A high frequency solenoid control chamber pressure fluctuation detection oil passage system and device

Abstract

This invention provides a high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system and device. The oil circuit system includes a pressure source, a return oil tank, a constant pressure valve assembly, a distributor valve assembly, a high-frequency solenoid valve under test, a displacement sensor, and a detection oil circuit composed of first to sixth pipelines. The pressure source is connected to the constant pressure valve assembly via the first pipeline. Its output is connected to the left and right chambers of the distributor valve assembly via the second and third pipelines, respectively. The fourth and fifth pipelines connect to the return oil from the left and right chambers, respectively, and converge into the sixth pipeline to return oil to the oil tank. The high-frequency solenoid valve under test is located on the fifth pipeline to regulate the pressure in the right chamber, and the displacement sensor detects the displacement of the follower piston. Thus, through integrated oil circuit design, accurate simulation of the output characteristics of the high-frequency solenoid valve is achieved, and the correlation between pressure fluctuations and mechanical displacement can be monitored simultaneously, providing a reliable testing platform for the performance evaluation of aero-engine blade adjusters.

Description

Technical Field

[0001] This invention belongs to the field of testing technology for hydraulic control systems of aero-engines, and in particular relates to a high-frequency electromagnetic valve control chamber pressure fluctuation detection oil circuit system and device. Background Technology

[0002] The blade adjuster is a crucial component of the aero-engine control system, used to regulate the blade angle when the engine speed or intake air temperature changes, thereby ensuring optimal engine operation. The high-frequency solenoid valve, its core component, boasts advantages such as simple structure and strong resistance to contamination. It adjusts the output flow rate proportionally by regulating the duty cycle of the control signal, thus controlling the blade angle. However, because the high-frequency solenoid valve operates in an on / off mode, pressure fluctuations are unavoidable. If these fluctuations exceed the permissible range, they can cause excessive blade oscillation, severely impacting engine operational safety.

[0003] In related technologies, the detection and evaluation of the output characteristics of high-frequency solenoid valves mainly rely on actual machine testing or simple bench tests. Often, only a single parameter can be measured, and it is impossible to simultaneously obtain multi-dimensional data such as pressure, flow rate, and actuator displacement at multiple points in the system. This results in incomplete analysis and makes it difficult to accurately assess the impact of pressure fluctuations on blade oscillation. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system and device, so as to more realistically simulate the operating conditions of the high-frequency solenoid valve, and at least partially solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the first aspect of this disclosure provides a high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system for the simulation detection of high-frequency solenoid valves in aero-engine blade adjusters, comprising: a pressure source, a return oil tank, a constant pressure valve assembly, a distribution valve assembly, the high-frequency solenoid valve under test, a displacement sensor, and a detection oil circuit.

[0006] The detection oil circuit includes a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline, and a sixth pipeline. The oil distribution valve assembly has an inner cavity and includes a follower piston. The follower piston is slidably disposed in the inner cavity and divides the inner cavity into a left cavity and a right cavity. The output end of the pressure source is connected to the input end of the constant pressure valve assembly through the first pipeline to stabilize the pressure of the working medium flowing into the first pipeline through the pressure source. The output pipeline of the constant pressure valve assembly is connected to the left cavity through the second pipeline and to the third pipeline. The pipeline connects to the right cavity, the fourth pipeline connects to the left cavity, the fifth pipeline connects to the right cavity, the end of the fourth pipeline away from the oil distribution valve assembly and the end of the fifth pipeline away from the oil distribution valve assembly are both connected to the input end of the sixth pipeline, the output end of the sixth pipeline is connected to the return oil tank, the high-frequency solenoid valve to be tested is set on the fifth pipeline to adjust the pressure of the right cavity by controlling the duty cycle signal, and the displacement sensor is set on the follower piston to detect the displacement of the follower piston.

[0007] Furthermore, the second pipeline is equipped with an inlet flow restrictor, and the fourth pipeline is equipped with an outlet flow restrictor;

[0008] The inlet flow restrictor and the outlet flow restrictor provide damping for the flow of fuel medium, thereby allowing pressure to build up in the left chamber.

[0009] Furthermore, the third pipeline is provided with an adjustment plate, which is used to stabilize the flow state of the fuel medium and provide damping for the flow of the fuel medium.

[0010] Furthermore, it also includes a first pressure sensor, a second pressure sensor, a third pressure sensor, and a fourth pressure sensor;

[0011] The first pressure sensor is installed in the second pipeline to detect the pressure in the left chamber; the second pressure sensor is installed in the third pipeline to detect the pressure in the right chamber; the third pressure sensor is installed in the output pipeline of the constant pressure valve assembly to detect the system inlet oil pressure; and the fourth pressure sensor is installed in the sixth pipeline to detect the return oil pressure.

[0012] Furthermore, it also includes flow sensors;

[0013] The flow sensor is installed on the first pipeline to detect the flow rate and fluctuation of the working medium.

[0014] Furthermore, it also includes a controller, wherein the high-frequency solenoid valve under test, the displacement sensor, the flow sensor, the first pressure sensor, the second pressure sensor, the third pressure sensor, and the fourth pressure sensor are all electrically connected to the controller.

[0015] A second aspect of this disclosure also provides a high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit device, comprising: a housing, a base, and the high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system as described above;

[0016] The upper surface of the base is provided with a bracket for mounting the housing. The high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system is set inside the housing, and the housing is provided with a mounting position for mounting the high-frequency solenoid valve to be tested.

[0017] Furthermore, the displacement sensor is configured as an LVDT displacement sensor, which is coaxially connected to the follower piston via a connecting rod, and the connecting rod is provided with a sealing ring to ensure sealing.

[0018] Through the above technical solution, the working medium is delivered to the constant pressure valve assembly through the first pipeline, thereby stabilizing the inlet pressure and providing stable and consistent initial conditions for testing. The output end of the constant pressure valve assembly is divided into the second and third pipelines, which are respectively connected to the left and right chambers of the oil distribution valve assembly, so that the working medium can independently enter the two chambers to simulate the pressure distribution under real working conditions. The high-frequency solenoid valve under test is set in the fifth pipeline, and the pressure in the right chamber is directly adjusted by controlling the duty cycle signal, thereby simulating the pressure fluctuation caused by the switching mode of the high-frequency solenoid valve. At the same time, the displacement sensor is directly installed on the follower piston to detect the displacement change of the piston in real time, forming a direct correlation with the pressure fluctuation, and thus capturing the influence of the pressure fluctuation on the piston movement. The fourth and fifth pipelines collect the return oil from the left and right chambers respectively, and merge into the sixth pipeline, finally returning the oil to the oil tank, ensuring the circulation efficiency of the working medium and the stability of the system. With the coordinated operation of the entire detection oil circuit, not only is dynamic simulation of the control chamber pressure achieved, but also pressure fluctuations are correlated with mechanical displacement through the integration of displacement sensors. This provides a reliable platform for comprehensively evaluating the output characteristics of high-frequency solenoid valves, significantly improving the accuracy of detection and engineering applicability. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system provided in an exemplary embodiment of this disclosure;

[0021] Figure 2 This is a schematic diagram of the structure of the high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit device provided in an exemplary embodiment of this disclosure;

[0022] Figure 3 This is a cross-sectional structural schematic diagram of the oil circuit device for detecting pressure fluctuations in the control chamber of a high-frequency solenoid valve provided in an exemplary embodiment of this disclosure.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Pressure source; 2. Oil return port tank; 3. Constant pressure valve assembly; 4. Oil distribution valve assembly; 401. Follow-up piston; 402. Left chamber; 403. Right chamber; 5. High-frequency solenoid valve under test; 6. Displacement sensor; 7. First pipeline; 8. Second pipeline; 9. Third pipeline; 10. Fourth pipeline; 11. Fifth pipeline; 12. Sixth pipeline; 13. Inlet flow restrictor; 14. Outlet flow restrictor; 15. Adjustment plate; 16. First pressure sensor; 17. Second pressure sensor; 18. Third pressure sensor; 19. Fourth pressure sensor; 20. Flow sensor; 21. Controller; 22. Housing; 2201. Mounting position; 23. Base; 24. Connecting rod; 25. Sealing ring. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] The first aspect of this disclosure provides a high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system, referenced... Figure 1 As shown, this high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system is used for the simulation detection of high-frequency solenoid valves in aero-engine blade adjusters. It includes: a pressure source 1, a return oil tank 2, a constant pressure valve assembly 3, a distributor valve assembly 4, the high-frequency solenoid valve under test 5, a displacement sensor 6, and a detection oil circuit. The detection oil circuit includes a first pipe 7, a second pipe 8, a third pipe 9, a fourth pipe 10, a fifth pipe 11, and a sixth pipe 12. The distributor valve assembly 4 has an inner cavity and includes a follower piston 401. The follower piston 401 is slidably disposed in the inner cavity and divides the inner cavity into a left cavity 402 and a right cavity 403. The output end of the pressure source 1 is connected to the input end of the constant pressure valve assembly 3 through the first pipe 7 to stabilize the pressure fluctuation. The pressure of the working medium flowing into the first pipeline 7 from the pressure source 1; the output pipeline of the constant pressure valve assembly 3 is connected to the left cavity 402 through the second pipeline 8 and to the right cavity 403 through the third pipeline 9; the fourth pipeline 10 is connected to the left cavity 402; the fifth pipeline 11 is connected to the right cavity 403; the end of the fourth pipeline 10 away from the oil distribution valve assembly 4 and the end of the fifth pipeline 11 away from the oil distribution valve assembly 4 are both connected to the input end of the sixth pipeline 12; the output end of the sixth pipeline 12 is connected to the return oil tank 2; the high-frequency solenoid valve 5 to be tested is set on the fifth pipeline 11 to adjust the pressure of the right cavity 403 by controlling the duty cycle signal; the displacement sensor 6 is set on the follower piston 401 to detect the displacement of the follower piston 401.

[0030] Through the above technical solution, the working medium is transported to the constant pressure valve assembly 3 through the first pipeline 7, thereby stabilizing the inlet pressure and providing stable and consistent initial conditions for testing. The output end of the constant pressure valve assembly 3 is divided into the second pipeline 8 and the third pipeline 9, which are respectively connected to the left chamber 402 and the right chamber 403 of the oil distribution valve assembly 4, so that the working medium can enter the two chambers independently to simulate the pressure distribution under real working conditions. The high-frequency solenoid valve 5 under test is set on the fifth pipeline 11, and the pressure of the right chamber 403 is directly adjusted by controlling the duty cycle signal, thereby simulating the pressure fluctuation caused by the switching mode of the high-frequency solenoid valve. At the same time, the displacement sensor 6 is directly installed on the follower piston 401 to detect the displacement change of the piston in real time, which is directly correlated with the pressure fluctuation, thereby capturing the influence of the pressure fluctuation on the piston movement. The fourth pipeline 10 and the fifth pipeline 11 collect the return oil from the left chamber 402 and the right chamber 403, respectively, and merge into the sixth pipeline 12, and finally return the oil to the return oil tank 2, ensuring the circulation efficiency of the working medium and the stability of the system. With the coordinated operation of the entire detection oil circuit, not only is dynamic simulation of the control chamber pressure achieved, but also pressure fluctuations are correlated with mechanical displacement through the integration of displacement sensor 6. This provides a reliable platform for comprehensively evaluating the output characteristics of high-frequency solenoid valves, significantly improving the accuracy of detection and engineering applicability.

[0031] In some implementations, reference Figure 1 As shown, the inlet restrictor 13 on the second pipeline 8 and the outlet restrictor 14 on the fourth pipeline 10 work together to provide damping for the flow of fuel medium. The inlet restrictor 13 controls the inlet resistance by adjusting the fuel flow rate into the left chamber 402, while the outlet restrictor 14 creates appropriate back pressure by limiting the flow cross-section of the return path in the left chamber 402. Through the coordinated work of the inlet restrictor 13 and the outlet restrictor 14, the left chamber 402 establishes a pressure environment that conforms to actual working conditions. The inlet restrictor 13 ensures the stability of the inlet pressure, and the outlet restrictor 14 maintains the balance of the return pressure. Together, they simulate the real pressure fluctuation characteristics of the control chamber when the high-frequency solenoid valve is working. This not only achieves rapid establishment and precise control of the pressure in the left chamber 402, but also ensures the realistic reproduction of the pressure fluctuation process, providing a reliable test basis for accurately evaluating the output characteristics of the high-frequency solenoid valve.

[0032] By combining the inlet flow restrictor 13 and the outlet flow restrictor 14, the pressure in the left chamber 402 can be kept stable under different operating conditions. The inlet flow restrictor 13 effectively suppresses the flow fluctuations from the pressure source 1, while the outlet flow restrictor 14 complements the inlet flow restrictor 13 by adjusting the return oil resistance. This allows the pressure in the left chamber 402 to respond quickly to changes in the operating conditions of the high-frequency solenoid valve while maintaining sufficient stability. This ensures the accuracy and repeatability of the test results and provides a more realistic and reliable operating condition simulation environment for the performance testing of high-frequency solenoid valves.

[0033] In some implementations, reference Figure 1 As shown, the third pipeline 9 is equipped with an adjustment plate 15. The adjustment plate 15 is used to stabilize the flow state of the fuel medium and provide damping for the flow of the fuel medium. Specifically, the adjustment plate 15 effectively smooths the fluctuation of the fuel medium flow, ensuring that the fuel medium entering the right cavity 403 remains stable, thereby providing consistent inlet conditions for the pressure regulation test of the high-frequency solenoid valve. Its damping characteristics work together with the inlet flow restrictor 13 and the outlet flow restrictor 14 to maintain the system pressure balance and avoid the impact of pressure changes on the measurement accuracy. At the same time, the adjustment plate 15 complements the constant pressure valve assembly 3, optimizing the flow quality on the basis of constant pressure, and ensuring that the pressure test environment of the right cavity 403 is real and reliable.

[0034] In some implementations, reference Figure 1 As shown, the oil circuit system also includes a first pressure sensor 16, a second pressure sensor 17, a third pressure sensor 18, and a fourth pressure sensor 19. Through multi-node pressure monitoring, the system achieves comprehensive control over its operating status. Specifically, the first pressure sensor 16 is located on the second pipeline 8 and directly monitors the inlet pressure of the left cavity 402, providing real-time data for establishing the pressure of the left cavity 402. The second pressure sensor 17 is located on the third pipeline 9 and specifically detects the inlet pressure of the right cavity 403, providing comparative monitoring with the first pressure sensor 16. The third pressure sensor 18 is located on the output pipeline of the constant pressure valve assembly 3 and is used to detect the system's inlet oil pressure, providing a pressure reference for the entire system. The fourth pressure sensor 19 is located on the sixth pipeline 12 and is used to detect the return oil pressure, reflecting the overall operating status of the system.

[0035] In some implementations, reference Figure 1 As shown, it also includes a flow sensor 20, which is installed on the first pipeline 7 to detect the flow rate and fluctuation of the working medium. For example, the flow sensor 20 forms a complementary monitoring relationship with the first pressure sensor 16, the second pressure sensor 17, the third pressure sensor 18, and the fourth pressure sensor 19. When the high-frequency solenoid valve 5 under test changes the pressure in the right chamber 403 by adjusting the duty cycle, it will not only cause the pressure sensor reading to change, but also detect the corresponding flow fluctuation through the flow sensor 20. Based on the flow monitoring value obtained by the flow sensor 20, more comprehensive data support can be provided for analyzing the dynamic characteristics of the high-frequency solenoid valve.

[0036] In some implementations, reference Figure 1As shown, the system also includes a controller 21. The high-frequency solenoid valve 5 under test, a displacement sensor 6, a flow sensor 20, a first pressure sensor 16, a second pressure sensor 17, a third pressure sensor 18, and a fourth pressure sensor 19 are all electrically connected to the controller 21. Through the precise coordination and control of the controller 21, comprehensive monitoring and accurate control of the output characteristics of the high-frequency solenoid valve can be achieved. Specifically, the first pressure sensor 16 and the second pressure sensor 17 transmit pressure data to the controller 21 in real time, enabling the controller 21 to synchronously compare the pressure changes in the left and right chambers 403. The third pressure sensor 18 provides a reference pressure. The fourth pressure sensor 19 provides feedback on the overall operating status of the system. Simultaneously, the flow sensor 20 monitors flow fluctuations, and the displacement sensor 6 detects piston displacement. This multi-parameter synchronous acquisition mechanism ensures the real-time correlation of pressure, flow, and displacement data, providing a complete dataset for analyzing the dynamic characteristics of the high-frequency solenoid valve. Meanwhile, the controller 21 is electrically connected to the high-frequency solenoid valve 5 under test, achieving closed-loop control. The controller 21 controls the pressure in the right chamber 403 in real time by adjusting the duty cycle signal of the high-frequency solenoid valve, and executes intelligent testing procedures (such as continuous or discrete duty cycle tests) in conjunction with sensor data. For example, in continuous testing, the controller 21 gradually increases the duty cycle (from 0% to 100%) and simultaneously records all sensor data, thereby capturing the correspondence between pressure fluctuations and displacement; or in discrete testing, the controller 21 sets the duty cycle value at a fixed point and collects parameters under specific operating conditions. The control flexibility of the controller 21 enables the hydraulic system to simulate more realistic working conditions and accurately evaluate the performance of the high-frequency solenoid valve under different operating conditions.

[0037] Based on the above technical solutions, the second aspect of this disclosure also provides a high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit device, referencing... Figure 2 and Figure 3 As shown, the high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit device includes: a housing 22, a base 23, and a high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system in any embodiment of the first aspect described above. The upper surface of the base 23 is provided with a bracket for mounting the housing 22. The high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system is disposed inside the housing 22, and the housing 22 is provided with a mounting position 2201 for mounting the high-frequency solenoid valve 5 to be tested. The mounting position 2201 enables the high-frequency solenoid valve 5 to be tested to be mounted and dismounted quickly and efficiently, significantly improving the detection efficiency.

[0038] In some embodiments, the displacement sensor 6 is configured as an LVDT displacement sensor 6. The LVDT displacement sensor 6 is coaxially connected to the follower piston 401 via a connecting rod 24, and multiple sealing rings 25 are provided at the contact point between the connecting rod 24 and the housing 22 to ensure system sealing. Specifically, firstly, the LVDT displacement sensor 6 operates based on the principle of electromagnetic induction and has the characteristics of non-contact measurement. Through the rigid coaxial connection between the connecting rod 24 and the piston, it can accurately capture the displacement changes of the follower piston 401 without being affected by oil contamination, ensuring the accuracy and reliability of displacement data. Secondly, the sealing rings 25 provided on the connecting rod 24 are made of oil-resistant rubber material, which effectively prevents high-pressure oil leakage while ensuring the freedom of piston movement, maintaining system pressure stability and ensuring a clean and safe working environment. Finally, the electrical signal output of the LVDT displacement sensor 6 is highly compatible with the controller 21. The displacement data it collects can be synchronously analyzed in real time with data from multiple pressure sensors within the controller 21, providing high-precision data support for studying the dynamic relationship between pressure fluctuations and piston displacement.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system, used for the simulation detection of high-frequency solenoid valves in aero-engine blade adjusters, characterized in that, include: Pressure source (1), return oil tank (2), constant pressure valve assembly (3), oil distribution valve assembly (4), high frequency solenoid valve to be tested (5), displacement sensor (6) and detection oil circuit; The detection oil circuit includes a first pipeline (7), a second pipeline (8), a third pipeline (9), a fourth pipeline (10), a fifth pipeline (11), and a sixth pipeline (12). The oil distribution valve assembly (4) has an inner cavity and includes a follower piston (401). The follower piston (401) is slidably disposed in the inner cavity and divides the inner cavity into a left cavity (402) and a right cavity (403). The output end of the pressure source (1) is connected to the input end of the constant pressure valve assembly (3) through the first pipeline (7) to stabilize the pressure of the working medium flowing into the first pipeline (7) through the pressure source (1). The output pipeline of the constant pressure valve assembly (3) is connected to the left cavity (402) through the second pipeline (8) and through the third pipeline (9). 9) The right cavity (403) is connected, the fourth pipeline (10) is connected to the left cavity (402), the fifth pipeline (11) is connected to the right cavity (403), the end of the fourth pipeline (10) away from the oil distribution valve assembly (4) and the end of the fifth pipeline (11) away from the oil distribution valve assembly (4) are both connected to the input end of the sixth pipeline (12), the output end of the sixth pipeline (12) is connected to the return oil tank (2), the high-frequency solenoid valve (5) to be tested is set on the fifth pipeline (11) to adjust the pressure of the right cavity (403) by controlling the duty cycle signal, and the displacement sensor (6) is set on the follower piston (401) to detect the displacement of the follower piston (401).

2. The high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system according to claim 1, characterized in that: The second pipeline (8) is equipped with an inlet flow restrictor (13), and the fourth pipeline (10) is equipped with an outlet flow restrictor (14); The inlet flow restrictor (13) and the outlet flow restrictor (14) provide damping for the flow of fuel medium, so that pressure is established in the left chamber (402).

3. The high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system according to claim 1, characterized in that: The third pipeline (9) is provided with an adjustment plate (15), which is used to stabilize the flow state of the fuel medium and provide damping for the flow of the fuel medium.

4. The high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system according to claim 1, characterized in that: It also includes a first pressure sensor (16), a second pressure sensor (17), a third pressure sensor (18), and a fourth pressure sensor (19); The first pressure sensor (16) is installed in the second pipeline (8) to detect the pressure in the left cavity (402); the second pressure sensor (17) is installed in the third pipeline (9) to detect the pressure in the right cavity (403); the third pressure sensor (18) is installed in the output pipeline of the constant pressure valve assembly (3) to detect the system inlet oil pressure; and the fourth pressure sensor (19) is installed in the sixth pipeline (12) to detect the return oil pressure.

5. The high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system according to claim 4, characterized in that: It also includes a flow sensor (20); The flow sensor (20) is installed on the first pipeline (7) to detect the flow rate and fluctuation of the working medium.

6. The high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system according to claim 5, characterized in that: It also includes a controller (21), and the high-frequency solenoid valve under test (5), the displacement sensor (6), the flow sensor (20), the first pressure sensor (16), the second pressure sensor (17), the third pressure sensor (18) and the fourth pressure sensor (19) are all electrically connected to the controller (21).

7. A high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit device, characterized in that, include: The housing (22), the base (23), and the high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system according to any one of claims 1-6; The upper surface of the base (23) is provided with a bracket for mounting the housing (22), the high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit system is set inside the housing (22), and the housing (22) is provided with a mounting position (2201) for mounting the high-frequency solenoid valve (5) to be tested.

8. The high-frequency solenoid valve control chamber pressure fluctuation detection oil circuit device according to claim 7, characterized in that: The displacement sensor (6) is configured as an LVDT displacement sensor (6), which is coaxially connected to the follower piston (401) via a connecting rod (24), and a sealing ring (25) is provided on the connecting rod (24) to ensure sealing.

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