Vehicle Speed Controller Dynamic Threshold Logic
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Solution Overview
Problem
Current vehicle speed warning and regulation systems incorrectly apply lower speed limits in school zones during non-active hours and fail to differentiate between multiple speed limits, leading to unnecessary warnings and speed adjustments.
Innovation Solution
A controller that evaluates images of speed limit signs to dynamically determine if the posted speed limit is above a predetermined threshold, setting it as a warning threshold only if applicable, and transmits warnings and adjusts speed only when the vehicle exceeds this threshold, thereby avoiding unnecessary warnings and speed adjustments during non-active school hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system always applies the lower speed limit when multiple speed limits are detected, then safety is improved by ensuring speed limits are not exceeded, but false warnings and unnecessary speed adjustments occur during non-active hours
Solution Approach 1:
The system dynamically adjusts the warning threshold based on the detected speed limit value. When a speed limit of 25 mph or higher is detected, the warning threshold is set to that speed limit. When a speed limit below 25 mph is detected (indicating non-active school hours), no warning threshold is set. This dynamic adjustment resolves the contradiction by making the system responsive to the actual operational status of speed limits.
2Reliability
If the system warns and controls speed for all detected speed limits, then comprehensive speed regulation is achieved, but operational efficiency decreases due to unnecessary warnings during non-active hours
Solution Approach 1:
The system changes the operational parameter (warning threshold) based on the detected speed limit value. By comparing the detected speed limit against a predetermined threshold of 25 mph, the system selectively applies speed regulation only when appropriate, thereby maintaining compliance while improving operational efficiency by eliminating unnecessary warnings.
3Measurement precision
If the system sets warning threshold based on detected speed limit, then accurate speed regulation is achieved, but unnecessary warnings occur when speed limit is not actively in effect
Solution Approach 1:
The system maintains continuous monitoring of speed limits but applies warning actions selectively. By continuously detecting speed limits and comparing them against the 25 mph threshold, the system ensures accurate identification while avoiding unnecessary warnings during non-active hours, thus maintaining useful action continuity without generating harmful false alarms.
Data Source
AI summary
A controller is adapted to receive signals indicative of an image including a representation of a posted speed limit for a current section of a road on which an associated vehicle is traveling. The controller evaluates the image to identify the posted speed limit and dynamically determines if the posted speed limit is above a predetermined threshold speed limit. Only if the posted speed limit is above the predetermined threshold speed limit, the controller sets the identified posted speed limit as a warning threshold. If a speed of the associated vehicle is more than a predetermined range over the warning threshold, the controller transmits a warning signal to a notifier for notifying an operator of the associated vehicle and controls a speed of the vehicle based on the posted speed limit.