Collision Avoidance System Trajectory Planning
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Solution Overview
Problem
Conventional driver assistance systems for collision avoidance either issue unnecessary warnings or unjustified interventions in the steering system, leading to driver distrust and reduced system usage.
Innovation Solution
A driver assistance system that uses a proximity sensor and computer unit to detect obstacles and calculate both a first and second evasive trajectory, only intervening in the steering when the second evasive trajectory is no longer viable, ensuring timely and necessary intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the driver assistance system issues warnings early, then the driver has sufficient time to react, but the probability of unjustified warnings increases and driver trust decreases
Solution Approach 1:
The system performs preliminary calculations of multiple evasive trajectories and their feasibility before issuing warnings or interventions. By pre-calculating whether valid evasive trajectories exist at future time points, the system can issue early warnings with high confidence that they are justified, resolving the contradiction between early warning and justification accuracy.
2Reliability
If the system searches for multiple evasive trajectories, then intervention certainty increases, but computational complexity and processing time increase
Solution Approach 1:
The system segments the evaluation process by checking trajectories at discrete future time points rather than continuously. This segmentation allows the system to evaluate multiple trajectories efficiently by dividing the time horizon into evaluation points, maintaining high intervention certainty while reducing computational complexity through structured, discrete evaluation.
Data Source
AI summary
A driver assistance system for collision avoidance includes an environmental sensor for detecting an obstacle on an anticipated trajectory of a vehicle. A computing unit searches for a first evasion trajectory on which the obstacle is collision-free and for a second evasion trajectory which is transmitted from the probable trajectory and on which the obstacle can be traversed without collision. A steering system is controllable by a computing unit to steer the vehicle along one of the evasion trajectories. The computing unit is arranged to steer the steering system only and to steer the vehicle along the first evasion trajectory when the search for the second evasion trajectory is unsuccessful.