Vehicle Speed Control System Using Navigation Limits
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Solution Overview
Problem
Traffic accidents are prevalent due to excessive vehicle speeds, and existing technologies lack effective methods to consistently enforce speed limits, particularly in real-time and dynamic road conditions.
Innovation Solution
A vehicle control system incorporating a secure controlling system that utilizes a GPS navigation system, speed sensors, and a fuel controller to monitor and adjust vehicle speed by calculating the time required to slow down based on distance and speed limits, either by reducing fuel supply or prompting the driver to apply the brakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vehicle travels at high speed to improve productivity, then the driving time is reduced, but the risk of traffic accidents increases due to excessive speed
Solution Approach 1:
The system continuously monitors the vehicle's current speed via speed sensors and compares it with the speed limit obtained from the navigation system. When the current speed exceeds the speed limit, the system provides feedback to the driver through visual and audible warnings, creating a closed-loop control system that dynamically adjusts driver behavior to maintain safe speeds.
Solution Approach 2:
The navigation system pre-obtains speed limit information for upcoming road sections before the vehicle reaches them. This allows the system to prepare speed limit data in advance, enabling timely warnings and speed adjustments before the vehicle enters restricted zones, rather than reacting after exceeding the limit.
2Reliability
If automated speed control systems are implemented to enforce speed limits, then traffic safety is improved, but the device complexity increases due to multiple sensors and control components
Solution Approach 1:
The control device integrates multiple functions into a single unit: it receives speed limit data from the navigation system, monitors current speed via speed sensors, calculates speed violations, generates visual and audible warnings, and controls the fuel injector to adjust vehicle speed. This multi-functional integration reduces the need for separate dedicated components for each function.
Solution Approach 2:
The system combines the navigation system's route planning capabilities with speed limit enforcement functions. The same control device that manages fuel injection for engine control also handles speed monitoring and warning generation, merging multiple safety and control functions into a unified system rather than adding separate independent systems.
3Reliability
If real-time speed monitoring and control is implemented to reduce accidents, then traffic safety is improved, but the response time required for speed adjustment increases due to calculation and control delays
Solution Approach 1:
The system pre-calculates the time required for speed adjustment by dividing the distance to the speed limit enforcement point by the current speed. This preliminary calculation allows the system to determine in advance how much time is needed to slow down before reaching the restricted zone, enabling proactive speed adjustment rather than reactive braking.
Solution Approach 2:
The control system dynamically adjusts the fuel injector's operation based on real-time conditions. Instead of using fixed timing, the system continuously monitors current speed and distance to the enforcement point, then adaptively controls the fuel supply to achieve the required speed reduction within the calculated time window, optimizing the response for each specific situation.
Data Source
AI summary
A speed controlling method for a vehicle comprises obtaining a driving speed limit of a road ahead from a navigation system of the vehicle. A current driving speed of the vehicle is detected and if the current driving speed of the vehicle is greater than the limit ahead, a driver of the vehicle is informed that he must slow down in a distance between the vehicle and a speed measuring device located on the road ahead.