Control method and device for cooling water pump and vehicle

Abstract

The invention discloses a control method and device for a cooling water pump and a vehicle. The control method comprises the following steps that the driving motor temperature, the motor controller temperature and the temperature of cooling liquid at a water inflow opening of a driving motor are collected; according to the maximum value among the driving motor temperature, the motor controller temperature and the cooling liquid temperature and the target temperature, the temperature difference and the temperature difference change rate between the maximum value and the target temperature are obtained; and according to the preset fuzzy control rule as well as the temperature difference and the temperature difference change rate between the maximum value and the target temperature, the rotary speed of the cooling water pump is controlled. According to the control method, the rotary speed of the cooling water pump can be adjusted in real time to achieve the purpose of energy conservation, energy resources are saved, the endurance mileage of the vehicle is ensured, the control accuracy can be improved, and the reliability of the vehicle is improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a cooling water pump control method, device and vehicle. Background technique [0002] At present, the cooling system of the automobile is used to cool down the driving motor and the motor controller of the electric vehicle, wherein the water flow rate of the cooling water in the cooling system can be adjusted by the duty ratio of the cooling water pump. [0003] However, the control system of the cooling water pump mostly adopts single-point temperature acquisition. For example, only one temperature sensor is set in the motor controller, so that the vehicle controller can read the single-point water temperature sensor signal, and make a logical judgment on this signal to output The control signal achieves the purpose of adjusting the duty ratio or switch of the cooling water pump, which reduces the accuracy of the control and reduces the reliability of the vehicle. [0004]...

AI Technical Summary

Problems solved by technology

[0003] However, the control system of the cooling water pump mostly adopts single-point temperature acquisition. For example, only one temperature sensor is set in the motor controller, so that the vehicle controller can read the single-point water temperature sensor signal, and make a logical judgment on this signal to output The control signal achieves the purpose of adjusting the duty ratio or switch of the cooling water pump, which reduces the accuracy of the control and reduces the reliability of the vehicle

[0004] In addition, the water pump usually adopts the control mode of always opening after high pressure, and it is controlled by constant speed, so that the water flow of cooling water is fixed. Although the implementation is simple, the power consumption is large, and it cannot be controlled according to the temperature and temperature rise of the motor system. Speed ​​adjustment of cooling water flow, waste of energy, reduce the cruising range of the vehicle, and fail to meet energy-saving requirements

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