Electromagnetic valve testing device

Abstract

The utility model provides an electromagnetic valve testing device which is used for detecting the minimum opening current of an electromagnetic valve. The fluid driving module is used for being in fluid connection with a solenoid valve to be detected and driving fluid to pass through the solenoid valve; the pressure difference determining module is used for determining the pressure difference between the two ends of the solenoid valve when the fluid passes through the solenoid valve; the current output module is used for generating corresponding opening current according to the pressure difference between the two ends of the electromagnetic valve and transmitting the opening current to the electromagnetic valve so as to control the opening of the electromagnetic valve, and the current determination module is in communication connection with the current output module. And the current determination module is used for determining the opening current generated by the current output module when the pressure difference between the two ends of the electromagnetic valve is zero as the minimum opening current of the electromagnetic valve, and aims to determine the minimum opening current of the electromagnetic valve.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic valve testing, in particular to an electromagnetic valve testing device. Background Art

[0002] As the proportion of wire-controlled chassis applications increases, and the new technology One box has advantages in many aspects such as space occupied by parts, weight, cost and energy recovery efficiency, the application of One box in automobile chassis continues to grow. In actual application scenarios, the various solenoid valves of One box cooperate with each other to meet different driving needs. PSV (Pressure Safety Valve solenoid valve) is a normally closed type of switch solenoid valve. During operation, the PSV valve is first opened with a larger current (opening current), and then a smaller hold current can be used to keep the solenoid valve in a normally open state.

[0003] A test device is needed to know the current opening current so as to match the appropriate current according to the application needs. In particular, it is necessary to test the minimum current that can open the PSV valve, that is, the minimum opening current. If the opening current is too small, the PSV will not be able to open. If the opening current is too large, the coil heating and energy loss will increase, and even damage the coil. The existing technology is limited by the conditions, and it is difficult to test the minimum opening current on the whole vehicle. Now the laboratory hydraulic system bench is used to test the minimum opening current of different back pressures, which can provide a set of basic data for the calibration team, effectively improving the calibration efficiency and precise control of the solenoid valve in the chassis wire control software of the whole vehicle. Utility Model Content

[0004] In view of this, an object of the present invention is to provide a solenoid valve testing device, which is intended to determine the minimum opening current of the solenoid valve.

[0005] The utility model provides a solenoid valve testing device, which is used to detect the minimum opening current of the solenoid valve, including a fluid driving module used to be connected to the solenoid valve fluid to be detected and drive the fluid to pass through the solenoid valve, a pressure difference determining module used to determine the pressure difference at both ends of the solenoid valve when the fluid passes through the solenoid valve, a current output module which is communicatively connected to the pressure difference determining module and is used to generate a corresponding opening current according to the pressure difference at both ends of the solenoid valve and transmit the opening current to the solenoid valve to control the opening of the solenoid valve, and a current determining module which is communicatively connected to the current output module, wherein the current determining module is used to determine the opening current generated by the current output module when the pressure difference at both ends of the solenoid valve is 0 as the minimum opening current of the solenoid valve.

[0006] In one embodiment, the pressure difference determination module includes a first pressure sensor, a second pressure sensor and a pressure value analyzer, the first pressure sensor and the second pressure sensor are used to connect the two ends of the solenoid valve, the first pressure sensor and the second pressure sensor are both connected to the pressure value analyzer, and the pressure value analyzer is connected to the current output module, for collecting the pressure values ​​of the pipelines at both ends of the solenoid valve and outputting a pressure difference signal to the current output module through the pressure value analyzer.

[0007] In one embodiment, the pressure value analyzer includes a data input unit, a calculation module and a data output unit connected in sequence, the first pressure sensor and the second pressure sensor are both connected to the data input unit, and the data output unit is connected to the current output module to transmit the pressure values ​​at both ends of the solenoid valve detected by the first pressure sensor and the second pressure sensor from the data input unit to the calculation module to obtain a pressure difference signal, and then transmit the pressure difference signal to the current output module through the data output unit.

[0008] In one embodiment, a flow meter is further included. The flow meter is arranged between the first pressure sensor and the solenoid valve and is used to measure the flow of the solenoid valve.

[0009] In one embodiment, a display is further included, which is connected to the first pressure sensor, the second pressure sensor and the current output module, and is used to display the first pressure value detected by the first pressure sensor, the second pressure value detected by the second pressure sensor and the current value currently output by the current output module.

[0010] In one embodiment, the fluid drive module includes a drive pump, a hydraulic master cylinder and a fluid storage tank which are fluidically connected in sequence, the solenoid valve is arranged between the hydraulic master cylinder and the fluid storage tank, and the drive pump is used to drive the brake fluid in the hydraulic master cylinder to flow to the fluid storage tank through the solenoid valve.

[0011] In one embodiment, an exhaust valve is further included, and the exhaust valve is arranged between the hydraulic master cylinder and the fluid storage tank.

[0012] In one embodiment, a simulated load box is further included. The simulated load box is arranged on the pipeline between the hydraulic master cylinder and the liquid storage tank and is used to simulate the working state of the automobile chassis.

[0013] In one embodiment, a blocking valve is further included, wherein the blocking valve is disposed on a pipeline between the hydraulic master cylinder and the fluid storage tank and is used to build up pressure for the hydraulic master cylinder.

[0014] In one embodiment, the hydraulic master cylinder is provided with a control valve, and the hydraulic master cylinder is connected to the hydraulic safety valve through the control valve, so as to adjust the flow of brake fluid flowing from the hydraulic master cylinder to the solenoid valve.

[0015] The solenoid valve testing device provided by the utility model connects the solenoid valve to the fluid driving module through the pipeline, so that the hydraulic brake fluid can flow through the solenoid valve along the pipeline, so that the pipelines before and after the solenoid valve have pressure. The pressure at both ends of the solenoid valve is detected and determined by the pressure difference determination module, and the pressure difference at both ends is obtained. After the pressure difference signal is input into the current output module, the current output module can adjust the current size according to the pressure difference result. Therefore, the pressure of the pipelines before and after the solenoid valve is detected and compared according to the pressure difference determination module, the current output by the current output module can be determined, so as to obtain the current size of the opening current of the current solenoid valve in combination with the conventional technical theory in the field. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of a clock solenoid valve testing device according to an embodiment of the utility model. DETAILED DESCRIPTION

[0018] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0020] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0021] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0022] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0023] An embodiment of the utility model provides a solenoid valve testing device for detecting the minimum opening current of a solenoid valve 40, comprising a fluid driving module 10 for being connected to the fluid of the solenoid valve 40 to be detected and driving the fluid to pass through the solenoid valve 40, a pressure difference determination module 20 for determining the pressure difference across the solenoid valve 40 when the fluid passes through the solenoid valve 40, a current output module 30 which is communicatively connected to the pressure difference determination module 20 and is used to generate a corresponding opening current according to the pressure difference across the solenoid valve 40 and transmit the opening current to the solenoid valve 40 to control the opening of the solenoid valve 40, and a current determination module which is communicatively connected to the current output module 30, the current determination module being used to determine the opening current generated by the current output module 30 when the pressure difference across the solenoid valve 40 is 0 as the minimum opening current of the solenoid valve 40.

[0024] Specifically, the current determination module and the current output module are integrated. The pressure difference determination module 20 detects the pressure values ​​of the pipelines at both ends of the solenoid valve 40 and compares the pressure values ​​at both ends of the solenoid valve 40 to obtain the difference in pressure values ​​at both ends. The pressure difference signal is transmitted to the current output module 30, and the current output module 30 can output a preset matching current size to the solenoid valve 40 according to different pressure difference signals.

[0025] According to the general principle of the technical field, it is only necessary to obtain the pressures P1 and P2 at the front and rear ends of the solenoid valve 40 and compare the magnitudes of P1 and P2 to determine whether the solenoid valve 40 is in the open state. Taking P1 as the back pressure (the pressure of the pipeline at the end of the solenoid valve 40 close to the hydraulic master cylinder 11), P2 is the pressure of the pipeline at the end of the solenoid valve 40 close to the liquid storage tank 12. In this embodiment, P1 is first set to 50 bar, and the current output module 30 powers the coil in the solenoid valve 40 with a target current of 1.8 A. The power-on time can generally be 40 ms, or it can be adjusted according to actual development needs, and then the current is reduced to an effective holding current. The current in this process is maintained uninterrupted for 5 minutes, or the holding time is adjusted according to development needs; at this time, the pressure difference determination module 20 detects P1 and P2 of the pipelines before and after the solenoid valve 40, and compares P1 and P2; when P1>P2 or P2 is 0 bar, the current determination module determines that the current output module 30 outputs a first preset current to the solenoid valve 40, and the first preset current cannot open the solenoid valve 40; when P1≤P2, the current determination module determines that the current output module 30 outputs a second preset current to the solenoid valve 40, and the second preset current can open the solenoid valve 40 and keep the solenoid valve 40 in a normally open state. When P1=P2, the current output module 30 outputs the second preset current value to the solenoid valve 40, which is the minimum opening current of the solenoid valve 40.

[0026] In this embodiment, the current output module 30 includes a current controller and a current regulator. The current controller is communicatively connected with the pressure difference determination module 20 and the current regulator to receive the pressure difference signal across the solenoid valve 40 and control the current regulator to adjust the current output to the solenoid valve 40.

[0027] In this embodiment, the pressure difference determination module 20 includes a first pressure sensor 21, a second pressure sensor 22 and a pressure value analyzer 23. The first pressure sensor 21 and the second pressure sensor 22 are used to connect the two ends of the solenoid valve 40. The first pressure sensor 21 and the second pressure sensor 22 are both connected to the pressure value analyzer 23. The pressure value analyzer 23 is connected to the current output module 30, which is used to collect the pressure values ​​of the pipelines at both ends of the solenoid valve 40 and output the pressure difference signal to the current output module 30 through the pressure value analyzer 23.

[0028] In this embodiment, the pressure value analyzer 23 includes a data input unit 231, a calculation module 232 and a data output unit 233 connected in sequence. The first pressure sensor 21 and the second pressure sensor 22 are both connected to the data input unit 231, and the data output unit 233 is connected to the current output module 30 to transmit the pressure values ​​at both ends of the solenoid valve 40 detected by the first pressure sensor 21 and the second pressure sensor 22 from the data input unit 231 to the calculation module 232 to obtain a pressure difference signal, and then transmit the pressure difference signal to the current output module 30 through the data output unit 233.

[0029] In this embodiment, a flow meter is further included. The flow meter is disposed between the first pressure sensor 21 and the solenoid valve 40 and is used to measure the flow of the solenoid valve 40 .

[0030] In this embodiment, a display 50 is further included, and the display 50 is connected to the first pressure sensor 21, the second pressure sensor 22 and the current output module 30, and is used to display the first pressure value detected by the first pressure sensor 21, the second pressure value detected by the second pressure sensor 22, and the current value currently output by the current output module 30. The inspector can intuitively obtain the first pressure value, the second pressure value, and the current magnitude of the current of the electromagnetic valve 40 through the display 50, thereby improving the convenience of inspection.

[0031] In this embodiment, the fluid drive module 10 includes a drive pump, a hydraulic master cylinder 11 and a fluid storage tank 12 which are fluidically connected in sequence, and a solenoid valve 40 is arranged between the hydraulic master cylinder 11 and the fluid storage tank 12. The drive pump is used to drive the brake fluid in the hydraulic master cylinder 11 to flow to the fluid storage tank 12 through the solenoid valve 40.

[0032] In this embodiment, an exhaust valve 70 is also included. The exhaust valve 70 is arranged between the hydraulic master cylinder 11 and the liquid storage tank 12. The exhaust valve 70 is used to exhaust the electromagnetic valve detection device in the electromagnetic valve 40 detector.

[0033] In this embodiment, a simulated load box 60 is also included. The simulated load box 60 is arranged on the pipeline between the hydraulic master cylinder 11 and the liquid storage tank 12 to simulate the working state of the automobile chassis.

[0034] In this embodiment, a blocking valve is also included. The blocking valve is arranged on the pipeline between the hydraulic master cylinder 11 and the liquid storage tank 12 and is used to build up pressure for the hydraulic master cylinder 11 .

[0035] In this embodiment, the hydraulic master cylinder 11 is provided with a control valve, and the hydraulic master cylinder 11 is connected to the hydraulic safety valve through the control valve, which is used to adjust the brake fluid flow from the hydraulic master cylinder 11 to the solenoid valve 40.

[0036] The solenoid valve testing device provided by the utility model connects the solenoid valve 40 to the fluid driving module through the pipeline, so that the hydraulic brake fluid can flow through the solenoid valve 40 along the pipeline, so that the pipelines before and after the solenoid valve 40 have pressure. The pressure difference determination module 20 detects and determines the pressure at both ends of the solenoid valve 40, and obtains the pressure difference at both ends. After the pressure difference signal is input into the current output module 30, the current output module 30 can adjust the current size according to the pressure difference result. Therefore, by detecting and comparing the pressure of the pipelines before and after the solenoid valve 40 according to the pressure difference determination module 20, the current output by the current output module 30 can be determined, so as to obtain the current size of the opening current of the solenoid valve 40 at the moment by combining the conventional technical theoretical reasoning in this field.

[0037] Method for testing the minimum opening current of solenoid valve 40 at 50 bar back pressure:

[0038] S1, before the test, the solenoid valve 40 and the pipeline are pressurized and exhausted to exhaust the gas in the test system;

[0039] S2, close the blocking valve and build up the pressure to 50 bar through the hydraulic main cylinder of the test bench;

[0040] S3, the target current of 1.8A is applied to the coil of the solenoid valve 40 for 40ms, and then the current is reduced to the effective holding current (the current cannot be interrupted during the whole process) and maintained for 5min (the time can be adjusted according to development requirements). If P2 can be consistent with P1 at 50bar, it proves that when the target current is 1.8A, the solenoid valve 40 can be opened and kept normally open;

[0041] S4, according to the current accuracy requirements in the development process, gradually reduce the target current value, and repeat steps S2 to S4 until P2 cannot be consistent with P1. This current value cannot keep the solenoid valve 40 in the normally open state and cannot be called the opening current. In the test results, the minimum current that can open the solenoid valve 40 to keep it in the normally open state is the minimum opening current of the solenoid valve 40 under a back pressure of 50 bar.

[0042] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the attached claims.

Claims

1. A solenoid valve testing device for detecting the minimum opening current of a solenoid valve (40), characterized in that: The invention comprises a fluid driving module (10) for being connected to the fluid of a solenoid valve (40) to be detected and driving the fluid to pass through the solenoid valve (40), a pressure difference determining module (20) for determining the pressure difference at both ends of the solenoid valve (40) when the fluid passes through the solenoid valve (40), a current output module (30) communicatively connected to the pressure difference determining module (20) for generating a corresponding opening current according to the pressure difference at both ends of the solenoid valve (40) and transmitting the opening current to the solenoid valve (40) to control the opening of the solenoid valve (40), and a current determining module communicatively connected to the current output module (30), wherein the current determining module is used to determine the opening current generated by the current output module (30) when the pressure difference at both ends of the solenoid valve (40) is 0 as the minimum opening current of the solenoid valve (40).

2. The solenoid valve testing device according to claim 1, characterized in that: The pressure difference determination module (20) comprises a first pressure sensor (21), a second pressure sensor (22) and a pressure value analyzer (23); the first pressure sensor (21) and the second pressure sensor (22) are used to connect two ends of the solenoid valve (40); the first pressure sensor (21) and the second pressure sensor (22) are both connected to the pressure value analyzer (23); the pressure value analyzer (23) is connected to the current output module (30) and is used to collect the pressure values ​​of the pipelines at two ends of the solenoid valve (40) and output a pressure difference signal to the current output module (30) through the pressure value analyzer (23).

3. The solenoid valve testing device according to claim 2, characterized in that: The pressure value analyzer (23) comprises a data input unit (231), a calculation module (232) and a data output unit (233) which are connected in sequence, wherein the first pressure sensor (21) and the second pressure sensor (22) are both connected to the data input unit (231), and the data output unit (233) is connected to the current output module (30) so as to transmit the pressure values ​​at both ends of the solenoid valve (40) detected by the first pressure sensor (21) and the second pressure sensor (22) from the data input unit (231) to the calculation module (232) to obtain a pressure difference signal, and then transmit the pressure difference signal to the current output module (30) through the data output unit (233).

4. The solenoid valve testing device according to claim 2, characterized in that: It also includes a flow meter, which is arranged between the first pressure sensor (21) and the electromagnetic valve (40) and is used to measure the flow of the electromagnetic valve (40).

5. The solenoid valve testing device according to claim 2, characterized in that: The device also comprises a display (50), wherein the display (50) is connected to the first pressure sensor (21), the second pressure sensor (22) and the current output module (30), and is used to display a first pressure value detected by the first pressure sensor (21), a second pressure value detected by the second pressure sensor (22) and a current value currently output by the current output module (30).

6. The solenoid valve testing device according to claim 1, characterized in that: The fluid drive module (10) comprises a drive pump, a hydraulic master cylinder (11) and a fluid storage tank (12) which are fluidically connected in sequence, the solenoid valve (40) being arranged between the hydraulic master cylinder (11) and the fluid storage tank (12), and the drive pump being used to drive the brake fluid in the hydraulic master cylinder (11) to flow to the fluid storage tank (12) through the solenoid valve (40).

7. The solenoid valve testing device according to claim 6, characterized in that: It also includes an exhaust valve (70), which is arranged between the hydraulic master cylinder (11) and the liquid storage tank (12).

8. The solenoid valve testing device according to claim 6, characterized in that: It also comprises a simulated load box (60), which is arranged on the pipeline between the hydraulic master cylinder (11) and the liquid storage tank (12) and is used to simulate the working state of the automobile chassis.

9. The solenoid valve testing device according to claim 6, characterized in that: It also comprises a blocking valve, which is arranged on the pipeline between the hydraulic master cylinder (11) and the liquid storage tank (12) and is used to build up pressure for the hydraulic master cylinder (11).

10. The solenoid valve testing device according to claim 6, characterized in that: The hydraulic master cylinder (11) is provided with a control valve, and the hydraulic master cylinder (11) is connected to a hydraulic safety valve through the control valve, so as to adjust the flow rate of brake fluid flowing from the hydraulic master cylinder (11) to the solenoid valve (40).

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