Steering Rack Stroke Control to Prevent Rack Stopper Jamming
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Solution Overview
Problem
Four-wheel steering systems face issues with the end of the rack and stopper becoming stuck due to excessive steering angle information generated by the driver, leading to mechanical coupling overload and failure to return to the original position.
Innovation Solution
A steering control system that includes an actuator, position sensor, and a control device capable of calculating a target rack stroke based on vehicle speed, steering angle, and rotation speed, with an area entry determination unit to detect when the rack approaches a jamming condition and reduce the target driving speed or output current to prevent sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driver generates excessive steering angle information, then the steering response is enhanced, but the rack and stopper become stuck due to mechanical coupling overload
Solution Approach 1:
The control device performs preliminary detection of rack position and calculates target rack stroke before actuator operation. By determining whether the rack is in the anti-jam control area in advance, the system prevents excessive steering input from causing mechanical overload and sticking between the rack and stopper.
Solution Approach 2:
The position sensor provides real-time feedback on rack position to the control device. The control device continuously monitors the rack stroke and compares it against predefined anti-jam control area thresholds, adjusting actuator output current and driving speed dynamically to prevent mechanical coupling overload.
2Length of moving object
If the rack stroke is increased to accommodate large steering angles, then the steering range is expanded, but the mechanical coupling exceeds its limit and causes sticking
Solution Approach 1:
The control device dynamically adjusts the target driving speed and target output current of the actuator based on real-time rack position feedback. When the rack approaches the anti-jam control area boundaries, the system automatically reduces actuator force and speed, preventing mechanical coupling overload while allowing full steering range operation.
Solution Approach 2:
The system changes operational parameters (actuator output current, driving speed) based on rack position parameters. By monitoring rack stroke and comparing it against predefined thresholds for the anti-jam control area, the system adjusts parameters to keep the mechanical coupling within safe operating limits while maintaining steering functionality.
Data Source
AI summary
The present disclosure relates to a steering control system, a steering control device, and a steering control method. More specifically, a steering control system according to the present disclosure comprises: an actuator driven at a target driving speed and with a target output current on the basis of an input control signal; a rack bar axially moving by the drive of the actuator; a location sensor for detecting the location of a rack included in the rack bar; and a steering control device for calculating a target rack stroke of the rack on the basis of at least one of a driving speed of a vehicle, a steering angle of a steering wheel and a rotation speed of the steering wheel, and generating a control signal such that the rack moves by the target rack stroke to control the drive of the actuator.