Driver Assistance Width Guidance for Off-Tracking in Narrow Roads
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Solution Overview
Problem
Advanced driver assistance systems (ADAS) face challenges with off-tracking, where the rearmost vehicle axle follows a path significantly different from the front steering axle, especially in narrow situations, leading to potential collisions.
Innovation Solution
A computer system determines a vehicle's maximum width based on actual dimensions and road characteristics, providing visual information to the driver through head-up displays or projected lights, guiding the vehicle along a suggested trajectory to prevent off-tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a suggested trajectory is provided to guide the driver, then lateral positioning accuracy is improved, but off-tracking causes the vehicle to require another route to avoid collision
Solution Approach 1:
The system calculates and displays the maximum width trajectory in advance before the vehicle reaches critical narrow sections. This allows the driver to see the required path ahead and adjust positioning proactively, rather than reacting to immediate collision risks. The maximum width trajectory is computed based on upcoming road geometry and vehicle dimensions, enabling preventive positioning adjustments.
Solution Approach 2:
The system transitions from displaying only the central trajectory (one-dimensional guidance) to displaying both the central trajectory and the maximum width trajectory (two-dimensional guidance envelope). This dimensional expansion provides the driver with spatial boundaries showing the full extent of vehicle movement, enabling better lateral positioning decisions that account for off-tracking effects.
2Reliability
If the system displays maximum width information, then collision risk is reduced, but the device complexity increases
Solution Approach 1:
The system uses the existing trajectory calculation functionality to compute both the central trajectory and the maximum width trajectory. By reusing the same computational engine and data structures for different purposes (central path guidance and width envelope calculation), the system avoids duplicating complex algorithms and reduces overall system complexity while still providing enhanced safety information.
Solution Approach 2:
The maximum width trajectory acts as an intermediary visual element between the central trajectory and the physical vehicle boundaries. Rather than directly computing and displaying complex vehicle corner paths or using multiple sensors, the system introduces this intermediate maximum width envelope that simplifies the visualization while conveying essential spatial information for collision avoidance.
Data Source
AI summary
A computer system is provided. The computer system comprises a processor device configured to receive map data representing characteristics of a road ahead of a vehicle, the vehicle having an actual vehicle width and an actual vehicle length; determine a maximum width of the vehicle based on at least the actual vehicle width and the map data; and provide visual information representing the maximum width to a driver of the vehicle.