Vehicle Speed Limit Display with Navigation Attribute Sync
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Solution Overview
Problem
Drivers may not visually recognize speed limit signs due to distractions, leading to potential incorrect speed limit notifications, especially when transitioning from one road type to another without proper signage.
Innovation Solution
A driving support device that uses a camera to detect speed limits from road signs and integrates with a car navigation system to display the speed limit on a vehicle's screen, stopping the display when attribute information changes, such as road type or region, to prevent incorrect notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the speed limit is continuously displayed after entering a new road type, then the driver can maintain awareness of the speed limit, but the displayed speed limit becomes incorrect and misleading
Solution Approach 1:
The system dynamically adjusts the display state based on real-time changes in road attributes. When the navigation system detects a change in road type or region attributes, the display unit automatically updates to reflect the new context, ensuring the displayed speed limit remains accurate and relevant to the current driving environment
Solution Approach 2:
The system implements a feedback mechanism where the display unit continuously monitors attribute information from the navigation system. When attribute changes are detected, the system receives feedback and adjusts the speed limit display accordingly, preventing the display of incorrect speed limits while maintaining continuity when appropriate
2Measurement precision
If the driver relies on visual recognition of speed signs, then the speed limit information can be accurately obtained, but the driver may overlook the speed sign due to distractions
Solution Approach 1:
The display unit acts as an intermediary that translates and presents speed limit information in a format easily perceivable by the driver. By processing and displaying the speed limit through the navigation system's screen, the information becomes more accessible and less dependent on the driver's direct visual attention to road signs
Solution Approach 2:
The system creates a digital copy of the speed limit information and presents it through the navigation display. This copied information is continuously available and does not require the driver to visually locate and interpret physical road signs, reducing the attention burden while maintaining accuracy
3Reliability
If the speed limit display is stopped when attribute information changes, then incorrect speed limit notifications are prevented, but the display may stop prematurely before the driver can react
Solution Approach 1:
The system performs preliminary detection of attribute changes through the navigation system before they become critical. By monitoring attribute information in advance and preparing to update the display accordingly, the system ensures smooth transitions without abrupt stoppages that would compromise driver response time
Data Source
AI summary
A driving support device detects a speed limit by imaging a speed sign indicating the speed limit of a traveling lane. Also, the driving support device continuously acquires attribute information from a car navigation system. The speed limit recognized from a road sign is displayed on a screen mounted in a vehicle. When the speed limit recognized from the road sign is not equal to a speed limit acquired from the car navigation system, a display time of the speed limit is limited. When the attribute information is changed, display of the speed limit is stopped.