A hybrid vehicle transmission system strength test method
By simulating various extreme driving conditions, the problem of strength verification of the hybrid vehicle transmission system under extreme conditions was solved, ensuring the reliability and durability of the system in harsh environments and avoiding safety hazards caused by structural failure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHERY AUTOMOBILE CO LTD
- Filing Date
- 2024-11-14
- Publication Date
- 2026-07-10
AI Technical Summary
Existing technologies cannot effectively simulate the structural strength of hybrid vehicle transmission systems under extreme driving conditions, leading to potential failures and safety hazards.
A method for testing the strength of a hybrid vehicle transmission system is provided, including various cyclic tests such as straight-line acceleration, left-turn acceleration, right-turn acceleration, figure-eight maneuver, hill start, hill climbing, hill reversing, and asphalt road acceleration, simulating the most severe user scenarios to verify the reliability and durability of the transmission system.
By employing detailed testing methods, design deficiencies in critical components of the transmission system are exposed, ensuring that no failures occur under extreme conditions and improving the reliability and durability of the transmission system.
Smart Images
Figure CN119714921B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vehicle testing, specifically to a method for testing the strength of a hybrid vehicle transmission system. Background Technology
[0002] With the continuous development of automotive technology, the ways to provide driving power for vehicles have also become more diversified. Currently, hybrid vehicles are driven by a series or parallel connection between an engine and an electric motor. Due to the high speed and large output torque of the electric motor, the strength requirements for the transmission system are also very high. Currently, transmission system component testing mainly relies on two aspects: one is the comprehensive vehicle testing conducted by the automaker itself, and the other is the bench durability testing conducted by the transmission system supplier. The combined testing of these two methods can verify the fatigue life and durability performance of the transmission system, generally meeting the design and development requirements of transmission system prototypes. However, because the strength verification of transmission system components is limited to simulation testing, it cannot simulate the structural strength of transmission system components under various extreme driving conditions. Once a critical component of the transmission system fails due to structural strength failure, it will cause the vehicle to break down, and in severe cases, lead to a vehicle safety accident.
[0003] Therefore, it is necessary to develop a standardized testing method to test the strength of the transmission system of hybrid vehicles. Summary of the Invention
[0004] The purpose of this invention is to provide a method for testing the strength of a hybrid vehicle transmission system, in order to solve the problems mentioned in the background art.
[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for testing the strength of a hybrid vehicle transmission system, 1. including the preparation steps: turning off the driving assistance system and selecting HEV / sport mode for driving mode;
[0006] Drive shaft testing procedures: Conduct linear acceleration cycle test, left-turn acceleration cycle test, and right-turn acceleration cycle test;
[0007] After completing the drive shaft test steps, check whether there is any functional damage to the key components of the transmission system and whether the critical torque attenuation is up to standard.
[0008] Differential test procedure: Conduct left turn cycle test, right turn cycle test, and figure-eight test;
[0009] After completing the differential test steps, check whether there is any functional damage to the key components of the transmission system and whether the critical torque attenuation is up to standard.
[0010] Standard ramp and acceleration tests: Conduct ramp start-up tests, ramp climbing tests, ramp reversing tests, and asphalt pavement acceleration tests;
[0011] After completing the standard ramp and acceleration tests, check whether there is any functional damage to the key components of the transmission system and whether the critical torque attenuation is up to standard.
[0012] Preferably, the vehicle is kept fully loaded during both the driveshaft test and the differential test;
[0013] Standard ramp and acceleration tests, with the vehicle undergoing tests under both half-load and full-load conditions simultaneously.
[0014] Preferably, the straight-line acceleration cycle test includes the following steps: straighten the wheels, put the vehicle in D gear, accelerate from a stationary state to more than 80km / h with the throttle opening at 100%, and perform the cycle operation.
[0015] The left-turn acceleration cycle test includes the following steps: turn the wheel fully to the left, engage D gear, accelerate from a standstill with 100% throttle opening to more than 30km / h, and perform the cycle operation.
[0016] The right-turn acceleration cycle test includes the following steps: turn the wheel fully to the right, engage D gear, accelerate from a standstill with the throttle open at 100% to over 30km / h, and perform the cycle operation.
[0017] Preferably, 4. The left-turn cycle test includes the following steps: engage D gear, start the vehicle, accelerate along a circular path with 100% throttle opening until understeer, then release the accelerator pedal, decelerate to a stop, and repeat the cycle.
[0018] The right turn cycle test includes the following steps: Engage D gear, start the vehicle, accelerate along a circular path with a radius of 10m at 100% throttle opening until understeer, then release the accelerator pedal and decelerate to a stop, repeating the cycle.
[0019] The figure-eight test includes the following steps: set up a first circular path and a second circular path that intersect, put the vehicle in D gear, and drive along the first circular path to the intersection of the first circular path and the second circular path.
[0020] Then turn left with maximum acceleration, drive along the semi-second circular path, drive to the deceleration point of the second circular path with the throttle opening at 100%, release the accelerator pedal and decelerate, turn left and continue driving along the second circular path;
[0021] After driving to the intersection of the first and second circular paths again, turn right with maximum acceleration and drive along the first circular path. Drive to the deceleration point of the first circular path with the throttle open at 100%. Release the accelerator pedal and decelerate. Completing the above steps constitutes one small cycle. Perform the cycle operation.
[0022] Preferably, it also includes a high-low contact test: including a four-wheel forward pass test, in D gear, driving at low speed on a friction surface, when it is close to the high-low contact boundary line, accelerating with full throttle to pass the boundary line, and then releasing the accelerator pedal to decelerate to a stop, and repeating the operation.
[0023] The test involves moving forward with one wheel on one side, engaging D gear, and having both wheels on one side rub against the road surface at a low speed. When the vehicle approaches the boundary line between high and low ground, the vehicle accelerates with full throttle to pass through the boundary line with both wheels on one side. Then, the accelerator pedal is released to decelerate to a stop. This process is repeated.
[0024] After passing the four-wheel reverse test, engage R gear and drive at a low speed on the friction surface. When you get close to the high and low boundary line, accelerate all four wheels through the boundary line, then release the accelerator pedal to decelerate to a stop. Repeat this operation.
[0025] After reversing and passing the test with one wheel, engage R gear and drive at a low speed on the friction surface. When you get close to the high and low friction boundary line, accelerate with full throttle to pass both wheels on one side through the boundary line. Then release the accelerator pedal to decelerate to a stop and repeat the operation.
[0026] Preferably, the hill start test includes the following steps: the vehicle is stopped at the bottom of the hill, then driven to the middle of the hill in D gear, the foot brake is applied to stop the vehicle, and the vehicle is made to stop completely without rolling back. The user is then simulated to start smoothly, and finally the vehicle is accelerated to the top of the hill at full throttle. This process is repeated several times.
[0027] The hill climbing test includes the following steps: the vehicle is stopped at the bottom of the hill, then driven to the middle of the hill in D gear, the foot brake is applied to stop the vehicle, and the vehicle is made to stop completely and without rolling back. The user is then simulated to start smoothly, and finally the vehicle is accelerated to the top of the hill at full throttle. This process is repeated several times.
[0028] The hill-start test includes the following steps: the vehicle is stopped at the bottom of the hill, then puts the vehicle in reverse gear and drives to the middle of the hill. The vehicle is stopped by foot brake and the vehicle is made to stop completely. If the vehicle does not roll back down the hill, the user is simulated to start smoothly. Finally, the vehicle is accelerated to the top of the hill by full throttle. This process is repeated several times.
[0029] Once the above four cycles are completed, it constitutes one large cycle, and a total of 20 large cycles are carried out.
[0030] Preferably, the ramp start test is conducted on a ramp with a slope of 14% to 16% and a ramp with a slope of 18% to 20%, the ramp climb test is conducted on a ramp with a slope of 30%, and the ramp downhill test is conducted on a ramp with a slope of 20%.
[0031] Preferably, the accelerated testing of asphalt pavement includes:
[0032] Forward acceleration test: Shift into D gear, apply foot brake, throttle opening 100%, then release brake pedal and accelerate to over 130km / h at full throttle.
[0033] Reverse acceleration test: Shift into reverse gear, apply the foot brake, open the accelerator to 100%, then release the brake pedal and accelerate to the maximum speed at full throttle. Repeat this cycle several times.
[0034] Preferably, the preparation steps also include:
[0035] Vehicle model selection: Select the model with the largest full load weight, and choose the combination of tires / rims with the largest inertia;
[0036] Vehicle status confirmation: Whether the components closely related to the transmission system and chassis components meet the design specifications;
[0037] Does the tire cold start pressure meet the vehicle's technical specifications?
[0038] Does the vehicle's four-wheel alignment parameter meet the technical requirements?
[0039] Preferably, professional personnel conduct subjective evaluations before and after the test. The subjective evaluation items include the noise when the vehicle is stationary; the vehicle's performance when turning, making a U-turn, braking, and driving straight; the noise when the vehicle is turning at full speed; the clutch performance; the vibration during driving; and the vibration and noise at each gear.
[0040] Compared with the prior art, the beneficial effects of the present invention are:
[0041] This invention provides a method for testing the strength of a hybrid vehicle's transmission system. It can test the ability of key components of the transmission system to resist impact damage when they reach a predetermined working state, revealing design deficiencies in these components and allowing for adjustments and avoidance during the vehicle development stage. It also simulates the most severe user scenarios to verify the reliability and durability of the transmission system, ensuring that the vehicle will not fail under extreme conditions. Attached Figure Description
[0042] Figure 1 Transmission system strength test flowchart;
[0043] Figure 2 Subjective evaluation form for transmission system strength test;
[0044] Figure 3 Vehicle loading method;
[0045] Figure 4 Schematic diagram of drive shaft test;
[0046] Figure 5 Schematic diagram of differential test;
[0047] Figure 6 Schematic diagram of high-low adhesion docking test;
[0048] Figure 7 Schematic diagram of standard ramp start test. Detailed Implementation
[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0050] Please refer to the figure. This embodiment provides a method for testing the strength of a hybrid vehicle's transmission system. The transmission system strength test requires that the test be conducted according to the test procedure, as detailed in the appendix. Figure 1 Subjective evaluations were conducted by professionals before and after the test; detailed evaluation forms are attached. Figure 2 .
[0051] The transmission test mainly verifies the hybrid gearbox, clutch, flywheel, motor, and drive shaft. Before the test, the vehicle must be fully loaded; see Appendix 3 for specific loading methods. Driver assistance systems must be disabled, and the driving mode must be HEV / sport. ① Straight-line cycle: With the vehicle in D gear, accelerate from a standstill to over 80 km / h with 100% throttle opening, repeating several cycles. See Appendix 3 for specific operating methods. Figure 4 ② Left-turn cycle: Turn the wheel fully to the left, shift into D gear, and accelerate from a standstill to over 30 km / h with the throttle open at 100%. Repeat this cycle several times. For detailed operating instructions, please refer to [link to instructions]. Figure 4 ③ Right Turn Cycle: Turn the wheel fully to the right, shift into D gear, and accelerate from a standstill to over 30 km / h with the throttle open at 100%. Repeat this cycle several times. For detailed operating instructions, please refer to [link to instructions]. Figure 4 ④ The completion of the above 3 cycles constitutes one large cycle, and a total of 3 large cycles are carried out; ⑤ After each large cycle is completed, the upper hoist is inspected to ensure that the critical components of the transmission system are not damaged and that the critical torque attenuation does not exceed the technical requirements.
[0052] The differential test primarily verifies the hybrid gearbox, differential, motor, and drive shaft. The test load requirement is full load; specific loading methods are detailed in the appendix. Figure 3The driver assistance system must be turned off, and the driving mode should be selected as HEV / sport mode. ① Left Turn Cycle: Engage D gear, start the vehicle, and accelerate along a circle with a radius of 10m at 100% throttle opening until the steering angle is severely understeerable. Suddenly release the accelerator pedal to decelerate to a stop. Repeat this cycle several times. For detailed operation instructions, please refer to [link to instructions]. Figure 5 ② Right Turn Cycle: Engage D gear, start the vehicle, accelerate along a circle with a radius of 10m at 100% throttle opening until the steering angle is severely understeerable, then suddenly release the accelerator pedal to decelerate to a stop. Repeat this cycle several times. For detailed operating instructions, please refer to [link to instructions]. Figure 5 ③ Figure-Eight Test: Engage Drive (D) and drive along the first circular path with a radius of 9m to the intersection of the first and second circular paths. Then, accelerate to the intersection at maximum speed (preferably 30km / h) and turn left. Continue along the second circular path with a radius of 9m, maintaining 100% throttle, until the deceleration point of the second circular path. Release the accelerator pedal and decelerate to an appropriate speed. Continue driving along the second circular path until the intersection of the first and second circular paths. Then, accelerate to the intersection at maximum speed (preferably 30km / h) and turn right. Continue along the first circular path with a radius of 9m, maintaining 100% throttle, until the deceleration point of the first circular path. Release the accelerator pedal and decelerate to an appropriate speed. Completing these steps constitutes one small cycle. Several cycles are performed. For detailed instructions, please refer to [link to instructions]. Figure 5 ④ The completion of the above 3 cycles constitutes one large cycle, and a total of 100 large cycles are carried out. ⑤ During the test, monitor the transmission oil temperature, which should be between 80℃ and 120℃. ⑥ After every 10 large cycles, check the transmission system on a lift to ensure that there is no functional damage to the critical components and that the critical torque attenuation does not exceed the technical requirements.
[0053] The high-low coupling test verifies the hybrid gearbox, differential, motor, and drive shaft. The test load requirement is full load; specific loading methods are detailed in the appendix. Figure 3 The driver assistance system must be turned off, and the driving mode should be selected as HEV / sport mode. ① Perform a four-wheel drive test. Engage D gear and drive at 20 km / h on a road surface with a traction system of u≈0.15. When you reach a distance of approximately 10 meters from the high / low traction dividing line, accelerate to full throttle and drive all four wheels across the dividing line. Then release the accelerator pedal and decelerate to a stop. Repeat this cycle several times. For detailed operation instructions, please refer to [link / reference needed]. Figure 6 ② For the single-wheel forward test, engage D gear and drive on a surface with a friction coefficient u≈0.15 on both wheels of one side at a speed of approximately 20 km / h. When you reach a distance of about 10 meters from the boundary between high and low traction, accelerate to full throttle and drive both wheels of one side across the boundary. Then release the accelerator pedal and decelerate to a stop. Repeat this cycle several times. For detailed operation instructions, see [link to specific instructions]. Figure 6③ Reverse four-wheel pass test: Engage R gear, and on a surface with a friction coefficient u≈0.15, drive at approximately 20 km / h. When you are about 10 meters away from the high / low traction boundary line, accelerate to full throttle to pass all four wheels through the boundary line. Then release the accelerator pedal and decelerate to a stop. Repeat this cycle several times. For detailed operation instructions, see [link to specific instructions]. Figure 6 ④ Reverse with one wheel through the road: Engage reverse gear and drive at approximately 20 km / h on a surface with a friction coefficient u≈0.15. When you are about 10 meters away from the boundary line between high and low traction, accelerate to full throttle and have both wheels on one side pass the boundary line. Then release the accelerator pedal and decelerate to a stop. Repeat this cycle several times. For detailed operation instructions, please refer to [link to specific instructions]. Figure 6 ⑤ The completion of the above 4 cycles constitutes one large cycle, and a total of 10 large cycles are performed. ⑥ After every 5 large cycles, the transmission system's critical components are inspected on the lift to ensure there is no functional damage, and the critical torque attenuation does not exceed the technical requirements. No abnormal noises are required during operation.
[0054] The standard ramp and acceleration tests primarily verify the hybrid gearbox and motor. The test load is divided into two forms: half-load and full-load. For details on the loading methods, please refer to the appendix. Figure 3 The driver assistance system must be turned off, and the driving mode should be selected as HEV / sport mode. ① 14%~16% Hill Start: Stop the vehicle at the bottom of the hill, then engage D gear and drive to the middle of the hill. Apply the foot brake to stop, ensuring the vehicle is completely stationary and not rolling back. Simulate a smooth start using the user's input method. Finally, accelerate to the top of the hill at full throttle. Repeat this cycle several times. See details for specific operation. Figure 7 ② 18%–20% Hill Start: Stop the vehicle at the bottom of the hill, then engage Drive (D) and drive to the middle of the hill. Apply the foot brake to stop, ensuring the vehicle is completely stationary and not rolling back. Simulate a smooth start using the user's technique. Finally, accelerate to the top of the hill at full throttle. Repeat this cycle several times. See details for specific instructions. Figure 7 ③ Climbing the steepest slope (30% slope recommended): Stop the vehicle at the bottom of the slope, then engage D gear and drive to the middle of the slope. Apply the foot brake to stop, ensuring the vehicle is completely stationary and not rolling back. Simulate a smooth start, as if using a user. Finally, accelerate to the top of the slope at full throttle. Repeat this cycle several times. See details for specific instructions. Figure 7 ④ Maximum gradient ramp reverse (20% gradient recommended): Stop the vehicle at the bottom of the ramp, then shift into reverse (R) and drive to the middle of the ramp. Apply the foot brake to stop, ensuring the vehicle is completely stationary and not rolling back. Simulate a smooth start, as if using a user. Finally, accelerate to the top of the ramp at full throttle. Repeat this cycle several times. See details for specific instructions. Figure 7⑤ The completion of the above 4 cycles constitutes one large cycle, and a total of 20 large cycles are performed. ⑥ Asphalt road forward acceleration test: Shift into D gear, apply the foot brake, throttle opening 100%, then release the brake pedal and accelerate at full throttle to over 130 km / h, repeating several cycles. ⑦ Asphalt road reverse acceleration test: Shift into R gear, apply the foot brake, throttle opening 100%, then release the brake pedal and accelerate at full throttle to maximum speed, repeating several cycles. ⑧ After the test, inspect the transmission system on a lift to ensure that there is no functional damage to critical components and that the critical torque attenuation does not exceed the technical requirements.
[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A method for testing the strength of a hybrid vehicle transmission system, characterized in that: Preparation steps include: turning off the driver assistance system and selecting HEV / sport mode for driving; Drive shaft testing procedures: Conduct linear acceleration cycle test, left-turn acceleration cycle test, and right-turn acceleration cycle test; After completing the drive shaft test steps, check whether there is any functional damage to the key components of the transmission system and whether the critical torque attenuation is up to standard. Differential test procedure: Conduct left turn cycle test, right turn cycle test, and figure-eight test; After completing the differential test steps, check whether there is any functional damage to the key components of the transmission system and whether the critical torque attenuation is up to standard. Standard ramp and acceleration tests: Conduct ramp start-up tests, ramp climbing tests, ramp reversing tests, and asphalt pavement acceleration tests; After completing the standard ramp and acceleration tests, check whether there is any functional damage to the key components of the transmission system and whether the critical torque attenuation is up to standard. The vehicle was kept fully loaded during both the driveshaft and differential tests. Standard ramp and acceleration tests, with the vehicle undergoing tests under both half-load and full-load conditions simultaneously.
2. The method for testing the strength of a hybrid vehicle transmission system according to claim 1, characterized in that: The straight-line acceleration cycle test includes the following steps: straighten the wheels, put the vehicle in D gear, accelerate from a stationary state to more than 80km / h with the throttle opening at 100%, and perform the cycle operation. The left-turn acceleration cycle test includes the following steps: turn the wheel fully to the left, engage D gear, accelerate from a standstill to more than 30km / h with 100% throttle opening, and perform the cycle operation. The right-turn acceleration cycle test includes the following steps: turn the wheel fully to the right, engage D gear, accelerate from a standstill to over 30km / h with 100% throttle opening, and perform the cycle operation.
3. The method for testing the strength of a hybrid vehicle transmission system according to claim 1, characterized in that: The left-turn cycle test includes the following steps: Engage D gear, start the vehicle, accelerate along a circular path with 100% throttle opening until understeer, then release the accelerator pedal, decelerate to a stop, and repeat the cycle. The right turn cycle test includes the following steps: Engage D gear, start the vehicle, accelerate along a circular path with a radius of 10m at 100% throttle opening until understeer, then release the accelerator pedal and decelerate to a stop, repeating the cycle. The figure-eight test includes the following steps: set up a first circular path and a second circular path that intersect, put the vehicle in D gear, and drive along the first circular path to the intersection of the first circular path and the second circular path. Then turn left with maximum acceleration, drive along the semi-second circular path, drive to the deceleration point of the second circular path with the throttle opening at 100%, release the accelerator pedal and decelerate, turn left and continue driving along the second circular path; After driving to the intersection of the first and second circular paths again, turn right with maximum acceleration and drive along the first circular path. Drive to the deceleration point of the first circular path with the throttle open at 100%. Release the accelerator pedal and decelerate. Completing the above steps constitutes one small cycle. Perform the cycle operation.
4. The method for testing the strength of a hybrid vehicle transmission system according to claim 1, characterized in that: It also includes a high-low boundary test: including a four-wheel forward pass test, with the gear in D, driving at low speed on a friction surface, and when it gets close to the high-low boundary line, accelerating at full throttle to pass the boundary line with all four wheels, and then releasing the accelerator pedal to decelerate to a stop, and repeating the operation. The test involves moving forward with one wheel on one side, engaging D gear, and having both wheels on one side rub against the road surface at a low speed. When the vehicle approaches the boundary line between high and low ground, the vehicle accelerates with full throttle to pass through the boundary line with both wheels on one side. Then, the accelerator pedal is released to decelerate to a stop. This process is repeated. After passing the four-wheel reverse test, engage R gear and drive at a low speed on the friction surface. When you get close to the high and low boundary line, accelerate all four wheels through the boundary line, then release the accelerator pedal to decelerate to a stop. Repeat this operation. After reversing and passing the test with one wheel, engage R gear and drive at a low speed on the friction surface. When you get close to the high and low friction boundary line, accelerate with full throttle to pass both wheels on one side through the boundary line. Then release the accelerator pedal to decelerate to a stop and repeat the operation.
5. The method for testing the strength of a hybrid vehicle transmission system according to claim 1, characterized in that: The hill start test includes the following steps: the vehicle is stopped at the bottom of the hill, then driven to the middle of the hill in D gear, the foot brake is applied to stop the vehicle, and the vehicle is made to stop completely without rolling back. The user is then simulated to start smoothly, and finally the vehicle is accelerated to the top of the hill at full throttle. This process is repeated several times. The hill climbing test includes the following steps: the vehicle is stopped at the bottom of the hill, then driven to the middle of the hill in D gear, the foot brake is applied to stop the vehicle, and the vehicle is made to stop completely and without rolling back. The user is then simulated to start smoothly, and finally the vehicle is accelerated to the top of the hill at full throttle. This process is repeated several times. The hill-start test includes the following steps: the vehicle is stopped at the bottom of the hill, then puts the vehicle in reverse gear and drives to the middle of the hill. The vehicle is stopped by foot brake and the vehicle is made to stop completely. If the vehicle does not roll back down the hill, the user is simulated to start smoothly. Finally, the vehicle is accelerated to the top of the hill by full throttle. This process is repeated several times. Once the above three ramp test steps are completed, it constitutes one large cycle, and a total of 20 large cycles are carried out.
6. The method for testing the strength of a hybrid vehicle transmission system according to claim 5, characterized in that: The ramp start test is conducted on ramps with a slope of 14% to 16% and a slope of 18% to 20%, the ramp climb test is conducted on a ramp with a slope of 30%, and the ramp downhill test is conducted on a ramp with a slope of 20%.
7. The method for testing the strength of a hybrid vehicle transmission system according to claim 1, characterized in that: Asphalt pavement acceleration tests include: Forward acceleration test: Shift into D gear, apply foot brake, throttle opening 100%, then release brake pedal and accelerate to over 130km / h at full throttle. Reverse acceleration test: Shift into reverse gear, apply the foot brake, open the accelerator to 100%, then release the brake pedal and accelerate to the maximum speed at full throttle. Repeat this cycle several times.
8. The method for testing the strength of a hybrid vehicle transmission system according to claim 1, characterized in that: The preparation steps also include: Vehicle model selection: Select the model with the largest full load weight, and choose the combination of tires / rims with the largest inertia; Vehicle status confirmation: Whether the components closely related to the transmission system and chassis components meet the design specifications; Does the tire cold start pressure meet the vehicle's technical specifications? Does the vehicle's four-wheel alignment parameter meet the technical requirements? 9. The method for testing the strength of a hybrid vehicle transmission system according to claim 8, characterized in that: Before and after the test, professional personnel conducted subjective evaluations. The subjective evaluation items included noise when the vehicle was stationary; the vehicle's performance when turning, making a U-turn, braking, and driving straight; noise when the vehicle was turning at full speed; clutch performance; vibration during driving; and vibration and noise in each gear.