System and method for controlling cooling fan of air-cooling motor controller

Abstract

The invention discloses a system and method for controlling a cooling fan of an air-cooling motor controller. The system comprises an input signal collecting and processing module, a fan duty ratio calculating module and a fan drive module, all of which are connected in sequence, wherein the input signal collecting and processing module is used for collecting running parameters of the motor controller and a motor in an electric drive system; the fan duty ratio calculating module is used for obtaining the fan running duty ratio through calculation according to an output signal of the input signal collecting and processing module and the switch frequency of a power module; and the fan drive module is used for outputting drive current to drive the fan to run according to the fan duty ratio output by the fan duty ratio calculating module. By taking the direct-current bus voltage, the temperature of the power module, the temperature of the motor controller, the actual execution torque of the motor, the rotation speed of the motor (or the vehicle speed) and the switch frequency of the power module into overall consideration, the cooling fan is controlled at the degree of 0-100 percent under the condition of meeting different threshold values.

Description

Technical field [0001] The invention relates to the technical field of electric vehicle electric drive system control, in particular to an air-cooled motor controller cooling fan control system and method. Background technique [0002] As an important part of electric vehicles, the electric drive system is the key to realize the mutual conversion of mechanical energy and electric energy. The electric drive system mainly includes a motor controller and a motor body. The power module in the motor controller is expensive and highly sensitive to temperature. In recent years, with the rapid development of electric vehicles and consumers' requirements for the power of electric vehicles, high-power density electric drive systems have been widely used. The increase in power density puts forward higher requirements for the heat dissipation conditions of the electric drive system, and the heat dissipation conditions have become an important bottleneck for the performance improvement of th...

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Problems solved by technology

[0005] In addition, although the cooling fan in the patent CN205768624 is not the same component as the cooling fan targeted by this patent, its control method still has certain comparative value

Comparing the control method in the patent, it can be found that it only controls the duty cycle of the fan according to the temperature of the motor controller and the temperature of the motor, which is far from enough

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