A method for differential speed control of wheel-side motors

Abstract

The invention discloses a method for controlling the differential speed of a wheel-side motor. The method comprises the following steps: two torque sensors are installed on the drive shafts of the left and right wheel-side motors, and the signals are transmitted to a differential speed controller in time; the wheel-side motors are controlled by the motors The motor controller communicates with the differential speed controller through CAN communication, and the left and right wheel side motor torque commands received by the motor controller are sent by the differential speed controller, and the motor controller sends the speed of the left and right wheel side motors to the differential speed controller The differential controller communicates with the vehicle controller through CAN communication, and the differential controller receives the total torque command from the vehicle controller, and recalculates the torque and sends it to the left and right motor controllers to control the motor rotation torque respectively. The invention realizes the torque control of the wheel side motor through the cooperation among the torque sensor, the motor controller, the differential speed controller and the whole vehicle controller, avoids the phenomenon of tire eating for a long time, and improves the service life of the tire.

Description

technical field [0001] The invention relates to the technical field of pure electric passenger cars, in particular to a method for differential speed control of wheel side motors. Background technique [0002] In February 2017, the National Development and Reform Commission, together with the Ministry of Science and Technology, the Ministry of Industry and Information Technology, and the Ministry of Finance, organized the compilation and release of the "Guiding Catalog of Key Products and Services for Strategic Emerging Industries (2016 Edition)" (abbreviation: "Catalogue"). Among them, among the products that involve the key cultivation of new energy vehicles, wheel motors are impressively listed. [0003] In recent years, the wheel-side motor drive technology has been generally favored by the industry. Many bus companies have accumulated strength and developed a variety of wheel-side motor drive products. It is understood that with the increasing demand for lightweight el...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the phenomenon that the wheel motor does not have a differential, and the car will eat tires when turning, the present invention provides a method for controlling the differential speed of the wheel motor, because when the vehicle is turning, the speeds of the wheels on both sides are different. However, if the same torque is allocated to both motors, the internal tires will be subjected to too much resistance, which will cause the phenomenon of tire eating for a long time, resulting in the tires not being able to be used for a long time and greatly shortening the life of the tires.

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