The electronic water pump adjusts the circulating coolant flow according to the vehicle's working conditions and realizes the temperature regulation of the automobile motor. It is an important part of the cooling system of the new energy vehicle. Performance testing is an indispensable part of the research and development and production of the water pump. At present, the automotive electronic water pump test Technology research and equipment development have not kept up with the development of electronic water pumps, and the research on testing techniques is mainly focused on traditional water pumps. NF’s small water pump test system can measure performance parameters such as pump flow, lift, and shaft efficiency at room temperature, and realize test data. The fast collection of water pump air tightness. The designed convenient water pump air tightness test bench adopts differential pressure to detect water pump air tightness. The water pump general test system is designed by using embedded and analog circuits.
According to the industry standard QC/T288.2-2001 and JB/T8126.9-2017 and related policy requirements, the cooling water pump type inspection mainly includes performance test, cavitation test, etc. Through testing the flow rate, voltage, and Current, inlet and outlet pressure, calculation of head, power, efficiency, NPSH and other performance parameters, complete the flow-head, flow-power, flow-efficiency, flow-NPSH performance curve drawing of electronic water pumps.
Different from the mechanical cooling water pump, the speed of the electronic water pump is controlled by its own integrated system, and the given voltage and control signal can make the internal DC brushless motor work at the corresponding speed. The traditional method of testing the motor torque and speed to calculate the input power of the water pump is not suitable for electronic For the test of the water pump, it is equipped with a programmable power supply to read back the voltage when the water pump is running, calculate the input power of the motor through the current and voltage, and then multiply it by the efficiency coefficient to be the input power of the electronic water pump.
Main technical parameters of the test system: flow measurement range 0~500L/min, measurement accuracy ±0.2%FS; inlet and outlet pressure measurement range -100~200kPa, test accuracy ±0.1%FS; current measurement range 0~30A, measurement accuracy ±0.1 %FS; programmable power supply voltage supply range 0~24V, readback accuracy ±0.1%FS, power range 0~200W; temperature measurement range -20~100℃, measurement accuracy ±0.2%FS, temperature control range 0~80℃ , control accuracy ±2°C.
General performance test plan
According to the relevant industry test standards, the general performance test of water pumps requires that within the range of 40%~120% of the rated speed of the pump, no less than 8 flow operating points should be uniformly set according to the maximum and minimum flow rates passing through the test pipeline. Through PID control, Adjust the opening of the outlet proportional valve to stabilize the flow at the flow point. The sensor monitors the inlet and outlet pressure, temperature, flow rate of the electronic water pump test pipeline in real time, and the working voltage and current parameter values of the electronic water pump. When the flowmeter monitors that the flow in the pipeline is stable After a period of time, record the parameter values of the electronic water pump. Knowing the pipe diameter, the height difference between the inlet and outlet, the liquid density parameters and the acceleration of gravity, calculate the flow-head, flow-power, and flow-efficiency curves of the electronic water pump at the rated speed ｡
Post time: Mar-15-2023
