Speed Limit Alert Logic for Ramp and Auxiliary Road Recognition
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Solution Overview
Problem
Intelligent vehicles face challenges in accurately recognizing speed limits in complex scenarios, such as ramps or urban main and auxiliary roads, leading to incorrect speed limit selection and reduced accuracy.
Innovation Solution
The intelligent driving device employs sensors to obtain information about speed limit signs, including position and features, and determines the type of road (main, ramp, or auxiliary) based on road information, using navigation data and relative distances to accurately alert users to the correct speed limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the traffic sign recognition system uses a camera to recognize speed limit signs in complex scenarios, then the system can provide speed limit alerts, but the system is prone to recognize speed limits that do not belong to the current lane, resulting in speed limit mis-selection and reduced accuracy
Solution Approach 1:
The patent introduces road type information (main road, ramp, auxiliary road) as an intermediary element to mediate between the camera recognition system and the speed limit alert system. By classifying the current road type and comparing it with the road type associated with the recognized speed limit sign, the system determines whether to issue an alert, thereby preventing mis-selection of speed limits in complex scenarios without requiring complex additional hardware
Solution Approach 2:
The patent performs preliminary classification of the current road type before issuing speed limit alerts. The system first determines whether the vehicle is on a main road, ramp, or auxiliary road, and pre-loads the corresponding speed limit information for that road type. This preliminary action enables the system to quickly compare and validate recognized speed limit signs against the appropriate road type, improving recognition accuracy while maintaining simple system architecture
2Measurement precision
If the system alerts users to speed limit values in all scenarios, then comprehensive speed limit information is provided, but incorrect speed limit alerts are given in complex scenarios such as ramps and auxiliary roads
Solution Approach 1:
The patent applies different alerting strategies based on local road type characteristics. For main roads, the system provides comprehensive speed limit alerts; for ramps and auxiliary roads, the system selectively suppresses alerts when the recognized speed limit does not match the expected road type. This localized quality approach ensures high precision in speed limit value accuracy while maintaining adaptability across different scenario types
3Reliability
If the system suppresses speed limit alerts in complex scenarios to avoid incorrect information, then false alerts are reduced, but legitimate speed limit information may be missed
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously compares the road type of the currently recognized speed limit sign with the pre-determined road type of the vehicle's current location. When the road types match, the system issues an alert; when they differ, the system suppresses the alert. This feedback loop ensures high alert accuracy by validating each speed limit recognition against the appropriate road type context, while maintaining information completeness by only suppressing alerts that are genuinely incorrect
Data Source
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AI summary
A warning method and apparatus, and an intelligent driving device are provided. The warning method includes: obtaining information about a speed limit sign, where the information about the speed limit sign indicates that the speed limit sign is a ramp speed limit sign or an auxiliary road speed limit sign (S301); and determining, based on road information of a first lane on which the intelligent driving device is located and the information about the speed limit sign, whether to alert a user to a speed limit value corresponding to the speed limit sign (S302), where the road information of the first lane indicates that the first lane is a main road, a ramp, or an auxiliary road. According to the warning method, incorrect speed limit selection in a complex scenario can be avoided, and accuracy of recognizing a speed limit value by the driving device is improved.