Control method and system for dual-motor drive of electric vehicle

Abstract

The invention discloses a control method and system for electric automobile dual motor driving. An electric automobile comprises a first power motor, a second power motor, a driving wheel and a transmission device for transmitting power between the motor and the driving wheel. The transmission device limits a first gear with a first transmission ratio and a second gear with a second transmission ratio. Furthermore, the transmission device can shift between the first power motor at the second gear and a single motor driving position which is connected with the transmission device in operation, between the first power motor at the second gear, the second power motor at the first gear and a dual motor first gear driving position which is connected with the transmission device in operation at the same time, and between the first power motor at the second gear, the second power motor at the second gear and a dual motor second gear driving position which is connected with the transmission device in operation at the same time according to the method and system.

Description

technical field [0001] The present invention generally relates to a control method and system for a dual-motor drive of an electric vehicle, especially capable of optimizing torque distribution for different working conditions and having higher energy utilization efficiency. Background technique [0002] With the increasingly serious energy crisis and environmental problems, energy saving and emission reduction have become the development trend of the automobile industry. In the process of promoting new energy vehicles, electric vehicles have become the focus of the promotion of new energy vehicles due to their advantages of high efficiency and pollution-free. [0003] Unlike traditional fuel engines, electric motors have excellent torque characteristics, so the requirements for gearboxes in electric vehicles are greatly reduced. Traditional electric vehicles mostly use a single-motor single-speed ratio drive mode. Acceleration and climbing at low speeds of this traditiona...

AI Technical Summary

Problems solved by technology

Acceleration and climbing at low speeds of this traditional electric vehicle require the motor to output high torque at low speeds, while high-speed driving requires the motor to have a large speed range. At present, it is difficult to achieve both low and high speeds in motor design. High-efficiency operation, which leads to the fact that electric vehicles using this driving method often cannot meet the needs of low-speed driving and climbing and high-speed driving under the premise of meeting the highest energy utilization efficiency.

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