Method and system for controlling an electronic water pump of an engine

Abstract

The invention provides a control method of an engine electronic water pump, the method comprising: obtaining a target temperature of an engine water outlet and a basic pump speed of an electronic water pump; obtaining a PID control correction coefficient based on the target temperature of the engine water outlet and the measured temperature of the engine water outlet; The ambient temperature correction coefficient is obtained, and based on the basic pump speed of the electronic water pump, the PID control correction coefficient and the ambient temperature correction coefficient, the target speed of the electronic water pump is obtained; the target speed of the electronic water pump is used to control the engine electronic water pump. The invention also provides a control system for the electronic water pump of the engine. The invention controls the target rotational speed of the electronic water pump in two steps. The first step outputs the target rotational speed of the electronic fan and the basic pump speed to realize pre-control and improve the system responsiveness. In the second step, the PID and the ambient temperature jointly control the basic pump speed. Make corrections to improve control accuracy.

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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