Testing device for high-pressure oil pump of automobile active suspension and use method of testing device

Abstract

The invention discloses an automobile active suspension high-pressure oil pump testing device and a using method thereof. The device comprises a pre-pressing tank, a testing unit and a circulating oil way. The pre-pressing tank is used for storing oil and providing stable pre-pressure; the testing unit is used for mounting and driving a high-pressure oil pump with first and second pump ports; the circulating oil path is connected between the pre-pressing tank and two pump ports of the high-pressure oil pump to form a closed circulating loop, and comprises a loading module and a one-way valve assembly; the one-way valve assembly can automatically guide the flowing direction of oil according to the rotating direction of the high-pressure oil pump, so that any pump opening serves as an oil inlet when rotating forwards and serves as an oil outlet when rotating backwards. According to the design, self-adaptive switching of an oil way is achieved in a pure hydraulic mode, forward and reverse rotation performance testing of the oil pump can be completed without disassembling a pipeline, the problems of pre-pressure fluctuation, oil pollution and low efficiency caused by system opening in a traditional method are effectively solved, and the testing reliability and efficiency are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle suspension performance testing technology, specifically to a testing device for a high-pressure oil pump for an active automotive suspension and its usage method. Background Technology

[0002] Currently, the high-pressure oil pump in automotive active suspension is redefining the intelligent driving experience of new energy vehicles, making the car more dynamic. The high-pressure oil pump head can provide adaptive active pressure based on vehicle communication control signals to control the raising and lowering of the vehicle chassis.

[0003] In production, a high-pressure oil pump test bench system is typically used to simulate the chassis system of a complete vehicle. Regarding the structural composition of the test bench system, Chinese invention application CN117489607A, entitled "An Active Suspension Electro-hydraulic Pump Pressure Response Test Device and Usage Method," discloses that the test device includes an accumulator, a return oil tank, a return oil pump, a safety valve, and an electro-hydraulic pump. The accumulator is connected to the inlet of the electro-hydraulic pump via a pipeline, and the outlet of the electro-hydraulic pump is connected to the return oil tank via a pipeline. A safety valve is installed on the connecting pipeline between the electro-hydraulic pump and the return oil tank. The return oil pump is installed on the connecting pipeline between the accumulator and the return oil tank.

[0004] To test whether the oil pump can work normally in both forward and reverse directions, it is necessary to perform oil inlet and outlet tests on the two ports (first pump port and second pump port) of the high-pressure oil pump, including two oil inlet modes: "first pump port inlet - second pump port outlet" and "second pump port inlet - first pump port outlet". The existing technology adopts the pipeline system principle of GBT8413.2. In the test of the high-pressure oil pump of the active suspension of the automobile chassis, the pipeline is manually disassembled and the oil outlet pipeline is connected to the first or second pump port of the high-pressure oil pump to test the various operating parameters of the oil pump in the two oil inlet and outlet modes. However, this test method cannot achieve rapid switching, resulting in low test efficiency. Moreover, the pipeline system is open after disassembly, which may cause pre-pressure fluctuations in the test pipeline, or even oil leakage or contamination of the oil by external impurities, affecting the stability of the high-pressure oil pump test bench system and the reliability of the test.

[0005] Therefore, it is necessary to develop a testing device for high-pressure oil pumps of automotive active suspension with high testing efficiency and good stability, so as to enable the oil pump to achieve rapid four-quadrant operation (forward and reverse bidirectional oil passage switching) under the premise of providing continuous and stable pre-pressure to the oil pump, thereby improving the stability and reliability of the high-pressure oil pump testing device and increasing testing efficiency. Summary of the Invention

[0006] The purpose of this invention is to develop a testing device and its method for using a high-pressure oil pump for an active suspension in automobiles, in order to solve the problems of poor stability and low testing efficiency caused by the need to disassemble pipelines when testing the high-pressure oil pump of the active suspension of an automobile chassis in the prior art, and to improve testing efficiency, stability of the testing device and reliability of test results.

[0007] This invention is achieved through the following technical solution: Firstly, a testing device for a high-pressure oil pump of an active suspension system for automobiles is provided, comprising: A pre-pressurization tank is used to store oil and provide a preset pressure to the oil. The testing unit includes a fixture for positioning a high-pressure oil pump and a drive motor for driving the high-pressure oil pump, which has a first pump port and a second pump port. A circulation oil circuit connects the pre-pressure tank to the first and second pump ports of the high-pressure oil pump, forming a closed loop. The circulation oil circuit includes a loading module for providing hydraulic load and a check valve assembly configured to guide the oil flow according to the rotation direction of the high-pressure oil pump, such that either pump port of the high-pressure oil pump acts as an inlet when the pump rotates forward and as an outlet when it rotates in reverse. The check valve assembly cooperates with the loading module to ensure that the loading module applies hydraulic load only to the outlet of the high-pressure oil pump.

[0008] The beneficial effects of the above technical solution are as follows: This solution utilizes a check valve assembly in conjunction with a loading module. During motor forward and reverse rotation, the check valve assembly guides the oil flow, ensuring the loading module consistently applies a hydraulic load to the oil pump outlet while preventing interference with the oil inlet. This achieves purely hydraulic, adaptive oil circuit switching, allowing for rapid switching tests of the oil pump's forward and reverse rotation performance without disassembling or disconnecting the connecting pipelines, simply by changing the drive motor's direction. This solves the problems of system openness, pre-pressure loss, oil contamination, and low efficiency caused by pipeline disassembly in traditional testing methods, effectively improving testing efficiency and reliability. In one feasible implementation, the pre-pressure tank has a first tank opening and a second tank opening. The circulating oil circuit includes a first oil circuit connected between the first pump opening and the first tank opening, and a second oil circuit connected between the second pump opening and the second tank opening. Both the first and second oil circuits are provided with a loading module and a one-way valve assembly. The loading module includes a pressure regulating valve assembly for providing flow resistance to the oil flowing from the high-pressure oil pump to the pre-pressure tank. The one-way valve assembly includes a third one-way valve, and the pressure regulating valve assembly is connected in parallel with the third one-way valve. The third one-way valve allows the oil to flow from the pre-pressure tank to the high-pressure oil pump. The above scheme forms a closed-loop circulation system with the pre-pressure tank and high-pressure oil pump through two oil circuits (first oil circuit and second oil circuit). In the loading module of each oil circuit, a third check valve that allows oil to flow from the pre-pressure tank to the high-pressure oil pump is connected in parallel. This ensures that each oil circuit can provide smooth oil flow when used as an inlet pipeline and provide a preset flow resistance when used as an outlet pipeline. In this way, when testing the two inlet and outlet modes of the high-pressure oil pump ("first pump port inlet - second pump port outlet" and "second pump port inlet - first pump port outlet"), there is no need to manually disassemble the pipeline for switching. Stable testing of the two inlet and outlet modes of the high-pressure oil pump can be achieved directly in a closed pipeline, avoiding the pre-pressure fluctuation problem caused by the system opening due to pipeline disassembly, and greatly improving the testing efficiency.

[0009] Furthermore, both the first and second oil circuits include a one-way control module, and the one-way control module is connected between the loading module and the high-pressure oil pump. The one-way control module includes a first one-way flow path and a second one-way flow path connected in parallel. The first one-way flow path includes a first one-way valve that allows oil to flow from the high-pressure oil pump to the loading module and a first filter connected in series at the outlet of the first one-way valve. The second one-way flow path includes a second one-way valve that allows oil to flow from the loading module to the high-pressure oil pump. The setting of the first and second one-way valves ensures that the oil flows in a predetermined direction in the circulating oil circuit, prevents backflow of oil, and ensures the smooth progress of the test. The series combination of the first one-way valve and the first filter can ensure that all impurities pumped out by the tested product (high-pressure oil pump) are collected and isolated and will not enter other components. It also prevents impurities precipitated during the break-in operation of the product from flowing into the inlet of the tested product (high-pressure oil pump) in the circulation.

[0010] When the high-pressure oil pump rotates clockwise, the circulation path of the above device is as follows: the oil starts from the pre-pressure tank, enters the first oil circuit, passes through the third and second check valves, and flows to the first pump port of the high-pressure oil pump. Then, the oil flows out of the high-pressure oil pump from the second pump port and enters the second oil circuit, sequentially passing through the first check valve and the first filter, entering the loading module, and flowing to the pre-pressure tank via the pressure regulating valve assembly. During this process, the pressure regulating valve applies a set load to the second pump port of the high-pressure oil pump to simulate real flow resistance. When the high-pressure oil pump rotates counterclockwise, the circulation path of the above device is as follows: the oil starts from the pre-pressure tank, enters the second oil circuit, passes through the third and second check valves, and enters the second pump port of the high-pressure oil pump. Then, the oil flows out of the high-pressure oil pump from the first pump port and enters the first oil circuit, sequentially passing through the first check valve and the first filter, entering the loading module, and flowing to the pre-pressure tank via the pressure regulating valve assembly. During this process, the pressure regulating valve applies a set load to the first pump port of the high-pressure oil pump to simulate real flow resistance. In another feasible embodiment, the one-way valve assembly includes a fourth one-way valve, a fifth one-way valve, a sixth one-way valve, and a seventh one-way valve; the inlet of the fourth one-way valve and the inlet of the fifth one-way valve are connected and together form an oil inlet node; the outlet of the sixth one-way valve and the outlet of the seventh one-way valve are connected and together form an oil outlet node; the first pump port is simultaneously connected to the outlet of the fourth one-way valve and the inlet of the sixth one-way valve; the second pump port is simultaneously connected to the outlet of the fifth one-way valve and the inlet of the seventh one-way valve; the pre-pressure tank has a first tank opening and a second tank opening; the circulating oil circuit includes an oil inlet pipe and an oil outlet pipe; the oil inlet pipe is connected between the oil inlet node and the first tank opening; the oil outlet pipe is connected between the oil outlet node and the second tank opening; and the loading module is disposed on the oil outlet pipe. The loading module includes a pressure regulating valve assembly for applying flow resistance to the oil flowing from the high-pressure oil pump to the pre-pressure tank; The pre-pressure tank, oil inlet pipeline, one-way valve assembly, oil outlet pipeline, and high-pressure oil pump are connected by pipelines to form a closed-loop circulation circuit.

[0011] The working principle of the one-way valve assembly is as follows: When the first port of the pre-pressurization tank supplies oil to the inlet pipeline, if the oil pressure at the first pump port is less than the oil pressure at the second pump port (the high-pressure oil pump rotates clockwise), the fourth one-way valve opens, and the fifth one-way valve closes under the action of the oil pressure at the second pump port. The first pump port is the inlet, the second pump port is the outlet, and the oil flows to the outlet pipeline through the seventh one-way valve. When the first port of the pre-pressurization tank supplies oil to the inlet pipeline, if the oil pressure at the first pump port is greater than the oil pressure at the second pump port (the high-pressure oil pump rotates counterclockwise), the fifth one-way valve opens, and the fourth one-way valve closes under the action of the oil pressure at the first pump port. The second pump port is the inlet, the first pump port is the outlet, and the oil flows to the outlet pipeline through the sixth one-way valve. The aforementioned one-way valve assembly has a compact structure and relies on oil pressure to control the switching of oil flow direction. It can share the same outlet pipe when the high-pressure oil pump is in forward or reverse rotation, effectively saving the manufacturing cost of the test device. When testing the forward and reverse performance of the high-pressure oil pump ("first pump port in - second pump port out" and "second pump port in - first pump port out"), there is no need to disassemble and change the test pipe, avoiding the pre-pressure fluctuation problem caused by the system opening due to pipe disassembly, improving test efficiency. Moreover, this closed circulation loop allows the oil to circulate stably in the system, avoiding oil contamination.

[0012] Furthermore, a pressure relief valve is provided between the loading module and the high-pressure oil pump; the loading module also includes a third check valve connected in parallel with the pressure regulating valve assembly, the third check valve allowing oil to flow from the pre-pressure tank to the pressure relief valve. When disassembling the high-pressure oil pump, pressure relief is required. The pressure relief valve is used to release the oil stored in the pipeline, ensuring that the pressure in the system pipeline is safely released when the high-pressure oil pump is disassembled. The third check valve allows oil in the outlet pipeline to flow out from the pressure relief valve without backflow. Furthermore, a one-way control module is connected between the loading module and the pressure relief valve. The one-way control module includes a first one-way flow path and a second one-way flow path connected in parallel. The first one-way flow path includes a first check valve allowing oil to flow from the check valve assembly to the loading module, and a first filter connected in series at the outlet of the first check valve. The second one-way flow path includes a path allowing oil to flow from the loading module to the second check valve. The first one-way flow path connects the first one-way valve and the first filter in series, which can filter impurities in the oil flowing from the high-pressure oil pump to the loading module, ensuring the cleanliness of the oil flowing into the pre-pressure tank, preventing impurities from entering the secondary circulation and causing damage to various parts, and extending the service life of the components; the second one-way valve in the second one-way flow path allows the oil to flow from the loading module to the pressure relief valve under specific conditions, meeting the special requirements of oil flow in the system.

[0013] In the above feasible embodiments, a servo oil pump for supplying oil to the pre-pressure tank is also included. An overflow valve and a second filter are provided between the servo oil pump and the pre-pressure tank. The pre-pressure tank is connected to an accumulator, a mold temperature controller, a temperature sensor, and a first pressure sensor. The mold temperature controller is used to control the temperature of the oil in the pre-pressure tank. A high-pressure switching valve and a flow meter are provided at the first and / or second inlet of the pre-pressure tank. The pre-pressure tank is also provided with a discharge port, which is connected to a low-pressure switching valve.

[0014] In the above solutions, the pre-pressure tank and accumulator provide stable pre-pressure for the oil in the entire circulation system, effectively preventing cavitation, protecting the pump body, and providing a reference pressure source for testing. The check valve assembly has a clever check valve layout, enabling automatic and seamless switching of the oil circuit direction without the need for electronic control valve intervention. It has a short response time, a simple and reliable structure, and supports the forward and reverse rotation testing requirements of the high-pressure oil pump. The loading module, through the combination of a check valve and a proportional pressure regulating valve, achieves precise and rapid adjustment of the load at the outlet of the high-pressure oil pump. The servo oil pump and overflow valve, as the pressure source for oil supply, provide and precisely maintain the required pre-pressure for the pre-pressure tank, and are isolated from the main test circuit. This ensures stable pre-compression unaffected by test conditions; the mold temperature controller controls the temperature of the oil in the pre-compression tank, allowing for low- or high-temperature adjustment of the tested oil temperature, ensuring the accuracy and repeatability of test data under different temperature conditions, and enabling high and low temperature limit testing; the high-pressure switch valve acts as the main switch for the circulating oil circuit, and in conjunction with the low-pressure switch valve, it enables the pre-compression tank and its connecting pipelines to self-clean, flushing the pipelines without stopping the machine or disassembling, improving equipment maintenance efficiency and cleanliness; and it can self-clean to remove impurities from the system pipelines when the equipment has been running for a long time, or when the heated oil deteriorates or accumulates carbon. This invention also provides a method for using a testing device for a high-pressure oil pump of an active suspension system, applicable to the active suspension high-pressure oil pump testing device described above, comprising the following steps: S1. Starting the servo oil pump to fill the pre-pressure tank with pressurized oil, so that the oil pressure reaches a set value; preset the hydraulic load of the loading module; S2. Starting the drive motor to drive the high-pressure oil pump to rotate forward at a preset speed, the oil flows out from the pre-pressure tank, enters the first pump port of the high-pressure oil pump after passing through the one-way valve assembly, and then is discharged from the second pump port of the high-pressure oil pump, flowing to the loading module, and finally returning to the pre-pressure tank, completing the forward cycle; S3. Starting the drive motor to drive the high-pressure oil pump to rotate in reverse at a preset speed, the oil flows out from the pre-pressure tank, enters the second pump port of the high-pressure oil pump after passing through the one-way valve assembly, and then is discharged from the first pump port of the high-pressure oil pump, flowing to the loading module, and finally returning to the pre-pressure tank, completing the reverse cycle. In addition, the self-cleaning steps of the active suspension high-pressure oil pump test device as described above include: A1. closing the high-pressure switch valve and opening the low-pressure switch valve; A2. starting the servo oil pump to supply oil to the pre-pressure tank, driving the oil to flow into the pre-pressure tank at a preset flushing pressure, and discharging it through the discharge port to an external pipeline or external oil tank connected to the low-pressure switch valve, so as to flush away and remove contaminants attached to the pipeline. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pipeline connection of the test device for the high-pressure oil pump of the automotive active suspension in Example 1 (inlet of the high-pressure oil pump is at the first pump port, outlet of the second pump port). Figure 2This is a schematic diagram of the pipeline connection of the test device for the high-pressure oil pump of the automotive active suspension in Example 1 (the high-pressure oil pump enters from the second pump port and exits from the first pump port). Figure 3 This is a schematic diagram of the pipeline connection of the test device for the high-pressure oil pump of the automotive active suspension in Example 2 (oil inlet at the first pump port and oil outlet at the second pump port). Figure 4 for Figure 3 A schematic diagram of the one-way valve assembly of the test device (arrows indicate the direction of oil flow). Figure 5 This is a schematic diagram of the pipeline connection of the test device for the high-pressure oil pump of the automotive active suspension in Example 2 (oil inlet at the second pump port and oil outlet at the first pump port). Figure 6 for Figure 5 A schematic diagram of the one-way valve assembly structure of the test device (arrows indicate the direction of oil flow).

[0016] In the diagram: 1. High-pressure oil pump; 101. First pump port; 102. Second pump port; 21. First check valve; 22. Second check valve; 23. Third check valve; 24. Fourth check valve; 25. Fifth check valve; 26. Sixth check valve; 27. Seventh check valve; 31. First filter; 32. Second filter; 4. Second pressure sensor; 5. Manual regulating valve; 6. Small proportional regulating valve; 7. Large proportional regulating valve; 8. High-pressure switching valve; 9. Flow meter; 10. Temperature sensor; 11. First pressure sensor; 12. Low-pressure switching valve; 13. Relief valve; 14. Servo oil pump; 15. Accumulator; 16. Mold temperature controller; 17. Pre-pressure tank. Detailed Implementation

[0017] First, those skilled in the art should understand that the following embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0018] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0019] To make the objectives, features and advantages of the present invention more apparent and understandable, specific embodiments are described in detail below with reference to the accompanying drawings.

[0020] Example 1 like Figures 1 to 2 As shown, this embodiment provides a testing device for a high-pressure oil pump of an active suspension system in automobiles, comprising: The pre-pressure tank 17 is used to store oil and provide a preset pressure to the oil. The pre-pressure tank has a first tank opening and a second tank opening. A servo oil pump 14, whose outlet is connected to the pre-pressure tank 17, is used to supply oil to the pre-pressure tank 17; a test unit includes a fixture for installing a high-pressure oil pump 1 and a drive motor for driving the high-pressure oil pump 1, the high-pressure oil pump 1 having a first pump port 101 and a second pump port 102; a circulating oil circuit includes a first oil circuit connected between the first pump port 101 and the first tank port, and a second oil circuit connected between the second pump port 102 and the second tank port, both the first oil circuit and the second oil circuit including a unidirectional control module connected by a pipeline (…). Figure 1 , Figure 2 (as shown in area C) and loading module ( Figure 1 , Figure 2As shown in area D), the loading module is connected between the pre-pressure tank 17 and the one-way control module; the loading module includes a pressure regulating valve assembly, which has a third one-way valve 23 connected in parallel. The third one-way valve 23 allows oil to flow from the pre-pressure tank 17 to the high-pressure oil pump 1. The pressure regulating valve assembly provides flow resistance for the oil flowing from the high-pressure oil pump 1 to the pre-pressure tank 17; the one-way control module includes a first one-way flow path and a second one-way flow path connected in parallel. The first one-way flow path includes a first one-way valve 21 that allows oil to flow from the high-pressure oil pump 1 to the loading module and a first filter 31 connected in series at the outlet of the first one-way valve 21. The second one-way flow path includes a second one-way valve 22 that allows oil to flow from the loading module to the high-pressure oil pump 1; The first unidirectional flow path also includes a first unidirectional valve 21 and a first filter 31 connected in series, which ensures that impurities pumped out by the tested product (high-pressure oil pump 1) are collected and isolated, preventing them from entering other components of the hydraulic control pipeline system. It also prevents impurities precipitated during the product's break-in operation from flowing into the inlet of the high-pressure oil pump 1 during circulation. The pressure regulating valve assembly includes a manual pressure regulating valve 5, a small-proportion regulating valve 6, and a large-proportion regulating valve 7 arranged in parallel. The high-pressure oil pump 1, the circulating oil circuit, and the pre-pressure tank 17 are connected by pipelines to form a closed-loop circulation circuit. Furthermore, a second pressure sensor 4 is provided between the loading module and the unidirectional control module to monitor the load (flow resistance) applied by the loading module in real time. In addition, an accumulator 15 is provided on the pre-pressure tank 17, and a mold temperature controller 16 is connected to the pre-pressure tank 17. The combination of the pre-pressure tank and the accumulator significantly smooths system pressure fluctuations, reduces hydraulic shock, and improves the stability and data reliability of the testing process. The mold temperature controller 16 is used to control the temperature of the oil in the pre-pressure tank 17. Furthermore, an overflow valve 13 is provided between the servo oil pump 14 and the pre-pressure tank 17. The overflow valve 13 is used to control the pre-pressure value of the pre-pressure tank 17, and a second filter 32 is provided between the servo oil pump 14 and the pre-pressure tank 17. The pre-pressure tank 17 is equipped with a temperature sensor 10 and a first pressure sensor 11. In both the first and second oil circuits, a flow meter 9 and a high-pressure switching valve 8 are provided between the pre-pressure tank 17 and the loading module. The pre-pressure tank 17 is also equipped with a discharge port, and the discharge port is connected to a low-pressure switching valve 12. (See attached diagram) Figure 1 and attached Figure 2 The operating principle of this device is as follows: When the high-pressure oil pump rotates clockwise, the circulation path of this device is as follows: the oil starts from the pre-pressure tank 17, enters the first oil circuit, flows through the flow meter 9 and the high-pressure switch valve 8 which is in the open state, and then flows through the third one-way valve 23 to the one-way control module; in the one-way control module, the oil passes through the second one-way valve 22 and enters the first pump port 101 of the high-pressure oil pump 1 (the test piece). After that, the oil flows out of the high-pressure oil pump 1 from the second pump port 102 and enters the second oil circuit. It flows through the first one-way valve 21 and the first filter 31 of the one-way control module in sequence, enters the loading module, and flows to the pre-pressure tank 17 through the pressure regulating valve assembly. During this process, the pressure regulating valve assembly applies a set load to the second pump port 102 of the high-pressure oil pump 1 to simulate the real flow resistance. When the high-pressure oil pump rotates counterclockwise, the circulation path of this device is as follows: the oil starts from the pre-pressure tank 17, enters the second oil circuit, flows through the flow meter 9 and the high-pressure switch valve 8 which is in the open state, and then flows through the third check valve 23 to the one-way control module; in the one-way control module, the oil passes through the second check valve 22 and enters the second pump port 102 of the high-pressure oil pump 1 (the test piece). After that, the oil flows out of the high-pressure oil pump 1 from the first pump port 101 and enters the first oil circuit. It then flows through the first check valve 21 and the first filter 31 of the one-way control module in sequence, enters the loading module, and flows to the pre-pressure tank 17 through the pressure regulating valve assembly. During this process, the pressure regulating valve assembly applies a set load to the first pump port of the high-pressure oil pump 1 to simulate the real flow resistance. In the aforementioned structures, the pre-pressure tank and accumulator provide stable pre-pressure for the oil in the entire circulation system, effectively preventing cavitation, protecting the pump body, and providing a reference pressure source for testing. The unidirectional control module features a clever unidirectional valve layout, enabling automatic and seamless switching of the oil circuit direction without the need for electronic control valve intervention. It boasts a short response time, simple and reliable structure, and supports the forward and reverse rotation testing requirements of the high-pressure oil pump. The loading module, through a combination of a unidirectional valve and a proportional pressure regulating valve, achieves precise and rapid adjustment of the high-pressure oil pump outlet load only. The servo oil pump and overflow valve serve as the pressure source for oil supply, providing and precisely maintaining the required pre-pressure for the pre-pressure tank, and are isolated from the main test circuit. The system ensures stable pre-compression unaffected by test conditions; the mold temperature controller controls the temperature of the oil in the pre-compression tank, allowing for low- or high-temperature adjustment of the tested oil temperature, ensuring the accuracy and repeatability of test data under different temperature conditions, and enabling high and low temperature limit testing; the high-pressure switch valve acts as the main switch for the circulating oil circuit, and in conjunction with the low-pressure switch valve, it enables the pre-compression tank and its connecting pipelines to self-clean, flushing the pipelines without stopping the machine or disassembling, improving equipment maintenance efficiency and cleanliness; and it can self-clean to remove impurities from the system pipelines when the equipment has been running for a long time, or when the heated oil deteriorates or accumulates carbon.

[0021] The following are the test results of the high-pressure oil pump tested using this testing device at an oil temperature of 105±5℃: The method for testing the high-pressure oil pump using the aforementioned testing device for automotive active suspension high-pressure oil pump includes the following steps: S1. Start the servo oil pump 14 to fill the pre-pressure tank 17 with pressurized oil, so that it reaches the set pre-pressure and preset the flow resistance of the loading module; S2. Start the drive motor to drive the high-pressure oil pump 1 to rotate at a preset speed and in the positive direction (e.g., clockwise). The oil flows out from the first port of the pre-pressure tank 17 to the first oil circuit. After passing through the third check valve 23 and the second check valve 22 of the first oil circuit, it enters the first pump port 101 of the high-pressure oil pump 1. It is discharged from the second pump port 102 of the high-pressure oil pump 1 to the second oil circuit. After passing through the first check valve 21 and the first filter 31 of the first oil circuit, it enters the loading module and finally returns to the pre-pressure tank 17, completing the positive cycle. S3. Start the drive motor to drive the high-pressure oil pump 1 to rotate at a preset speed and in the opposite direction (e.g., counterclockwise). The oil flows out from the second port of the pre-pressure tank 17 to the second oil circuit, enters the second pump port 102 of the high-pressure oil pump 1 through the third check valve 23 and the second check valve 22 of the second oil circuit, is discharged from the first pump port 101 of the high-pressure oil pump 1 to the first oil circuit, enters the loading module after passing through the first check valve 21 and the first filter 31 of the second oil circuit, and finally returns to the pre-pressure tank 17 to complete the reverse cycle.

[0022] The self-cleaning steps of the testing device for the automotive active suspension high-pressure oil pump include: A1. Close the high-pressure switch valve 8 and open the low-pressure switch valve 12; A2. Start the servo oil pump 14 to drive the oil to flow into the pre-pressure tank 17 at a preset flushing pressure, and discharge it through the discharge port to the external pipeline or external oil tank connected to the low-pressure switch valve 12.

[0023] Example 2 like Figures 3 to 6 As shown, this embodiment provides another testing device for a high-pressure oil pump of an active automotive suspension, including: A pre-pressure tank 17 is used to store oil and provide a preset pressure to the oil. The pre-pressure tank 17 has a first tank opening and a second tank opening. A testing unit includes a fixture for installing a high-pressure oil pump 1 and a drive motor for driving the high-pressure oil pump 1. The high-pressure oil pump 1 has a first pump port 101 and a second pump port 102. A circulating oil circuit includes an inlet pipe, a check valve assembly, an outlet pipe, and a loading module. The check valve assembly includes a fourth check valve 24, a fifth check valve 25, a sixth check valve 26, and a seventh check valve 27. The inlet of the fourth check valve 24 and the inlet of the fifth check valve 25 are connected and together form an inlet node. The outlet of the sixth check valve 26 and the outlet of the seventh check valve 27 are connected and together form an outlet node. The first pump port 101 is simultaneously connected to the outlet of the fourth check valve 24 and the inlet of the sixth check valve 26. The second pump port 102 is simultaneously connected to the outlet of the fifth check valve 25 and the inlet of the seventh check valve 27. The oil inlet pipeline is connected between the oil inlet node and the first tank opening; the oil outlet pipeline is connected between the oil outlet node and the second tank opening; the loading module is disposed on the oil outlet pipeline; the loading module includes a pressure regulating valve assembly for applying flow resistance to the oil flowing from the high-pressure oil pump 1 to the pre-pressure tank 17; the pre-pressure tank 17, the oil inlet pipeline, the one-way valve assembly, the high-pressure oil pump 1, the oil outlet pipeline, and the loading module are connected by pipelines and form a closed circulation loop.

[0024] The working principle of the above one-way valve assembly is as follows: Reference Figure 3 , Figure 4 When the first inlet of the pre-pressurization tank 17 supplies oil to the inlet pipeline, the oil pressure at the first pump inlet 101 is less than the oil pressure at the second pump inlet 102 (the high-pressure oil pump rotates clockwise). The fourth check valve 24 opens, and the fifth check valve 25 closes under the pressure of the second pump inlet 102. The first pump inlet 101 is the inlet, and the second pump inlet 102 is the outlet. The oil flows through the seventh check valve 27 to the outlet pipeline. (Refer to...) Figure 5 , Figure 6 When the first inlet of the pre-pressurization tank 17 supplies oil to the inlet pipeline, the oil pressure at the first pump port 101 is greater than the oil pressure at the second pump port 102 (the high-pressure oil pump rotates counterclockwise), the fifth check valve 25 opens, and the fourth check valve 24 closes under the action of the oil pressure at the first pump port 101. The second pump port 102 is the inlet, the first pump port 101 is the outlet, and the oil flows to the outlet pipeline through the sixth check valve 26.

[0025] In this embodiment, the four one-way valves in the one-way valve assembly are integrated into a square baffle plate, and the specific arrangement can be referred to Figure 4 and Figure 6As shown. Furthermore, a pressure relief valve 18 is provided between the loading module and the high-pressure oil pump 1; the loading module also includes a third check valve 23 connected in parallel with the pressure regulating valve assembly, the third check valve 23 allowing oil to flow from the pre-pressure tank 17 to the pressure relief valve 18.

[0026] When disassembling the product (test component), pressure relief is required. Pressure relief valve 18 is used to release the oil remaining in the pipeline, ensuring that the pressure in the system pipeline is safely released during disassembly (currently, the pressure range in this pipeline is 10-20 bar, depending on the test requirements). The third check valve 23 allows the oil in the outlet pipeline to flow out through pressure relief valve 18 without backflow. Furthermore, a one-way control module is connected between the loading module and the pressure relief valve 18. The one-way control module includes a first one-way flow path and a second one-way flow path connected in parallel. The first one-way flow path includes a first check valve 21 that allows oil to flow from the high-pressure oil pump 1 to the loading module, and a first filter 31 connected in series at the outlet of the first check valve 21. The second one-way flow path includes a second check valve 22 that allows oil to flow from the loading module to the high-pressure oil pump 1. Furthermore, a second pressure sensor 4 is provided at the inlet of the pressure regulating valve assembly of the loading module; the pressure regulating valve assembly includes a manual pressure regulating valve 5, a small proportional regulating valve 6, and a large proportional regulating valve 7 arranged in parallel. Further, it also includes a mold temperature controller 16 connected to the pre-pressure tank 17, which controls the temperature of the oil in the pre-pressure tank 17, and an accumulator 15 connected to the pre-pressure tank 17. The combination of the pre-pressure tank 17 and the accumulator 15 can significantly smooth pressure fluctuations, reduce hydraulic shock, and improve the stability and data reliability of the testing process. This testing device also includes a servo oil pump 14 connected to the pre-pressure tank 17 for supplying oil to the pre-pressure tank 17. An overflow valve 13 and a second filter 32 are provided between the servo oil pump 14 and the pre-pressure tank 17; a temperature sensor 10 and a first pressure sensor 11 are provided on the pre-pressure tank 17, and a flow meter 9 is provided between the pre-pressure tank 17 and the loading module.

[0027] A high-pressure switch valve 8 is installed in the oil inlet pipeline, and a discharge port is also provided on the pre-pressure tank 17, and the discharge port is connected to a low-pressure switch valve 12.

[0028] The high-pressure oil pump in the active suspension of an automobile is tested using the aforementioned high-pressure oil pump testing device. The testing method includes the following steps: S1. Start the servo oil pump 14 to fill the pre-pressure tank 17 with pressurized oil, so that it reaches the set pre-pressure and preset the flow resistance of the loading module; S2. Start the drive motor to drive the high-pressure oil pump 1 to rotate at a preset speed and in the positive direction (e.g., clockwise). The oil flows out from the first port of the pre-pressure tank 17, enters the first pump port 101 of the high-pressure oil pump 1 through the one-way valve assembly, is discharged from the second pump port 102 of the high-pressure oil pump 1, flows through the one-way valve assembly to the loading module, and finally returns to the second port of the pre-pressure tank 17, completing the positive cycle. S3. Start the drive motor to drive the high-pressure oil pump 1 to rotate at a preset speed and in the opposite direction (e.g., counterclockwise). The oil flows out from the first port of the pre-pressure tank 17, enters the second port 102 of the high-pressure oil pump 1 through the one-way valve assembly, and is discharged from the first port 101 of the high-pressure oil pump 1. After passing through the one-way valve assembly, it flows to the loading module and finally returns to the second port of the pre-pressure tank 17, completing the reverse cycle.

[0029] The self-cleaning steps of the aforementioned test device for the automotive active suspension high-pressure oil pump include: A1. Close the high-pressure switch valve 8 and open the low-pressure switch valve 12; A2. Start the servo oil pump 14 to drive the oil to flow into the pre-pressure tank 17 at a preset flushing pressure, and discharge it through the discharge port to the external pipeline or external oil tank connected to the low-pressure switch valve 12.

[0030] In the description of this application, the reference to terms such as "this embodiment," "an embodiment," etc., means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A testing device for a high-pressure oil pump of an active suspension system for automobiles, comprising: Pre-pressure tank (17) is used to store oil and provide preset pressure to the oil; The test unit includes a tooling for positioning a high-pressure oil pump (1) and a drive motor for driving the high-pressure oil pump (1), the high-pressure oil pump (1) having a first pump port (101) and a second pump port (102). Its characteristic is that it further includes: A circulating oil circuit is connected between the pre-pressure tank (17) and the first pump port (101) and the second pump port (102) of the high-pressure oil pump (1), forming a closed loop; the circulating oil circuit includes: Loading module, used to provide hydraulic load; The one-way valve assembly is configured in the circulation oil circuit to guide the oil flow direction according to the rotation direction of the high-pressure oil pump (1), so that any pump port of the high-pressure oil pump (1) is used as an oil inlet when the high-pressure oil pump (1) rotates forward and as an oil outlet when the high-pressure oil pump (1) rotates in reverse; the one-way valve assembly cooperates with the loading module so that the loading module applies hydraulic load only to the oil outlet of the high-pressure oil pump.

2. The testing device for the high-pressure oil pump of an active suspension system for automobiles according to claim 1, characterized in that: The pre-pressurization tank (17) has a first tank opening and a second tank opening. The circulating oil circuit includes a first oil circuit connected between the first pump port (101) and the first tank opening, and a second oil circuit connected between the second pump port (102) and the second tank opening. Both the first oil circuit and the second oil circuit are equipped with a loading module and a one-way valve assembly. The loading module includes a pressure regulating valve assembly for providing flow resistance to oil flowing from the high-pressure oil pump (1) to the pre-pressure tank (17), the one-way valve assembly including a third one-way valve (23), and the pressure regulating valve assembly is connected in parallel with the third one-way valve (23), the third one-way valve (23) allowing oil to flow from the pre-pressure tank (17) to the high-pressure oil pump (1).

3. The testing device for the high-pressure oil pump of the automotive active suspension according to claim 2, characterized in that: Both the first oil circuit and the second oil circuit include a one-way control module, and the one-way control module is connected between the loading module and the high-pressure oil pump (1); The one-way control module includes a first one-way flow path and a second one-way flow path connected in parallel. The first one-way flow path includes a first one-way valve (21) that allows oil to flow from the high-pressure oil pump (1) to the loading module and a first filter (31) connected in series at the outlet of the first one-way valve (21). The second one-way flow path includes a second one-way valve (22) that allows oil to flow from the loading module to the high-pressure oil pump (1).

4. The testing device for the high-pressure oil pump of the automotive active suspension according to claim 1, characterized in that: The one-way valve assembly includes a fourth one-way valve (24), a fifth one-way valve (25), a sixth one-way valve (26), and a seventh one-way valve (27). The inlet of the fourth check valve (24) and the inlet of the fifth check valve (25) are connected and together form an oil inlet node; The outlet of the sixth check valve (26) and the outlet of the seventh check valve (27) are connected and together form an oil outlet node; The first pump port (101) is simultaneously connected to the outlet of the fourth check valve (24) and the inlet of the sixth check valve (26); The second pump port (102) is simultaneously connected to the outlet of the fifth check valve (25) and the inlet of the seventh check valve (27); The pre-pressurization tank (17) has a first tank opening and a second tank opening, and the circulating oil circuit includes an oil inlet pipe and an oil outlet pipe; The oil inlet pipeline is connected between the oil inlet node and the first tank opening; The oil outlet pipeline is connected between the oil outlet node and the second tank opening. The loading module is set on the oil outlet pipeline. The loading module includes a pressure regulating valve assembly for applying flow resistance to the oil flowing from the high-pressure oil pump (1) to the pre-pressure tank (17). The pre-pressurization tank (17), the oil inlet pipeline, the one-way valve assembly, the oil outlet pipeline, and the high-pressure oil pump (1) are connected by pipelines to form a closed-loop circulation circuit.

5. The testing device for the high-pressure oil pump of an active suspension system for automobiles according to claim 4, characterized in that: A pressure relief valve (18) is provided between the loading module and the high-pressure oil pump (1). The pressure regulating valve assembly is connected in parallel with a third check valve (23), which allows oil to flow from the pre-pressurization tank (17) to the pressure relief valve (18).

6. The testing apparatus for the high-pressure oil pump according to claim 5, characterized in that: A one-way control module is connected between the loading module and the pressure relief valve (18). The one-way control module includes a first one-way flow path and a second one-way flow path connected in parallel. The first one-way flow path includes a first one-way valve (21) that allows oil to flow from the high-pressure oil pump (1) to the loading module, and a first filter (31) connected in series at the outlet of the first one-way valve (21). The second one-way flow path includes a second one-way valve (22) that allows oil to flow from the loading module to the high-pressure oil pump (1).

7. The testing apparatus for a high-pressure oil pump for an active suspension system of an automobile according to any one of claims 1-6, characterized in that: It also includes a servo oil pump (14) for supplying oil to the pre-pressurization tank (17), and an overflow valve (13) and a second filter (32) are provided between the servo oil pump (14) and the pre-pressurization tank (17).

8. The testing apparatus for a high-pressure oil pump for an active suspension system of an automobile according to any one of claims 1-6, characterized in that: The pre-pressure tank (17) is connected to an accumulator (15), a mold temperature controller (16), a temperature sensor (10), and a first pressure sensor (11). The mold temperature controller (16) is used to control the temperature of the oil in the pre-pressure tank (17). A high-pressure switch valve (8) and a flow meter (9) are provided at the first and / or second openings of the pre-pressure tank (17). The pre-pressure tank (17) is also provided with a discharge port, which is connected to a low-pressure switch valve (12).

9. A method for using a testing device for a high-pressure oil pump of an active suspension system in an automobile, characterized in that, The active suspension high-pressure oil pump test device applied to any one of claims 1-8 includes the following steps: S1. Start the servo oil pump (14) to fill the pre-pressure tank (17) with pressurized oil so that the oil pressure reaches the set value; preset the hydraulic load of the loading module; S2. Start the drive motor to drive the high-pressure oil pump (1) to rotate forward at a preset speed. The oil flows out from the pre-pressure tank (17), enters the first pump port (101) of the high-pressure oil pump (1) after passing through the one-way valve assembly, and is then discharged from the second pump port (102) of the high-pressure oil pump (1), flows to the loading module, and finally returns to the pre-pressure tank (17) to complete the forward cycle. S3. Start the drive motor to drive the high-pressure oil pump (1) to reverse at a preset speed. The oil flows out from the pre-pressure tank (17), enters the second pump port (102) of the high-pressure oil pump (1) after passing through the one-way valve assembly, and is then discharged from the first pump port (101) of the high-pressure oil pump (1), flows to the loading module, and finally returns to the pre-pressure tank (17) to complete the reverse cycle.

10. A method for using a testing device for a high-pressure oil pump of an active suspension in an automobile, characterized in that: The device applied to the active suspension high-pressure oil pump test apparatus as described in claim 8 includes the following self-cleaning step: A1. Close the high-pressure switch valve (8) and open the low-pressure switch valve (12). A2. Start the servo oil pump (14) to supply oil to the pre-pressure tank (17), drive the oil to flow into the pre-pressure tank (17) at a preset flushing pressure, and discharge it through the discharge port to an external pipeline or external oil tank connected to the low-pressure switch valve (12).

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