnosis pressure target value based on an engine speed value and a torque value;

[0029] A measured value acquisition module, used to control the output pressure of the supercharger outlet based on the required pressure value, and obtain the measured value of the output pressure;

[0030] The fault diagnosis module is used to calculate the difference between the measured value of the output pressure and the fault diagnosis pressure target value, and determine whether the boost system is faulty based on the size relationship between the difference and a preset fault diagnosis pressure difference threshold and the duration of the size relationship.

[0031] In another aspect, the present invention further provides a vehicle, comprising a memory and a processor, wherein:

[0032] The memory is used to store programs;

[0033] The processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps of the boost system fault diagnosis method described in any of the above implementations.

[0034] On the other hand, the present invention also provides a computer-readable storage medium for storing a computer-readable program or instruction, which, when executed by a processor, can implement the steps of the boost system fault diagnosis method described in any of the above-mentioned implementations.

[0035] The beneficial effects of the present invention are as follows: the method for diagnosing a fault in a supercharging system provided by the present invention obtains the required pressure value and the fault diagnosis pressure target value at the outlet of the engine supercharger respectively through the engine speed value and the torque value, controls the output pressure of the supercharger outlet based on the required pressure value, and obtains the actual measured value of the output pressure, and compares the actual measured value with the fault diagnosis pressure target value, so as to more accurately determine whether a leakage fault occurs in the supercharging system. At the same time, the required pressure value and the fault diagnosis pressure target value are separated, and the fault diagnosis will not affect the required pressure, that is, will not affect the performance of the engine, and can better exert the engine performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A schematic flow chart of a method for diagnosing a fault in a supercharging system provided by an embodiment of the present invention;

[0038] Figure 2 A schematic structural diagram of a boosting system provided by an embodiment of the present invention;

[0039] Figure 3 A flowchart of a method for implementing S101 provided in an embodiment of the present invention;

[0040] Figure 4 A flow chart of an output pressure control method provided by an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of a flow chart of an engine protection method provided by an embodiment of the present invention;

[0042] Figure 6 A flowchart of a method for fault diagnosis based on altitude provided by an embodiment of the present invention;

[0043] Figure 7 A schematic diagram of the structure of a boost system fault diagnosis device provided by an embodiment of the present invention;

[0044] Figure 8 A schematic structural diagram of a vehicle provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0046] The descriptions of "first", "second", etc. involved in the embodiments of the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the technical features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0047] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] The present invention provides a method, device, vehicle and storage medium for diagnosing faults in a boost system, which are described below respectively.

[0049] Figure 1 A schematic flow chart of an embodiment of a method for diagnosing a fault in a supercharging system provided by the present invention is shown in FIG. Figure 1 As shown, the boost system fault diagnosis method includes:

[0050] S101, determining a required pressure value and a fault diagnosis pressure target value of a supercharger outlet based on an engine speed value and a torque value;

[0051] S102, controlling the output pressure of the supercharger outlet based on the required pressure value, and obtaining a measured value of the output pressure;

[0052] S103, calculating the difference between the measured value of the output pressure and the fault diagnosis pressure target value, and judging whether the boost system is faulty based on the magnitude relationship between the difference and a preset fault diagnosis pressure difference threshold value and the duration of the magnitude relationship.

[0053] refer to Figure 2 The boost system fault diagnosis method provided by the embodiment of the present invention can be used for Figure 2 The engine supercharging system shown in the figure is controlled, and the supercharging system includes a compressed air control unit, a compressed air actuator unit, a supercharger and an ECU (electronic control unit), wherein the supercharger includes a supercharger turbine end and a supercharger pressure end, and the ECU determines the required pressure value of the supercharger pressure end outlet and the fault diagnosis pressure target value for diagnosing whether the supercharging system has a leak by obtaining the speed value and torque value of the engine under the current working condition, and sends the required pressure value to the compressed air control unit. The compressed air control unit controls the compressed air actuator unit to adjust the solenoid valve opening based on the required pressure value so that the supercharger pressure end outlet outputs compressed air that meets the pressure requirement value.

[0054] In the embodiment of the present invention, it should be noted that although the demand pressure value and the fault diagnosis pressure target value are both determined by the engine speed value and the torque value, the demand pressure value and the fault diagnosis pressure target value do not affect each other. The demand pressure value is used to control the output pressure at the outlet of the supercharger so that the actual measured value of the output pressure is as close to the demand pressure value as possible. The fault diagnosis pressure target value is used to compare with the actual measured value of the output pressure to determine whether a leak occurs in the supercharging system. In this way, even if a leak occurs in the supercharging system, the demand pressure will not change and will not affect the engine performance.

[0055] In an embodiment of the present invention, the actual value of the output pressure of the supercharger outlet can be measured by a pressure sensor at the supercharger pressure end outlet, and then the difference between the actual value and the fault diagnosis pressure target value is calculated, and the magnitude relationship between the difference and a preset fault diagnosis pressure difference threshold is compared, and whether the boost system fails is determined based on the maintenance duration of the magnitude relationship.

[0056] The method for diagnosing a fault in a supercharging system provided by the present invention obtains a demand pressure value and a fault diagnosis pressure target value at an outlet of an engine supercharger respectively through an engine speed value and a torque value, controls the output pressure at the outlet of the supercharger based on the demand pressure value, and obtains a measured value of the output pressure. By comparing the measured value with the fault diagnosis pressure target value, it is possible to more accurately determine whether a leakage fault occurs in the supercharging system. At the same time, the demand pressure value and the fault diagnosis pressure target value are separated, and the fault diagnosis will not affect the demand pressure, that is, will not affect the performance of the engine, and can better exert the engine performance.

[0057] As a possible implementation mode of the present invention, in this implementation mode, Figure 3 As shown, the required pressure value and the fault diagnosis pressure target value of the supercharger outlet are determined based on the engine speed value and the torque value, including:

[0058] S301, obtaining the speed value and torque value of the engine under the current working condition, and determining the required pressure value of the supercharger outlet in combination with the preset supercharger outlet pressure requirement MAP;

[0059] S302: Determine a fault diagnosis pressure target value corresponding to the speed value and the torque value based on the speed value and the torque value in combination with a preset boost pressure diagnosis requirement MAP.

[0060] In an embodiment of the present invention, the supercharger outlet pressure demand MAP and the boost pressure diagnostic demand MAP can be pre-calibrated based on the engine model, wherein the supercharger outlet pressure demand MAP refers to a relationship diagram for representing the engine speed, engine torque and supercharger outlet demand pressure. For ease of display, see Table 1. The horizontal axis of the supercharger outlet pressure demand MAP is the engine speed value, and the vertical axis is the engine torque value. By obtaining the real-time engine speed value and torque value, the demand pressure value of the supercharger outlet can be obtained by interpolation calculation.

[0061] Table 1: Example of supercharger outlet pressure requirement MAP

[0062]

[0063] In an embodiment of the present invention, the boost pressure diagnosis requirement MAP is shown in Table 2. The horizontal coordinate of the boost pressure diagnosis requirement MAP is the engine speed, and the vertical coordinate is the engine torque. By inputting the real-time engine speed value and torque value, the fault diagnosis pressure target value can be calculated by interpolation.

[0064] Table 2: Example of boost pressure diagnostic requirement MAP

[0065]

[0066] In an embodiment of the present invention, the supercharger outlet pressure demand MAP and the boost pressure diagnosis demand MAP are two separate MAPs. According to Table 1 and Table 2, the supercharger outlet pressure demand MAP has a larger coverage range, especially in the case of low speed and low torque, providing a larger demand pressure for the supercharger outlet to improve the response speed of the engine, while the boost pressure diagnosis demand MAP has a smaller coverage range, and can formulate a more accurate fault diagnosis pressure target value based on the engine speed value and torque value, so that the fault diagnosis result of the boost system is more accurate.

[0067] The embodiment of the present invention improves the diagnosis accuracy while reducing the impact on engine performance by separately determining the pressure requirement value and the fault diagnosis pressure target value.

[0068] As a possible implementation mode of the present invention, in this implementation mode, Figure 4 As shown, the output pressure of the booster outlet is controlled based on the required pressure value, including:

[0069] S401, determining a switching opening of a compressed air control unit based on a required pressure value and an intake air flow rate of a supercharger in combination with a preset supercharger compressor characteristic MAP;

[0070] S402, determining the output pressure of the supercharger outlet based on a preset driving pressure curve of the compressed air control unit in combination with the conversion opening, wherein the driving pressure curve is used to represent the relationship between the conversion opening and the output pressure of the supercharger outlet.

[0071] In the embodiment of the present invention, the supercharger compressor characteristic MAP is used to represent the relationship between the supercharger pressure ratio, the supercharger intake flow rate and the compression control unit conversion opening, specifically, as shown in Table 3:

[0072] Table 3: Example of turbocharger compressor characteristic MAP

[0073]

[0074] Among them, the horizontal axis of the supercharger compressor characteristic MAP is the intake flow rate, the vertical axis is the compression control unit conversion opening, and the Z axis is the boost ratio, wherein the boost ratio is the ratio of the required pressure value to the atmospheric pressure of the vehicle environment, that is, after determining the required pressure value of the supercharger outlet, the boost ratio can be calculated in combination with the current atmospheric pressure, and the intake flow of the supercharger can be measured by the flow sensor. Based on this, the conversion opening of the compression control unit can be reversely calculated by the interpolation method. Further, when the supercharger's boost ratio is less than the minimum boost ratio corresponding to the supercharger compressor characteristic MAP, the conversion opening of the output compression control unit adopts the conversion opening of the compression control unit corresponding to the minimum pressure ratio under the air flow in the supercharger compressor characteristic MAP; when the supercharger's boost ratio is greater than the maximum boost ratio corresponding to the supercharger compressor characteristic MAP, the conversion opening of the output compression control unit adopts the conversion opening of the compression control unit corresponding to the maximum boost ratio under the air flow in the supercharger compressor characteristic MAP.

[0075] In the embodiment of the present invention, the driving pressure curve of the compressed air control unit is used to represent the relationship between the conversion opening of the compressed air control unit and the output pressure of the supercharger outlet. For the convenience of display, the relationship between the horizontal and vertical coordinates of the driving pressure curve is displayed in a table form, as shown in Table 4:

[0076] Table 4: Drive pressure curve horizontal and vertical coordinate relationship table

[0077] Conversion opening 0 10 20 30 40 50 60 70 80 90 100 Driving pressure 200 180 160 140 120 100 80 60 40 20 0

[0078] Among them, the horizontal axis in the horizontal and vertical coordinate relationship table of the driving pressure curve is the conversion opening of the compression control unit, and the vertical axis is the output pressure of the supercharger outlet. After the conversion opening of the compression control unit is obtained through the above-mentioned supercharger compressor characteristic MAP, the output pressure of the supercharger outlet can be calculated by the interpolation algorithm.

[0079] The embodiment of the present invention converts the required pressure value into the conversion opening of the compression control unit, and adjusts the output pressure of the supercharger in combination with the driving pressure curve of the compressed air control unit to ensure that the output pressure meets the required pressure value.

[0080] As a possible implementation of the present invention, in this implementation, judging whether the boost system is faulty based on the magnitude relationship between the difference value and a preset fault diagnosis pressure difference threshold value and the duration of the magnitude relationship includes:

[0081] When the difference is greater than a preset fault diagnosis pressure difference threshold and the duration is not less than a preset duration threshold, it is determined that a gas leakage fault occurs in the boost system.

[0082] In an embodiment of the present invention, when judging whether a gas leakage fault occurs in a supercharging system, a fault diagnosis pressure difference threshold and a duration threshold can be preset. When the difference between the measured value of the output pressure and the fault diagnosis pressure target value is greater than the fault diagnosis pressure difference threshold, and the duration is not less than the duration threshold, it can be judged that a gas leakage fault occurs in the supercharging system. It should be noted that an embodiment of the present invention aims to judge whether a gas leakage fault occurs in a supercharging system based on the measured value of the output pressure and the fault diagnosis pressure target value. The specific judgment method can be the method of the above-mentioned embodiment. However, other schemes for judging whether a supercharging system is faulty based on the measured value of the output pressure and the fault diagnosis pressure target value are not excluded. For example, schemes such as modifying the fault diagnosis pressure difference threshold, duration threshold, etc. of the above-mentioned embodiment should all be within the protection scope of the present invention.

[0083] As a possible implementation mode of the present invention, in this implementation mode, Figure 5 As shown in the figure, after judging that the boost system has a gas leakage fault, the following steps are performed:

[0084] S501, determining a maximum fuel input amount of the engine based on the rotation speed value;

[0085] S502, controlling the real-time fuel input of the engine to be not greater than the maximum fuel input.

[0086] In the embodiment of the present invention, in order to ensure the safety of the supercharger, after it is determined that the supercharging system has a gas leakage fault, the maximum fuel input amount input to the engine can be determined based on the engine speed through a pre-set engine protection strategy, as shown in Table 5:

[0087] Table 5: Maximum oil protection strategy table

[0088]

[0089] Based on the real-time engine speed, the maximum fuel input of the engine is determined by the difference calculation method, and the real-time fuel input of the engine is controlled not to be greater than the maximum fuel input to ensure the safety of the engine and the supercharger.

[0090] As a possible implementation manner of the present invention, in this implementation manner, before obtaining the speed value and torque value of the engine under the current working condition, the following steps are included:

[0091] Obtain the real-time altitude of the vehicle's location, and determine the supercharger outlet pressure demand MAP and boost pressure diagnosis demand MAP corresponding to the altitude, wherein the supercharger outlet pressure demand MAP corresponding to different altitudes is used to represent the relationship between the required pressure value of the supercharger outlet and the engine speed value and torque value at different altitudes, and the boost pressure diagnosis demand MAP corresponding to different altitudes is used to represent the relationship between the fault diagnosis pressure target value and the engine speed value and torque value at different altitudes.

[0092] In an embodiment of the present invention, when the vehicle is located at different altitudes, the atmospheric pressure of the environment is also different, which will affect the determination of the pressure demand value and the fault diagnosis pressure target value by the boost system. Therefore, it is necessary to pre-formulate a plurality of supercharger outlet pressure demand MAPs and boost pressure diagnosis demand MAPs at different altitudes. Before determining the demand pressure and the fault diagnosis pressure target value of the supercharger outlet, it is necessary to first determine the supercharger outlet pressure demand MAP and the boost pressure diagnosis demand MAP corresponding to the current altitude.

[0093] Further, such as Figure 6 As shown, when the real-time altitude does not have a corresponding supercharger outlet pressure demand MAP and boost pressure diagnosis demand MAP, the required pressure value of the supercharger outlet and the fault diagnosis pressure target value are determined based on the engine speed value and the torque value, including:

[0094] S601, determining a first sampling altitude and a second sampling altitude adjacent to the altitude, wherein the sampling altitude is an altitude at which a corresponding supercharger outlet pressure demand MAP and a boost pressure diagnostic demand MAP exist;

[0095] S602, determining a first demand pressure value and a first fault diagnosis pressure target value based on a first supercharger outlet pressure demand MAP and a first boost pressure diagnosis demand MAP corresponding to a first sampling altitude; determining a second demand pressure value and a second fault diagnosis pressure target value based on a second supercharger outlet pressure demand MAP and a second boost pressure diagnosis demand MAP corresponding to a second sampling altitude;

[0096] S603, determining a required pressure value of a supercharger outlet corresponding to the altitude based on the first required pressure value and the second required pressure value, and determining a fault diagnosis pressure target value corresponding to the altitude based on the first fault diagnosis pressure target value and the second fault diagnosis pressure target value.

[0097] In the embodiment of the present invention, due to the continuity of the altitude, it is impossible to formulate the corresponding supercharger outlet pressure demand MAP and boost pressure diagnosis demand MAP for each altitude. The corresponding supercharger outlet pressure demand MAP and boost pressure diagnosis demand MAP can be formulated for each sampling altitude by sampling. When the altitude of the vehicle is less than the minimum sampling altitude, the supercharger outlet pressure demand MAP and boost pressure diagnosis demand MAP corresponding to the minimum altitude are directly adopted. When the altitude of the vehicle is greater than the maximum sampling altitude, the supercharger outlet pressure demand MAP and boost pressure diagnosis demand MAP corresponding to the maximum altitude are directly adopted. When the altitude of the vehicle is between the minimum sampling altitude and the maximum sampling altitude, and is not the sampling altitude, it is necessary to determine the corresponding demand pressure value and fault diagnosis pressure value based on the sampling altitude adjacent to the altitude.

[0098] Specifically, the atmospheric pressure corresponding to the altitude of the vehicle is The atmospheric pressures at two adjacent sampling altitudes are and The required pressure values ​​corresponding to two adjacent sampling altitudes are and , and the corresponding diagnostic pressure thresholds are and Based on this, the required pressure value of the supercharger can be calculated using formula (1) and formula (2): and fault diagnosis pressure target value :

[0099] (1)

[0100] (2)

[0101] In an embodiment of the present invention, by determining the required pressure value and fault diagnosis pressure target value of the supercharger according to the altitude, the output pressure of the supercharger can be controlled more accurately, and it can be more accurately determined whether the supercharging system has a leakage fault, thereby avoiding errors caused by the altitude.

[0102] In order to better implement the boost system fault diagnosis method in the embodiment of the present invention, based on the boost system fault diagnosis method, correspondingly, Figure 7 As shown, the embodiment of the present invention further provides a boost system fault diagnosis device, the boost system fault diagnosis device 700 includes:

[0103] A pressure value acquisition module 701 is used to determine a required pressure value at a supercharger outlet and a fault diagnosis pressure target value based on an engine speed value and a torque value;

[0104] The measured value acquisition module 702 is used to control the output pressure of the supercharger outlet based on the required pressure value and obtain the measured value of the output pressure;

[0105] The fault diagnosis module 703 is used to calculate the difference between the measured value of the output pressure and the fault diagnosis pressure target value, and determine whether the boost system is faulty based on the size relationship between the difference and a preset fault diagnosis pressure difference threshold and the duration of the size relationship.

[0106] The boost system fault diagnosis device 700 provided in the above embodiment can implement the technical solution described in the above boost system fault diagnosis method embodiment. The specific implementation principles of the above modules or units can refer to the corresponding contents in the above boost system fault diagnosis method embodiment, which will not be repeated here.

[0107] The boost system fault diagnosis device 700 provided by the present invention obtains the demand pressure value and the fault diagnosis pressure target value of the engine supercharger outlet through the engine speed value and the torque value respectively, and controls the supercharger outlet output pressure based on the demand pressure value, and obtains the measured value of the output pressure. By comparing the measured value with the fault diagnosis pressure target value, it can more accurately determine whether a leakage fault occurs in the boost system. At the same time, the demand pressure value and the fault diagnosis pressure target value are separated. Fault diagnosis will not affect the demand pressure, that is, it will not affect the performance of the engine, and the engine performance can be better exerted.

[0108] like Figure 8 As shown, the present invention also provides a vehicle 800. The vehicle 800 includes a processor 801, a memory 802 and a display 803. Figure 8 Only some of the components of vehicle 800 are shown, but it should be understood that implementation of all of the components shown is not a requirement, and more or fewer components may alternatively be implemented.

[0109] In some embodiments, the processor 801 may be a central processing unit (CPU), a microprocessor or other data processing chip, and is used to run program codes or process data stored in the memory 802, such as the boost system fault diagnosis method of the present invention.

[0110] In some embodiments, the processor 801 may be a single server or a server group. The server group may be centralized or distributed. In some embodiments, the processor 801 may be local or remote. In some embodiments, the processor 801 may be implemented in a cloud platform. In one embodiment, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, a multi-cloud, etc., or any combination thereof.

[0111] In some embodiments, the memory 802 may be an internal storage unit of the vehicle 800, such as a hard disk or memory of the vehicle 800. In other embodiments, the memory 802 may also be an external storage device of the vehicle 800, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc., equipped on the vehicle 800.

[0112] Furthermore, the memory 802 may include both an internal storage unit of the vehicle 800 and an external storage device. The memory 802 is used to store application software installed in the vehicle 800 and various data.

[0113] In some embodiments, the display 803 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, etc. The display 803 is used to display information of the vehicle 800 and to display a visual user interface. The components 801-803 of the vehicle 800 communicate with each other via a system bus.

[0114] In one embodiment, when the processor 801 executes the boost system control program in the memory 802, the following steps may be implemented:

[0115] Determine a required pressure value and a fault diagnosis pressure target value of a supercharger outlet based on an engine speed value and a torque value;

[0116] Controlling the output pressure of the supercharger outlet based on the required pressure value, and obtaining the measured value of the output pressure;

[0117] The difference between the actual output pressure and the fault diagnosis pressure target value is calculated, and whether the boost system is faulty is determined based on the magnitude relationship between the difference and a preset fault diagnosis pressure difference threshold and the duration of the magnitude relationship.

[0118] It should be understood that: when the processor 801 executes the boost system control program in the memory 802, in addition to the above functions, other functions can also be implemented. For details, please refer to the description of the corresponding method embodiment above.

[0119] Correspondingly, an embodiment of the present invention also provides a computer-readable storage medium, which is used to store computer-readable programs or instructions. When the program or instructions are executed by a processor, the steps or functions of the boost system fault diagnosis method provided by the above-mentioned method embodiments can be implemented.

[0120] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware (such as a processor, a controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0121] The above is a detailed introduction to the boost system fault diagnosis method, device, vehicle and storage medium provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for diagnosing faults in a supercharging system, characterized in that: include: Determine a required pressure value and a fault diagnosis pressure target value of a supercharger outlet based on an engine speed value and a torque value; Controlling the output pressure of the supercharger outlet based on the required pressure value, and obtaining a measured value of the output pressure; Calculating the difference between the measured value of the output pressure and the fault diagnosis pressure target value, and judging whether the boost system is faulty based on the magnitude relationship between the difference and a preset fault diagnosis pressure difference threshold value and the duration of the magnitude relationship; The method of determining the required pressure value and the fault diagnosis pressure target value of the supercharger outlet based on the engine speed value and the torque value includes: Obtain the speed and torque values ​​of the engine under the current working condition, and determine the required pressure value of the supercharger outlet in combination with the preset supercharger outlet pressure requirement MAP; A fault diagnosis pressure target value corresponding to the speed value and the torque value is determined based on the speed value and the torque value in combination with a preset boost pressure diagnosis requirement MAP.

2. The boost system fault diagnosis method according to claim 1, characterized in that: Controlling the output pressure of the booster outlet based on the required pressure value includes: Determining the switching opening of the compressed air control unit based on the required pressure value and the intake air flow of the supercharger in combination with a preset supercharger compressor characteristic MAP; The output pressure of the supercharger outlet is determined based on a preset driving pressure curve of the compressed air control unit in combination with the conversion opening, wherein the driving pressure curve is used to represent the relationship between the conversion opening and the output pressure of the supercharger outlet.

3. The boost system fault diagnosis method according to claim 1, characterized in that: The determining whether the boost system is faulty based on the magnitude relationship between the difference and a preset fault diagnosis pressure difference threshold and the duration of the magnitude relationship comprises: When the difference is greater than a preset fault diagnosis pressure difference threshold and the duration is not less than a preset duration threshold, it is determined that an air leakage fault occurs in the boost system.

4. The method for diagnosing a fault in a supercharging system according to claim 3, characterized in that: After determining that the boost system has a gas leakage fault, the method includes: determining a maximum fuel input amount of the engine based on the speed value; The real-time fuel input amount of the engine is controlled to be no greater than the maximum fuel input amount.

5. The method for diagnosing a fault in a supercharging system according to claim 1, characterized in that: Before obtaining the speed value and torque value of the engine under the current working condition, the method includes: Obtain the real-time altitude of the vehicle's location, and determine the supercharger outlet pressure demand MAP and the boost pressure diagnosis demand MAP corresponding to the altitude, wherein the supercharger outlet pressure demand MAP corresponding to different altitudes is used to represent the relationship between the required pressure value of the supercharger outlet and the engine speed value and torque value at different altitudes, and the boost pressure diagnosis demand MAP corresponding to different altitudes is used to represent the relationship between the fault diagnosis pressure target value and the engine speed value and torque value at different altitudes.

6. The boost system fault diagnosis method according to claim 5, characterized in that: When the real-time altitude has no corresponding supercharger outlet pressure demand MAP and boost pressure diagnosis demand MAP, the method of determining the supercharger outlet demand pressure value and the fault diagnosis pressure target value based on the engine speed value and the torque value includes: Determine a first sampling altitude and a second sampling altitude adjacent to the altitude, wherein the sampling altitude is an altitude at which a corresponding supercharger outlet pressure demand MAP and a boost pressure diagnostic demand MAP exist; Determine a first demand pressure value and a first fault diagnosis pressure target value based on a first supercharger outlet pressure demand MAP and a first boost pressure diagnosis demand MAP corresponding to the first sampling altitude; determine a second demand pressure value and a second fault diagnosis pressure target value based on a second supercharger outlet pressure demand MAP and a second boost pressure diagnosis demand MAP corresponding to the second sampling altitude; A required pressure value of a supercharger outlet corresponding to the altitude is determined based on the first required pressure value and the second required pressure value, and a fault diagnosis pressure target value corresponding to the altitude is determined based on the first fault diagnosis pressure target value and the second fault diagnosis pressure target value.

7. A boost system fault diagnosis device, applicable to the boost system fault diagnosis method according to any one of claims 1 to 6, characterized in that: include: A pressure value acquisition module, used to determine a required pressure value at a supercharger outlet and a fault diagnosis pressure target value based on an engine speed value and a torque value; A measured value acquisition module, used to control the output pressure of the supercharger outlet based on the required pressure value, and obtain the measured value of the output pressure; The fault diagnosis module is used to calculate the difference between the measured value of the output pressure and the fault diagnosis pressure target value, and determine whether the boost system is faulty based on the size relationship between the difference and a preset fault diagnosis pressure difference threshold and the duration of the size relationship.

8. A vehicle, characterized in that: comprising a memory and a processor, wherein: The memory is used to store programs; The processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps of the boost system fault diagnosis method described in any one of claims 1 to 6 above.

9. A computer-readable storage medium, characterized in that: Used to store computer-readable programs or instructions, which, when executed by a processor, can implement the steps of the boost system fault diagnosis method described in any one of claims 1 to 6.

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