Endurance test device, system and test method for new energy power assembly

Abstract

The invention belongs to the technical field of electric vehicle testing, and discloses an endurance test device, system and test method for a new energy power assembly, which are used for an endurance test of the new energy power assembly consisting of an electric drive gearbox and a drive axle. Comprising a test bench, a power energy simulation control device, a resistance simulation loading device, a sensor assembly, a vibration analyzer, a bearing pedestal and a cooling device. The endurance test working condition is formulated according to the real vehicle road spectrum, the first motor and the second motor are controlled to move under different gears, and the endurance test of the electric drive axle is realized by monitoring the drive axle output rotating speed, the drive axle output torque, the motor output rotating speed, the motor output torque, vibration data and the like fed back by the electric drive axle under stable operation. Durability test verification under various working conditions is realized; the test method is high in reliability and high in stability, effective data support is provided for vehicle development, possible failure modes of the power assembly are checked in the test stage, early and reliable fault early warning is achieved, and the product quality is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric vehicle testing, and particularly relates to a durability test device, system and test method for a new energy power assembly. BACKGROUND

[0002] The electric drive gearbox has the characteristics of high integration, low energy consumption and high economy, and is the core power of new energy commercial vehicles and has been widely used in new energy vehicles. The reliability performance of the electric drive gearbox is a key link of the quality competitiveness of the vehicle. At present, the market mainly carries out separate durability tests on the electric drive gearbox and the drive axle, which cannot fully verify the reliability and stability of the power assembly composed of the electric drive gearbox and the drive axle, there may be failure modes that have not been ruled out, early fault warning cannot be realized, and the improvement of product quality is affected. SUMMARY

[0003] The purpose of the application is to provide a durability test device, system and test method for a new energy power assembly, which is used for the durability test of a new energy power assembly composed of an electric drive gearbox and a drive axle, formulates the working conditions of the durability test according to the real vehicle road spectrum of the vehicle, controls the movement of the first motor and the second motor at different gears, monitors the drive axle output speed, drive axle output torque, motor output speed, motor output torque and vibration data and the like fed back by the electric drive axle under stable operation, and realizes the durability test bench verification of the new energy power assembly under various road spectrum working conditions. The test method of the application has high reliability and strong stability, can provide effective data support for vehicle product development, rules out the possible failure modes of the power assembly in the bench test stage, realizes early and high-reliability fault warning, and improves product quality.

[0004] The specific scheme content is as follows:

[0005] A durability test device for a new energy power assembly, comprising: a test bench, a power energy simulation control device, a resistance simulation loading device, a sensor assembly, a vibration analyzer, a bearing seat and a cooling device, the power energy simulation control device, the resistance simulation loading device, the sensor assembly, the vibration analyzer, the bearing seat and the cooling device are all arranged on the test bench, and the power energy simulation control device and the resistance simulation loading device are electrically connected with the test bench, the sensor assembly and the cooling device are electrically connected to the corresponding positions of the power energy simulation control device, the tested piece includes an electric drive gearbox and a drive axle, which are arranged on the test bench, and the bearing seat is connected between the electric drive gearbox and the drive axle, the bearing seat is used for monitoring the output torque and the output speed of the electric drive gearbox, the electric drive gearbox is electrically connected with the power energy simulation control device, the left and right wheel ends of the drive axle are respectively drivingly connected with the resistance simulation loading device, and the vibration analyzer is respectively connected to the electric drive gearbox and the drive axle.

[0006] The durability test device of the energy power assembly of the application is arranged on the test bench, the battery simulator and the gear controller of the power energy simulation control equipment are electrically connected to the test bench, the first dynamometer and the second dynamometer of the resistance simulation loading equipment are respectively electrically connected to the test bench, the electric drive gearbox to be tested is installed on the test bench before testing, and the electric drive gearbox is electrically connected to the shift controller, the first motor and the second motor. The test bench system inputs various parameters of the preset working condition before testing, and calls the parameters of the corresponding working condition during testing. Low-voltage signals are sent to the battery simulator, the gear controller, the first dynamometer and the second dynamometer to make them perform durability test according to the preset working condition. The first motor sensor and the second motor sensor of the sensor assembly are respectively connected to the first motor and the second motor for real-time monitoring of the output torque and the output speed of the first motor and the second motor. The rotational speed and torque sensor in the bearing seat is used to measure the output torque and the output speed of the output end of the electric drive gearbox. The vibration analyzer includes a plurality of signal sensors, which are connected to the electric drive gearbox and the drive axle in a manner of magnetic attraction, adhesion, etc. for real-time monitoring of the vibration frequency spectrum change of the electric drive gearbox and the drive axle, and early and efficient fault warning is realized. The first dynamometer and the second dynamometer receive the test bench instruction, and according to the parameters of the rolling resistance, air resistance, slope resistance and acceleration resistance input by the test bench, the output target speed of the left and right wheel ends of the drive axle is simulated to simulate different resistance conditions encountered during actual vehicle driving, and the output torque and the output speed of the left and right wheel ends of the drive axle are obtained through the sensors inside the first dynamometer and the second dynamometer. During the test process, the test bench system automatically records various data, providing detailed data for subsequent analysis and research of the failed electric gearbox and drive axle under test.

[0007] Further, the power energy simulation control equipment includes: a battery simulator, a motor controller, a first motor, a second motor and a gear controller, the battery simulator is connected to the motor controller, the motor controller is connected to the first motor and the second motor, the first motor and the second motor are respectively connected to the electric drive gearbox, the gear controller is electrically connected to the electric drive gearbox and arranged on the electric drive gearbox, and the test bench is electrically connected to the battery simulator and the gear controller.

[0008] The battery simulator and the gear controller are connected to the test bench through CAN communication. During the durability test, the test bench system sends instruction information to the battery simulator and the gear controller. The battery simulator provides working voltage and current for the motor controller; the motor controller sends a target torque or target speed instruction request to the motor. The gear controller is electrically connected to the motor controller, and the gear controller is used to receive the shift instruction request sent by the test bench system, switch the gear of the electric drive gearbox, and send a signal instruction to the motor for speed regulation.

[0009] Further, the sensor assembly comprises a first motor sensor and a second motor sensor, the first motor sensor and the second motor sensor are respectively connected to the first motor and the second motor, and are used to measure the output speed and the output torque of the first motor and the second motor.

[0010] Further, the resistance simulation loading device comprises a first dynamometer and a second dynamometer, both of which comprise a road resistance simulation function module, the first dynamometer and the second dynamometer are respectively connected to the left wheel end and the right wheel end of the drive axle, and the test bench is electrically connected with the first dynamometer and the second dynamometer.

[0011] The first dynamometer and the second dynamometer are used to measure the output speed and the output torque of the left wheel end and the right wheel end of the drive axle, and simultaneously simulate the road resistance. Before the durability test, according to the formulated working condition, the rolling resistance, the air resistance, the slope resistance, the acceleration resistance and other related parameters are input in the test bench system, so that the first dynamometer and the second dynamometer can provide different resistances simulating the driving of the automobile for the wheel end of the drive axle during the durability test, and the test data obtained by the durability test has high reliability and strong stability, thereby providing effective data support for the development of the whole vehicle product.

[0012] Further, the electric drive gearbox and the drive axle are drivingly connected through a flange, a transmission shaft and a bearing seat, and the bearing seat is internally provided with a speed-torque sensor for measuring the output torque and the output speed of the electric drive gearbox.

[0013] The bearing seat is internally provided with a speed-torque sensor for real-time detection of the output torque and the output speed of the electric drive gearbox, thereby providing a powerful basis for judging the state of the electric drive gearbox and the drive axle. The first motor sensor and the second motor sensor measure the output speed and the output torque of the first motor and the second motor, and the bearing seat detects the output torque and the output speed of the electric drive gearbox, and the first dynamometer and the second dynamometer measure the output torque and the output speed of the left wheel end and the right wheel end of the drive axle. During the test process, all the data are automatically recorded by the test bench, and these data provide a basis for judging the state change of the tested electric drive gearbox and drive axle, and provide detailed and reliable basis for subsequent analysis of the failure cause of the product.

[0014] Further, the vibration analyzer comprises a plurality of signal sensors, and the vibration analyzer is connected with the electric drive gearbox and the drive axle through corresponding signal sensors.

[0015] The vibration analyzer is used to monitor the vibration frequency spectrum change of the gear pair inside the electric drive gearbox and the drive axle, thereby realizing early and high-reliability fault early warning.

[0016] Further, the cooling device comprises a water temperature control unit, the water temperature control unit is connected with the first motor and the second motor, and is used to cool the first motor and the second motor.

[0017] The water temperature control unit is used for controlling the motor cooling water temperature, and cooling the motor.

[0018] A durability test system of a new energy power assembly, comprising a test bench system, and further comprising a durability test device of the new energy power assembly, which is used for presetting and calling working condition parameters of the durability test, coordinating the durability test device, monitoring and alarming a test process in real time, automatically stopping after the test is completed, automatically collecting, storing and preliminarily analyzing test data.

[0019] The durability test system of the present application provides software support for the present application, and the test bench system is connected with the battery simulator, the gear controller, the first dynamometer and the second dynamometer of the durability test device of the present application, and sends signal instructions. The gear controller is controlled to switch the gear of the electric drive box and to adjust the speed of the motor; the battery simulator is controlled to provide working voltage and current for the motor controller, and the first motor and the second motor output target torque; the first dynamometer and the second dynamometer are controlled to measure the output speed and the output torque of the left and right wheel ends of the drive axle, and to simulate road resistance at the same time; the first dynamometer and the second dynamometer are controlled to measure the output torque and the output speed of the left and right wheel ends of the drive axle, so that the whole durability test can be successfully completed according to the formulated working condition, and the test data can be automatically recorded and preliminarily analyzed.

[0020] A durability test method of a new energy power assembly, which is tested by using the durability test system of the new energy power assembly, and the steps comprise:

[0021] S11, the electric drive gearbox and the drive axle to be tested are installed on the test bench and connected with related test equipment, and the equipment installation and connection work is completed;

[0022] S12, the working condition of the durability test is formulated according to the vehicle road spectrum, and the working condition parameters of the durability test are input in the test bench system;

[0023] S13, start the test, the test bench system sends instructions to the gear controller, battery simulator, first dynamometer and second dynamometer, starts the durability test test of the first working condition, the gear controller sends the gear switching instruction to the electric drive gearbox, the battery simulator works at the target voltage, the first dynamometer and the second dynamometer output the target speed, the first motor and the second motor output the target torque, the first dynamometer and the second dynamometer respectively obtain the output speed and output torque of the left and right wheel ends of the drive axle, the sensor assembly measures the output speed and output torque of the first motor and the second motor, the vibration analyzer measures the vibration change of the electric drive gearbox and the drive axle, the bearing seat measures the output speed and output torque of the electric drive gearbox, after this working condition is completed, the next working condition is carried out, the above operation is repeated until the vibration analyzer sends an alarm to stop or completes all test working conditions, the durability test is ended, and the test data is automatically recorded in the test bench system;

[0024] S14, disassemble and analyze the tested electric drive gearbox and drive axle, and evaluate.

[0025] Further, step S13 specifically comprises:

[0026] S1301, the test bench system sends a durability test instruction, and the gear shifting executor sends a gear switching instruction designed according to the working condition after receiving the instruction, so that the electric drive gearbox works at the target gear of the working condition;

[0027] S1302, the test bench system sends an instruction to the battery simulator, so that the battery simulator works at the target voltage of the working condition; the test bench system sends an instruction according to the simulated resistance parameter of the working condition to the first dynamometer and the second dynamometer, so that the first dynamometer outputs the first target speed and the second dynamometer outputs the second target speed; the motor controller sends an instruction of the target speed and the target torque designed according to the working condition to the first motor and the second motor, so that the first motor works at the first target speed and the first target torque designed according to the working condition, and the second motor works at the target speed and the second target torque designed according to the working condition, the first motor outputs the first target torque, and the second motor outputs the second target torque;

[0028] S1303, the output speed and output torque of the left and right wheel ends of the drive axle are respectively obtained through the first dynamometer and the second dynamometer, and the output speed and output torque of the electric drive gearbox are obtained through the speed and torque sensor of the bearing seat;

[0029] S1304, the vibration analyzer is started, the vibration change of the electric drive gearbox and the drive axle is monitored, and the test bench system automatically records the data;

[0030] S1305, the test of this working condition durability test is completed, the gear shifting actuator sends a gear switching instruction, and the next working condition durability test is carried out, the above steps are repeated until all working conditions are automatically stopped or the vibration analyzer issues an alarm to stop, and the durability test is completed.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] Unlike the current market, which mainly carries out separate durability tests on electric drive gearboxes and drive axles, the present application is used for durability tests of new energy powertrains composed of electric drive gearboxes and drive axles. The test method of the present application has high reliability and strong stability, can provide effective data support for vehicle product development, can check possible failure modes of the powertrain in the bench test stage, realize early and high-reliability fault warning, and improve product quality. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The figure is a system block diagram of the durability test of the new energy powertrain of the present application.

[0034] Figure 2 The figure is a flowchart of the durability test method of the new energy powertrain of the present application.

[0035] In the figure:

[0036] 1. battery simulator; 2. motor controller; 3. first motor; 4. second motor; 5. electric drive gearbox; 6. first motor sensor; 7. second motor sensor; 8. bearing seat; 9. drive axle; 10. first dynamometer; 11. second dynamometer; 12. water temperature control unit; 13. vibration analyzer; 14. gear controller. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] The terms used in the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Multiple" generally includes at least two.

[0039] It should be noted that the terms "front", "back", "inner", "outer", "left", "right" and the like in the present application indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0040] It should be particularly noted that the symbols and numbers present in the specification, if not marked in the description, are not the figure marks.

[0041] The embodiments provided by the present application, namely a durability test device, system and test method of a new energy power assembly, will be described in detail below in combination with Figure 1 and Figure 2 .

[0042] Embodiment 1:

[0043] See Figure 1 , a durability test device of a new energy power assembly, comprising: a test bench, a power energy simulation control device, a resistance simulation loading device, a sensor assembly, a vibration analyzer 13, a bearing seat 8 and a cooling device, the power energy simulation control device, the resistance simulation loading device, the sensor assembly, the vibration analyzer 13 device, the bearing seat 8 and the cooling device are all arranged on the test bench, and the power energy simulation control device and the resistance simulation loading device are respectively electrically connected to the test bench, the sensor assembly and the cooling device are respectively connected to the corresponding positions of the power energy simulation control device, the test piece includes an electric drive gearbox 5 and a drive axle 9, which are respectively connected to the test bench, the bearing seat 8 is connected between the electric drive gearbox 5 and the drive axle 9, the bearing seat 8 is used to monitor the output torque and output speed of the electric drive gearbox 5, the electric drive gearbox 5 is connected with the power energy simulation control device, the left and right wheel ends of the drive axle 9 are respectively connected with the resistance simulation loading device, and the vibration analyzer 13 is respectively connected to the electric drive gearbox 5 and the drive axle 9.

[0044] The power energy simulation control device comprises: a battery simulator 1, a motor controller 2, a first motor 3, a second motor 4 and a gear controller 14, the battery simulator 1 is connected with the motor controller 2, the motor controller 2 is connected with the first motor 3 and the second motor 4, the first motor 3 and the second motor 4 are respectively connected with the electric drive gearbox 5, the gear controller 14 is connected with the electric drive gearbox 5, and the test bench is electrically connected with the battery simulator 1 and the gear controller 14.

[0045] The sensor assembly comprises a first motor sensor 6 and a second motor sensor 7, which are respectively connected to the first motor 3 and the second motor 4, and are used for measuring the output rotation speed and the output torque of the first motor 3 and the second motor 4.

[0046] The resistance simulation loading device comprises a first dynamometer 10 and a second dynamometer 11, both of which comprise a road resistance simulation function module, and the first dynamometer 10 and the second dynamometer 11 are respectively connected to the left wheel end and the right wheel end of the drive axle 9, and the test bench is electrically connected with the first dynamometer 10 and the second dynamometer 11.

[0047] The electric drive gearbox 5 and the drive axle 9 are drivingly connected through a flange, a transmission shaft and a bearing seat 8, the bearing seat 8 is internally provided with a rotation speed and torque sensor, which is used for measuring the output torque and the output rotation speed of the electric drive gearbox 5.

[0048] The vibration analyzer 13 comprises a plurality of signal sensors, and the vibration analyzer 13 is connected with the electric drive gearbox 5 and the drive axle 9 through the signal sensors.

[0049] The cooling device comprises a water temperature control unit 12, which is connected with the first motor 3 and the second motor 4, and is used for cooling the first motor 3 and the second motor 4.

[0050] Embodiment 2:

[0051] The application further provides a durability test test system of a new energy power assembly, which comprises a test bench system and the durability test device of the new energy power assembly.

[0052] Embodiment 3:

[0053] See Figure 2 The application further provides a durability test test method of a new energy power assembly, which is tested by using the durability test test system of the new energy power assembly.

[0054] S11, the electric drive gearbox 5 and the drive axle 9 to be tested are installed on the test bench and connected with related test equipment, and the equipment installation and connection work is completed;

[0055] S12, according to the vehicle real vehicle road spectrum, the working condition of the durability test is formulated, and the working condition parameters of the durability test are input in the test bench system.

[0056] S13, start the test, the test bench system sends instructions to the gear controller 14, the battery simulator 1, the first dynamometer 10 and the second dynamometer 11, the gear controller 14 sends the gear switching instruction to the electric drive gearbox 5, the battery simulator 1 works at the target voltage, the first dynamometer 10 and the second dynamometer 11 output the target speed, the first motor 3 and the second motor 4 output the target torque, the first dynamometer 10 and the second dynamometer 11 respectively obtain the output speed and the output torque of the left and right wheel ends of the drive axle 9, the sensor assembly measures the output speed and the output torque of the first motor 3 and the second motor 4, the vibration analyzer 13 measures the vibration change of the electric drive gearbox 5 and the drive axle 9, the bearing seat 8 measures the output speed and the output torque of the electric drive gearbox 5, after this working condition is completed, the next working condition is carried out, the above operation is repeated until the vibration analyzer 13 sends an alarm to stop or completes all test working conditions, the durability test is completed, and the test data is automatically recorded in the test bench system;

[0057] The step S13 specifically includes the following steps.

[0058] S1301, the test bench system sends a start durability test instruction, and the gear shifting executor sends a gear switching instruction designed according to the working condition after receiving the instruction, so that the electric drive gearbox 5 works at the target gear of the working condition;

[0059] S1302, the test bench system sends an instruction to the battery simulator 1, so that the battery simulator 1 works at the target voltage of the working condition; the test bench system sends an instruction according to the simulation resistance parameter designed according to the working condition to the first dynamometer 10 and the second dynamometer 11, so that the first dynamometer 10 outputs the first target speed and the second dynamometer 11 outputs the second target speed; the motor controller 2 sends an instruction of the target speed and the target torque designed according to the working condition to the first motor 3 and the second motor 4, so that the first motor 3 works at the first target speed and the first target torque designed according to the working condition, and the second motor 4 works at the target speed and the second target torque designed according to the working condition, the first motor 3 outputs the first target torque, and the second motor 4 outputs the second target torque;

[0060] S1303, the output speed and the output torque of the left and right wheel ends of the drive axle 9 are respectively obtained through the first dynamometer 10 and the second dynamometer 11, and the output speed and the output torque of the electric drive gearbox 5 are obtained through the speed and torque sensor of the bearing seat 8;

[0061] S1304, the vibration analyzer 13 is started, the vibration change of the electric drive gearbox 5 and the drive axle 9 is monitored, and the test bench system automatically records the data;

[0062] S1305, the test of this working condition durability test is completed, the gear shifting actuator sends a gear switching instruction, and the next working condition durability test is performed. The above steps are repeated until all working condition automatic shutdowns are completed, or the vibration analyzer 13 issues an alarm shutdown, and the durability test is completed.

[0063] S14, the tested electric drive gearbox 5 and drive axle 9 are disassembled and analyzed, and evaluated.

[0064] The above examples are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A durability testing device for a new energy powertrain, characterized in that, include: The test bench, power energy simulation control device, resistance simulation loading device, sensor assembly, vibration analyzer (13), bearing housing (8) and cooling device are all set on the test bench. The power energy simulation control device, resistance simulation loading device, sensor assembly, vibration analyzer (13), bearing housing (8) and cooling device are electrically connected to the test bench. The sensor assembly and cooling device are electrically connected to the corresponding positions of the power energy simulation control device. The test piece includes an electric drive gearbox (5) and a drive axle (9), which are set on the test bench. A bearing housing (8) is connected between the electric drive gearbox (5) and the drive axle (9). The bearing housing (8) is used to monitor the output torque and output speed of the electric drive gearbox (5). The electric drive gearbox (5) is electrically connected to the power energy simulation control device. The left and right wheel ends of the drive axle (9) are respectively connected to the resistance simulation loading device. The vibration analyzer (13) is connected to the electric drive gearbox (5) and the drive axle (9).

2. The durability testing device for new energy powertrains according to claim 1, characterized in that, The power energy simulation control device includes: a battery simulator (1), a motor controller (2), a first motor (3), a second motor (4), and a gear position controller (14). The battery simulator (1) is electrically connected to the motor controller (2). The motor controller (2) is electrically connected to the first motor (3) and the second motor (4). The first motor (3) and the second motor (4) are electrically connected to the electric drive gearbox (5). The gear position controller (14) is electrically connected to the electric drive gearbox (5) and is mounted on the electric drive gearbox (5). The test bench is electrically connected to the battery simulator (1) and the gear position controller (14).

3. The durability testing device for new energy powertrains according to claim 2, characterized in that, The sensor assembly includes a first motor sensor (6) and a second motor sensor (7). The first motor sensor (6) and the second motor sensor (7) are respectively connected to the first motor (3) and the second motor (4) to measure the output speed and output torque of the first motor (3) and the second motor (4).

4. The durability testing device for new energy powertrains according to claim 1, characterized in that, The resistance simulation loading device includes a first dynamometer (10) and a second dynamometer (11), both of which include a road resistance simulation function module. The first dynamometer (10) and the second dynamometer (11) are respectively connected to the left and right wheel ends of the drive axle (9). The test bench is electrically connected to the first dynamometer (10) and the second dynamometer (11).

5. The durability testing apparatus for a new energy powertrain according to claim 1, characterized in that, The electric drive gearbox (5) and drive axle (9) are connected by a flange, a drive shaft and a bearing housing (8). The bearing housing (8) is equipped with a speed and torque sensor to measure the output torque and output speed of the electric drive gearbox (5).

6. The durability testing apparatus for a new energy powertrain according to claim 1, characterized in that, The vibration analyzer (13) includes multiple signal sensors, and the vibration analyzer (13) is connected to the electric drive gearbox (5) and the drive axle (9) respectively through the corresponding signal sensors.

7. The durability testing apparatus for a new energy powertrain according to claim 1, characterized in that, The cooling device includes a water temperature control unit (12), which is connected to a first motor (3) and a second motor (4) for cooling the first motor (3) and the second motor (4).

8. A durability testing system for a new energy powertrain, characterized in that, It includes a test bench system and a durability testing device for new energy powertrains as described in any one of claims 1-7, used for presetting and calling up operating parameters for durability testing, coordinating the durability testing device, real-time monitoring and alarming of the test process, automatic shutdown after the test, automatic acquisition, storage and preliminary analysis of test data.

9. A durability test method for a new energy powertrain, characterized in that, The test is conducted using the durability testing system for the new energy powertrain as described in claim 8, and the steps include: S11. Install the electric drive gearbox (5) and drive axle (9) to be tested onto the test bench and connect them to the relevant test equipment to complete the equipment installation and connection work; S12. Determine the working conditions for the durability test based on the actual road profile of the whole vehicle, and input the working condition parameters for the durability test into the test bench system; S13. The test begins. The test bench system sends instructions to the gear position controller (14), battery simulator (1), first dynamometer (10), and second dynamometer (11). Upon receiving the instructions, the gear position controller (14) sends a gear shifting instruction to the electric drive gearbox (5), causing the electric drive gearbox (5) to operate at the target gear, the battery simulator (1) to operate at the target voltage, the first dynamometer (10) and the second dynamometer (11) to output the target speed, and the first motor (3) and the second motor (4) to output the target torque. The output speed and output torque of the left and right wheel ends of the drive axle (9) are obtained respectively. The sensor assembly measures the output speed and output torque of the first motor (3) and the second motor (4). The vibration analyzer (13) is turned on and measures the vibration changes of the electric drive gearbox (5) and the drive axle (9). The bearing housing (8) measures the output speed and output torque of the electric drive gearbox (5). After this working condition is completed, the next working condition is carried out. The above operation is repeated until the vibration analyzer (13) issues an alarm to stop or all test working conditions are completed. The durability test ends and the test data is automatically recorded in the test bench system. S14. Disassemble, inspect, analyze, and evaluate the tested electric drive transmission (5) and drive axle (9).

10. The durability test method for a new energy powertrain according to claim 9, characterized in that, Step S13 specifically includes: S1301, the test bench system sends a command to start the durability test, and the shift actuator sends a gear switching command for the working condition design after receiving it, so that the electric drive gearbox (5) works in the target gear of the working condition; S1302, The test bench system sends a command to the battery simulator (1) to make the battery simulator (1) work at the target voltage of the working condition; The test bench system sends a simulated resistance command to the first dynamometer (10) and the second dynamometer (11) to make the first dynamometer (10) output the first target speed and the second dynamometer (11) output the second target speed; The motor controller (2) sends a command to the first motor (3) and the second motor (4) to make the first motor (3) work at the first target speed and the first target torque of the working condition design, and the second motor (4) work at the target speed and the second target torque of the working condition design, the first motor (3) outputs the first target torque, and the second motor (4) outputs the second target torque; S1303, the output speed and output torque of the left and right wheel ends of the drive axle (9) are obtained by the first dynamometer (10) and the second dynamometer (11) respectively, and the output speed and output torque of the electric drive gearbox (5) are obtained by the speed and torque sensor of the bearing housing (8); S1304. Turn on the vibration analyzer (13) to monitor the vibration changes of the electric drive gearbox (5) and drive axle (9), and the test bench system automatically records the data. S1305. After the endurance test of this working condition is completed, the gear shifting actuator sends a gear switching command to conduct the endurance test of the next working condition. Repeat the above steps until all working conditions are completed and the machine automatically stops, or the vibration analyzer (13) issues an alarm to stop the machine, and the endurance test ends.

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