Active Rear Wheel Steering Control for Automatic Parking Accuracy
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Solution Overview
Problem
The existing four-wheel steering systems, including rear wheel steering, face challenges in controlling vehicle behavior during automatic parking, leading to errors due to changes in vehicle movement traces, which are not accounted for in front wheel steering-based systems, necessitating improved control methods to enhance mobility and stability.
Innovation Solution
A method for controlling an active rear wheel steering apparatus involves determining its operation state and vehicle running mode, stopping or switching the rear wheel steering when abnormal or in automatic parking mode, and switching to a default or assistance state based on mode conditions to prevent errors and improve vehicle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rear wheel steering is activated to improve vehicle mobility and stability, then vehicle maneuverability is improved, but automatic parking system accuracy deteriorates due to unaccounted movement trace changes
Solution Approach 1:
The system dynamically adjusts rear wheel steering operation based on detected running modes. When automatic parking mode is detected, the control unit stops rear wheel steering operation to maintain prediction accuracy. In other modes, rear wheel steering operates normally to provide enhanced maneuverability. This dynamic switching resolves the contradiction by adapting system behavior to operational context.
Solution Approach 2:
The control unit changes the operational parameter of rear wheel steering from active to inactive state based on the detected running mode. This parameter change allows the system to maintain high parking accuracy when needed while preserving maneuverability benefits during normal operation, effectively resolving the accuracy-maneuverability trade-off.
2Reliability
If rear wheel steering operation is stopped during automatic parking to improve system accuracy, then parking system reliability is improved, but vehicle mobility is reduced
Solution Approach 1:
The system employs dynamic control that switches rear wheel steering operation status based on running mode detection. During automatic parking mode, the system prioritizes reliability by stopping rear wheel steering. During other modes, mobility is prioritized and rear wheel steering operates normally. This dynamic adaptation resolves the contradiction contextually.
3Stability of the object's composition
If rear wheel steering is controlled to improve high-speed stability, then vehicle stability is improved, but automatic parking trace prediction accuracy deteriorates
Solution Approach 1:
The control system segments the operational context into distinct running modes (automatic parking mode vs. other modes). Based on the segmented mode identification, the control unit applies different rear wheel steering control strategies. This segmentation allows the system to maintain trace prediction accuracy during parking while preserving stability-enhancing rear wheel steering during other operations.
Data Source
AI summary
A method of controlling an active rear wheel steering apparatus according to the present invention is a method of controlling a rear wheel steering apparatus of a vehicle with the rear wheel steering apparatus, the method including a step of determining an operation state of the rear wheel steering apparatus, a step of determining a running mode of the vehicle, and a step of controlling the rear wheel steering apparatus of the vehicle according to a result of determining at least one of the operation state of the rear wheel steering apparatus and the running mode of the vehicle.