Rear Wheel Steering Control for Collision Avoidance Stability
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Solution Overview
Problem
Existing chassis integrated control systems, such as MDPS, ESC, and AWD, fail to ensure vehicle stability during avoidance steering, as they do not effectively increase transverse distance, leading to potential instability during head-on collision avoidance maneuvers.
Innovation Solution
An avoidance steering assistance apparatus utilizing Rear Wheel Steering (RWS) control, which calculates and adjusts the RWS control amount based on vehicle speed, driver steering angle, and steering angular velocity to maximize transverse distance and stability, including automatic steering or braking when necessary, and enters a stabilization control mode when the vehicle becomes unstable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If avoidance steering control is performed based on yaw rate, then collision avoidance is achieved, but vehicle stability is not ensured
Solution Approach 1:
The patent applies dynamics by transitioning from static yaw rate-based control to dynamic transverse distance-based control. The control amount is continuously adjusted based on real-time transverse distance calculations, vehicle speed, and steering angle, enabling the system to adapt to changing driving conditions while maintaining both collision avoidance effectiveness and vehicle stability.
Solution Approach 2:
The patent changes the control parameter from yaw rate to transverse distance. By calculating the actual transverse distance achieved during avoidance steering and using this as the basis for control amount determination, the system ensures that collision avoidance is performed with quantifiable and controllable transverse displacement, thereby maintaining vehicle stability.
2Reliability
If transverse distance is increased through avoidance steering, then collision avoidance performance is improved, but vehicle stability deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring the actual transverse distance achieved during avoidance steering and using this information to adjust the control amount. The system calculates transverse distance based on vehicle speed, steering angle, and time, then feeds this back into the control algorithm to determine the appropriate RWS control amount, ensuring both adequate collision avoidance and maintained stability.
Solution Approach 2:
The system dynamically adjusts the RWS control amount based on real-time vehicle state parameters including speed, steering angle, and calculated transverse distance. This dynamic adjustment allows the system to optimize the balance between achieving sufficient transverse distance for collision avoidance and maintaining vehicle stability throughout the maneuver.
3Reliability
If RWS control amount is increased to ensure transverse distance, then collision avoidance performance is improved, but vehicle instability increases
Solution Approach 1:
The patent changes the control strategy by introducing transverse distance as a key parameter for determining RWS control amount. Instead of using fixed or yaw rate-based control, the system calculates the actual transverse distance achieved and uses this to dynamically adjust the control amount, ensuring optimal balance between collision avoidance effectiveness and vehicle stability.
Solution Approach 2:
The system employs dynamic control by continuously adjusting the RWS control amount based on real-time parameters including vehicle speed, steering angle, and calculated transverse distance. This dynamic adjustment mechanism prevents excessive control inputs that could cause instability while ensuring sufficient transverse distance is achieved for effective collision avoidance.
Data Source
AI summary
An apparatus for assistance avoidance steering is provided. The apparatus includes a processor configured to perform avoidance steering control based on Rear Wheel Steering (RWS) control when a head-on collision risk is sensed, and a storage configured to store data and an algorithm runnable by the processor. The avoidance steering control is based on the algorithm.