Solenoid valve characteristic test method, electronic equipment, storage medium and computer program product

Abstract

The invention belongs to the technical field of vehicles, and provides an electromagnetic valve characteristic testing method, electronic equipment, a storage medium and a computer program product. The electromagnetic valve is connected with the hydraulic system, the hydraulic system is provided with a piston cavity, the two ends of the electromagnetic valve are connected with the two ends of the piston cavity in a one-to-one correspondence mode, and a displacement sensor is arranged outside the piston cavity and used for detecting piston displacement; the inlet flow pressure of the electromagnetic valve is controlled to be a first preset value, the current is controlled to be an initial value, and first displacement of a piston detected by a displacement sensor is obtained; the current value of the electromagnetic valve is adjusted to be a first current value, and second displacement of the piston detected by the displacement sensor is obtained; determining the electromagnetic valve flow according to the first displacement, the second displacement and the cross section area of the piston; and obtaining the flow characteristics of the electromagnetic valve by obtaining the electromagnetic valve flow corresponding to different current values. According to the invention, the electromagnetic valve is installed in the hydraulic system, the difference of the electromagnetic valve in the single body test and the hydraulic system is identified and eliminated, and more accurate electromagnetic valve characteristics are obtained.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a solenoid valve characteristic testing method, electronic equipment, storage medium, and computer program product. Background Art

[0002] The two control parameters of shift pressure and shift flow play a vital role in the shift process of automatic transmission and multi-speed hybrid transmission. The shift flow mainly controls the moving speed of the shift piston. By calibrating the shift flow control parameters, the noise during the shift process can be better controlled. The shift flow is generally controlled by the shift flow solenoid valve in the hydraulic system. The characteristics of the solenoid valve are very important for the shift calibration.

[0003] In the past, the method for obtaining the characteristics of the gear shift flow solenoid valve was to test it on the solenoid valve itself. However, whether from a theoretical analysis or from the actual performance of gear shifting, there are certain differences between the characteristics of the solenoid valve itself and the characteristics when it is installed in the system, which cannot support the gear shift calibration to quickly and accurately obtain the calibration parameters. However, when the solenoid valve is installed in the hydraulic system, since the outlet of the solenoid valve is connected to the gear shift piston chamber, it is a closed system and the characteristics of the solenoid valve cannot be directly tested. Summary of the invention

[0004] The technical problem to be solved by the present application is to identify and eliminate the differences in the performance of the solenoid valve in the solenoid valve unit test and the hydraulic system, obtain the actual characteristics of the solenoid valve more accurately, and provide data support for gear shift calibration.

[0005] In order to solve the above problems, the present application provides a method for testing the characteristics of a solenoid valve, wherein the solenoid valve is connected to a hydraulic system, the hydraulic system has a piston chamber, two ends of the solenoid valve are connected to two ends of the piston chamber in a one-to-one correspondence, a piston is provided in the piston chamber, and a displacement sensor is provided outside the piston chamber, and the displacement sensor is used to detect the displacement of the piston; the method comprises:

[0006] The inlet flow pressure of the control solenoid valve reaches a first preset value, the current of the control solenoid valve is an initial value, and a first displacement of the piston detected by the displacement sensor is obtained; the current value of the solenoid valve is adjusted to a first current value, and a second displacement of the piston detected by the displacement sensor is obtained; the flow rate of the solenoid valve is determined according to the first displacement, the second displacement and the known cross-sectional area of ​​the piston; the flow rate of the solenoid valve corresponding to different current values ​​is obtained by adjusting the current value of the solenoid valve, and the flow characteristic of the solenoid valve is obtained.

[0007] In one embodiment, the flow rate of the solenoid valve is determined based on the first displacement, the second displacement and the known cross-sectional area of ​​the piston, including: obtaining the time value for the piston to change from the first displacement to the second displacement; determining the movement speed of the piston based on the first displacement, the second displacement and the time value; determining the flow rate of the solenoid valve based on the movement speed of the piston and the known cross-sectional area of ​​the piston.

[0008] In one embodiment, before adjusting the current value of the solenoid valve to the first current value, the method also includes: increasing the current of the solenoid valve until the position of the piston changes, and recording the current value at this time as the opening current; controlling the current of the solenoid valve to return to the initial value so that the piston returns to the initial position; and determining the first current value based on the opening current.

[0009] In one embodiment, the method further includes: recording the time difference from when the current of the solenoid valve changes to when the position of the piston starts to change when the current of the solenoid valve is at different values.

[0010] In one embodiment, the method further includes: adjusting the inlet flow pressure of the solenoid valve to obtain the flow characteristics of the solenoid valve when the inlet flow pressure of the solenoid valve is at different values.

[0011] In one embodiment, the method further includes: adjusting the inlet lubricating oil temperature of the solenoid valve, and obtaining the flow characteristics of the solenoid valve when the inlet lubricating oil temperature of the solenoid valve is at different values.

[0012] In one embodiment, the flow rate of the solenoid valve corresponding to different current values ​​is obtained by adjusting the current value of the solenoid valve, thereby obtaining the flow characteristics of the solenoid valve, including: adjusting the current value of the solenoid valve multiple times according to a preset current gradient; obtaining the flow rate of the solenoid valve corresponding to different current values, thereby obtaining the flow characteristics of the solenoid valve.

[0013] In one embodiment, the solenoid valve is a bidirectional solenoid valve, and the first side of the solenoid valve is connected to the first end of the piston chamber through a first pipeline; the second side of the solenoid valve is connected to the second end of the piston chamber through a second pipeline; when the current of the solenoid valve increases to the opening current, the first side of the solenoid valve opens, and the lubricating oil delivered to the inlet of the solenoid valve fills the first end of the piston chamber; when the current of the solenoid valve decreases to a preset current, the second side of the solenoid valve opens, and the lubricating oil delivered to the inlet of the solenoid valve fills the second end of the piston chamber.

[0014] An embodiment of the present application provides an electronic device comprising: a processor; and a memory for storing instructions executable by the processor; wherein the processor is configured to execute the above-mentioned solenoid valve characteristic testing method.

[0015] An embodiment of the present application provides a computer-readable storage medium, which stores a computer program. The computer program can be executed by a processor to complete the above-mentioned solenoid valve characteristic testing method.

[0016] An embodiment of the present application provides a computer program product, including a computer program / instruction, which implements the above-mentioned solenoid valve characteristic testing method when executed by a processor.

[0017] The technical solution provided in the above-mentioned embodiments of the present application controls the inlet flow pressure and current value of the solenoid valve to obtain the piston displacement detected by the displacement sensor under different current values, thereby obtaining the flow of the solenoid valve corresponding to different current values, and deriving the characteristics of the solenoid valve, so as to identify and eliminate the differences in the performance of the solenoid valve in the solenoid valve unit test and the hydraulic system, and obtain more accurate actual characteristics of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings required for use in the embodiments of the present application are briefly introduced below.

[0019] Figure 1 A structural schematic diagram of a solenoid valve characteristic test provided in an embodiment of the present application installed in a hydraulic system for characteristic testing;

[0020] Figure 2 A flow chart of a solenoid valve characteristic testing method provided in an embodiment of the present application;

[0021] Figure 3 for Figure 2 Detailed flowchart of step S230 in the corresponding embodiment;

[0022] Figure 4 A detailed flowchart of a solenoid valve characteristic testing method provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0024] The above drawings include the following reference numerals:

[0025] 1- Solenoid valve;

[0026] 2- Entrance;

[0027] 3-first pipeline, 4-second pipeline;

[0028] 5-piston chamber, 6-piston;

[0029] 7-Displacement sensor;

[0030] 500-Electronic equipment

[0031] 501- memory, 502- processor. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0033] Similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0034] Figure 1 The present invention provides a method for testing the characteristics of a solenoid valve 1, such as Figure 1 As shown, the solenoid valve 1 is connected to the hydraulic system to test the characteristics of the solenoid valve 1. The hydraulic system has a piston chamber 5. The two ends of the solenoid valve 1 are connected to the two ends of the piston chamber 5 in a one-to-one correspondence. The piston chamber 5 has a piston 6, and a displacement sensor 7 is provided outside the piston chamber 5. In one embodiment, the displacement sensor 7 can obtain the displacement of the piston 6 by detecting the change in the magnetic field strength of the piston 6.

[0035] In one embodiment, the solenoid valve 1 is a two-way solenoid valve, and the lubricating oil is input into the solenoid valve 1 through the inlet 2. The first side (e.g., the left side) of the solenoid valve 1 is connected to the first end (the left part) of the piston chamber 5 through the first pipeline 3; the second side (e.g., the right side) of the solenoid valve 1 is connected to the second end (the right part) of the piston chamber 5 through the second pipeline 4. The first pipeline 3 and the second pipeline 4 are used to input the lubricating oil in the solenoid valve 1 into the piston chamber 5.

[0036] When the current of the solenoid valve 1 increases to the opening current (for example, 950mA), the first side of the solenoid valve 1 opens, and the lubricating oil delivered by the inlet 2 of the solenoid valve 1 fills the first end of the piston chamber 5, causing the piston 6 to move toward the second end of the piston chamber 5; when the current of the solenoid valve 1 decreases to the preset current (for example, 800mA), the second side of the solenoid valve 1 opens, and the lubricating oil delivered by the inlet 2 of the solenoid valve 1 fills the second end of the piston chamber 5, causing the piston 6 to move toward the first end of the piston chamber 5.

[0037] Figure 2 A flow chart of a method for testing the characteristics of a solenoid valve 1 provided in an embodiment of the present application. Figure 3 A schematic diagram of specific steps of the electromagnetic valve 1 characteristic testing method provided in the embodiment of the present application is shown in FIG. Figure 2 and Figure 3 As shown, the method includes the following steps S210-S240.

[0038] Step S210: controlling the flow pressure of the inlet 2 of the solenoid valve 1 to reach a first preset value, controlling the current of the solenoid valve 1 to be an initial value, and obtaining a first displacement of the piston 6 detected by the displacement sensor 7.

[0039] Specifically, a displacement sensor 7 is arranged at the position of the piston chamber 5 on the hydraulic system. The displacement sensor 7 is non-contacted with the piston chamber 5. The displacement sensor 7 measures the displacement of the piston 6 by the change of the magnetic field strength near the piston chamber 5. The displacement sensor 7 provided on the hydraulic system can also be used. The hydraulic system is installed on the test bench. The solenoid valve 1 has an inlet 2. The test bench provides lubricating oil to the inlet 2 of the solenoid valve 1. The flow rate of the provided lubricating oil is greater than the maximum flow rate required by the solenoid valve 1 to ensure that the lubricating oil can eventually flow out of the solenoid valve 1. The flow pressure of the inlet 2 of the solenoid valve 1 is controlled to reach a first preset value, wherein the first preset value is the value of the pressure to be tested; the solenoid valve 1 is energized, and the current of the solenoid valve 1 is controlled to be the initial value I0. The initial value can be considered as the current size at which the solenoid valve core will not open. In one embodiment, the initial value I0 can be a value between 800mA and 950mA.

[0040] At this time, the valve core of the solenoid valve 1 is in a closed state, and the shift piston 6 is placed in the initial position. At this time, the piston 6 may be in any position. The first displacement D of the piston 6 detected by the displacement sensor 7 is obtained. s , where the first displacement D s It is used to characterize the position of the piston 6 corresponding to the initial value of the current. This position can be a relative position, so it is represented by displacement, for example, it can be the displacement relative to the left end of the piston chamber 5, the displacement relative to the center of the piston chamber 5, and so on.

[0041] Step S220: adjusting the current value of the solenoid valve 1 to a first current value, and obtaining a second displacement of the piston 6 detected by the displacement sensor 7.

[0042] The second displacement is used to represent the position of the piston 6 when the current value of the solenoid valve 1 is the first current value, which can be recorded as D e Similarly, this position can also be a relative position, so it is represented by displacement. In other embodiments, the first displacement can be 0, and the second displacement can also be the displacement of the current position of the piston relative to the initial position; wherein the magnitude of the first current value can be the magnitude of the current that causes the piston 6 to change position, and can be set according to the current value corresponding to when the piston 6 starts to move.

[0043] In one embodiment, before adjusting the current value of the solenoid valve 1 to the first current value, the method for testing the characteristics of the solenoid valve 1 further includes: slowly increasing the current of the solenoid valve 1 until the position of the piston 6 changes, indicating that the valve core of the solenoid valve 1 is opened at this time, and recording the current value at this time as the opening current I s ; Control the current of solenoid valve 1 back to the initial value, so that piston 6 returns to the initial position; according to the opening current I s , set a certain current gradient △I, the current gradient can be selected according to the needs, determine the first current value, the first current value is the opening current plus the current gradient, that is, I s +△I.

[0044] After the current of the solenoid valve 1 is controlled to be the first current value, the position of the piston 6 changes from the initial position to the final position, and the second displacement D of the piston 6 detected by the displacement sensor 7 is obtained. e , and then reset the current valve current to the initial value I0.

[0045] Step S230: According to the first displacement D s , the second displacement D e And the known cross-sectional area S of the piston 6 determines the flow rate Q1 of the solenoid valve 1.

[0046] In one embodiment, if Figure 3 As shown, the above step S230 specifically includes the following steps S231-S233:

[0047] Step S231: Obtain the displacement D of the piston 6 from the first s Change to the second displacement D e The time value t1;

[0048] Step S232: According to the first displacement D s , the second displacement D e And the time value t1, determine the moving speed V of the piston 6, V = (D e –D s ) / t1;

[0049] Step S233: Determine the flow rate Q1 of the lubricating oil of the solenoid valve 1 according to the moving speed of the piston 6 and the known cross-sectional area S of the piston 6, Q1=(D e –D s )*S / t1. The cross-sectional area S of the piston 6 can be calculated in advance according to the structure of the hydraulic system.

[0050] Step S240: By adjusting the current value of the solenoid valve 1 , the flow rate of the solenoid valve 1 corresponding to different current values ​​is obtained, and the flow rate characteristic of the solenoid valve 1 is obtained.

[0051] In one embodiment, the above step S240 specifically includes:

[0052] According to the preset current gradient △I, the current value of solenoid valve 1 is adjusted multiple times, and the current value of solenoid valve 1 is controlled to be I s +n△I, where n is a positive integer, until the current reaches the maximum allowable current of the solenoid valve 1; calculate the flow rate Q of the solenoid valve 1 corresponding to different current values n , draw the QI characteristic curve and obtain the flow characteristics of solenoid valve 1.

[0053] The above embodiment controls the flow pressure and current value of the inlet 2 of the solenoid valve 1 to obtain the displacement of the piston 6 detected by the displacement sensor 7 under different current values, and obtains the displacement of the piston 6 from the known cross-sectional area S of the piston 6 and the first displacement D s and the second displacement D e The difference between the current and the time value t1 is used to obtain the flow rate of the solenoid valve 1 corresponding to different current values, and the characteristics of the solenoid valve 1 are obtained. The difference caused by installing the solenoid valve 1 in the hydraulic system after the characteristics of the solenoid valve 1 obtained in the solenoid valve 1 unit test is eliminated can obtain more accurate actual characteristics of the solenoid valve 1.

[0054] In one embodiment, the method for testing the characteristics of the solenoid valve 1 provided in the above embodiment of the present application further includes: recording the time difference Δt from the change of the current of the solenoid valve 1 to the start of the change of the position of the piston 6 when the current of the solenoid valve 1 is at different values n , the time difference at this time is the flow response time when the current of the solenoid valve is at different values.

[0055] In one embodiment, the solenoid valve 1 characteristic testing method provided in the above embodiment of the present application further includes: adjusting the flow pressure of the inlet 2 of the solenoid valve 1, and obtaining the flow characteristics of the solenoid valve 1 when the flow pressure of the inlet 2 of the solenoid valve 1 is at different values.

[0056] Specifically, in order to determine the influence of the flow pressure at the inlet 2 of the solenoid valve 1 on the characteristics of the solenoid valve, the size of the first preset value in step S210 can be changed, and then the above steps S210-S240 can be repeated to obtain the QI characteristic curve when the inlet flow pressure of the solenoid valve is at different values.

[0057] In one embodiment, the solenoid valve 1 characteristic testing method provided in the above embodiment of the present application also includes: adjusting the lubricating oil temperature at the inlet 2 of the solenoid valve 1, and obtaining the flow characteristics of the solenoid valve 1 when the lubricating oil temperature at the inlet 2 of the solenoid valve 1 is at different values.

[0058] In order to determine the influence of lubricating oil temperature on the solenoid valve characteristics, the lubricating oil temperature at the inlet 2 of the solenoid valve 1 may be adjusted, and then the above steps S210 to S240 are repeated to obtain QI characteristic curves when the lubricating oil is at different values.

[0059] Figure 4 Detailed flow chart of a method for testing the characteristics of a solenoid valve 1 provided in an embodiment of the present application, such as Figure 4 As shown, the method comprises the following steps:

[0060] S401: Set the lubricating oil temperature to 30°C, the oil circuit pressure of inlet 2 of solenoid valve 1 to 10 bar, and the oil circuit flow of inlet 2 to 10 L / min, to ensure that the flow of inlet 2 of solenoid valve 1 is greater than the maximum flow required by solenoid valve 1.

[0061] S402: At this time, the initial position of the piston 6 is in the middle position, the current of the control solenoid valve 1 is the initial value, and the piston is in the initial position, that is, the first displacement position D s .

[0062] S403: Set the current gradient to 1mA, and keep each current gradient for more than 2s. Each time, slowly increase the current with a gradient of 1mA, and observe the position of the piston 6 in real time until the piston position changes, indicating that the valve core of the solenoid valve 1 is open. When the current increases to a certain level, the left side of the valve core of the solenoid valve 1 is opened. At this time, lubricating oil flows out of the first pipeline 3, filling the left side of the piston chamber 5, causing the piston 6 to move to the right side of the piston chamber 5. When the piston 6 position begins to move to the right side of the piston chamber 5, the current value at this time is recorded as the current value I when the valve core of the solenoid valve is opened. s In one embodiment, the current value for causing the piston 6 to start moving is 900 mA.

[0063] S404: Set the current value to 0mA. As the current value of the solenoid valve 1 decreases from the initial value, the right side of the valve core of the solenoid valve 1 opens. At this time, lubricating oil flows out of the second pipeline 4, filling the right side of the piston chamber 5, so that the piston 6 moves to the left side of the piston chamber 5. Record the position of the piston 6 at this time, that is, the first displacement is 2mm, and then set the current to the initial value to keep the piston 6 on the left side of the piston chamber 5 unchanged.

[0064] S405: Set the first current value to 925 mA until the piston 6 moves from the left side of the piston chamber 5 to the right side of the piston chamber 5, and set the current to the initial value. Record the motion curve of the piston 6, the position of the piston 6 at the second end of the piston chamber 5 is the second displacement of the piston 6, the second displacement is recorded as 18 mm, the movement time of the piston 6 from the first displacement to the second displacement is 0.8 s, and the time from the current being emitted to the change in the position of the piston 6 is 0.13 s.

[0065] S406: According to V=(D e –D s) / t1, it can be calculated that the movement speed of piston 6 is (18-2) / 0.8=20mm / s. According to the hydraulic system structure, the cross-sectional area of ​​piston 6 is 500mm 2 , according to Q1=(D e –D s )*S / t1 can be used to calculate the lubricating oil flow rate to be 20*500=10000mm / s=0.6L / min.

[0066] S407: Therefore, it can be concluded that when the oil temperature at the inlet 2 of the solenoid valve 1 is 30°C and the pressure is 10 bar, when the current value of the solenoid valve 1 is 925 mA, the outlet flow rate of the shift flow control solenoid valve 1 is 0.6 L / min, and the response time is 0.13 s.

[0067] S408: Referring to the above steps, since the opening current is 900mA, the current value near 900mA is discarded, and the current value of solenoid valve 1 is set to 950mA~1500mA respectively. The characteristics of solenoid valve 1 under different current values ​​can be obtained respectively, and the characteristics of solenoid valve 1 when the current value is 0mA~800mA can also be obtained.

[0068] S409: Changing the lubricating oil pressure and oil temperature of the inlet 2 of the solenoid valve 1 and repeating the above steps can obtain the characteristics of the solenoid valve 1 under different conditions.

[0069] Figure 5 The present application also provides a schematic diagram of the structure of an electronic device 500. Figure 5 As shown, the electronic device includes: a processor 502; and a memory 501 for storing instructions executable by the processor 502; wherein the processor is configured to execute the electromagnetic valve 1 characteristic test method of the above embodiment.

[0070] The embodiment of the present application further provides a computer-readable storage medium, the storage medium stores a computer program, and the computer program can be executed by a processor to complete the solenoid valve 1 characteristic testing method of the above embodiment.

[0071] The embodiment of the present application also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the solenoid valve characteristic testing method provided in the embodiment of the present application.

[0072] In several embodiments provided in the present application, the disclosed device and method can also be implemented in other ways. The device embodiment described above is merely schematic, and each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and a part of a module, a program segment or a code includes one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a sequence different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0073] In addition, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0074] If the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0075] The above embodiments are only used to illustrate the technical solutions of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above embodiments are only used to illustrate the technical solutions of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A solenoid valve characteristic testing method, characterized in that: The solenoid valve is connected to a hydraulic system, the hydraulic system has a piston chamber, the two ends of the solenoid valve are connected to the two ends of the piston chamber in a one-to-one correspondence, the piston chamber has a piston, and a displacement sensor is provided outside the piston chamber, and the displacement sensor is used to detect the displacement of the piston; the method includes: Controlling the inlet flow pressure of the solenoid valve to reach a first preset value, controlling the current of the solenoid valve to be an initial value, and obtaining a first displacement of the piston detected by the displacement sensor; Adjusting the current value of the solenoid valve to a first current value, and obtaining a second displacement of the piston detected by the displacement sensor; determining a flow rate of the solenoid valve according to the first displacement, the second displacement and a known cross-sectional area of ​​the piston; By adjusting the current value of the solenoid valve, the flow rate of the solenoid valve corresponding to different current values ​​is obtained, and the flow rate characteristic of the solenoid valve is obtained.

2. The solenoid valve characteristic testing method according to claim 1, characterized in that: Determining the flow rate of the solenoid valve according to the first displacement, the second displacement and the known cross-sectional area of ​​the piston includes: Acquire the time value of the piston changing from the first displacement to the second displacement; Determining a moving speed of the piston according to the first displacement, the second displacement and the time value; The flow rate of the solenoid valve is determined according to the moving speed of the piston and the known cross-sectional area of ​​the piston.

3. The solenoid valve characteristic testing method according to claim 1, characterized in that: Before adjusting the current value of the solenoid valve to the first current value, the method further includes: Increasing the current of the solenoid valve until the position of the piston changes, and recording the current value at this time as the opening current; Controlling the current of the solenoid valve to return to the initial value, so that the piston returns to the initial position; The first current value is determined according to the start-up current.

4. The solenoid valve characteristic testing method according to claim 1, characterized in that: Also includes: The time difference from when the current of the solenoid valve changes to when the position of the piston starts to change is recorded when the current of the solenoid valve is at different values.

5. The solenoid valve characteristic testing method according to claim 1, characterized in that: Also includes: The inlet flow pressure of the solenoid valve is adjusted to obtain the flow characteristics of the solenoid valve when the inlet flow pressure of the solenoid valve is at different values.

6. The solenoid valve characteristic testing method according to claim 1, characterized in that: Also includes: The inlet lubricating oil temperature of the solenoid valve is adjusted to obtain the flow characteristics of the solenoid valve when the inlet lubricating oil temperature of the solenoid valve is at different values.

7. The solenoid valve characteristic testing method according to claim 1, characterized in that: By adjusting the current value of the solenoid valve, the flow rate of the solenoid valve corresponding to different current values ​​is obtained, and the flow rate characteristics of the solenoid valve are obtained, including: According to a preset current gradient, adjusting the current value of the solenoid valve multiple times; The flow rate of the solenoid valve corresponding to different current values ​​is obtained to obtain the flow rate characteristic of the solenoid valve.

8. The solenoid valve characteristic testing method according to claim 1, characterized in that: The solenoid valve is a two-way solenoid valve, wherein the first side of the solenoid valve is connected to the first end of the piston chamber through a first pipeline; the second side of the solenoid valve is connected to the second end of the piston chamber through a second pipeline; when the current of the solenoid valve increases to an opening current, the first side of the solenoid valve opens, and the lubricating oil delivered through the inlet of the solenoid valve fills the first end of the piston chamber; when the current of the solenoid valve decreases to a preset current, the second side of the solenoid valve opens, and the lubricating oil delivered through the inlet of the solenoid valve fills the second end of the piston chamber.

9. An electronic device, characterized in that: The electronic device comprises: processor; a memory for storing processor-executable instructions; Wherein, the processor is configured to execute the solenoid valve characteristic testing method described in any one of claims 1-8.

10. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program can be executed by a processor to complete the solenoid valve characteristic testing method described in any one of claims 1-8.

11. A computer program product, characterized in that It includes a computer program / instruction, which, when executed by a processor, implements the solenoid valve characteristic testing method described in any one of claims 1-8.

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