Braking Control System for Post-Impact Collision Management
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Solution Overview
Problem
Automatic emergency braking systems face challenges in determining when to deactivate the brakes after an initial collision to prevent further collisions, as existing systems primarily focus on triggering the brake in anticipation of a collision rather than managing post-impact scenarios, and there is a lack of regulation for preventing impact at high speeds.
Innovation Solution
A braking control system that monitors vehicle speed and approach rate to a target vehicle, allowing driver override only when the driver is not impaired, and modulates brake application based on relative velocity and driver capability, using a combination of sensors including cameras, radar, and ultrasonic sensors to determine collision occurrence and driver attentiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the automatic emergency braking system applies brakes after determining a collision is likely or imminent, then the risk of collision is reduced, but the system cannot determine when to deactivate the brakes after initial collision to prevent further collisions
Solution Approach 1:
The braking control system dynamically adjusts brake application based on real-time monitoring of vehicle speed, approach rate, and driver capability. The system transitions from a static pre-collision braking approach to a dynamic post-impact management mode, continuously evaluating conditions to determine when to maintain or release brakes, thereby preventing further collisions while adapting to changing scenarios
Solution Approach 2:
The system implements continuous feedback monitoring of vehicle speed, approach rate to target vehicle, and driver capability status. This feedback loop enables the braking control system to make informed decisions about brake deactivation timing, resolving the inability to determine when to release brakes after initial collision while maintaining collision prevention
2Ease of operation
If the system allows driver override of automatic braking, then driver control is maintained, but the system cannot prevent high-speed impact when driver is impaired or inattentive
Solution Approach 1:
The braking control system performs self-assessment of driver capability by monitoring various parameters. When the system determines the driver is impaired or inattentive, it automatically maintains brake application without requiring driver override, thereby preventing high-speed impacts while preserving driver control when the driver is capable
Solution Approach 2:
The system introduces an intermediary assessment layer between the driver and brake control. This intermediary monitors driver capability and mediates the override request, allowing driver control when capable but blocking override when impaired, thus resolving the contradiction between maintaining driver control and preventing impairment-related collisions
3Reliability
If the braking control system continuously monitors vehicle speed and approach rate to manage post-impact scenarios, then further collisions are prevented, but the system complexity increases
Solution Approach 1:
The braking control system is designed to perform multiple functions using the same monitoring infrastructure. The existing sensors and processors used for pre-collision detection are extended to also monitor post-impact conditions such as vehicle speed and approach rate. This multi-functionality enables post-impact scenario management without proportionally increasing system complexity
Data Source
AI summary
An automatic emergency braking system for a vehicle includes a forward viewing camera and a control. At least in part responsive to processing of captured image data, the presence of another vehicle closing on the subject vehicle is determined, and a relative speed of the subject vehicle relative to the other vehicle is also determined. Responsive at least in part to a speed of the subject vehicle and the determined relative speed, the control controls the subject vehicle's brake system. Responsive to determination that the driver of the subject vehicle is impaired, the automatic emergency braking system does not allow the driver to override the control's control of the subject vehicle's brake system. Responsive to a determination that the driver of the subject vehicle is not impaired, the automatic emergency braking system allows the driver to override the control's control of the subject vehicle' brake system.