Rear Wheel Steering Alignment Correction
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Solution Overview
Problem
Conventional rear wheel steering systems lack a control technique to correct rear wheel alignment distortions or leaning, which impairs a vehicle's ability to drive straight and maintain stability.
Innovation Solution
A method and apparatus that utilize a controller to detect abnormalities in rear wheel alignment, determine a correction amount based on collected data, and adjust the rear wheel control position using an RWS actuator to maintain vehicle straightness and stability by outputting a control signal for the corrected position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rear wheel steering is applied to improve vehicle maneuverability and stability, then turning radius is decreased and driving stability is improved, but distortion or leaning occurs in rear wheel alignment due to abrasion of components
Solution Approach 1:
The controller continuously monitors rear wheel alignment status and dynamically adjusts the rear wheel steering angle based on detected alignment deviations. This closed-loop feedback mechanism compensates for alignment distortion caused by component abrasion, maintaining proper wheel alignment and driving stability over time without requiring frequent manual realignment.
Solution Approach 2:
The system changes the operating parameters of the rear wheel steering by adjusting the steering angle dynamically based on detected alignment conditions. When alignment distortion is detected, the controller modifies the rear wheel steering parameters to compensate for the distortion, effectively adapting the system to maintain optimal performance despite component wear.
2Ease of operation
If conventional rear wheel steering control is used, then the system is simple to operate, but the vehicle cannot drive straight when distortion or leaning occurs in rear wheel alignment
Solution Approach 1:
The rear wheel steering system performs self-correction by automatically detecting alignment distortion and adjusting its own steering angle to compensate. The controller monitors alignment status and autonomously modifies steering parameters without requiring driver intervention, enabling the vehicle to maintain straight trajectory even when alignment distortion occurs.
Solution Approach 2:
The controller dynamically changes the rear wheel steering angle parameter based on detected alignment conditions. When distortion or leaning is detected, the system adjusts the steering angle parameter to compensate for the misalignment, allowing the vehicle to continue driving straight without manual intervention while maintaining simple operation.
3Device complexity
If the rear wheel alignment distortion is not corrected, then the system structure remains simple, but the vehicle's ability to drive straight and maintain stability is impaired
Solution Approach 1:
The existing rear wheel steering actuator and controller are made multi-functional by adding alignment correction capability to the standard steering function. The same actuator that steers the rear wheels for maneuverability now also performs alignment compensation, eliminating the need for separate correction mechanisms and maintaining simple system structure while improving straightness maintenance.
Solution Approach 2:
The controller incorporates alignment status monitoring and uses this feedback to dynamically adjust rear wheel steering angle. This feedback mechanism enables the system to detect and compensate for alignment distortion using existing components, improving vehicle straightness without significantly increasing device complexity.
Data Source
AI summary
An apparatus and a method for controlling a rear wheel steering (RWS) system, may include determining, by a controller, whether an abnormality occurs in a rear wheel alignment based on information collected from the vehicle; determining, by the controller, a correction amount of the rear wheel alignment for correcting the abnormality occurring in the rear wheel alignment using predetermined data based on one or more of the information collected from the vehicle when the abnormality is determined to occur in the rear wheel alignment; correcting, by the controller, a rear wheel control position determined based on variable information related to an RWS control using the determined correction amount of the rear wheel alignment; and controlling, by the controller, an RWS actuator of the vehicle based on the corrected rear wheel control position, and an apparatus for controlling an RWS system.