Vehicle Speed Control at Geofenced Borders
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Solution Overview
Problem
Existing systems fail to effectively regulate vehicle speed as it approaches and crosses a geofenced border, potentially leading to unsafe speeds within designated areas.
Innovation Solution
A method and system that define speed boundaries within a geographic region, using GPS and processor calculations to determine vehicle velocity and distance from the border, and apply deceleration through fuel reduction or braking to ensure the vehicle reaches the desired speed when crossing the border.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle continues at its current speed without regulation, then the vehicle maintains its cruising speed and efficiency, but the vehicle may exceed safe speed limits when entering the geofenced area
Solution Approach 1:
The system performs preliminary speed regulation by calculating the required deceleration before the vehicle reaches the border. The controller determines the exact point where braking should begin based on the vehicle's current speed, border speed limit, and distance to the border, ensuring the vehicle arrives at the border at the correct speed without excessive braking or early deceleration.
Solution Approach 2:
The system continuously monitors the vehicle's speed, position, and distance to the border using GPS and speed sensors. This feedback loop allows the controller to adjust the braking action in real-time, ensuring the vehicle reaches the border at the precise speed required while minimizing unnecessary energy loss.
2Reliability
If the vehicle is decelerated early to ensure border speed compliance, then the vehicle will meet speed limits at the border, but the vehicle loses time and energy before reaching the border
Solution Approach 1:
The system calculates the optimal deceleration point in advance by considering the vehicle's current speed, the border speed limit, and the distance to the border. This preliminary calculation ensures that braking begins at the precise moment needed, avoiding both early deceleration (which wastes time) and late braking (which risks speed non-compliance).
Solution Approach 2:
The system dynamically adjusts the deceleration strategy based on real-time vehicle conditions and position. Rather than using a fixed deceleration schedule, the controller continuously updates the braking command based on the vehicle's actual speed and distance to the border, optimizing the balance between speed compliance and time efficiency.
3Reliability
If the vehicle is decelerated sharply to meet border speed requirements, then the vehicle achieves speed compliance, but the passenger comfort and vehicle stability deteriorate
Solution Approach 1:
The system applies dynamic braking control that adjusts the deceleration rate in real-time. Rather than applying a fixed sharp brake, the controller modulates the braking force to achieve a smooth, progressive deceleration that maintains passenger comfort while ensuring the vehicle reaches the border at the correct speed. The braking profile is continuously optimized based on the vehicle's position and speed.
Solution Approach 2:
The system initiates deceleration in advance at a calculated optimal point, allowing the vehicle to reduce speed gradually rather than applying sharp brakes at the last moment. This preliminary, controlled deceleration maintains both speed compliance and passenger comfort by avoiding sudden braking maneuvers.
4Device complexity
If no speed regulation system is implemented, then the system complexity remains low, but the vehicle may unsafe speeds within the geofenced area
Solution Approach 1:
The system utilizes existing vehicle components (GPS receiver, speed sensor, and brake system) for speed regulation, rather than requiring entirely new hardware. The controller integrates these existing elements to perform the additional function of border speed compliance, minimizing added complexity while ensuring safety.
Solution Approach 2:
The system employs a feedback mechanism that continuously monitors the vehicle's speed and position and automatically adjusts braking to maintain compliance. This closed-loop control ensures reliability through automatic correction rather than requiring complex manual intervention systems, achieving safety through simple, responsive feedback-based control.
Data Source
AI summary
A system for regulating the speed of a vehicle includes defining a first border for a first geographic region. The border has a first speed within the border and a second speed outside of the border. The system includes determining a first velocity of the vehicle including a vehicle speed and direction of the vehicle approaching the border. The difference between the vehicle speed and the second speed is the calculated, as is a distance between the vehicle and the border. If the difference between the vehicle speed and the second speed divided by the distance is greater than a predetermined value, the vehicle is decelerated at a rate so that the vehicle will have a second speed when the vehicle reaches the border.