Adaptive Cruise Control Speed Determination Using Vehicle Flow Mediation
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Solution Overview
Problem
Existing driving assistance systems face errors in determining the maximum authorized speed due to contradictory information from geolocation navigation systems and cameras, leading to potential inaccuracies in speed regulation.
Innovation Solution
A method that utilizes three data sources - cartographic data from navigation systems, speed limit sign detection from cameras, and environmental vehicle speed measurements - to determine the maximum authorized speed, allowing for choosing between inconsistent camera and map data sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the speed regulation system uses both camera-based speed limit detection and map-based speed limit information, then the system can provide earlier speed limit information through map data, but contradictory information from the two sources leads to errors in determining the maximum authorized speed
Solution Approach 1:
The patent introduces a third data source (surrounding vehicle speed measurements) as an intermediary to resolve conflicts between camera and map data. When camera and map data disagree, the system uses surrounding vehicle speed information as a mediator to determine which source is more reliable in the current context, thereby maintaining both early detection capability and determination accuracy.
Solution Approach 2:
The system implements feedback by continuously monitoring surrounding vehicle speeds and using this information to validate and correct speed limit determinations from camera and map sources. The measured speeds of surrounding vehicles provide feedback that helps identify erroneous data from either camera or map sources, enabling the system to self-correct and maintain high reliability.
2Measurement precision
If the system prioritizes camera-based speed limit detection over map data, then the accuracy of speed limit determination improves, but the system loses the advantage of earlier speed limit information provided by map data
Solution Approach 1:
The system performs preliminary action by using map data to provide advance notice of upcoming speed limits before they are detected by the camera. This allows the system to prepare for speed limit changes in advance while maintaining the ability to verify and correct the information when the camera detects the actual speed limit sign, thus combining both early detection and high accuracy.
Solution Approach 2:
The system dynamically adjusts its reliance on different data sources based on the situation. When map data and camera data agree, the system can use map data for early preparation. When they disagree, the system dynamically switches to using surrounding vehicle speed measurements to determine which source is correct, allowing flexible adaptation to maintain both early detection and accuracy.
3Measurement precision
If the system uses multiple data sources to determine maximum authorized speed, then the accuracy of speed regulation improves, but the complexity of the speed regulation system increases
Solution Approach 1:
The patent segments the speed limit determination process into distinct functional modules: camera-based detection, map-based information retrieval, and surrounding vehicle speed measurement. Each module operates independently and contributes specific information to the overall determination, making the complex system more manageable and maintainable while achieving high accuracy through the combination of segmented data sources.
Data Source
Figure 1~2
AI summary
The invention relates to a method for determining the maximum authorised speed applicable to a motor vehicle, hereinafter the host vehicle (1), the method comprising the steps of: - determining a first limit speed on the basis of the cartographic data from a navigation system fitted in the host vehicle (1); - determining a second limit speed on the basis of the detection of speed limit signs on the images provided by a camera fitted in the host vehicle (1); - determining a third limit speed on the basis of the measurement of the speed of the vehicles located in the environment of the host vehicle (1); - determining the maximum authorised speed applicable to the host vehicle (1), said maximum speed being equal to the first limit speed or the second limit speed, the third limit speed being used to choose between the first and the second limit speeds when said two speeds are different.