Method and device for diagnosing rationality of supercharging capacity of supercharged engine

Abstract

The invention relates to a method and a device for diagnosing the rationality of the supercharging capacity of a supercharged engine. The method comprises the following steps: determining a standard threshold value of the opening degree of a supercharging actuator; the actual opening average value of the supercharging actuator under the current working condition is obtained; and comparing the difference between the actual opening average value of the supercharging actuator and the standard opening threshold value of the supercharging actuator under the same working condition to judge whether a supercharging rationality fault occurs or not. On the premise that normal control of the engine is not affected, the influence of ignition efficiency and the like on the opening degree of the supercharging actuator is recognized, the opening degree threshold value of the supercharging actuator is updated, and meanwhile the judgment difference for judging faults of the supercharging system is updated in real time along with passing of the life cycle of the engine and aging of the supercharging system; whether the capacity of the supercharging system is abnormal or not is recognized, maintenance is conducted as soon as possible when problems occur, and therefore the influence on the dynamic property and economical efficiency of an engine is reduced.

Description

Technical Field

[0001] The present invention relates to the field of engine control, and more specifically, to a method and device for diagnosing the rationality of supercharging capability of a supercharged engine. Background Art

[0002] In order to respond to the engine intake boost and engine torque increase request, the boost system is controlled to achieve more exhaust energy to achieve boost. The boost control determines the engine's power and economy, etc. Therefore, it is urgent to diagnose the boost control system and determine whether the boost system has performance problems as soon as possible. When problems occur, repairs can be carried out as soon as possible to reduce the impact on the engine's power and economy. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for diagnosing the rationality of the supercharging ability of a supercharged engine, which can diagnose the ability of the supercharging control system and determine whether the supercharging system has performance problems as early as possible.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a method for diagnosing the rationality of supercharging capacity of a supercharged engine, comprising:

[0005] Determine the standard threshold value of the boost actuator opening;

[0006] Get the actual average opening of the boost actuator in the current working condition;

[0007] Compare the difference between the actual average opening of the boost actuator and the standard threshold value of the boost actuator opening under the same working conditions to determine whether a boost rationality fault occurs.

[0008] According to the above scheme, the standard threshold value pct of the boost actuator opening BoostActuatorLim Calculated by the following formula:

[0009]

[0010] Where, pct BoostActuatorBase is the boost actuator opening reference value, dm CylinderBase is the actual engine intake flow reference value, dm Cylinder is the average value of the actual intake flow rate of the engine, r Spark is the average ignition efficiency, r BaseSpark is the average value of basic ignition efficiency, and λ is the average value of air excess coefficient.

[0011] According to the above scheme, and The methods for obtaining include:

[0012] On the engine test bench, when the target boost pressure is fixed, set When λ=1, the actual boost actuator opening is obtained, that is, the boost actuator opening reference value pct BoostActuatorBase , and then in different The influence of λ on the opening of the boost actuator is calibrated.

[0013] According to the above scheme, the method for judging whether a boost rationality fault occurs is: when one of the following two conditions is met, it indicates that a boost rationality unconfirmed fault occurs once; otherwise, it indicates that a boost rationality fault does not occur:

[0014] Case 1

[0015] The throttle valve is fully open and pct BoostActuator -pct BoostActuatorLim ≥Δ 1 ;

[0016] Case 2

[0017] The throttle valve is not fully open, and

[0018]

[0019] The fully open state means that the ratio of the actual engine intake pressure to the throttle inlet gas pressure is not less than the preset value; Δ 1 is the opening threshold, Δ 1 =C×(1+r Adapt ), C is a constant, r Adapt is the self-learning correction value; p BfThrAct is the actual average pressure at the engine throttle inlet, p AftThrAct is the average value of the actual intake pressure of the engine, It is the ratio of the average actual intake pressure of the engine to the average actual pressure at the throttle inlet.

[0020] According to the above scheme, during each driving cycle of the vehicle, the boost rationality fault is detected at most once. If the detection has been completed, the current driving cycle will not be detected again until the next driving cycle of the vehicle meets the diagnostic conditions. After each detection is completed, the number of times the diagnosis is satisfied CNT1 and the number of times no fault is diagnosed CNT2 will be recorded and stored, and saved after the vehicle is powered off.

[0021] According to the above scheme, if the number of occurrences CNT1 is greater than the preset value, and the vehicle mileage L used for boost rationality diagnosis exceeds the preset value, and CNT2 is 0, the self-learning correction value r Adapt Updated to: Adapt =r Adapt (z)-0.02, where r Adapt(z) is the self-learning correction value of the last updated learning. After the update is completed, CNT1, CNT2, and L are cleared and then accumulated and updated again.

[0022] According to the above scheme, if the number of occurrences CNT1 is greater than the preset value, and the vehicle mileage L used for boost rationality diagnosis exceeds the preset value, and CNT2 is 10, the self-learning correction value r Adapt Updated to: Adapt =r Adapt (z)+0.01, where r Adapt (z) is the self-learning correction value of the last updated learning. After the update is completed, CNT1, CNT2, and L are cleared and then accumulated and updated again.

[0023] According to the above scheme, the self-learning correction value r Adapt The value increased by each update is greater than the self-learning correction value r Adapt The value that decreases with each update is small.

[0024] According to the above scheme, after entering the supercharged engine boost rationality diagnosis, the engine speed, the actual engine intake flow, the engine water temperature, the actual engine intake pressure, and the target boost pressure are all the same and are considered to be the same operating conditions.

[0025] The present invention also provides a device for diagnosing the rationality of supercharging capability of a supercharged engine, comprising:

[0026] A standard threshold determination module, used for determining a standard threshold of the opening of the boost actuator;

[0027] The module for obtaining the average opening degree is used to obtain the actual average opening degree of the boost actuator in the current working condition;

[0028] The judgment module is used to compare the difference between the actual opening average value of the boost actuator and the standard threshold value of the boost actuator opening under the same working conditions to judge whether a boost rationality fault occurs.

[0029] The present invention also provides an automobile, comprising the above-mentioned device for diagnosing the rationality of supercharging capacity of a supercharged engine.

[0030] The present invention also provides an electronic device, comprising: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; a computer program is stored in the memory, and when the program is executed by the processor, the processor executes the steps of the method for diagnosing the rationality of the boosting capacity of the supercharged engine.

[0031] The present invention also provides a computer-readable storage medium on which executable instructions are stored. When the instructions are executed by a processor, the processor implements the method for diagnosing the rationality of the supercharging capacity of a supercharged engine.

[0032] The method and device for diagnosing the rationality of supercharging capacity of a supercharged engine according to the present invention have the following beneficial effects:

[0033] The present invention identifies the influence of ignition efficiency and the like on the opening of the boost actuator without affecting the normal control of the engine, and updates the threshold of the boost actuator opening. At the same time, as the life cycle of the engine progresses and as the boost system ages, the present invention updates the difference in judging boost system failures in real time, identifies whether the boost system capacity is abnormal, and performs maintenance as soon as possible when problems occur, thereby reducing the influence on the power and economy of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0035] Figure 1 is a flow chart of a method for diagnosing rationality of supercharging capability of a supercharged engine according to the present invention;

[0036] Figure 2 It is a logic block diagram of the method for diagnosing the rationality of the supercharging ability of a supercharged engine according to the present invention. DETAILED DESCRIPTION

[0037] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0038] Embodiment 1

[0039] The method for diagnosing the rationality of the supercharging capacity of a supercharged engine of the present invention needs to meet certain conditions, which are as follows:

[0040] 1. The boost control is in a closed-loop control state. The boost control closed-loop control conditions can be found in patent CN201910988050.8 "Exhaust gas turbine engine boost closed-loop adaptive system and control method";

[0041] 2. The engine speed fluctuation is within the preset range. In this example, the preset range is ±15rpm;

[0042] 3. The actual intake pressure of the engine (the actual value of the intake pressure at the throttle outlet, i.e. the actual value of the gas pressure entering the cylinder) fluctuates within the preset range. In this example, ±2kPa is taken;

[0043] 4. The target intake pressure of the engine (the target intake pressure at the throttle outlet, i.e. the target pressure of the gas entering the cylinder) fluctuates within a preset range. In this example, ±2 kPa is taken;

[0044] 5. The difference between the target opening of the boost actuator and the actual opening (the larger the opening, the stronger the boost capability, the opening changes from 0% to 100%) is within the preset range, which is ±1% in this example;

[0045] 6. The throttle opening fluctuation is within the preset range, in this example ±1%;

[0046] 7. The actual opening fluctuation of the boost actuator is within the preset range, which is ±1% in this example;

[0047] 8. The target boost pressure (for details, see patent CN202010109549.X "Method for determining target boost pressure of exhaust gas turbocharger engine, storage medium") fluctuates within a preset range, and in this example, it is ±2kPa.

[0048] 9. The difference between the target boost pressure and the actual boost pressure is within a preset range, which is ±2 kPa in this example.

[0049] 10. The engine water temperature is within the preset range, which is 60℃~100℃ in this example, and the engine water temperature fluctuation is within the preset range, which is ±3℃ in this example;

[0050] 11. The difference between the target air-fuel ratio and the actual air-fuel ratio is within the preset range, which is ±0.05 in this example;

[0051] 12. The target air-fuel ratio fluctuation is within the preset range, which is ±0.02 in this example;

[0052] 13. The final ignition angle efficiency of the engine fluctuates within a preset range, which in this example is ±0.05;

[0053] 14. The basic ignition angle efficiency of the engine fluctuates within a preset range, and in this example, ±0.05 is used; the definition of the basic ignition angle efficiency can be found in patent CN202110717601.4 "Calculation method, computer equipment and storage medium for basic ignition efficiency of the engine";

[0054] 15. The engine has not been cut off from fuel;

[0055] 16. EGR rate is 0;

[0056] 17. No fault occurs in the sensors related to the boost system;

[0057] 18. No fault occurs in the actuators related to the boost system;

[0058] 19. No GPF related faults occurred;

[0059] 20. No catalyst-related faults occurred;

[0060] 21. No boost rationality fault diagnosis was performed in this vehicle driving cycle.

[0061] The supercharged engine boost rationality diagnosis can only be performed after all the above conditions are met for more than the preset time t0, which is 2 seconds in this example. If all the above conditions are not met during the supercharged engine boost rationality diagnosis, the diagnosis is terminated. The supercharged system performance fault data can only be recorded and collected again after the conditions are met again in this driving cycle.

[0062] like Figure 1 As shown, the method for diagnosing the rationality of the supercharging capacity of a supercharged engine includes the following steps:

[0063] S1. Determine the standard threshold value of the boost actuator opening.

[0064] Booster actuator opening standard threshold pct BoostActuatorLim Compared with the actual opening average value of the boost actuator pct BoostActuator , ignition efficiency average value r Spark 、Basic ignition efficiency average value r BaseSpark , average value of excess air coefficient λ, average value of actual engine intake flow dm Cylinder , the actual engine intake flow rate reference value dm CylinderBase related.

[0065]

[0066] The ignition efficiency affects the exhaust energy, thus affecting the ability of the boost control itself. Under the same engine intake flow, the lower the ignition efficiency, the greater the exhaust energy, and the smaller the boost actuator opening can achieve the same boost pressure. Therefore, under the same boost pressure, the smaller the boost actuator opening; the engine intake flow also affects the exhaust capacity. The larger the intake flow, the smaller the boost actuator opening can achieve the same boost pressure; the larger the average value of the air excess coefficient λ, the more air accounts for the mixed gas, and the higher the exhaust temperature is relatively. Under the same engine intake density, the smaller the exhaust energy, and thus the larger the boost actuator opening can achieve the same boost pressure.

[0067] Actual engine intake flow rate reference value dm CylinderBase , is the reference value of the intake flow rate, which is 15g / s in this example, where and The method of obtaining the boost pressure is to first set the target boost pressure on the engine test bench. When λ=1, the actual boost actuator opening is obtained, that is, the boost actuator opening reference value pct BoostActuatorBase , and then in different The influence of the opening of the boost actuator under λ is calibrated. Based on this, the calibration data of this example are shown in Table 1 and Table 2:

[0068] Table 1

[0069]

[0070] Table 2

[0071]

[0072] S2. Obtain the actual average opening degree of the boost actuator under the current working condition.

[0073] After entering the turbocharger rationality diagnosis of the turbocharged engine, the same engine speed, actual engine intake flow, engine water temperature, actual engine intake pressure, and target boost pressure are considered to be the same operating conditions. Calculate the average current engine speed, the average actual engine intake flow, the average engine water temperature, the average actual engine throttle inlet pressure, the average actual engine intake pressure, the average target boost pressure, the average engine exhaust temperature, the average engine ignition angle efficiency, the average actual opening of the boost actuator, and the average value of the ratio of the actual air-fuel ratio to the ideal air-fuel ratio. The actual air-fuel ratio can be detected by the wide-range oxygen sensor in the exhaust system. The equivalent air-fuel ratio in this example is 14.3, which is determined by the oil quality. The ratio of the actual air-fuel ratio to the ideal air-fuel ratio is referred to as the air excess coefficient.

[0074] S3. Compare the difference between the actual average opening of the boost actuator and the standard threshold value of the boost actuator opening under the same working conditions to determine whether a boost rationality fault occurs.

[0075] Case 1

[0076] The throttle valve enters the fully open state, which means that the ratio of the actual engine intake pressure to the throttle valve inlet gas pressure is not less than a preset value, which is 0.98 in this example; and the throttle valve opening exceeds the preset value, which is 95% in this example.

[0077] pct BoostActuator -pct BoostActuatorLim ≥Δ 1

[0078] Case 2

[0079] The throttle valve is not fully open, and

[0080]

[0081] When one of the above two conditions is met, it indicates that the boost rationality failure has occurred once, otherwise it indicates that the boost rationality failure has not occurred. Once the number of times the boost rationality failure has not been confirmed exceeds the preset number of times, which is 50 times in this example, it indicates that the boost rationality failure has occurred. After the boost capacity fails, the boost rationality diagnosis will no longer be performed until the fault is cleared by the after-sales 4S shop.

[0082] Among them, Δ 1 is the opening threshold, Δ 1 =C×(1+r Adapt ), C is a constant, which is 5% in this example. Adapt is the self-learning correction value, its initial value is 0, and it can be saved when the vehicle is powered off. As shown in Table 3, p BfThrAct is the actual average pressure at the engine throttle inlet, p AftThrAct It is the actual average value of the engine intake pressure. It is based on the ratio of the average actual intake pressure of the engine to the average actual pressure at the throttle inlet. The smaller the ratio, the greater the throttle effect of the throttle, and a greater boost capacity is required to maintain the stability of the boost pressure. Therefore, the larger the opening of the boost actuator, the greater the threshold value will be appropriately increased.

[0083] Table 3

[0084]

[0085]

[0086] During each driving cycle of the vehicle, the boost rationality fault is detected at most once. If the detection has been completed, the current driving cycle will not be detected again until the next driving cycle of the vehicle meets the diagnostic conditions. After each detection is completed, the number of times the diagnosis is satisfied CNT1 and the number of times the diagnosis is not faulty CNT2 will be recorded and stored, and saved after the vehicle is powered off.

[0087] Case 1: If the number of occurrences CNT1 is greater than the preset value (10,000 times in this example), 2) the vehicle mileage L used for boost rationality diagnosis exceeds the preset value (10,000 kilometers in this example), 3) CNT2 is 0, then the self-learning correction value r Adapt Updated to: Adapt =r Adapt (z)-0.02, where r Adapt (z) is the self-learning correction value of the last updated learning. After the update is completed, CNT1, CNT2, and L are all cleared to 0, and then accumulated and updated again.

[0088] Case 2: If the number of occurrences CNT1 is greater than the preset value (100 times in this example), 2) the vehicle mileage L used for boost rationality diagnosis exceeds the preset value (8,000 kilometers in this example), 3) CNT2 is 10, then the self-learning correction value r Adapt Updated to: Adapt =r Adapt (z)+0.01, where r Adapt (z) is the self-learning correction value of the last updated learning. After the update is completed, CNT1, CNT2, and L are all cleared to 0, and then accumulated and updated again.

[0089] In other cases, Adapt =r Adapt (z).

[0090] It should be noted that the self-learning correction value r Adapt The value increased each time (in this example, 0.01 each time) is greater than the self-learning correction value r Adapt The reason why the value decreased each time (in this example, it decreases by 0.02 each time) is small is that the update of the threshold value will not make it more difficult to diagnose the fault. This is mainly because the probability of supercharging failure is greater as the supercharging life cycle continues to advance, and the loss of engine power and economy due to failure to timely judge the supercharging failure is avoided.

[0091] Embodiment 2

[0092] The present invention also provides a device for diagnosing the rationality of supercharging capability of a supercharged engine, comprising:

[0093] A standard threshold determination module, used for determining a standard threshold of the opening of the boost actuator;

[0094] The module for obtaining the average opening degree is used to obtain the actual average opening degree of the boost actuator in the current working condition;

[0095] The judgment module is used to compare the difference between the actual opening average value of the boost actuator and the standard threshold value of the boost actuator opening under the same working conditions to judge whether a boost rationality fault occurs.

[0096] Embodiment 3

[0097] The present invention also provides an automobile, comprising a device for diagnosing the rationality of supercharging capability of a supercharged engine.

[0098] Embodiment 4

[0099] The present invention also provides an electronic device, comprising: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; a computer program is stored in the memory, and when the program is executed by the processor, the processor executes the steps of the method for diagnosing the rationality of the boosting capacity of the supercharged engine.

[0100] Embodiment 5

[0101] The present invention also provides a computer-readable storage medium on which executable instructions are stored. When the instructions are executed by a processor, the processor implements the method for diagnosing the rationality of the supercharging capacity of a supercharged engine.

[0102] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0103] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0104] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0105] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0106] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A method for diagnosing the rationality of supercharging capability of a supercharged engine, characterized in that: include: Determine the standard threshold value of the boost actuator opening; Get the actual average opening of the boost actuator in the current working condition; Compare the difference between the actual average opening of the boost actuator and the standard threshold value of the boost actuator opening under the same working conditions to determine whether a boost rationality fault occurs.

2. The method for diagnosing rationality of supercharging capability of a supercharged engine according to claim 1, characterized in that: Standard threshold pct of boost actuator opening BoostActuatorLim Calculated by the following formula: Where, pct BoostActuatorBase is the boost actuator opening reference value, dm CylinderBase is the actual intake flow rate reference value of the engine, dm Cylinder is the average value of the actual intake flow rate of the engine, r Spark is the average ignition efficiency, r BaseSpark is the average value of basic ignition efficiency, and λ is the average value of air excess coefficient.

3. The method for diagnosing the rationality of supercharging capability of a supercharged engine according to claim 2, characterized in that: and The methods for obtaining include: On the engine test bench, when the target boost pressure is fixed, set When λ=1, the actual boost actuator opening is obtained, that is, the boost actuator opening reference value pct BoostActuatorBase , and then in different The influence of λ on the opening of the boost actuator is calibrated.

4. The method for diagnosing the rationality of supercharging capability of a supercharged engine according to claim 2, characterized in that: The method for judging whether a boost rationality fault occurs is: when one of the following two conditions is met, it indicates that a boost rationality unconfirmed fault occurs once; otherwise, it indicates that a boost rationality fault does not occur: Case 1 The throttle valve is fully open and |pct BoostActuator -pct BoostActuatorLim |≥Δ1; Case 2 The throttle valve is not fully open, and The fully open state means that the ratio of the actual engine intake pressure to the throttle inlet gas pressure is not less than the preset value; Δ1 is the opening threshold, Δ1 = C × (1 + r Adapt ), C is a constant, r Adapt is the self-learning correction value; p BfThrAct is the actual average pressure at the engine throttle inlet, p AftThrAct is the average value of the actual intake pressure of the engine, It is the ratio of the average actual intake pressure of the engine to the average actual pressure at the throttle inlet.

5. The method for diagnosing rationality of supercharging capability of a supercharged engine according to claim 4, characterized in that: During each driving cycle of the vehicle, the boost rationality fault is detected at most once. If the detection has been completed, the current driving cycle will not be tested again until the next driving cycle of the vehicle meets the diagnostic conditions. After each detection is completed, the number of times the diagnosis is satisfied CNT1 and the number of times no fault is diagnosed CNT2 will be recorded and stored, and saved after the vehicle is powered off.

6. The method for diagnosing rationality of supercharging capability of a supercharged engine according to claim 5, characterized in that: If the number of occurrences CNT1 is greater than the preset value, and the vehicle mileage L used for boost rationality diagnosis exceeds the preset value, and CNT2 is 0, the self-learning correction value r Adapt Updated to: Adapt =r Adapt (z)-0.02, where r Adapt (z) is the self-learning correction value of the last updated learning. After the update is completed, CNT1, CNT2, and L are cleared and then accumulated and updated again.

7. The method for diagnosing rationality of supercharging capability of a supercharged engine according to claim 6, characterized in that: If the number of occurrences CNT1 is greater than the preset value, and the vehicle mileage L used for boost rationality diagnosis exceeds the preset value, and CNT2 is 10, the self-learning correction value r Adapt Updated to: Adapt =r Adapt (z)+0.01, where r Adapt (z) is the self-learning correction value of the last updated learning. After the update is completed, CNT1, CNT2, and L are cleared and then accumulated and updated again.

8. The method for diagnosing rationality of supercharging capability of a supercharged engine according to claim 7, characterized in that: Self-learning correction value r Adapt The value increased by each update is greater than the self-learning correction value r Adapt The value that decreases with each update is small.

9. The method for diagnosing rationality of supercharging capability of a supercharged engine according to claim 1, characterized in that: After entering the supercharged engine boost rationality diagnosis, if the engine speed, actual engine intake flow, engine water temperature, actual engine intake pressure and target boost pressure are all the same, it is determined that the operating conditions are the same.

10. A device for diagnosing the rationality of supercharging capacity of a supercharged engine, characterized in that: include: A standard threshold determination module, used for determining a standard threshold of the opening of the boost actuator; The module for obtaining the average opening degree is used to obtain the actual average opening degree of the boost actuator in the current working condition; The judgment module is used to compare the difference between the actual opening average value of the boost actuator and the standard threshold value of the boost actuator opening under the same working conditions to judge whether a boost rationality fault occurs.

11. A car, characterized in that: It comprises the device for diagnosing rationality of supercharging capacity of a supercharged engine as claimed in claim 10.

12. An electronic device comprising: A processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; characterized in that a computer program is stored in the memory, and when the program is executed by the processor, the processor executes the steps of the method for diagnosing the rationality of the supercharging capacity of a supercharged engine as described in any one of claims 1 to 9.

13. A computer-readable storage medium having executable instructions stored thereon, characterized in that: When the instruction is executed by the processor, the processor implements the method for diagnosing the rationality of the supercharging capacity of a supercharged engine as described in any one of claims 1 to 9.

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