Lane-Keeping Steering Assist to Prevent Hunting in Narrow Lanes
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Solution Overview
Problem
Existing driver assist systems frequently alternate between assist and non-assist modes in narrow lanes, leading to unnecessary steering wheel operations and hunting behavior due to frequent changes in steering assist force direction.
Innovation Solution
A driver assist system that calculates and adjusts limit steering angles based on actual steering angles and lane conditions to prevent vehicle deviation by applying steering reaction forces when the actual steering angle exceeds the limit, and imaginarily unifies edge lines in narrow lanes to stabilize steering control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the steering assist force is applied frequently to return the vehicle to the lane center in narrow lanes, then the vehicle position control is improved, but the steering operation stability deteriorates due to hunting and repetitive mode switching
Solution Approach 1:
The system dynamically adjusts the assist control execution determination based on vehicle speed. At higher speeds where hunting is more problematic, the system becomes less prone to frequently switching between assist and non-assist modes. The control strategy adapts to changing operating conditions, particularly speed variations, to maintain stability while preserving position control accuracy.
Solution Approach 2:
The system changes the control parameters (assist force magnitude and mode switching thresholds) based on vehicle speed. By modifying these parameters dynamically, the system reduces the frequency of mode switching at speeds where hunting occurs, thereby stabilizing steering operations while maintaining effective lane position control when needed.
2Speed
If the steering assist force is applied immediately when the vehicle deviates from the lane center, then the response speed is improved, but the steering operation complexity increases due to frequent direction changes
Solution Approach 1:
The system implements dynamic control strategy that adapts to vehicle speed. At higher speeds, the system delays or reduces assist force application to prevent excessive steering corrections and hunting. At lower speeds, more aggressive correction is permitted. This dynamic adaptation simplifies steering operations by avoiding unnecessary frequent direction changes while maintaining responsive lane position control when appropriate.
Data Source
AI summary
A driver assist system for avoiding hunting of an assist control. The driver assist system comprises: an edge line detector that detects edge lines of a predetermined lane; a limit steering angle detector that detects a limit steering angle at which a vehicle reaches the edge line in a predetermined time; an actual steering angle detector that detects an actual steering angle from a reference position; a comparator that compares the actual steering angle with the limit steering angle; a steering assistor that establishes a steering reaction force when the actual steering angle exceeds the limit steering angle; a determiner that determines a satisfaction of a condition relating to a lane width; and an adjustor that imaginarily sets the right edge line and the left edge line on the center of the lane, and calculate the limit steering angle based on the imaginary edge line upon the satisfaction of the condition.