Engine and electronic water pump control method and system

Abstract

The invention discloses an engine and electronic water pump control method. The engine and electronic water pump control method comprises the steps of determining the current mode of an electronic water pump by detecting a water temperature sensor and the rotation speed of an engine after a whole vehicle is powered on, collecting the current vehicle speed of the whole vehicle, the current flow of the electronic water pump, the load of the engine and the rotation speed data of the engine in real time and obtaining heat evaluation parameters, obtaining the correction value for adjusting the electronic water pump under the normal work mode or the failure mode, obtaining the optimum adjusting time according to the change trend of the heat evaluation parameters, and performing optimum adjusting on the electronic water pump according to the correction value and the optimum adjusting time. The invention further provides a corresponding system. By the adoption of the electronic water pump control method and system, precise control over the electronic water pump can be achieved under various working conditions of the engine.

Description

technical field [0001] The invention relates to the technical field of automobile engine water pumps, in particular to an engine electronic water pump control method and system. Background technique [0002] At present, the water pumps used in the whole vehicle on the market mainly include mechanical water pumps, clutch water pumps and electronic water pumps. Among them, the electronic water pump is powered by the battery and does not require an accessory gear train. It can actively adjust the flow rate under any working condition of the engine to meet the different cooling needs of the engine under various working conditions. It is the most advanced cooling system in the field of cooling systems. Advanced pump types. [0003] In the prior art, there are the following two technical solutions for controlling the electronic water pump: [0004] The first type: working condition partition scheme. That is, through tests and other methods, the working conditions of the engin...

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Problems solved by technology

[0007] In the first technical solution, the electronic water pump actually only runs at 2 to 5 operating points according to the change of the engine’s operating conditions. When the engine’s operating conditions vary widely, only a few operating points can operate at the ideal flow rate Most of the working conditions have not been optimized, which wastes the ability of the electronic water pump to carry out stepless speed regulation.

[0008] In the second technical solution, because the purpose is to ensure the safe operation of the engine to the maximum extent, it is not possible to optimize each operating point of the engine well, and it requires multiple water temperature sensors, which is costly

[0009] Regardless of which of the above technical solutions, the electronic water pump can only be controlled based on the currently collected water temperature.

Due to the inertia of the electronic water pump in the process of changing the motor speed, there is a certain hysteresis in the feedback of the signal, and there is also a certain hysteresis from the change of the flow rate to the real feedback of the water temperature. The above methods often ignore this when adjusting the speed of the electronic water pump. Response, in some working conditions, the adjustment process may overshoot, resulting in large fluctuations in the water temperature all the time, and the situation cannot be stabilized

[0010] In addition, when the water temperature sensor fails, the above two technical solutions can only ensure the full power operation of the electronic water pump, and cannot judge the subsequent water temperature changes

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