Lane Departure Warning Apparatus Threshold Logic
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Solution Overview
Problem
Conventional lane departure warning systems issue unnecessary warnings when a vehicle intentionally leaves its lane to avoid obstacles, causing discomfort to passengers.
Innovation Solution
A lane departure warning apparatus that includes a detector, a change amount monitoring component, and a warning system, which only issues warnings when the vehicle's deviation from the lane exceeds specific threshold values in terms of distance and rate of change, thereby avoiding unnecessary alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the warning system issues warnings for all lane departures detected by the camera, then the safety monitoring coverage is improved, but unnecessary warnings are generated when the vehicle intentionally changes lanes, causing passenger discomfort
Solution Approach 1:
The system changes the parameter of warning issuance from binary (warn for any lane departure) to conditional (warn only when crossing division lines). By introducing the parameter of division line crossing detection, the system distinguishes between intentional lane changes and unintended deviations, thereby reducing unnecessary warnings while maintaining safety monitoring coverage.
2Measurement precision
If the warning system monitors all vehicle position changes relative to the lane, then the detection precision is improved, but false alarms increase when the vehicle merely approaches the division line without intentional departure
Solution Approach 1:
The system applies local quality by focusing monitoring only on specific critical locations (division lines) rather than all lane positions. The warning is triggered only when the vehicle crosses the division line, not when it merely approaches or moves within the lane. This localized monitoring approach maintains high detection precision for actual lane departures while eliminating false alarms from normal lane positioning adjustments.
Data Source
AI summary
A lane departure warning apparatus that issues a warning for a lane departure of a vehicle monitors a change amount of a location of the vehicle relative to a division line that defines a travelling lane, in a case where the lane departure warning apparatus has detected the lane departure of the vehicle from the travelling lane. The lane departure warning apparatus is issues the warning to an output device in at least one of cases in which (i) the change amount monitoring part determines that the change amount of the location of the vehicle is equal to or greater than a first threshold value and (ii) the change amount monitoring part determines that the change amount per a unit of time is equal to or greater than a second threshold value.