Durability testing method and apparatus for dual-motor hybrid transmission

Abstract

This invention discloses a method and apparatus for durability testing of a dual-motor hybrid transmission, applied in a transmission testing system. The transmission testing system includes a transmission control module, a test controller, and a test bench, all communicatively connected to the transmission control module. The method includes: acquiring target speed and wheel-side torque of the dual-motor hybrid transmission from the transmission control module and the test controller, respectively; driving the rear motors of the dual-motor hybrid transmission to perform corresponding drive operations using the test bench based on the target speed and wheel-side torque; performing a preset cycle of gear shifting operations on the dual-motor hybrid transmission and collecting test signals to determine the durability of the dual-motor hybrid transmission based on the test signals. This invention solves the problem of high cost in existing dual-motor hybrid transmission durability testing.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a method and apparatus for testing the durability of a dual-motor hybrid transmission. Background Technology

[0002] New energy vehicles have been a market hotspot in recent years, among which hybrid vehicles have seen their market share increase year by year due to their advantages of low fuel consumption and long driving range. Among the more classic hybrid configurations in China, such as BYD DM-I and Chery Kunpeng e+, as well as hybrid configurations developed by traditional parts manufacturers like the Magna DHD series, all involve adding an electric system to the transmission section to form a hybrid platform and achieve hybrid power control.

[0003] In product development, bench testing, as the most agile verification method, is indispensable for verifying hardware and software functionality. Unlike traditional transmission assembly benches, building a hybrid transmission assembly bench requires not only the addition of a necessary battery simulator but also an additional hybrid power controller and necessary software upgrades to the testing equipment. For OEMs, resources are relatively easy to obtain. If a transmission manufacturer needs to build a corresponding functional bench, it must seek help from the OEM to provide the HCU (Hybrid Control Unit). On the other hand, transmission manufacturers generally have existing traditional transmission assembly benches; if these can be used directly for testing and verification, it will undoubtedly reduce product development cycles and costs. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method and apparatus for testing the durability of a dual-motor hybrid transmission, which aims to solve the problem of high cost in the prior art for conducting durability tests on dual-motor hybrid transmissions.

[0005] The embodiments of the present invention are implemented as follows:

[0006] A durability testing method for a dual-motor hybrid transmission is applied in a transmission testing system. The transmission testing system includes a transmission control module, a test controller and a test bench respectively communicatively connected to the transmission control module, and the method includes:

[0007] The target speed and wheel-side torque of the dual-motor hybrid transmission are obtained from the transmission control module and the test controller, respectively.

[0008] Based on the target rotational speed and the target wheel-side torque, the test bench is used to drive the rear motor of the dual-motor hybrid transmission to perform corresponding driving operations.

[0009] The dual-motor hybrid transmission is subjected to a preset cycle of gear shifting operations, and test signals are collected to determine the durability of the dual-motor hybrid transmission based on the test signals.

[0010] Furthermore, in the aforementioned durability testing method for a dual-motor hybrid transmission, the step of performing a gear shifting operation on the dual-motor hybrid transmission includes:

[0011] The test controller acquires the torque target and drives the front motor in the dual-motor hybrid transmission to perform the operation.

[0012] The dual-motor hybrid transmission is cleared of torque, and then the shift actuator of the dual-motor hybrid transmission is controlled to disengage the current gear.

[0013] Obtain the target speed adjustment, drive the front-end motor to execute, and after the speed adjustment is completed, obtain the target torque and drive the front-end motor to execute;

[0014] The dual-motor hybrid transmission is cleared of torque, and then the shift actuator of the dual-motor hybrid transmission is controlled to enter the target gear.

[0015] Furthermore, in the above-mentioned dual-motor hybrid transmission durability test method, in the steps of obtaining the target speed adjustment, driving the front-end motor to execute, and after the speed adjustment is completed, obtaining the target torque and then driving the front-end motor to execute:

[0016] The speed regulation target is:

[0017] n p1 =n 轮端 ×i 主减 ×i 档位 +n 修正 ;

[0018] Where, n 轮端 i represents the actual rotational speed at the wheel end. 主减 i is the final reduction ratio of the transmission. 档位 n represents the gear ratio of the transmission. 修正 The corrected rotational speed for the target.

[0019] Furthermore, in the above-mentioned durability testing method for a dual-motor hybrid transmission, in the step of driving the rear motors of the dual-motor hybrid transmission to perform corresponding drive operations using the test bench according to the target speed and the target wheel-side torque:

[0020] The motor's operating torque is:

[0021] T p3 =T 轮端 / i P3 ;

[0022] Among them, T 轮端 i represents the actual torque at the wheel end. p3 This refers to the speed ratio of the drive motor.

[0023] Furthermore, in the aforementioned durability testing method for a dual-motor hybrid transmission, before the step of obtaining the target speed and wheel-side torque of the dual-motor hybrid transmission from the transmission control module and the test controller respectively, the method further includes:

[0024] The dual-motor hybrid transmission is installed on the equipment mounting platform of the test bench. Calibration software is used to obtain the feedback signals of each node in the transmission test system. When it is determined that the feedback signals of each node are normal, the steps of obtaining the speed target and wheel-side torque target of the dual-motor hybrid transmission in the transmission control module and the test controller are executed respectively.

[0025] Furthermore, in the aforementioned durability testing method for a dual-motor hybrid transmission, before the step of obtaining the target speed and wheel-side torque of the dual-motor hybrid transmission from the transmission control module and the test controller respectively, the method further includes:

[0026] The calibration software is used to confirm whether the status of each actuator in the transmission test system is normal. When it is determined that the status of each actuator is normal, the steps of obtaining the speed target and wheel-side torque target of the dual-motor hybrid transmission in the transmission control module and the test controller are executed respectively.

[0027] Furthermore, in the above-mentioned durability test method for dual-motor hybrid transmissions, the test signals include at least sound signals, vibration signals, shift position signals, and one shaft speed signals.

[0028] Another objective of this invention is to provide a durability testing system for a dual-motor hybrid transmission, applied in a transmission testing system. The transmission testing system includes a transmission control module, a test controller and a test bench respectively communicatively connected to the transmission control module. The system comprises:

[0029] The acquisition module is used to acquire the target speed and wheel-side torque of the dual-motor hybrid transmission from the transmission control module and the test controller, respectively.

[0030] The drive module is used to drive the rear motor of the dual-motor hybrid gearbox to perform corresponding drive operations based on the target speed and the target wheel torque using the test bench.

[0031] The testing module is used to perform gear shifting operations on the dual-motor hybrid transmission at a preset cycle and collect test signals to determine the durability of the dual-motor hybrid transmission based on the test signals.

[0032] Furthermore, in the aforementioned dual-motor hybrid transmission durability testing system, the testing module includes:

[0033] The acquisition unit is used to acquire the torque target obtained by the test controller and drive the front motor in the dual-motor hybrid transmission to perform the operation.

[0034] The first torque clearing unit is used to clear the torque of the dual-motor hybrid transmission and then control the shift actuator of the dual-motor hybrid transmission to disengage the current gear.

[0035] The speed control unit is used to obtain the target speed, drive the front-end motor to perform the operation, and after the speed control is completed, drive the front-end motor to perform the operation after obtaining the target torque.

[0036] The second torque clearing unit is used to clear the torque of the dual-motor hybrid transmission and then control the shift actuator of the dual-motor hybrid transmission to enter the target gear.

[0037] Furthermore, in the aforementioned dual-motor hybrid transmission durability testing system, the speed control unit includes:

[0038] The speed regulation target is:

[0039] n p1 =n 轮端 ×i 主减 ×i 档位 +n 修正 ;

[0040] Where n 轮端 i represents the actual rotational speed at the wheel end. 主减 i is the final reduction ratio of the transmission. 档位 n represents the gear ratio of the transmission. 修正 The corrected rotational speed for the target.

[0041] This invention utilizes a traditional test bench, transmission control module, and test controller to control the transmission and import test parameters. Based on the acquired target speed and wheel-side torque, it drives the rear motor to perform corresponding drive operations and performs preset cycle gear shifting operations on the dual-motor hybrid transmission. This allows for the acquisition of test signals to determine the durability of the current dual-motor hybrid transmission. It rationally utilizes existing test benches and the transmission control module required by the transmission itself to achieve transmission durability testing, eliminating the need to develop additional functional test benches to accommodate hybrid transmissions. This solves the problem of high cost in existing technologies for durability testing of dual-motor hybrid transmissions. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the gearbox testing system proposed in one embodiment of the present invention;

[0043] Figure 2This is a flowchart of the durability test method for a dual-motor hybrid transmission according to the first embodiment of the present invention;

[0044] Figure 3 This is a structural block diagram of the dual-motor hybrid gearbox durability testing device in the second embodiment of the present invention.

[0045] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0046] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0047] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed types.

[0049] Please see Figure 1 The diagram below is a structural schematic of a gearbox testing system proposed in one embodiment of the present invention. All subsequent embodiments can be applied. Figure 1 The schematic diagram of the transmission testing system shown includes a transmission control module 20, a test controller 10 and a test bench 30, both of which are communicatively connected to the transmission control module.

[0050] The transmission control module 20, test controller 10, and test bench 30 are all connected via a CAN protocol network. The transmission control module 20 (TCU) is used to implement transmission, motor, and test control. For example, it includes transmission gear control for gear shifting; transmission clutch control for clutch opening and closing; transmission oil cooling control for controlling the transmission cooling oil flow; motor torque control for test torque control scenarios such as drive torque and transmission shaft clearing torque; motor speed control for speed control scenarios during testing, such as transmission shaft speed adjustment; test parameter import for inputting fixed test targets; and automatic test operation for automatic control of repetitive load conditions. Furthermore, the test parameter import function uses A2L files to define the required variable addresses and formats. The test controller 10 can be a vehicle controller, such as a vehicle controller, or an external microcontroller.

[0051] The test bench 30 includes a power system, a mounting platform, a control platform, and related safety systems. The power system receives power demand input and performs drive or load simulations. The mounting platform connects the hybrid transmission assembly under test to the bench according to engineering requirements. The control platform enables communication with all components, data acquisition, control command transmission, and human-machine interaction. A low-voltage analog power supply provides the necessary 12V voltage and power to drive the controller and low-voltage components. A high-voltage analog power supply provides the necessary voltage and power to drive the electric drive component in the hybrid power system.

[0052] It should be pointed out that, Figure 1 The structure shown does not constitute a limitation on the transmission test system. In other embodiments, the transmission test system may include fewer or more components than shown, or combine certain components, or have different component arrangements.

[0053] The following will describe in detail how to reduce the cost of durability testing for dual-motor hybrid transmissions, with reference to specific embodiments and accompanying drawings.

[0054] Example 1

[0055] Please see Figure 2 The figure shows the durability test method for a dual-motor hybrid transmission proposed in the first embodiment of the present invention, the method including steps S10 to S12.

[0056] Step S10: Obtain the target speed and wheel-side torque of the dual-motor hybrid transmission from the transmission control module and the test controller, respectively.

[0057] The tested sample is a dual-motor hybrid transmission. The transmission has one low-voltage actuator for gear shifting. It has two high-voltage motors: a front-end motor for speed regulation and series charging, and a rear-end motor for drive. In this embodiment, the test condition simulates a vehicle speed of 30 km / h with a large number of cyclic shifts between first and second gears. The test bench obtains the target speed from the transmission control module via the CAN bus. Specifically, the target speed can be set according to actual conditions; in this embodiment, the speed is 300 rpm. The test controller (MCU) obtains the target wheel torque via the CAN bus. Specifically, the target wheel torque can be set according to actual conditions; in this embodiment, the target wheel torque is 100 Nm.

[0058] In addition, in some optional embodiments of the present invention, in order to further improve the accuracy of the durability test of the dual-motor hybrid transmission, the step of obtaining the target speed and wheel-side torque of the dual-motor hybrid transmission from the transmission control module and the test controller respectively includes the following:

[0059] The dual-motor hybrid transmission is installed on the equipment mounting platform of the test bench. Calibration software is used to obtain the feedback signals of each node in the transmission test system. When it is determined that the feedback signals of each node are normal, the steps of obtaining the speed target and wheel-side torque target of the dual-motor hybrid transmission in the transmission control module and the test controller are executed respectively.

[0060] The calibration software is used to confirm whether the status of each actuator in the dual-motor hybrid transmission is normal. When it is determined that the status of each actuator is normal, the steps of obtaining the speed target and wheel-side torque target of the dual-motor hybrid transmission in the transmission control module and the test controller are executed respectively.

[0061] Specifically, after installing the dual-motor hybrid gearbox onto the mounting platform, use the tooling wiring harness to connect the TCU to the MCU, and the TCU to the test bench. After powering on, use calibration software to observe the feedback signals of each node. Normal signals indicate successful connection. The dual-motor hybrid gearbox performs self-learning, and use calibration software to confirm whether the status of each actuator of the device under test is normal. Connect the high-voltage drive to the test bench, and use calibration software to confirm whether the status of the high-voltage devices is normal.

[0062] Step S11: Based on the target rotational speed and the target wheel-side torque, the test bench is used to drive the rear motor of the dual-motor hybrid transmission to perform the corresponding drive operation.

[0063] Specifically, the test bench is used to drive the back-end motor to perform corresponding drive operations based on the obtained test parameters.

[0064] In addition, in some optional embodiments of the present invention, in order to prevent the step torque target from causing system jitter, the TCU sends the target torque in a P control mode.

[0065] The actual motor torque is

[0066] T p3 =T 轮端 / i P3 ;

[0067] Among them, T 轮端 i represents the actual torque at the wheel end. p3 This refers to the speed ratio of the drive motor.

[0068] Step S12: Perform a preset cycle of gear shifting operation on the dual-motor hybrid transmission and collect test signals to determine the durability of the dual-motor hybrid transmission based on the test signals.

[0069] The test signals include at least sound signals, vibration signals, shift position signals, and shaft speed signals. Specifically, these signals can be used to observe whether there is significant noise during the shifting process and whether there are occasional vibrations accompanying the shifting action. The actual engagement position can be analyzed through changes in speed and shift displacement curves. If the engagement position does not shift under a large number of tests, the durability of the part can be proven.

[0070] Specifically, the steps for performing gear shifting operations on the dual-motor hybrid transmission include:

[0071] The test controller is controlled to acquire the torque target and drive the front motor in the dual-motor hybrid transmission to perform the operation.

[0072] The dual-motor hybrid transmission is cleared of torque, and then the shift actuator of the dual-motor hybrid transmission is controlled to disengage the current gear.

[0073] Obtain the target speed adjustment, drive the front-end motor to execute, and after the speed adjustment is completed, obtain the target torque and drive the front-end motor to execute;

[0074] The dual-motor hybrid transmission is cleared of torque, and then the shift actuator of the dual-motor hybrid transmission is controlled to enter the target gear.

[0075] For example, the starting gear is 1st gear, the target gear is 2nd gear, the shift cycle is 6 seconds, the speed adjustment correction is 30 rpm, and the clearing torque is 1 Nm.

[0076] The timer starts counting, determining the current gear position as 1st gear and the target gear as 2nd gear; position confirmed, the MCU obtains the torque target of 1Nm and drives the front-end motor; torque clearing complete, the shift actuator disengages from the current gear; simultaneously with disengagement, the MCU obtains the speed adjustment target and drives the front-end motor; the actual speed adjustment target is...

[0077] n p1 =n 轮端 ×i 主减 ×i 档位 +n 修正 , where n 轮端 i represents the actual rotational speed at the wheel end. 主减 i is the final reduction ratio of the transmission. 档位 n represents the gear ratio of the transmission. 修正 To adjust the target rotational speed, after speed adjustment, the MCU obtains the target torque of 1 Nm and drives the front-end motor to execute; after torque clearing, the shift actuator enters the target gear; furthermore, to make the gearbox shifting smoother, the control uses the torque clearing-speed adjustment-torque clearing process described above. After 3 seconds of timing, the above steps are repeated to return to the initial gear; after 6 seconds of timing, one cycle is completed; when the number of cycles reaches the test target, the test ends.

[0078] In summary, the dual-motor hybrid transmission durability testing method in the above embodiments of the present invention utilizes a traditional test bench, transmission control module, and test controller to achieve transmission control and test parameter import control. Based on the acquired target speed and wheel-side torque, it drives the rear-end motor to perform corresponding drive operations and performs preset cycle gear shifting operations on the dual-motor hybrid transmission. This allows for the acquisition of test signals to determine the durability of the current dual-motor hybrid transmission. The method rationally utilizes existing test benches and the transmission control module required by the transmission itself to achieve transmission durability testing, eliminating the need to develop new functional test benches to accommodate hybrid transmissions. This solves the problem of high cost in existing dual-motor hybrid transmission durability testing technologies.

[0079] Example 2

[0080] Please see Figure 3 The image shows a dual-motor hybrid transmission durability testing device proposed in the second embodiment of the present invention, applied in a transmission testing system. The transmission testing system includes a transmission control module, a test controller and a test bench respectively communicatively connected to the transmission control module, and the device includes:

[0081] The acquisition module 100 is used to acquire the target speed and wheel-side torque of the dual-motor hybrid transmission from the transmission control module and the test controller, respectively.

[0082] The drive module 200 is used to drive the rear motor of the dual-motor hybrid gearbox to perform corresponding drive operations based on the target speed and the target wheel torque using the test bench.

[0083] The test module 300 is used to perform a preset cycle of gear shifting operations on the dual-motor hybrid transmission and collect test signals to determine the durability of the dual-motor hybrid transmission based on the test signals.

[0084] Furthermore, in some optional embodiments of the present invention, the testing module includes:

[0085] The acquisition unit is used to acquire the torque target obtained by the test controller and drive the front motor in the dual-motor hybrid transmission to perform the operation.

[0086] The first torque clearing unit is used to clear the torque of the dual-motor hybrid transmission and then control the shift actuator of the dual-motor hybrid transmission to disengage the current gear.

[0087] The speed control unit is used to obtain the target speed, drive the front-end motor to perform the operation, and after the speed control is completed, drive the front-end motor to perform the operation after obtaining the target torque.

[0088] The second torque clearing unit is used to clear the torque of the dual-motor hybrid transmission and then control the shift actuator of the dual-motor hybrid transmission to enter the target gear.

[0089] Furthermore, in some optional embodiments of the present invention, wherein the speed regulating unit includes:

[0090] The speed regulation target is:

[0091] n p1 =n 轮端 ×i 主减 ×i 档位 +n 修正 ;

[0092] Where, n 轮端 i represents the actual rotational speed at the wheel end. 主减 i is the final reduction ratio of the transmission. 档位 n represents the gear ratio of the transmission. 修正 The corrected rotational speed for the target.

[0093] Furthermore, in some optional embodiments of the present invention, the driving module includes:

[0094] The motor's operating torque is:

[0095] T p3 =T 轮端 / i P3;

[0096] Among them, T 轮端 i represents the actual torque at the wheel end. p3 This refers to the speed ratio of the drive motor.

[0097] Furthermore, the aforementioned dual-motor hybrid transmission durability testing device further includes:

[0098] The signal testing module is used to install the dual-motor hybrid transmission onto the equipment mounting platform of the test bench, use calibration software to obtain the feedback signals of each node in the transmission test system, and when it is determined that the feedback signals of each node are normal, execute the steps in the transmission control module and the test controller to obtain the speed target and wheel-side torque target of the dual-motor hybrid transmission respectively.

[0099] Furthermore, the aforementioned dual-motor hybrid transmission durability testing device further includes:

[0100] The actuator testing module is used to use calibration software to confirm whether the status of each actuator in the transmission test system is normal, and when it is determined that the status of each actuator is normal, it executes the steps in the transmission control module and the test controller to obtain the speed target and wheel torque target of the dual-motor hybrid transmission respectively.

[0101] Furthermore, in the aforementioned dual-motor hybrid transmission durability testing device, the testing module includes:

[0102] The test signals include at least sound signals, vibration signals, gear shift position signals, and shaft speed signals.

[0103] The functions or operation steps implemented by the above modules are largely the same as those in the above method embodiments, and will not be repeated here.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] Those skilled in the art will understand that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any storage medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "storage medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0106] More specific examples of storage media (a non-exhaustive list) include: electrical connections (electronic devices) with one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, the storage medium can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0107] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0108] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0109] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A durability testing method for a dual-motor hybrid transmission, characterized in that, The method, applied in a transmission testing system, includes a transmission control module, a test controller and a test bench respectively communicatively connected to the transmission control module, and comprises: The target speed and wheel-side torque of the dual-motor hybrid transmission are obtained from the transmission control module and the test controller, respectively. Based on the target rotational speed and the target wheel-side torque, the test bench is used to drive the rear motor of the dual-motor hybrid transmission to perform corresponding driving operations. Perform a preset cycle of gear shifting operations on the dual-motor hybrid transmission and collect test signals to determine the durability of the dual-motor hybrid transmission based on the test signals. The steps for performing a gear shifting operation on the dual-motor hybrid transmission include: The test controller acquires the torque target and drives the front motor in the dual-motor hybrid transmission to perform the operation. The dual-motor hybrid transmission is cleared of torque, and then the shift actuator of the dual-motor hybrid transmission is controlled to disengage the current gear. Obtain the target speed adjustment, drive the front-end motor to execute, and after the speed adjustment is completed, obtain the target torque and drive the front-end motor to execute, wherein: The speed adjustment target is: ； in, This refers to the actual rotational speed at the wheel end. The final drive ratio of the gearbox. For gearbox gear ratios, The corrected rotational speed for the target; The dual-motor hybrid transmission is cleared of torque, and then the shift actuator of the dual-motor hybrid transmission is controlled to enter the target gear.

2. The durability testing method for a dual-motor hybrid transmission according to claim 1, characterized in that, In the step of using the test bench to drive the rear motor of the dual-motor hybrid transmission to perform corresponding drive operations based on the target speed and the target wheel torque: The motor's operating torque is: ； in, This represents the actual torque at the wheel end. This refers to the speed ratio of the drive motor.

3. The durability testing method for a dual-motor hybrid transmission according to claim 1, characterized in that, Before the step of obtaining the target speed and wheel-side torque of the dual-motor hybrid transmission from the transmission control module and the test controller respectively, the following steps are included: The dual-motor hybrid transmission is installed on the equipment mounting platform of the test bench. Calibration software is used to obtain the feedback signals of each node in the transmission test system. When it is determined that the feedback signals of each node are normal, the steps of obtaining the speed target and wheel-side torque target of the dual-motor hybrid transmission in the transmission control module and the test controller are executed respectively.

4. The durability testing method for a dual-motor hybrid transmission according to claim 1, characterized in that, Before the step of obtaining the target speed and wheel-side torque of the dual-motor hybrid transmission from the transmission control module and the test controller respectively, the following steps are included: The calibration software is used to confirm whether the status of each actuator in the transmission test system is normal. When it is determined that the status of each actuator is normal, the steps of obtaining the speed target and wheel-side torque target of the dual-motor hybrid transmission in the transmission control module and the test controller are executed respectively.

5. The durability test method for a dual-motor hybrid transmission according to any one of claims 1 to 4, characterized in that, The test signals include at least sound signals, vibration signals, gear shift position signals, and shaft speed signals.

6. A durability testing device for a dual-motor hybrid transmission, characterized in that, The device is used in a transmission testing system, which includes a transmission control module, a test controller and a test bench that are communicatively connected to the transmission control module. The device includes: The acquisition module is used to acquire the target speed and wheel-side torque of the dual-motor hybrid transmission from the transmission control module and the test controller, respectively. The drive module is used to drive the rear motor of the dual-motor hybrid gearbox to perform corresponding drive operations based on the target speed and the target wheel torque using the test bench. The testing module is used to perform a preset cycle of gear shifting operations on the dual-motor hybrid transmission and collect test signals to determine the durability of the dual-motor hybrid transmission based on the test signals. The acquisition unit is used to acquire the torque target obtained by the test controller and drive the front motor in the dual-motor hybrid transmission to perform the operation. The first torque clearing unit is used to clear the torque of the dual-motor hybrid transmission and then control the shift actuator of the dual-motor hybrid transmission to disengage the current gear. A speed control unit is used to acquire the target speed, drive the front-end motor to execute, and, after the speed control is completed, acquire the target torque and then drive the front-end motor to execute, wherein: The speed adjustment target is: ； in, This refers to the actual rotational speed at the wheel end. The final drive ratio of the gearbox. For gearbox gear ratios, The corrected rotational speed for the target; The second torque clearing unit is used to clear the torque of the dual-motor hybrid transmission and then control the shift actuator of the dual-motor hybrid transmission to enter the target gear.

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