Method and device for controlling electronic water pump of water-cooling system of automobile engine

Abstract

The invention provides a method and device for controlling an electronic water pump of a water-cooling system of an automobile engine. The method comprises the following steps: step S1, judging whether the engine is in a cold start state or not according to actually measured water temperature at a water outlet of the engine and the state of the engine, if the engine is in the cold start state, carrying out step S2, and if the engine is not in the cold start state, carrying out step S3; step S2, setting running time and stopping time of the electronic water pump according to the thermal load and the actually measured water temperature of the engine and duty ratio of the electronic water pump in a running process, and controlling the electronic water pump to carry out intermittent motion; step S3, setting a basic duty ratio of the electronic water pump according to a running region of the engine and difference between target water temperature and the actually measured water temperature; and step S4, carrying out PID closed-cycle correction on the basic duty ratio of the electronic water pump according to the difference between the target water temperature and the actually measured water temperature and actual pump speed of the electronic water pump to obtain total duty ratio output to the electronic water pump, and controlling the electronic water pump according to the total duty ratio. By the method and device for controlling the electronic water pump of the water-cooling system of the automobile engine, warming time can be shortened, and the water temperature control effect is improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method and device for controlling an electronic water pump of an automobile engine water cooling system. Background technique [0002] At present, there are mainly three types of water pumps in the water cooling system of automobile engines: mechanical water pumps, clutch water pumps and electronic water pumps. The mechanical water pump is connected to the engine through a belt. The pump speed is limited by the engine speed and cannot be automatically adjusted according to the heat load difference of the engine under different working conditions. The power consumption is large and the water temperature control effect is poor. The clutch water pump and the engine are connected and disconnected through the clutch. The working principle of the clutch water pump is the same as that of the mechanical water pump. Compared with the mechanical water pump, it can reduce the energy c...

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Problems solved by technology

The target water temperature is set by the fuel consumption and maximum performance of the engine. In most working conditions, the target water temperature is higher than the water temperature when the thermostat is fully open. If the difference is too large, the

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