Intersection Collision Braking Control for Non-Priority Roads
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Solution Overview
Problem
Conventional collision avoidance support devices often delay automatic braking for non-priority roads, leading to delayed collision prevention and unnecessary braking for non-priority roads, which can result in delayed collision avoidance and unnecessary vehicle stops.
Innovation Solution
A collision avoidance support device that acquires surrounding information to determine if a road is a non-priority road, relaxing the automatic braking determination conditions to enable earlier braking by expanding the collision mode range and adjusting reference values, allowing for earlier permission of automatic braking when a non-priority road is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic braking determination conditions are strict to avoid unnecessary braking on priority roads, then false braking is reduced, but collision avoidance timing is delayed on non-priority roads
Solution Approach 1:
The patent applies dynamics by making the braking determination conditions variable based on road priority status. The control unit dynamically adjusts the determination threshold: using stricter conditions for priority roads to avoid false braking, and relaxed conditions for non-priority roads to enable timely collision avoidance. This dynamic adaptation resolves the contradiction between braking accuracy and collision avoidance timing.
Solution Approach 2:
The patent implements local quality by applying different determination conditions to different road types. Instead of using uniform braking criteria, the system applies locally optimized conditions: strict criteria (higher threshold) for priority roads and relaxed criteria (lower threshold) for non-priority roads. This localized approach allows the system to maintain high braking accuracy on priority roads while enabling timely response on non-priority roads.
2Ease of operation
If automatic braking is delayed until other vehicle cannot avoid collision to prevent unnecessary stops, then false braking is reduced, but collision prevention is delayed
Solution Approach 1:
The system dynamically adjusts the braking trigger threshold based on road priority. For non-priority roads, the threshold is lowered (relaxed conditions), allowing earlier braking initiation that prioritizes collision avoidance speed. For priority roads, the threshold remains higher, maintaining braking appropriateness by avoiding unnecessary stops when the own vehicle has right of way.
Solution Approach 2:
The patent changes the determination parameter (braking threshold) based on road priority status. By modifying this critical parameter from fixed to variable, the system achieves both goals: appropriate braking judgment through adaptive threshold selection and improved collision avoidance speed through relaxed thresholds on non-priority roads where earlier intervention is beneficial.
Data Source
AI summary
A collision avoidance support device configured to determine whether or not automatic braking for decelerating an own vehicle should be executed based on a predetermined determination condition in a situation where it is determined that there is a possibility of a collision between another vehicle traveling on a road intersecting an own vehicle road and the own vehicle, to decelerate the own vehicle by the automatic braking when it is determined that the automatic braking should be executed, and further to, when it is determined that the own vehicle road is a non-priority road, make it easier to be determined that the automatic braking should be executed by relaxing the predetermined determination condition as compared to when it is determined that the own vehicle road is not a non-priority road.