An optimal control method for electric vehicle dual-motor efficiency

Abstract

The invention discloses an optimal control method for the efficiency of two electric motors of an electric vehicle. The optimal efficiency ratio MAP is established through the optimal control algorithm, and the optimal efficiency ratio is obtained by off-line calculation based on the efficiency MAP of the two driving motors and the external characteristic curve. ratio MAP; the X-axis of the optimal efficiency ratio MAP is the target total demand torque of the whole vehicle, the Y-axis of the optimal efficiency ratio MAP is the vehicle speed, and the Z-axis of the optimal efficiency ratio MAP is the torque distribution percentage. The distribution of the output target torque of the drive motor maximizes the driving efficiency of the parallel dual-motor electric vehicle. The invention obtains the optimal ratio MAP of the dual motors through offline calculation of the optimal control algorithm for the efficiency of the dual motors, and can greatly optimize the comprehensive driving of the vehicle during the driving process of the vehicle and the braking feedback process without increasing the calculation amount of the controller. efficiency. Compared with the fixed proportional torque distribution, the control of the present invention has a significant efficiency improvement effect.

Description

technical field [0001] The invention belongs to the field of electric vehicle whole vehicle drive system design, and in particular relates to an optimal control method for multi-motor efficiency of an electric vehicle. Background technique [0002] With the continuous precipitation of technology in the electric vehicle industry, domestic auto manufacturers are also constantly transplanting the technology from traditional vehicles to electric vehicles. Electric vehicle technology is becoming more and more mature, and its power system architecture is constantly innovating. The four-drive system of electric vehicles is one of them. an important branch. Electric vehicles can be driven by using multiple electric motors, which can break through the front and rear wheel power mechanical transmissions used in traditional fuel vehicles and reduce the complexity of the system. At present, the mainstream four-drive system of electric vehicles is a dual-motor drive system, which has th...

AI Technical Summary

Problems solved by technology

Since the two motors are different, the execution efficiency of the two motors is also different when the system is working. If the torque distribution of the vehicle is unreasonable or not fine enough, there will be a situation of low system operation efficiency, which will reduce the mileage of the electric vehicle.

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