Vehicle Rear Side Warning Device Relative Speed Threshold
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Solution Overview
Problem
Existing vehicle-use rear side warning devices notify drivers of approaching vehicles without considering the relative relationship between the vehicles, leading to excessive and annoying notifications, even for vehicles that pose no threat.
Innovation Solution
A vehicle-use rear side warning device equipped with a periphery monitoring camera unit, sensor unit, vehicle condition detecting unit, and central processing unit that detects approaching moving objects, calculates relative speeds, and determines appropriate warning outputs based on lane change intentions and safety thresholds to restrict unnecessary notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing rear side warning device notifies the driver of all approaching vehicles in the notification target regions, then the driver is informed of vehicle existence, but excessive notifications are generated for vehicles that pose no threat, causing driver annoyance
Solution Approach 1:
The patent changes the parameter of notification triggering from simple vehicle presence detection to relative speed-based detection. By calculating the relative speed between the own vehicle and approaching vehicles, the system dynamically adjusts which vehicles trigger notifications, thereby reducing false alarms while maintaining safety alerts.
Solution Approach 2:
The system implements feedback by continuously monitoring the relative speed of approaching vehicles and adjusting notification output accordingly. When relative speed exceeds the threshold, notification is activated; when it remains below the threshold, notification is suppressed, creating a closed-loop control system that adapts to real-time conditions.
2Reliability
If the warning device notifies the driver of any approaching vehicle during lane change attempts, then safety is prioritized, but unnecessary warnings are generated for vehicles with sufficient leeway, reducing driving comfort
Solution Approach 1:
The patent introduces relative speed as a critical parameter for determining notification necessity. By setting a reference relative speed threshold, the system distinguishes between threatening vehicles (above threshold) and non-threatening vehicles (below threshold), enabling selective notification that balances safety and comfort.
3Area of stationary object
If the existing system sets fixed notification target regions on the rear side, then the coverage area is defined, but the system cannot adapt to different relative speeds and distances of approaching vehicles
Solution Approach 1:
The patent transforms the static notification target region concept into a dynamic evaluation system. Instead of relying solely on fixed spatial regions, the system dynamically assesses each approaching vehicle based on its relative speed and distance, determining whether it should trigger a notification in real-time.
Data Source
AI summary
An approaching moving object detecting unit that detects an approaching moving object existing within a predetermined range on a rear side of an own vehicle based on outputs of a periphery monitoring camera that acquires an image of the rear side of the own vehicle and a sensor that detects an approaching moving object, a relative speed detecting unit that detects relative speeds of an approaching moving object and the own vehicle, and a warning output determiner that, when an approaching moving object is detected and the own vehicle is attempting to change lane, causes a warning of a warning output unit to be generated when a relative speed detected by the relative speed detecting unit exceeds a reference relative speed with respect to which a lane change can be carried out, are provided with an object of restricting an excessive notification when notifying of the existence of an approaching moving object.