Vehicle Collision Avoidance Timing Adjustment via Overlap Ratio
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Solution Overview
Problem
Existing driving support systems for vehicles often initiate collision avoidance operations too early due to relying solely on the preceding vehicle intrusion level, which does not account for the lateral motion of the vehicle, leading to unnecessary interventions when the preceding vehicle is exiting the traffic lane.
Innovation Solution
A driving support apparatus that utilizes a target object detection system and lane marker line detection system to calculate an overlap ratio and consider the motion condition of the target object, adjusting the timing of collision avoidance operations based on these factors to ensure appropriate intervention timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the judgement distance is increased based on a large preceding vehicle intrusion level, then collision avoidance is more conservative and safer, but driving support operations are commenced excessively early when the preceding vehicle is exiting the lane, leading to unnecessary interventions
Solution Approach 1:
The system dynamically adjusts the judgement distance based on the motion state of the preceding vehicle. When the preceding vehicle is detected to be moving laterally (exiting the lane), the system reduces the judgement distance compared to when the vehicle is stationary or moving forward. This dynamic adjustment allows the system to maintain high reliability for stationary intrusions while avoiding unnecessarily early interventions when the preceding vehicle is actively exiting the lane.
Solution Approach 2:
The system changes the parameter of judgement distance based on the intrusion level and motion state of the preceding vehicle. By calculating different judgement distances for different scenarios (e.g., larger distance for high intrusion level with lateral motion, smaller distance for high intrusion level with forward motion), the system optimizes both safety and timing accuracy of collision avoidance operations.
2Loss of time
If the judgement distance is decreased based on a small preceding vehicle intrusion level, then driving support operations are timed more precisely for minor intrusions, but collision avoidance may be insufficient for vehicles with large intrusion levels
Solution Approach 1:
The system adjusts the judgement distance parameter according to the intrusion level of the preceding vehicle. For vehicles with small intrusion levels, a smaller judgement distance is used to achieve precise timing. For vehicles with large intrusion levels, a larger judgement distance is used to ensure sufficient collision avoidance time and reliability. This parameter adaptation resolves the contradiction between timing precision and reliability.
Solution Approach 2:
The system applies different judgement distance criteria to different intrusion level scenarios. Instead of using a single uniform judgement distance, the system tailors the judgement distance to the specific intrusion level and motion state of each preceding vehicle, optimizing the collision avoidance operation for each local scenario.
Data Source
AI summary
A driving support apparatus installed in a host vehicle calculates an overlap ratio relating to a target object positioned ahead of the host vehicle within the same traffic lane, as the ratio of the width of the target object to its lateral distance from a lane marker line of the traffic lane, and also detects the motion condition of the object (i.e., stationary, moving towards, or in the same direction as the host vehicle, or moving laterally with respect to the forward direction of the host vehicle). An amount of compensation for retarding or advancing the commencement of a collision avoidance operation by the driving support apparatus is determined based on the overlap ratio and/or the motion condition of the target object.