Steering Avoidance Control for Vehicle Lane Keeping
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Solution Overview
Problem
Existing vehicle collision avoidance systems rely heavily on braking, which may not be sufficient at high speeds, and there is a need for technologies that can avoid collisions with forward obstacles without departing the driving lane, especially in dense traffic conditions.
Innovation Solution
A vehicle system equipped with sensors and a controller that calculates lateral movement distances to determine steering-based avoidance paths, ensuring the vehicle does not leave its lane during obstacle avoidance by comparing calculated movement distances with lane proximity, and switching to braking if lane departure is imminent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steering control is used to avoid collision with forward obstacle, then collision avoidance capability is improved, but risk of departing driving lane increases
Solution Approach 1:
The system performs preliminary calculation of the avoidance path and lateral movement distance before executing steering control. The controller calculates whether the vehicle will depart the lane during avoidance maneuver in advance, and only initiates steering control when the calculation confirms lane departure will not occur, thus preventing the harmful effect before it happens.
Solution Approach 2:
The system continuously monitors the vehicle's lateral position and compares it with the calculated avoidance path. The lane detector provides real-time feedback on lane markings, and the controller adjusts or terminates steering control based on this feedback to ensure the vehicle remains within lane boundaries during the avoidance maneuver.
2Loss of time
If braking distance is reduced to improve response time, then collision avoidance speed is improved, but braking effectiveness deteriorates
Solution Approach 1:
The system dynamically switches between braking control and steering control based on real-time conditions. When braking distance is insufficient for safe stopping, the controller transitions to steering-based avoidance control, adapting the collision avoidance strategy to the current speed and distance conditions to maintain effectiveness.
Solution Approach 2:
The system changes the control parameter from braking force to steering angle when braking becomes ineffective. By calculating the lateral movement distance required for avoidance and comparing it with available space, the system transitions from longitudinal control (braking) to lateral control (steering) to achieve collision avoidance when braking parameters no longer provide sufficient safety margin.
Data Source
AI summary
A vehicle includes: a sensor configured to detect an obstacle of a front side of the vehicle to obtain at least one of position information or speed information of the obstacle; a lane detector configured to detect a lane on which the vehicle is located; and a controller configured to calculate a first lateral movement distance for the vehicle to avoid an obstacle through steering, to determine a steering-based avoidance path for the obstacle based on the first lateral movement distance, to determine whether to depart the lane on the steering-based avoidance path, and to control the vehicle to perform steering avoidance control when the vehicle does not depart the lane.