A method and device for controlling the speed of a cooling fan, and a vehicle

Abstract

The invention relates to a method and device for controlling the rotational speed of a cooling fan, and a vehicle. By obtaining the temperature and temperature change information of the cooling medium, when the temperature of the cooling medium is lower than the target temperature setting value, if it is in the rising state, the fan speed is controlled to decrease at a speed change rate that is less than or equal to the small speed reduction threshold value of the change rate threshold , if it is in the falling state, control the fan speed to decrease at a speed change rate greater than or equal to the threshold of the greatly reduced speed change rate; when the cooling medium temperature is greater than the target temperature setting value, if it is in the rising state, control the fan speed If the speed change rate is greater than or equal to the threshold value of the speed increase change rate, if it is in a declining state, the fan speed is controlled to increase at a speed change rate that is less than or equal to the speed small increase change rate threshold value. For different states of the control fan The rotation speed realizes the precise and rapid approach of the cooling medium to the target temperature, which improves the speed regulation effect and efficiency.

Description

technical field [0001] The invention relates to the technical field of thermal management, in particular to a method and device for controlling the rotational speed of a cooling fan, and a vehicle. Background technique [0002] The main function of the fan in the vehicle cooling system is to force the external air to flow through the heat exchanger core and perform forced heat exchange, so that the waste heat of the engine, air conditioner and other systems can be dissipated to the external environment in time. Traditional vehicle cooling fans are generally directly driven by the engine, and the fan speed is coupled with the engine speed, so it cannot actively adjust the speed according to the actual heat dissipation demand, but can only change the operating speed according to the vehicle load status, which will inevitably lead to excess cooling capacity, and Increased cooling system energy consumption. Therefore, how to realize that the fan can actively adjust the operatin...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a speed control method, device and vehicle of a cooling fan to solve the problem of poor speed regulation effect and low efficiency caused by inaccurate speed control of the existing cooling fan

[0006] In order to achieve precise speed regulation of the cooling fan, solve the problem of poor speed regulation effect and low efficiency caused by inaccurate speed control of the existing cooling fan

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