A starting condition design method and verification method for high and low temperature starting endurance verification of a p13 configuration electrically driven transmission

Abstract

This invention relates to a starting condition design method for high and low temperature start-up durability verification of a P13 configuration electric drive transmission. The method determines the proportion of CD power consumption mode and CS power retention mode; calculates the number of starts for each of the P1 generator motor and P3 motor under a single WLTC condition; calculates the total number of starts required for the P1 generator motor and P3 drive motor within the design lifecycle of the P13 configuration electric drive transmission; calculates the number of starts for the P1 generator motor and P3 drive motor under high and low temperature environments within the design lifecycle of the P13 configuration electric drive transmission; obtains the number of starts for each of the P1 generator motor and P3 drive motor under a single WLTC condition in both high and low temperature environments; and, referring to the vehicle start-stop scenario, SOC state, and series-parallel control logic of the P13 configuration electric drive transmission, finally calculates the number of high-temperature cycles M and the number of low-temperature cycles N; thus constructing the starting condition for high and low temperature start-up durability verification of the P13 configuration electric drive transmission. This invention can verify whether the P13 configuration electric drive transmission meets reliability design requirements.

Description

Technical Field

[0001] This invention relates to the field of environmental reliability testing for P13 configuration electric drive transmissions, specifically to a starting condition design method and verification method for high and low temperature start-up durability verification of P13 configuration electric drive transmissions. Background Technology

[0002] With increasingly stringent fuel consumption and emission regulations, the market share of hybrid vehicles is gradually rising. Compared to the P2 configuration electric drive transmission, the P13 configuration (P13 configuration refers to an electric drive transmission where P1 is a generator and P3 is a drive motor) has advantages in terms of cost (including cost reduction), urban fuel consumption, and resource control, making it another hybrid technology route that major companies are vigorously developing. However, OEMs lack research on the acceleration verification of P13 configuration electric drive transmissions under simulated user starting conditions in high and low temperature environments. In high-temperature environments, the oil film adhering to the gear bearings inside the transmission may be insufficient, leading to a dry and unlubricated state; in low-temperature environments, the viscosity of the lubricating oil increases, making oil stirring difficult, which may lead to poor lubrication at long distances. Frequent starts under these conditions increase the dry friction contact of the shafts and gears. Under these conditions, abnormal transmission noises and jerking are likely to occur in the market. Over time, reliability issues such as tooth surface burning, tooth surface peeling, abnormal bearing wear, and clutch erosion will become prominent, directly affecting the user's real-world driving experience and driving safety. In order to better develop the P13 configuration electric drive transmission, better suit user scenarios, verify in advance, and shorten the product development cycle, it is necessary to conduct bench simulation high and low temperature start-up durability verification research on the P13 configuration electric drive transmission at the transmission level.

[0003] Chinese patent application CN115952682A discloses a fatigue life verification test method for a P2 configuration electric drive transmission and a method for designing conversion of test conditions. This disclosed technical solution, on the one hand, corrects potential over-testing of some conditions and lack of verification of others by matching actual road spectrum load conditions; on the other hand, it accelerates the test through the principle of fatigue damage equivalence. Furthermore, the use of automated programmable scripts during condition testing avoids the possibility of test failure due to human error and improves the efficiency of condition operation. This technical solution is used to verify whether the reliability of all load-bearing components of the electric drive transmission, such as the P2 motor, gear shaft system, bearings, clutch, and housing, meets design requirements, facilitating the early detection and rectification of design and product defects to ensure project development progress. However, this disclosed technical solution is only applicable to P2 configuration electric drive transmissions and lacks design research on starting conditions for high and low temperature start-up durability verification of P13 configuration electric drive transmissions. Summary of the Invention

[0004] One objective of this invention is to provide a starting condition design method for high and low temperature start-up durability verification of P13 configuration electric drive transmission, so as to solve the problem that there is no starting condition design for high and low temperature start-up durability verification of P13 configuration electric drive transmission in the prior art. Another objective is to provide a working condition verification method for high and low temperature start-up durability verification of P13 configuration electric drive transmission, which is used to verify whether the reliability of P13 configuration electric drive transmission meets the design requirements under high and low temperature environments.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for designing start-up conditions for high and low temperature start-up durability verification of a P13 configuration electric drive transmission includes the following steps:

[0007] The vehicle's operating status is divided into CD power consumption mode and CS power retention mode;

[0008] Under WLTC operating conditions, determine the proportion of CD power consumption mode and CS power retention mode;

[0009] Calculate the number of times each of the P1 generator motor and P3 drive motor starts under a single WLTC operating condition;

[0010] Calculate the total number of times the P1 generator motor and P3 drive motor need to be started during the design life of the P13 configuration electric drive transmission;

[0011] The range and duration of high and low temperature environments were determined, and combined with the thermal damage test analysis of the P13 configuration electric drive transmission, the actual engine compartment ambient temperature data and transmission oil temperature data were obtained.

[0012] Then determine the range of high-temperature environments and their annual duration, and the range of low-temperature environments and their annual duration.

[0013] Based on the proportion of high-temperature environment in a year and the proportion of low-temperature environment in a year, the number of times the P1 generator motor and P3 drive motor are started during the design life cycle of the P13 configuration electric drive transmission under high and low temperature environments are calculated respectively.

[0014] The number of times P1 generator motor and P3 drive motor start in high and low temperature environments under a single WLTC condition is obtained. Referring to the vehicle start-stop scenario, SOC state, and the series-parallel control logic of P13 configuration electric drive transmission, the number of high temperature cycles M and the number of low temperature cycles N are finally calculated.

[0015] Based on the number of times the P1 generator motor and P3 drive motor are started under a single WLTC condition, and combined with the start-stop scenarios, SOC status, series and parallel control logic of the P13 electric drive transmission, vehicle speed, P1 generator motor speed, P1 generator motor torque, P3 drive motor speed, P3 drive motor torque, engine speed, engine torque, transmission oil temperature, and start-to-stabilization time of the whole vehicle equipped with the P13 configuration electric drive transmission, the starting conditions of the P13 configuration electric drive transmission under high and low temperature environments are constructed.

[0016] Based on the above technical means, an accurate experimental condition design can be provided for the high and low temperature start-up durability verification of the P13 configuration electric drive transmission. This design is closer to the actual use scenario and can ensure the reliability of the P1 generator motor, P3 drive motor, electric drive transmission gear shaft system, clutch, dual electronic control system, and sealing system under high and low temperature conditions.

[0017] Furthermore, the starting conditions include different gradients of P1 generator motor speed, different gradients of P1 generator motor torque, the number of times P1 generator motor is started, different gradients of P3 drive motor speed, different gradients of P3 drive motor torque, and the number of times P3 drive motor is started, based on vehicle parameters, electronic control strategy, transmission ratio, and vehicle rolling radius parameters.

[0018] Furthermore, the formulas for calculating the number of starts for each of the P1 generator motor and the P3 drive motor under a single WLTC operating condition are as follows:

[0019] R p1 =1* p1 +2* p1

[0020] R p3 =1* p3 +2* p3

[0021] Among them, R p1 R represents the number of times the P1 generator / motor starts under WLTC conditions. p3 k1 represents the number of times the P3 drive motor starts under WLTC conditions; k2 represents the percentage of WLTC conditions in CD power consumption mode; k3 represents the percentage of WLTC conditions in CS power maintenance mode; D p1 The number of times the P1 generator starts under WLTC operating conditions in CD power consumption mode; D p3 For WLTC operation, in CD power consumption mode, P3 drive motor starts

[0022] Number of movements; S p1 S represents the number of times the P1 generator / motor starts under WLTC conditions. p3 This represents the number of times the P3 drive motor starts under WLTC conditions.

[0023] Furthermore, the formula for calculating the total number of starts required for the P1 generator motor and P3 drive motor during the design life of the P13 configuration electric drive transmission is as follows:

[0024] ∑R P1 =(k1*D p1 +k2*S p1 )*L / Q

[0025] ∑R P3 =(k1*D p3 +k2*S p3 )*L / Q

[0026] Where, ∑R P1 The P13 electric drive transmission is designed to handle the number of times the P1 generator motor starts within its operating mileage; ∑R P3 L represents the number of times the P3 motor is started within the design mileage of the P13 electric drive transmission; Q represents the design mileage of the P13 electric drive transmission; and Q represents the mileage of one WLTC cycle.

[0027] Furthermore, the formula for calculating the number of times the P1 generator motor and P3 drive motor start within the design life of the P13 configuration electric drive transmission under high and low temperature environments is as follows:

[0028]

[0029]

[0030]

[0031]

[0032] in, The number of times the P1 generator motor can be started within the service mileage of the P13 electric drive transmission designed for high-temperature environments; The number of times the P1 generator motor can be started within the usage mileage of the P13 electric drive transmission under low-temperature conditions; The number of P3 drive motor starts within the usage mileage for the P13 electric drive transmission under high temperature conditions; The number of times the P3 drive motor is started within the design mileage of the P13 electric drive transmission under low temperature conditions; k3 is the percentage of time spent in high temperature conditions over one year; k4 is the percentage of time spent in low temperature conditions over one year.

[0033] Furthermore, based on the development goals of the P13 configuration vehicle, the vehicle's driving characteristics under WLTC conditions were simulated in both CD power consumption mode and CS power maintenance mode. Parameters related to vehicle speed, P1 generator speed, P1 generator torque, P3 drive motor speed, P3 drive motor torque, engine speed, engine torque, transmission oil temperature, battery SOC, and duration related to the start-up condition were extracted for both modes. Combined with big data analysis, the travel scenarios of the target user group were identified, and the proportion of the vehicle's CD power consumption mode and CS power maintenance mode was determined.

[0034] Another aspect of the present invention proposes a method for high and low temperature start-up durability verification of a P13 configuration electric drive transmission, comprising the following steps:

[0035] The P3 drive motor, transmission, clutch, and P1 generator motor are assembled to form the P13 configuration electric drive transmission assembly. The P13 configuration electric drive transmission assembly is installed in the temperature chamber on the test bench according to the vehicle condition. The input shaft of the P1 generator motor is connected to the output shaft of the test bench drive motor. The output end of the P13 configuration electric drive transmission assembly is connected to the load motor. The test bench is electrically connected to the P3 drive motor, P1 generator motor, and test bench drive motor respectively.

[0036] Maintain the temperature chamber temperature to keep the ambient temperature between 80°C and 85°C. Start the electronic oil pump to ensure lubrication requirements are met. Control the P3 motor to start and preheat, and keep the transmission oil temperature within the high-temperature operating condition requirement of 115°C to 120°C. Set the speed of the test bench drive motor to 0 and the torque of the test bench load motor to 0, and perform a start-up durability test on the P13 configuration electric drive transmission, running it through the start-up operating condition for M high-temperature cycles.

[0037] Maintain the temperature chamber temperature and the ambient temperature between -35°C and -40°C. Start the electronic oil pump to ensure lubrication requirements are met. Control the transmission oil temperature within the range of less than or equal to 10°C required for low-temperature operation. Perform N low-temperature cycle tests on the P13 configuration electric drive transmission under low-temperature start-up durability test conditions.

[0038] Furthermore, the specific starting conditions for the single high-temperature / low-temperature start-up durability test of the P13 configuration electric drive transmission are as follows:

[0039] First, control the temperature chamber temperature and keep the ambient temperature within the range of the P13 configuration electric drive transmission durability test environment temperature. Then, start the electronic oil pump to ensure that the lubrication requirements are met.

[0040] Operating Condition 1: Performing the start-stop cycle c1 of the P1 generator motor at speed n1: The test bench controls the drive motor speed to increase from 0 to N, and requests the P1 generator motor torque to increase from 0 to T over time t1. The test bench then maintains the P1 generator motor speed N and torque T for time t2, simulating the P1 generator motor driving the engine start-up process. Next, the test bench controls the P1 generator motor speed to change from N to n1, and the P1 generator motor torque to change from T to T1 over time t3. The test bench then maintains the P1 generator motor speed n1 and torque T1 for time t4, simulating the P1 generator motor generating power. Finally, the test bench controls the P1 generator motor speed to decrease to 0, and requests the P1 generator motor torque to decrease to 0.

[0041] Operating Condition 2: Perform the start-stop operation of P1 generator motor at speed n2 for 2 cycles: control and simulate the starting process of P1 generator motor driving engine as described in Operating Condition 1 above; then control the speed of P1 generator motor to change from N to n2, and the torque of P1 generator motor to change from T to T2, lasting t6, and maintain the speed of P1 generator motor n2 and the torque of P1 generator motor T2 for a time t7, simulating the power generation process of P1 generator motor; finally, the test bench controls the speed of P1 generator motor to drop to 0, and requests that the torque of P1 generator motor drop to 0.

[0042] Operating Condition 3: Perform the start-stop operation of P1 generator motor at speed n3 for 3 cycles: control and simulate the starting process of P1 generator motor driving the engine as described in Operating Condition 1 above; then control the speed of P1 generator motor to change from N to n3, and the torque of P1 generator motor to change from T to T3, lasting t9, and maintain the speed of P1 generator motor n3 and the torque of P1 generator motor T3 for a time t. 10 The test bench simulates the power generation process of P1 generator motor; finally, the test bench controls the speed of P1 generator motor to drop to 0, and requests that the torque of P1 generator motor be reduced to 0.

[0043] Operating Condition 4: Perform the start-stop cycle of P1 generator motor at speed n4 for 4 cycles: control the simulated engine start-up process driven by P1 generator motor as described in Operating Condition 1; then control the speed of P1 generator motor to change from N to n4, and the torque of P1 generator motor to change from T to T4, for a duration of t. 11 And the P1 generator speed n4 and the P1 generator torque T4 held for a time t 12 The test bench simulates the power generation process of P1 generator motor; finally, the test bench controls the speed of P1 generator motor to drop to 0, and requests that the torque of P1 generator motor be reduced to 0.

[0044] Operating Condition 5: Performing 5 cycles of start-stop operation of P3 drive motor at speed n5: The test bench, in conjunction with the PEU, controls the speed of P3 drive motor to increase from 0 to n5 and the torque of P3 drive motor to increase from 0 to T5, lasting for t seconds. 14 And the P3 drive motor speed n5, P3 drive motor torque T5 holding time t15 The test bench simulates the slow start-up process of a vehicle; finally, the test bench, in conjunction with the PEU control, reduces the speed and torque of the P3 drive motor to 0.

[0045] Operating Condition 6: Performing 6 cycles of start-stop operation of the P3 drive motor at speed n6: The test bench, in conjunction with the PEU, controls the P3 drive motor speed to increase from 0 to n6 and the P3 drive motor torque to increase from 0 to T6, lasting for t seconds. 17 And the P3 drive motor speed n6, P3 drive motor torque T6 holding time t 18 The test bench simulates the slow start-up process of a vehicle; finally, the test bench, in conjunction with the PEU control, reduces the speed and torque of the P3 drive motor to 0.

[0046] Operating Condition 7: Performing 7 cycles of start-stop operation of the P3 drive motor at speed n7: The test bench, in conjunction with the PEU, controls the P3 drive motor speed to increase from 0 to n7 and the P3 drive motor torque to increase from 0 to T7, lasting for t. 20 And the P3 drive motor speed n7, P3 drive motor torque T7 holding time t 21 The test bench simulates the slow start-up process of a vehicle; finally, the test bench, in conjunction with the PEU control, reduces the speed and torque of the P3 drive motor to 0.

[0047] Operating Condition 8: Performing 8 cycles of start-stop operation of the P3 drive motor at speed n8: The test bench, in conjunction with the PEU, controls the P3 drive motor speed to increase from 0 to n8 and the P3 drive motor torque to increase from 0 to T8, lasting t. 23 And the P3 drive motor speed n8, P3 drive motor torque T8 holding time t 24 The test bench simulates the slow start-up process of a vehicle; finally, the test bench, in conjunction with the PEU control, reduces the speed and torque of the P3 drive motor to 0.

[0048] Furthermore, the P13 configuration electric drive transmission is a single-speed electric drive transmission, wherein n1, n2, n3, and n4 increase sequentially, and n5, n6, n7, and n8 increase sequentially.

[0049] Furthermore, c1 is 2 times; c2 is 3 times; c3 is 2 times; c4 is 1 time; c5 is 3 times; c6 is 3 times; c7 is 2 times; and c8 is 1 time.

[0050] Furthermore, in the start-up and shutdown of the P1 generator, the operation is executed in the order of operation 1, operation 2, operation 3, and operation 4; in the start-up and shutdown of the P3 generator, the operation is executed in the order of operation 5, operation 6, operation 7, and operation 8.

[0051] Furthermore, after completing the start-up durability test of the P13 configuration electric drive transmission, running it under start-up conditions for M high-temperature cycles, the P13 configuration electric drive transmission is then subjected to a low-temperature start-up durability test for N low-temperature cycles.

[0052] The beneficial effects of this invention are as follows: This invention can verify the reliability of repeated starting of the P1 generator motor, repeated starting of the P3 drive motor, the gear shaft system of the electric drive transmission, the clutch, the dual electronic control system, and the sealing system under high and low temperature environments. It can verify whether the P13 configuration electric drive transmission meets reliability design requirements in the early stages of project development, enabling early detection and timely rectification of design and product defects to ensure project development progress. Attached Figure Description

[0053] Figure 1 A flowchart of one embodiment of the starting condition design method for high and low temperature start-up durability verification of P13 configuration electric drive transmission;

[0054] Figure 2 A schematic diagram of the test bench layout for the P13 configuration electric drive transmission;

[0055] Figure 3 The operating cycle diagram for the P13 configuration electric drive transmission WLTC;

[0056] Figure 4 Diagram showing the start-up test conditions for the P13 configuration electric drive transmission;

[0057] Figure 5 A flowchart for the high and low temperature start-up durability verification method of the P13 configuration electric drive transmission.

[0058] In the attached diagram: 1. P3 drive motor; 2. Gearbox; 3. Clutch; 4. P1 generator motor; 5. PEU (Dual Motor Controller); 6. P13 configuration electric drive gearbox; 7. PCU (Power Control Unit); 8. Temperature chamber; 9. Bench drive motor; 10. First half-shaft; 11. Second half-shaft; 12. Bench load motor No. 1; 13. Bench load motor No. 2; 14. Battery simulator; 15. Temperature control system; 16. Early fault prediction system; 17. Test bench. Detailed Implementation

[0059] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0060] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0061] like Figure 1 As shown, this embodiment proposes a starting condition design method for high and low temperature start-up durability verification of a P13 configuration electric drive transmission, including the following steps:

[0062] The vehicle's operating status is divided into CD power consumption mode and CS power retention mode.

[0063] Under WLTC operating conditions, determine the proportion of CD power consumption mode and CS power retention mode.

[0064] Calculate the number of times each of the P1 generator motor 4 and the P3 drive motor 1 starts under a single WLTC operating condition.

[0065] Calculate the total number of times P1 generator motor 4 and P3 drive motor 1 need to be started during the design life of the P13 configuration electric drive transmission.

[0066] By determining the temperature range and duration of high and low temperatures, and combining the thermal damage test analysis of the P13 configuration electric drive transmission, the actual engine compartment ambient temperature data and transmission oil temperature data were obtained.

[0067] Then determine the range of high-temperature environments and their annual duration, as well as the range of low-temperature environments and their annual duration.

[0068] Based on the proportion of high-temperature environment in a year and the proportion of low-temperature environment in a year, the number of times P1 generator motor 4 and P3 drive motor 1 are started during the design life cycle of P13 configuration electric drive transmission under high and low temperature environments are calculated respectively.

[0069] The number of times P1 generator motor 4 and P3 drive motor 1 started in high and low temperature environments under a single WLTC condition was obtained. Referring to the vehicle start-stop scenario, SOC state, and the series-parallel control logic of the P13 configuration electric drive transmission, the number of high temperature cycles M and the number of low temperature cycles N were finally calculated.

[0070] Based on the number of times P1 generator motor 4 and P3 drive motor 1 are started under a single WLTC condition, the number of high-temperature cycles M and the number of low-temperature cycles N are calculated. Combined with the start-stop scenarios, SOC status, series and parallel control logic of P13 electric drive transmission, vehicle speed, P1 generator motor 4 speed, P1 generator motor 4 torque, P3 drive motor 1 speed, P3 drive motor 1 torque, engine speed, engine torque, transmission 2 oil temperature and start-to-stabilization time under WLTC conditions, the starting conditions of P13 electric drive transmission under high and low temperature environments are constructed.

[0071] Based on the above technical means, an accurate experimental condition design can be provided for the high and low temperature start-up durability verification of the P13 configuration electric drive transmission. This design is closer to the actual use scenario and can ensure the reliability of repeated starts of P1 generator motor 4, P3 drive motor 1, electric drive transmission gear shaft system, clutch, dual electronic control system, and sealing system under high and low temperature conditions.

[0072] It should be noted that during the operation of the P13 hybrid vehicle, depending on the driver's power needs, battery SOC balance, and fuel economy requirements, it enters the following modes of the P13 electric drive transmission: series mode (P1 generator 4 starts to drive the engine to generate electricity, which is then distributed to P3 drive motor 1 to drive the vehicle or charge the battery); parallel mode (P1 generator 4 starts to adjust the speed to drive the engine and then engages the clutch, providing engine power and P3 drive motor 1 to jointly drive the wheels); and pure electric EV mode (P3 drive motor 1 starts to drive the vehicle alone). Based on its vehicle operating state, it is divided into two types: CD (Cycles) battery consumption mode and CS (Cycles) battery holding mode.

[0073] In this embodiment, the starting conditions include different gradients of P1 generator motor 4 speed, different gradients of P1 generator motor 4 torque, the number of times P1 generator motor 4 is started, different gradients of P3 drive motor 1 speed, different gradients of P3 drive motor 1 torque, and the number of times P3 drive motor 1 is started, based on vehicle parameters, electronic control strategy, transmission ratio, and vehicle rolling radius parameters.

[0074] In this embodiment, the formula for calculating the number of times P1 generator motor 4 and P3 drive motor 1 are started under a single WLTC operating condition is as follows:

[0075] R p1 =k1*D p1 +k2*S p1

[0076] R p3 =k1*D p3 +k2*S p3

[0077] Among them, Rp1 R represents the number of starts of generator 4 (P1) under WLTC conditions. p3 k1 represents the number of times P3 drive motor 1 starts under WLTC conditions; k2 represents the percentage of WLTC conditions in CD power consumption mode; k3 represents the percentage of WLTC conditions in CS power maintenance mode; D p1 The number of times P1 generator motor 4 starts under WLTC operating conditions in CD power consumption mode; D p3 The number of times P3 drive motor 1 starts under WLTC operating conditions in CD power consumption mode; S p1 The number of times P1 generator 4 starts under WLTC conditions; S p3 This represents the number of times motor 1 driven by P3 is started under WLTC conditions.

[0078] In this embodiment, the formula for calculating the total number of times the P1 generator motor 4 and the P3 drive motor 1 need to be started during the design life of the P13 configuration electric drive transmission is as follows:

[0079] ∑R P1 =(k1*D p1 +k2*S p1 )*L / Q

[0080] ∑R P3 =(k1*D p3 +k2*S p3 )*L / Q

[0081] Where, ∑R P1 The P13 electric drive transmission is designed to operate on a mileage-limited P1 generator motor with a start count of 4; ∑R P3 L is the number of times the P3 drive motor 1 is started within the design mileage of the P13 electric drive transmission; Q is the design mileage of the P13 electric drive transmission; and Q is the mileage of one WLTC cycle.

[0082] In this embodiment, the formula for calculating the number of times P1 generator motor 4 and P3 drive motor 1 are started within the design life of the P13 configuration electric drive transmission under high and low temperature environments is as follows:

[0083]

[0084]

[0085]

[0086]

[0087] in, The P13 electric drive transmission is designed for use in high-temperature environments, with the P1 generator motor being started 4 times within the specified mileage. The P13 electric drive transmission is designed for use in low-temperature environments, with the P1 generator motor being started 4 times within the specified mileage. The design of the P13 electric drive transmission for high-temperature environments is based on the number of times the P3 drive motor can be started within the specified mileage. The number of times the P3 drive motor 1 is started within the design mileage of the P13 electric drive transmission under low temperature conditions; k3 is the percentage of the one-year duration under high temperature conditions; k4 is the percentage of the one-year duration under low temperature conditions.

[0088] In this embodiment, based on the development goals of the P13 configuration vehicle, the vehicle driving characteristics under WLTC conditions are simulated in both CD power consumption mode and CS power maintenance mode. Parameters related to the starting conditions, such as vehicle speed, P1 generator motor speed, P1 generator motor torque, P3 drive motor speed, P3 drive motor torque, engine speed, engine torque, transmission oil temperature, battery SOC, and duration, are extracted for both CD power consumption mode and CS power maintenance mode. Furthermore, big data analysis is used to determine the travel scenarios of the target user group and the proportion of the vehicle in CD power consumption mode and CS power maintenance mode.

[0089] This embodiment also proposes a high and low temperature start-up durability verification method for a P13 configuration electric drive transmission, including the following steps:

[0090] like Figure 2 This is a schematic diagram of the test bench layout for a P13 configuration electric drive transmission. A P13 configuration electric drive transmission 6 is constructed by assembling a P3 drive motor 1, a transmission 2, a clutch 3, and a P1 generator motor 4. This P13 configuration electric drive transmission 6 is then installed in a temperature chamber 8 on the test bench, following the vehicle's overall configuration. The input shaft of the P1 generator motor 4 is connected to the output shaft of the test bench drive motor 9. A load motor is connected to the output end of the P13 configuration electric drive transmission 6. The test bench 17 is electrically connected to the P3 drive motor 1, the P1 generator motor 4, and the test bench drive motor 9. In this embodiment, the P3 motor 1 is the drive motor.

[0091] Maintain the temperature of chamber 8 to keep the ambient temperature between 80°C and 85°C. Start the electronic oil pump to ensure lubrication requirements are met. Control the P3 motor 1 to start preheating and control the transmission oil temperature 2 within the high-temperature operating condition requirement of 115°C to 120°C. Control the speed of the frame drive motor 9 on test bench 17 to 0 and control the torque of the load motor 12 on frame 1 and the load motor 13 on frame 2 to 0. Perform a start-up durability test on the P13 configuration electric drive transmission, running the start-up condition for M high-temperature cycles.

[0092] Maintain the temperature chamber temperature and the ambient temperature between -35°C and -40°C. Start the electronic oil pump to ensure lubrication requirements are met. Control the transmission oil temperature within the range of less than or equal to 10°C required for low-temperature operation. Perform N low-temperature cycle tests on the P13 configuration electric drive transmission under low-temperature start-up durability test conditions.

[0093] It should be noted that, as Figure 5 As shown, after the start-up condition design is completed, the test implementation phase begins, including the construction of test specimens and the test system bench 18. Before the test begins after the test system is built, a test access check is performed 19. If the access check fails, the specimens are returned for re-preparation. After the access check is passed, verification of the high-temperature start-up durability condition 20 and the low-temperature start-up durability condition 21 is carried out. After the verification of the entire test condition is completed, post-test analysis and evaluation are conducted, and a report is issued 22. More specifically, the test system bench setup mainly includes assembling a P13 configuration electric drive transmission 6 from P3 drive motor 1, transmission 2, clutch 3, P1 generator motor 4, and PEU (dual motor controller) 5. The P13 configuration electric drive transmission 6 is installed in the temperature chamber 8 on the bench according to the vehicle's condition. The bench drive motor 9 is connected to the P1 generator motor 4. The output end of transmission 2 is connected to the first bench load motor 12 and the second bench load motor 13 using the first half-shaft 10 and the second half-shaft 11, respectively. The battery simulator, PEU (dual motor controller), and P3 drive motor and P1 generator motor are connected using high-voltage lines. The communication between the test bench 17 and PEU (dual motor controller) 5 and PCU (power control unit) 7 is debugged. The cooling equipment, such as water temperature and oil temperature, is connected and debugged using the product's piping. An appropriate amount of lubricating oil is added to transmission 2. The bench is debugged to ensure that the P13 configuration electric drive transmission 6 can operate normally on the bench. The pre-test access inspection should be conducted according to the access inspection rules for the high and low temperature start-up durability test of the P13 configuration electric drive transmission 6. This mainly includes product status confirmation, PEU and PCU data module inspection, test control boundary condition confirmation, and on-site safety inspection of the test bench. It should also be noted that the temperature chamber 8 should be able to maintain a temperature range consistent with the actual vehicle engine compartment or be continuously adjustable from -40℃ to 140℃, with heating time of +25℃ to +140℃ ≤ 30 min and cooling time of +25℃ to -40℃ ≤ 30 min, etc. Furthermore, the test bench 17 should be equipped with a data acquisition system capable of accurately measuring and acquiring the required test parameters such as temperature, pressure, and speed. The bench control system should be able to communicate with the electric drive transmission assembly product control systems PCU and PEU. It should be noted that the temperature control system 15 is used for temperature acquisition and control, and the early fault prediction system 16 is electrically connected to the P3 drive motor 1, transmission 2, clutch 3, and P1 generator motor 4, respectively, for assessing early faults in the P13 configuration electric drive transmission.

[0094] In this embodiment, the specific starting conditions for a single high-temperature / low-temperature start-up durability test of the P13 configuration electric drive transmission are as follows:

[0095] First, control the temperature chamber temperature and keep the ambient temperature within the range of the P13 configuration electric drive transmission durability test environment temperature. Then, start the electronic oil pump to ensure that the lubrication requirements are met.

[0096] Operating Condition 1: Performing the start-stop cycle of P1 generator motor 4 at speed n1 for 1 cycles: The test bench controls the drive motor speed to increase from 0 to N, and requests the torque of P1 generator motor 4 to increase from 0 to T over time t1. The test bench then maintains the speed N and torque T of P1 generator motor 4 for time t2, simulating the engine start-up process driven by P1 generator motor 4. Next, the test bench controls the speed of P1 generator motor 4 to change from N to n1, and the torque to change from T to T1 over time t3. The test bench then maintains the speed n1 and torque T1 of P1 generator motor 4 for time t4, simulating the power generation process of P1 generator motor 4. Finally, the test bench controls the speed of P1 generator motor 4 to decrease to 0, and requests the torque of P1 generator motor 4 to decrease to 0.

[0097] Operating Condition 2: Perform the start-stop operation of P1 generator motor 4 at speed n2 for 2 cycles: control and simulate the starting process of P1 generator motor 4 driving the engine as described in Operating Condition 1 above; then control the speed of P1 generator motor 4 to change from N to n2, and the torque of P1 generator motor 4 to change from T to T2, lasting for t6, and maintain the speed of P1 generator motor 4 at n2 and the torque of P1 generator motor 4 at T2 for a time t7, simulating the power generation process of P1 generator motor 4; finally, the test bench controls the speed of P1 generator motor 4 to drop to 0, and requests that the torque of P1 generator motor 4 drop to 0.

[0098] Operating Condition 3: Performing the start-stop cycle of P1 generator motor 4 at speed n3 for 3 cycles: Simulate the engine start-up process driven by P1 generator motor 4 as described in Operating Condition 1; then control the speed of P1 generator motor 4 to change from N to n3, and the torque of P1 generator motor 4 to change from T to T3, lasting t9, and maintain the speed n3 and torque T3 of P1 generator motor 4 for a time t. 10 The test bench simulates the power generation process of generator P1 4; finally, the test bench controls the speed of generator P1 4 to drop to 0, and requests that the torque of generator P1 4 be reduced to 0.

[0099] Operating Condition 4: Performing the start-stop cycle of P1 generator motor 4 at speed n4 for 4 cycles: Simulate the engine start-up process driven by P1 generator motor 4 as described in Operating Condition 1; then control the speed of P1 generator motor 4 from N to n4, and the torque of P1 generator motor 4 from T to T4, for a duration of t. 11 And the speed n4 of generator 4 and the torque T4 of generator 4 are maintained for a time t. 12The test bench simulates the power generation process of generator P1 4; finally, the test bench controls the speed of generator P1 4 to drop to 0, and requests that the torque of generator P1 4 be reduced to 0.

[0100] Operating Condition 5: Performing 5 cycles of start-stop operation of P3 drive motor 1 at speed n5: The test bench, in conjunction with the PEU, controls the speed of P3 drive motor 1 to increase from 0 to n5 and the torque of P3 drive motor 1 to increase from 0 to T5, for a duration of t. 14 And the P3 drive motor 1 speed n5, P3 drive motor 1 torque T5 holding time t 15 The test bench simulates the slow start-up process of a vehicle; finally, the test bench, in conjunction with the PEU control, reduces the speed of P3 drive motor 1 to 0 and the torque of P3 drive motor to 0.

[0101] Operating Condition 6: Performing 6 cycles of start-stop operation of P3 drive motor 1 at speed n6: The test bench, in conjunction with the PEU, controls the speed of P3 drive motor 1 to increase from 0 to n6 and the torque of P3 drive motor 1 to increase from 0 to T6, lasting for t seconds. 17 And the P3 drive motor 1 speed n6, P3 drive motor 1 torque T6 holding time t 18 The test bench simulates the slow start-up process of a vehicle; finally, the test bench, in conjunction with the PEU control, reduces the speed of P3 drive motor 1 to 0 and the torque of P3 drive motor to 0.

[0102] Operating Condition 7: Performing 7 cycles of start-stop operation of P3 drive motor 1 at speed n7: The test bench, in conjunction with the PEU, controls the speed of P3 drive motor 1 to increase from 0 to n7 and the torque of P3 drive motor 1 to increase from 0 to T7, lasting for t. 20 And at the P3 drive motor 1 speed n7, P3 drive motor 1 torque T7 held for time t 21 The test bench simulates the slow start-up process of a vehicle; finally, the test bench, in conjunction with the PEU control, reduces the speed of P3 drive motor 1 to 0 and the torque of P3 drive motor to 0.

[0103] Operating condition 8: Performing 8 cycles of start-stop operation of P3 drive motor 1 at speed n8: The test bench, in conjunction with the PEU, controls the speed of P3 drive motor 1 to increase from 0 to n8 and the torque of P3 drive motor 1 to increase from 0 to T8, lasting t. 23 And at the P3 drive motor 1 speed n8, P3 drive motor 1 torque T8, and holding time t 24 The test bench simulates the slow start-up process of a vehicle; finally, the test bench, in conjunction with the PEU control, reduces the speed of P3 drive motor 1 to 0 and the torque of P3 drive motor to 0.

[0104] It should be noted that for the single high temperature / low temperature start-up durability test of the P13 configuration electric drive transmission, the start-up conditions are as follows: n1 to n4 increase sequentially, and n5 to n8 increase sequentially. In order to shorten the verification cycle, it is best to perform the verification in the order of condition 1, condition 2, condition 3, condition 4, condition 5, condition 6, condition 7, and condition 8.

[0105] In this embodiment, taking the single-speed electric drive transmission with P13 configuration as an example: In the WLTC mode, k1 accounts for 74.5% of the operation under CD power consumption mode, and k2 accounts for 25.5% of the operation under CS power maintenance mode. Based on the vehicle speed, P1 generator motor 4 speed, P1 generator motor 4 torque, P3 drive motor 1 speed, P3 drive motor 1 torque, and duration of the WLTC operation under CD power consumption mode and CS power maintenance mode, the number of starts D of P1 generator motor 4 is obtained through statistical analysis. p1 For 8 times, S p1 The number of times P3 drives motor 1 to start is 20; p3 S p3 All were 9 times. According to R p1 =k1*D p1 +k2*S p1 R p3 =k1*D p3 +k2*S p3 Under a WLTC operating condition, the number of starts for P1 generator motor 4 was 8, and the number of starts for P3 drive motor 1 was 9. Based on statistical analysis of vehicle speed, P1 generator motor 4 speed, P1 generator motor 4 torque, P3 drive motor 1 speed, P3 drive motor 1 torque, and duration in the WLTC cycle data, the distribution of each speed was determined. For example... Figure 3 , Figure 4 As shown, specifically, under a WLTC operating condition, the following tests were conducted: 2 cycles of starting and stopping the P1 generator motor 4 at speed n1; 3 cycles of starting and stopping the P1 generator motor 4 at speed n2; 2 cycles of starting and stopping the P1 generator motor 4 at speed n3; 1 cycle of starting and stopping the P1 generator motor 4 at speed n4; 3 cycles of starting and stopping the P3 drive motor 1 at speed n5; 3 cycles of starting and stopping the P3 drive motor 1 at speed n6; 2 cycles of starting and stopping the P3 drive motor 1 at speed n7; and 1 cycle of starting and stopping the P3 drive motor 1 at speed n8. The single-cycle high / low temperature start-up durability test conditions are shown in the table below:

[0106]

[0107]

[0108] It should be noted that in step one of the starting conditions of the single-cycle start-up durability test, the temperature of the temperature chamber 8 is controlled to maintain the ambient temperature at T. em-h Within the range (80 to 85°C), the electronic oil pump is started to ensure lubrication requirements are met, and the P3 motor 1 is controlled to start preheating, maintaining the transmission oil temperature 2 at the T temperature required for high-temperature operation. oil-h Within the range (115 to 120°C). In step one of the single-cycle low-temperature start-up durability test conditions, the temperature of chamber 8 is controlled to maintain the ambient temperature at T. em-l Within the range (-35 to -40℃), activate the electronic oil pump to ensure lubrication requirements are met, and control the transmission oil temperature to be less than T as required by low-temperature operating conditions. oil-l Within the range (≤10℃).

[0109] Based on a WLTC cycle mileage Q of 23 kilometers, and the design service mileage L of the P13 electric drive transmission being 240,000 kilometers, according to the formula ∑R... P1 =(k1*D p1 +k2*S p1 The number of times the P1 generator motor is started within the design service mileage of the P13 electric drive transmission is calculated as ∑R * L / Q. P1 The number is 83478. According to the formula ∑R P3 =(k1*D p3 +k2*S p3 The number of times the P3 drive motor is started within the design service mileage of the P13 electric drive transmission is calculated as ∑R * L / Q. P3 The number is 93,913.

[0110] Finally, considering that the annual duration of high-temperature environments (k3) accounts for 17% and the annual duration of low-temperature environments (k4) accounts for 25%, according to the formula... The number of starts of generator P1 under high temperature conditions in this experiment was calculated separately. The number of times the P3 drive motor was started was 13913. The number is 15,652.

[0111] According to the formula The number of starts of generator P1 under low-temperature conditions in this experiment was calculated separately. For 20,870 times, the number of times the P3 drive motor 1 was started. The number of times was 23,478. After obtaining the number of times P1 generator motor 4 and P3 drive motor 1 started in a WLTC cycle, and referring to the vehicle start-stop scenario, SOC state, and the series-parallel control logic of the P13 configuration electric drive transmission, it was finally converted to a total of 1,739 high-temperature cycles and 2,609 low-temperature cycles.

[0112] In this embodiment, the P13 configuration electric drive transmission is a single-speed electric drive transmission, wherein n1, n2, n3, and n4 increase sequentially, and n5, n6, n7, and n8 increase sequentially. c1 is 2 times; c2 is 3 times; c3 is 2 times; c4 is 1 time; c5 is 3 times; c6 is 3 times; c7 is 2 times; and c8 is 1 time.

[0113] In this embodiment, since n1, n2, n3, and n4 increase sequentially, the start-stop operation of the P1 generator motor is executed in the order of condition 1, condition 2, condition 3, and condition 4. This avoids greater damage caused by starting too quickly when lubrication is insufficient. Similarly, since n5, n6, n7, and n8 increase sequentially, the start-stop operation of the P3 drive motor is executed in the order of condition 5, condition 6, condition 7, and condition 8. This also avoids greater damage caused by starting too quickly when lubrication is insufficient.

[0114] In this embodiment, after completing 1739 high-temperature cycles of the start-up durability test on the P13 configuration electric drive transmission, the P13 configuration electric drive transmission was then subjected to 2609 low-temperature cycles of the low-temperature start-up durability test.

[0115] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A starting condition design method for high and low temperature start-up durability verification of a P13 configuration electric drive transmission, characterized in that, Includes the following steps: The vehicle's operating status is divided into CD power consumption mode and CS power retention mode; Under WLTC operating conditions, determine the proportion of CD power consumption mode and CS power retention mode; Calculate the number of times each of the P1 generator motor and P3 drive motor starts under a single WLTC operating condition; Calculate the total number of times the P1 generator motor and P3 drive motor need to be started during the design life of the P13 configuration electric drive transmission; The range and duration of high and low temperature environments were determined, and combined with the thermal damage test analysis of the P13 configuration electric drive transmission, the actual engine compartment ambient temperature data and transmission oil temperature data were obtained. Then determine the range of high-temperature environments and their annual duration, and the range of low-temperature environments and their annual duration. Based on the proportion of high-temperature environment in a year and the proportion of low-temperature environment in a year, the number of times the P1 generator motor and P3 drive motor are started during the design life cycle of the P13 configuration electric drive transmission under high and low temperature environments are calculated respectively. The number of times P1 generator motor and P3 drive motor start in high and low temperature environments under a single WLTC condition is obtained. Referring to the vehicle start-stop scenario, SOC state, and the series-parallel control logic of P13 configuration electric drive transmission, the number of high temperature cycles M and the number of low temperature cycles N are finally calculated. Based on the number of times the P1 generator motor and P3 drive motor are started under a single WLTC condition, and combined with the start-stop scenarios, SOC status, series and parallel control logic of the P13 electric drive transmission, vehicle speed, P1 generator motor speed, P1 generator motor torque, P3 drive motor speed, P3 drive motor torque, engine speed, engine torque, transmission oil temperature, and start-to-stabilization time of the whole vehicle equipped with the P13 configuration electric drive transmission, the starting conditions for high and low temperature start-up durability verification of the P13 configuration electric drive transmission are constructed.

2. The starting condition design method for high and low temperature start-up durability verification of the P13 configuration electric drive transmission according to claim 1, characterized in that, The starting conditions include different gradients of P1 generator motor speed, different gradients of P1 generator motor torque, the number of times P1 generator motor is started, different gradients of P3 drive motor speed, different gradients of P3 drive motor torque, and the number of times P3 drive motor is started, based on vehicle parameters, electronic control strategy, transmission ratio, and vehicle rolling radius parameters.

3. The starting condition design method for high and low temperature start-up durability verification of the P13 configuration electric drive transmission according to claim 1, characterized in that, The formulas for calculating the number of starts for each of the P1 generator and P3 drive motor under a single WLTC operating condition are as follows: in, This represents the number of times the P1 generator motor starts under WLTC conditions. This represents the number of times the P3 drive motor is started under WLTC operating conditions. This represents the percentage of WLTC operating conditions under CD power consumption mode. This represents the percentage of WLTC operating conditions in CS power retention mode. This represents the number of times the P1 generator motor starts under WLTC operating conditions in CD power consumption mode. The number of times the P3 drive motor starts under WLTC operating conditions in CD power consumption mode; The number of times the P1 generator motor starts under WLTC conditions; This represents the number of times the P3 drive motor starts under WLTC conditions.

4. The starting condition design method for high and low temperature start-up durability verification of the P13 configuration electric drive transmission according to claim 3, characterized in that, The formula for calculating the total number of starts required for the P1 generator motor and P3 drive motor during the design life of the P13 configuration electric drive transmission is as follows: = = in, The number of times the P1 generator motor can be started within the designed mileage for the P13 electric drive transmission; P13 electric drive The transmission design utilizes the number of times the P3 drive motor is started within a given mileage. The design mileage for the P13 electric drive transmission; Q is the mileage of one WLTC cycle.

5. The starting condition design method for high and low temperature start-up durability verification of the P13 configuration electric drive transmission according to claim 3, characterized in that, The formula for calculating the number of times the P1 generator motor and P3 drive motor will start during the design life of the P13 configuration electric drive transmission under high and low temperature environments is as follows: = = = = in, The number of times the P1 generator motor can be started within the service mileage of the P13 electric drive transmission designed for high-temperature environments; The number of times the P1 generator motor can be started within the usage mileage of the P13 electric drive transmission under low-temperature conditions; The number of P3 drive motor starts within the usage mileage for the P13 electric drive transmission under high temperature conditions; The number of P3 drive motor starts within the usage mileage for the P13 electric drive transmission designed for low-temperature environments; The percentage of a year spent in high-temperature environments; This represents the percentage of a year spent in a low-temperature environment.

6. The starting condition design method for high and low temperature start-up durability verification of the P13 configuration electric drive transmission according to claim 1, characterized in that, Based on the development goals of the P13 configuration vehicle, the vehicle driving characteristics under WLTC conditions were simulated in CD power consumption mode and CS power retention mode respectively. Parameters related to the starting conditions, such as vehicle speed, P1 generator speed, P1 generator torque, P3 drive motor speed, P3 drive motor torque, engine speed, engine torque, transmission oil temperature, battery SOC and duration, were extracted in both CD power consumption mode and CS power retention mode. By combining big data analysis to identify the travel scenarios of the target user group for the vehicle, the proportion of vehicle CD power consumption mode and CS power retention mode can be determined.

7. A verification method for the starting condition design method of the P13 configuration electric drive transmission for high and low temperature start-up durability verification according to any one of claims 1 to 6, characterized in that, Includes the following steps: The P3 drive motor, transmission, clutch, and P1 generator motor are assembled to form the P13 configuration electric drive transmission. The P13 configuration electric drive transmission is installed in the temperature chamber on the test bench according to the vehicle condition. The input shaft of the P1 generator motor is connected to the output shaft of the test bench drive motor. The output end of the P13 configuration electric drive transmission is connected to the load motor. The test bench is electrically connected to the P3 drive motor, P1 generator motor and test bench drive motor respectively. Maintain the temperature chamber temperature to keep the ambient temperature between 80°C and 85°C. Start the electronic oil pump to ensure lubrication requirements are met. Control the P3 drive motor to start and preheat, and control the transmission oil temperature within the high-temperature operating condition requirement of 115°C to 120°C. Set the speed of the test bench drive motor to 0 and the torque of the load motor 1 to 0. Perform a start-up durability test on the P13 configuration electric drive transmission, running it through the start-up operating condition for M high-temperature cycles. Maintain the temperature chamber temperature and the ambient temperature between -35°C and -40°C. Start the electronic oil pump to ensure lubrication requirements are met. Control the transmission oil temperature within the range of less than or equal to 10°C required for low-temperature operation. Perform N low-temperature cycle tests on the P13 configuration electric drive transmission under low-temperature start-up durability test conditions.

8. The verification method according to claim 7, characterized in that, The specific starting conditions for a single high-temperature / low-temperature start-up durability test of the P13 configuration electric drive transmission are as follows: First, control the temperature of the temperature chamber and maintain the ambient temperature. Start the electronic oil pump to ensure lubrication needs are met; Operating Condition 1: Perform P1 generator start-stop conditions at different speeds Next cycle: The speed of the test bench control frame drive motor increases from 0 to... The test bench requested that the torque of the P1 generator motor increase from 0 to... Duration And at the P1 generator speed P1 generator torque Duration Simulate the engine starting process driven by P1 generator motor; then control the speed of P1 generator motor from Change to The torque of the P1 generator motor is determined by Change to Duration And at the P1 generator speed P1 generator torque Duration Simulate the power generation process of P1 generator motor; finally, control the speed of P1 generator motor to reduce to 0, and request that the torque of P1 generator motor be reduced to 0. Operating Condition 2: Perform P1 generator start-stop conditions at different speeds Next cycle: Control the simulated P1 generator motor to drive the engine start-up process as described in condition 1 above; then control the speed of the P1 generator motor from... Change to The torque of the P1 generator motor is determined by Change to Duration And at the P1 generator speed P1 generator torque Duration Simulate the power generation process of P1 generator motor; finally, control the speed of P1 generator motor to reduce to 0, and request that the torque of P1 generator motor be reduced to 0. Operating Condition 3: Perform P1 generator start-stop conditions at different speeds Next cycle: Control the simulated P1 generator motor to drive the engine start-up process as described in condition 1 above; then control the speed of the P1 generator motor from... Change to The torque of the P1 generator motor is determined by Change to Duration And at the P1 generator speed P1 generator torque Duration Simulate the power generation process of P1 generator motor; finally, control the speed of P1 generator motor to reduce to 0, and request that the torque of P1 generator motor be reduced to 0. Operating Condition 4: Perform P1 generator start-stop conditions at different speeds Next cycle: Control the simulated P1 generator motor to drive the engine start-up process as described in condition 1 above; then control the speed of the P1 generator motor from... Change to The torque of the P1 generator motor is determined by Change to Duration And at the P1 generator speed P1 generator torque Duration Simulate the power generation process of P1 generator motor; finally, control the speed of P1 generator motor to reduce to 0, and request that the torque of P1 generator motor be reduced to 0. Operating Condition 5: Perform P3 drive motor start-stop conditions at different speeds Next cycle: The test bench, in conjunction with the PEU control system, increases the speed of the P3 drive motor from 0 to... The torque of the P3 drive motor increased from 0 to... Duration And at the P3 drive motor speed P3 drive motor torque Duration Simulates the slow start-up process of a vehicle; Finally, the test bench, in conjunction with the PEU control, reduced the speed and torque of the P3 drive motor to 0. Operating Condition 6: Perform P3 drive motor start-stop conditions at different speeds Next cycle: The test bench, in conjunction with the PEU control system, increases the speed of the P3 drive motor from 0 to... The torque of the P3 drive motor increased from 0 to... Duration And at the P3 drive motor speed P3 drive motor torque Duration Simulates the slow start-up process of a vehicle; Finally, the test bench, in conjunction with the PEU control, reduced the speed and torque of the P3 drive motor to 0. Operating Condition 7: Perform P3 drive motor start-stop conditions at different speeds Next cycle: The test bench, in conjunction with the PEU control system, increases the speed of the P3 drive motor from 0 to... The torque of the P3 drive motor increased from 0 to... Duration And at the P3 drive motor speed P3 drive motor torque Duration Simulates the slow start-up process of a vehicle; Finally, the test bench, in conjunction with the PEU control, reduced the speed and torque of the P3 drive motor to 0. Operating Condition 8: Proceeding P3 drive motor start-stop conditions at different speeds Next cycle: The test bench, in conjunction with the PEU control system, increases the speed of the P3 drive motor from 0 to... The torque of the P3 drive motor increased from 0 to... Duration And at the P3 drive motor speed P3 drive motor torque Duration The test bench simulates the slow start-up process of a vehicle; finally, the test bench, in conjunction with the PEU control, reduces the speed and torque of the P3 drive motor to 0.

9. The verification method according to claim 8, characterized in that, The P13 configuration electric drive transmission is a single-speed electric drive transmission, wherein... , Increase sequentially, , Increase sequentially.

10. The verification method according to claim 8, characterized in that, 11. The verification method according to claim 8, characterized in that, During the start-up and shutdown of the P1 generator motor, the operation is performed in the order of operation 1, operation 2, operation 3, and operation 4; during the start-up and shutdown of the P3 drive motor, the operation is performed in the order of operation 5, operation 6, operation 7, and operation 8.

12. The verification method according to claim 7, characterized in that, After completing the start-up durability test of the P13 configuration electric drive transmission, run it through the start-up condition M times at high temperature, and then run it through the low temperature start-up durability test N times at low temperature.

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