Vehicle Driving Support Device Using Object Acceleration Thresholds
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Solution Overview
Problem
Conventional driving support devices may activate unnecessary alarms or automatic braking when an object decelerates while moving laterally toward a vehicle and then moves out of the collision area, due to delayed detection of near-collision avoidance behavior.
Innovation Solution
A driving support device that includes an object detection unit, a collision prediction unit, a support execution unit, an acceleration calculation unit, and a prohibition unit, where the prohibition unit prevents driving support if the object's acceleration becomes more negative than a threshold, indicating deceleration beyond normal levels, thus reducing the likelihood of a collision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection area is increased to detect laterally moving objects, then the detection accuracy is improved, but unnecessary driving support is triggered when objects decelerate and move out of the collision area
Solution Approach 1:
The system changes the parameter used for collision prediction from lateral movement speed to acceleration. When an object's acceleration becomes more negative than a negative threshold (indicating sudden deceleration), the prohibition unit prohibits driving support. This parameter change allows the system to maintain a large detection area for high detection accuracy while reducing false alarms by recognizing when objects are actively avoiding collision through deceleration.
2Reliability
If the threshold for prohibiting driving support is set based on speed, then the determination is conservative, but it takes time before prohibition control is performed
Solution Approach 1:
The system performs preliminary detection of acceleration changes before the object actually stops or moves completely out of the collision area. By detecting sudden deceleration (negative acceleration beyond a threshold) in advance, the system can prohibit driving support earlier than waiting for speed-based thresholds to be met, reducing the loss of time while maintaining reliable determination through the acceleration criterion.
Data Source
AI summary
A driving support device is mounted to a vehicle. The driving support device includes an object detection unit that detects an object moving in a direction crossing the traveling direction of the vehicle, a collision prediction unit, a support execution unit, an acceleration calculation unit, and a prohibition unit. The collision prediction unit predicts a collision between the object detected by the object detection unit and the vehicle. When the collision prediction unit predicts a collision between the object and the vehicle, the support execution unit performs driving support for reducing the risk of a collision of the vehicle. The acceleration calculation unit calculates the acceleration of the object. When the calculated acceleration has become more negative than a negative threshold, the prohibition unit prohibits the support execution unit from performing the driving support with respect to the object.