An electronic water pump testing system and method

Abstract

The application provides an electronic water pump test system and method, the electronic water pump test system includes performance test loop and medium temperature control loop, in the performance test loop, the opening of flow regulating valve is controlled using PID control method, so as to adjust the differential pressure of water pump, thereby improving the adjustment accuracy; in the medium temperature control loop, two medium tanks are set, after the medium is heated or cooled by the cold and hot integrated machine, first flows back into the second medium tank, after sufficient mixing, flows back into the first medium tank through the low-position through pipeline, and then enters the liquid inlet of the electronic water pump, so as to ensure the stability of the medium temperature at the inlet of the water pump, at the same time, the air source pressurizing device is added at the top of the medium tank, to simulate the actual working condition of the electronic water pump, so as to more truly reflect the working state of the electronic water pump in actual use, and improve the accuracy of the test. In this way, the full-automatic test of the water pump performance is realized, the labor cost is effectively reduced, and the test efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of water pump testing technology, and more specifically, to an electronic water pump testing system and method. Background Technology

[0002] An electronic water pump is a new type of water pump that uses an electronically controlled drive unit. It utilizes piezoelectric materials or other electronic devices as a power source and fully controls the transfer of liquid through an integrated electronic system. Electronic water pumps can precisely control water flow and pressure to meet the needs of different operating conditions. Testing the performance of electronic water pumps is a crucial step in ensuring their quality and reliability.

[0003] Currently, the performance testing of electronic water pumps mainly employs a manual method. This involves manually adjusting the pump to the appropriate speed and then manually adjusting the opening size of the ball valve to regulate the pump pressure differential. However, electronic water pump performance testing requires combining different speeds and pressure differentials. This method is labor-intensive and, due to its low adjustment precision and pressure differential oscillations during adjustment, results in low testing efficiency. Summary of the Invention

[0004] The purpose of this application is to provide an electronic water pump testing system and method, which aims to solve the problems of high manpower costs and low testing efficiency in the performance testing schemes of electronic water pumps in related technologies.

[0005] In a first aspect, this application provides an electronic water pump testing system, comprising a performance testing circuit formed by sequentially connecting a first medium tank, an electronic water pump under test, and a second medium tank; and a medium temperature control circuit formed by sequentially connecting the first medium tank, a temperature-controlled water pump, a combined cooling and heating unit, and the second medium tank; wherein: a flow path is provided between the electronic water pump under test and the second medium tank in the performance testing circuit, and the flow path is equipped with a solenoid valve, a flow meter, and a flow regulating valve; a first pressure gauge and a second pressure gauge are respectively provided upstream and downstream of the electronic water pump under test in the performance testing circuit to detect the inlet and outlet pressures of the electronic water pump under test; a low-pressure... The system includes a through-pipe; the top of the first medium tank and the top of the second medium tank are both connected to an air source pressurization device; the air source pressurization device is used to control the air pressure in the first medium tank and the second medium tank to simulate the actual working conditions of the electronic water pump under test; the temperature-controlled water pump is used to transfer the medium in the first medium tank to the integrated heating and cooling unit for heating or cooling; the electronic water pump testing system also includes a control unit, which is used to collect the test data of the electronic water pump under test, and also to control the speed of the electronic water pump under test during the performance test of the electronic water pump under test, and to control the opening of the flow regulating valve by using a PID control method to adjust the inlet and outlet pressure difference of the electronic water pump under test.

[0006] In the above implementation process, an electronic water pump testing system is provided, including a performance testing loop and a medium temperature control loop. In the performance testing loop, a PID control method is used to control the opening of the flow regulating valve, thereby adjusting the water pump pressure difference and improving the adjustment accuracy. In the medium temperature control loop, two medium tanks are set up. After the medium is heated or cooled by an integrated heating and cooling unit, it first flows back to the second medium tank. After being fully mixed, it flows back to the first medium tank through a low-level through-pipe and then enters the inlet of the electronic water pump, thus ensuring a stable inlet medium temperature. At the same time, an air source pressurization device is added to the top of the medium tank to simulate the actual working conditions of the electronic water pump, thereby more realistically reflecting the working state of the electronic water pump in actual use and improving the accuracy of the test. In this way, fully automatic testing of water pump performance is achieved, effectively reducing labor costs and improving testing efficiency.

[0007] Furthermore, in some examples, the flow path includes a first flow path and a second flow path arranged in parallel; the solenoid valve, flow meter, and flow regulating valve respectively include a first solenoid valve, a first flow meter, and a first flow regulating valve arranged in the first flow path, and a second solenoid valve, a second flow meter, and a second flow regulating valve arranged in the second flow path; the pipe diameter of the first flow path is smaller than the pipe diameter of the second flow path.

[0008] In the above implementation process, a dual-path design can be adopted between the electronic water pump under test and the second medium tank. The two flow paths use different pipe diameters, which can adapt to the testing of electronic water pumps with different flow ranges.

[0009] Furthermore, in some examples, the control unit is also used to: control the first solenoid valve to open and control the second solenoid valve to close when the flow rate of the electronic water pump under test is determined to correspond to the pipe diameter of the first flow passage according to the calibration table; control the first solenoid valve to close and control the second solenoid valve to open when the flow rate of the electronic water pump under test is determined to correspond to the pipe diameter of the second flow passage according to the calibration table; wherein the calibration table records the available flow range corresponding to different pipe diameters.

[0010] In the above implementation process, during the performance test of the electronic water pump, the control unit changes the corresponding flow path according to the flow rate of the electronic water pump under test, thereby effectively improving the test accuracy.

[0011] Furthermore, in some examples, the gas source pressurization device includes a gas source and a pressure proportional valve; the pressure proportional valve is used to control the gas pressure output by the gas source.

[0012] In the above implementation process, the system control program can output a corresponding voltage to the air pressure proportional valve according to the different medium temperatures, so as to control the opening degree of the air pressure proportional valve and output the corresponding air pressure to the medium tank, so that the test process can more realistically reflect the working status of the electronic water pump in actual use.

[0013] Furthermore, in some examples, the performance test circuit is also equipped with a filter between the first media tank and the electronic water pump under test; the filter is used to filter impurities in the media.

[0014] In the above implementation process, a filter can be installed at the inlet of the electronic water pump under test to filter impurities in the medium, thereby reducing variables in the testing process, improving the accuracy of the test results, and reducing wear caused by impurities such as solid particles on key components such as the impeller and bearings of the electronic water pump under test, thus extending the life of the electronic water pump under test.

[0015] Furthermore, in some examples, the performance test circuit also includes: a first thermometer and a second thermometer respectively installed upstream and downstream of the electronic water pump under test, to detect the inlet and outlet temperatures of the electronic water pump under test.

[0016] In the above implementation process, a thermometer can be set up upstream and downstream of the electronic water pump under test. In this way, the control unit can combine the difference between the inlet and outlet temperatures to verify the validity of the test and more accurately evaluate the performance indicators of the electronic water pump under test.

[0017] Furthermore, in some examples, a third thermometer and a level gauge are provided inside the first medium tank.

[0018] In the above implementation process, a thermometer and a level gauge are installed in the first medium tank to monitor the temperature and level of the medium in the first medium tank, thereby ensuring the proper operation of the electronic water pump testing system.

[0019] Secondly, this application provides an electronic water pump testing method, applied to a control unit in an electronic water pump testing system as described in any of the first aspects; the method includes: after controlling the integrated heating and cooling unit to heat or cool the medium to a target test temperature, controlling the air source pressurization device to adjust the air pressure in the first medium tank and the second medium tank to the target medium tank air pressure; controlling the rotation speed of the electronic water pump under test according to a pre-set water pump tachometer, then controlling the inlet and outlet pressure difference of the electronic water pump under test according to a pre-set water pump differential pressure gauge, and using a PID control method to control the opening of the flow regulating valve to adjust the inlet and outlet pressure difference of the electronic water pump under test to the corresponding pressure difference set value; after the inlet and outlet pressure difference of the electronic water pump under test stabilizes, collecting the test parameters of the electronic water pump under test, and saving the collected test parameters in a database.

[0020] In the above implementation process, an electronic water pump testing method is provided to quickly and accurately perform performance testing of the electronic water pump under test conditions composed of different speed points and different pressure differential points.

[0021] Furthermore, in some embodiments, the system further includes: outputting alarm information when the electronic water pump testing system meets abnormal state conditions; the abnormal state conditions include any one of the following: the air pressure adjustment time in the first medium tank or the second medium tank exceeds a first preset time, and the air pressure does not reach the target medium tank air pressure; the temperature adjustment time of the medium exceeds a second preset time, and the temperature of the medium does not reach the target test temperature; the inlet and outlet pressure difference adjustment time of the electronic water pump under test exceeds a third preset time, and the inlet and outlet pressure difference does not reach the corresponding pressure difference set value; the difference between the temperature of the medium in the first medium tank and the inlet and outlet temperatures of the electronic water pump under test is not within a preset temperature difference range; when the flow regulating valve is completely closed, the inlet and outlet pressure difference of the electronic water pump under test does not reach the corresponding pressure difference set value.

[0022] In the above implementation process, an automatic alarm mechanism is introduced to deal with abnormal states, which enhances the security and reliability of the testing system, while also improving data accuracy.

[0023] Furthermore, in some embodiments, the method further includes: selecting corresponding test data from the database according to pre-set query conditions, plotting a target performance curve based on the selected test data, and outputting and displaying the curve.

[0024] In the above implementation process, a data query function is provided. Based on the set query conditions, the corresponding data is filtered and the target performance curves are plotted, such as head-flow curves and net positive suction head-flow curves, to facilitate the query by testers.

[0025] Thirdly, this application provides an electronic device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the method described in any of the first aspects.

[0026] Fourthly, this application provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the method described in any of the first aspects.

[0027] Fifthly, this application provides a computer program product that, when run on a computer, causes the computer to perform the method described in any of the first aspects.

[0028] Other features and advantages disclosed in this application will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described technology disclosed in this application.

[0029] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of an electronic water pump testing system provided in an embodiment of this application;

[0032] Figure 2 A flowchart of an electronic water pump testing method provided in this application embodiment;

[0033] Figure 3A schematic diagram of the structure of an electronic water pump performance testing device provided in this application embodiment;

[0034] Figure 4 A schematic diagram illustrating the workflow of an electronic water pump testing system provided in this application embodiment to achieve fully automated testing of electronic water pump performance;

[0035] Figure 5 A block diagram of an electronic water pump testing device provided in an embodiment of this application;

[0036] Figure 6 This is a structural block diagram of an electronic device provided in an embodiment of this application.

[0037] Wherein: 11-First medium tank; 12-Electronic water pump under test; 13-Second medium tank; 14-Temperature-controlled water pump; 15-Combined heating and cooling unit; 16-Solenoid valve; 161-First solenoid valve; 162-Second solenoid valve; 17-Flow meter; 171-First flow meter; 172-Second flow meter; 18-Flow regulating valve; 181-First flow regulating valve; 182-Second flow regulating valve; 19-First pressure gauge; 20-Second pressure gauge; 21-Air source pressurization device; 211-Air source; 212-Air pressure proportional valve; 213-Pressure relief device; 22-Control unit; 23-First thermometer; 24-Second thermometer; 25-First ball valve; 26-Second ball valve; 27-Third ball valve; 28-Filter; 29-Third thermometer; 30-Level gauge. Detailed Implementation

[0038] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0039] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] As described in the background section, existing performance testing methods for electronic water pumps suffer from high labor costs and low testing efficiency. Therefore, this application provides a novel electronic water pump testing method to address these issues.

[0041] The embodiments of this application will be described below:

[0042] like Figure 1 As shown, Figure 1This is a schematic diagram of an electronic water pump testing system provided in an embodiment of this application. The automotive thermal management system includes a performance test circuit formed by sequentially connecting a first medium tank 11, an electronic water pump under test 12, and a second medium tank 13; and a medium temperature control circuit formed by sequentially connecting the first medium tank 11, a temperature-controlled water pump 14, a combined cooling and heating unit 15, and the second medium tank 13. Specifically: a flow path is provided between the electronic water pump under test 12 and the second medium tank 13 in the performance test circuit, and the flow path is equipped with a solenoid valve 16, a flow meter 17, and a flow regulating valve 18; a first pressure gauge 19 and a second pressure gauge 20 are respectively provided upstream and downstream of the electronic water pump under test 12 in the performance test circuit to detect the inlet and outlet pressures of the electronic water pump under test 12; a low-level through pipe is provided between the first medium tank 11 and the second medium tank 13. The top of the first medium tank 11 and the top of the second medium tank 13 are both connected to the air source pressurization device 21; the air source pressurization device 21 is used to control the air pressure in the first medium tank 11 and the second medium tank 13 to simulate the actual working conditions of the electronic water pump 12 under test; the temperature-controlled water pump 14 is used to transfer the medium in the first medium tank 11 to the integrated heating and cooling unit 15 for heating or cooling; the electronic water pump testing system also includes a control unit 22, which is used to collect the test data of the electronic water pump 12 under test, and also to control the speed of the electronic water pump 12 under test during the performance test of the electronic water pump 12 under test, and to control the opening of the flow regulating valve 18 by using the PID control method to adjust the inlet and outlet pressure difference of the electronic water pump 12 under test.

[0043] In the electronic water pump testing system provided in this embodiment, two media tanks are set up to ensure the stability of the water pump inlet medium temperature. After the medium is heated or cooled by the integrated heating and cooling unit, it first flows back to the second media tank. After being fully mixed, it flows back to the first media tank through a low-level through-pipe and then enters the electronic water pump inlet. The medium here can be coolant, or different settings can be made according to the needs of different application scenarios. At the same time, an air source pressurization device is added to the top of the media tank to simulate the actual working conditions of the electronic water pump. This more realistically reflects the working state of the electronic water pump in actual use, thereby improving the accuracy and reliability of the test.

[0044] In some embodiments, the gas pressurization device includes a gas source and a proportional pressure valve; the proportional pressure valve is used to control the gas pressure output by the gas source to the first medium tank and the second medium tank. The gas source can be compressed air, nitrogen, or an inert gas, which can be selected according to the characteristics of the medium and the required pressure. The proportional pressure valve can be a device for regulating gas flow, and its input voltage is positively correlated with the gas pressure output by the gas source. In practical applications, as the coolant circulates, the temperature gradually increases, and the gas pressure in the medium tank increases. Therefore, in this embodiment, the system control program can output a voltage of 0~10V to the proportional pressure valve according to the different medium temperatures, thereby outputting a gas pressure of 0~900kPa to the medium tank.

[0045] This electronic water pump testing system uses a flow regulating valve to adjust the pump pressure difference and employs a PID (Proportional-Integral-Derivative) control method to control the valve opening, resulting in high adjustment accuracy and fast response. Therefore, this electronic water pump testing system can achieve fully automated testing of pump performance, effectively reducing labor costs and improving testing efficiency. Specifically, in the performance testing loop of this electronic water pump testing system, a flow path is set between the electronic water pump under test and the second medium tank. This flow path is equipped with a solenoid valve, a flow meter, and a flow regulating valve. The solenoid valve here can be a normally closed valve, remaining closed when not under test to prevent media leakage. The flow meter can be used to test the flow rate at the outlet of the electronic water pump under test. The flow regulating valve is a flow regulation and control device that controls the flow rate by adjusting the valve opening. In this embodiment, the flow regulating valve can be designed to accept electrical signal input and proportionally adjust the valve opening according to the magnitude of the input signal, thereby controlling the flow rate and changing the pressure difference between the inlet and outlet of the test water pump. In this case, the flow regulating valve can be considered a proportional valve. Additionally, pressure gauges are installed upstream and downstream of the electronic water pump under test to detect the inlet and outlet pressures of the pump, respectively.

[0046] The control unit of this electronic water pump testing system can be considered the core of the entire system. It is responsible for controlling, monitoring, and recording various test data during the testing process. This test data can include data from various sensors, such as the first and second pressure gauges, and flow meters; it can also include the pump's own parameter data, such as torque, speed, voltage, and current; and it can include pump performance indicators calculated based on these data, such as head, effective power, and net positive suction head (NPSH). In addition, this control unit can also control various electrically controlled valves in the testing system, such as solenoid valves, flow regulating valves, and proportional valves, as well as other electronic components, such as the integrated cooling and heating unit and the electronic water pump under test. In some scenarios, the control unit can be implemented as a control system including a data acquisition card and a computer. During the test, the control system can control the data acquisition card to output a PWM (Pulse Width Modulation) signal with a corresponding duty cycle to control the speed of the electronic water pump under test. It can also control the data acquisition card to output a voltage of 0 to 10V, corresponding to the opening degree of the flow regulating valve from 100% to 0%, thereby controlling the pressure difference between the inlet and outlet of the electronic water pump. The computer can be used to analyze and save the data acquired by the data acquisition card.

[0047] In this embodiment, the control unit uses a PID control method to adjust the inlet and outlet pressure difference of the electronic water pump under test. The PID control method consists of three parts: proportional, integral, and derivative. The proportional part adjusts the output of the PID controller based on the magnitude of the error; the larger the error, the larger the output, and this part can quickly reduce the error. The integral part adjusts the output of the PID controller based on the accumulation of error, which can eliminate the steady-state error of the system. The derivative part adjusts the output of the PID controller based on the rate of change of the error, which can predict the trend of error change in advance, thereby accelerating the system's response speed and suppressing excessive overshoot. In implementation, the first and second pressure gauges monitor the inlet and outlet pressures of the electronic water pump under test in real time and feed the inlet and outlet pressure data back to the control unit. The control unit obtains the current inlet and outlet pressure difference based on the feedback inlet and outlet pressure data, compares it with the preset reference pressure difference, calculates the error value, and then inputs the error value into the PID controller. The PID controller calculates the control quantity according to the PID algorithm and converts the control quantity into a voltage signal for the flow regulating valve, thereby controlling the opening of the flow regulating valve and adjusting the inlet and outlet pressure difference of the electronic water pump under test. This allows for precise control of the pressure difference between the inlet and outlet of the electronic water pump, thereby effectively improving the efficiency of electronic water pump performance testing.

[0048] The electronic water pump testing system of this application can also have the following further improvements:

[0049] In some embodiments, the flow path includes a first flow path and a second flow path arranged in parallel; the solenoid valve, flow meter, and flow regulating valve respectively include a first solenoid valve, a first flow meter, and a first flow regulating valve arranged in the first flow path, and a second solenoid valve, a second flow meter, and a second flow regulating valve arranged in the second flow path; the pipe diameter of the first flow path is smaller than the pipe diameter of the second flow path. That is, a dual-path design can be adopted between the electronic water pump under test and the second medium tank. The first flow path includes a first solenoid valve, a first flow meter, and a first flow regulating valve, while the second flow path includes a second solenoid valve, a second flow meter, and a second flow regulating valve. These two flow paths are implemented as pipelines with different diameters, thereby adapting to the testing of electronic water pumps with different flow ranges.

[0050] Furthermore, in some embodiments, the control unit is also used to: control the first solenoid valve to open and control the second solenoid valve to close when the flow rate of the electronic water pump under test is determined to correspond to the pipe diameter of the first flow path according to the calibration table; control the first solenoid valve to close and control the second solenoid valve to open when the flow rate of the electronic water pump under test is determined to correspond to the pipe diameter of the second flow path according to the calibration table; the calibration table records the available flow range corresponding to different pipe diameters. That is, by establishing a calibration table to record the available flow range corresponding to different pipe diameters, during the performance testing of the electronic water pump, the control program of the electronic water pump testing system can collect the flow rate of the electronic water pump under test from the flow meter, and then query the calibration table based on the flow rate to change the corresponding flow path. For example, a small-flow-rate water pump is tested using a small-diameter flow path, and a large-flow-rate water pump is tested using a large-diameter flow path, thus effectively improving the testing accuracy. The available flow range corresponding to different pipe diameters can be obtained based on the following method:

[0051] For diameter of The specific resistance of the pipeline is calculated based on the following formula. :

[0052]

[0053] Next, determine the effective head difference at both ends of the pipeline. :

[0054]

[0055] In the formula, The pressure difference between the two ends of the pipeline; The density of the medium; It is the acceleration due to gravity; This refers to the height difference between the beginning and end of the pipe.

[0056] Based on the above calculation results and the length of the pipeline from one end to the other... Calculate the recommended flow rate for this pipeline. :

[0057]

[0058] Based on the recommended flow rate for this pipeline This allows you to obtain the available flow range corresponding to that pipe diameter.

[0059] In some embodiments, a filter is further provided between the first media tank and the electronic water pump under test in the performance test circuit; the filter is used to filter impurities in the media. That is, a filter can be provided at the inlet of the electronic water pump under test to filter impurities in the media, thereby reducing variables in the testing process, improving the accuracy of the test results, and reducing wear caused by impurities such as solid particles on key components of the electronic water pump under test, such as the impeller and bearings, thus extending the life of the electronic water pump under test. The type of filter can be selected according to the characteristics of the media, the type of impurities to be filtered, and the pipeline structure, etc., and this application does not impose any restrictions on this.

[0060] In some embodiments, a first thermometer and a second thermometer are respectively installed upstream and downstream of the electronic water pump under test in the performance test circuit to detect the inlet and outlet temperatures of the electronic water pump under test. That is, a thermometer can be installed upstream and downstream of the electronic water pump under test, and these two thermometers monitor the inlet and outlet temperatures of the electronic water pump under test in real time and feed them back to the control unit. In this way, the control unit can verify the validity of the test by considering the difference between the inlet and outlet temperatures. For example, if the difference between the inlet and outlet temperatures is large, it indicates that the test results may be unreliable and a retest is required. This allows for a more accurate evaluation of the performance indicators of the electronic water pump.

[0061] In some embodiments, a third thermometer and a level gauge are installed in the first medium tank. That is, a thermometer is installed in the first medium tank to monitor the temperature of the medium inside. When the medium temperature reaches a set value, the test system starts automatic testing and simultaneously collects the temperatures at the inlet and outlet of the water pump to confirm that the three temperatures are within the allowable deviation range from the set temperature, thereby ensuring the normal operation of the electronic water pump performance test. Simultaneously, a level gauge is installed in the first medium tank to monitor the liquid level of the medium. When the liquid level is lower than the target lower limit, the electronic water pump test system is controlled to stop working. After the medium is replenished to the target liquid level, the electronic water pump test system is allowed to start automatic testing, thus ensuring the proper operation of the electronic water pump test system.

[0062] In addition to the improvements mentioned above, the electronic water pump testing system of this application can also be equipped with other components according to the needs of different scenarios. For example, a manual ball valve can be installed upstream and downstream of the electronic water pump under test. This manual ball valve is closed when not under test, so that the circuit can be cut off when disassembling and assembling the electronic water pump under test by closing the manual ball valves upstream and downstream of the pump. As another example, when the manual ball valve upstream of the electronic water pump under test is located at the outlet of the filter, a manual ball valve can also be installed at the inlet of the filter. This allows the circuit to be cut off by closing the manual ball valves at the filter's inlet and outlet, thus facilitating the disassembly and assembly of the filter.

[0063] This application provides an electronic water pump testing system, including a performance testing loop and a medium temperature control loop. In the performance testing loop, a PID control method is used to control the opening of the flow regulating valve, thereby adjusting the pressure difference between the water pump inlet and outlet to improve the adjustment accuracy. In the medium temperature control loop, two medium tanks are set up. After the medium is heated or cooled by a combined heating and cooling unit, it first flows back to the second medium tank. After thorough mixing, it flows back to the first medium tank through a low-level through-pipe and then enters the inlet of the electronic water pump, thus ensuring a stable inlet medium temperature. Simultaneously, an air source pressurization device is added to the top of the medium tank to simulate the actual operating conditions of the electronic water pump, thereby more realistically reflecting the working state of the electronic water pump in actual use and improving the accuracy of the test. In this way, fully automated testing of water pump performance is achieved, effectively reducing labor costs and improving testing efficiency.

[0064] like Figure 2 As shown, Figure 2 This is a flowchart of an electronic water pump testing method provided in an embodiment of this application. The method is applied to the control unit in the electronic water pump testing system described in any of the preceding system embodiments; the method includes:

[0065] Step 201: After controlling the integrated heating and cooling machine to heat or cool the medium to the target test temperature, control the air source pressurization device to adjust the air pressure in the first medium tank and the second medium tank to the target medium tank air pressure.

[0066] Step 202: Control the speed of the electronic water pump under test according to the preset water pump tachometer, control the inlet and outlet pressure difference of the electronic water pump under test according to the preset water pump differential pressure gauge, and use PID control method to control the opening of the flow regulating valve to adjust the inlet and outlet pressure difference of the electronic water pump under test to the corresponding pressure difference set value.

[0067] Step 203: After the inlet and outlet pressure difference of the electronic water pump under test stabilizes, collect the test parameters of the electronic water pump under test and save the collected test parameters in the database.

[0068] In this embodiment, the control unit controls the integrated heating and cooling unit to heat or cool the medium and continuously monitors the medium's temperature. Automatic testing only begins after the temperature reaches the target test temperature. Simultaneously, based on the set target medium tank pressure, the control unit controls the air source pressurization device to output the corresponding air pressure. Then, the control unit automatically controls the speed of the electronic water pump under test according to a preset water pump tachometer, and automatically controls the inlet and outlet pressure difference of the electronic water pump under test according to a preset water pump differential pressure gauge. A PID control method is used to adjust the pressure difference. Once the inlet and outlet pressure difference stabilizes, the control unit collects the flow rate, current, and voltage of the electronic water pump under test, and calculates parameters such as head, shaft power, and efficiency. Combining these with the pump performance test bench's own parameters, such as pipe diameter and inlet and outlet pressure measurement heights, the control unit calculates parameters such as the medium's velocity in the pump's inlet and outlet pipes and the critical net positive suction head (NPSH). These parameters are then automatically saved in the database. This completes the performance test of the electronic water pump under a combination of a speed point and a pressure difference point. Afterwards, the control unit can automatically test the next differential pressure setting value based on the water pump differential pressure gauge, repeating the above differential pressure adjustment and data acquisition steps until all differential pressure settings in the water pump differential pressure gauge have been tested. Then, it can automatically test the next speed setting value based on the water pump tachometer, repeating the differential pressure adjustment and data acquisition steps until all speed settings in the water pump tachometer have been tested. In this way, the performance testing of the electronic water pump under test conditions composed of different speed points and different differential pressure points can be achieved quickly and accurately.

[0069] In some embodiments, the system further includes: outputting alarm information when the electronic water pump testing system meets abnormal state conditions; the abnormal state conditions include any one of the following: the air pressure adjustment time in the first medium tank or the second medium tank exceeds a first preset time, and the air pressure does not reach the target medium tank air pressure; the temperature adjustment time of the medium exceeds a second preset time, and the temperature of the medium does not reach the target test temperature; the inlet and outlet pressure difference adjustment time of the electronic water pump under test exceeds a third preset time, and the inlet and outlet pressure difference does not reach the corresponding pressure difference setting value; the difference between the temperature of the medium in the first medium tank and the inlet and outlet temperatures of the electronic water pump under test is not within a preset temperature difference range; when the flow regulating valve is completely closed, the inlet and outlet pressure difference of the electronic water pump under test does not reach the corresponding pressure difference setting value. In other words, this electronic water pump testing system can also be equipped with an abnormal alarm function. The system will automatically alarm if the pressure adjustment in the medium tank fails to reach the set pressure within the timeout period; it will automatically alarm if the temperature adjustment in the medium tank fails to reach the set value within the timeout period; it will automatically alarm if the pressure difference adjustment between the inlet and outlet of the water pump fails to reach the set value within the timeout period; it will automatically alarm if the difference between the temperature of the medium in the medium tank and the temperature at the inlet and outlet of the water pump is outside the set range; and it will automatically alarm if the electronic water pump under test fails to reach the set value even with the flow control valve completely closed, indicating that the maximum outlet pressure of the water pump at this speed cannot reach the set value. In this case, the system will automatically alarm and skip the test at the current speed value, automatically entering the test at the next speed value to avoid long-term blockage of the water pump outlet. Thus, the introduction of an automatic alarm mechanism to deal with abnormal conditions enhances the safety and reliability of the testing system, while also improving the accuracy and reliability of the data.

[0070] Furthermore, in some embodiments, the method further includes: filtering corresponding test data from the database according to pre-set query conditions, plotting target performance curves based on the filtered test data, and outputting and displaying the results. In other words, the control unit can also provide a data query function, filtering corresponding data according to set query conditions, and plotting target performance curves, such as head-flow rate curves and net positive suction head-flow rate curves, to facilitate queries by testing personnel.

[0071] The target test temperature, target medium tank pressure, first preset time, second preset time, and third preset time mentioned above can be set according to the needs of specific scenarios. Furthermore, other improvements in the aforementioned system embodiments are also applicable to the method embodiments, and will not be elaborated upon here.

[0072] To provide a more detailed explanation of the solution in this application, a specific embodiment is described below:

[0073] This embodiment provides an electronic water pump testing system, which includes an electronic water pump performance testing device and a control system. The structure of the electronic water pump performance testing device is as follows: Figure 3 As shown, the electronic water pump performance testing device consists of the following three parts:

[0074] The performance test circuit is formed by sequentially connecting a first media tank 11, an electronic water pump under test 12, and a second media tank 13. A flow path is provided between the electronic water pump under test 12 and the second media tank 13. To accommodate the testing of electronic water pumps with different flow ranges, a dual-path design is adopted, namely, the flow path includes a first flow path and a second flow path connected in parallel. The first flow path is equipped with a first solenoid valve 161, a first flow meter 171, and a first flow regulating valve 181. The second flow path is equipped with a second solenoid valve 162, a second flow meter 172, and a second flow regulating valve 182. The pipe diameter of the first flow path is 15mm, which is suitable for the performance testing of water pumps with small flow rates. The pipe diameter of the second flow path is 40mm, which is suitable for the performance testing of water pumps with large flow rates. The first solenoid valve 161 and the second solenoid valve 162 are normally closed valves and are closed when not being tested. The first flow regulating valve 181 and the second flow regulating valve 182 are normally closed. The system is in a 100% open state and does not have a regulating function. When it is necessary to adjust the inlet and outlet pressure difference, the control system controls the data acquisition card to output a voltage of 0~10V, corresponding to the flow regulating valve opening of 100%~0%, thereby controlling the inlet and outlet pressure difference of the electronic water pump 12 under test. A first pressure gauge 19 and a second pressure gauge 20 are respectively installed upstream and downstream of the electronic water pump 12 under test to detect the inlet and outlet pressures of the electronic water pump 12 under test. A first thermometer 23 and a second thermometer 24 are respectively installed upstream and downstream of the electronic water pump 12 under test to detect the inlet and outlet pressures of the electronic water pump 12 under test. A first ball valve 25 and a second ball valve 26 are respectively installed upstream and downstream of the electronic water pump 12 under test. A third ball valve 27 and a filter 28 are connected in sequence between the first medium tank 11 and the first ball valve 25. Each ball valve is a manually controlled valve, which is closed when not being tested and opened when being tested. The filter is used to filter particulate impurities in the medium.

[0075] The medium temperature control circuit is formed by connecting the first medium tank 11, the temperature control water pump 14, the integrated heating and cooling unit 15, and the second medium tank 13 in sequence. After the medium is heated or cooled by the integrated heating and cooling unit 15, it first flows into the second medium tank 13. After being fully mixed, it flows back to the first medium tank 11 through the low-level through pipe and then enters the inlet of the electronic water pump 12 under test, thereby ensuring the stability of the medium temperature at the water pump inlet.

[0076] An air pressurization device, located on top of the medium tank, consists of an air source 211 and a proportional air pressure valve 212, used to simulate the actual working conditions of the electronic water pump 12 under test or to assist the electronic water pump 12 under test in starting normally; at the same time, a pressure relief device 213 can also be installed on top of the medium tank; in addition, a third thermometer 29 and a level gauge 30 are also installed in the first medium tank 11, used to monitor the temperature and level of the medium in the first medium tank 11 and feed them back to the control system.

[0077] The control system adopts, for example Figure 4 The workflow shown enables fully automated testing of the performance of electronic water pumps. This workflow includes:

[0078] S401. Obtain test conditions;

[0079] Specifically, before the test, test parameters are set, including a test speed list, a pressure difference list, and a list of the relationship between the electric water pump speed and duty cycle, so that the control system can automatically calculate the duty cycle corresponding to different test speeds based on this list; after the parameters are set, the electric water pump to be tested is installed on the test bench and the test can be carried out.

[0080] S402, Controlling the temperature of the medium in the integrated cooling and heating unit;

[0081] Specifically, the tester sets the test temperature on the control system. The control system uses Modbus communication to control the integrated heating and cooling machine to heat or cool the test medium to the corresponding temperature and continuously monitors the current temperature of the medium. Automatic testing can only be carried out after the temperature reaches the set value.

[0082] S403. Determine whether the medium temperature has reached the target test temperature. If yes, proceed to S406; otherwise, proceed to S404.

[0083] S404. Determine if the temperature adjustment timeout has occurred. If yes, execute S405; otherwise, return to S402.

[0084] S405 Output alarm, end test;

[0085] Specifically, the control system has an abnormal alarm function. In addition to the abnormal alarm settings in this workflow, the system will automatically alarm if the medium flow rate is continuously zero for more than the set value or the medium tank temperature exceeds the set upper and lower limits during manual and automatic control.

[0086] In addition, the control system can also have corresponding safety interlock functions: First, the system will automatically close the inlet and outlet solenoid valves of the water pump when starting and shutting down to prevent the solenoid valves from being opened accidentally or by misoperation, causing the medium in the medium tank to flow out; Second, in automatic control, the inlet and outlet solenoid valves of the water pump will be opened before starting the water pump; in manual control, the water pump cannot be started if the inlet and outlet solenoid valves are not open; Third, after the water pump starts, the inlet and outlet solenoid valves cannot be closed manually, and they can only be closed after the water pump stops running; the above abnormal information is automatically saved in the error log.

[0087] S406. Adjust the air pressure in the medium tank;

[0088] Specifically, the control system, based on the set medium tank air pressure, outputs an analog signal through the AO (Analog Output) port to control the air pressure proportional valve to output the corresponding air pressure, thereby controlling the air pressure inside the medium tank.

[0089] S407. Determine whether the medium tank pressure has reached the target medium tank pressure. If yes, execute SS409; otherwise, execute S408.

[0090] S408. Determine if the air pressure regulation has timed out. If yes, execute S405; otherwise, return to S406.

[0091] S409. Automatically control the water pump speed according to the set speed list;

[0092] Specifically, the control system sends and receives SCPI (Standard Commands for Programmable Instruments) commands via sockets to query and control parameters such as the power supply's output voltage and maximum output current. Based on the set relationship curve between the pump speed and duty cycle, the control system automatically calculates the required PWM duty cycle according to the corresponding pump speed table, and controls the data acquisition card to output the PWM signal with the corresponding duty cycle, thereby controlling the pump speed.

[0093] S410: Automatically controls the pressure difference between the inlet and outlet of the water pump according to the set pressure difference list;

[0094] S411. Use PID control method to adjust the pressure difference between the inlet and outlet of the water pump;

[0095] S412. Determine whether the inlet and outlet pressure difference has reached the corresponding test pressure difference value. If yes, execute S415; otherwise, execute S413.

[0096] S413. Determine whether the flow regulating valve is completely closed. If yes, execute S421; otherwise, execute S414.

[0097] S414. Determine if the differential pressure regulation has timed out. If yes, execute S405; otherwise, return to S411.

[0098] S415. Determine whether the difference between the inlet and outlet temperatures of the water pump and the temperature of the medium tank is within the allowable error range. If yes, proceed to S418; otherwise, proceed to S416.

[0099] S416, Wait for preset time;

[0100] S417. Determine whether the accumulated waiting time exceeds the upper limit of the waiting time, i.e. whether the waiting has timed out. If yes, execute S405; otherwise, return to S415.

[0101] S418. Record the test data and save it in the database;

[0102] Specifically, after the pressure difference between the inlet and outlet of the water pump stabilizes, the control system collects the water pump flow rate, current, and voltage, and calculates parameters such as head, shaft power, and efficiency. Based on the parameters of the water pump performance test bench itself, such as pipe diameter and water pump inlet and outlet pressure measurement height, it calculates parameters such as the medium velocity in the water pump inlet and outlet pipes and the critical net positive suction head, and automatically saves these parameters in the SQLite database.

[0103] S419. End the test of the current differential pressure value;

[0104] S420. Determine whether the test of all differential pressures in the differential pressure list has been completed. If yes, execute S421; otherwise, return to S410.

[0105] S421. End the test of the current test speed value;

[0106] S422. Determine whether the test of all speeds in the speed list has been completed. If yes, execute S423; otherwise, return to S409.

[0107] S423. After completing the test, shut off the gas source, solenoid valve, etc., and replace the test sample.

[0108] This embodiment of the electronic water pump testing system enables fully automated testing of water pump performance. It employs a flow regulating valve to adjust the water pump pressure difference and uses PID control to control the valve's opening. The electronic control offers high precision and fast response, effectively improving testing efficiency. Furthermore, it utilizes an ACID-compliant relational database management system, specifically SQLite, to record and store test data. Test data for each sample is stored in a table, facilitating later querying, comparison, and maintenance. Advanced query techniques such as LINQ can be used to filter query results based on specific conditions and plot performance curves for each sample, thereby significantly enhancing the user experience for testers.

[0109] Corresponding to the embodiments of the aforementioned methods, this application also provides embodiments of an electronic water pump testing device and its application terminal:

[0110] like Figure 5 As shown, Figure 5 This is a block diagram of an electronic water pump testing device provided in an embodiment of this application. The device is applied to the control unit of the electronic water pump testing system described in any of the preceding system embodiments; the device includes:

[0111] Control module 51 is used to control the air source pressurization device to adjust the air pressure in the first medium tank and the second medium tank to the target medium tank air pressure after controlling the integrated heating and cooling machine to heat or cool the medium to the target test temperature.

[0112] The control module 51 is also used to control the speed of the electronic water pump under test according to a preset water pump tachometer, control the inlet and outlet pressure difference of the electronic water pump under test according to a preset water pump differential pressure gauge, and use PID control method to control the opening of the flow regulating valve to adjust the inlet and outlet pressure difference of the electronic water pump under test to the corresponding pressure difference set value.

[0113] The storage module 52 is used to collect the test parameters of the electronic water pump under test after the inlet and outlet pressure difference of the electronic water pump under test has stabilized, and to save the collected test parameters in the database.

[0114] The specific implementation process of the functions and roles of each module in the above device can be found in the implementation process of the corresponding steps in the above method, and will not be repeated here.

[0115] This application also provides an electronic device, please refer to [link to application]. Figure 6 , Figure 6 This is a structural block diagram of an electronic device provided in an embodiment of this application. The electronic device may include a processor 610, a communication interface 620, a memory 630, and at least one communication bus 640. The communication bus 640 is used to enable direct communication between these components. In this embodiment, the communication interface 620 of the electronic device is used for signaling or data communication with other node devices. The processor 610 may be an integrated circuit chip with signal processing capabilities.

[0116] The processor 610 described above can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor, or the processor 610 can be any conventional processor.

[0117] The memory 630 may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc. The memory 630 stores computer-readable instructions. When these computer-readable instructions are executed by the processor 610, the electronic device can perform the aforementioned operations. Figure 2 The various steps involved in the method implementation examples.

[0118] Alternatively, the electronic device may also include a storage controller and an input / output unit.

[0119] The memory 630, storage controller, processor 610, peripheral interface, and input / output unit are electrically connected directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses 640. The processor 610 is used to execute executable modules stored in the memory 630, such as software function modules or computer programs included in electronic devices.

[0120] The input / output unit is used to provide users with the ability to create tasks and to set optional start periods or preset execution times for those tasks, thereby enabling user-server interaction. The input / output unit may be, but is not limited to, a mouse and keyboard.

[0121] Understandable. Figure 6 The structure shown is for illustrative purposes only; the electronic device may also include components that are more advanced than those shown. Figure 6 The more or fewer components shown, or having the same Figure 6 The different configurations shown. Figure 6 The components shown can be implemented using hardware, software, or a combination thereof.

[0122] This application also provides a storage medium storing instructions. When the instructions are run on a computer, the computer program is executed by a processor to implement the method described in the method embodiment. To avoid repetition, the method will not be described again here.

[0123] This application also provides a computer program product that, when run on a computer, causes the computer to perform the method described in the method embodiment.

[0124] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0125] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0126] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0127] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0128] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0129] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. An electronic water pump testing system, characterized in that, This includes a performance test circuit formed by sequentially connecting a first media tank, an electronic water pump under test, and a second media tank; and a media temperature control circuit formed by sequentially connecting the first media tank, a temperature-controlled water pump, a combined cooling and heating unit, and the second media tank; wherein: In the performance test circuit, a flow path is provided between the electronic water pump under test and the second medium tank. The flow path is equipped with a solenoid valve, a flow meter, and a flow regulating valve. In the performance test circuit, a first pressure gauge and a second pressure gauge are respectively provided upstream and downstream of the electronic water pump under test to detect the inlet and outlet pressures of the electronic water pump under test. A low-level through pipe is provided between the first medium tank and the second medium tank; the top of the first medium tank and the top of the second medium tank are both connected to an air source pressurization device; the air source pressurization device is used to control the air pressure in the first medium tank and the second medium tank to simulate the actual working conditions of the electronic water pump under test; the temperature-controlled water pump is used to transfer the medium in the first medium tank to the integrated heating and cooling machine for heating or cooling. The electronic water pump testing system also includes a control unit, which is used to collect test data of the electronic water pump under test, and to control the speed of the electronic water pump under test during the performance test of the electronic water pump under test, and to control the opening of the flow regulating valve by using a PID control method to adjust the inlet and outlet pressure difference of the electronic water pump under test. The performance test circuit includes a first thermometer and a second thermometer installed upstream and downstream of the electronic water pump under test, respectively, to detect the inlet and outlet temperatures of the electronic water pump under test. The control unit is also used to verify the effectiveness of the test based on the difference between the inlet and outlet temperatures.

2. The electronic water pump testing system according to claim 1, characterized in that, The flow path includes a first flow path and a second flow path arranged in parallel; the solenoid valve, flow meter and flow regulating valve respectively include a first solenoid valve, a first flow meter and a first flow regulating valve arranged in the first flow path and a second solenoid valve, a second flow meter and a second flow regulating valve arranged in the second flow path; the pipe diameter of the first flow path is smaller than the pipe diameter of the second flow path.

3. The electronic water pump testing system according to claim 2, characterized in that, The control unit is further configured to: when the flow rate of the electronic water pump under test is determined to correspond to the pipe diameter of the first flow passage according to the calibration table, control the first solenoid valve to open and control the second solenoid valve to close; when the flow rate of the electronic water pump under test is determined to correspond to the pipe diameter of the second flow passage according to the calibration table, control the first solenoid valve to close and control the second solenoid valve to open; the calibration table records the available flow range corresponding to different pipe diameters.

4. The electronic water pump testing system according to claim 1, characterized in that, The gas source pressurization device includes a gas source and a gas pressure proportional valve; the gas pressure proportional valve is used to control the gas pressure output by the gas source to the first medium tank and the second medium tank.

5. The electronic water pump testing system according to claim 1, characterized in that, The performance test circuit is further equipped with a filter between the first medium tank and the electronic water pump under test; the filter is used to filter impurities in the medium.

6. The electronic water pump testing system according to claim 1, characterized in that, The first medium tank is equipped with a third thermometer and a level gauge.

7. A method for testing an electronic water pump, characterized in that, The method is applied to a control unit in the electronic water pump testing system as described in any one of claims 1 to 6; the method includes: After controlling the integrated heating and cooling unit to heat or cool the medium to the target test temperature, the air source pressurization device is controlled to adjust the air pressure in the first medium tank and the second medium tank to the target medium tank air pressure. The speed of the electronic water pump under test is controlled according to the preset water pump tachometer, and the inlet and outlet pressure difference of the electronic water pump under test is controlled according to the preset water pump differential pressure gauge. The opening of the flow regulating valve is controlled by the PID control method to adjust the inlet and outlet pressure difference of the electronic water pump under test to the corresponding pressure difference set value. After the inlet and outlet pressure difference of the electronic water pump under test stabilizes, the test parameters of the electronic water pump under test are collected and saved in the database.

8. The electronic water pump testing method according to claim 7, characterized in that, Also includes: When the electronic water pump testing system meets the abnormal state conditions, it outputs an alarm message; The abnormal state condition includes any one of the following: The air pressure adjustment time in the first medium tank or the second medium tank exceeds the first preset time, and the air pressure does not reach the target medium tank air pressure; The temperature adjustment time of the medium exceeds the second preset time, and the temperature of the medium does not reach the target test temperature; The inlet and outlet pressure difference adjustment time of the electronic water pump under test exceeds the third preset time, and the inlet and outlet pressure difference does not reach the corresponding pressure difference set value; The temperature difference between the medium in the first medium tank and the inlet and outlet temperatures of the electronic water pump under test is not within the preset temperature difference range; When the flow regulating valve is fully closed, the inlet and outlet pressure difference of the electronic water pump under test does not reach the corresponding pressure difference setting value.

9. The electronic water pump testing method according to claim 7, characterized in that, Also includes: Based on the pre-set query conditions, the corresponding test data is filtered from the database, and the target performance curve is plotted and displayed based on the filtered test data.

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