What is the function of electric water pump for new energy vehicles?

Pacific automobile network water pump is mainly used in main cooling system of internal combustion engine, cooling circuit of turbocharger, intercooling system of intake air, driving system of new energy vehicle and thermal management system of power battery. The water pump in electric vehicle is generally an electronic water pump (also called "electric water pump"), which is mainly used to drive the motor, electrical components and power battery to cool circularly.

First, the application field of electronic water pump Most fuel trucks use mechanical water pumps, and some fuel trucks use electronic water pumps because of their high technical content. At present, most mechanical water pumps still use traditional centrifugal pumps. The crankshaft of the engine drives the impeller to rotate through the transmission belt, and the cooling liquid is thrown to the pump shell under the action of centrifugal force, forming a pressure difference between the impeller center and the water inlet of the pump, thus pumping the cooling water in the radiator into the impeller center. The electronic water pump is driven by a motor. Generally, DC brushless motor is adopted, and the pump shaft and motor shaft are designed as a whole. The motor speed is controlled by the embedded temperature control module, so as to adjust the circulation speed of coolant.

The characteristics of electronic water pump, such as energy saving, emission reduction, high efficiency, environmental protection and intelligent refrigeration, determine that it is the general trend to replace mechanical water pump. "Precise cooling" is to achieve the best temperature distribution with the least coolant flow. The key to the design of accurate cooling system is to select a matching cooling water pump to ensure that the cooling capacity of the system can meet the needs of working temperature in key areas when the engine is under low speed and heavy load. The engine equipped with electric water pump cooling system can reduce the coolant flow by 40% in the whole working speed range. Under the same configuration and cooling requirements, the energy consumption of electric DC brushless water pump is only 16% of that of mechanical water pump.

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)