Intersection Judgment Apparatus for Pedestrian Lateral Displacement
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Solution Overview
Problem
Pre-crash safety systems (PCS) face challenges in accurately determining lateral displacement of pedestrians, leading to unnecessary warnings or failures in detecting intersection risks due to threshold value settings and intermittent object detection by radar and camera systems.
Innovation Solution
An intersection judgement apparatus with distance, direction angle, and displacement calculation circuitry uses multiple threshold condition groups with lower displacement and count thresholds, combined with radar and imaging data fusion, to reliably assess lateral movement of pedestrians, ensuring accurate detection and reducing false alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PCS uses a single threshold value to judge lateral displacement of pedestrians, then the system is simple to operate, but the reliability of judging whether a pedestrian is actually moving significantly along a lateral intersection direction deteriorates
Solution Approach 1:
The patent divides the threshold judgment system into multiple segments by introducing a plurality of threshold condition groups, each with different lower displacement thresholds and count thresholds. This segmentation allows the system to evaluate pedestrian lateral displacement under different conditions, improving judgment reliability while maintaining manageable complexity through structured organization of multiple thresholds.
2Measurement precision
If the PCS lowers the threshold value to reduce missed detections, then the detection sensitivity improves, but the off performance deteriorates due to increased false alarms
Solution Approach 1:
The patent implements dynamic threshold selection by maintaining multiple threshold condition groups with different lower displacement thresholds and count thresholds. The system can adaptively choose appropriate threshold combinations based on detection conditions, allowing high sensitivity detection while maintaining reliable off-performance by selecting less sensitive threshold groups when appropriate.
Solution Approach 2:
The patent changes the parameters of threshold judgment by introducing multiple threshold condition groups with varying lower displacement thresholds and count thresholds. This parameter variation allows the system to adjust its sensitivity and reliability characteristics according to different operational scenarios, resolving the contradiction between detection sensitivity and false alarm rate.
3Reliability
If the PCS requires continuous detection to confirm lateral movement, then the reliability of collision risk judgment improves, but the system fails to detect objects that enter blind spots intermittently
Solution Approach 1:
The patent applies preliminary action by using multiple threshold condition groups with different count thresholds to evaluate lateral displacement before making a final collision risk judgment. This preliminary evaluation with varying threshold requirements allows the system to accumulate detection evidence over time, improving reliability while maintaining sensitivity to intermittent detections through the plurality of threshold conditions.
Solution Approach 2:
The patent implements periodic evaluation by repeatedly assessing lateral displacement against multiple threshold condition groups at different time points. This periodic action with multiple threshold checks allows the system to detect intermittent lateral movements that may occur in blind spots, improving both reliability and detection precision for objects that appear and disappear periodically.
4Reliability
If the PCS takes actions for all detected pedestrians ahead of the vehicle, then the safety coverage is maximized, but unnecessary warnings and automatic braking occur reducing productivity
Solution Approach 1:
The patent applies local quality by evaluating lateral displacement against multiple threshold condition groups with different lower displacement thresholds and count thresholds specific to different judgment scenarios. This localized threshold evaluation allows the system to provide comprehensive safety coverage for high-risk situations while avoiding unnecessary warnings for low-risk cases, thereby maintaining vehicle productivity.
Data Source
AI summary
A vehicle-installation intersection judgment apparatus determines whether a target object such as a pedestrian is located ahead and to one side of the vehicle, and if so, judges whether the object is moving laterally to intersect with the advancement of the vehicle. Successive amounts of lateral displacement of the object are periodically derived, each amount is compared with a displacement threshold, a count is made of the number of times that the displacement threshold is exceeded, and the count is compared with a predetermined count threshold. The judgment concerning the target object is made based upon whether the count threshold is attained.