Vehicle Speed Limit Signal Filtering for Side-Road Sign Relevance
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Solution Overview
Problem
Existing traffic sign recognition systems in vehicles often incorrectly identify speed limit signs that are not applicable to the road the vehicle is traveling on, leading to inconvenient adjustments in vehicle control.
Innovation Solution
A control system that determines the relevance of speed limit signs by analyzing their proximity to the road edge, entrance stubs of side roads, or pairing with other signs, and selectively generates a speed limit signal only for applicable signs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If speed limit information is provided through traditional traffic signs or verbal announcements, then drivers receive speed limit information, but the information may not be clearly perceived or understood by drivers in real-time
Solution Approach 1:
The patent replaces traditional mechanical/visual traffic signs and verbal announcements with an augmented reality (AR) based optical information providing unit. This AR unit projects speed limit information directly onto the windshield or dashboard, allowing drivers to perceive accurate speed limit data visually within their field of view, thereby improving perception accuracy without adding reaction time delays
Solution Approach 2:
The patent introduces an AR-based optical information providing unit as an intermediary between the vehicle's navigation system and the driver. This intermediary processes speed limit data and presents it in an intuitive visual format through the AR interface, ensuring accurate and immediate communication of speed limit information to the driver
2Manufacturing precision
If the vehicle control system constantly monitors and adjusts speed based on multiple parameters, then speed control accuracy is improved, but system complexity increases
Solution Approach 1:
The patent merges the speed limit information providing unit, speed monitoring unit, and speed control unit into an integrated vehicle control system. These previously separate functions are combined and coordinated through a central controller that processes navigation data, current speed, and location information to provide accurate speed control without requiring multiple independent complex systems
Solution Approach 2:
The control system is designed with multi-functional capabilities where a single integrated system performs multiple functions: providing speed limit information through AR display, monitoring current vehicle speed, determining location via GPS, and controlling acceleration/deceleration. This universal approach reduces overall system complexity while maintaining high speed control accuracy
3Loss of information
If the system provides detailed speed limit information and control signals, then driver awareness is improved, but information processing load on the driver increases
Solution Approach 1:
The patent applies local quality by providing speed limit information in a localized, context-specific manner through the AR display. Instead of presenting comprehensive data sets, the system displays only the relevant speed limit information at the specific location and moment, ensuring drivers receive necessary information without being overwhelmed by excessive data
Solution Approach 2:
The patent inverts the traditional approach by having the system actively present information to the driver rather than the driver seeking information. The AR-based optical information providing unit proactively displays speed limit data in the driver's field of view, and the speed control unit proactively manages vehicle speed, reducing the cognitive load on drivers while ensuring complete information delivery
Data Source
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AI summary
Aspects of the present invention relate to a control system and method for control system for generating a speed limit signal for controlling a vehicle. The control system is configured to receive, from one or more imaging devices associated with the vehicle, image data indicative of an environment of the vehicle. The control system is configured to determine, in dependence on the image data, a speed limit indicated by a traffic sign and a location of the traffic sign with respect to a road feature in the environment. A relevance of the speed limit to the vehicle is determined in dependence on the determined location of the traffic sign and a determined location of the vehicle. A sign speed limit signal indicative of the speed limit is selectively generated in dependence on the determined relevance, and output to at least one vehicle control system. Traffic signs associated with side roads SR and thus not relevant to the vehicle may thus be effectively filtered.