Rear Cross-Traffic Alert Filtering for Fewer False Warnings
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Solution Overview
Problem
Conventional rear cross traffic alert systems often issue unnecessary warnings due to their reliance on Time To Collision (TTC) and crossing prediction, which can activate warnings for objects far away from the subject vehicle, even if they do not pose a danger.
Innovation Solution
A vehicle object detection system that uses a comparison of relative and absolute speeds, estimated arrival positions, and current positions to determine if a detected object is an alert object, suppressing warnings when specific conditions are met, such as the object being far away or not approaching the subject vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RCTA systems use TTC and crossing prediction to detect target objects, then the system can identify potential collision dangers, but unnecessary warnings are activated for objects far away that do not pose a danger
Solution Approach 1:
The patent introduces additional evaluation parameters beyond TTC and crossing prediction, specifically: (1) relative speed threshold comparison to determine if the target object is approaching, and (2) longitudinal distance threshold comparison to determine if the target object is within a dangerous distance range. By changing the detection parameters from solely time-based (TTC) to include speed and distance thresholds, the system can distinguish between distant non-threatening objects and genuine collision dangers, thereby reducing false alarms while maintaining reliable danger detection
Solution Approach 2:
The system performs preliminary evaluation of the target object's motion state by comparing relative speed and longitudinal distance against predetermined thresholds before activating warnings. This preliminary action filters out objects that do not meet the danger criteria (distant or non-approaching objects) before the final warning decision is made, preventing unnecessary warnings from being generated in the first place
Data Source
AI summary
A vehicle object detection system configured to generate a judgement on whether a target object which has been detected in the detection area is an alert object, and to output the judgement to a warning which is configured to output a warning to a driver of the subject vehicle based on the judgement indicating that the target object is an alert object, wherein system is configured to generate the judgement based on at least one of a comparison of a difference between a relative speed of the target object with respect to the subject vehicle and an absolute speed of the target object in a transverse direction of the subject vehicle with a specified range, and a comparison of an estimated arrival position of the target object, which is a position the target object is estimated to reach in the detection area in a specific period of time.