Automatic testing equipment and control method for internal leakage of electric water valve of new energy vehicle

Abstract

The present invention discloses an automatic test device for internal leakage of an electric water valve of a new energy vehicle and a control method thereof, comprising: a pipeline control component, having a number of input pipelines and output pipelines adapted to the electric water valve to be tested, each input pipeline is provided with an input control solenoid valve, the input control solenoid valve comprises a normally open valve port and a normally closed valve port, and each output pipeline is provided with an output control solenoid valve; a controller, controlled by a preset test program to control the opening and closing of each normally open valve port, the normally closed valve port, and the output control of the test pipeline solenoid valve in each test mode and the opening degree of the electric water valve to be tested in each working mode; a front flow meter, connected to the input end of the input control solenoid valve through the input pipeline; in a state where each channel of the electric water valve is independently tested for internal leakage, the internal leakage of the electric water valve is tested based on the change of the accumulated flow detected by the front flow meter.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric water valve testing, and in particular relates to an automatic testing device for internal leakage of an electric water valve of a new energy vehicle and a control method thereof. Background Art

[0002] The electric water valve in the thermal management application of new energy vehicles must meet the relevant performance index requirements before leaving the factory. The electric water valve is an important part of the thermal management system of new energy vehicles, and its performance has a vital impact on the operational reliability and safety of the thermal management system of the vehicle. Therefore, in the production process of automotive electric water valves, strict testing and inspection is an indispensable link.

[0003] The test equipment used for the internal leakage test (the test medium is antifreeze) in the performance test of the electric water valve currently relies more on manual operation and has a relatively low output efficiency. Figure 1 It is mainly composed of four parts: booster, liquid storage tank, water inlet pipe, plugging tooling. Its specific working principle and test operation steps are as follows:

[0004] 1. Install the valve on the fixture; 2. Connect the control line to the computer; 3. Input the target angle, and turn the valve to the target angle through the upper computer control valve; 4. Connect the water inlet to the water pipe and seal the water outlet (usually with a clamp); 5. Use a manual pressure regulating valve to pressurize the liquid storage tank; 6. Open the pipeline switch and manually time; 7. Put the liquid collection box on the weighing table and return it to 0; 8. Use the liquid collection box to collect all open water outlets; 9. After collecting for 1 minute, turn off the pipeline switch, put the collected liquid back on the weighing table to weigh, read and manually record the value. Repeating the above steps once can complete a test mode. If there is a centralized test mode, you need to repeat the above steps several times.

[0005] The above test equipment and test schemes have many test steps, low test efficiency (it is necessary to operate the computer, pressure regulating valve, electronic scale at the same time, and frequently switch the test pipeline), the leakage liquid cannot be collected manually (low test accuracy), and frequent switching of pipelines causes a lot of antifreeze residue in the pipeline and is easy to remain on the equipment workbench, which is not conducive to on-site 5S management. When it is necessary to conduct internal leakage tests on electric water valves in batches, the above disadvantages have a very serious impact: testers are easily tired and distracted, resulting in mistakes, the test efficiency is extremely low and it is difficult to meet the delivery requirements, and resources are greatly wasted. In order to improve the efficiency and accuracy of the test, a device that can automatically perform internal leakage tests on water valves is needed. Summary of the invention

[0006] To solve the above problems, the purpose of the present invention is to provide an automatic testing device for internal leakage of an electric water valve of a new energy vehicle and a control method thereof, which can solve the problems of low testing efficiency, waste of human resources, easy testing errors and low testing accuracy existing in the prior art.

[0007] To achieve the above purpose, the technical solution of the present invention is: an automatic test device for internal leakage of electric water valve of new energy vehicle, comprising:

[0008] A pipeline control component, having a number of input pipelines and output pipelines adapted to the electric water valve to be tested, each input pipeline is provided with an input control solenoid valve, the input control solenoid valve includes a normally open valve port and a normally closed valve port, and each output pipeline is provided with an output control solenoid valve;

[0009] A controller, controlled by a preset test program, controls the opening of each of the normally open valve ports, the normally closed valve ports, the output control solenoid valves and the electric water valve to be tested in the pipeline control assembly;

[0010] A front flow meter is connected to the input end of the input control solenoid valve through the input pipeline;

[0011] In a state where each channel of the electric water valve is independently tested for internal leakage, the internal leakage of the electric water valve is tested based on the change of the accumulated flow detected by the front flow meter.

[0012] Preferably, the automatic testing equipment also includes a host computer in which a test program is provided. The host computer is connected to the controller signal to control the opening of each normally open valve port, the normally closed valve port and the output control solenoid valve in the pipeline control component through the controller based on the test program to realize automatic testing of the electric water valve.

[0013] Preferably, the automatic testing equipment further comprises a liquid storage tank and a liquid return tank, the liquid storage tank is connected to the input end of the front flow meter, and the liquid return tank is respectively connected to each of the normally closed valve ports and the output control solenoid valve.

[0014] Preferably, the automatic testing equipment also includes an air filter, a pre-pressurization valve, a test switch valve, and a main liquid filling valve. The pre-pressurization valve and the test switch valve are both three-way valves. One end of the air filter is connected to compressed air, and the other end is connected to the input ends of the pre-pressurization valve and the test switch valve through a pressure gauge. The first outlets of the pre-pressurization valve and the test switch valve are both connected to the liquid storage tank, and the main liquid filling valve is arranged on the pipeline between the pre-flow meter and the input control solenoid valve.

[0015] Preferably, the automatic testing equipment also includes a pressure control system, which includes a first pressure relief valve, a second pressure relief valve and a pressure gauge, the first end of the first pressure relief valve is respectively connected to the output end of the air filter, the second end of the first pressure relief valve is respectively connected to the test switch valve and the second outlet of the pre-filling valve, and the second pressure relief valve is arranged on the pipeline connecting the input control solenoid valve and the liquid return tank.

[0016] Preferably, the second outlets of the pre-charge valve and the test switch valve are both connected to the input control solenoid valve via a pipeline cleaning valve.

[0017] Preferably, a filtering device is provided in the liquid return tank, and the medium leaked from the input control solenoid valve and the output control solenoid valve flows into the liquid return tank after passing through the filtering device. The liquid return tank is connected to the liquid storage tank, and a liquid replenishment switch valve and a diaphragm pump valve are provided on the pipeline between the liquid return tank and the liquid storage tank.

[0018] Preferably, the automatic testing equipment also includes a valve assembly testing jig, which is fixed on a work platform, the electric water valve is arranged in the valve assembly testing jig, the pipeline control assembly is configured inside the valve assembly testing jig, and the pipeline control assembly is connected to the input port or output port of the electric water valve to be tested through a plurality of quick-plug connectors.

[0019] Based on the same concept, the present invention also provides a control method for an automatic test device for internal leakage of an electric water valve of a new energy vehicle, which is applied to any of the test devices described above, and comprises the following steps:

[0020] Open the normally closed valve port of the test cavity, close the normally open valve port of the test cavity, fill the test cavity with medium, and close the output control solenoid valve of the test cavity when the air is discharged;

[0021] When the pressure in the test cavity reaches a preset threshold, the pressure of the current medium is maintained and no further pressure is applied to fill the test cavity with the medium;

[0022] Control the normally open valves of the remaining cavities outside the current test cavity to remain open, the normally closed valves to remain closed, and the output control solenoid valve to open;

[0023] Based on the cumulative flow change detected by the front flow meter, it is determined whether there is leakage at the current opening of the current test cavity;

[0024] Clean the residual liquid in the pipeline through the pipeline cleaning valve;

[0025] Change the valve opening of the current test cavity or switch to the next test cavity and repeat the above steps to perform the test.

[0026] Preferably, a pre-run is performed before performing the cavity test:

[0027] Fill the inner cavity of the electric water valve with medium, and control the electric water valve to automatically run 5 cycles through the controller to ensure that the inside of the electric water valve is fully lubricated. After the product feedback angle is normal, it will automatically jump to the test cycle.

[0028] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0029] The technical solution of the present invention includes a pipeline control component, a controller and a front flow meter. The pipeline control component is controlled by a preset program, so that the electric water valve can fill a test cavity with a medium and maintain pressure, and other cavities are closed and not filled with medium. Then, by monitoring the change of the cumulative flow of the front flow meter, it can be known whether the test cavity is leaking. If the reading of the front flow meter increases, it means that a leak has occurred in the test cavity, and a medium with a certain pressure will flow in. Therefore, compared with the existing method in the background technology, the technical solution of this embodiment is more convenient, efficient and accurate in testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0031] Figure 1 It is the principle diagram of the electric water valve leakage test bench in the prior art;

[0032] Figure 2 This is a schematic diagram of the composition of the automatic testing equipment for internal leakage of electric water valves of new energy vehicles of the present invention;

[0033] Figure 3 It is a schematic diagram of the working state of the automatic test of internal leakage of the electric water valve of a new energy vehicle according to the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] Example

[0037] See also Figure 1 This embodiment provides an automatic test device for internal leakage of electric water valve of new energy vehicle, including:

[0038] A pipeline control component, having a number of input pipelines and output pipelines adapted to the electric water valve to be tested, each input pipeline is provided with an input control solenoid valve, the input control solenoid valve includes a normally open valve port and a normally closed valve port, and each output pipeline is provided with an output control solenoid valve;

[0039] A controller, controlled by a preset test program, controls the opening of each of the normally open valve ports, the normally closed valve ports, the output control solenoid valves and the electric water valve to be tested in the pipeline control assembly;

[0040] A front flow meter is connected to the input end of the input control solenoid valve through the input pipeline;

[0041] In a state where each channel of the electric water valve is independently tested for internal leakage, the internal leakage of the electric water valve is tested based on the change of the accumulated flow detected by the front flow meter.

[0042] The technical solution of this embodiment includes a pipeline control component, a controller and a front flow meter. The pipeline control component is controlled by a preset program, so that the electric water valve can fill a test cavity with medium and maintain pressure, and other cavities are closed and not filled with medium. Then, by monitoring the change of the cumulative flow of the front flow meter, it can be known whether the test cavity is leaking. If the reading of the front flow meter increases, it means that there is a leak in the test cavity, and the medium with a certain pressure will flow in. Therefore, compared with the existing methods in the background technology, the technical solution of this embodiment is more convenient, efficient and accurate.

[0043] Preferably, the automatic testing equipment also includes a host computer in which a test program is provided. The host computer is connected to the controller signal to control the opening of each normally open valve port, the normally closed valve port and the output control solenoid valve in the pipeline control component through the controller based on the test program to realize automatic testing of the electric water valve.

[0044] The technical solution of this embodiment sends the test program to the controller through the host computer (such as a computer). Since the host computer is configured, it is convenient to modify the test program, the operation is convenient, the compatibility of the equipment can be improved, and it is suitable for testing electric water valves of different models and types.

[0045] Preferably, the automatic testing equipment further comprises a liquid storage tank and a liquid return tank, the liquid storage tank is connected to the input end of the front flow meter, and the liquid return tank is respectively connected to each of the normally closed valve ports and the output control solenoid valve.

[0046] The technical solution of this embodiment is convenient for storing and collecting the medium by configuring a liquid storage tank and a liquid return tank. Preferably, a liquid replenishment switch valve is also used to transfer the medium in the liquid return tank to the liquid storage tank, so that the medium can be reused conveniently.

[0047] Preferably, the automatic testing equipment also includes an air filter, a pre-pressurization valve, a test switch valve, and a main liquid filling valve. The pre-pressurization valve and the test switch valve are both three-way valves. One end of the air filter is connected to compressed air, and the other end is connected to the input ends of the pre-pressurization valve and the test switch valve through a pressure gauge. The first outlets of the pre-pressurization valve and the test switch valve are both connected to the liquid storage tank, and the main liquid filling valve is arranged on the pipeline between the pre-flow meter and the input control solenoid valve.

[0048] See also Figure 2 Through the pre-pressurization valve, test switch valve and liquid filling main valve, the flow direction of the pipeline control component can be conveniently controlled, so that it can be efficiently and quickly realized whether there is a leak in the cavity of the electric water valve.

[0049] Preferably, the automatic testing equipment also includes a pressure control system, which includes a first pressure relief valve, a second pressure relief valve and a pressure gauge, the first end of the first pressure relief valve is respectively connected to the output end of the air filter, the second end of the first pressure relief valve is respectively connected to the test switch valve and the second outlet of the pre-filling valve, and the second pressure relief valve is arranged on the pipeline connecting the input control solenoid valve and the liquid return tank.

[0050] In the technical solution of this embodiment, pressure relief valves are respectively configured in the two groups of circulation pipelines, which can improve the safety of the equipment and prevent safety accidents from occurring under special circumstances.

[0051] Preferably, the second outlets of the pre-charge valve and the test switch valve are both connected to the input control solenoid valve via a pipeline cleaning valve.

[0052] In order to enable rapid cleaning after each test cavity is tested so that the inner cavity and pipeline of the electric water valve meet the test adjustment, the technical solution of this embodiment is equipped with a pipeline cleaning valve to clean the pipeline and the inner cavity of the electric water valve, thereby further improving the test efficiency.

[0053] Preferably, a filtering device is provided in the liquid return tank, and the medium leaked from the input control solenoid valve and the output control solenoid valve flows into the liquid return tank after passing through the filtering device. The liquid return tank is connected to the liquid storage tank, and a liquid replenishment switch valve and a diaphragm pump valve are provided on the pipeline between the liquid return tank and the liquid storage tank.

[0054] The technical solution of this embodiment is to set a filter device in the liquid return tank to maintain the cleanliness of the medium, thereby facilitating the long-term stable operation of the equipment, increasing the service life, and not affecting the performance of the electric water valve. The medium of the present invention can be antifreeze.

[0055] Preferably, the automatic testing equipment also includes a valve assembly testing jig, which is fixed on a work platform, the electric water valve is arranged in the valve assembly testing jig, the pipeline control assembly is configured inside the valve assembly testing jig, and the pipeline control assembly is connected to the input port or output port of the electric water valve to be tested through a plurality of quick-plug connectors.

[0056] The technical solution of this embodiment can conveniently and quickly realize the connection between the electric water valve and the test equipment through the quick-plug connector and the valve assembly test fixture, thereby improving the test efficiency.

[0057] Based on the same concept, the present invention also provides a control method for an automatic test device for internal leakage of an electric water valve of a new energy vehicle, which is applied to any of the test devices described above, and comprises the following steps:

[0058] Open the normally closed valve port of the test cavity, close the normally open valve port of the test cavity, fill the test cavity with medium, and close the output control solenoid valve of the test cavity when the air is discharged;

[0059] When the pressure in the test cavity reaches a preset threshold, the pressure of the current medium is maintained and no further pressure is applied to fill the test cavity with the medium;

[0060] Control the normally open valves of the remaining cavities outside the current test cavity to remain open, the normally closed valves to remain closed, and the output control solenoid valve to open;

[0061] Based on the change of the accumulated flow rate detected by the front flow meter, it is judged whether there is leakage at the current opening of the current test cavity;

[0062] Clean the residual liquid in the pipeline through the pipeline cleaning valve;

[0063] Change the valve opening of the current test cavity or switch to the next test cavity and repeat the above steps to perform the test.

[0064] The technical solution of this embodiment includes a pipeline control component, a controller and a front flow meter. The pipeline control component is controlled by a preset program, so that the electric water valve can fill a test cavity with a medium and maintain pressure, and the other cavities are closed and not filled with medium. Then, by monitoring the change of the cumulative flow of the front flow meter, it can be known whether the test cavity is leaking. If the reading of the front flow meter increases, it means that a leak has occurred in the test cavity, and the medium with a certain pressure will flow in. Therefore, compared with the existing methods in the background technology, the technical solution of this embodiment is more convenient, efficient and accurate. The operator only needs to press the start button once, and the equipment can automatically complete all mode tests according to the pre-set test program. The electric water valve internal leakage test system is quickly built, which reduces manual operation and improves test efficiency. The method of collecting cumulative flow through the front flow meter ensures the accuracy of the test data; the automatic timer of the equipment ensures that the test time is consistent and accurate. The automated test process significantly reduces the manual operation of technicians, and the test data can generate a test report by itself through the data acquisition system and automatically judge OK and NG without unit conversion. It reduces labor intensity and reduces the possibility of operating errors. In addition, after each test mode is completed, the equipment can automatically clean the test pipeline to prevent antifreeze from spilling onto the workbench during loading and unloading, facilitating on-site 5S management.

[0065] See also Figure 3 A schematic diagram of an embodiment of a testing process of a testing device is shown.

[0066] Preferably, a pre-run is performed before performing the cavity test:

[0067] Fill the inner cavity of the electric water valve with medium, and control the electric water valve to automatically run 5 cycles (from the upper limit to the lower limit) through the controller to ensure that the electric water valve is fully lubricated. After the product feedback angle is normal, it will automatically jump to the test cycle. Until all test modes are completed one by one, the test product pipeline is depressurized, and the valve runs to the factory setting angle, then the product is manually taken out.

[0068] For example, in the pre-run phase:

[0069] Station circuit: valve A1Valve open, A1 leak closed, valve B3Valve closed, valves A2 / A3 / A4 / A5 / A6 / A7 / A8 closed, valve A2 leak / A3 leak / A4 leak / A5 leak / A6 leak / A7 leak / A8 leak open, valves B1 / B2 / B4 / B5 / B6 / B7 / B8 open, the medium automatically enters the product to be tested.

[0070] (The gas tank can be pre-charged with low pressure)

[0071] Testing phase:

[0072] Station circuit: Valve A1Valve open, A1 leak closed, valve B4Valve closed, valves A2 / A3 / A4 / A5 / A6 / A7 / A8 closed, valve A2 leak / A3 leak / A4 leak / A5 leak / A6 leak / A7 leak / A8 leak open, valves B1 / B2 / B3 / B5 / B6 / B7 / B8 open, and perform a pressurization test. (Fill the liquid tank to test the pressure, and the flow meter will measure after the fluid stabilizes)

[0073] Station circuit: Valve A6Valve open, A6 leak closed, valve B7Valve closed, valves A1 / A2 / A3 / A4 / A5 / A8 closed, valves A1 leak / A2 leak / A3 leak / A4 leak / A5 leak / / A7 leak / A8 leak open, valves B1 / B2 / B3 / B4 / B5 / B6 / B8 open, and perform a pressurization test. (Fill the liquid tank to test the pressure, and the flow meter will measure after the fluid stabilizes)

[0074] The test is over;

[0075] Workstation circuit: the main filling valve is closed, the residual liquid cleaning valve is opened, valve A1Valve is opened, the A1 leak is closed, valves A2 / A3 / A4 / A5 / A6 / A7 / A8 are closed, valves A2 leak / A3 leak / A4 leak / A5 leak / A6 leak / A7 leak / A8 leak are opened, and valves B1 / B2 / B3 / B4 / B5 / B6 / B7 / B8 are opened.

[0076] Workstation circuit: valve A6Valve open, A6 leak closed, valves A1 / A2 / A3 / A4 / A5 / A7 / A8 closed, valves A1 leak / A2 leak / A3 leak / A4 leak / A5 leak / / A7 leak / A8 leak open, valves B1 / B2 / B3 / B4 / B5 / B6 / B8 open.

[0077] According to product design requirements, the valve is turned to the factory angle.

[0078] Liquid replenishment: The liquid replenishment switch valve and the pressure relief valve are open (when the liquid level in the liquid tank is lower than the lower limit or the liquid level in the recovery tank is higher than the upper limit, the equipment automatically draws the liquid from the recovery tank back to the liquid tank).

[0079] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. An automatic test device for internal leakage of electric water valve of new energy vehicle, characterized in that: include: A pipeline control component, having a number of input pipelines and output pipelines adapted to the electric water valve to be tested, each input pipeline is provided with an input control solenoid valve, the input control solenoid valve includes a normally open valve port and a normally closed valve port, and each output pipeline is provided with an output control solenoid valve; A controller, controlled by a preset test program, controls the opening of each of the normally open valve ports, the normally closed valve ports, the output control solenoid valves and the electric water valve to be tested in the pipeline control assembly; A front flow meter is connected to the input end of the input control solenoid valve through the input pipeline; In a state where each channel of the electric water valve is independently tested for internal leakage, the internal leakage of the electric water valve is tested based on the change of the accumulated flow detected by the front flow meter.

2. The automatic testing equipment for internal leakage of electric water valve of new energy vehicle according to claim 1 is characterized in that: The automatic testing equipment also includes a host computer, which is provided with a test program. The host computer is connected to the controller signal to control the opening of each normally open valve port, the normally closed valve port and the output control solenoid valve in the pipeline control component through the controller based on the test program to realize automatic testing of the electric water valve.

3. The automatic testing equipment for internal leakage of electric water valve of new energy vehicle according to claim 1 is characterized in that: The automatic testing equipment further comprises a liquid storage tank and a liquid return tank, wherein the liquid storage tank is communicated with the input end of the front flow meter, and the liquid return tank is respectively communicated with each of the normally closed valve ports and the output control solenoid valve.

4. The automatic internal leakage testing equipment for electric water valves of new energy vehicles according to claim 3 is characterized in that: The automatic testing equipment also includes an air filter, a pre-pressurization valve, a test switch valve, and a main liquid filling valve. The pre-pressurization valve and the test switch valve are both three-way valves. One end of the air filter is connected to compressed air, and the other end is connected to the input ends of the pre-pressurization valve and the test switch valve through a pressure gauge. The first outlets of the pre-pressurization valve and the test switch valve are both connected to the liquid storage tank, and the main liquid filling valve is arranged on the pipeline between the front flow meter and the input control solenoid valve.

5. The automatic internal leakage testing equipment for electric water valves of new energy vehicles according to claim 4 is characterized in that: The automatic testing equipment also includes a pressure control system, which includes a first pressure relief valve, a second pressure relief valve and a pressure gauge, wherein the first end of the first pressure relief valve is respectively connected to the output end of the air filter, the second end of the first pressure relief valve is respectively connected to the second outlet of the test switch valve and the pre-charge valve, and the second pressure relief valve is arranged on the pipeline connecting the input control solenoid valve and the liquid return tank.

6. The automatic internal leakage testing equipment for electric water valves of new energy vehicles according to claim 4 is characterized in that: The second outlets of the pre-charge valve and the test switch valve are both connected to the input control solenoid valve through a pipeline cleaning valve.

7. The automatic internal leakage test equipment for electric water valve of new energy vehicle according to claim 3 is characterized in that: A filtering device is provided in the liquid return tank, and the medium leaked from the input control solenoid valve and the output control solenoid valve flows into the liquid return tank after passing through the filtering device. The liquid return tank is connected to the liquid storage tank, and a liquid replenishment switch valve and a diaphragm pump valve are provided on the pipeline between the liquid return tank and the liquid storage tank.

8. The automatic testing equipment for internal leakage of electric water valve of new energy vehicle according to claim 1 is characterized in that: The automatic testing equipment also includes a valve assembly testing tool, which is fixed on a work platform. The electric water valve is arranged in the valve assembly testing tool, and the pipeline control component is configured inside the valve assembly testing tool. The pipeline control component is connected to the input port or output port of the electric water valve to be tested through multiple quick-connect connectors.

9. A control method for an automatic test device for internal leakage of an electric water valve of a new energy vehicle, applied to the test device according to any one of claims 1 to 8, characterized in that: The steps include: Open the normally closed valve port of the test cavity, close the normally open valve port of the test cavity, fill the test cavity with medium, and close the output control solenoid valve of the test cavity when the air is discharged; When the pressure in the test cavity reaches a preset threshold, the pressure of the current medium is maintained and no further pressure is applied to fill the test cavity with the medium; Control the normally open valves of the remaining cavities outside the current test cavity to remain open, the normally closed valves to remain closed, and the output control solenoid valve to open; Based on the change of the accumulated flow rate detected by the front flow meter, it is judged whether there is leakage at the current opening of the current test cavity; Clean the residual liquid in the pipeline through the pipeline cleaning valve; Change the valve opening of the current test cavity or switch to the next test cavity and repeat the above steps to perform the test.

10. A control method for automatic testing equipment for internal leakage of electric water valves of new energy vehicles, characterized in that: Before performing the cavity test, a pre-run is also performed: Fill the inner cavity of the electric water valve with medium, and control the electric water valve to automatically run 5 cycles through the controller to ensure that the inside of the electric water valve is fully lubricated. After the product feedback angle is normal, it will automatically jump to the test cycle.

Images