GPS Speed Limit Control System for Vehicle Adaptability
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Solution Overview
Problem
Existing vehicle speed limiting and controlling systems are complex and costly, as they rely on camera-based speed limit sign recognition, and conventional GPS navigation devices do not actively control vehicle speed, failing to adapt to varying safe speed requirements based on location.
Innovation Solution
A vehicle speed limiting and controlling system that uses a GPS receiver to determine the posted speed limit and an actual speed sensor to adjust the vehicle's speed, with a controller generating alarms or actuating speed control mechanisms to ensure compliance with the lower of the preset or posted speed limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a camera-based speed limit sign recognition system is used to adapt speed limits to location, then the system can respond to varying operating environments, but the device complexity and cost increase significantly
Solution Approach 1:
The patent uses GPS satellite signals as an intermediary to obtain speed limit information without requiring direct visual recognition of speed limit signs. The GPS receiver receives signals containing location and speed limit data, which are then processed by the controller to determine appropriate speed limits, eliminating the need for complex camera and image processing systems
Solution Approach 2:
The patent replaces the mechanical/optical system of camera-based sign recognition with an electronic signal processing system using GPS receivers and electronic controllers. This substitution eliminates the need for physical cameras, optical lenses, and complex image processing hardware, reducing device complexity while maintaining adaptability
2Loss of information
If GPS navigation devices display posted speed limits and generate alarms, then the system provides location-based speed information, but the system does not affirmatively control vehicle speed
Solution Approach 1:
The patent implements a feedback control system where the electronic controller continuously receives actual vehicle speed from the speed sensor, compares it with the posted speed limit obtained from GPS signals, and generates control signals to the speed control device when the vehicle exceeds the speed limit. This closed-loop feedback mechanism enables automatic speed control rather than merely displaying information
Solution Approach 2:
The system enables the vehicle to self-regulate its speed through automatic control. The electronic controller autonomously monitors speed, retrieves speed limit information from GPS signals, and actuates the speed control device without requiring driver intervention, allowing the vehicle to service its own speed compliance needs
3Device complexity
If a single predetermined maximum speed is set for speed limiting, then the system is simple to implement, but it cannot adapt to different locations with varying safe speed requirements
Solution Approach 1:
The patent transforms the static, fixed speed limit into a dynamic parameter that automatically adjusts based on vehicle location. The GPS receiver continuously provides updated location information, and the controller dynamically determines the appropriate speed limit for the current location, allowing the speed limit to change as the vehicle moves through different geographic areas with different speed requirements
Data Source
AI summary
A system includes a GPS receiver that generates a signal that is representative of a posted speed limit at a location where a vehicle is located and a device that generates a signal that is representative of an actual speed of the vehicle. A controller is responsive to the GPS receiver signal and the actual speed sensor signal for either (1) generating an alarm or (2) limiting or otherwise controlling the speed of the vehicle when the actual speed of the vehicle is greater than the posted speed limit.