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A fuzzy control-based steering-by-wire system and its control method

A technology of steer-by-wire and fuzzy control, which is applied to the steering mechanism, steering rod, electric steering mechanism, etc., and can solve the problem of frequent changes in the speed of the power assist motor A, the stability of the steering system affecting the safety and handling stability of the vehicle, and compound steering. System instability and other problems, to achieve the effect of broad market application prospects

Active Publication Date: 2018-08-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the ECU judges the steering mode required by the compound steering system and switches the steering mode, the calculation result of the ECU may "jump" near the mode switching threshold, resulting in frequent changes in the speed of the power assist motor A controlling the electric power assist module, resulting in compound steering. The system works unstable, and the working stability of the steering system directly affects the safety and handling stability of the vehicle

Method used

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  • A fuzzy control-based steering-by-wire system and its control method
  • A fuzzy control-based steering-by-wire system and its control method
  • A fuzzy control-based steering-by-wire system and its control method

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Embodiment Construction

[0021] The present invention will be further explained below in conjunction with the drawings.

[0022] The difference between the structure adopted in this article and the existing structure lies in the different power assist mode. The existing steer-by-wire technology uses electric power assist, which is currently only applied to small cars, but if it is to be used in large cars, it will be used in the start. Under working conditions, there will be insufficient assistance. The present invention solves the above-mentioned problems by adopting compound assist.

[0023] Reference figure 1 , figure 2 As shown, a composite wire-controlled steering system of the present invention includes: steering wheel 1, steering column 2, torque sensor 3, rotation angle sensor 4, electronic control unit 5, feedback motor deceleration mechanism 6, feedback motor C 7, loop Ball steering gear / hydraulic booster cylinder 8, steering rocker arm 9, electric steering module, electronically controlled hy...

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Abstract

The invention discloses a composite steering-by-wire system based on fuzzy control and a mode switching control method thereof. An execution mechanism of the system comprises two parts of an electrical steering module and an electrical control hydraulic steering module. According to the system, corresponding mode switching control coefficients can be obtained by combining SOC (State of Charge) parameters of a battery according to input quantities of a steering angle of a steering wheel, a vehicle speed and the like and the fuzzy logic; switching is carried out among an electrical steering mode, an electrical control hydraulic steering mode and a composite steering mode so as to implement steering; perfect fusion of steering portability and steering road feeling of a vehicle is achieved; moreover, economy and flexibility of automobile steering-by-wire can be combined; the composite steering-by-wire system based on fuzzy control and the mode switching control method thereof have wide market application prospect.

Description

Technical field [0001] The invention relates to the field of wire-controlled steering, in particular to a wire-controlled steering system based on fuzzy control and a control method thereof. Background technique [0002] The current wire-controlled steering system generally adopts the method of adding two motors to the output end of the steering wheel mechanism and the input end of the steering gear mechanism to simulate the road feel caused by the feedback of the road surface and mechanical structure during driving. Change and apply corresponding execution torque to the steering mechanism according to the driver's intention, and the electronic control unit controls the execution motor and the feedback motor in real time according to the changes in the working conditions of the vehicle. Limited by the electrical characteristics of the vehicle battery voltage and other electrical characteristics, the maximum execution torque output by the execution motor is small, which cannot mee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62D5/04B62D5/06B62D6/00B62D101/00B62D117/00B62D119/00B62D137/00
CPCB62D5/0409B62D5/0463B62D5/064B62D6/00
Inventor 栾众楷赵万忠陈亮宇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS