Roundabout Speed Control Using Other Vehicle Passage Time
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Solution Overview
Problem
Conventional driving assistance systems fail to control vehicle speed effectively after entering a roundabout, leading to potential traffic congestion and unsafe driving scenarios due to inconsistent speed adjustments.
Innovation Solution
A driving assistance apparatus that utilizes a front camera, GNSS, and map data to estimate the entrance width of a roundabout, calculate the passage time of other vehicles, and set a predetermined vehicle speed for smooth roundabout traversal, incorporating curvature adjustments for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle maintains decelerated speed at the time of entering the roundabout, then safety is improved, but traffic congestion occurs
Solution Approach 1:
The vehicle speed setting is dynamically adjusted based on real-time conditions within the roundabout. The system continuously monitors other vehicles' speeds and positions, then adapts the cruise control speed accordingly, transitioning from a static decelerated speed to a dynamic speed that balances safety and traffic flow efficiency.
Solution Approach 2:
The system implements feedback by detecting the speeds of other vehicles traveling in the roundabout and using this information to adjust the subject vehicle's speed. The speed detection unit continuously monitors surrounding vehicles, and this feedback loop enables the vehicle to maintain appropriate speed relative to traffic conditions, preventing both congestion and collisions.
2Productivity
If the vehicle returns to normal cruise control speed setting, then productivity is improved, but collision risk increases
Solution Approach 1:
The system uses feedback from the speed detection unit to continuously monitor other vehicles' speeds. When the subject vehicle accelerates toward normal cruise control speed, the feedback mechanism ensures it does not exceed safe distances from other vehicles, thereby maintaining both productivity and collision avoidance.
Solution Approach 2:
The system changes the speed parameter dynamically based on detected conditions. Instead of using a fixed normal cruise control speed, the system adjusts the speed parameter in real-time based on the speeds of other vehicles detected in the roundabout, enabling safe acceleration while maintaining appropriate spacing.
3Adaptability or versatility
If the driver manually controls vehicle speed, then adaptability is improved, but ease of operation deteriorates
Solution Approach 1:
The system provides self-service by automatically detecting other vehicles' speeds and adjusting the subject vehicle's cruise control speed accordingly. The driver simply needs to activate the roundabout mode, and the system handles the complex speed adjustment tasks automatically, maintaining adaptability while significantly reducing driving effort.
Solution Approach 2:
The automatic speed adjustment system uses feedback from continuous monitoring of other vehicles to autonomously manage speed changes. This feedback-driven automation provides the adaptability of manual control without requiring the driver to continuously monitor and adjust speed, thereby improving ease of operation.
Data Source
AI summary
The driving assistance apparatus includes an entrance width acquisition unit configured to acquire an entrance width of a roundabout in front of the vehicle based on an image captured by a front camera of the vehicle, or position information and map information of the vehicle, an other vehicle passage time calculation unit configured to calculate a passage time when another vehicle traveling in the roundabout passes the entrance width based on the image captured by the front camera of the vehicle, a vehicle speed estimation unit configured to estimate a vehicle speed of the other vehicle based on the entrance width and the passage time, and a vehicle speed setting unit configured to set a set vehicle speed for roundabout traveling based on the vehicle speed of the other vehicle.