An engine torque accuracy detection method, system, electronic device and medium

Abstract

This invention discloses a method, system, electronic device, and medium for detecting engine torque accuracy. The method includes: creating torque accuracy detection conditions: after receiving a command to activate engine torque accuracy detection, the controller issues a torque accuracy detection request; executing the detection method: detecting the engine operating conditions, the controller sends a speed / torque command to the P1 configuration system to generate electricity, and calculates the engine torque accuracy measurement values ​​under each operating condition based on preset engine speed and requested engine torque, forming a full-condition checklist; determining whether the engine torque accuracy measurement values ​​are qualified: setting a torque accuracy qualification threshold for each operating condition, if the engine torque accuracy measurement value is greater than the torque accuracy qualification threshold, it is qualified; if the engine torque accuracy measurement value is less than the torque accuracy qualification threshold, torque correction is performed. Through this invention, the torque accuracy of the engine is evaluated and corrected, thereby improving the engine torque accuracy.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and more specifically to a method, system, electronic device, and medium for detecting engine torque accuracy. Background Technology

[0002] For hybrid vehicles, in order to meet consumers' multi-dimensional needs for vehicle economy, power and comfort, developing hybrid vehicles with different configurations has become an inevitable choice for all OEMs, such as the common P1 hybrid architecture.

[0003] Chinese invention application CN202011169369.7 describes a method for detecting the accuracy of torque estimation using a hydraulic torque converter. The method involves using a curve to be tested as a characteristic curve relating engine speed to estimated torque, and a standard curve relating the pump impeller speed of a hydraulic automatic transmission to measured torque. The standard curve, obtained under the same operating conditions, is used as a reference to determine the gap between the two curves, and the accuracy of the curve to be tested is then determined based on this gap value. This control method primarily enables the measurement of torque estimation accuracy for engines already installed in vehicles, thereby testing the accuracy of the engine's torque signal transmission and improving the performance of other control units in controlling the vehicle based on engine torque. However, this invention cannot assess torque accuracy for powertrains without a hydraulic torque converter. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the present invention provides a method, system, electronic device and medium for detecting engine torque accuracy, for evaluating torque accuracy of power systems without hydraulic torque converters.

[0005] To achieve the above effects, the technical solution of the present invention is as follows:

[0006] In a first aspect, the present invention provides a method for detecting the accuracy of engine torque, comprising the following steps:

[0007] S1: Create torque accuracy detection conditions: After receiving the command to activate engine torque accuracy detection, the controller issues a torque accuracy detection request;

[0008] S2: Determine whether the torque accuracy detection requirement meets the preset conditions. If not, return to step S1; if yes, proceed to the next step.

[0009] S3: Execution detection method: Detect the engine operating condition, the controller sends speed / torque commands to the P1 configuration system to generate electricity, and calculates the average torque of the engine within a preset time value under steady state. The average torque is used as the actual net torque value of the engine. Based on the preset engine speed and engine requested torque, the engine torque accuracy measurement value under each operating condition is calculated to form a full operating condition checklist.

[0010] S4: Determine if the engine torque accuracy measurement value is qualified: Set the torque accuracy qualification threshold for each operating condition. If the engine torque accuracy measurement value is greater than the torque accuracy qualification threshold, it is qualified. If the engine torque accuracy measurement value is less than the torque accuracy qualification threshold, torque correction is performed.

[0011] In the above scheme, the controller is either a vehicle control unit (VCU) or a power domain controller (PCU). The P1 configuration mainly refers to the motor position; it means that the ISG motor is fixedly connected to the engine, replacing the traditional flywheel and supporting functions such as power assist, engine start-stop, and regenerative braking. The engine torque is measured by the ECU. The engine speed is obtained through a vehicle-preset speed sensor. The engine is a P1 configuration engine, installed in a P1 configuration system where the engine and generator are directly connected in a hybrid vehicle. This invention considers the extremely high accuracy of the motor torque and its resistance to attenuation due to external factors, using it as the benchmark for engine torque detection.

[0012] Furthermore, prior to step S1, the process also includes: activating engine torque accuracy detection, specifically:

[0013] 1) The maintenance personnel can directly activate the torque accuracy detection command by entering the corresponding password into the vehicle system diagnostic interface through the diagnostic tool;

[0014] 2) The controller is triggered by a self-test program, which activates the torque accuracy detection command after the engine has been running for a certain period of time;

[0015] 3) If the difference between the engine net torque signal value and the actual engine net torque value * (-1) exceeds the set ratio when the engine is in steady-state operation, the torque accuracy detection command will be activated.

[0016] Furthermore, the torque accuracy detection requirement is as follows:

[0017] 1) Request engine operation;

[0018] 2) Put the P1 configuration system in series;

[0019] 3) Through the thermal management system, the engine coolant temperature, engine intake air temperature, and motor temperature are kept within a certain temperature range;

[0020] 4) The battery SOC is maintained within the preset range or the battery SOC charge / discharge power boundary is greater than the preset value;

[0021] 5) The vehicle is in P gear, meaning the vehicle is stationary.

[0022] Furthermore, the detection of engine operating conditions includes at least one of the following torque accuracy detection methods:

[0023] 1) Full-condition torque accuracy test: Select a set speed from the lowest engine operating speed to the highest engine operating speed at each engine speed interval. At each preset engine speed, scan from the lowest set engine torque value to the highest set engine torque value according to the preset engine requested torque interval value, and perform a full-point scan test.

[0024] 2) Targeted torque accuracy testing for common operating conditions: Based on engine characteristics and engine operating conditions, the test detects the optimal efficiency point for each power output and the optimal power output point for each engine speed.

[0025] 3) Independent working condition optimization point review: The torque accuracy test for all working conditions is broken down and the torque accuracy test is performed according to the set engine speed and the set engine torque value.

[0026] Furthermore, based on preset engine speed and requested engine torque, the accuracy measurement values ​​of engine torque under various operating conditions are calculated to form a full-condition checklist, specifically as follows:

[0027] The preset engine speed range is 1500rpm to 6000rpm; the minimum engine operating speed is 1500rpm and the maximum engine operating speed is 6000rpm.

[0028] The requested torque range of the engine is 10 N·m to 100 N·m; the minimum set torque value and the engine torque interval value of the engine are 10 N·m; the maximum set torque value of the engine is 100 N·m.

[0029] Engine torque accuracy measurement value = Actual net engine torque value * Motor speed ratio to engine speed ratio * (-1) / Net engine torque.

[0030] Furthermore, the torque correction is specifically as follows:

[0031] The ECU measures the actual value of the engine's net torque. If the actual value of the engine's net torque is lower than the preset value of the engine's net torque, the torque is compensated. If the actual value of the engine's net torque is higher than the preset value of the engine's net torque, the torque is reduced.

[0032] If the previous torque accuracy test was a full-condition torque accuracy test or an independent condition optimization point review, then the current torque accuracy test will proceed to the independent condition optimization point review; if the previous torque accuracy test was a common-condition targeted torque accuracy test, then the current torque accuracy test will proceed to the common-condition targeted torque accuracy test.

[0033] Furthermore, after step S4, the process also includes: selecting any one of the following conditions to end the engine torque accuracy detection:

[0034] 1) All measured values ​​of engine torque accuracy are qualified;

[0035] 2) The torque correction method reaches the preset number of times;

[0036] 3) A high-priority engine shutdown command is issued.

[0037] Secondly, the present invention provides a system for detecting engine torque accuracy, comprising:

[0038] The detection activation module is used to activate the engine torque accuracy detection.

[0039] The torque accuracy detection requirement setting module is used by the controller to issue a torque accuracy detection requirement after receiving the command to activate engine torque accuracy detection.

[0040] The torque accuracy measurement module is used to detect the engine operating conditions. The controller sends speed / torque commands to the P1 configuration system to generate electricity. It calculates the average torque of the engine within a preset time value under steady state and uses the average torque as the actual net torque value of the engine. Based on the preset engine speed and requested engine torque, it calculates the engine torque accuracy measurement value under each operating condition and forms a full-condition checklist.

[0041] The torque accuracy qualification module is used to determine whether the measured value of engine torque accuracy is qualified: set the torque accuracy qualification threshold for each operating condition. If the measured value of engine torque accuracy is greater than the torque accuracy qualification threshold, it is qualified. If the measured value of engine torque accuracy is less than the torque accuracy qualification threshold, torque correction is performed.

[0042] Thirdly, the present invention provides an electronic device including a memory and a processor, wherein the memory stores a computer program and the processor is configured to execute a method for detecting engine torque accuracy through the computer program.

[0043] Fourthly, the present invention provides a computer-readable storage medium comprising a stored computer program, wherein the computer program, when executed, performs a method for detecting engine torque accuracy.

[0044] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0045] This invention improves the efficiency of engine torque accuracy detection by creating torque accuracy detection conditions and designing an engine torque accuracy detection method. By using a high-precision P1 motor as the torque detection benchmark, the invention calculates the measured engine torque accuracy under various operating conditions, forming a full-condition checklist to evaluate and correct the engine torque accuracy, thereby improving engine torque accuracy. This invention can obtain the torque accuracy of the required torque of the P1 configuration system under different torque components during vehicle operation, so that the clutch can compensate for the torque according to the torque accuracy of the hybrid system, reducing the control error caused by the difference between the measured engine torque accuracy and the actual net engine torque. Attached Figure Description

[0046] Figure 1 This is a flowchart illustrating a method for detecting engine torque accuracy according to the present invention.

[0047] Figure 2 This is a schematic diagram of the electronic device for detecting engine torque accuracy in this invention. Detailed Implementation

[0048] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0049] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0050] Before introducing the embodiments of the present invention, the relevant terms involved in the embodiments of the present invention are first defined as follows:

[0051] SOC: State of Charge, or remaining charge.

[0052] ECU: Electronic Control Unit.

[0053] Example

[0054] This embodiment proposes a method for detecting engine torque accuracy. Please refer to [link / reference]. Figure 1 This includes the following steps:

[0055] S1: Create torque accuracy detection conditions: After receiving the command to activate engine torque accuracy detection, the controller issues a torque accuracy detection request;

[0056] S2: Determine whether the torque accuracy detection requirement meets the preset conditions. If not, return to step S1; if yes, proceed to the next step.

[0057] S3: Execute the detection method: detect the engine operating condition, the controller sends speed / torque commands to the P1 configuration system to generate electricity, and calculates the average torque of the engine within a preset time value under steady state. The average torque is used as the actual net torque value of the engine. Based on the preset engine speed and engine requested torque, the engine torque accuracy measurement value under each operating condition is calculated to form a full operating condition checklist as the detection result.

[0058] S4: Determine if the engine torque accuracy measurement value is qualified: Set the torque accuracy qualification threshold for each operating condition. If the engine torque accuracy measurement value is greater than the torque accuracy qualification threshold, it is qualified. If the engine torque accuracy measurement value is less than the torque accuracy qualification threshold, torque correction is performed.

[0059] The full-condition checklist is accessed via the engine electronic control unit software program.

[0060] As a preferred technical solution, in this embodiment, before step S1, the method further includes: activating engine torque accuracy detection, specifically:

[0061] 1) The maintenance personnel can directly activate the torque accuracy detection command by entering the corresponding password into the vehicle system diagnostic interface through the diagnostic tool;

[0062] 2) The controller is triggered by a self-test program, which activates the torque accuracy detection command after the engine has been running for a certain period of time;

[0063] 3) When the engine is in steady-state operation (such as when the speed and torque are stable at idle), if the difference between the engine net torque signal value and the actual engine net torque value * (-1) exceeds the set ratio, the torque accuracy detection command will be activated.

[0064] As a preferred technical solution, in this embodiment, the torque accuracy detection requirement is as follows:

[0065] 1) Request the engine to run so that the engine can be tested;

[0066] 2) Put the P1 configuration system in series. The purpose of the series connection is to decouple the engine from the wheel ends.

[0067] 3) The thermal management system keeps the engine coolant temperature, engine intake air temperature, and motor temperature within a certain range. The main purpose of controlling the temperature of each module is to create reasonable detection conditions.

[0068] 4) The battery SOC is kept within the preset range or the battery SOC charging and discharging power boundary is greater than the preset value. At this time, the battery power is neither high nor low. In order to make the battery rechargeable torque accurate detection of the energy generated under the working condition, and to prevent battery damage.

[0069] 5) Set the vehicle to P gear, which means the vehicle is stationary (the vehicle gear may be changed depending on the battery capacity and safety considerations for testing; keeping it in P gear ensures the vehicle is in a safe state).

[0070] As a preferred technical solution, in this embodiment, the detection of engine operating conditions includes at least one of the following torque accuracy detection methods:

[0071] 1) Full-condition torque accuracy test: Select a set speed from the lowest engine operating speed to the highest engine operating speed at each engine speed interval. At each preset engine speed, scan from the lowest set engine torque value to the highest set engine torque value according to the preset engine requested torque interval value, and perform a full-point scan test.

[0072] 2) Targeted torque accuracy testing for common operating conditions: Based on engine characteristics and engine operating conditions, the test detects the optimal efficiency point for each power output and the optimal power output point for each engine speed.

[0073] Understandably, if the developers design rule-based engine operating conditions based on design requirements (e.g., if the selected speed is determined by power, then the optimal speed and torque point at this power level is selected), then only the torque accuracy detection of the rule-based operating conditions is required.

[0074] 3) Independent operating condition optimization point review: The torque accuracy test for all operating conditions is broken down into separate tests, and the torque accuracy test is performed according to the set engine speed and set engine torque value, thereby improving efficiency in the review stage.

[0075] Understandably, taking full-condition torque accuracy testing as an example, as shown in Table 1, the system subdivides into independent operating conditions and sends corresponding speed and torque commands to the P1 configuration system. After the engine has been running stably for a certain period of time, the testing for each independent operating condition ends. The independent operating condition optimization point review involves maintenance personnel setting the engine speed and torque values ​​according to their own needs, and then performing torque accuracy testing.

[0076] As a preferred technical solution, in this embodiment, the step of calculating the engine torque accuracy measurement value under each operating condition based on the preset engine speed and requested engine torque to form a full-condition checklist is specifically as follows:

[0077] The engine speed interval is 500 rpm;

[0078] The preset engine speed range is 1500rpm to 6000rpm; the minimum engine operating speed is 1500rpm and the maximum engine operating speed is 6000rpm.

[0079] The requested torque range of the engine is 10 N·m to 100 N·m; the minimum set torque value and the engine torque interval value of the engine are 10 N·m; the maximum set torque value of the engine is 100 N·m.

[0080] Engine torque accuracy measurement value = actual net engine torque * motor-engine speed ratio * (-1) / engine net torque; the actual net engine torque value is the P1 motor torque.

[0081] In this embodiment, the torque accuracy qualification threshold is 95%.

[0082] Understandably, engine net torque refers to the torque at the engine flywheel end, which is a basic signal provided by the engine control module and measured through the following methods: braking the vehicle and pressing the accelerator pedal; stabilizing the engine at different speeds for 5 seconds. The re-check phase refers to a second check after torque accuracy testing across all operating conditions from 1500-6000 rpm. Points without issues can be skipped, while problematic points, such as 2000 rpm, can be scanned again starting from 10 N·m to the maximum torque.

[0083] The test result is the torque accuracy test condition in the fourth step. If the design is a full-condition torque accuracy test, then the full-condition torque accuracy test form is qualified; if it is a re-inspection after the full-condition torque accuracy test, then it is an independent condition; if it is for targeted torque accuracy test or rapid torque accuracy test, then it is a commonly used condition targeted torque accuracy test condition.

[0084] As a preferred technical solution, in this embodiment, the torque correction is specifically performed as follows:

[0085] The ECU measures the actual value of the engine net torque, which is the P1 motor torque * (-1), and optimizes the engine net torque signal value. If the actual value of the engine net torque is lower than the preset value of the engine net torque, the torque is compensated; if the actual value of the engine net torque is higher than the preset value of the engine net torque, the torque is reduced.

[0086] Understandably, the specific method for achieving torque compensation is to adjust the torque corresponding to the optimal firing angle of the engine's theoretical operating point; a suitable compensation value can be provided through PI control.

[0087] If the previous torque accuracy test was a full-condition torque accuracy test or an independent condition optimization point review, then the current torque accuracy test will proceed to the independent condition optimization point review; if the previous torque accuracy test was a common-condition targeted torque accuracy test, then the current torque accuracy test will proceed to the common-condition targeted torque accuracy test.

[0088] As a preferred technical solution, in this embodiment, after step S4, the method further includes: selecting any one of the following conditions to end the engine torque accuracy detection:

[0089] 1) All measured values ​​of engine torque accuracy are qualified;

[0090] 2) The torque correction method reaches the preset number of times;

[0091] 3) A high-priority engine shutdown command is issued.

[0092] It should be noted that the existing "evaluation of torque accuracy of power systems without hydraulic torque converters" is mainly achieved through a hub dynamometer. Compared with testing torque accuracy through a hub dynamometer, the present invention is more convenient, economical and operable, which is beneficial for drivability, energy management, fault diagnosis and other controls, improves the accuracy of wheel-end torque in parallel operation, improves the smoothness of series-parallel switching, optimizes the engine selection and setting speed in series operation and the diagnostic post-processing logic for large deviations in design accuracy that cannot be self-corrected, and facilitates self-inspection in repair shops.

[0093] Table 1. Torque Accuracy Test Table under All Operating Conditions

[0094]

[0095] The full-condition torque accuracy test chart refers to the engine speed starting from 1500 rpm in the first row, and the torque accuracy is measured from 10 N·m all the way up to 100 N·m (assuming the maximum torque is only 100 N·m); then starting from 2000 rpm in the second row, the torque accuracy is measured from 10 N·m all the way up to 100 N·m, and so on up to the maximum speed of 6000 rpm; 10, 20, 30... refer to the engine's requested torque; 95% refers to the torque accuracy.

[0096] In another embodiment of the present invention, an engine torque accuracy detection system is also provided, comprising:

[0097] The detection activation module is used to activate the engine torque accuracy detection.

[0098] The torque accuracy detection requirement setting module is used by the controller to issue a torque accuracy detection requirement after receiving the command to activate engine torque accuracy detection.

[0099] The torque accuracy measurement module is used to detect the engine operating conditions. The controller sends speed / torque commands to the P1 configuration system to generate electricity. It calculates the average torque of the engine within a preset time value under steady state and uses the average torque as the actual net torque value of the engine. Based on the preset engine speed and requested engine torque, it calculates the engine torque accuracy measurement value under each operating condition and forms a full-condition checklist.

[0100] The torque accuracy qualification module is used to determine whether the measured value of engine torque accuracy is qualified: set the torque accuracy qualification threshold for each operating condition. If the measured value of engine torque accuracy is greater than the torque accuracy qualification threshold, it is qualified. If the measured value of engine torque accuracy is less than the torque accuracy qualification threshold, torque correction is performed.

[0101] like Figure 2 In another embodiment of the present invention, an electronic device is also provided, comprising:

[0102] Memory 101 is used to store one or more computer programs;

[0103] The processor 102 is configured to execute a computer program to implement the steps of a method for detecting engine torque accuracy as described in any of the above embodiments.

[0104] In this embodiment, the computer system suitable for implementing the electronic device of the present invention includes a Central Processing Unit (CPU), which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) or a program loaded from storage into random access memory (RAM), such as performing the methods described in the above embodiments. Various programs and data required for system operation are also stored in RAM. The CPU, ROM, and RAM are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus.

[0105] The following components are connected to the I / O interface: input sections including keyboards, mice, etc.; output sections including cathode ray tubes (CRTs), liquid crystal displays (LCDs), and speakers; storage sections including hard drives; and communication sections including network interface cards such as LAN (Local Area Network) cards and modems. The communication sections perform communication processing via networks such as the Internet. Drives are also connected to the I / O interface as needed. Removable media, such as disks, optical discs, magneto-optical discs, semiconductor memories, etc., are installed on the drive as needed so that computer programs read from them can be installed into the storage section as required.

[0106] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing computer programs for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication component, and / or installed from a removable medium. When the computer program is executed by a central processing unit (CPU), it performs various functions defined in the system of the present invention.

[0107] It should be noted that although several modules or units of the device for performing actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0108] In this embodiment, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a computer's processor, causes the computer to perform a method for detecting engine torque accuracy as provided in any of the foregoing embodiments. This computer-readable storage medium may be included in the electronic device described in the above embodiments, or it may exist independently and not be assembled into the electronic device.

[0109] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, portable hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, touch terminal, or network device, etc.) to execute the method according to the embodiments of the present invention.

[0110] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for detecting engine torque accuracy, characterized in that, Includes the following steps: S1: Create torque accuracy detection conditions: After receiving the command to activate engine torque accuracy detection, the controller issues a torque accuracy detection request; S2: Determine whether the torque accuracy detection requirement meets the preset conditions. If not, return to step S1; if yes, proceed to the next step. S3: Execution detection method: Detect the engine operating condition. The controller sends a speed / torque command to the P1 configuration system to generate electricity. The average torque of the engine under steady state within a preset time value is statistically analyzed, and the average torque is taken as the actual net torque value of the engine. The actual net torque value of the engine is the torque of the P1 motor. Based on the preset engine speed and requested engine torque, the engine torque accuracy measurement value under each operating condition is calculated to form a full-condition checklist. The engine torque accuracy measurement value = P1 motor torque * motor to engine speed ratio * (-1) / engine net torque. S4: Determine if the engine torque accuracy measurement value is qualified: Set the torque accuracy qualification threshold for each operating condition. If the engine torque accuracy measurement value is greater than the torque accuracy qualification threshold, it is qualified. If the engine torque accuracy measurement value is less than the torque accuracy qualification threshold, torque correction is performed.

2. The method for detecting engine torque accuracy according to claim 1, characterized in that, Before step S1, the process also includes: activating engine torque accuracy detection, specifically: 1) The maintenance personnel can directly activate the torque accuracy detection command by entering the corresponding password into the vehicle system diagnostic interface through the diagnostic tool; 2) The controller is triggered by a self-test program, which activates the torque accuracy detection command after the engine has been running for a certain period of time; 3) If the difference between the engine net torque signal value and the actual engine net torque value * (-1) exceeds the set ratio when the engine is in steady-state operation, the torque accuracy detection command will be activated.

3. The method for detecting engine torque accuracy according to claim 1, characterized in that, The torque accuracy detection requirement is as follows: 1) Request engine operation; 2) Put the P1 configuration system in series; 3) Through the thermal management system, the engine coolant temperature, engine intake air temperature, and motor temperature are kept within a certain temperature range; 4) The battery SOC is maintained within the preset range or the battery SOC charge / discharge power boundary is greater than the preset value; 5) The vehicle is in P gear, meaning the vehicle is stationary.

4. The method for detecting engine torque accuracy according to claim 1, characterized in that, The detection of engine operating conditions includes at least one of the following torque accuracy detection conditions: 1) Full-condition torque accuracy test: Select a set speed from the lowest engine operating speed to the highest engine operating speed at each engine speed interval. At each preset engine speed, scan from the lowest set engine torque value to the highest set engine torque value according to the preset engine requested torque interval value, and perform a full-point scan test. 2) Targeted torque accuracy testing for common operating conditions: Based on engine characteristics and engine operating conditions, the system detects the optimal efficiency point for each power output and the optimal power output point for each engine speed. 3) Independent working condition optimization point review: The torque accuracy test for all working conditions is broken down and the torque accuracy test is performed according to the set engine speed and the set engine torque value.

5. The method for detecting engine torque accuracy according to claim 4, characterized in that, The process involves calculating the engine torque accuracy measurement values ​​under various operating conditions based on preset engine speed and requested engine torque, forming a full-condition checklist, specifically as follows: The preset engine speed range is 1500rpm~6000rpm; the minimum engine operating speed is 1500rpm and the maximum engine operating speed is 6000rpm. The requested torque range of the engine is 10 N·m to 100 N·m; the minimum set torque value and the engine torque interval value are 10 N·m. The engine's maximum set torque is 100 N·m.

6. The method for detecting engine torque accuracy according to claim 1, characterized in that, The torque correction is specifically as follows: The ECU measures the actual value of the engine's net torque. If the actual value of the engine's net torque is lower than the preset value of the engine's net torque, the torque is compensated. If the actual value of the engine's net torque is higher than the preset value of the engine's net torque, the torque is reduced. If the previous torque accuracy test was a full-condition torque accuracy test or an independent condition optimization point review, then the current torque accuracy test will proceed to the independent condition optimization point review; if the previous torque accuracy test was a common-condition targeted torque accuracy test, then the current torque accuracy test will proceed to the common-condition targeted torque accuracy test.

7. The method for detecting engine torque accuracy according to claim 1, characterized in that, Step S4 is followed by selecting any one of the following conditions to end the engine torque accuracy test: 1) All measured values ​​of engine torque accuracy are qualified; 2) The torque correction method reaches the preset number of times; 3) A high-priority engine shutdown command is issued.

8. A system for detecting engine torque accuracy, characterized in that, include: The detection activation module is used to activate the engine torque accuracy detection. The torque accuracy detection requirement setting module is used by the controller to issue a torque accuracy detection requirement after receiving the command to activate engine torque accuracy detection. The torque accuracy measurement module is used to detect the engine operating conditions. The controller sends speed / torque commands to the P1 configuration system to generate electricity, and calculates the average torque of the engine within a preset time value under steady state. The average torque is used as the actual net torque value of the engine. The actual net torque value of the engine is the torque of the P1 motor. Based on the preset engine speed and requested engine torque, the engine torque accuracy measurement value under each operating condition is calculated to form a full-condition checklist. The engine torque accuracy measurement value = P1 motor torque * motor-engine speed ratio * (-1) / engine net torque. The torque accuracy qualification module is used to determine whether the measured value of engine torque accuracy is qualified: set the torque accuracy qualification threshold for each operating condition. If the measured value of engine torque accuracy is greater than the torque accuracy qualification threshold, it is qualified. If the measured value of engine torque accuracy is less than the torque accuracy qualification threshold, torque correction is performed.

9. An electronic device comprising a memory and a processor, characterized in that, The memory stores a computer program, and the processor is configured to execute, through the computer program, a method for detecting engine torque accuracy according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored computer program, wherein the computer program, when executed, performs a method for detecting engine torque accuracy according to any one of claims 1 to 7.

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