Vehicle Collision Avoidance Braking Assist Control
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Solution Overview
Problem
In collision avoidance assist devices, the accuracy of detecting objects deteriorates during braking, leading to unnatural release of braking assistance due to low-accuracy detection results.
Innovation Solution
A collision avoidance assist device and method that calculates the time to collision and suppresses the release of braking assistance as the time to collision decreases, using an object detection unit, time calculation unit, and assist control unit to maintain braking assistance even with deteriorating detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic braking is executed for collision avoidance assist, then collision avoidance capability is improved, but detection accuracy deteriorates due to deceleration effects
Solution Approach 1:
The system performs preliminary actions by maintaining braking force even when detection accuracy deteriorates during deceleration. The control unit predicts that detection accuracy will worsen as the vehicle approaches the object during braking, and proactively maintains the braking state rather than releasing it based on degraded detection signals, thereby preventing false collision avoidance termination
Solution Approach 2:
The control unit acts as an intermediary between the detection unit and braking system. It receives detection results that may be affected by deceleration, evaluates the collision risk considering the deteriorating detection conditions, and makes informed decisions about maintaining or releasing braking, thus mediating the conflict between detection limitations and safety requirements
2Reliability
If braking force is applied for collision avoidance, then collision prevention is improved, but object detection accuracy deteriorates due to deceleration
Solution Approach 1:
The system applies preliminary anti-action by counteracting the harmful effect of deceleration-induced detection deterioration. When the control unit determines that detection accuracy is likely to worsen due to ongoing braking, it maintains the braking force despite potentially degraded detection signals, thereby preventing the harmful release of braking that would occur if the system reacted to inaccurate detection data
3Speed
If braking for avoidance assist is released based on detection results, then system responsiveness is improved, but unnatural release occurs due to low-accuracy detection during deceleration
Solution Approach 1:
The control unit uses feedback from the detection unit while accounting for the known deterioration of detection accuracy during deceleration. Instead of directly responding to raw detection signals that may be inaccurate, the system incorporates feedback about the deceleration state and adjusts its interpretation of detection results, maintaining braking when detection accuracy is compromised and thus achieving more natural and safe braking behavior
Data Source
AI summary
A collision avoidance assist device that performs an assist for avoiding a collision between a vehicle and an object includes an object detection unit that detects the object around the vehicle, a time calculation unit that calculates a time to collision between the vehicle and the object based on the detection result of the object detection unit, and an assist control unit that suppresses a release of a braking for avoidance assist as the time to collision decreases when an execution of the collision avoidance assist is controlled based on the time to collision.