Automobile electronic water pump reliability test method and system

Abstract

The application provides a reliability test method and system for an automotive electronic water pump. First, the inlet voltage of the measured electronic water pump is adjusted to a design value, and the coolant temperature at the inlet of the measured electronic water pump is regulated to a target temperature; the speed of the measured electronic water pump is constant or the coolant flow at the inlet is constant, the coolant flow at the inlet of the measured electronic water pump or the speed of the water pump is changed, the inlet and outlet pressure difference, current and flow of the measured electronic water pump are collected in real time, the real-time comprehensive efficiency of the measured electronic water pump is calculated, the real-time comprehensive efficiency curve is drawn according to the obtained multiple real-time comprehensive efficiencies, and finally, the real-time comprehensive efficiency curve is compared with the ideal comprehensive efficiency curve under the current corresponding working condition, and the reliability verification of the measured electronic water pump is completed. The application can realize the reliability measurement of the variable flow and variable speed of the electronic water pump, and can effectively verify whether the electronic water pump meets the reliability design target.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of testing of automobile engine parts, and in particular to a reliability testing method and system for an automobile electronic water pump. BACKGROUND

[0002] In order to obtain better heating effect and fuel economy, more and more engines now start to use electronic water pumps. Electronic water pumps have the advantages of small size, automatic speed adjustment according to engine power conditions, etc., and belong to key components of new energy vehicles.

[0003] Whether the electronic water pump meets the reliability use requirements of the engine cooling system needs to be measured. The cooling liquid temperature of the existing common electronic water pump reliability test device is not adjustable, which cannot guarantee the stability of the reliability test, or the cooling liquid temperature of part of the test device is adjustable, but the test device lacks the function of keeping the cooling liquid at a constant temperature during the test, which also affects the stability of the test. The common electronic water pump reliability test method is mostly single through the measurement of the constant flow or constant speed of the electronic water pump, and cannot simulate the actual use condition of the electronic water pump on the vehicle, which cannot effectively verify whether the electronic water pump meets the reliability design target of actual use, and cannot achieve the purpose of reliability examination. SUMMARY

[0004] The present application provides a reliability testing method and system for an automobile electronic water pump, which has the functions of automatically adjusting the cooling liquid temperature and keeping it at a constant temperature, can realize the reliability measurement of variable flow and variable speed of the electronic water pump, and can effectively verify whether the electronic water pump meets the reliability design target.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A reliability testing method for an automobile electronic water pump, comprising the following processes:

[0007] Adjusting the inlet voltage of the measured electronic water pump to the design value;

[0008] Adjusting the cooling liquid temperature at the inlet of the measured electronic water pump to the target temperature;

[0009] Keeping the speed of the measured electronic water pump constant, changing the cooling liquid flow at the inlet of the measured electronic water pump, and collecting the inlet and outlet pressure difference, current and flow of the measured electronic water pump in real time to calculate the real-time comprehensive efficiency of the measured electronic water pump under different flows at a constant speed;

[0010] Or order input electronic water pump inlet flow constant, change the speed of the measured electronic water pump, real-time acquisition of the measured electronic water pump inlet and outlet pressure difference, current, flow, calculate the measured electronic water pump at constant flow, different speed of real-time comprehensive efficiency;

[0011] According to the obtained multiple real-time comprehensive efficiency, a real-time comprehensive efficiency curve is drawn;

[0012] The real-time comprehensive efficiency curve is compared with the ideal comprehensive efficiency curve corresponding to the current working condition, and the reliability verification of the measured electronic water pump is completed.

[0013] The inlet voltage and inlet coolant temperature of the measured electronic water pump are set first, and then the measured electronic water pump is tested at constant speed or constant flow, the inlet and outlet pressure difference, current and flow data of the measured electronic water pump under two different working conditions are collected in real time when the speed is changed at constant flow or the flow is changed at constant speed; Then a real-time comprehensive efficiency curve corresponding to the current working condition is calculated according to the above data, and the curve is compared with the ideal curve corresponding to the current working condition to verify whether there is a deviation within the allowable error range, if the deviation exceeds, it is considered that it does not meet the reliability test requirements, otherwise it meets the requirements.

[0014] In subsequent tests, different inlet coolant temperatures can be reset, and the above test steps are continued based on this, that is, the present application can set multiple different working condition parameters to realize the reliability test of variable speed or variable flow under different coolant temperatures, to enrich the reliability test of electronic water pump under multiple working conditions, and to meet the reliability requirements in actual use.

[0015] Further, the ideal comprehensive efficiency curve corresponding to the current working condition refers to:

[0016] If the real-time comprehensive efficiency curve is obtained based on constant speed, the ideal comprehensive efficiency curve corresponding to the current working condition is the ideal comprehensive efficiency curve under the same speed.

[0017] If the real-time comprehensive efficiency curve is obtained based on constant flow, the ideal comprehensive efficiency curve corresponding to the current working condition is the ideal comprehensive efficiency curve under the same flow.

[0018] The ideal comprehensive efficiency curve is obtained according to the reliability standard requirements of the measured electronic water pump, and is a standard curve.

[0019] The ideal comprehensive efficiency curve compared in the application is measured based on a standard electronic water pump meeting reliability requirements, is a standard curve, can be prepared in advance, and is different under different corresponding working conditions. The real-time comprehensive efficiency curves under different working conditions obtained in the test process are compared with the ideal curve. When the real-time curve is obtained, the comparison and verification can be quickly performed. At the same time, the differences between the ideal curves and the corresponding real-time curves under different working conditions can be observed through multiple windows, and the differences between the real-time curves of the same electronic water pump under different working conditions are observed. If the real-time curves meet the reliability requirements, it is proved that the reliability of the electronic water pump under multiple working conditions is met, the stability of the overall reliability test of the electronic water pump is improved, and the reliability requirements in the actual use process are met.

[0020] Further, the formula for calculating the real-time comprehensive efficiency F is as follows:

[0021] F = W1 / W2;

[0022] In the above formula, W1 is the effective power of the measured electronic water pump, and W2 is the consumed electric power of the measured electronic water pump.

[0023] The calculation formula of W1 is as follows:

[0024] W1 = Q m × H × ρ × g;

[0025] In the above formula, Q m is the flow rate of the measured electronic water pump, ρ is the density of the cooling liquid, H is the lift of the measured electronic water pump, and g is the acceleration of gravity.

[0026] The calculation formula of H is as follows:

[0027] H = ΔP / ρg + ΔC / 2g + ΔZ ;

[0028] In the formula, ΔC is the outlet-inlet flow rate difference of the measured electronic water pump, ΔZ is the outlet-inlet height difference of the measured electronic water pump, and ΔP is the outlet-inlet pressure difference of the measured electronic water pump.

[0029] The calculation formula of ΔP is as follows:

[0030] ΔP = P1-P2;

[0031] In the formula, P1 is the outlet pressure of the measured electronic water pump, and P2 is the inlet pressure of the measured electronic water pump.

[0032] The calculation formula of W2 is as follows:

[0033] W2 = U × I;

[0034] In the formula, U is the inlet voltage of the measured electronic water pump, and I is the current of the measured electronic water pump.

[0035] In the present application, the real-time comprehensive efficiency of the measured electronic water pump is calculated according to the collected inlet voltage, current, flow rate, and pressure difference between the inlet and outlet. Under different conditions, multiple real-time comprehensive efficiencies are calculated, and the values of the multiple real-time comprehensive efficiencies are fitted to draw a real-time comprehensive efficiency curve for display. Through image comparison between the real-time comprehensive efficiency curve and an ideal comprehensive efficiency curve, reliability verification can be performed intuitively and quickly.

[0036] Further, the design value is a fixed value, which is an input constant voltage value for the measured electronic water pump, and provides a stable voltage for the measured electronic water pump.

[0037] The design value is a set voltage value for the measured electronic water pump, which aims to ensure the stability of the voltage of the measured electronic water pump and avoid affecting subsequent data collection. The design value can be set according to the reliability test working condition requirements of the electronic water pump.

[0038] Further, the specific process of regulating the cooling liquid temperature at the inlet of the measured electronic water pump to the target temperature is as follows:

[0039] When the cooling liquid temperature at the inlet of the measured electronic water pump is lower than the target temperature, a heating device is connected in the cooling liquid circulation loop to heat the cooling liquid in the pipeline, so that the heated cooling liquid flows out to the measured electronic water pump. When the cooling liquid temperature at the inlet of the measured electronic water pump reaches the target temperature, the heating device is turned off.

[0040] When the cooling liquid temperature at the inlet of the measured electronic water pump is higher than the target temperature, a cooling device is connected in the cooling liquid circulation loop to cool the cooling liquid in the pipeline, so that the cooled cooling liquid flows out to the measured electronic water pump. When the cooling liquid temperature at the inlet of the measured electronic water pump reaches the target temperature, the cooling device is turned off.

[0041] The cooling liquid temperature is regulated in real time by the heating device and the cooling device, so that the cooling liquid flowing into the inlet of the measured electronic water pump is maintained within the target temperature range.

[0042] In actual electronic water pump use, the temperature of circulating coolant in the electronic water pump is unstable due to the fact that heat dissipation is not timely or circulation is too much, when the reliability of the electronic water pump is tested, the temperature of the coolant is unstable, which will affect the collected data, and further affect the stability of the reliability verification. Therefore, in order to better simulate the actual use, and not to affect the data collection, the heating device and the cooling device are added to regulate the temperature of the coolant input into the electronic water pump under test in the circulation process of the electronic water pump under test, the coolant is heated or cooled, and the system is automatically kept constant temperature after the coolant reaches the target temperature, so that the electronic water pump under test is not affected by the temperature change of the coolant when collecting data, and the stability of the test is ensured.

[0043] Further, the values of the inlet and outlet pressure difference, current and flow rate collected in real time are monitored, and if the values exceed the corresponding normal range, an alarm is given to prompt the operator that there is an abnormality in the current test process, and the test should be stopped.

[0044] When data abnormality occurs in the test process, it indicates that the electronic water pump under test has hidden dangers, and an alarm should be given immediately to prompt the operator to stop the test quickly, thereby improving the safety of the test.

[0045] The application also provides an automobile electronic water pump reliability test system for realizing the automobile electronic water pump reliability test method.

[0046] The pump measurement system comprises a liquid storage tank, a measured electronic water pump and an electronic throttle valve, the liquid storage tank stores coolant, the outlet of the liquid storage tank is communicated with the inlet of the measured electronic water pump, the outlet of the measured electronic water pump is communicated with one end of the electronic throttle valve, the other end of the electronic throttle valve is communicated with the inlet of the liquid storage tank, a temperature measurement element and a first pressure measurement element are arranged between the liquid storage tank and the measured electronic water pump, a second pressure measurement element is arranged between the measured electronic water pump and the electronic throttle valve, and a flow measurement element is arranged between the electronic throttle valve and the liquid storage tank.

[0047] The control system is electrically connected with the measured electronic water pump, the electronic throttle valve, the temperature measurement element, the first pressure measurement element, the second pressure measurement element, the flow measurement element and the temperature control system respectively.

[0048] The driving device provides voltage for the measured electronic water pump, so that the inlet voltage of the measured electronic water pump is kept as the design value.

[0049] The temperature control system is used for heating or cooling the coolant in the liquid storage tank.

[0050] The control system is used for controlling the rotating speed of the measured electronic water pump, controlling the temperature control system to adjust the temperature of the cooling liquid in the liquid storage tank, and controlling the opening degree of the electronic throttle valve.

[0051] The control system directly collects the rotating speed, inlet voltage and current data of the measured electronic water pump, collects the flow data of the measured electronic water pump through the flow measuring element, collects the inlet and outlet pressure difference data of the measured electronic water pump through the first and second pressure measuring elements, and collects the cooling liquid temperature data at the inlet of the measured electronic water pump through the temperature measuring element.

[0052] The control system calculates the real-time comprehensive efficiency of the measured electronic water pump according to the inlet voltage, current, flow and inlet and outlet pressure difference of the measured electronic water pump, draws a real-time comprehensive efficiency curve according to multiple real-time comprehensive efficiencies, and compares and verifies the real-time comprehensive efficiency curve with an ideal comprehensive efficiency curve under corresponding working conditions to determine the reliability of the current measured electronic water pump.

[0053] The inlet voltage of the measured electronic water pump is first adjusted to a design value by the driving device to provide a stable voltage for the measured electronic water pump, and then the temperature of the cooling liquid at the inlet of the measured electronic water pump is adjusted by the temperature control system, the temperature control system adjusts the temperature of the cooling liquid to a target temperature according to the input instruction of the control system, and the temperature of the cooling liquid is kept constant after reaching the target temperature, and the adjusted cooling liquid flows into the measured electronic water pump through the liquid storage tank.

[0054] At this time, the control system keeps the rotating speed of the measured electronic water pump constant, and then controls the opening degree of the electronic throttle valve to change the flow of the cooling liquid at the inlet of the electronic water pump, when the flow changes, the load of the measured electronic water pump changes, since the voltage provided by the driving device is unchanged, the control system can measure the inlet and outlet pressure changes of the water pump in real time through the first and second pressure measuring elements, measure the flow changes of the water pump in real time through the flow measuring element, and directly collect the current changes of the water pump.

[0055] Or at this time, the control system keeps the opening degree of the electronic throttle valve unchanged, and then adjusts the rotating speed of the measured electronic water pump, when the rotating speed changes, the flow of the measured electronic water pump changes, since the voltage provided by the driving device is unchanged, the control system can measure the inlet and outlet pressure changes of the water pump in real time through the first and second pressure measuring elements, measure the flow changes of the water pump in real time through the flow measuring element, and directly collect the current changes of the water pump.

[0056] The last control system edits and inputs the above obtained working condition changes, the working condition includes: inlet voltage, inlet coolant temperature, throttle opening, water pump rotating speed, and in the test process, the test data of water pump inlet voltage, water pump current, water pump inlet and outlet pressure difference, water pump flow rate and the like are collected in real time, and the test data is monitored and stored, and the real-time comprehensive efficiency of the electronic water pump under different working conditions is calculated according to the above test data, and the corresponding real-time comprehensive efficiency curve is drawn, and compared with the corresponding ideal comprehensive efficiency curve stored in the control system in advance, and finally the verification result can be output by the control system.

[0057] Through the above test system, the reliability test of the electronic water pump under different working conditions can be effectively and stably carried out, so as to verify the reliability test of the electronic water pump under multiple variables, make the reliability test of the electronic water pump more close to the actual working condition, and improve the accuracy of the reliability verification of the electronic water pump.

[0058] Further, the temperature control system comprises a pneumatic device, a cooling device, a heating device and a transfer box;

[0059] The transfer box is communicated with the cooling device, the heating device and the liquid storage tank through pipelines respectively, a first normally closed valve is arranged in the pipeline between the cooling device and the transfer box, a second normally closed valve is arranged in the pipeline between the heating device and the transfer box, and the two valves are pneumatically controlled by the pneumatic device to realize opening and closing.

[0060] The principle of temperature control of the temperature control system is as follows:

[0061] The control system collects the real-time temperature of the cooling liquid at the inlet of the measured electronic water pump through a temperature measuring element;

[0062] When the cooling liquid temperature here is lower than the target temperature, the control system opens the second normally closed valve through the pneumatic device connected with compressed air, at this time, the cooling liquid circulates between the transfer box and the heating device, the heating resistance wire in the heating device heats the cooling liquid flowing into the pipeline of the heating device, and when the temperature collected by the temperature measuring element reaches the target temperature, the control system closes the second normally closed valve through the pneumatic device, and stops the work of the heating device, and the heating is completed.

[0063] When the cooling liquid temperature here is higher than the target temperature, the control system opens the first normally closed valve through the pneumatic device connected with compressed air, at this time, the cooling liquid circulates between the transfer box and the cooling device, the cooling device is connected with circulating water, the circulating water cools the cooling liquid flowing into the pipeline of the cooling device, and when the temperature collected by the temperature measuring element reaches the target temperature, the control system closes the first normally closed valve through the pneumatic device, and stops the work of the cooling device, and the cooling is completed.

[0064] Further, the system further comprises a liquid supplementing device, the liquid supplementing device comprising a liquid supplementing tank and a resistance element for heat dissipation, the resistance element being arranged between the electronic throttle valve and the liquid storage tank and being provided with a gas overflow port, a liquid outlet at the bottom of the liquid supplementing tank being communicated with the top of the liquid storage tank, and the gas overflow port of the resistance element being communicated with a gas inlet at the top of the liquid supplementing tank through a gas pipe.

[0065] After the cooling liquid flows out of the electronic throttle valve, the cooling liquid flows through the resistance element simulating the function of the whole vehicle radiator, at this time, the cooling liquid is partially vaporized to form steam due to the heat dissipation effect, and the steam is discharged into the liquid supplementing tank from the gas overflow port, thereby reducing the cooling liquid flowing back into the liquid storage tank, and at this time, the internal pressure of the liquid supplementing tank is increased due to the gas filled therein, and the cooling liquid in the liquid supplementing tank is pressed downward to flow into the liquid storage tank, so as to complete the supplement of the cooling liquid. Such a cycle maximizes the simulation of the whole vehicle layout of the electronic water pump, and realizes the pressure maintaining and pressure releasing functions of the whole system through the liquid supplementing device, while ensuring the stability of the cooling liquid in the circulating loop.

[0066] Further, the system further comprises a warning device, the warning device being electrically connected with the control system;

[0067] When any one of the cooling liquid temperature at the inlet of the measured electronic water pump, the pressure difference between the inlet and outlet of the measured electronic water pump, the current, and the flow rate exceeds the corresponding normal range, the control system performs voice warning through the warning device to prompt the operator that there is an abnormality in the current test process, and the test should be stopped.

[0068] By monitoring whether the data is abnormal in real time, the operator can be warned in time, and the operation safety in the test process is ensured.

[0069] The beneficial effects of the present application are as follows:

[0070] The present application firstly adjusts the cooling liquid temperature at the inlet of the measured electronic water pump and the inlet voltage of the measured electronic water pump in the test process according to the test working condition requirements, ensures the constant cooling liquid temperature before the test and the constant voltage of the water pump, so as to improve the stability during the reliability test; during the test, the rotation speed of the measured electronic water pump is set to perform the variable flow test, or the flow of the measured electronic water pump is set to perform the variable rotation speed test, the inlet and outlet pressure difference, current and flow data of the measured electronic water pump during the test process are collected in real time, finally the real-time comprehensive efficiency curve is obtained according to the data, and the real-time comprehensive efficiency curve is compared with the ideal comprehensive efficiency curve under the corresponding working condition, so that the reliability of the water pump can be quickly verified. Compared with the traditional single temperature or single flow or single rotation speed reliability test, the test working condition of the present application can also be designed for individual reliability test according to different types of electronic water pumps, after adjusting the test working condition, the variable flow or variable rotation speed measurement is performed, which is closer to the actual working condition of the electronic water pump used on the whole vehicle, and whether the electronic water pump meets the reliability design target can be effectively verified. BRIEF DESCRIPTION OF DRAWINGS

[0071] Figure 1 A flowchart of a reliability test method for an automotive electronic water pump according to the present application;

[0072] Figure 2 A structure diagram of a reliability test system for an automotive electronic water pump according to the present application;

[0073] Figure 3 A structure diagram of a pump measurement system;

[0074] Figure 4 A temperature control principle diagram of a temperature control system. DETAILED DESCRIPTION

[0075] The embodiments of the present application will be described hereinafter with reference to the drawings and preferred embodiments, and other advantages and effects of the present application can be easily understood by those skilled in the art from the contents disclosed in the present specification. The present application can also be implemented or applied by means of other different specific embodiments, and each detail in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, but not for limiting the protection scope of the present application.

[0076] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the diagrams, but not drawn according to the number, shape and size of the components during actual implementation, and the type, number and proportion of each component during actual implementation can be arbitrarily changed, and the component layout type can also be more complex.

[0077] Example 1:

[0078] As shown in Figure 1 An automobile electronic water pump reliability test method, comprising the following processes:

[0079] Adjusting the inlet voltage of the measured electronic water pump to a design value;

[0080] Regulating the coolant temperature at the inlet of the measured electronic water pump to a target temperature;

[0081] Keeping the rotating speed of the measured electronic water pump constant, changing the coolant flow rate input into the inlet of the measured electronic water pump, collecting the inlet and outlet pressure difference, current and flow rate of the measured electronic water pump in real time, and calculating the real-time comprehensive efficiency of the measured electronic water pump under different flow rates when the rotating speed is constant;

[0082] Or keeping the coolant flow rate input into the inlet of the measured electronic water pump constant, changing the rotating speed of the measured electronic water pump, collecting the inlet and outlet pressure difference, current and flow rate of the measured electronic water pump in real time, and calculating the real-time comprehensive efficiency of the measured electronic water pump under different rotating speeds when the flow rate is constant;

[0083] Drawing a real-time comprehensive efficiency curve according to the obtained multiple real-time comprehensive efficiencies;

[0084] Comparing the real-time comprehensive efficiency curve with an ideal comprehensive efficiency curve corresponding to the current working condition, and completing the reliability verification of the measured electronic water pump.

[0085] In the embodiment, the design value is a voltage constant value set for the measured electronic water pump, which aims to ensure the stability of the voltage of the measured electronic water pump and avoid affecting the subsequent data collection. The design value can be set according to the reliability test working condition requirements of the electronic water pump.

[0086] In the embodiment, the specific process of regulating the coolant temperature at the inlet of the measured electronic water pump to the target temperature is as follows:

[0087] When the coolant temperature at the inlet of the measured electronic water pump is lower than the target temperature, a heating device is connected in the circulating loop of the coolant to heat the coolant in the pipeline, so that the heated coolant flows out to the measured electronic water pump, until the coolant temperature at the inlet of the measured electronic water pump reaches the target temperature, and the heating device is turned off;

[0088] When the coolant temperature at the inlet of the measured electronic water pump is higher than the target temperature, a cooling device is connected in the circulating loop of the coolant to cool the coolant in the pipeline, so that the cooled coolant flows out to the measured electronic water pump, until the coolant temperature at the inlet of the measured electronic water pump reaches the target temperature, and the cooling device is turned off;

[0089] The cooling liquid temperature flowing into the inlet of the electronic water pump under test is maintained within the target temperature range by regulating the heating device and the cooling device in real time.

[0090] In actual use of the electronic water pump, the temperature of the circulating cooling liquid in the electronic water pump is unstable due to insufficient heat dissipation or excessive circulation. When the reliability of the electronic water pump is tested, the collected data is affected due to the unstable temperature of the cooling liquid, thereby affecting the stability of the reliability verification. Therefore, in order to better simulate the actual use and not affect the data collection, the heating device and the cooling device are added to regulate the temperature of the cooling liquid input into the electronic water pump under test during the circulation of the electronic water pump under test. The cooling liquid is heated or cooled, and the system is automatically kept constant temperature after the cooling liquid reaches the target temperature, so that the electronic water pump under test is not affected by the temperature change of the cooling liquid when collecting data, and the stability of the test is ensured.

[0091] In the embodiment, the formula for calculating the real-time comprehensive efficiency F is as follows:

[0092] F=W1 / W2;

[0093] In the above formula, W1 is the effective power of the electronic water pump under test, and W2 is the consumed electric power of the electronic water pump under test.

[0094] The calculation formula of W1 is as follows:

[0095] W1=Q m ×H×ρ×g;

[0096] In the above formula, Q m is the flow rate of the electronic water pump under test, ρ is the density of the cooling liquid, H is the lift of the electronic water pump under test, and g is the acceleration of gravity.

[0097] The calculation formula of H is as follows:

[0098] H=ΔP / ρg+ΔC / 2g+ΔZ;

[0099] In the formula, ΔC is the difference between the outlet and inlet flow rates of the electronic water pump under test, which is small and can be ignored, and is taken as 0 here. ΔZ is the difference between the outlet and inlet heights of the electronic water pump under test, which is small and can be ignored, and is taken as 0 here. ΔP is the difference between the outlet and inlet pressures of the electronic water pump under test.

[0100] The calculation formula of ΔP is as follows:

[0101] ΔP=P1-P2;

[0102] In the formula, P1 is the outlet pressure of the electronic water pump under test, and P2 is the inlet pressure of the electronic water pump under test.

[0103] The calculation formula of W2 is as follows:

[0104] W2= U×I;

[0105] In the formula, U is the inlet voltage of the measured electronic water pump, and I is the current of the measured electronic water pump.

[0106] In the present application, the real-time comprehensive efficiency of the measured electronic water pump is calculated according to the collected inlet voltage, current, flow rate, and pressure difference between the inlet and outlet. Under different conditions, multiple real-time comprehensive efficiencies are calculated, and the values of the multiple real-time comprehensive efficiencies are fitted to draw a real-time comprehensive efficiency curve for display. Through image comparison between the real-time comprehensive efficiency curve and the ideal comprehensive efficiency curve, reliability verification can be performed intuitively and quickly.

[0107] In the present embodiment, the ideal comprehensive efficiency curve under the current corresponding working condition refers to:

[0108] If the real-time comprehensive efficiency curve is obtained based on constant speed, the ideal comprehensive efficiency curve under the current corresponding working condition is the ideal comprehensive efficiency curve under the same speed.

[0109] If the real-time comprehensive efficiency curve is obtained based on constant flow rate, the ideal comprehensive efficiency curve under the current corresponding working condition is the ideal comprehensive efficiency curve under the same flow rate.

[0110] The ideal comprehensive efficiency curve described above is obtained according to the reliability standard requirement of the measured electronic water pump, and is a standard curve.

[0111] The ideal comprehensive efficiency curve compared in the present application is measured based on a standard electronic water pump meeting the reliability requirement, and is a standard curve. The ideal comprehensive efficiency curve under different corresponding working conditions is different, and is used to compare the real-time comprehensive efficiency curve under different working conditions obtained in the test process. When comparison is performed, the ideal curve can be set in advance through the corresponding working condition, and comparison verification can be performed quickly when the real-time curve is obtained. Meanwhile, the difference between the ideal curve and the corresponding real-time curve under multiple different working conditions can be observed through multiple windows, and the difference between the real-time curves of the same electronic water pump under different working conditions can be observed. If the real-time curves meet the reliability requirement, it is proved that the reliability of the electronic water pump under multiple working conditions is satisfied, the stability of the overall reliability test of the electronic water pump is improved, and the reliability requirement in the actual use process is met.

[0112] The application sets the inlet voltage and inlet coolant temperature of the electronic water pump to be measured in advance, and then carries out constant speed or constant flow test on the electronic water pump to be measured, carries out variable flow test at constant speed or carries out variable speed test at constant flow, and collects the outlet-inlet pressure difference, current and flow data of the electronic water pump to be measured in real time under two different working conditions; then, a real-time comprehensive efficiency curve corresponding to the current working condition is calculated according to the above data, and the curve is compared with an ideal curve corresponding to the current working condition to verify whether there is a deviation within the allowable error range, and if not, it is considered that the reliability test requirement is met.

[0113] In subsequent tests, different inlet coolant temperatures can be reset, and the above test steps are continued, that is, the application can set multiple different working condition parameters to carry out variable speed or variable flow reliability test under different coolant temperatures, so as to enrich the reliability test of the electronic water pump under multiple working conditions and meet the reliability requirement in actual use.

[0114] In the embodiment, the values of the outlet-inlet pressure difference, current and flow collected in real time are monitored, and if the values are outside the corresponding normal range, it indicates that there is a safety hazard in the current test process, and warning should be given immediately to prompt the operator to stop the test, thereby improving the safety of the test.

[0115] As shown in Figures 2-4 The application also provides an automobile electronic water pump reliability test system for realizing the automobile electronic water pump reliability test method, and the test system comprises a driving device, a control system, a temperature control system and a water pump measurement system.

[0116] The water pump measurement system comprises a liquid storage tank, a measured electronic water pump and an electronic throttle valve, the liquid storage tank stores coolant, the outlet of the liquid storage tank is communicated with the inlet of the measured electronic water pump, the outlet of the measured electronic water pump is communicated with one end of the electronic throttle valve, the other end of the electronic throttle valve is communicated with the inlet of the liquid storage tank, a temperature measurement element and a first pressure measurement element are arranged between the liquid storage tank and the measured electronic water pump, a second pressure measurement element is arranged between the measured electronic water pump and the electronic throttle valve, and a flow measurement element is arranged between the electronic throttle valve and the liquid storage tank.

[0117] The control system is electrically connected with the measured electronic water pump, the electronic throttle valve, the temperature measurement element, the first pressure measurement element, the second pressure measurement element, the flow measurement element and the temperature control system.

[0118] The driving device provides voltage for the measured electronic water pump, so that the inlet voltage of the measured electronic water pump is kept as the design value.

[0119] The temperature control system is used for heating or cooling the cooling liquid in the liquid storage tank.

[0120] The control system is used for controlling the rotating speed of the measured electronic water pump, controlling the temperature control system to adjust the temperature of the cooling liquid in the liquid storage tank, and controlling the opening degree of the electronic throttle valve.

[0121] The control system directly collects the rotating speed, inlet voltage and current data of the measured electronic water pump, collects the flow data of the measured electronic water pump through the flow measuring element, collects the inlet and outlet pressure difference data of the measured electronic water pump through the first and second pressure measuring elements, and collects the cooling liquid temperature data at the inlet of the measured electronic water pump through the temperature measuring element.

[0122] The control system calculates the real-time comprehensive efficiency of the measured electronic water pump according to the inlet voltage, current, flow and inlet and outlet pressure difference of the measured electronic water pump, and compares a plurality of real-time comprehensive efficiency with the ideal comprehensive efficiency curve under the corresponding working condition to verify the reliability of the current measured electronic water pump.

[0123] The inlet voltage of the measured electronic water pump is first adjusted to the design value by the driving device to provide a stable voltage for the measured electronic water pump, and then the temperature of the cooling liquid at the inlet of the measured electronic water pump is adjusted by the temperature control system, the temperature control system adjusts the temperature of the cooling liquid according to the input instruction of the control system, and automatically maintains constant temperature after reaching the target temperature, and the adjusted cooling liquid flows into the measured electronic water pump through the liquid storage tank.

[0124] At this time, the control system keeps the rotating speed of the measured electronic water pump constant, and then controls the opening degree of the electronic throttle valve to change the flow of the cooling liquid at the inlet of the electronic water pump, when the flow changes, the load of the measured electronic water pump changes, since the voltage provided by the driving device is unchanged, the control system can measure the inlet and outlet pressure changes of the water pump in real time through the first and second pressure measuring elements, measure the flow changes of the water pump in real time through the flow measuring element, and directly collect the current changes of the water pump.

[0125] Or at this time, the control system keeps the opening degree of the electronic throttle valve unchanged, and then adjusts the rotating speed of the measured electronic water pump, when the rotating speed changes, the flow of the measured electronic water pump changes, since the voltage provided by the driving device is unchanged, the control system can measure the inlet and outlet pressure changes of the water pump in real time through the first and second pressure measuring elements, measure the flow changes of the water pump in real time through the flow measuring element, and directly collect the current changes of the water pump.

[0126] The last control system edits and inputs the above obtained working condition changes, the working condition includes: inlet voltage, inlet coolant temperature, throttle opening, water pump rotating speed, and real-time collection of water pump inlet voltage, water pump current, water pump inlet and outlet pressure difference, water pump flow and other test data during the test, and the test data is monitored and stored, and the real-time comprehensive efficiency of the electronic water pump under different working conditions is calculated according to the above test data, and the corresponding real-time comprehensive efficiency curve is drawn, and compared with the corresponding ideal comprehensive efficiency curve stored in the control system in advance, and finally the verification result can be output by the control system.

[0127] Through the above test system, the reliability of the electronic water pump under different working conditions can be effectively and stably tested, so as to verify the reliability of the electronic water pump under multiple variables, so that the reliability test of the electronic water pump is closer to the actual working condition, and the accuracy of the reliability verification of the electronic water pump is improved.

[0128] In the embodiment, the driving device is used for driving the electronic water pump, and provides voltage for the electronic water pump, and carries 2-50V voltage and 1-50A current.

[0129] In the embodiment, the control system is a central processing unit, including control, data acquisition and processing functions, and adjusts the rotating speed of the measured electronic water pump, controls the temperature control system to heat or cool, controls the opening of the electronic throttle valve, and records the rotating speed, inlet voltage, current, inflow coolant temperature, inlet and outlet pressure difference and flow of the measured electronic water pump in real time, and the acquisition frequency is greater than or equal to 1HZ, and an alarm is sent in time when the data is abnormal.

[0130] Referring to Figure 4 In the embodiment, the temperature control system includes a pneumatic device, a cooling device, a heating device and a transfer box.

[0131] The transfer box is communicated with the cooling device, the heating device and the liquid storage tank through pipelines, the pipeline between the cooling device and the transfer box is provided with a first normally closed valve, the pipeline between the heating device and the transfer box is provided with a second normally closed valve, and the pneumatic device pneumatically controls the two valves to realize opening and closing.

[0132] The principle of the temperature control system of the application for temperature control is as follows:

[0133] The control system collects the real-time temperature of the coolant at the inlet of the measured electronic water pump through a temperature measuring element;

[0134] When the temperature of the coolant is lower than the target temperature, the control system opens the second normally closed valve through the pneumatic device connected with compressed air, and the coolant flows between the transfer tank and the heating device, and the heating resistance wire in the heating device heats the coolant flowing into the pipeline of the heating device until the temperature measured by the temperature measuring element reaches the target temperature, and then the control system closes the second normally closed valve through the pneumatic device and stops the heating device, and the heating is completed.

[0135] When the temperature of the coolant is higher than the target temperature, the control system opens the first normally closed valve through the pneumatic device connected with compressed air, and the coolant flows between the transfer tank and the cooling device, and the circulating water in the cooling device cools the coolant flowing into the pipeline of the cooling device until the temperature measured by the temperature measuring element reaches the target temperature, and then the control system closes the first normally closed valve through the pneumatic device and stops the cooling device, and the cooling is completed.

[0136] The temperature control range of the temperature control system of the embodiment is: normal temperature-(130±2)℃, wherein the temperature control system controls the pneumatic device to make the coolant in the transfer tank flow to the heating or cooling device according to the temperature control requirement, realizes the heating or cooling of the coolant of the system, and automatically keeps the system constant temperature after reaching the target temperature±1℃.

[0137] In the embodiment, the liquid storage tank is a temperature-resistant and pressure-resistant sealed tank, and the volume of the tank is not less than 3 times the volume of the circulating coolant filled in the system, the pressure bearing capacity is ≥300kpa, and the outlet has a filter screen to prevent impurities in the coolant from entering the water pump.

[0138] Referring to Figure 3 In the embodiment, the system further comprises a liquid supplementing device, the liquid supplementing device comprises a liquid supplementing tank and a resistance element for heat dissipation, the resistance element is arranged between the electronic throttle valve and the liquid storage tank, and is provided with a gas overflow port, the liquid outlet at the bottom of the liquid supplementing tank is communicated with the top of the liquid storage tank, and the gas overflow port of the resistance element is communicated with the gas inlet at the top of the liquid supplementing tank through a gas pipe.

[0139] After the coolant flows out through the electronic throttle valve, it flows through the resistance element which simulates the function of the whole vehicle radiator, at this time, due to the heat dissipation effect, part of the coolant will be vaporized to form steam which is discharged to the liquid supplementing tank from the gas overflow port, and then the coolant flowing back into the liquid storage tank is reduced, and at this time, due to the gas filled in the liquid supplementing tank, the internal pressure of the liquid supplementing tank becomes larger, which will press the coolant in the liquid supplementing tank to flow into the liquid storage tank, so as to complete the supplement of the coolant. Through the above-mentioned circulation, the whole vehicle layout of the electronic water pump is simulated to the greatest extent, the pressure maintaining and pressure relief functions of the whole system are realized through the liquid supplementing device, and the stability of the coolant in the circulating loop is ensured.

[0140] In the embodiment, the test system further comprises a warning device electrically connected with the control system.

[0141] When any of the cooling liquid temperature at the inlet of the electronic water pump, the pressure difference between the inlet and outlet of the electronic water pump, the current and the flow rate exceeds the corresponding normal range, the control system gives a voice warning through the warning device to prompt the operator to stop the test due to the abnormality in the current test process.

[0142] In the embodiment, the electronic throttle valve is used to regulate the cooling liquid flow rate of the system, and the precision is ±0.5 L / min.

[0143] In the embodiment, the first pressure measuring element and the second pressure measuring element have the same structure, the measuring precision is ±0.15 kPa, and the pressure measuring range is 0-400 kPa.

[0144] In the embodiment, the measuring precision of the temperature measuring element is ±1.1 ℃, and the temperature measuring range is -40-1100 ℃.

[0145] In the embodiment, the flow rate measuring element has a range of 0-900 L / min, and the precision is ≤0.5% F·S.

[0146] In the embodiment, the liquid storage tank of the test system can be designed with multiple inlets and outlets, and the volume of the liquid storage tank can meet the requirements of simultaneously testing multiple electronic water pumps of the same type through multiple inlets and outlets, thereby effectively improving the test efficiency.

[0147] The application first adjusts the cooling liquid temperature at the inlet of the electronic water pump and the inlet voltage of the electronic water pump during the test process according to the test working condition requirements, so as to ensure the constant cooling liquid temperature and the constant voltage of the water pump before the test, thereby improving the stability during the reliability test; during the test, the rotation speed of the electronic water pump is set to perform the variable flow rate test, or the flow rate of the electronic water pump is set to perform the variable rotation speed test, the inlet and outlet pressure difference, the current and the flow rate data of the electronic water pump during the test process are collected in real time, and finally the real-time comprehensive efficiency curve is obtained according to the data; the real-time comprehensive efficiency curve is compared with the ideal comprehensive efficiency curve under the corresponding working condition, so that the reliability of the water pump can be quickly verified.

[0148] Compared with the traditional single constant temperature or constant flow rate or constant rotation speed reliability test, the test working condition of the application can also be designed for individual reliability test according to different types of electronic water pumps, and after adjusting the test working condition, the variable flow rate or variable rotation speed measurement is performed, which is closer to the actual working condition of the electronic water pump in the vehicle, and the electronic water pump can be effectively verified whether it meets the reliability design target.

[0149] The above embodiments are only the preferred embodiments of the present application for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art based on the present application are within the protection scope of the present application.

Claims

1. An automotive electric water pump reliability test system, characterized by, The test system comprises a driving device, a control system, a temperature control system and a water pump measurement system; The water pump measurement system comprises a liquid storage tank, a measured electronic water pump and an electronic throttle valve, the liquid storage tank stores cooling liquid, the outlet of the liquid storage tank is communicated with the inlet of the measured electronic water pump, the outlet of the measured electronic water pump is communicated with one end of the electronic throttle valve, the other end of the electronic throttle valve is communicated with the inlet of the liquid storage tank, a temperature measuring element and a first pressure measuring element are arranged between the liquid storage tank and the measured electronic water pump, a second pressure measuring element is arranged between the measured electronic water pump and the electronic throttle valve, and a flow measuring element is arranged between the electronic throttle valve and the liquid storage tank; The control system is electrically connected with the measured electronic water pump, the electronic throttle valve, the temperature measuring element, the first pressure measuring element, the second pressure measuring element, the flow measuring element and the temperature control system respectively; The driving device provides voltage for the measured electronic water pump, so that the inlet voltage of the measured electronic water pump is kept as a design value; The temperature control system is used for heating or cooling the cooling liquid in the liquid storage tank; The control system is used for controlling the rotating speed of the measured electronic water pump, controlling the temperature control system to adjust the temperature of the cooling liquid in the liquid storage tank, and controlling the opening degree of the electronic throttle valve; The control system directly collects the rotating speed, inlet voltage and current data of the measured electronic water pump, collects the flow data of the measured electronic water pump through the flow measuring element, collects the inlet and outlet pressure difference data of the measured electronic water pump through the first and second pressure measuring elements, and collects the cooling liquid temperature data at the inlet of the measured electronic water pump through the temperature measuring element; The control system calculates the real-time comprehensive efficiency of the measured electronic water pump according to the inlet voltage, current, flow and inlet and outlet pressure difference of the measured electronic water pump, draws a real-time comprehensive efficiency curve according to multiple real-time comprehensive efficiencies, and compares the real-time comprehensive efficiency curve with an ideal comprehensive efficiency curve under a corresponding working condition to verify the reliability of the measured electronic water pump; The test system is used for realizing a reliability test method of an automobile electronic water pump, The method comprises the following processes: adjusting the inlet voltage of the measured electronic water pump to a design value; adjusting the cooling liquid temperature at the inlet of the measured electronic water pump to a target temperature; keeping the rotating speed of the measured electronic water pump constant, changing the cooling liquid flow input into the inlet of the measured electronic water pump, collecting the inlet and outlet pressure difference, current and flow of the measured electronic water pump in real time, and calculating the real-time comprehensive efficiency of the measured electronic water pump under different flows when the rotating speed is constant; or keeping the cooling liquid flow input into the inlet of the measured electronic water pump constant, changing the rotating speed of the measured electronic water pump, collecting the inlet and outlet pressure difference, current and flow of the measured electronic water pump in real time, and calculating the real-time comprehensive efficiency of the measured electronic water pump under different rotating speeds when the flow is constant; drawing a real-time comprehensive efficiency curve according to the obtained multiple real-time comprehensive efficiencies; comparing the real-time comprehensive efficiency curve with an ideal comprehensive efficiency curve under a corresponding working condition to verify the reliability of the measured electronic water pump.

2. The reliability test system for an automotive electric water pump according to claim 1, wherein The temperature control system comprises a pneumatic device, a cooling device, a heating device and a transfer box; The transfer box is communicated with the cooling device, the heating device and the liquid storage tank through pipelines, the pipeline between the cooling device and the transfer box is provided with a first normally closed valve, the pipeline between the heating device and the transfer box is provided with a second normally closed valve, and the pneumatic device pneumatically controls the two valves to realize opening and closing.

3. The reliability test system for automotive electric water pump according to claim 1, wherein The liquid supplementing device comprises a liquid supplementing tank and a resistance element for heat dissipation, the resistance element is arranged between the electronic throttle valve and the liquid storage tank and is provided with a gas overflow port, a liquid outlet at the bottom of the liquid supplementing tank is communicated with the top of the liquid storage tank, and the gas overflow port of the resistance element is communicated with a gas inlet at the top of the liquid supplementing tank through a gas pipe.

4. The reliability test system for automotive electric water pump according to claim 1, wherein The warning device is electrically connected with the control system, and when any one of the cooling liquid temperature at the inlet of the measured electronic water pump, the pressure difference between the inlet and the outlet of the measured electronic water pump, the current and the flow rate exceeds the corresponding normal range, the control system gives a voice warning through the warning device to prompt the operator to stop the test because of the abnormality in the current test process.

5. The reliability test system for automotive electric water pump according to claim 1, wherein The ideal comprehensive efficiency curve corresponding to the current working condition refers to; If the real-time comprehensive efficiency curve is obtained based on constant rotation speed, the ideal comprehensive efficiency curve corresponding to the current working condition is an ideal comprehensive efficiency curve at the same rotation speed; If the real-time comprehensive efficiency curve is obtained based on constant flow rate, the ideal comprehensive efficiency curve corresponding to the current working condition is an ideal comprehensive efficiency curve at the same flow rate. The ideal comprehensive efficiency curve is obtained according to the reliability standard requirement of the measured electronic water pump and is a standard curve.

6. The reliability test system for an automotive electric water pump according to claim 1, wherein The formula for calculating the real-time comprehensive efficiency F is as follows: F = W1 / W2; In the formula, W1 is the effective power of the measured electronic water pump, and W2 is the consumed electric power of the measured electronic water pump. The calculation formula of W1 is as follows: W1= Q m × H × p × g; In the above formula, Q m is the flow rate of the electronic water pump being measured, p is the density of the coolant, H is the head of the electronic water pump being measured, and g is the acceleration due to gravity. The calculation formula of H is as follows: H = ΔP / ρg + ΔC / 2g + ΔZ; In the formula, ΔC is the flow rate difference between the inlet and the outlet of the measured electronic water pump, ΔZ is the height difference between the inlet and the outlet of the measured electronic water pump, and ΔP is the pressure difference between the inlet and the outlet of the measured electronic water pump. The calculation formula of ΔP is as follows: ΔP = P1-P2; In the formula, P1 is the outlet pressure of the measured electronic water pump, and P2 is the inlet pressure of the measured electronic water pump. The calculation formula of W2 is as follows: W2 = U×I; In the formula, U is the inlet voltage of the measured electronic water pump, and I is the current of the measured electronic water pump.

7. The reliability test system for automotive electric water pump according to claim 1, wherein The design value is a fixed value, which inputs a constant voltage value to the measured electronic water pump and provides a stable voltage for the measured electronic water pump.

8. The reliability test system for automotive electric water pump according to claim 1, wherein The specific process of regulating the cooling liquid temperature at the inlet of the measured electronic water pump to the target temperature is as follows: When the cooling liquid temperature at the inlet of the measured electronic water pump is lower than the target temperature, a heating device is connected in the circulating loop of the cooling liquid to heat the cooling liquid in the pipeline, so that the heated cooling liquid flows out to the measured electronic water pump, and when the cooling liquid temperature at the inlet of the measured electronic water pump reaches the target temperature, the heating device is turned off. When the temperature of the cooling liquid at the inlet of the electronic water pump under test is higher than the target temperature, the cooling device is connected in the circulating loop of the cooling liquid to cool the cooling liquid in the pipeline, so that the cooled cooling liquid flows out to the electronic water pump under test, until the temperature of the cooling liquid at the inlet of the electronic water pump under test reaches the target temperature, and the cooling device is closed; The cooling liquid temperature is controlled in real time by the heating device and the cooling device, so that the temperature of the cooling liquid flowing into the inlet of the electronic water pump under test is maintained within the target temperature range.

9. The reliability test system for an automotive electric water pump according to claim 1, wherein The values of the inlet and outlet pressure difference, current and flow rate collected in real time are monitored, and if the values exceed the corresponding normal range, an alarm is given to prompt the operator that there is an abnormality in the current test process, and the test should be stopped.

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