Steering Control Apparatus Slip Gradient Feedback
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Solution Overview
Problem
When a driver steers a vehicle, the slip angle can unintentionally exceed a critical angle due to increasing self-aligning torque, leading to potential oversteering issues as the torque decreases sharply beyond a certain slip angle.
Innovation Solution
A steering control apparatus and method that senses vehicle speed, steering angle, and lateral acceleration, estimating a second lateral acceleration and controlling the steering torque based on a slip gradient to prevent excessive slip angles, with the controller releasing control when the steering angle speed inverts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driver provides force against the self-aligning torque to steer the steering device, then the steering device can be steered, but the slip angle may exceed the particular slip angle causing unintentional oversteering
Solution Approach 1:
The controller continuously monitors the slip angle through sensors (vehicle speed, steering angle, lateral acceleration) and provides feedback control. When the slip angle approaches the particular slip angle, the controller adjusts the steering torque to prevent exceeding the critical angle, thereby maintaining steering stability while allowing smooth steering operations
Solution Approach 2:
The system dynamically changes the steering torque parameter based on the slip angle. The controller modifies the steering torque in real-time according to the measured slip angle, adjusting it to maintain the slip angle within the safe range and prevent unintentional oversteering while preserving driver steering intent
2Reliability
If the steering torque is increased to maintain control, then the slip angle can be controlled, but the steering response may become delayed or excessive
Solution Approach 1:
The feedback control system continuously monitors the slip angle and adjusts the steering torque accordingly. This ensures that the steering torque is applied only when and where needed, maintaining slip angle control while avoiding unnecessary delays or excessive responses through real-time adjustment based on actual slip angle measurements
Solution Approach 2:
The system uses dynamic steering torque adjustment based on real-time slip angle measurements. The controller dynamically modifies the steering torque according to the current steering state and slip angle, enabling responsive steering control that adapts to changing conditions without introducing delays or excessive responses
Data Source
AI summary
The present invention relates to a steering control apparatus comprising: a sensing unit configured to sense at least one among a vehicle speed, a steering angle, first lateral acceleration, and a steering angle speed; an estimation unit configured to estimate second lateral acceleration on the basis of the vehicle speed and the steering angle; and a controller configured to control a steering device so that a steering torque increases, on the basis of a slip gradient which indicates a difference between the first lateral acceleration and the second lateral acceleration, wherein the controlling of the steering device is released when the steering angle speed is inverted.