Automatic Braking Control Balancing Front and Rear Collision Risk
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Solution Overview
Problem
Drivers often fail to notice when a traffic light turns green while distracted, leading to inefficient traffic flow and increased risk of collisions at intersections.
Innovation Solution
A vehicle vision system using forward-facing cameras detects when a leading vehicle starts moving at a traffic light and alerts the driver, or automatically initiates vehicle movement, to improve traffic flow and reduce collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the equipped vehicle applies full braking to avoid collision with the leading vehicle, then the risk of front collision is reduced, but the risk of rear collision with following vehicles increases
Solution Approach 1:
The braking system dynamically adjusts brake application based on real-time detection of following vehicles. When no following vehicle is detected, full braking is applied to avoid the leading vehicle. When a following vehicle is detected within a threshold distance, the brake application is reduced or delayed, creating a dynamic response that adapts to changing traffic conditions and eliminates the need to choose between front and rear collision risks
Solution Approach 2:
The system uses feedback from rearward-facing cameras to detect following vehicles and adjust braking behavior accordingly. The detection of following vehicles provides feedback that modifies the braking response, allowing the system to reduce brake application when safe following distance cannot be maintained by the following vehicle, thereby preventing rear-end collisions while still attempting to avoid front collisions
2Reliability
If additional sensors are added to detect following vehicles, then rear collision risk is reduced, but system complexity and cost increase
Solution Approach 1:
The rearward-facing camera serves multiple functions: it detects following vehicles for braking control and provides visual information for overall situational awareness. By making the camera multi-functional, the system avoids adding dedicated sensors solely for following vehicle detection, reducing overall system complexity while achieving rear collision avoidance
Solution Approach 2:
The existing camera infrastructure on the vehicle is utilized for dual purposes - forward collision avoidance and following vehicle detection. The system makes the existing hardware work harder by processing additional information from the rearward-facing camera, eliminating the need for separate dedicated sensors and reducing system complexity
Data Source
AI summary
A vehicular automatic braking system includes a forward-viewing camera, a rearward-viewing camera and a radar sensor disposed at an equipped vehicle. When the equipped vehicle is travelling in a traffic lane of a road and a leading vehicle is present forwardly of the equipped vehicle and travelling in the same traffic lane, braking of the equipped vehicle is automatically controllable to mitigate collision by the equipped vehicle with the leading vehicle. Responsive to determination by the vehicular automatic braking system that a following vehicle is following the equipped vehicle and when the determined following vehicle is within a threshold distance from the equipped vehicle and is approaching the equipped vehicle above a threshold rate of approach, automatic braking of the equipped vehicle to mitigate collision by the equipped vehicle with the leading vehicle is adjusted to mitigate collision at the rear of the equipped vehicle by the determined following vehicle.