Speed Alarm System Road Type Transition Notification
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Solution Overview
Problem
Existing speed alarm systems often provide excessive or inappropriate warnings to vehicle occupants, causing nervousness due to repeated alerts when the vehicle's speed exceeds or is below the speed limit, regardless of the road type.
Innovation Solution
A speed alarm system that includes a vehicle position detecting unit, map data storage, an entrance determining unit, and a notification unit, which alerts the driver only when the vehicle enters a different road type and the integrated travel distance is within a predetermined limit, varying by road type, to provide appropriate warnings and prevent excessive notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If warnings are given whenever the vehicle speed exceeds the speed limit, then the driver is notified of speeding violations, but the occupant becomes nervous due to excessive repeated warnings
Solution Approach 1:
The patent applies local quality by differentiating notification behavior based on road type. When the vehicle enters a different road type (e.g., from expressway to general road), the system provides speed limit notifications with a distance threshold, whereas on the same road type, no notifications are given even if speeding occurs. This localized differentiation resolves the contradiction by providing necessary warnings only when road type changes occur, maintaining reliability while reducing excessive notifications that cause occupant nervousness.
2Loss of information
If warnings are given at all speed limit points, then complete speed limit information is provided, but inappropriate warnings are given even when vehicle speed is below the speed limit
Solution Approach 1:
The patent applies dynamics by making the notification system adaptive to vehicle speed conditions. The notification unit dynamically adjusts its behavior based on real-time speed detection: it provides notifications only when the vehicle speed exceeds the speed limit and the integrated travel distance on the new road type is within the predetermined threshold. This dynamic adjustment ensures complete speed limit information is provided when relevant, while eliminating inappropriate warnings when the vehicle is already compliant with speed limits.
3Productivity
If the notification system activates on all road types, then comprehensive speed monitoring is achieved, but the notification frequency becomes excessive and repetitive
Solution Approach 1:
The patent applies segmentation by dividing the road network into different road type segments (expressway, general road, minor street, etc.). The notification system is activated only when the vehicle transitions between these segmented road types, rather than continuously on all road types. This segmentation maintains comprehensive speed monitoring coverage across different road categories while significantly reducing notification frequency by eliminating repetitive alerts within the same road type segment.
Data Source
AI summary
A speed alarm system includes: a vehicle position detecting unit that detects a position of a vehicle; a map data storage unit that stores map data including information on a type of a road and a speed limit of the road; an entrance determining unit that determines whether the vehicle enters a different type of road from the type of the road; an integrated travel distance detecting unit that detects an integrated travel distance on a road which the vehicle has entered and a speed detecting unit that detects a speed of the vehicle on the road which the vehicle has entered, when the entrance determining unit determines that the vehicle enters the different type of road from the type of the road before the vehicle enters; and a notification unit that gives at least an auditory or visual alarm to an occupant of the vehicle when the integrated travel distance is equal to or less than a predetermined distance and the speed of the vehicle is higher than the speed limit.