Adaptive Braking Force Control for Rear-End Collision Avoidance
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Solution Overview
Problem
Existing automotive collision mitigation systems may operate the collision mitigation brake without warning, potentially causing the vehicle to be struck from behind by a rear vehicle due to the lack of operation of the warning brake, leading to increased braking force and potential accidents.
Innovation Solution
An automotive collision mitigation apparatus equipped with obstacle detection, collision time calculation, collision avoidance assist, collision damage mitigation, operation judgment, and damage mitigation braking force reduction means, which detects obstacles, calculates collision time, assists in avoiding collisions, mitigates damage, judges operation necessity, and reduces braking force when the collision avoidance assist does not operate, thereby preventing rear-end collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the collision mitigation brake is operated with large braking force to mitigate collision damage, then the collision damage mitigation capability is improved, but the risk of being struck from behind by a rear vehicle increases
Solution Approach 1:
The system performs preliminary detection of obstacles and calculates collision time in advance. The operation judgment means determines whether the driver will operate the brake before the collision mitigation brake is activated. This preliminary assessment allows the system to prepare appropriate braking force levels based on predicted driver response, thereby mitigating collision damage while reducing the risk of rear-end collisions through controlled braking force application.
Solution Approach 2:
The braking force of the collision mitigation brake is made dynamic rather than fixed. The damage mitigation braking force reduction means adjusts the braking force based on whether the collision avoidance assist means operated. This dynamic adjustment allows the system to apply appropriate braking force levels - full force when collision avoidance was attempted, reduced force when it wasn't - thereby resolving the contradiction between collision damage mitigation and rear-end collision risk.
2Loss of time
If the collision mitigation brake operates without warning brake operation, then the response time for collision mitigation is improved, but the visibility to rear vehicles is reduced
Solution Approach 1:
The system changes the operational parameters of the brake means based on the operation judgment. When the collision avoidance assist means does not operate, the damage mitigation braking force reduction means reduces the braking force parameter. This parameter change allows the system to maintain rapid response capability while reducing the abruptness of braking, thereby improving visibility to rear vehicles and reducing the risk of rear-end collisions.
3Reliability
If the braking force is increased to ensure collision avoidance, then the collision avoidance effectiveness is improved, but the comfort and safety regarding rear-end collisions deteriorates
Solution Approach 1:
The system uses feedback from the operation judgment means to control the braking force application. The operation judgment means monitors whether the driver is attempting collision avoidance, and this feedback information is used by the damage mitigation braking force reduction means to adjust the braking force. This feedback mechanism ensures that high braking force is applied only when necessary for collision avoidance, while reducing braking force when driver action is detected, thereby maintaining collision avoidance effectiveness while improving comfort and safety regarding rear-end collisions.
Data Source
AI summary
A collision mitigation controller drives a target brake to be controlled for assisting driver's collision-avoidance operation when a calculated collision time is less than an automatic brake a1 judgment line which is determined in advance. The controller drives the automatic brake a1 in order to mitigate damage generated by a collision with an obstacle or another vehicle when the collision time is less than an automatic brake a2 judgment line which is also less than the automatic brake a1 judgment line. The controller decreases the braking force for the automatic brake a2 when judged that the automatic brake a1 is not driven, as compared with the judgment where the automatic brake a1 is driven. When the automatic brake a2 drives the target brake, it is possible to avoid a collision where own vehicle is struck from behind by the rear vehicle which runs on a same traffic lane.