Forward Collision Warning Control Using Vehicle Overlap Change
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Solution Overview
Problem
Forward collision warning systems can cause unnecessary alarms when a preceding vehicle turns at intersections, making drivers feel troubled despite the situation not being dangerous.
Innovation Solution
A driving assistance apparatus and method that detects inter-vehicle distance and overlap between a host vehicle and a preceding vehicle, controlling alarm output based on these parameters to suppress unnecessary alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If forward collision warning function detects preceding vehicle and outputs alarm based on inter-vehicle distance, then collision safety is improved, but false alarms at intersections increase making drivers feel troublesome
Solution Approach 1:
The patent applies local quality by making the alarm output characteristic depend on the specific situation (intersection vs. non-intersection). The system detects intersection situations and adjusts alarm behavior locally for these cases, suppressing alarms when the preceding vehicle is turning at intersections while maintaining alarm output for straight-road scenarios. This resolves the contradiction by tailoring the alarm response to local contextual conditions rather than applying a uniform alarm policy.
Solution Approach 2:
The system dynamically adjusts alarm output based on detected situation type. When an intersection situation is detected along with a turning maneuver by the preceding vehicle, the alarm output is dynamically suppressed. For non-intersection situations, the alarm functions normally. This dynamic adaptation allows the system to maintain high reliability for collision warning while improving driver convenience by eliminating false alarms in specific contexts.
2Reliability
If alarm is outputted whenever inter-vehicle distance becomes short, then collision warning reliability is improved, but unnecessary alarms during normal lane changes or turns increase
Solution Approach 1:
The patent introduces situation detection as an intermediary condition between inter-vehicle distance detection and alarm output. The system first detects whether the situation is an intersection scenario, then uses this intermediate information to modulate the alarm output decision. This intermediary layer filters out false alarm scenarios while preserving true collision warnings, thereby improving warning accuracy and reducing false alarm frequency simultaneously.
Solution Approach 2:
The system changes the alarm output parameter based on the detected situation type. When an intersection situation is detected and the preceding vehicle is turning, the alarm output parameter is changed to suppressed or canceled. For non-intersection situations with short inter-vehicle distance, the alarm parameter remains active. This parameter change strategy allows the system to maintain high warning accuracy while minimizing false alarms.
Data Source
AI summary
This driving assistance device comprises: an inter-vehicle distance detection unit which detects an inter-vehicle distance from an own vehicle to a preceding vehicle; an overlap detection unit which detects an overlap (a collision avoidance width) of the own vehicle and the preceding vehicle; and an alarm control unit which controls an alarm output from an information output unit on the basis of the inter-vehicle distance and a change in the overlap.