A comprehensive cooling control method for a new energy vehicle drive motor

Abstract

The present invention is a comprehensive cooling control method for the driving motor of a new energy vehicle. In the control method, the ambient temperature T, which has a significant influence on the cooling of the driving motor M, is first amb and vehicle speed V host The two parameters are introduced into the control of the water-cooling system, combined with a specific algorithm to obtain the target heat dissipation Q that requires the auxiliary heat dissipation of the water-cooling system aim , and further obtain the target inlet water temperature T for cooling the drive motor M aim ; Then based on the temperature, the speed requirements of the water pump P and fan F are calculated, and the control duty ratio of the water pump P and fan F is obtained by integrating the operation control logic; finally, the PWM signal is output through the hard line of the controller to realize the control of the water pump P And fan F start and stop, speed control. The control method takes the ambient temperature T amb and vehicle speed V host The two parameters are introduced into the control of the water-cooling system, and the heat dissipation demand of the drive motor M is considered and calculated more comprehensively and carefully. Based on this demand, the work of the water pump P and the fan F can be more accurately controlled, and the energy consumption for heat dissipation can be effectively reduced. consumption.

Description

technical field [0001] The invention relates to the field of thermal management of new energy vehicles, in particular to a cooling control technology for a drive motor of a new energy vehicle. Background technique [0002] The drive motor is an important power component of the new energy vehicle. The cooling control of the drive motor can directly affect the output power, use efficiency, service life and other key indicators of the drive motor. In turn, it is reflected in the pure electric cruising range, the comprehensive fuel consumption of hybrid models, and the user's driving experience. [0003] At present, most of the cooling of the drive motor is used in the automotive industry. figure 1 The drive motor water cooling system scheme shown, or a derivative scheme based on this scheme. The water cooling system is composed of a water pump P, a water temperature sensor S, a supplementary kettle K, a heat dissipation assembly composed of a radiator and a fan F, a coolant p...

AI Technical Summary

Problems solved by technology

The main reason is that the influence of the ambient temperature and the real-time heat generation of the driving motor on the cooling of the driving motor is not considered

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