A pump motor performance testing system

Abstract

The utility model discloses a pump motor performance test system belongs to pump motor test technical field, including power input module, load simulation module, hydraulic pressure regulation and control module and parameter acquisition module, power input module includes drive motor, and the input of drive motor is used for connecting in the input of pump motor unit, load simulation module includes loading motor, and the input of loading motor is used for connecting in the output of pump motor unit, hydraulic pressure regulation and control module are used for regulating and control pump motor unit hydraulic parameter, parameter acquisition module is used for gathering test data, the utility model discloses can simulate a variety of complex working conditions, possess high dynamic response characteristic, more comprehensive test pump motor's performance and reliability, help engineer more quickly discover problem and optimize product design.

Description

Technical Field

[0001] This utility model relates to the field of pump motor testing technology, and in particular to a pump motor performance testing system. Background Technology

[0002] Hydraulic technology, as a key technology for power transmission and control, is widely used in agricultural machinery. As a core hydraulic component of tractors, the reliability and stability of the pump motor directly affect the overall working efficiency, handling performance, and service life of the machine. Therefore, conducting scientific and accurate performance testing of pump motors is a crucial step in ensuring the quality of agricultural machinery products.

[0003] Taking the widely used hydrostatic transmission (HST) system in tractors as an example, its typical structure embodies the core role of the pump motor. The continuously variable transmission (CVT) function commonly found in modern tractors is largely based on HST. The specific working process is as follows: Engine power is transmitted to the variable displacement piston pump via the power take-off (PTO), converting mechanical energy into hydraulic energy; the driver adjusts the throttle or control lever to change the swashplate angle of the pump, thereby steplessly adjusting the flow and direction of the output hydraulic fluid, achieving smooth control of travel speed and forward / reverse movement; high-pressure hydraulic fluid is transported through pipelines to the piston motor (usually a low-speed, high-torque type) on the drive axle, driving the motor to rotate and converting hydraulic energy back into mechanical energy, ultimately driving the wheels or tracks through the output shaft or reduction gear; low-pressure return oil returns to the oil tank, completing the hydraulic cycle. This transmission method can achieve stepless speed adjustment under constant engine speed, offering advantages such as convenient operation and smooth transmission.

[0004] However, currently widely used pump motor testing equipment generally suffers from limited functionality and operating condition simulation capabilities. Most testing systems can only conduct performance verification for single or a few fixed operating conditions, making it difficult to reproduce the complex operating conditions commonly encountered in actual agricultural operations, such as low-speed, high-load tillage and high-frequency speed switching during field turns. Due to the significant differences between testing conditions and actual application environments, existing test results often fail to accurately reflect the response characteristics, efficiency distribution, and durability performance of pump motors under dynamic and varying operating conditions, easily leading to a disconnect between product design and actual needs, and even introducing reliability risks.

[0005] Therefore, there is an urgent need to develop a closed-loop pump motor unit test system and method that can simulate various complex working conditions and has high dynamic response characteristics, so as to make up for the shortcomings of existing technologies and provide a more scientific and accurate test platform for the performance verification and continuous optimization of pump motors. Utility Model Content

[0006] The purpose of this invention is to provide a pump motor performance testing system to solve the problems existing in the prior art. It can simulate a variety of complex working conditions, has high dynamic response characteristics, and more comprehensively tests the performance and reliability of pump motors, helping engineers to discover problems and optimize product design more quickly.

[0007] To achieve the above objectives, this utility model provides the following solution: This utility model provides a pump motor performance testing system, including a power input module, a load simulation module, a hydraulic control module, and a parameter acquisition module. The power input module includes a drive motor, the input end of which is connected to the input end of the pump motor unit. The load simulation module includes a loading motor, the input end of which is connected to the output end of the pump motor unit. The hydraulic control module is used to control the hydraulic parameters of the pump motor unit. The parameter acquisition module is used to acquire test data.

[0008] In one embodiment, the power input module further includes a first coupling, the load simulation module further includes a second coupling, and the parameter acquisition module includes a first torque-speed sensor and a second torque-speed sensor; the drive motor is connected to the input end of the first torque-speed sensor via the first coupling, and the output end of the first torque-speed sensor is connected to the input end of the pump motor unit; the loading motor is connected to the input end of the second torque-speed sensor via the second coupling, and the output end of the second torque-speed sensor is connected to the output end of the pump motor unit.

[0009] In one embodiment, an auxiliary protection module is also included, the auxiliary protection module including a protective cover for sealing the pump motor unit.

[0010] In one embodiment, the auxiliary support module further includes a first filter, a second oil replenishment pump, a control switch, a water chiller, and a first check valve. The oil inlet of the first filter is connected to the control switch via the second oil replenishment pump. The control switch is connected to the oil tank. The oil outlet of the first filter is connected to the inlet of the check valve via the water chiller. The outlet of the check valve is connected to the oil tank.

[0011] In one embodiment, the hydraulic control module includes a system lubrication return oil circuit, the system lubrication return oil circuit includes a second filter, the parameter acquisition module further includes a first pressure sensor, the return oil port on the protective cover is connected to the oil tank through the second filter, and the first pressure sensor is connected between the return oil port on the protective cover and the second filter.

[0012] In one embodiment, the hydraulic control module further includes a system lubrication circuit, which includes a lubrication pump, a third filter, and a third adjustable check valve. The parameter acquisition module further includes a first flow meter and a second pressure sensor. The inlet of the first flow meter is connected to the lubrication pump through the third filter. The inlet of the lubrication pump is connected to an oil tank. The intermediate oil circuit branch of the first flow meter and the third filter is sequentially connected to the third adjustable check valve and the oil tank. The outlet of the first flow meter is connected to the pump motor unit through an oil port on the protective cover. The second pressure sensor is provided between the first flow meter and the pump motor unit.

[0013] In one embodiment, the hydraulic control module further includes a system control oil circuit, which includes a first replenishing pump, a pressure reducing valve, and a fourth filter. The parameter acquisition module further includes a third pressure sensor. The outlet of the first replenishing pump is connected to the fourth filter, and the outlet of the fourth filter is connected to the pressure reducing valve. The pressure reducing valve is connected to the pump motor unit, and the third pressure sensor is disposed between the pressure reducing valve and the pump motor unit.

[0014] In one embodiment, the system further includes a first valve block and a second valve block. The first valve block is connected between the third filter and the oil outlet of the lubrication pump, and the oil outlet of the first valve block is connected to the oil tank. When the third filter is not functioning, the first valve block is opened. The second valve block is connected between the oil outlet of the first replenishing pump and the fourth filter, and the oil outlet of the second valve block is connected to the oil tank. When the fourth filter is not functioning, the second valve block is opened.

[0015] In one embodiment, the hydraulic control module further includes a system oil replenishment circuit, and the parameter acquisition module further includes a fourth pressure sensor, a fifth pressure sensor, and a second flow meter. The fourth filter is connected to the pump motor unit through the second flow meter. The fourth pressure sensor is disposed between the fourth filter and the second flow meter, and the fifth pressure sensor is disposed between the second flow meter and the pump motor unit.

[0016] In one embodiment, the hydraulic control module further includes a heat exhaust oil circuit, which includes a first adjustable check valve, a second adjustable check valve, a fifth filter, and an air cooler. The parameter acquisition module further includes a thermometer, a third flow meter, and a sixth pressure sensor. The inlet of the fifth filter is connected to the third flow meter through the first adjustable check valve. The third flow meter is connected to the pump motor unit. The thermometer is installed between the third flow meter and the pump motor unit. The sixth pressure sensor is installed between the third flow meter and the first adjustable check valve. The pipe of the sixth pressure sensor is connected to the outlet of the second adjustable check valve. The inlet of the second adjustable check valve is connected to the system oil replenishment circuit. The outlet of the fifth filter is connected to the oil tank through the air cooler.

[0017] The present invention achieves the following technical advantages over the prior art: This invention utilizes a loading motor as a load simulation module. By adjusting parameters such as the speed and torque of the loading motor, the load state can be adjusted. The hydraulic parameters of the pump motor unit are controlled by a hydraulic control module, and test data is collected by a parameter acquisition module. This allows for the simulation of various complex working conditions, exhibiting high dynamic response characteristics and providing a more comprehensive test of the pump motor's performance and reliability. This helps engineers to quickly identify problems and optimize product design. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the pump motor performance testing system in an embodiment of this utility model; The components include: 1. Drive motor; 2. First coupling; 3. First torque and speed sensor; 4. First gear shaft; 5. Second gear shaft; 6. Protective cover; 7. First motor; 8. Hydraulic pump; 9. Pump motor unit; 10. Second motor; 11. Second torque and speed sensor; 12. Second coupling; 13. Loading motor; 14. Fifth pressure sensor; 15. Sixth pressure sensor; 16. Thermometer; 17. Third flow meter; 18. First adjustable check valve; 19. Fifth filter; 20. Air cooler; 21. Second adjustable check valve; 22. Second flow meter; 23. 24. Third relief valve; 25. Second valve block; 26. Sequence valve; 27. First oil replenishment pump; 28. Fourth filter; 29. ​​Lubrication pump; 30. Pressure reducing valve; 31. Third filter; 32. First valve block; 33. Third adjustable check valve; 34. First check valve; 35. Oil tank; 36. Control switch; 37. Second oil replenishment pump; 38. First filter; 39. Water chiller; 40. First flow meter; 41. Second filter; 42. First pressure sensor; 43. Second pressure sensor; 44. Third pressure sensor; 45. Fourth pressure sensor; 46. Second check valve. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] The purpose of this invention is to provide a pump motor performance testing system to solve the problems existing in the prior art. It can simulate a variety of complex working conditions, has high dynamic response characteristics, and more comprehensively tests the performance and reliability of pump motors, helping engineers to discover problems and optimize product design more quickly.

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1As shown, this utility model provides a pump motor performance testing system, including a power input module, a load simulation module, a hydraulic control module, and a parameter acquisition module. The power input module includes a drive motor 1, the input end of which is connected to the input end of the pump motor unit 9 to provide driving power and simulate engine output characteristics. The load simulation module includes a loading motor 13, the input end of which is connected to the output end of the pump motor unit 9. By adjusting the speed and torque of the loading motor 13, different operating resistances are simulated to simulate load conditions, providing an adjustable load. The hydraulic control module is used to control the hydraulic parameters of the pump motor unit 9, including pressure, flow rate, and temperature. The parameter acquisition module is used to collect test data, including flow rate, pressure, torque, speed, and temperature. The pump motor unit 9 under test is an actual pump motor, and its combination may vary, but the working principle is basically the same: external power is input to the hydraulic pump 8, the hydraulic pump 8 provides hydraulic oil to the motor, and then the motor outputs power. The pump motor unit 9 provided in this embodiment of the present invention includes a hydraulic pump 8, a first motor 7 and a second motor 10. The input end of the hydraulic pump 8 serves as the input end of the pump motor unit 9. The first motor 7 and the second motor 10 work in parallel through a closed loop formed by the pipe plate assembly to output power.

[0024] This invention utilizes a loading motor 13 as a load simulation module. By adjusting parameters such as the speed and torque of the loading motor 13, the load state can be adjusted, allowing for simple testing of the basic performance of the pump motor unit 9. This saves subsequent testing time and costs, provides reliable assurance for subsequent assembly testing by testing personnel, and reduces unnecessary subsequent work and potential problems. The hydraulic parameters of the pump motor unit 9 are controlled by a hydraulic control module, and test data is collected by a parameter acquisition module. This allows for the simulation of various complex working conditions, possesses high dynamic response characteristics, and provides a more comprehensive test of the pump motor's performance and reliability, helping engineers to quickly identify problems and optimize product design.

[0025] In one embodiment, the power input module further includes a first coupling 2, the load simulation module further includes a second coupling 12, and the parameter acquisition module includes a first torque-speed sensor 3 and a second torque-speed sensor 11. The drive motor 1 is connected to the input end of the first torque-speed sensor 3 via the first coupling 2, and the output end of the first torque-speed sensor 3 is connected to the input end of the pump motor unit 9. The loading motor 13 is connected to the input end of the second torque-speed sensor 11 via the second coupling 12, and the output end of the second torque-speed sensor 11 is connected to the output end of the pump motor unit 9.

[0026] In this example, a first gear shaft 4 and a second gear shaft 5 are also included. The first gear shaft 4 is connected to the drive motor 1 through a first torque and speed sensor 3. The first gear shaft 4 and the second gear shaft 5 are meshed together. The second gear shaft 5 is connected to the pump shaft of the pump motor unit 9 through a spline.

[0027] In one embodiment, an auxiliary protection module is also included, which includes a protective cover 6 for sealing the pump motor unit 9 to prevent oil leakage.

[0028] In one embodiment, the auxiliary support module further includes a first filter 37, a second replenishing pump 36, a control switch 35, a water chiller 38, and a first check valve 33. The oil inlet of the first filter 37 is connected to the control switch 35 via the second replenishing pump 36. The control switch 35 is connected to the oil tank 34. The oil outlet of the first filter 37 is connected to the inlet of the first check valve 33 via the water chiller 38. The outlet of the first check valve 33 is connected to the oil tank 34. The control switch 35, the first filter 37, the water chiller 38, the first check valve 33, and the oil tank 34 form a circulating oil circuit for cooling the hydraulic oil in the oil tank 34 and maintaining the hydraulic oil at a suitable temperature.

[0029] In one embodiment, the hydraulic control module includes a system lubrication return oil circuit, i.e., an MA oil circuit, which includes a second filter 40. The parameter acquisition module also includes a first pressure sensor 41. The return oil port on the protective cover 6 is connected to the oil tank 34 through the second filter 40, and the first pressure sensor 41 is connected between the return oil port on the protective cover 6 and the second filter 40. The first pressure sensor 41 is used to detect the return oil pressure, and the second filter 40 is used to filter the return oil.

[0030] In one embodiment, the hydraulic control module further includes a system lubrication circuit, i.e., an MB circuit, which includes a lubrication pump 28, a third filter 30, and a third adjustable check valve 32. The parameter acquisition module also includes a first flow meter 39 and a second pressure sensor 42. The inlet of the first flow meter 39 is connected to the lubrication pump 28 through the third filter 30. The inlet of the lubrication pump 28 is connected to the oil tank 34. The outlet of the first flow meter 39 is connected to the pump motor unit 9 through the oil port on the protective cover 6. The lubrication pump 28 can draw oil from the oil tank 34, filter it through the third filter 30, and then enter the pump motor unit 9 through the first flow meter 39. The intermediate oil circuit branch of the first flow meter 39 and the third filter 30 is sequentially connected to the third adjustable check valve 32 and the oil tank 34. When the hydraulic oil pressure after passing through the third filter 30 exceeds the set pressure of the third adjustable check valve 32, it can be discharged into the oil tank 34. A second pressure sensor 42 is provided between the first flow meter 39 and the pump motor unit 9. The second pressure sensor 42 can monitor the oil pressure in the system's lubrication circuit.

[0031] In one embodiment, the hydraulic control module further includes a system control oil circuit, namely the MC oil circuit, which includes a first replenishing pump 26, a pressure reducing valve 29, and a fourth filter 27. The parameter acquisition module also includes a third pressure sensor 43. The outlet of the first replenishing pump 26 is connected to the fourth filter 27, and the outlet of the fourth filter 27 is connected to the pressure reducing valve 29. The pressure reducing valve 29 is connected to the pump motor unit 9. The first replenishing pump 26 can draw oil from the oil tank 34, filter it through the fourth filter 27, and then reach the pressure reducing valve 29. After being pressure reduced by the pressure reducing valve 29, the oil enters the pump motor unit 9. A third pressure sensor 43 is provided between the pressure reducing valve 29 and the pump motor unit 9. The third pressure sensor 43 is used to monitor the oil pressure in the system control oil circuit.

[0032] In one embodiment, the system further includes a first valve block 31 and a second valve block 24. The first valve block 31 is connected between the third filter 30 and the oil outlet of the lubrication pump 28, and its oil outlet is connected to the oil tank 34. When the third filter 30 is not functioning, the first valve block 31 opens to prevent the lubrication pump 28 from drawing oil that cannot be discharged, resulting in excessive pressure and potential damage. The second valve block 24 is connected between the oil outlet of the first replenishing pump 26 and the fourth filter 27, and its oil outlet is connected to the oil tank 34. When the fourth filter 27 is not functioning, the second valve block 24 opens to prevent the first replenishing pump 26 from drawing oil that cannot be discharged, resulting in excessive pressure and potential damage.

[0033] In this example, the first valve block 31 includes a cartridge valve and a first relief valve. The B port of the cartridge valve is connected between the third filter 30 and the lubrication pump 28. The cartridge valve is connected to the first relief valve, and the A port of the first relief valve is connected to the oil tank 34 to limit the maximum system pressure. The second valve block 24 contains a cartridge valve, a second relief valve, and a two-position two-way switch valve. The D port of the cartridge valve is connected between the fourth filter 27 and the first replenishing pump 26 for replenishing oil circuit pressure control.

[0034] In one embodiment, the hydraulic control module further includes a system oil replenishment circuit, namely the MD circuit, and the parameter acquisition module further includes a fourth pressure sensor 44, a fifth pressure sensor 14, and a second flow meter 22. The fourth filter 27 is connected to the pump motor unit 9 through the second flow meter 22. The fourth pressure sensor 44 is provided between the fourth filter 27 and the second flow meter 22, and the fifth pressure sensor 14 is provided between the second flow meter 22 and the pump motor unit 9.

[0035] In one embodiment, the hydraulic control module further includes a hot oil discharge circuit, i.e., an ME circuit, which includes a first adjustable check valve 18, a second adjustable check valve 21, a fifth filter 19, and an air cooler 20. The parameter acquisition module also includes a thermometer 16, a third flow meter 17, and a sixth pressure sensor 15. The inlet of the fifth filter 19 is connected to the third flow meter 17 through the first adjustable check valve 18. The third flow meter 17 is connected to the pump motor unit 9. The outlet of the fifth filter 19 is connected to the oil tank 34 through the air cooler 20. The hot oil discharged from the pump motor unit 9 is filtered by the fifth filter 19 and then reaches the air cooler 20. After being cooled by the air cooler 20, it flows into the oil tank 34. A thermometer 16 is installed between the third flow meter 17 and the pump motor unit 9. A sixth pressure sensor 15 is installed between the third flow meter 17 and the first adjustable check valve 18. The pipe of the sixth pressure sensor 15 is connected to the outlet of the second adjustable check valve 21, and the inlet of the second adjustable check valve 21 is connected to the system replenishment oil circuit. During operation, the return oil enters the air cooler 20, and the thermometer 16 monitors the return oil temperature. If the temperature exceeds the set range, the air cooler 20 starts to cool down. The first adjustable check valve 18 controls the return oil flow to match the cooling demand, and the third flow meter 17 records the cooling circuit flow to ensure that the hydraulic oil works at a suitable temperature and maintains system stability.

[0036] In this example, the inlet of the pressure reducing valve 29 is connected to the sequence valve 25 via the fourth pressure sensor 44, and to the sixth pressure sensor 15 via the second adjustable check valve 21b, and is connected in series with the MD and ME oil circuits. The outlet of the pressure reducing valve 29 is connected to the third pressure sensor 43 via the MC oil circuit, and thus communicates with the pump motor unit 9. It also includes a third overflow valve 23 and a second check valve 45. The third overflow valve 23, sequence valve 25, second flow meter 22, and second adjustable check valve 21 are connected. The third overflow valve 23 is connected to the oil tank 34 via the second check valve 45. During operation, high-pressure oil enters the third overflow valve 23. When the pressure exceeds the set value, the third overflow valve 23 opens, draining excess oil back to the oil tank 34 to prevent system overpressure damage. The second flow meter 22 monitors the overflow flow in real time, reflecting system pressure fluctuations. The third overflow valve 23 limits the maximum pressure to ensure equipment safety. According to the test requirements, the pressure of the third relief valve 23 is adjusted to apply a load to the output end of the pump motor unit 9, and the swing angle of the control mechanism of the pump motor unit 9 is adjusted to obtain the operating parameters of the hydrostatic unit under different working conditions.

[0037] The working process of the pump motor performance testing system provided by this utility model is as follows: The drive motor 1 is connected to the input end of the pump motor unit 9 via the first coupling 2 and the first torque-speed sensor 3, thus realizing power input. The first gear shaft 4 and the second gear shaft 5 on the input side of the pump motor unit 9 are meshed together, and the second gear shaft 5 is connected to the pump shaft of the pump motor unit 9 via a spline. The output side of the pump motor unit 9 is connected to the loading motor 13 via the second torque-speed sensor 11 and the second coupling 12.

[0038] By adjusting the opening pressure of the third overflow valve 23, the load on the pump motor unit 9 is adjusted, thus loading the pump motor unit 9.

[0039] The first replenishing pump 26 provides cooled hydraulic oil to the pump motor unit 9 to maintain the system pressure.

[0040] By adjusting the speed of the loading motor 13, the swing angle range of the pump motor unit 9 actuator, and the opening pressure of the third overflow valve 23, the performance of the pump motor unit 9 under different speeds, different directions, different pressures, and different loads can be tested.

[0041] This utility model pump motor performance testing system is designed with energy recycling as its core concept. It mainly consists of a drive motor 1, a loading motor 13, a measurement and control unit (hydraulic control module and parameter acquisition module) and an auxiliary support module. The working process can be divided into a preparation stage, a testing stage and a data processing stage.

[0042] The preparation phase requires system debugging and parameter setting. First, the auxiliary support module is activated, injecting hydraulic oil of a specific viscosity into the closed loop via the hydraulic power source. The temperature control device is then activated to stabilize the oil temperature within the set range (typically 80℃~85℃). After the measurement and control unit is initialized, the operator inputs test parameters, such as target speed, pressure range, and load level, through the human-machine interface. The system automatically completes sensor calibration to ensure that the accuracy of pressure, flow, torque, and other detection equipment meets the standards.

[0043] The testing phase employs a closed-loop energy flow design. Drive motor 1 in the drive unit drives pump motor unit 9, converting mechanical energy into hydraulic energy. High-pressure oil enters the motor chamber via the main oil circuit, driving the motor to output mechanical energy. Simultaneously, the load simulation module applies a load to pump motor unit 9 via load motor 13, simulating resistance under actual operating conditions. The closed-loop design allows the low-pressure oil discharged from the motor to flow directly back to the pump's suction port, only replenishing energy lost in the loop and significantly reducing energy consumption.

[0044] During the test, the measurement and control unit dynamically adjusts the system in real time. When the system detects that parameters such as pressure and speed deviate from the set values, it automatically adjusts the third relief valve 23 to maintain stable circuit pressure. If abnormalities such as overpressure or overtemperature occur, the safety protection module immediately triggers an alarm and cuts off the power source. At the same time, the high-speed data acquisition module records key data such as pressure fluctuations, flow changes, and torque output at a frequency of 100Hz, fully capturing transient operating characteristics.

[0045] After the test, the data processing phase begins. The system automatically generates charts such as pressure-flow curves and efficiency characteristic curves, removes interfering data through filtering algorithms, calculates core indicators such as volumetric efficiency and mechanical efficiency of the pump motor, and finally outputs a test report containing raw data, analysis results, and operating condition snapshots, providing accurate basis for product optimization.

[0046] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A pump motor performance testing system, characterized in that, include: A power input module, the power input module including a drive motor, the input end of the drive motor being used to connect to the input end of the pump motor unit; A load simulation module, comprising a loading motor, wherein the input terminal of the loading motor is connected to the output terminal of the pump motor unit; A hydraulic control module, which is used to control the hydraulic parameters of the pump motor unit; And a parameter acquisition module, which is used to acquire test data.

2. The pump motor performance testing system according to claim 1, characterized in that: The power input module further includes a first coupling, the load simulation module further includes a second coupling, and the parameter acquisition module includes a first torque-speed sensor and a second torque-speed sensor. The drive motor is connected to the input end of the first torque-speed sensor via the first coupling, and the output end of the first torque-speed sensor is connected to the input end of the pump motor unit. The loading motor is connected to the input end of the second torque-speed sensor via the second coupling, and the output end of the second torque-speed sensor is connected to the output end of the pump motor unit.

3. The pump motor performance testing system according to claim 1, characterized in that: It also includes an auxiliary protection module, which includes a protective cover for sealing the pump motor unit.

4. The pump motor performance testing system according to claim 3, characterized in that: The auxiliary support module also includes a first filter, a second oil replenishment pump, a control switch, a water chiller, and a first check valve. The oil inlet of the first filter is connected to the control switch through the second oil replenishment pump. The control switch is connected to the oil tank. The oil outlet of the first filter is connected to the inlet of the check valve through the water chiller. The outlet of the check valve is connected to the oil tank.

5. The pump motor performance testing system according to claim 3, characterized in that: The hydraulic control module includes a system lubrication return oil circuit, which includes a second filter. The parameter acquisition module also includes a first pressure sensor. The return oil port on the protective cover is connected to the oil tank through the second filter. The first pressure sensor is connected between the return oil port on the protective cover and the second filter.

6. The pump motor performance testing system according to claim 3, characterized in that: The hydraulic control module also includes a system lubrication circuit, which includes a lubrication pump, a third filter, and a third adjustable check valve. The parameter acquisition module also includes a first flow meter and a second pressure sensor. The inlet of the first flow meter is connected to the lubrication pump through the third filter. The inlet of the lubrication pump is connected to the oil tank. The intermediate oil circuit branch of the first flow meter and the third filter is sequentially connected to the third adjustable check valve and the oil tank. The outlet of the first flow meter is connected to the pump motor unit through the oil port on the protective cover. The second pressure sensor is provided between the first flow meter and the pump motor unit.

7. The pump motor performance testing system according to claim 6, characterized in that: The hydraulic control module further includes a system control oil circuit, which includes a first replenishing pump, a pressure reducing valve, and a fourth filter. The parameter acquisition module further includes a third pressure sensor. The oil outlet of the first replenishing pump is connected to the fourth filter, and the oil outlet of the fourth filter is connected to the pressure reducing valve. The pressure reducing valve is connected to the pump motor unit, and the third pressure sensor is provided between the pressure reducing valve and the pump motor unit.

8. The pump motor performance testing system according to claim 7, characterized in that: It also includes a first valve block and a second valve block. The first valve block is connected between the third filter and the oil outlet of the lubrication pump. The oil outlet of the first valve block is connected to the oil tank. When the third filter is not working, the first valve block is opened. The second valve block is connected between the oil outlet of the first replenishing pump and the fourth filter. The oil outlet of the second valve block is connected to the oil tank. When the fourth filter is not working, the second valve block is opened.

9. The pump motor performance testing system according to claim 7, characterized in that: The hydraulic control module also includes a system oil replenishment circuit, and the parameter acquisition module also includes a fourth pressure sensor, a fifth pressure sensor, and a second flow meter. The fourth filter is connected to the pump motor unit through the second flow meter. The fourth pressure sensor is installed between the fourth filter and the second flow meter, and the fifth pressure sensor is installed between the second flow meter and the pump motor unit.

10. The pump motor performance testing system according to claim 8, characterized in that: The hydraulic control module further includes a heat exhaust oil circuit, which includes a first adjustable check valve, a second adjustable check valve, a fifth filter, and an air cooler. The parameter acquisition module further includes a thermometer, a third flow meter, and a sixth pressure sensor. The inlet of the fifth filter is connected to the third flow meter through the first adjustable check valve. The third flow meter is connected to the pump motor unit. The thermometer is installed between the third flow meter and the pump motor unit. The sixth pressure sensor is installed between the third flow meter and the first adjustable check valve. The pipe of the sixth pressure sensor is connected to the outlet of the second adjustable check valve. The inlet of the second adjustable check valve is connected to the system oil replenishment circuit. The outlet of the fifth filter is connected to the oil tank through the air cooler.

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