A steering-by-wire system of a wheel-driven electric vehicle, and a control method

A technology for electric vehicles and steer-by-wire, which is applied to electric steering mechanisms, power steering mechanisms, steering mechanisms, etc., and can solve problems such as poor dynamic response of steering wheels and mechanical coupling without independent steering functions
CN109094640AActive Publication Date: 2018-12-28XIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN UNIV OF TECH
Publication Date
2018-12-28

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Abstract

A steer-by-wire system of wheel-driven electric vehicle includes a steering wheel assembly connected in sequence, The invention also discloses a control method of a steering-by-wire system of a wheel-drive electric vehicle. Firstly, an ideal two-degree-of-freedom vehicle steering dynamic model is constructed, and the relationship between vehicle state parameter yaw angular velocity gain and lateral acceleration gain with the same angular transmission ratio is established. Then design reasonable constant yaw angle gain and constant lateral acceleration gain to determine the angular transmissionratio at different vehicle speeds; At last, the vehicle state parameters yaw angular velocity and mass center sideslip angle are designed as the feedback variables at the same time, The invention solves the problems in the prior art that the mechanical coupling between steering actuators in steering-by-wire does not have independent steering function, the dynamic response ability of steering wheels is slow, and the vehicle handling stability is poor under bad steering conditions.
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Description

technical field

[0001] The invention belongs to the technical field of new energy electric vehicle steering, and in particular relates to a steering-by-wire steering system for a wheel-drive electric vehicle. The invention also relates to a steering-by-wire control method for a wheel-drive electric vehicle. Background technique

[0002] Electric vehicles use electricity as the power source, and have the advantages of zero emission and high energy transfer efficiency. Their key technologies continue to break through and are challenging the market position of traditional internal combustion engine vehicles. Wheel drive and independent steer-by-wire have improved the space utilization efficiency and transmission efficiency of the vehicle chassis, providing a broader space for the development of electrification, intelligence, and lightweight vehicles.

[0003] Steering by wire cancels the complex mechanical structure of the traditional steering system, and all parts are connecte...

Claims

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