Electric drive system efficiency test method, device and equipment and storage medium

Abstract

The invention relates to the technical field of whole vehicle testing, and discloses an electric drive system efficiency testing method, device and equipment and a storage medium, and the method comprises the steps: detecting the operation data of an electric drive system when a vehicle operates from a first state to a second state in a set power consumption mode under each set working condition, the operation data comprises an input end voltage of the electric drive system, a first current of an input end positive electrode, a second current of an input end negative electrode, a driving shaft torque and a driving shaft rotating speed; according to the operation data, the electric drive system efficiency of the vehicle under each set working condition is calculated; and determining the comprehensive efficiency of the electric drive system based on the efficiency of the electric drive system of the vehicle under various set working conditions. The efficiency of the electric drive system under the conditions of different environments, different electric quantities, different loads and the like of various set working conditions is fully fused, the use of the vehicle by a user is more intuitively reflected, and the accuracy of a test result of the comprehensive efficiency of the electric drive system is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle testing, and particularly relates to a method, device, equipment and storage medium for testing the efficiency of an electric drive system. Background Art

[0002] With new energy vehicles showing increasingly obvious advantages in terms of power performance, economy, comfort, etc., electric vehicles have been widely promoted and applied. However, the poor pure electric driving range of electric vehicles is one of the most complained problems by users. Therefore, driving more miles with lower power consumption will directly improve the travel experience of users. The key factor affecting the driving range of electric vehicles is the comprehensive efficiency of the electric drive system, specifically referring to the comprehensive efficiency that the electric drive system of the vehicle can achieve during the entire process from the vehicle being fully charged and consuming power until it cannot run. The higher the comprehensive efficiency, the better the driving range of the whole vehicle. Therefore, reasonably and accurately testing the comprehensive efficiency of the electric drive system has important reference value for improving the driving range of electric vehicles.

[0003] The efficiency in the electric vehicle parameters marked by major manufacturers is the highest efficiency of the electric drive system and is not universal. In related technologies, the comprehensive efficiency of electric vehicles has not been reasonably and effectively evaluated. Summary of the Invention

[0004] In view of this, the present invention provides a method, device, equipment and storage medium for testing the efficiency of an electric drive system to solve the problem that the comprehensive efficiency of electric vehicles cannot be reasonably and effectively evaluated in related technologies.

[0005] In a first aspect, the present invention provides a method for testing the efficiency of an electric drive system, the method comprising:

[0006] Detecting the operation data of the electric drive system during the process of the vehicle running from the first state to the second state in each set working condition with a set power consumption mode, wherein the ratio of the first electric quantity of the vehicle in the first state to the battery capacity of the vehicle's power battery is greater than the first percentage, the ratio of the second electric quantity of the vehicle in the second state to the battery capacity of the vehicle's power battery is less than the second percentage, and the operation data includes the input voltage of the electric drive system, the first current of the positive electrode of the input end, the second current of the negative electrode of the input end, the drive shaft torque and the drive shaft speed;

[0007] Calculating the efficiency of the electric drive system of the vehicle in each set working condition according to the operation data;

[0008] Determining the comprehensive efficiency of the electric drive system based on the efficiency of the electric drive system of the vehicle in multiple set working conditions.

[0009] The method for testing the efficiency of the electric drive system of the present invention detects the operating data of the electric drive system during the process of the vehicle running from the first state to the second state in a set power consumption mode under various set working conditions, and calculates the efficiency of the electric drive system of the vehicle under each set working condition based on the detected operating data, so as to determine the comprehensive efficiency of the electric drive system based on the electric drive system efficiencies under various working conditions. It fully integrates the electric drive system efficiencies of the electric drive system under different environments, different battery levels, different loads, etc. in various set working conditions, obtains the comprehensive efficiency of the electric drive system, can more intuitively reflect the user's use of the vehicle, quickly identify the parameter optimization space of the electric drive system under a certain working condition, significantly improve the accuracy of the test results of the comprehensive efficiency of the electric drive system, and provide a higher reference value for the evaluation and improvement of the efficiency of the electric drive system.

[0010] In some alternative embodiments, detecting the operating data of the electric drive system during the process of the vehicle running from the first state to the second state in a set power consumption mode under each set working condition includes:

[0011] Placing the vehicle in the first state under the set working condition and waiting for the first target time;

[0012] Controlling the vehicle to run with target parameters corresponding to the set working condition until the vehicle reaches the second state;

[0013] During the running process of the vehicle, continuously detect the running data of the vehicle.

[0014] The method for testing the efficiency of the electric drive system of the present invention places the vehicle in the first state under the set working condition and waits for the first target time, effectively ensuring that the operating environment of the vehicle is the environment of the set working condition and ensuring the referability of the test results. Further, controlling the vehicle to run with target parameters corresponding to the set working condition until the vehicle reaches the second state, and continuously detecting the running data of the vehicle during the running process of the vehicle. Thus, for each set working condition, the running data of the vehicle under this working condition is actually collected, and the running data can effectively reflect the actual running state of the vehicle. Further, the efficiency of the electric drive system is calculated based on the real-time collected actual running data of the vehicle, significantly improving the accuracy of calculating the efficiency of the motor drive system.

[0015] In some alternative embodiments, controlling the vehicle to run with target parameters corresponding to the set working condition includes:

[0016] Obtaining the target parameters corresponding to the set working condition in the preset working condition standard, where the target parameters include air-conditioning parameters and vehicle speed change parameters, and the vehicle speed change parameters are used to characterize compliance with the preset working condition standard;

[0017] Starting the vehicle and running it in the set power consumption mode;

[0018] Controlling the air-conditioning of the vehicle to run with the air-conditioning parameters;

[0019] Control the vehicle to run cyclically with vehicle speed change parameters until the vehicle reaches the second state.

[0020] In some alternative embodiments, continuously detect the operating data of the vehicle, including:

[0021] Record the input voltage of the electric drive system of the vehicle, the first current at the positive input terminal, the second current at the negative input terminal, the drive shaft torque, and the drive shaft speed at a preset data acquisition frequency.

[0022] In the electric drive system efficiency test method of the present invention, the input voltage of the electric drive system of the vehicle, the first current at the positive input terminal, the second current at the negative input terminal, the drive shaft torque, and the drive shaft speed are recorded at a preset data acquisition frequency. Thus, the first current at the positive input terminal and the second current at the negative input terminal of the electric drive system are obtained simultaneously for subsequent calculation of the input energy, effectively eliminating the current measurement error and realizing real-time monitoring of whether the motor is operating normally.

[0023] In some alternative embodiments, according to the operating data, calculate the electric drive system efficiency of the vehicle under each set working condition, including:

[0024] Based on the input voltage of the electric drive system, the first current at the positive input terminal, and the second current at the negative input terminal under the set working condition, calculate the input energy of the vehicle under the set working condition;

[0025] Based on the drive shaft torque and drive shaft speed of the electric drive system under the set working condition, calculate the output energy of the vehicle under the set working condition;

[0026] Determine the ratio of the input energy to the output energy as the electric drive system efficiency of the vehicle under the set working condition.

[0027] In the electric drive system efficiency test method of the present invention, based on the actual operating data such as the input voltage of the electric drive system, the first current at the positive input terminal, the second current at the negative input terminal, the drive shaft torque, and the drive shaft speed collected in real time, calculate the electric drive system efficiency, which can effectively reflect the real-time operating state of the vehicle, significantly improve the accuracy of the electric drive system efficiency, and thus obtain a more valuable comprehensive efficiency.

[0028] In some alternative embodiments, based on the electric drive system efficiencies of the vehicle under multiple set working conditions, determine the comprehensive efficiency of the electric drive system, including:

[0029] Based on a preset weight, perform weighted averaging on multiple electric drive system efficiencies to obtain the comprehensive efficiency.

[0030] The electric drive system efficiency test method of the present invention fully integrates the electric drive system efficiency under different conditions such as different environments, different battery levels, and different loads in a variety of set working conditions, obtains the comprehensive efficiency of the electric drive system, fully reflects the user's use of the vehicle, significantly improves the accuracy of the test results of the comprehensive efficiency of the electric drive system, and has higher reference value for evaluating and improving the efficiency of the electric drive system.

[0031] In some alternative embodiments, the set working conditions include at least one of the following: normal temperature comprehensive working condition, high temperature comprehensive working condition, low temperature comprehensive working condition, extremely cold comprehensive working condition, normal temperature constant speed working condition, and normal temperature intense driving working condition.

[0032] In a second aspect, the present invention provides an electric drive system efficiency test device, which includes:

[0033] A detection module for detecting the operating data of the electric drive system during the process of the vehicle running from the first state to the second state in a set power consumption mode under each set working condition, where the ratio of the first battery level of the vehicle in the first state to the battery capacity of the vehicle's power battery is greater than the first percentage, and the ratio of the second battery level of the vehicle in the second state to the battery capacity of the vehicle's power battery is less than the second percentage. The operating data includes the input voltage of the electric drive system, the first current at the positive input terminal, the second current at the negative input terminal, the drive shaft torque, and the drive shaft speed;

[0034] A calculation module for calculating the electric drive system efficiency of the vehicle under each set working condition according to the operating data;

[0035] A determination module for determining the comprehensive efficiency of the electric drive system based on the electric drive system efficiencies of the vehicle under multiple set working conditions.

[0036] In a third aspect, the present invention provides a computer device, including: a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the electric drive system efficiency test method according to the first aspect or any corresponding embodiment thereof.

[0037] In a fourth aspect, the present invention provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions are used to cause a computer to execute the electric drive system efficiency test method according to the first aspect or any corresponding embodiment thereof.

[0038] The electric drive system efficiency test method of the present invention detects the operating data of the electric drive system during the process of a vehicle running from a first state to a second state in a set power consumption mode under various set working conditions, and calculates the electric drive system efficiency of the vehicle under each set working condition based on the detected operating data, so as to determine the comprehensive efficiency of the electric drive system based on the electric drive system efficiencies under various working conditions. It fully integrates the electric drive system efficiencies of the electric drive system under different environments, different battery levels, different loads, etc. in various set working conditions, obtains the comprehensive efficiency of the electric drive system, can more intuitively reflect the user's use of the vehicle, quickly identify the parameter optimization space of the electric drive system under a certain working condition, significantly improve the accuracy of the test results of the comprehensive efficiency of the electric drive system, and provide a higher reference value for the efficiency evaluation and improvement of the electric drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0040] Figure 1 It is a schematic flowchart of the electric drive system efficiency test method according to an embodiment of the present invention;

[0041] Figure 2 It is a schematic flowchart of another electric drive system efficiency test method according to an embodiment of the present invention;

[0042] Figure 3 It is a schematic layout diagram of vehicle configuration sensors in the electric drive system efficiency test method according to an embodiment of the present invention;

[0043] Figure 4 It is a schematic flowchart of an application example of the electric drive system efficiency test method according to an embodiment of the present invention;

[0044] Figure 5 It is a structural block diagram of the electric drive system efficiency test device according to an embodiment of the present invention;

[0045] Figure 6 It is a schematic hardware structure diagram of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] Regarding the verification of the comprehensive efficiency of the electric drive system of an electric vehicle, in the related art, the method of constructing the loss model of each electric drive system is mainly adopted to obtain the comprehensive efficiency of the electric drive system loss model. The electric drive system loss model is mainly constructed based on the electrical parameters of the electric drive system under normal working conditions and cannot simulate the efficiency of the electric drive system involved in multiple actual applications of the electric vehicle.

[0048] In view of this, the present invention provides a method, device, equipment, and storage medium for testing the efficiency of an electric drive system to solve the problem that the comprehensive efficiency of an electric vehicle cannot be reasonably and effectively evaluated in the related art.

[0049] According to an embodiment of the present invention, an embodiment of a method for testing the efficiency of an electric drive system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0050] In this embodiment, a method for testing the efficiency of an electric drive system is provided, which can be used to evaluate the comprehensive efficiency of an electric vehicle. Figure 1 is a flowchart of the method for testing the efficiency of the electric drive system according to an embodiment of the present invention, as Figure 1 shown, the process includes the following steps:

[0051] Step S101, detecting the operation data of the electric drive system during the process of the vehicle running from the first state to the second state in each set working condition with a set power consumption mode, where the ratio of the first battery level of the vehicle in the first state to the battery capacity of the vehicle's power battery is greater than the first percentage, and the ratio of the second battery level of the vehicle in the second state to the battery capacity of the vehicle's power battery is less than the second percentage. The operation data includes the input voltage of the electric drive system, the first current at the positive input terminal, the second current at the negative input terminal, the drive shaft torque, and the drive shaft speed.

[0052] In some alternative embodiments, the power consumption modes of the vehicle may include: pure electric mode, hybrid electric mode, and fuel power mode. Here, in order to analyze the efficiency of the electric drive system of the electric vehicle and improve and enhance the driving performance of the electric vehicle. Therefore, in the embodiments of the present invention, the power consumption mode is set to the pure electric mode to fully analyze the comprehensive efficiency of the electric drive system in the pure electric mode.

[0053] In some alternative embodiments, the first state and the second state are mainly used to characterize the battery power of the vehicle. Specifically, when the vehicle is in the first state, the battery power is full. Here, it can be set that the ratio of the first battery power of the vehicle in the first state to the battery capacity of the vehicle is greater than the first percentage. Since there may be certain errors in the collection and quantification of the battery power, the first percentage can be set to a reasonable value such as 99% or 100%. When the vehicle is in the second state, the battery power is too low to enable the vehicle to run normally. Theoretically, the battery power is 0 at this time. Similarly, due to certain errors in the collection and quantification of the battery power, and the vehicle cannot provide sufficient power for driving even when the battery power has not dropped to 0. Therefore, here it can be set that the ratio of the second battery power of the vehicle in the second state to the battery capacity of the vehicle is less than the second percentage, and the second percentage can be set to a reasonable value such as 5% or 3%.

[0054] In some alternative embodiments, the set driving conditions may include at least one of the following: normal temperature comprehensive driving condition, high temperature comprehensive driving condition, low temperature comprehensive driving condition, extremely cold comprehensive driving condition, normal temperature constant speed driving condition, and normal temperature intense driving condition.

[0055] In some alternative embodiments, the vehicle can be successively placed under the above-mentioned various set driving conditions for testing respectively. The order of testing for the various set driving conditions can be set according to the preparation of the experimental conditions and other actual requirements, and no specific limitation is made here.

[0056] For each set driving condition, parameters such as the ambient temperature and the target parameters of the vehicle are pre-configured. Under different conditions such as ambient temperature, the operation of the vehicle's air conditioner is different. For example, in the normal temperature driving condition, there is no need to turn on the air conditioner. In the high temperature driving condition, the air conditioner refrigeration mode needs to be turned on. In the low temperature and extremely cold driving conditions, the air conditioner heating mode needs to be turned on, especially in the extremely cold driving condition. And the air conditioner is one of the devices with relatively high power consumption in the vehicle configuration. Therefore, the air conditioner operation parameters can be used as the target parameters that need to be focused on considering under the set driving conditions to simulate the operation of the vehicle under the set driving conditions.

[0057] In some alternative embodiments, when the set working condition is the normal temperature comprehensive working condition, the vehicle can be placed in an environment where the ambient temperature is stable at 23 ± 3°C, the vehicle's air conditioner is controlled to be in the off state, and according to the set experimental working condition standard, the vehicle is controlled to cyclically execute the driving of the set experimental working condition standard under this set working condition. Among them, the set experimental working condition standard can be WLTC (Worldwide Harmonized Light Vehicles Test Cycle), that is, the global unified light vehicle test cycle, CLTC (China Light-duty Vehicle Test Cycle), or NEDC (New European Driving Cycle). Here, taking the set experimental working condition standard as CLTC as an example, the vehicle can be placed under the normal temperature comprehensive working condition, and the ambient temperature is kept stable at 23 ± 3°C. At this time, the vehicle's air conditioner is kept in the off state. Based on the standard vehicle speed requirements of CLTC, the vehicle is controlled to run at the first speed for the first time, at the second speed for the second time, and at the third speed for the third time. The specific time and vehicle speed shall be subject to the standard requirements of CLTC. The first speed, the second speed, and the third speed, etc. can be referred to as the standard vehicle speeds. When controlling the vehicle speed to run according to the standard vehicle speeds, during the actual experimental process, there may be some fluctuations in the vehicle speed, and the driving speed deviation of the vehicle can be controlled within the range of ±2 km / h of the standard vehicle speed. Here, the multiple speeds specified in the standard and the corresponding running times are called a cycle working condition. Usually, the vehicle needs to complete multiple cycle working conditions to run the vehicle from the first state to the second state, that is, during the process of the vehicle running from full charge to unable to run, multiple cycle working conditions are completed. And the running data is collected at intervals during the vehicle running process. The data collection frequency can be set according to actual needs. For example, the data collection frequency is 100 Hz, that is, 100 times per second.

[0058] For example, under the normal temperature comprehensive working condition, the pre-configured parameters such as the ambient temperature can include: the ambient temperature is stable at 23 ± 3°C, and the target parameters of the vehicle can include: the air conditioner is in the off state, driving in a cycle according to the CLTC working condition, and the driving speed deviation is controlled within the range of ±2 km / h of the standard vehicle speed.

[0059] Under the high temperature comprehensive working condition, the pre-configured parameters such as the ambient temperature can include: when the ambient temperature is stable at 38 ± 3°C, the solar radiation intensity is 850 ± 45 W / m 2 . The target parameters of the vehicle can include: the air conditioner temperature is set at 23°C in automatic gear, driving in a cycle according to the CLTC working condition, and the driving speed deviation is controlled within the range of ±2 km / h of the standard vehicle speed.

[0060] Under the low-temperature comprehensive working condition, pre-configuring parameters such as ambient temperature may include: when the ambient temperature is stable at -7 ± 3°C. The target parameters of the vehicle may include: the air-conditioning temperature is set to 22°C in automatic gear, driving in a cycle of CLTC working condition, and the driving speed deviation is controlled within the range of ±2 km / h of the standard speed.

[0061] Under the extremely cold comprehensive working condition, pre-configuring parameters such as ambient temperature may include: when the ambient temperature is stable at -20 ± 3°C. The target parameters of the vehicle may include: the air-conditioning temperature is set to 22°C in automatic gear, driving in a cycle of CLTC working condition, and the driving speed deviation is controlled within the range of ±2 km / h of the standard speed.

[0062] Under the normal-temperature constant-speed working condition, pre-configuring parameters such as ambient temperature may include: when the ambient temperature is stable at 23 ± 3°C and the air-conditioning is in the off state. The target parameters of the vehicle may include: testing at three driving speeds of 140 km / h, 120 km / h, and 100 km / h respectively, and the driving speed deviation is controlled within the range of ±2 km / h of the standard speed.

[0063] Under the normal-temperature aggressive driving working condition, pre-configuring parameters such as ambient temperature may include: when the ambient temperature is stable at 23 ± 3°C. The target parameters of the vehicle may include: the air-conditioning is in the off state, and the driving speed deviation is controlled within the range of ±2 km / h of the standard speed. Here, under the normal-temperature aggressive driving working condition, the US06 (standard for supplementary test cycle) can be used for driving in a cycle working condition.

[0064] Step S102, calculate the electric drive system efficiency of the vehicle under each set working condition according to the operation data.

[0065] In some alternative embodiments, for the operation data of each set working condition, based on the input voltage of the electric drive system, the first current at the positive input terminal, and the second current at the negative input terminal included in the operation data, the input energy of the vehicle electric drive system can be calculated. Based on the drive shaft torque and drive shaft speed included in the operation data, the output energy of the vehicle electric drive system can be calculated. Based on the input energy and output energy of the vehicle electric drive system, the electric drive system efficiency of the vehicle under each set working condition can be determined.

[0066] Thus, for the operation data of each set working condition, the electric drive system efficiency of the vehicle under this working condition can be calculated.

[0067] Step S103, determine the comprehensive efficiency of the electric drive system based on the electric drive system efficiencies of the vehicle under multiple set working conditions.

[0068] In some alternative embodiments, the electric drive system efficiencies of the vehicle under multiple set working conditions can be averaged or weighted averaged, or other applicable calculation methods can be used to obtain the comprehensive efficiency of the electric drive system.

[0069] The electric drive system efficiency test method of the present invention detects the operation data of the electric drive system during the process of the vehicle running from the first state to the second state in a set power consumption mode under various set working conditions, and calculates the efficiency of the electric drive system of the vehicle under each set working condition based on the detected operation data, so as to determine the comprehensive efficiency of the electric drive system based on the electric drive system efficiencies under various working conditions. It fully integrates the electric drive system efficiencies of the electric drive system under different environments, different battery levels, different loads, etc. in various set working conditions, obtains the comprehensive efficiency of the electric drive system, can more intuitively reflect the user's use of the vehicle, quickly identify the parameter optimization space of the electric drive system under a certain working condition, and significantly improve the reference value of the test result of the comprehensive efficiency of the electric drive system for evaluating and improving the efficiency of the electric drive system.

[0070] In this embodiment, an electric drive system efficiency test method is provided, which can be used to evaluate the comprehensive efficiency of an electric vehicle. Figure 2 It is a flowchart of another electric drive system efficiency test method according to an embodiment of the present invention, as Figure 2 shown, and this process includes the following steps:

[0071] Step S201: Detect the operation data of the electric drive system during the process of the vehicle running from the first state to the second state in a set power consumption mode under each set working condition, where the ratio of the first battery level of the vehicle in the first state to the battery capacity of the vehicle's power battery is greater than the first percentage, and the ratio of the second battery level of the vehicle in the second state to the battery capacity of the vehicle's power battery is less than the second percentage. The operation data includes the input voltage of the electric drive system, the first current at the positive pole of the input end, the second current at the negative pole of the input end, the drive shaft torque, and the drive shaft speed.

[0072] Specifically, step S201 may include:

[0073] Step S2011: Place the vehicle in the first state under the set working condition and wait for the first target time.

[0074] In some optional embodiments, the process of waiting for the first target time is the soaking process, which ensures that the vehicle is in the set working condition environment, fully and truly simulates and restores the operation of the vehicle under this set working condition, thereby significantly improving the accuracy and reference value of the electric drive system efficiency test.

[0075] Specifically, for each set working condition, a corresponding first target waiting time can be preset. For example, the first target waiting duration for the normal temperature comprehensive working condition is 6h (hours).

[0076] For example, for the normal temperature comprehensive working condition, use an AC household charging pile to fully charge the vehicle and soak the vehicle for no less than 6h at an environmental temperature of 23±3°C.

[0077] Step S2012: Control the vehicle to run with target parameters corresponding to the set driving conditions until the vehicle reaches the second state.

[0078] In some alternative embodiments, step S2012 may include:

[0079] Step a1: Obtain the target parameters corresponding to the set driving conditions in the preset driving condition standard. The target parameters include air-conditioning parameters and vehicle speed change parameters, and the vehicle speed change parameters are used to characterize compliance with the preset driving condition standard.

[0080] Specifically, the preset driving condition standard may be CLTC. For different set driving conditions in the preset driving conditions, multiple vehicle speeds are preset, and the running time of each vehicle speed is set. For details, please refer to step S101, which will not be elaborated here.

[0081] Step a2: Start the vehicle and run it in the set power consumption mode.

[0082] Step a3: Control the vehicle's air conditioner to run with the air-conditioning parameters.

[0083] Step a4: Control the vehicle to run cyclically with the vehicle speed change parameters until the vehicle reaches the second state.

[0084] For example, for the normal temperature comprehensive driving condition, after soaking the vehicle for 6 hours, the vehicle can be set to the pure electric driving mode. The vehicle starts from a fully charged state and continuously runs the CLTC cycle driving condition in the chassis dynamometer test cell. The test cell temperature is controlled within the range of 23±3°C until the vehicle cannot run and the test ends. The fully charged state mentioned here and in other descriptions of the present invention can be characterized by the ratio of the first battery charge of the vehicle in the first state to the battery capacity of the vehicle's power battery being greater than the first percentage, and the vehicle's inability to run can be characterized by the ratio of the second battery charge of the vehicle in the second state to the battery capacity of the vehicle's power battery being less than the second percentage.

[0085] Further, for the high temperature comprehensive driving condition, the vehicle can be fully charged using an AC home charging pile, soaked in an environment of 38±3°C for no less than 6 hours, the vehicle is set to the pure electric driving mode, the air conditioner temperature is set to the automatic mode at 23°C, the internal circulation and face-blowing mode, the vehicle starts from a fully charged state and continuously runs the CLTC cycle driving condition in the chassis dynamometer test cell. The test cell temperature is controlled within the range of 38±3°C, and the solar radiation intensity is 850±45W / m 2 , until the vehicle cannot run and the test ends.

[0086] For the low-temperature comprehensive working condition, the vehicle can be fully charged using an AC home charging pile, immersed in an environment of -7±3°C for no less than 12 hours, the vehicle is set to pure electric driving mode, the air conditioner temperature is set to 22°C in automatic mode, the external circulation foot-blowing mode, and the vehicle starts from a full charge and continuously drives in the chassis dynamometer test cell under the CLTC cycle condition. The test cell temperature is controlled within the range of -7±3°C until the vehicle cannot run and the test terminates.

[0087] For the extreme cold comprehensive working condition, the vehicle can be fully charged using an AC home charging pile, immersed in an environment of -20±3°C for no less than 12 hours, the vehicle is set to pure electric driving mode, the air conditioner temperature is set to 22°C in automatic mode, the external circulation foot-blowing mode, and the vehicle starts from a full charge and continuously drives in the chassis dynamometer test cell under the CLTC cycle condition. The test cell temperature is controlled within the range of -7±3°C until the vehicle cannot run and the test terminates.

[0088] For the normal temperature constant speed working condition, the vehicle can be fully charged using an AC home charging pile, immersed in an environment of 23±3°C for no less than 6 hours, the vehicle is set to pure electric driving mode, and the air conditioner is in the off state. The vehicle starts from a full charge and conducts three working conditions of 140 km / h, 120 km / h, and 100 km / h respectively in the chassis dynamometer test cell. The driving speed deviation is controlled within the range of ±2 km / h of the standard vehicle speed, and the test cell temperature is controlled within the range of 23±3°C until the vehicle cannot run and the test terminates.

[0089] For the normal temperature aggressive driving working condition, the vehicle can be fully charged using an AC home charging pile, immersed in an environment of 23±3°C for no less than 6 hours, the vehicle is set to pure electric driving mode, and the vehicle starts from a full charge and continuously drives in the chassis dynamometer test cell under the US06 cycle condition. The test cell temperature is controlled within the range of 23±3°C until the vehicle cannot run and the test terminates.

[0090] Step S2013, during the operation of the vehicle, continuously detect the operation data of the vehicle.

[0091] In some alternative embodiments, at a pre-set data acquisition frequency, record the input voltage of the electric drive system of the vehicle, the first current at the positive input terminal, the second current at the negative input terminal, the drive shaft torque, and the drive shaft speed of the vehicle to achieve continuous detection of the operation data of the vehicle.

[0092] Specifically, Figure 3 is the schematic diagram of the sensor layout of the vehicle configuration in the electric drive system efficiency test method according to the embodiment of the present invention. Refer to Figure 3, a current clamp can be respectively arranged on the positive and negative cables of the current input end of the electric drive system of the vehicle to be tested. Here, the connection lines between the positive and negative poles of the power battery 301 and the electric drive system are used to indicate the positive and negative cables of the current input end of the electric drive system 302 of the vehicle. The current clamp is used to detect the first current I1 at the positive pole of the input end of the electric drive system 302 and the second current I2 at the negative pole of the input end. A voltage sensor is installed at the input end of the electric drive system 302 to detect the input end voltage U1 of the electric drive system. A strain gauge or torque sensor is arranged on the drive shaft 303 between the electric drive system 302 and the wheel 304 to detect the drive shaft torque T1. A rotational speed sensor is arranged on the drive shaft 303 to detect the drive shaft rotational speed R1. In the embodiment of the present invention, the drive shaft and the driving shaft are the same component of the vehicle.

[0093] Since Figure 3 is a schematic diagram of the sensor arrangement of the vehicle configuration, Figure 3 only the approximate positions of the current clamp, voltage sensor, strain gauge or torque sensor, and rotational speed sensor are characterized by I1, I2, U1, T1, and R1, and are not directly shown in Figure 3 the positions of the sensor arrangements such as the current clamp, voltage sensor, strain gauge or torque sensor, and rotational speed sensor.

[0094] Based on the above sensors such as the current clamp, voltage sensor, strain gauge or torque sensor, and rotational speed sensor, under any set working condition, the input end voltage U1, the first current I1 at the positive pole of the input end, the second current I2 at the negative pole of the input end, the drive shaft torque T1, and the drive shaft rotational speed R1 of the electric drive system of the vehicle can be continuously recorded at a frequency not lower than 100 Hz during the process from pure electric driving to the vehicle being unable to run.

[0095] In the electric drive system efficiency test method of the present invention, the input end voltage, the first current at the positive pole of the input end, the second current at the negative pole of the input end, the drive shaft torque, and the drive shaft rotational speed of the electric drive system of the vehicle are recorded at a preset data acquisition frequency. Thus, the first current at the positive pole of the input end and the second current at the negative pole of the input end of the electric drive system are obtained simultaneously for the subsequent calculation of the input energy, effectively eliminating the current measurement error and realizing the real-time monitoring of whether the motor is operating normally.

[0096] The efficiency test method of the electric drive system of the present invention places the vehicle in the first state under a set working condition and waits for the first target time, effectively ensuring that the operating environment of the vehicle is the environment of the set working condition and ensuring the referenceability of the test results. Further, the vehicle is controlled to operate with target parameters corresponding to the set working condition until the vehicle reaches the second state. During the operation of the vehicle, the operation data of the vehicle is continuously detected. Thus, for each set working condition, the operation data of the vehicle under this working condition is actually collected, and the operation data can effectively reflect the actual operation state of the vehicle. Further, based on the actually collected operation data of the vehicle in real time, the efficiency of the electric drive system is calculated, significantly improving the accuracy of the efficiency calculation of the motor drive system.

[0097] Step S202: Calculate the efficiency of the electric drive system of the vehicle under each set working condition according to the operation data.

[0098] Specifically, step S202 may include:

[0099] Step S2021: Calculate the input energy of the vehicle under the set working condition based on the input voltage at the input end of the electric drive system, the first current at the positive electrode of the input end, and the second current at the negative electrode of the input end under the set working condition.

[0100] Specifically, the following formula (1) can be used to calculate the input energy of the vehicle under the set working condition:

[0101]

[0102] Among them, Q1 represents the input energy of the vehicle under the set working condition;

[0103] U 1k represents the input voltage at the input end of the electric drive system of the vehicle under the set working condition;

[0104] I 1k represents the first current at the positive electrode of the input end of the electric drive system of the vehicle under the set working condition;

[0105] I 2k represents the second current at the negative electrode of the input end of the electric drive system of the vehicle under the set working condition;

[0106] k ∈ [1, n], n is a positive integer, and n is used to represent the number of the first currents, the number of the second currents, or the number of the values of the input voltage collected during the process of the vehicle running from the first state to the second state.

[0107] Step S2022: Calculate the output energy of the vehicle under the set working condition based on the driving shaft torque and the driving shaft speed of the electric drive system under the set working condition.

[0108] Specifically, the following formula (2) can be used to calculate the output energy of the vehicle under the set working condition.

[0109]

[0110] Among them, Q2 represents the output energy of the vehicle under the set working conditions;

[0111] T 1k represents the torque of the drive shaft of the electric drive system when the vehicle is under the set working conditions;

[0112] R 1k represents the rotational speed of the drive shaft of the electric drive system when the vehicle is under the set working conditions;

[0113] k ∈ [1, n], where n is a positive integer, and n is used to represent the number of values of the torque of the drive shaft of the electric drive system or the number of values of the rotational speed of the drive shaft of the electric drive system collected during the process of the vehicle running from the first state to the second state.

[0114] Step S2023: Determine the efficiency of the electric drive system of the vehicle by taking the ratio of the input energy to the output energy under the set working conditions.

[0115] Specifically, the following formula (3) can be used to calculate the efficiency of the electric drive system of the vehicle under the set working conditions.

[0116] η = Q1 * 100% / Q2 (3)

[0117] Among them, η represents the efficiency of the electric drive system of the vehicle under the set working conditions;

[0118] Q1 represents the input energy of the vehicle under the set working conditions;

[0119] Q2 represents the output energy of the vehicle under the set working conditions.

[0120] The method for testing the efficiency of the electric drive system of the present invention calculates the efficiency of the electric drive system based on the actual operating data such as the input voltage of the electric drive system, the first current at the positive input terminal, the second current at the negative input terminal, the drive shaft torque, and the drive shaft rotational speed collected in real time, can effectively reflect the real-time operating state of the vehicle, significantly improve the accuracy of the efficiency of the electric drive system, and thus obtain a more valuable comprehensive efficiency.

[0121] Step S203: Determine the comprehensive efficiency of the electric drive system based on the efficiencies of the electric drive system under multiple set working conditions.

[0122] In some alternative embodiments, the comprehensive efficiency can be obtained by weighted averaging multiple electric drive system efficiencies based on a preset weight, thereby implementing the above step S203.

[0123] Specifically, the following formula (4) can be used to calculate the efficiency of the electric drive system of the vehicle under the set working conditions.

[0124] η 综= η1 * B1 + η2 * B2 + η3 * B3 …… η x * B x (4)

[0125] where η1, η2 …… η x represent the electric drive system efficiency of the vehicle under the set working conditions, x represents the number of set working conditions. For example, in the embodiments of the present invention, 6 set working conditions including normal temperature comprehensive working condition, high temperature comprehensive working condition, low temperature comprehensive working condition, extremely cold comprehensive working condition, normal temperature constant speed working condition and normal temperature intense driving working condition are configured, then x takes the value of 6;

[0126] B1, B2, B3 …… Bx represent the contribution weight coefficients of the electric drive system efficiency of the vehicle under the corresponding set working conditions to the comprehensive efficiency.

[0127] For example, among the normal temperature comprehensive working condition, high temperature comprehensive working condition, low temperature comprehensive working condition, extremely cold comprehensive working condition, normal temperature constant speed working condition and normal temperature intense driving working condition, the contribution weight coefficients of the electric drive system efficiency to the comprehensive efficiency are shown in Table 1 below:

[0128] Table 1 Contribution weight coefficients of the electric drive system efficiency under each set working condition to the comprehensive efficiency

[0129]

[0130] Then: the comprehensive efficiency η of the vehicle electric drive system 综 can be calculated by the following formula (5):

[0131] η 综 = η1 * 25% + η2 * 20% + η3 * 20% + η4 * 15% + η5 * 15% + η6 * 5% (5)

[0132] The meanings of the parameters in formula (5) refer to the above formula (4) and Table 1.

[0133] The electric drive system efficiency test method of the present invention fully integrates the electric drive system efficiency of the electric drive system under different environments, different battery levels, different loads and other conditions in a variety of set working conditions, obtains the comprehensive efficiency of the electric drive system, fully reflects the user's use of the vehicle, significantly improves the accuracy of the test results of the comprehensive efficiency of the electric drive system, and has higher reference value for evaluating and improving the efficiency of the electric drive system.

[0134] In this embodiment, an electric drive system efficiency test method is provided, which can be used in a laboratory to test the comprehensive efficiency of the electric drive system of an electric vehicle. Figure 4 It is a schematic flow chart of a specific application example of the electric drive system efficiency test method according to the embodiments of the present invention. As Figure 4 shown, the process includes the following steps:

[0135] Step S401, contribution weight coefficient of the electric drive system efficiency to the comprehensive efficiency.

[0136] Step S402, test of the electric drive system efficiency under various set working conditions.

[0137] In some alternative embodiments, step S402 may include:

[0138] Step S4021, test of the electric drive system efficiency under normal temperature comprehensive working conditions.

[0139] Step S4022, test of the electric drive system efficiency under high temperature comprehensive working conditions.

[0140] Step S4023, test of the electric drive system efficiency under low temperature comprehensive working conditions.

[0141] Step S4024, test of the electric drive system efficiency under extremely cold comprehensive working conditions.

[0142] Step S4025, test of the electric drive system efficiency under normal temperature constant speed working conditions.

[0143] Step S4026, test of the electric drive system efficiency under normal temperature intense driving working conditions.

[0144] Step S4031, calculate the electric drive system efficiency under normal temperature comprehensive working conditions.

[0145] Step S4032, calculate the electric drive system efficiency under high temperature comprehensive working conditions.

[0146] Step S4033, calculate the electric drive system efficiency under low temperature comprehensive working conditions.

[0147] Step S4034, calculate the electric drive system efficiency under extremely cold comprehensive working conditions.

[0148] Step S4035, calculate the electric drive system efficiency under normal temperature constant speed working conditions.

[0149] Step S4036, calculate the electric drive system efficiency under normal temperature intense driving working conditions.

[0150] Step S404, calculate the comprehensive efficiency of the vehicle's electric drive system.

[0151] Figure 4 For other implementation details of the illustrated embodiments, refer to the details of the electric drive system test method shown above Figures 1-3 and will not be elaborated here.

[0152] In this embodiment, an electric drive system efficiency test device is further provided. This device is used to implement the above-mentioned embodiments and preferred implementation manners, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0153] This embodiment provides an electric drive system efficiency test device, as Figure 5 shown, including:

[0154] A detection module 501, configured to detect the operation data of the electric drive system during the process of the vehicle running from the first state to the second state in each set working condition at a set power consumption mode, wherein the ratio of the first power of the vehicle in the first state to the battery capacity of the vehicle's power battery is greater than the first percentage, and the ratio of the second power of the vehicle in the second state to the battery capacity of the vehicle's power battery is less than the second percentage. The operation data includes the input voltage of the electric drive system, the first current at the positive electrode of the input terminal, the second current at the negative electrode of the input terminal, the drive shaft torque, and the drive shaft speed;

[0155] A calculation module 502, configured to calculate the electric drive system efficiency of the vehicle under each set working condition according to the operation data;

[0156] A determination module 503, configured to determine the comprehensive efficiency of the electric drive system based on the electric drive system efficiencies of the vehicle under multiple set working conditions.

[0157] In some optional implementation manners, the detection module 501 includes:

[0158] A working condition setting unit, configured to place the vehicle in the first state under a set working condition and wait for the first target time;

[0159] An operation control unit, configured to control the vehicle to run with target parameters corresponding to the set working condition until the vehicle reaches the second state;

[0160] A detection unit, configured to continuously detect the operation data of the vehicle during the operation of the vehicle.

[0161] In some optional implementation manners, the operation control unit includes:

[0162] An acquisition subunit, configured to acquire the target parameters corresponding to the set working condition in the preset working condition standard. The target parameters include air-conditioning parameters and vehicle speed change parameters, and the vehicle speed change parameters are used to characterize compliance with the preset working condition standard;

[0163] A start subunit, configured to start the vehicle and run in the set power consumption mode;

[0164] An air-conditioning sub-unit for controlling the air-conditioning of a vehicle to operate with air-conditioning parameters;

[0165] A cyclic operation sub-unit for controlling the vehicle to operate cyclically with vehicle speed change parameters until the vehicle reaches a second state.

[0166] In some alternative embodiments, the detection unit includes:

[0167] A recording sub-unit for recording the input voltage of the electric drive system of the vehicle, the first current at the positive input terminal, the second current at the negative input terminal, the drive shaft torque, and the drive shaft speed at a preset data acquisition frequency.

[0168] In some alternative embodiments, the calculation module 502 includes:

[0169] An input determination unit for calculating the input energy of the vehicle under a set operating condition based on the input voltage of the electric drive system, the first current at the positive input terminal, and the second current at the negative input terminal under the set operating condition;

[0170] An output determination unit for calculating the output energy of the vehicle under a set operating condition based on the drive shaft torque and the drive shaft speed of the electric drive system under the set operating condition;

[0171] A calculation unit for determining the ratio of the input energy to the output energy as the efficiency of the electric drive system of the vehicle under the set operating condition.

[0172] In some alternative embodiments, the determination module 503 includes:

[0173] A weighting unit for performing a weighted average on multiple electric drive system efficiencies based on a preset weight to obtain a comprehensive efficiency.

[0174] In some alternative embodiments, the set operating condition includes at least one of the following: normal temperature comprehensive condition, high temperature comprehensive condition, low temperature comprehensive condition, extremely cold comprehensive condition, normal temperature constant speed condition, and normal temperature intense driving condition.

[0175] The further functional descriptions of the above-mentioned respective modules and units are the same as those in the corresponding embodiments above and will not be elaborated here.

[0176] The electric drive system efficiency test device in this embodiment is presented in the form of functional units. Here, the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and a memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0177] The embodiment of the present invention further provides a computer device having the above Figure 5The electric drive system efficiency test device shown.

[0178] Please refer to Figure 6 , Figure 6 which is a schematic structural diagram of a computer device provided by an alternative embodiment of the present invention. As Figure 6 shown, the computer device includes: one or more processors 10, a memory 20, and an interface for connecting various components, including a high-speed interface and a low-speed interface. Each component communicates with each other using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed within the computer device, including instructions stored in the memory or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some alternative embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a set of blade servers, or a multi-processor system). Figure 6 In

[0179] which, one processor 10 is taken as an example.

[0180] The processor 10 can be a central processing unit, a network processor, or a combination thereof. Among them, the processor 10 can further include a hardware chip. The above hardware chip can be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The above programmable logic device can be a complex programmable logic device, a field programmable gate array, a generic array logic, or any combination thereof.

[0181] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiments.

[0182] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, a hard disk, or a solid state drive; the memory 20 may further include a combination of the above types of memory.

[0183] The computer device further includes a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0184] An embodiment of the present invention further provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or be implemented as computer code that can be recorded on a storage medium, or be implemented by downloading through a network and originally stored in a remote storage medium or a non-transitory machine-readable storage medium and will be stored in a local storage medium, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Wherein, the storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid state drive, etc.; further, the storage medium may further include a combination of the above types of memory. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code, and when the software or computer code is accessed and executed by the computer, the processor, or the hardware, the method shown in the above embodiment is implemented.

[0185] A part of the present invention can be applied as a computer program product, such as computer program instructions, which when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should be able to understand that the forms of existence of computer program instructions in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways for computer program instructions to be executed by a computer include, but are not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Herein, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to the computer.

[0186] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for testing the efficiency of an electric drive system, characterized in that, The method includes: Detecting the operating data of the electric drive system during the process of the vehicle running from the first state to the second state in a set power consumption mode under each set working condition, where the ratio of the first battery level of the vehicle in the first state to the battery capacity of the vehicle's power battery is greater than the first percentage, and the ratio of the second battery level of the vehicle in the second state to the battery capacity of the vehicle's power battery is less than the second percentage. The operating data includes the input voltage of the electric drive system, the first current at the positive input terminal, the second current at the negative input terminal, the drive shaft torque, and the drive shaft speed; Calculating the efficiency of the electric drive system of the vehicle under each set working condition according to the operating data; Determining the comprehensive efficiency of the electric drive system based on the efficiencies of the electric drive system of the vehicle under multiple set working conditions.

2. The method according to claim 1, characterized in that, The detecting the operating data of the electric drive system during the process of the vehicle running from the first state to the second state in a set power consumption mode under each set working condition includes: Placing the vehicle in the first state under a set working condition and waiting for the first target time; Controlling the vehicle to run with target parameters corresponding to the set working condition until the vehicle reaches the second state; During the running process of the vehicle, continuously detecting the running data of the vehicle.

3. The method according to claim 2, wherein The controlling the vehicle to run with target parameters corresponding to the set working condition includes: Obtaining the target parameters corresponding to the set working condition in the preset working condition standard. The target parameters include air conditioner parameters and vehicle speed change parameters, and the vehicle speed change parameters are used to characterize compliance with the preset working condition standard; Starting the vehicle and running it in a set power consumption mode; Controlling the air conditioner of the vehicle to run with the air conditioner parameters; Controlling the vehicle to run cyclically with the vehicle speed change parameters until the vehicle reaches the second state.

4. The method according to claim 2, characterized in that, The continuously detecting the running data of the vehicle includes: Recording the input voltage of the electric drive system of the vehicle, the first current at the positive input terminal, the second current at the negative input terminal, the drive shaft torque, and the drive shaft speed at a preset data acquisition frequency.

5. The method according to claim 1, characterized in that, The calculating the efficiency of the electric drive system of the vehicle under each set working condition according to the operating data includes: Calculating the input energy of the vehicle under the set working condition based on the input voltage of the electric drive system, the first current at the positive input terminal, and the second current at the negative input terminal under the set working condition; Calculating the output energy of the vehicle under the set working condition based on the drive shaft torque and the drive shaft speed of the electric drive system under the set working condition; Determining the ratio of the input energy to the output energy as the efficiency of the electric drive system of the vehicle under the set working condition.

6. The method according to claim 1, wherein The determining the comprehensive efficiency of the electric drive system based on the efficiencies of the electric drive system of the vehicle under multiple set working conditions includes: Performing weighted averaging on multiple efficiencies of the electric drive system based on a preset weight to obtain the comprehensive efficiency.

7. The method according to any one of claims 1 to 6, characterized in that The set working condition includes at least one of the following: normal temperature comprehensive working condition, high temperature comprehensive working condition, low temperature comprehensive working condition, extremely cold comprehensive working condition, normal temperature constant speed working condition, and normal temperature intense driving working condition.

8. An electric drive system efficiency test device, characterized in that, The device includes: A detection module, configured to detect the operation data of the electric drive system during the process of the vehicle running from the first state to the second state in each set working condition at a set power consumption mode, wherein the ratio of the first battery level of the vehicle in the first state to the battery capacity of the vehicle's power battery is greater than a first percentage, and the ratio of the second battery level of the vehicle in the second state to the battery capacity of the vehicle's power battery is less than a second percentage, and the operation data includes the input voltage of the electric drive system, the first current at the positive pole of the input end, the second current at the negative pole of the input end, the drive shaft torque, and the drive shaft speed; A calculation module, configured to calculate the efficiency of the electric drive system of the vehicle in each set working condition according to the operation data; A determination module, configured to determine the comprehensive efficiency of the electric drive system based on the efficiencies of the electric drive system of the vehicle in multiple set working conditions.

9. A computer device, characterized in that, Comprising: A memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to execute the electric drive system efficiency test method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, Computer instructions are stored on the computer-readable storage medium, and the computer instructions are used to cause a computer to execute the electric drive system efficiency test method according to any one of claims 1 to 7.

Images