Vehicle Control Processor Steering Torque Adaptation
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Solution Overview
Problem
Existing vehicle steering assist techniques for preventing lane departure cause driver discomfort and stress due to frequent and unnecessary steering interventions, especially when the vehicle travels close to the lane boundary.
Innovation Solution
A vehicle control processor that generates steering forces based on specific characteristics, exerting a first force when the vehicle approaches the lane boundary and a stronger second force when it approaches the road end, minimizing unnecessary interventions and optimizing safety by adjusting the steering control method based on the width of the side strip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steering force is exerted to prevent lane departure when the vehicle travels close to the lane boundary, then lane departure prevention is improved, but driver comfort and stress level deteriorate due to frequent unnecessary interventions
Solution Approach 1:
The patent segments the steering control into two distinct modes: a first steering characteristic for when the vehicle is between the lane boundary and a threshold position, and a second steering characteristic for when the vehicle is between the threshold position and the road end. This segmentation allows the system to apply appropriate steering force only when necessary, avoiding unnecessary interventions that cause driver discomfort while maintaining reliable lane departure prevention.
Solution Approach 2:
The patent implements dynamic steering control by continuously monitoring the vehicle's lateral position relative to the lane boundary and road end, and adjusting the steering characteristic based on the detected position. The control processor dynamically switches between first and second steering characteristics depending on whether the vehicle is in the threshold region or the danger region, ensuring that steering intervention is applied only when the vehicle approaches the road end, thereby maintaining driver comfort while preventing lane departure.
2Adaptability or versatility
If steering force changes every time the width between roadway outer line and road end changes, then adaptation to different road conditions is improved, but driver stress and discomfort increase due to frequent steering adjustments
Solution Approach 1:
The patent applies local quality by defining different steering characteristics for different spatial regions: the first steering characteristic applies locally when the vehicle is between the lane boundary and the threshold position, while the second steering characteristic applies locally when the vehicle is between the threshold position and the road end. This localized approach ensures that steering force changes only when the vehicle enters the threshold region, adapting to different road widths without causing frequent unnecessary adjustments that would increase driver stress.
3Reliability
If steering force is exerted to avoid departure when the vehicle maintains constant distance from lane boundary, then lane departure prevention is improved, but unnecessary control intervention occurs causing driver discomfort
Solution Approach 1:
The patent implements preliminary action by setting a threshold position between the lane boundary and the road end, and only exerting steering force when the vehicle approaches this threshold position or the road end. The control processor calculates the distance from the lane boundary to the road end, determines the threshold position based on this distance, and activates steering control only when the vehicle's lateral position indicates imminent risk of departure. This preliminary action approach prevents unnecessary control interventions while maintaining reliable lane departure prevention.
Data Source
AI summary
A vehicle control processor and method capable of preventing departure to an off-road, to reduce driver discomfort, irritation and stress. The control processor calculates a width of a side strip between a left mark line and a road end based on information from a camera. When the width is wider than a specified width, steering torque based on first and second steering characteristics are exerted. The steering torque based on the first steering characteristic is exerted when a vehicle lateral end is located within a range from a left mark line outer end to a characteristic switching position, set in accordance with the width of the side strip between the left mark line and the road end, and the steering torque based on the second steering characteristic is exerted when the vehicle lateral end is located within a range from the characteristic switching position to the road end.