Power Steering Feedback for Excessive Steering Suppression
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Solution Overview
Problem
Existing power steering systems fail to prevent excessive steering input by drivers in dangerous situations, leading to vehicle instability and compromising obstacle avoidance performance during emergency maneuvers.
Innovation Solution
A vehicle control system that utilizes sensors to detect longitudinal and lateral accelerations, determines a limit steering angle based on these accelerations, and generates a control signal to suppress excessive steering through the power steering system, optionally accompanied by a warning to the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driver steers excessively during emergency avoidance, then the steering angle increases to maximize obstacle avoidance, but the vehicle stability is compromised leading to understeer or oversteer
Solution Approach 1:
The control apparatus continuously monitors the steering angle via a steering angle sensor and compares it against a dynamically calculated limit steering angle. When the current steering angle approaches or exceeds the limit, the system provides feedback by generating a control signal to the power steering system to suppress excessive steering input, thereby maintaining vehicle stability while allowing necessary steering response
Solution Approach 2:
The system dynamically adjusts the limit steering angle parameter based on real-time vehicle operating conditions including longitudinal acceleration, lateral acceleration, vehicle speed, and steering angle. By changing this parameter adaptively rather than using a fixed threshold, the system allows maximum steering input within stability margins under different driving conditions
2Ease of operation
If the power steering system provides full steering assistance, then the steering effort is reduced and steering responsiveness is improved, but excessive steering input cannot be prevented
Solution Approach 1:
The power steering system transitions from a static assistance mode to a dynamic control mode where the assistance level is continuously adjusted based on real-time steering angle monitoring. The system calculates a limit steering angle based on current vehicle conditions and dynamically modulates the power steering torque to suppress excessive steering while maintaining assistance within safe limits, thereby preserving both ease of operation and reliability
3Stability of the object's composition
If the limit steering angle is set conservatively low, then vehicle stability is maintained, but the obstacle avoidance capability is reduced
Solution Approach 1:
The system performs preliminary calculations of the limit steering angle based on predicted vehicle behavior and current operating conditions before excessive steering occurs. By using longitudinal acceleration, lateral acceleration, and vehicle dynamics parameters to pre-calculate safe steering limits, the system prepares suppression thresholds in advance that allow maximum safe steering input for each specific driving scenario
Solution Approach 2:
The limit steering angle is not a fixed conservative value but a dynamic parameter that adjusts continuously based on vehicle speed, longitudinal acceleration, lateral acceleration, and steering angle. This dynamic adjustment allows the system to permit larger steering angles when vehicle conditions support higher stability margins while maintaining conservative limits when conditions are critical
Data Source
AI summary
A method and an apparatus prevents excessive steering. The method may allow for controlling a vehicle by obtaining a longitudinal acceleration of the vehicle, determining a limit lateral acceleration based on the longitudinal acceleration of the vehicle, determining a limit steering angle based on the limit lateral acceleration, determining whether a current steering angle exceeds the limit steering angle and suppressing excessive steering angle of the vehicle in response to a determination that the current steering angle exceeds the limit steering angle.