Front Impact Mitigation System Rear Collision Risk
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Solution Overview
Problem
Front impact mitigation systems may inadvertently increase the likelihood of rear collisions by intervening with braking in situations where a trailing object is present, as they prioritize avoiding a leading obstacle, potentially leaving insufficient time or force to prevent a rear impact.
Innovation Solution
A method and system that modify the front impact mitigation control signal by incorporating host vehicle speed and rear object distance data to adjust the time-to-collision calculation, thereby mitigating the risk of rear collisions by altering the braking strategy to account for trailing objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crash imminent braking (CIB) features intervene to avoid collision with a leading obstacle, then front impact mitigation is improved, but the likelihood of rear end collision increases
Solution Approach 1:
The system performs preliminary detection of trailing objects and pre-calculates modified time-to-collision values before the braking event occurs. By detecting the trailing object's presence and position in advance, the system can adjust the braking strategy proactively rather than reactively, preventing the rear collision risk before it materializes.
Solution Approach 2:
The system dynamically adjusts the time-to-collision threshold based on real-time conditions including trailing object detection. Instead of using a fixed CIB intervention threshold, the system modifies the TTC calculation to account for trailing objects, making the braking intervention point adaptable to the current traffic environment. This dynamic adjustment allows the system to delay or modify braking when trailing objects are present, reducing rear collision risk while maintaining front impact mitigation capability.
2Reliability
If standard front impact mitigation control signal is used to avoid leading obstacle, then front collision avoidance is improved, but rear object collision likelihood increases due to aggressive braking
Solution Approach 1:
The system applies different quality characteristics to different aspects of the braking control. Instead of uniformly aggressive braking, the system modifies the braking profile locally by adjusting the intervention threshold based on trailing object conditions. The control signal quality changes from standard to modified TTC-based control when trailing objects are detected, creating a localized adaptation in the braking strategy that reduces rear impact risk while maintaining front collision avoidance.
Solution Approach 2:
The system changes the critical parameter of time-to-collision threshold based on trailing object detection. By modifying the TTC calculation to incorporate trailing object distance and speed, the system transforms the braking control parameter dynamically. This parameter change shifts the braking intervention point to a safer location that accounts for both front and rear traffic conditions, resolving the contradiction between front impact mitigation and rear collision avoidance.
Data Source
AI summary
A front impact mitigation system for a host vehicle and a method for operating a front impact mitigation system. The front impact mitigation system can take into account the position of a rear object that trails the host vehicle to develop a modified front impact mitigation control signal that at least partially mitigates the likelihood of certain rear impact collisions between the rear object and the host vehicle when the host vehicle is responding to the presence of an impending leading obstacle. A modified front impact mitigation control signal may be developed to account for the speed of the host vehicle and the distance that the rear object trails the host vehicle.