Vehicle Steering Control for Obstacle-Aware Lane Departure
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Solution Overview
Problem
Current lane departure avoidance systems do not effectively account for lateral obstacles, leading to frequent activations that annoy drivers and reduce the system's effectiveness in preventing accidents, as they primarily focus on intentional lane changes and do not intervene in cases of unintentional lane departure.
Innovation Solution
A system that uses sensors and cameras to detect lateral obstacles and calculate their position and speed, determining the maximum lateral distance available for vehicle movement, and adjusts the steering to prevent collisions by generating correction requests based on vehicle position and obstacle data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lane departure avoidance system activates frequently to correct any lane departure, then the vehicle path correction is improved, but the driver acceptance deteriorates due to annoyance and perceived unnecessary interventions
Solution Approach 1:
The system dynamically changes the activation parameters by introducing obstacle distance thresholds. Instead of activating for any lane departure, the system only activates when lane departure is detected AND no obstacles are present within a safe lateral distance. This parameter-based filtering reduces unnecessary activations while maintaining reliable correction when truly needed.
Solution Approach 2:
The system introduces an intermediary obstacle detection and evaluation layer between the lane departure detection and the steering correction. This intermediary layer assesses the safety of correction by checking for obstacles, acting as a mediator that prevents direct activation when conditions are unsafe, thereby improving both reliability and driver acceptance.
2Device complexity
If the system does not account for lateral obstacles, then the system complexity is reduced, but the collision avoidance capability deteriorates
Solution Approach 1:
The system achieves multi-functionality by using the existing lane departure detection infrastructure to serve dual purposes: traditional lane keeping and obstacle-aware collision avoidance. By overlaying obstacle detection data on top of the existing lane departure logic, the system gains collision avoidance capability without completely redesigning the core lane keeping functionality.
Solution Approach 2:
The system performs preliminary obstacle detection and safety assessment before executing lane correction maneuvers. By checking for obstacles in advance and only permitting corrections when safe, the system ensures collision avoidance capability is built into the decision-making process before the actual steering action occurs.
3Reliability
If the system intervenes in all lane departure cases, then the collision prevention is improved, but the driver control deteriorates due to unwanted steering adjustments
Solution Approach 1:
The system changes the intervention parameters by introducing conditional thresholds based on obstacle presence and distance. Instead of uniform intervention for all lane departures, the system adjusts its intervention behavior dynamically based on the measured distance to obstacles, permitting driver control when obstacles are present while maintaining collision prevention when the path is clear.
Data Source
AI summary
A system controls steering of a motor vehicle in case of an imminent collision with an obstacle. The vehicle includes a system to locate the vehicle relative to its lane and to determine a lateral deviation from the lane center, a determination unit for determining the presence of obstacles, a gyrometer for measuring the rotation speed of the vehicle, and a steering device, the steering angle of which can be controlled based on the measurement of a steering angle sensor or the steering torque of which can be controlled. The control system includes a perception device for determining the maximum lateral distance available for movement of the vehicle relative to obstacles, a decision device for transmitting a correction request based on the trajectory of the vehicle and on the lateral maximum distance, and an intervention device for controlling the steering device to correct the trajectory of the vehicle.