Control method and system for engine electronic water pump

Abstract

The invention provides a control method for an engine electronic water pump. The method comprises the steps of obtaining the target temperature of an engine water outlet and the basic pump speed of the electronic water pump; on the basis of the target temperature of the engine water outlet and the actually-measured temperature of the engine water outlet, obtaining a PID control correction coefficient; obtaining an environment temperature correction coefficient, and on the basis of the basic pump speed of the electronic water pump, the PID control correction coefficient and the environment temperature correction coefficient, obtaining the target rotating speed of the electronic water pump; utilizing the target rotating speed of the electronic water pump for controlling the engine electronicwater pump. The invention further provides a control system for the engine electronic water pump. Control over the target rotating speed of the electronic water pump is performed in two steps, the target rotating speed and the basic pump speed of an electronic fan are output in the first step, pre-control is achieved, and the system responsiveness is improved. In the second step, the basic pump speed is corrected jointly by a PID and the environment temperature, and the control precision is improved.

Description

technical field [0001] The invention relates to the technical field of engine cooling systems, in particular to a control method and system for an engine electronic water pump. Background technique [0002] The engine is a device that converts chemical energy into mechanical energy through combustion. A large amount of heat energy is generated in the process, and the engine itself must maintain a normal operating temperature, so it needs to be equipped with a suitable cooling system. At present, most models of engines use mechanical water pumps. Mechanical water pumps The pump speed corresponds to the engine speed at a certain ratio, that is, the cooling water flow is only controlled by the engine speed, and cannot adapt to all working conditions, such as slow climbing, low engine speed, low cooling water flow, but high heat load, which cannot meet the actual heat dissipation of the engine demand, the engine temperature rises and the operating efficiency decreases. [0003]...

AI Technical Summary

Problems solved by technology

However, at present, the electronic water pump of some products is only used as an additional independent cooling system, and has not completely replaced the mechanical water pump; the control of the electronic water pump of some products depends entirely on PID adjustment, and the control stability is relatively poor; the target water temperature of the engine outlet for all working conditions of some products is The same value, the performance of the engine is poor

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