Dynamic Brake Command Adjustment for Collision Avoidance
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Solution Overview
Problem
Existing collision avoidance systems that automatically engage vehicle brakes without driver intervention often result in overly conservative braking, leading to the host vehicle stopping short of or slowing down more than the target vehicle, potentially causing rear-end collisions or other undesirable situations due to their reliance on predetermined static brake commands.
Innovation Solution
A method and system that utilize dynamic brake commands adjusted throughout an autonomous braking event based on real-time sensor readings to determine the necessary deceleration and maintain a desired relative distance or velocity with the target vehicle, incorporating sensors for vehicle and target vehicle data and a control module to generate and modify brake commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If predetermined static brake commands are used for autonomous braking, then collision avoidance is achieved, but the braking is overly conservative causing the vehicle to stop well short of or slow down more than the target vehicle
Solution Approach 1:
The patent transitions from static predetermined brake commands to dynamic brake commands that are continuously adjusted during the autonomous braking event. The control module modifies brake commands in real-time based on target vehicle deceleration and relative distance, allowing the braking force to adapt to changing conditions rather than following a fixed predetermined profile.
Solution Approach 2:
The system implements feedback by continuously monitoring target vehicle deceleration and relative distance between vehicles, then using this information to adjust brake commands dynamically. The control module receives feedback about the target vehicle's motion and the host vehicle's position, and modifies braking force accordingly to match the target vehicle's deceleration pattern.
2Reliability
If constant deceleration is applied during autonomous braking, then collision is prevented, but the host vehicle may be subject to rear end crash by trailing vehicle
Solution Approach 1:
The control module continuously monitors the relative distance to the target vehicle and adjusts brake commands based on feedback about target vehicle deceleration. This feedback mechanism allows the system to match the target vehicle's deceleration profile more closely, preventing excessive slowing that would expose the host vehicle to rear-end collision risks from trailing vehicles.
Solution Approach 2:
The system changes the deceleration parameter dynamically during the braking event rather than maintaining a constant deceleration value. By adjusting brake force based on real-time conditions and target vehicle behavior, the deceleration profile adapts to prevent both front collision with the target vehicle and rear collision with trailing vehicles.
Data Source
AI summary
A collision avoidance system and method that may be used to prevent, avoid and/or mitigate a collision between a host vehicle and a target vehicle by engaging in autonomous braking once an imminent crash is detected. Unlike other methods that are only capable of autonomous braking according to predetermined and static brake commands, the present method may use dynamic brake commands throughout an autonomous braking event so that the deceleration of the host vehicle can be continuously adjusted such that it concludes at a reasonable distance away from the target vehicle. According to one example, the collision avoidance system maintains a relative distance (Δd) and/or a relative velocity (Δv) between the host and target vehicles during the autonomous braking event.