Vehicle Notification Apparatus Using Relative Speed and Distance
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Solution Overview
Problem
Existing vehicle notification systems fail to alert occupants to potential collisions with non-subject vehicles effectively, as they provide warnings based solely on distance without considering relative speed, leading to both missed alerts and bothersome notifications.
Innovation Solution
A vehicle notification apparatus that determines whether a subject vehicle is on a road where lane changes are allowed, and adjusts notifications based on both distance and relative speed between the subject and non-subject vehicles, only providing alerts when a lane change could avoid a collision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a warning is given based solely on distance between vehicles, then the notification system is simple to operate, but the reliability of collision avoidance alerting is reduced due to missed alerts and bothersome notifications
Solution Approach 1:
The notification determination portion changes the parameters used for warning determination from distance-only to a combination of distance and relative speed. This allows the system to maintain simple operation while significantly improving reliability by considering both parameters together to determine whether lane change is possible and whether notification is necessary
2Reliability
If notifications are provided for all vehicles within warning range, then the reliability of collision avoidance is improved, but the ease of operation deteriorates due to bothersome notifications to occupants
Solution Approach 1:
The notification system applies local quality by providing different notification behaviors for different spatial situations. When a rearward vehicle is in a different lane and no forward vehicle exists in the same lane, no notification is provided regardless of distance or speed. This selective approach improves ease of operation by eliminating bothersome notifications while maintaining reliability for actual collision risks
3Reliability
If the notification system considers both distance and relative speed, then the reliability of collision risk assessment is improved, but the device complexity increases
Solution Approach 1:
The determination system is segmented into distinct functional portions: a determination portion that assesses lane change possibility based on road conditions and vehicle positions, and a notification determination portion that assesses collision risk based on distance and relative speed. This segmentation improves reliability through comprehensive assessment while managing complexity by dividing functions into logical modules
Data Source
AI summary
A vehicle notification apparatus is equipped to a subject vehicle having a notification portion for providing a notification to an occupant, and outputs, to the notification portion, a notification signal for providing the notification about a non-subject vehicle. The vehicle notification apparatus includes a determination portion determining whether the subject vehicle is travelling on a road where a lane change is allowed, and a notification determination portion determining whether to output the notification signal to the notification portion according to a distance between the subject vehicle and the non-subject vehicle and a relative speed of the non-subject vehicle with respect to the subject vehicle when the determination portion determines that the subject vehicle is travelling on the road where the lane change is allowed.