Displacement sensor and performance testing method of proportional valve electromagnet

Abstract

The present application provides a kind of displacement sensor and the performance test method of proportional valve electromagnet, using the device suitable for the performance test of different models sensor to carry out performance test to displacement sensor, including the following method steps: S1, device power on;S2, the sensor to be measured is installed;S3, set the safety stroke of standard force sensor;S4, set high-precision grating ruler zero point;S5, performance test: test the sensitivity of displacement sensor, and displacement-force characteristic, electric signal-force characteristic and frequency response characteristic of proportional valve electromagnet.The present application is applied to the calibration and performance test of displacement sensor and proportional valve electromagnet, meets the test demand of multiple different models displacement sensor and proportional valve electromagnet, adapts to the time requirement in actual application, is convenient and fast, with wide application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensor element performance testing, and in particular to a displacement sensor and a performance testing method for a proportional valve electromagnet. BACKGROUND

[0002] With the development of modern industrial technology, the detection of working condition parameters is becoming more and more important and is also the key of the current detection technology. As a bridge between the control system and the outside world, the sensor is used by the control system to obtain the state of the object, the state of the controlled object, and the state of the surrounding environment, just like a person looks through the eyes, listens through the ears, and touches through the skin. The proportional valve electromagnet is the most widely used electro-mechanical conversion element in electro-hydraulic proportional technology, and its working characteristics have a very important influence on the performance of the electro-hydraulic proportional control element and the entire system. With the development of intelligent control technology, more and more innovative technologies are applied to displacement sensors and proportional valve electromagnets, so that the range, power supply, interface, and output and input signals of different models are different, resulting in different test steps, so that the test method and test system need to be customized, greatly increasing the development and maintenance costs, and greatly reducing the work flexibility and work efficiency. The test data is also scattered in each test system and cannot be compared and saved centrally, and there is a problem of easy loss of data and inconvenience of subsequent processing.

[0003] At present, the performance testing integrated method for various types of sensors at home and abroad is still in the initial stage, and there is no separate device suitable for testing various types of sensors. How to integrate the characteristics of various types of sensors into one testing method is still a problem to be solved. SUMMARY

[0004] The present application provides a performance testing method for a displacement sensor and a proportional valve electromagnet to solve the technical problems of the performance testing of the existing displacement sensor and proportional valve electromagnet, which needs to be customized, has high maintenance cost, has high work flexibility, and has low work efficiency.

[0005] The technical scheme provided by the present application is as follows:

[0006] One object of the present application is to provide a performance testing method for a displacement sensor, which uses a device suitable for performance testing of different types of sensors to test the performance of the displacement sensor.

[0007] The device comprises a box body and a table top fixed on the box body, and an execution mechanism is arranged on the table top.

[0008] The execution mechanism comprises at least a sensor mounting head, a standard force sensor, and a high-precision grating ruler.

[0009] The sensor mounting head is used for mounting a measured displacement sensor or a measured proportional valve electromagnet; and the sensor mounting head is configured to move in six degrees of freedom directions to adjust the position of the measured displacement sensor or the measured proportional valve electromagnet.

[0010] The standard force sensor is configured to move linearly towards or away from the sensor mounting head;

[0011] The high-precision grating ruler is arranged on the table top, and the high-precision grating ruler is parallel to the linear movement direction of the standard force sensor;

[0012] The performance test method comprises the following method steps:

[0013] S1, power on the device:

[0014] Start the device suitable for performance test of different types of sensors;

[0015] S2, install the measured displacement sensor:

[0016] Install the measured displacement sensor on the sensor mounting head, adjust the position of the measured displacement sensor in six degrees of freedom directions, and make the telescopic rod of the measured displacement sensor in the same straight line with the standard force sensor;

[0017] S3, set the safe stroke of the standard force sensor:

[0018] Drive the standard force sensor to move towards the sensor mounting head, so that the standard force sensor extrudes the telescopic rod of the measured displacement sensor;

[0019] Collect the first position data of the high-precision grating ruler when the telescopic rod of the measured displacement sensor contacts the standard force sensor, and the second position data of the high-precision grating ruler when the telescopic rod of the measured displacement sensor is in the compression limit position;

[0020] Record the first position data and the second position data, and take the distance between the first position data and the second position data as the safe stroke of the standard force sensor;

[0021] S4, set the zero point of the high-precision grating ruler:

[0022] Select half of the difference between the first position data and the second position data as the zero point of the high-precision grating ruler;

[0023] S5, performance test:

[0024] Select the positive stroke range and the negative stroke range of the standard force sensor on both sides of the zero point of the high-precision grating ruler;

[0025] In the positive and negative stroke ranges of the standard force sensor, the standard force sensor is driven to move linearly towards or away from the sensor mounting head, so that the standard force sensor presses the telescopic rod of the measured displacement sensor;

[0026] In the positive and negative stroke ranges of the standard force sensor, the position data of the high-precision grating ruler at different positions and the corresponding electrical signals of the measured displacement sensor at the position data of the high-precision grating ruler are collected;

[0027] The position data of the high-precision grating ruler at different positions and the corresponding electrical signals of the measured displacement sensor at the position data of the high-precision grating ruler are fitted into an electrical signal-displacement curve;

[0028] The slope of the electrical signal-displacement curve represents the sensitivity of the measured displacement sensor.

[0029] In a preferred embodiment, the table top is fixed with guide rails and a linear motor;

[0030] A sliding block is slidably installed on the guide rails and connected to the output end of the linear motor;

[0031] A protective bracket is fixed on the sliding block, a mounting bracket is fixedly installed on the protective bracket, and the standard force sensor is fixed on the mounting bracket.

[0032] In a preferred embodiment, a scanner is fixed on the sliding block, and when the standard force sensor moves linearly towards or away from the sensor mounting head, the scanner scans the high-precision grating ruler to trigger the high-precision grating ruler to generate position data.

[0033] In a preferred embodiment, a multi-degree-of-freedom adjustment table is fixed on the table top, a clamping mechanism is fixed on the multi-degree-of-freedom adjustment table, and the sensor mounting head is fixed on the clamping mechanism;

[0034] The multi-degree-of-freedom adjustment table moves in six degrees of freedom, driving the sensor mounting head to move in six degrees of freedom, so as to adjust the position of the measured displacement sensor or the measured proportional valve electromagnet.

[0035] In a preferred embodiment, a control system is arranged in the box, and the control system at least includes an electrical measurement module, a motion controller, and a programmable power supply / drive circuit;

[0036] The electrical measurement module is used to collect the electrical signals of the measured displacement sensor, the force signals of the standard force sensor, and the position data of the high-precision grating ruler;

[0037] The motion controller is configured to drive the standard force sensor to move linearly towards or away from the sensor mounting head.

[0038] The programmable power supply / drive circuit is configured to apply an electrical signal to the measured proportional valve electromagnet.

[0039] In a preferred embodiment, the electrical measurement module employs a high-precision 7 ½ -digit benchtop multimeter.

[0040] In a preferred embodiment, the control system further comprises a driver, and the motion controller is connected to the driver.

[0041] The motion controller sends a control signal to the driver to drive the standard force sensor to move linearly towards or away from the sensor mounting head.

[0042] In a preferred embodiment, the control system further comprises a signal conditioning circuit, a GPIB communication interface, and a power supply module.

[0043] The signal conditioning circuit is connected to the electrical measurement module, and the signal conditioning circuit is configured to condition the signals collected by the electrical measurement module.

[0044] The GPIB communication interface is connected to the signal conditioning circuit, the motion controller, and the programmable power supply / drive circuit.

[0045] The GPIB communication interface is configured to communicate the signal conditioning circuit, the motion controller, and the programmable power supply / drive circuit with a host computer, respectively.

[0046] Another object of the present application is to provide a performance testing method for proportional valve electromagnets, which uses a device suitable for performance testing of different types of sensors to test the performance of displacement sensors.

[0047] The device comprises a box body and a table top fixed on the box body, and an execution mechanism is arranged on the table top.

[0048] The execution mechanism at least comprises a sensor mounting head, a standard force sensor, and a high-precision grating ruler.

[0049] The sensor mounting head is configured to mount a measured displacement sensor or a measured proportional valve electromagnet, and the sensor mounting head is configured to move in six degrees of freedom to adjust the position of the measured displacement sensor or the measured proportional valve electromagnet.

[0050] The standard force sensor is configured to move linearly towards or away from the sensor mounting head.

[0051] The high-precision grating ruler is arranged on the table top, and the high-precision grating ruler is parallel to the linear motion direction of the standard force sensor.

[0052] A performance test method, comprising the following method steps:

[0053] S1, the device is powered on:

[0054] Start the device suitable for performance test of different types of sensors;

[0055] S2, the measured proportional valve electromagnet is installed:

[0056] The measured proportional valve electromagnet is installed on the sensor mounting head, the position of the measured displacement sensor is adjusted in six degrees of freedom, the measured proportional valve electromagnet is in the same straight line with the standard force sensor, and the standard force sensor is adjusted to contact the measured proportional valve electromagnet;

[0057] S3, set the safety stroke of the standard force sensor:

[0058] According to the rated parameters of the measured proportional valve electromagnet, an electric signal is applied to the measured proportional valve electromagnet, so that the force generated by the measured proportional valve electromagnet drives the standard force sensor to move away from the sensor mounting head;

[0059] Collect the third position data of the high-precision grating ruler when the measured proportional valve electromagnet contacts the standard force sensor, and the fourth position data of the high-precision grating ruler when the force generated by the measured proportional valve electromagnet is equal to the rated force;

[0060] Record the third position data and the fourth position data, and take the distance between the third position data and the fourth position data as the safety stroke of the standard force sensor;

[0061] S4, set the zero point of the high-precision grating ruler:

[0062] The rated parameters of the measured proportional valve electromagnet are 30%-50%, an electric signal is applied to the measured proportional valve electromagnet, so that the force generated by the measured proportional valve electromagnet drives the standard force sensor to move away from the sensor mounting head;

[0063] Collect the force signal of the standard force sensor driven by the measured proportional valve electromagnet until the force signal of the standard force sensor driven by the measured proportional valve electromagnet reaches the preset threshold value;

[0064] When the force signal of the standard force sensor driven by the measured proportional valve electromagnet reaches the preset threshold value, the corresponding position data of the high-precision grating ruler is collected as the zero point of the high-precision grating ruler;

[0065] S5, performance test:

[0066] Applying different electric signals to the measured proportional valve electromagnet to make the measured proportional valve electromagnet generate force to push the standard force sensor away from the sensor mounting head;

[0067] Collecting different force signals of the standard force sensor and position data of the high-precision grating ruler corresponding to different force signals of the standard force sensor;

[0068] Fitting the different force signals of the standard force sensor and the position data of the high-precision grating ruler corresponding to the different force signals of the standard force sensor into a displacement-force curve to test the displacement-force characteristics of the measured proportional valve electromagnet;

[0069] Fitting the different force signals of the standard force sensor and the different electric signals applied to the measured proportional valve electromagnet into an electric signal-force curve to test the electric signal-force characteristics of the measured proportional valve electromagnet.

[0070] In a preferred embodiment, in step S5, the frequency response characteristics of the measured proportional valve electromagnet are also tested, including the following method steps:

[0071] Within the safe stroke range of the standard force sensor on both sides of the zero point of the high-precision grating ruler, the position data of the high-precision grating ruler is arbitrarily selected as the frequency response characteristic test position;

[0072] The electric signal of the measured proportional valve electromagnet corresponding to the frequency response characteristic test position is taken as the frequency response characteristic test electric signal;

[0073] The frequency response characteristic test electric signal is continuously applied to the measured proportional valve electromagnet, and the change value of the force signal of the standard force sensor pushed by the measured proportional valve electromagnet is collected;

[0074] The change value of the force signal of the standard force sensor pushed by the measured proportional valve electromagnet is fitted with the duration of continuously applying the frequency response characteristic test electric signal to the measured proportional valve electromagnet into a time-force curve to test the frequency response characteristics of the measured proportional valve electromagnet.

[0075] Compared with the prior art, the above technical solutions of the present application have at least the following beneficial effects:

[0076] The present application provides a displacement sensor and a performance test method for a proportional valve electromagnet, which has high flexibility, high adaptability and other advantages. The displacement sensor test and the proportional valve electromagnet test are integrated on the same test bench, which greatly improves the flexibility and efficiency of the test, reduces the deviation and error caused by the need for different methods and test benches in the past, greatly reduces the development and maintenance cost, has high work flexibility, greatly improves the work efficiency, and the test data is convenient for centralized comparison and preservation.

[0077] The present application provides a kind of displacement sensor and the performance test method of proportional valve electromagnet, it is applied to the calibration and performance test of displacement sensor and proportional valve electromagnet, meet the test needs of a variety of different models displacement sensor and proportional valve electromagnet, adapt to the time requirement in actual application, it is convenient and fast, with wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0078] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative labor based on the drawings also belong to the protection scope of the present application.

[0079] Figure 1 is a front view of a device suitable for performance testing of different types of sensors according to the present application.

[0080] Figure 2 is a perspective view of a device suitable for performance testing of different types of sensors according to the present application.

[0081] Figure 3 is a structural schematic diagram of an actuator according to the present application.

[0082] Figure 4 is a structural block diagram of a control system according to the present application.

[0083] Figure 5 is a schematic diagram of the displacement sensor fitting in an embodiment of the present application.

[0084] Figure 6 is a schematic diagram of the displacement-force curve of the proportional valve electromagnet fitting in an embodiment of the present application.

[0085] Figure 7 is a schematic diagram of the electrical signal-force curve of the proportional valve electromagnet fitting in an embodiment of the present application.

[0086] Figure 8 is a schematic diagram of the time-force curve of the proportional valve electromagnet fitting in an embodiment of the present application. DETAILED DESCRIPTION

[0087] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor also belong to the protection scope of the present application.

[0088] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Unless otherwise defined, the terms "first", "second", and similar terms are used to distinguish one element from another, but do not otherwise limit the elements. Also, the terms "one", "another", or "the" are not limited to one instance unless otherwise indicated by the context. The terms "including" and / or "containing" shall mean the inclusion of at least the recited item or group of items and shall not be limited to an inclusion of only that item or group of items. The term "connected" or "coupled" shall not be limited to a direct connection or coupling, but may also include an indirect connection or coupling.

[0089] It should be noted that the terms "upper", "lower", "left", "right", "front", "back", etc. are used only to indicate relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.

[0090] In combination with Figure 1 , Figure 2 and Figure 3 , according to an embodiment of the present application, a device suitable for performance testing of different types of sensors is provided, comprising a box body 100 and a table top 200 fixed on the box body 100. An actuator 300 is arranged on the table top 200. In the present embodiment, the table top 200 is a marble table top.

[0091] The actuator 300 comprises a sensor mounting head 309, a standard force sensor 306 and a high-precision grating ruler 310.

[0092] The sensor mounting head 309 is used to mount a measured displacement sensor or a measured proportional valve electromagnet. The sensor mounting head 309 is configured to move in six degrees of freedom to adjust the position of the measured displacement sensor or the measured proportional valve electromagnet.

[0093] Specifically, the actuator 300 further comprises a multi-degree-of-freedom adjustment table 307, and the multi-degree-of-freedom adjustment table 307 is fixed on the table top 200. A clamping mechanism 308 is fixed on the multi-degree-of-freedom adjustment table 307, and the sensor mounting head 309 is fixed on the clamping mechanism 308.

[0094] The multi-degree-of-freedom adjustment table 307 moves in six degrees of freedom, driving the clamping mechanism 308 and the sensor mounting head 309 to move in six degrees of freedom, thereby adjusting the position of the measured displacement sensor or the measured proportional valve electromagnet.

[0095] According to the embodiment of the present application, the standard force sensor 306 is configured to move linearly (the moving direction is shown as arrow a in Figure 3 FIG. 3) towards or away from the sensor mounting head 309.

[0096] Specifically, the actuator 300 further comprises a guide rail 304 and a linear motor 301. The guide rail 304 and the linear motor 301 are fixed on the table top 200, and the slide block 302 is slidingly installed on the guide rail 304 and connected with the output end of the linear motor 301.

[0097] A protection bracket 303 is fixed on the slide block 302, and a mounting bracket 305 is fixed on the protection bracket 303, and the standard force sensor 306 is fixed on the mounting bracket 305.

[0098] The output end of the linear motor 301 drives the slide block 302 to move linearly (the moving direction is shown as arrow a in Figure 3 FIG. 3) on the guide rail 304, and the slide block 302 drives the protection bracket 303, the mounting bracket 305 and the standard force sensor 306 to move linearly (the moving direction is shown as arrow a in Figure 3 FIG. 3) towards or away from the sensor mounting head 309.

[0099] The protection bracket 303 protects the standard force sensor 306, avoiding accidents caused by impact during the linear movement of the standard force sensor 306 towards or away from the sensor mounting head 309.

[0100] As shown in Figure 3 , according to the embodiment of the present application, a high-precision grating ruler 310 is arranged on the table top 200, and the direction of the linear movement of the high-precision grating ruler 310 is parallel to the direction of the linear movement of the standard force sensor 306 (the moving direction is shown as arrow a in Figure 3 FIG. 3).

[0101] A scanner 311 is fixed on the slide block 302. When the standard force sensor 306 moves linearly towards or away from the sensor mounting head 309, the scanner 311 scans the high-precision grating ruler 310 to trigger the high-precision grating ruler 310 to generate position data.

[0102] In combination with Figure 1 , Figure 2 , Figure 3 and Figure 4 , according to the embodiment of the present application, a control system 400 is arranged in the box 100. The control system 400 comprises an electrical measurement module 401, a signal conditioning circuit 402, a motion controller 403, a driver 404, a GPIB communication interface 405, a programmable power supply / drive circuit 406, and a power module 407.

[0103] The electric measuring module 401 is used to collect the electric signal of the measured displacement sensor, the force signal of the standard force sensor 306 and the position data of the high-precision grating ruler 310.

[0104] The electric measuring module 401 is connected with the standard force sensor 306 and the high-precision grating ruler 310. When the performance test of the displacement sensor is performed, the measured displacement sensor is connected with the electric measuring module 401, and the electric signal of the measured displacement sensor and the position data of the high-precision grating ruler 310 are collected through the electric measuring module 401.

[0105] In a preferred embodiment, the electric measuring module 401 adopts a high-precision 7 ½ bit bench-type multimeter, and can collect multiple types of signals, such as voltage, current, RS232, RS485 and CAN.

[0106] The signal conditioning circuit 402 is connected with the electric measuring module 401. The signal conditioning circuit 402 is used to condition the signal collected by the electric measuring module 401.

[0107] The motion controller 403 is used to drive the standard force sensor 306 to move linearly towards or away from the sensor mounting head 309 (the motion direction is shown by arrow a in the middle). Figure 3

[0108] Specifically, the motion controller 403 is connected with the driver 404, and the driver 404 is connected with the linear motor 301. The motion controller 403 sends a control signal to the driver 404, the driver 404 drives the linear motor 301 to act, and the linear motor 301 drives the slider 302 to move linearly on the guide rail 304 (the motion direction is shown by arrow a in the middle), and the slider 302 drives the protective bracket 303, the mounting bracket 305 and the standard force sensor 306 to move linearly towards or away from the sensor mounting head 309. Figure 3

[0109] The programmable power / drive circuit 406 is used to apply an electric signal to the measured proportional valve electromagnet. When the performance test of the proportional valve electromagnet is performed, the measured proportional valve electromagnet is connected with the programmable power / drive circuit 406, and the programmable power / drive circuit 406 is used to apply an electric signal to the measured proportional valve electromagnet.

[0110] The GPIB communication interface 405 is connected with the signal conditioning circuit, the motion controller and the programmable power / drive circuit. The GPIB communication interface 405 is used to respectively communicate the signal conditioning circuit, the motion controller and the programmable power / drive circuit with the host computer 500.

[0111] The power module 407 is used to supply power to the control system 400, the measured displacement sensor or the measured proportional valve electromagnet. ​​

[0112] As shown in the box 100, the power-on switch 600, the power-off switch 700, the control system 400 control power indicator 800, the control system 400 power indicator 900, and the emergency stop switch 1000 are provided. Figure 1 The power-on switch 600 is used to control the opening of the control system 400. The power-off switch 700 is used to control the closing of the control system 400. The emergency stop switch 1000 is used to control the power-off of the control system 400 in emergency state.

[0113] The control power indicator 800 is used to display the power-on state of the electrical measurement module 401, the signal conditioning circuit 402, the GPIB communication interface 405, and the programmable power supply / drive circuit 406 of the control system 400. That is, when the electrical measurement module 401, the signal conditioning circuit 402, the GPIB communication interface 405, and the programmable power supply / drive circuit 406 of the control system 400 are powered on, the control power indicator 800 is lit.

[0114] The power indicator 900 is used to display the power-on state of the motion controller 403 and the driver 404 of the control system 400. That is, when the motion controller 403 and the driver 404 of the control system 400 are powered on, the power indicator 900 is lit.

[0115] According to the embodiment of the present application, a performance testing method of displacement sensor is provided, which uses a device suitable for performance testing of different types of sensors to test the performance of displacement sensor, including the following method steps:

[0116] Step S1, power on the device.

[0117] Start the device suitable for performance testing of different types of sensors. Start the power-on switch 600 on the box 100, and the control power indicator 800 and the power indicator 900 are lit.

[0118] Step S2, install the measured displacement sensor.

[0119] Install the measured displacement sensor on the sensor mounting head 309, adjust the position of the measured displacement sensor in six degrees of freedom direction through the multi-degree-of-freedom adjustment table 307, so that the telescopic rod of the measured displacement sensor is in the same straight line with the standard force sensor 309 (the telescopic rod of the measured displacement sensor is aligned with the standard force sensor 309).

[0120] Connect the measured displacement sensor with the electrical measurement module 401 of the control system 400. Start the host computer 500, and establish communication between the host computer 500 and the control system 400 through the GPIB communication interface 405.

[0121] Connect the measured displacement sensor with the electrical measurement module 401 of the control system 400. Start the host computer 500, and establish communication between the host computer 500 and the control system 400 through the GPIB communication interface 405.

[0122] Step S3, set the safety stroke of the standard force sensor 306.

[0123] Drive the standard force sensor 306 to move towards the sensor mounting head 309, so that the standard force sensor 306 presses the telescopic rod of the measured displacement sensor.

[0124] Specifically, the host computer 500 sends instructions to the motion controller 403 through the GPIB communication interface 405, the motion controller 403 sends control signals to the driver 404, the driver 404 drives the linear motor 301 to act, and the linear motor 301 drives the slider 302 to move linearly on the guide rail 304 (the movement direction is shown by arrow a in the middle). Figure 3 The slider 302 drives the protective support 303, the mounting support 305 and the standard force sensor 306 to move towards the sensor mounting head 309, so that the standard force sensor 306 presses the telescopic rod of the measured displacement sensor.

[0125] Collect the first position data of the high-precision grating ruler 310 when the telescopic rod of the measured displacement sensor contacts the standard force sensor 306, and the second position data of the high-precision grating ruler 306 when the telescopic rod of the measured displacement sensor is at the compression limit position.

[0126] Specifically, the standard force sensor 306 moves towards the sensor mounting head 309 and presses the telescopic rod of the measured displacement sensor. During this process, the electrical measurement module 401 collects the electrical signal of the measured displacement sensor and the position data of the high-precision grating ruler 310, and sends them to the host computer 500 through the signal conditioning circuit 402 and the GPIB communication interface 405 after conditioning.

[0127] In this embodiment, the electrical signal collected by the electrical measurement module 401 of the measured displacement sensor is a current signal. In some embodiments, the electrical signal collected by the electrical measurement module 401 of the measured displacement sensor can also be a voltage signal.

[0128] When the telescopic rod of the measured displacement sensor contacts the standard force sensor 306, the electrical measurement module 401 collects the electrical signal of the measured displacement sensor as an electrical signal and the first position data of the high-precision grating ruler 310. At this time, the first position data of the high-precision grating ruler 310 collected is the position data of the telescopic rod of the measured displacement sensor in the tensile limit state.

[0129] When the telescopic rod of the measured displacement sensor is at the compression limit position, the electrical measurement module 401 collects the electrical signal of the measured displacement sensor as an electrical signal and the second position data of the high-precision grating ruler 310. At this time, the second position data of the high-precision grating ruler 310 collected is the position data of the telescopic rod of the measured displacement sensor in the compression limit state.

[0130] The state of the telescopic rod of the measured displacement sensor contacting the standard force sensor 306 and the state of the telescopic rod of the measured displacement sensor at the compression limit position are determined according to the electrical signal of the measured displacement sensor collected by the electrical measurement module 401.

[0131] The first position data and the second position data are recorded, and the distance between the first position data and the second position data is taken as the safe stroke of the standard force sensor 306.

[0132] In some embodiments, in order to avoid damage to the measured displacement sensor caused by the standard force sensor 306, the distance between the first position data and the second position data is appropriately reduced as the safe stroke of the standard force sensor 306.

[0133] Step S4, setting the zero point of the high-precision grating ruler 310.

[0134] The midpoint position of the distance between the first position data and the second position data is selected as the zero point of the high-precision grating ruler 310.

[0135] Step S5, performance test.

[0136] The positive stroke range and the negative stroke range of the standard force sensor 306 are selected on both sides of the zero point of the high-precision grating ruler 310.

[0137] For example, a position between the zero point of the high-precision grating ruler 310 and the first position data is selected, and the distance between the position and the zero point of the high-precision grating ruler 310 is taken as the positive stroke range of the standard force sensor 306.

[0138] Another position between the zero point of the high-precision grating ruler 310 and the second position data is selected, and the distance between the position and the zero point of the high-precision grating ruler 310 is taken as the negative stroke range of the standard force sensor 306.

[0139] Within the positive stroke range and the negative stroke range of the standard force sensor 306, the standard force sensor 306 is driven to move linearly towards or away from the sensor mounting head 309, so that the standard force sensor 306 presses the telescopic rod of the measured displacement sensor.

[0140] Specifically, the host computer 500 sends instructions to the motion controller 403 through the GPIB communication interface 405, the motion controller 403 sends control signals to the driver 404, the driver 404 drives the linear motor 301 to act, and the linear motor 301 drives the slider 302 to move linearly on the guide rail 304 (the motion direction is as shown in the figure). Figure 3The slider 302 drives the protection bracket 303, the mounting bracket 305 and the standard force sensor 306 to move linearly towards or away from the sensor mounting head 309, so that the standard force sensor 306 extrudes the telescopic rod of the measured displacement sensor.

[0141] The different position data of the high-precision grating ruler 310 in the positive and negative stroke ranges of the standard force sensor 306 and the corresponding electrical signals of the measured displacement sensor under the different position data of the high-precision grating ruler 310 are collected.

[0142] Specifically, in the process that the standard force sensor 306 moves linearly towards or away from the sensor mounting head 309 so that the standard force sensor 306 extrudes the telescopic rod of the measured displacement sensor in the positive and negative stroke ranges of the standard force sensor 306, the electrical measurement module 401 collects the different position data of the high-precision grating ruler 310 and the corresponding electrical signals of the measured displacement sensor under the different position data of the high-precision grating ruler 310, and sends the data to the upper computer 500 through the signal conditioning circuit 402 and the GPIB communication interface 405 after conditioning.

[0143] The different position data of the high-precision grating ruler 310 and the corresponding electrical signals of the measured displacement sensor under the different position data of the high-precision grating ruler 310 are fitted into an electrical signal-displacement curve.

[0144] The slope of the electrical signal-displacement curve represents the sensitivity of the measured displacement sensor.

[0145] In the embodiment, the collected electrical signal of the measured displacement sensor is a current signal, and the fitted electrical signal-displacement curve of the different position data of the high-precision grating ruler 310 and the corresponding electrical signals of the measured displacement sensor under the different position data of the high-precision grating ruler 310 is a current-displacement curve, as shown in FIG. 6. Figure 5 The slope of the current-displacement curve represents the sensitivity of the measured displacement sensor, and a test report of the displacement sensor is generated.

[0146] According to the embodiment of the present application, a performance test method of a proportional valve electromagnet is provided, and the proportional valve electromagnet is tested by using the device suitable for performance test of different types of sensors provided by the present application, including the following method steps:

[0147] Step S1, power on the device.

[0148] Start the device suitable for performance test of different types of sensors. Start the power-on switch 600 on the box body 100, and control the power-on indicator light 800 and the power-on indicator light 900 to turn on.

[0149] Step S2, install the measured proportional valve electromagnet.

[0150] The measured proportional valve electromagnet is installed on the sensor mounting head 309, and the position of the measured displacement sensor is adjusted in six degrees of freedom directions, so that the measured proportional valve electromagnet is in the same straight line with the standard force sensor 306 (the telescopic rod of the measured displacement sensor is aligned with the standard force sensor 309).

[0151] The standard force sensor 306 is adjusted to be in contact with the measured proportional valve electromagnet. Specifically, the slider 302 is manually adjusted to slide on the guide rail 304 in a straight line direction, so that the standard force sensor 306 is in contact with the measured proportional valve electromagnet (only contact without extrusion).

[0152] The measured proportional valve electromagnet is connected with the programmable power supply / drive circuit 406 of the control system 400. The host computer 500 is started, and the host computer 500 is communicated with the control system 400 through the GPIB communication interface 405.

[0153] Step S3, set the safe stroke of the standard force sensor 306.

[0154] According to the rated parameters of the measured proportional valve electromagnet, an electric signal is applied to the measured proportional valve electromagnet, so that the force generated by the measured proportional valve electromagnet drives the standard force sensor 306 to move away from the sensor mounting head 309.

[0155] The rated parameters of the measured proportional valve electromagnet include rated voltage, rated current, rated force and stroke range. In this embodiment, the rated current of the measured proportional valve electromagnet is used to apply an electric signal (current signal) to the measured proportional valve electromagnet.

[0156] Specifically, the host computer 500 sends instructions to the programmable power supply / drive circuit 406 through the GPIB communication interface 405, and the programmable power supply / drive circuit 406 applies an electric signal to the measured proportional valve electromagnet, so that the force generated by the measured proportional valve electromagnet drives the standard force sensor 306 to move away from the sensor mounting head 309.

[0157] In this embodiment, the programmable power supply / drive circuit 406 gradually increases the electric signal applied to the measured proportional valve electromagnet from 0 mA to the rated current.

[0158] The third position data of the high-precision grating ruler 310 when the measured proportional valve electromagnet contacts the standard force sensor 306 is collected, and the fourth position data of the high-precision grating ruler 310 when the force generated by the measured proportional valve electromagnet is equal to the rated force is collected.

[0159] Specifically, in the process that the force generated by the measured proportional valve electromagnet pushes the standard force sensor 306 to move away from the sensor mounting head 309, the electric measurement module 401 collects the force signal of the standard force sensor 306 pushed by the measured proportional valve electromagnet and the position data of the high-precision grating ruler 310, and sends the force signal and the position data to the upper computer 500 through the signal conditioning circuit 402 and the GPIB communication interface 405 after conditioning.

[0160] When the measured proportional valve electromagnet contacts the standard force sensor 306, the electric measurement module 401 collects the force signal of the standard force sensor 306 pushed by the measured proportional valve electromagnet and the third position data of the high-precision grating ruler 310. At this time, the third position data of the high-precision grating ruler 310 is the position data of the measured proportional valve electromagnet without generating force (0 mA of current applied to the measured proportional valve electromagnet).

[0161] When the force generated by the measured proportional valve electromagnet is equal to the rated force, the electric measurement module 401 collects the force signal of the standard force sensor 306 pushed by the measured proportional valve electromagnet and the fourth position data of the high-precision grating ruler 310. At this time, the fourth position data of the high-precision grating ruler 310 is the position data of the measured proportional valve electromagnet with rated force (rated current of the current signal applied to the measured proportional valve electromagnet).

[0162] The third position data and the fourth position data are recorded, and the distance between the third position data and the fourth position data is taken as the safe stroke of the standard force sensor 306.

[0163] In some embodiments, in order to avoid damage to the measured proportional valve electromagnet, the distance between the third position data and the fourth position data is appropriately reduced as the safe stroke of the standard force sensor 306.

[0164] Step S4, set the zero point of the high-precision grating ruler 310.

[0165] The measured proportional valve electromagnet is applied with an electric signal at 30%-50% of the rated parameter of the measured proportional valve electromagnet, so that the force generated by the measured proportional valve electromagnet pushes the standard force sensor 306 to move away from the sensor mounting head 309.

[0166] Specifically, the measured proportional valve electromagnet is applied with an electric signal (current signal) at 30%-50% of the rated current of the measured proportional valve electromagnet by the programmable power supply / drive circuit 406, so that the force generated by the measured proportional valve electromagnet pushes the standard force sensor 306 to move away from the sensor mounting head 309 (the standard force sensor 306 moves away from the sensor mounting head 309 from the position where the standard force sensor 306 contacts the measured proportional valve electromagnet).

[0167] The standard force sensor 306 receives the force signal from the measured proportional valve electromagnet until the force signal reaches a preset threshold (a preset force value).

[0168] When the force signal of the standard force sensor 306 reaches the preset threshold, the position data of the corresponding high-precision grating ruler 310 is collected as the zero point of the high-precision grating ruler 310.

[0169] Specifically, in the process of the force generated by the measured proportional valve electromagnet pushing the standard force sensor 306 away from the sensor mounting head 309, the electrical measurement module 401 collects the force signal of the standard force sensor 306 pushed by the measured proportional valve electromagnet, and the position data of the corresponding high-precision grating ruler 310 corresponding to the force signal of the standard force sensor 306 pushed by the measured proportional valve electromagnet.

[0170] When the force signal of the standard force sensor 306 reaches the preset threshold, the position data of the corresponding high-precision grating ruler 310 is collected as the zero point of the high-precision grating ruler 310.

[0171] Step S5, performance test.

[0172] Different electrical signals are applied to the measured proportional valve electromagnet to make the force generated by the measured proportional valve electromagnet push the standard force sensor 306 away from the sensor mounting head 309.

[0173] The different force signals of the standard force sensor 309 and the position data of the high-precision grating ruler 310 corresponding to the different force signals of the standard force sensor 306 are collected.

[0174] Specifically, within the safe stroke range (the range of electrical signals corresponding to the third position data and the fourth position data, for example, the range of 0 mA to the rated current), the programmable power supply / drive circuit 406 applies different electrical signals (current signals) to the measured proportional valve electromagnet to make the force generated by the measured proportional valve electromagnet push the standard force sensor 306 away from the sensor mounting head 309.

[0175] The electrical measurement module 401 collects the different force signals (force signals pushed by the measured proportional valve electromagnet) of the standard force sensor 306 and the position data of the high-precision grating ruler 310 corresponding to the different force signals of the standard force sensor 306, and sends them to the upper computer 500 through the signal conditioning circuit 402 and the GPIB communication interface 405 after conditioning.

[0176] In some embodiments, within a safe travel range (a range of electrical signals corresponding to the third and fourth position data, for example, a range of 0 mA to a rated current), the programmable power / drive circuit 406 applies different electrical signals (current signals) to the measured proportional valve solenoid step by step. For example, the current slow (default 0.05 Hz, editable) is continuously increased and decreased step by step between 0 and the rated current.

[0177] The different force signals of the standard force sensor 306 and the position data corresponding to the different force signals of the quasi-force sensor 306 of the high-precision grating ruler 310 are fitted into a displacement-force curve to test the displacement-force characteristics of the measured proportional valve solenoid.

[0178] As shown in Figure 6 , in one embodiment, the displacement-force curve fitted from the different force signals of the standard force sensor 306 and the position data corresponding to the different force signals of the quasi-force sensor 306 of the high-precision grating ruler 310. Figure 6 In the figure, curve X is the displacement-force curve fitted from the different force signals of the standard force sensor 306 and the position data corresponding to the different force signals of the quasi-force sensor 306 of the high-precision grating ruler 310 when the programmable power / drive circuit 406 applies a current of 2.0 A to the measured proportional valve solenoid.

[0179] Figure 6 In the figure, curve Y is the displacement-force curve fitted from the different force signals of the standard force sensor 306 and the position data corresponding to the different force signals of the quasi-force sensor 306 of the high-precision grating ruler 310 when the programmable power / drive circuit 406 applies a current of 1.3 A to the measured proportional valve solenoid.

[0180] Figure 6 In the figure, curve Z is the displacement-force curve fitted from the different force signals of the standard force sensor 306 and the position data corresponding to the different force signals of the quasi-force sensor 306 of the high-precision grating ruler 310 when the programmable power / drive circuit 406 applies a current of 0.7 A to the measured proportional valve solenoid.

[0181] The different force signals of the standard force sensor 306 and the different electrical signals applied to the measured proportional valve solenoid are fitted into an electrical signal-force curve to test the electrical signal-force characteristics of the measured proportional valve solenoid.

[0182] In one embodiment, the programmable power / drive circuit 406 applies different current signals to the measured proportional valve solenoid step by step, and the electrical measurement module 401 collects different force signals of the standard force sensor 309 (force signals received by the measured proportional valve solenoid), and the electrical signal-force curve fitted from the different force signals of the standard force sensor 306 and the different electrical signals applied to the measured proportional valve solenoid is a current-force curve, as shown in Figure 7 .

[0183] According to the embodiment of the present application, the performance test of the proportional valve electromagnet further comprises testing the frequency response characteristic of the tested proportional valve electromagnet, including the following method steps:

[0184] In the safety stroke range of the standard force sensor 306 on both sides of the zero point of the high-precision grating ruler 310, the position data of the high-precision grating ruler 310 is randomly selected as the frequency response characteristic test position.

[0185] For example, in this embodiment, the position of 1.25 mm on the positive side of the zero point of the high-precision grating ruler 310 is selected as the frequency response characteristic test position.

[0186] The electrical signal of the tested proportional valve electromagnet corresponding to the frequency response characteristic test position is taken as the frequency response characteristic test electrical signal.

[0187] The programmable power / drive circuit 406 applies an electrical signal to the tested proportional valve electromagnet, and the electrical measurement module 401 collects the position data corresponding to the high-precision grating ruler 310 during the process of the force generated by the tested proportional valve electromagnet pushing the standard force sensor 306 away from the sensor mounting head 309. In this embodiment, the electrical signal of the tested proportional valve electromagnet corresponding to the position of 1.25 mm on the positive side of the zero point of the high-precision grating ruler 310 is 1.0 A, and 1.0 A is taken as the frequency response characteristic test electrical signal (current signal).

[0188] The programmable power / drive circuit 406 continuously applies the frequency response characteristic test electrical signal (for example, 1.0 A) to the tested proportional valve electromagnet, and the electrical measurement module 401 collects the change value of the force signal of the standard force sensor 306 pushed by the tested proportional valve electromagnet.

[0189] The change value of the force signal of the standard force sensor 306 pushed by the tested proportional valve electromagnet is fitted with the duration of continuously applying the frequency response characteristic test electrical signal to the tested proportional valve electromagnet as a time-force curve, and the frequency response characteristic of the tested proportional valve electromagnet is tested. As shown in the following figure, Figure 8 the duration of continuously applying the current signal of 1.0 A to the tested proportional valve electromagnet at the position of 1.25 mm on the positive side of the zero point of the high-precision grating ruler 310 is fitted as a time-force curve, the frequency response characteristic of the frequency, output force amplitude and phase of the tested proportional valve electromagnet is represented by the time-force curve, and the transient performance index of the tested proportional valve electromagnet is obtained.

[0190] Finally, the displacement-force curve, the electrical signal-force curve and the time-force curve of the tested proportional valve electromagnet are generated to generate a test report of the proportional valve electromagnet.

[0191] The following points need to be explained:

[0192] (1) The drawings of the embodiments of the present application only relate to the structures involved in the embodiments of the present application, and other structures can be referred to the general design.

[0193] (2) In the drawings used to describe the embodiments of the present application, the thickness of a layer or region is exaggerated or reduced for clarity, i.e., the drawings are not drawn according to the actual scale. It can be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, it can be "directly" on or under the other element or there can be an intermediate element.

[0194] (3) In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0195] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of performance testing a displacement sensor, characterized by, The displacement sensor is tested for performance by using a device suitable for performance test of different types of sensors; The device comprises a box body and a table fixed on the box body, and an executing mechanism is arranged on the table; The executing mechanism comprises at least a sensor mounting head, a standard force sensor and a high-precision grating ruler; The sensor mounting head is used for mounting a measured displacement sensor or a measured proportional valve electromagnet, and is configured to move in six degrees of freedom to adjust the position of the measured displacement sensor or the measured proportional valve electromagnet; The standard force sensor is configured to move linearly towards or away from the sensor mounting head; The high-precision grating ruler is arranged on the table and is parallel to the linear movement direction of the standard force sensor; The performance test method comprises the following steps: S1, powering on the device; Starting the device suitable for performance test of different types of sensors; S2, mounting the measured displacement sensor; Mounting the measured displacement sensor on the sensor mounting head, adjusting the position of the measured displacement sensor in six degrees of freedom, and making the telescopic rod of the measured displacement sensor in the same straight line with the standard force sensor; S3, setting the safety stroke of the standard force sensor; Driving the standard force sensor to move towards the sensor mounting head to make the standard force sensor press the telescopic rod of the measured displacement sensor; Collecting the first position data of the high-precision grating ruler when the telescopic rod of the measured displacement sensor contacts the standard force sensor, and the second position data of the high-precision grating ruler when the telescopic rod of the measured displacement sensor is at the compression limit position; Recording the first position data and the second position data, and taking the distance between the first position data and the second position data as the safety stroke of the standard force sensor; S4, setting the zero point of the high-precision grating ruler; Taking half of the difference between the first position data and the second position data as the zero point of the high-precision grating ruler; S5, performance test; Selecting the positive stroke range and the negative stroke range of the standard force sensor on both sides of the zero point of the high-precision grating ruler; Driving the standard force sensor to move linearly towards or away from the sensor mounting head within the positive stroke range and the negative stroke range of the standard force sensor to make the standard force sensor press the telescopic rod of the measured displacement sensor; Collecting different position data of the high-precision grating ruler within the positive stroke range and the negative stroke range of the standard force sensor, and the corresponding electrical signals of the measured displacement sensor under different position data of the high-precision grating ruler; Fitting the different position data of the high-precision grating ruler and the corresponding electrical signals of the measured displacement sensor under different position data of the high-precision grating ruler into an electrical signal-displacement curve; Taking the slope of the electrical signal-displacement curve as the sensitivity of the measured displacement sensor.

2. The performance test method of claim 1, wherein, A guide rail and a linear motor are fixed on the table; A sliding block is slidably mounted on the guide rail and connected with the output end of the linear motor; A protection bracket is fixed on the sliding block, an installation bracket is fixedly mounted on the protection bracket, and the standard force sensor is fixed on the installation bracket.

3. The performance testing method of claim 2, wherein, The slider is fixed with a scanner; when the standard force sensor moves linearly towards or away from the sensor mounting head, the scanner scans the high-precision grating ruler to trigger the high-precision grating ruler to generate position data.

4. The performance testing method of claim 1, wherein, The table top is fixed with a multi-degree-of-freedom adjustment table, the multi-degree-of-freedom adjustment table is fixed with a clamping mechanism, and the clamping mechanism is fixed with the sensor mounting head; The multi-degree-of-freedom adjustment table moves in six degrees of freedom, driving the sensor mounting head to move in six degrees of freedom, thereby adjusting the position of the measured displacement sensor or the measured proportional valve electromagnet.

5. The performance testing method of claim 1, wherein, The box is configured with a control system, and the control system at least includes an electrical measurement module, a motion controller, and a programmable power supply / drive circuit; The electrical measurement module is used to collect the electrical signal of the measured displacement sensor, the force signal of the standard force sensor, and the position data of the high-precision grating ruler; The motion controller is used to drive the standard force sensor to move linearly towards or away from the sensor mounting head; The programmable power supply / drive circuit is used to apply an electrical signal to the measured proportional valve electromagnet.

6. The performance testing method of claim 5, wherein, The electrical measurement module adopts a high-precision 7 ½ bit table type multimeter.

7. The performance testing method of claim 5, wherein, The control system further includes a driver, and the motion controller is connected to the driver; The motion controller sends a control signal to the driver to drive the standard force sensor to move linearly towards or away from the sensor mounting head.

8. The performance testing method of claim 5, wherein, The control system further includes a signal conditioning circuit, a GPIB communication interface, and a power supply module; The signal conditioning circuit is connected to the electrical measurement module, and the signal conditioning circuit is used to condition the signals collected by the electrical measurement module; The GPIB communication interface is connected to the signal conditioning circuit, the motion controller, and the programmable power supply / drive circuit; The GPIB communication interface is used to respectively communicate the signal conditioning circuit, the motion controller, and the programmable power supply / drive circuit with an upper computer.

9. A method of testing the performance of a proportional valve electromagnet, characterized by, A device suitable for performance testing of different types of sensors is used to test the performance of the displacement sensor. The device includes a box and a table top fixed on the box, and the table top is provided with an execution mechanism; The execution mechanism at least includes a sensor mounting head, a standard force sensor, and a high-precision grating ruler; The sensor mounting head is used to mount a measured displacement sensor or a measured proportional valve electromagnet; and the sensor mounting head is configured to move in six degrees of freedom to adjust the position of the measured displacement sensor or the measured proportional valve electromagnet; The standard force sensor is configured to move linearly towards or away from the sensor mounting head; The high-precision grating ruler is arranged on the table top, and the direction of linear motion of the high-precision grating ruler is parallel to the direction of linear motion of the standard force sensor; The performance testing method includes the following method steps: S1, power on the device: Start the device suitable for performance testing of different types of sensors; S2, measured proportional valve electromagnet installation: Install the measured proportional valve electromagnet on the sensor mounting head, adjust the position of the measured displacement sensor in six degrees of freedom, and make the measured proportional valve electromagnet and the standard force sensor in the same straight line; and adjust the standard force sensor and the measured proportional valve electromagnet in contact; S3, set the safety stroke of the standard force sensor: According to the rated parameters of the measured proportional valve electromagnet, an electric signal is applied to the measured proportional valve electromagnet, so that the force generated by the measured proportional valve electromagnet drives the standard force sensor to move away from the sensor mounting head; Collect the third position data of the high-precision grating ruler when the measured proportional valve electromagnet contacts the standard force sensor; and the fourth position data of the high-precision grating ruler when the force generated by the measured proportional valve electromagnet is equal to the rated force; Record the third position data and the fourth position data, and take the distance between the third position data and the fourth position data as the safety stroke of the standard force sensor; S4, set the zero point of the high-precision grating ruler: Take 30%-50% of the rated parameters of the measured proportional valve electromagnet, apply an electric signal to the measured proportional valve electromagnet, so that the force generated by the measured proportional valve electromagnet drives the standard force sensor to move away from the sensor mounting head; Collect the force signal of the standard force sensor driven by the measured proportional valve electromagnet until the force signal of the standard force sensor driven by the measured proportional valve electromagnet reaches the preset threshold value; When the force signal of the standard force sensor driven by the measured proportional valve electromagnet reaches the preset threshold value, the corresponding position data of the high-precision grating ruler is collected as the zero point of the high-precision grating ruler; S5, performance test: Apply different electric signals to the measured proportional valve electromagnet, so that the force generated by the measured proportional valve electromagnet drives the standard force sensor to move away from the sensor mounting head; Collect different force signals of the standard force sensor, and the position data of the high-precision grating ruler corresponding to different force signals of the standard force sensor; Fit the different force signals of the standard force sensor and the position data of the high-precision grating ruler corresponding to the different force signals of the standard force sensor into a displacement-force curve to test the displacement-force characteristics of the measured proportional valve electromagnet; Fit the different force signals of the standard force sensor and the different electric signals applied to the measured proportional valve electromagnet into an electric signal-force curve to test the electric signal-force characteristics of the measured proportional valve electromagnet.

10. The performance testing method of claim 9, wherein, In step S5, the frequency response characteristics of the measured proportional valve electromagnet are also tested, including the following method steps: Within the safety stroke range of the standard force sensor on both sides of the zero point of the high-precision grating ruler, the position data of the high-precision grating ruler is arbitrarily selected as the frequency response characteristic test position; The electric signal of the measured proportional valve electromagnet corresponding to the frequency response characteristic test position is taken as the frequency response characteristic test electric signal; The change value of the force signal of the standard force sensor driven by the measured proportional valve electromagnet is collected by continuously applying the frequency response characteristic test electric signal to the measured proportional valve electromagnet; Fit the change value of the force signal of the standard force sensor driven by the measured proportional valve electromagnet and the duration of continuously applying the frequency response characteristic test electric signal to the measured proportional valve electromagnet into a time-force curve to test the frequency response characteristics of the measured proportional valve electromagnet.

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