Adaptive Cruise Control Rear Collision Mitigation
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Solution Overview
Problem
Existing rear driver assistance systems fail to effectively mitigate rear-end collisions by operating independently with front and rear sensors, lacking a comprehensive solution to avoid or mitigate critical situations.
Innovation Solution
A system and method that fuse information from front and rear sensors to adjust the distance between vehicles, automatically increasing the host vehicle's speed and reducing the following distance to a front vehicle while increasing the distance from a rear vehicle posing a collision risk, thereby providing more time for the following vehicle to brake and avoid a collision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the host vehicle maintains a predetermined following distance from the front vehicle, then the safety distance is ensured, but the distance to the rear vehicle decreases increasing collision risk
Solution Approach 1:
The system dynamically adjusts the following distance between the host vehicle and front vehicle based on real-time detection of rear vehicle proximity and collision risk. When a rear-end collision risk is detected, the system reduces the following distance to move the host vehicle closer to the front vehicle, thereby increasing the buffer zone between the host vehicle and the approaching rear vehicle.
Solution Approach 2:
The system takes preliminary action by detecting potential rear-end collision risks before they materialize into actual collisions. By fusing sensor data and predicting potential collision scenarios, the system proactively adjusts the following distance to prevent the harmful situation from occurring in the first place.
2Object-affected harmful factors
If the host vehicle increases speed to increase distance from rear vehicle, then rear-end collision risk is reduced, but fuel consumption increases
Solution Approach 1:
The system applies partial action by making minimal, targeted speed adjustments only when and where necessary to mitigate rear-end collision risk. Rather than continuously increasing speed, the system applies speed changes selectively based on the detected collision risk level, thereby reducing unnecessary energy consumption while still achieving the safety objective.
3Device complexity
If front and rear sensor systems operate independently, then system complexity is reduced, but comprehensive collision mitigation is not achieved
Solution Approach 1:
The system merges the previously independent front and rear sensor systems into a unified collision mitigation framework. By fusing data from both sensor systems, the controller gains comprehensive situational awareness and can make informed decisions about following distance adjustments that consider both front vehicle proximity and rear vehicle collision risk simultaneously.
Solution Approach 2:
The controller is designed with multi-functionality, serving both as an adaptive cruise control system for maintaining following distance from the front vehicle and as a rear-end collision mitigation system. This universal controller integrates multiple functions into a single system, managing both forward and rearward safety concerns without requiring separate dedicated systems.
Data Source
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Figure 3A~3B
AI summary
Methods and systems for controlling a host vehicle to mitigate rear-end collisions. One method includes automatically maintaining the host vehicle at least a predetermined following distance from a front vehicle traveling ahead of the host vehicle. The method also includes detecting a rear vehicle traveling behind the host vehicle and determining when the rear vehicle poses a rear-end collision risk with the host vehicle. In addition, the method includes automatically, by a controller, increasing a speed of the host vehicle when the rear vehicle poses a rear-end collision risk with the host vehicle, and automatically reducing the predetermined following distance to decrease a distance between the host vehicle and the front vehicle and increase a distance between the host vehicle and the rear vehicle when the rear vehicle poses a rear-end collision risk with the host vehicle.