Driver Assistance Apparatus for Accurate Speed Limit Display
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional navigation and front sign recognition systems fail to accurately reflect temporarily changed road speed limits due to emergency repairs or unexpected situations, and have poor performance with electronic signs, leading to inadequate driver assistance.
Innovation Solution
A driver assistance apparatus equipped with a camera and V2X communication capabilities that acquires image data, compares speed limits from maps and image data, and updates the displayed speed limits based on the vehicle's location and surrounding conditions, including construction zones and speed changes of other vehicles, while also storing and displaying relevant traffic regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional navigation system or front sign recognition system is used, then the system structure is simple, but the speed limit information accuracy deteriorates because it cannot reflect temporarily changed road speed limits
Solution Approach 1:
The patent combines multiple information sources (map data from server, image data from camera, V2X communication data) into a unified speed limit determination system. The controller integrates these diverse data sources to cross-validate and determine accurate speed limit information, resolving the contradiction by merging simple individual systems into a coordinated multi-source system that maintains accuracy without excessive complexity
Solution Approach 2:
The system performs multiple functions using the same hardware components: the camera serves both for general road sign recognition and for capturing electronic speed limit signs; the controller handles both navigation and speed limit determination; the display system shows both map information and speed limit alerts. This multi-functionality improves speed limit accuracy without proportionally increasing system complexity
2Measurement precision
If conventional front sign recognition system is used, then the device complexity is low, but the recognition performance for electronic signs deteriorates
Solution Approach 1:
The system performs preliminary actions by receiving map data from the server before the vehicle reaches the location, and by using V2X communication to obtain advance information about electronic signs and speed limit changes. This allows the system to prepare recognition algorithms and compare expected signs with actual camera captures, significantly improving electronic sign recognition performance without requiring complex real-time-only processing
Solution Approach 2:
The system implements feedback mechanisms where the controller compares detected signs with expected signs from map data and V2X information. When discrepancies are found (such as temporary speed limit changes), the system uses this feedback to adjust its recognition and display behavior, thereby improving electronic sign recognition accuracy through iterative validation rather than relying on complex single-pass recognition
3Measurement precision
If the system displays speed limit based on map data only, then the information source is reliable, but the real-time accuracy deteriorates because it cannot reflect temporary changes
Solution Approach 1:
The patent introduces V2X communication as an intermediary between the map data system and the real-time detection system. This intermediary provides timely updates about temporary speed limit changes, construction zones, and emergency situations, allowing the system to maintain both the reliability of map data and the real-time accuracy of current conditions without losing temporary change information
Solution Approach 2:
The system dynamically adjusts its speed limit information by continuously comparing map data with real-time camera detection and V2X communications. When temporary changes are detected through any source, the system dynamically updates the displayed speed limit, ensuring real-time accuracy while maintaining the structured reliability of the base map information through controlled adaptation
4Measurement precision
If the system integrates multiple data sources (camera, V2X, map), then the speed limit determination accuracy improves, but the device complexity increases
Solution Approach 1:
The patent segments the data integration process into distinct functional modules: a map data reception module, a camera image processing module, a V2X communication module, and a controller that coordinates them. Each module handles specific data sources independently, then the controller integrates the results. This segmentation allows high-speed limit determination accuracy through comprehensive data integration while managing complexity through modular architecture and clear separation of concerns
Data Source
AI summary
Provided is An apparatus for assisting driving of a host vehicle, the apparatus comprising: a camera mounted to the host vehicle and having a field of view in front of the host vehicle, the camera configured to acquire image data; and a controller including a processor configured to process the image data, and configured to receive a map on which the host vehicle travels from a server, compare a speed limit included in the map with a speed limit included in the image data, and control a display of the host vehicle so as to display the speed limit based on the image data.