Steering Control Device Lane Keeping Stability
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Solution Overview
Problem
Steering control systems for vehicles often result in unnatural feelings for drivers and unstable vehicle behavior when controlling minute lateral deviations, leading to prolonged periods of deviation from the lane center.
Innovation Solution
A steering control device and method that include a distance calculation unit, steering angle detection unit, and steering control unit, which assist steering based on the angle formed by the lane and a straight line extending forward of the vehicle, fixing the steering angle when the distance between the vehicle and lane center is small, and adjusting assistance based on predetermined angles and angular velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If steering is controlled based on lateral deviation amount even when it is minute, then the vehicle can maintain lane position, but the driver feels the steering control is unnatural and vehicle behavior becomes unstable
Solution Approach 1:
The system changes the control parameter from lateral deviation amount to distance from lane center line. This parameter transformation allows the system to avoid continuous correction of minute deviations while still maintaining accurate lane positioning, thereby improving steering naturalness without sacrificing positioning accuracy
Solution Approach 2:
The system dynamically adjusts steering control based on the calculated distance from the lane center line. When the vehicle is near the center line, the control behavior changes to prevent over-correction, creating a more natural and stable steering experience while maintaining lane position
2Reliability
If steering control continuously corrects minute lateral deviations, then lane position can be maintained, but vehicle behavior becomes unstable and driver experience deteriorates
Solution Approach 1:
By transforming the control parameter from lateral deviation amount to distance from lane center line, the system achieves reliable lane position maintenance while avoiding the instability caused by continuous correction of minute deviations. This parameter change fundamentally alters the control characteristics to improve vehicle behavior stability
Solution Approach 2:
The system extracts only the essential information (distance from lane center line) needed for lane keeping, eliminating the harmful effect of continuous correction based on minute lateral deviations. This extraction approach maintains lane position reliability while removing the source of vehicle behavior instability
Data Source
AI summary
A steering control device includes a distance calculation unit which calculates a distance between a front gaze point, which is on a straight line extending forward of a vehicle from a center of the vehicle, and a center line indicating the center of a lane where a vehicle is traveling, a steering angle detection unit which detects a steering angle of the vehicle, and a steering control unit which causes a motor, which assists steering of the vehicle, to assist the steering based on an angle formed by the lane and the straight line extending forward of the vehicle when the distance is larger than a predetermined distance, and causes the motor to assist the steering so as to fix the steering angle when the distance is the predetermined distance or smaller.