Speed Limit Display Logic for Temporary Roadwork Sections
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Solution Overview
Problem
Existing driver assistance systems struggle to accurately display speed limits, particularly in sections where temporary speed limits are set, as these limits are not registered in map information, leading to incorrect speed limits being displayed.
Innovation Solution
A driver assistance method and system that reads speed limits from map information, displays them on a display device, and disables updates based on map information in sections with temporary speed limits, ensuring accurate display of actual speed limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the speed limit is updated based on map information, then the speed limit can be displayed even in sections without speed limit traffic signs, but incorrect speed limits will be displayed in sections with temporary speed limits
Solution Approach 1:
The system uses camera-based traffic sign recognition to detect actual speed limit signs on the road and feeds this information back to correct or override the map-based speed limit information. When a traffic sign is detected, the system prioritizes the visually recognized speed limit over the map information, ensuring accuracy in sections with temporary or updated speed limits.
Solution Approach 2:
The patent introduces traffic sign recognition technology as an intermediary mechanism between the map information system and the display system. The camera captures images of actual traffic signs, and the recognition system processes these images to extract current speed limit information, which then serves as a mediator to update or correct the speed limit displayed to the driver.
2Measurement precision
If traffic sign recognition is implemented to detect temporary speed limits, then accurate speed limits can be displayed in temporary sections, but the system complexity increases
Solution Approach 1:
The system integrates multiple functions into a unified architecture: the camera serves both for general road monitoring and specific traffic sign detection; the processor handles both map information processing and image recognition; and the display system presents both map-based and recognition-based speed limit information. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The patent combines the map-based speed limit information system with the camera-based traffic sign recognition system into a single integrated speed limit display system. The two information sources are merged through a priority judgment mechanism that determines which source takes precedence, eliminating the need for separate independent systems and reducing overall complexity.
Data Source
AI summary
A driver assistance method that is applied to a vehicle includes: reading a speed limit at a position at which the vehicle is traveling, from map information in which the speed limit is registered; displaying the speed limit read from the map information on a display device; and disabling updating of the speed limit to be displayed on the display device based on the map information in a first section in which a temporary speed limit is set, even when the speed limit registered in the map information changes.