A four-wheel steering method for four-wheel independent drive electric vehicles

Abstract

The invention discloses a new four-wheel steering mode for four-wheel independently driven electric vehicles; the steering mode combines the traditional front-wheel steering system and the rear-wheel differential steering system. The differential steering method of the rear wheels is to control the driving force of the driving motors of the left and right wheels to produce a difference in driving force, thereby driving the wheels to rotate around their kingpins to generate the steering angle of the rear wheels, so as to reflect the advantages of four-wheel steering. The four-wheel steering system can greatly improve the steering stability of the vehicle during high-speed steering and the maneuverability of low-speed steering. The complex steering mechanism can be eliminated by adopting the rear wheel steering, the structure is simple, and the space utilization of the vehicle is improved. For the extreme working condition, since the righting moment of the wheel is very small, a very small driving torque difference may produce a very large steering angle. A clutch device is installed at the steering tie rod of the rear wheel, which can automatically adjust the joint pressure to generate friction torque to overcome the excessive driving torque difference, so as to obtain the desired steering angle of the rear wheel.

Description

Technical field [0001] The present invention belongs to the steering control, and in particular relates to a four-wheel independent steering driving method of an electric vehicle. Background technique [0002] Continuous development of modern transportation system as well as the growing popularity of the car, on the one hand to bring the convenience of travel and promoting the development of automobile technology; it also led to the accident-prone, threatening people's lives and property. Improve active safety performance of vehicles can effectively reduce the incidence of traffic accidents. Therefore, the car's active safety performance as well as researchers increasingly major car manufacturers attention. People have become increasingly demanding active safety performance, the traditional front wheel steering can not meet the requirements. The four-wheel steering is an effective way to achieve active safety vehicles, has profound practical significance in-depth study. [0003] ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in view of the current situation that the above-mentioned traditional front-wheel steering vehicles can no longer meet the requirements of active safety performance and the feasibility of applying differential steering to four-wheel independent drive electric vehicles, a new The steering method used for four-wheel independent drive electric vehicles, combined with traditional front-wheel and rear-wheel differential steering; its purpose is to improve the vehicle's low-speed steering maneuverability and high-speed operation stability

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