Vehicle Risk Potential Field Control for Collision Avoidance
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Solution Overview
Problem
Existing risk avoidance control systems in vehicles often execute unnecessary or excessive steering and deceleration controls due to fixed potential field configurations, leading to discomfort for occupants and inefficiencies in collision avoidance.
Innovation Solution
A driving support system that dynamically sets a risk potential field by combining vehicle center and obstacle potential fields, allowing the vehicle to follow a valley in the risk potential field that changes with its position, thereby avoiding fixed lane center forces and optimizing steering and deceleration controls based on real-time driving environment information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fixed lane center potential field is used to maintain lane position, then lane keeping stability is improved, but unnecessary steering control is generated that is unrelated to object avoidance
Solution Approach 1:
The patent applies the Dynamics principle by making the potential field configuration dynamic rather than fixed. The lane center potential field is adjusted based on the detected object's position and the vehicle's current lane position. When an object is detected in the same lane, the potential field valley shifts from the lane center toward the vehicle's current position, allowing the steering control to be relevant to both lane keeping and object avoidance, thereby eliminating unnecessary steering actions.
2Reliability
If a fixed risk potential field is used for object avoidance, then collision risk reduction is improved, but excessive risk avoidance control is executed leading to occupant discomfort
Solution Approach 1:
The patent applies the Parameter changes principle by dynamically adjusting the parameters of the potential field based on the vehicle's position relative to the detected object. The valley position of the potential field is calculated to shift from the fixed lane center toward the vehicle's current position when an object is detected. This parameter adjustment ensures that risk avoidance control is executed only when necessary and in a manner that is relevant to the actual risk, thereby reducing excessive control actions and improving occupant comfort while maintaining collision risk reduction.
Data Source
AI summary
A driving support system executes a risk avoidance control for reducing a risk of collision with an object in front of a vehicle. A risk potential field represents a risk value as a function of position. An obstacle potential field is a risk potential field in which the risk value is maximum at a position of the object and decreases as a distance from the object increases. A vehicle center potential field is the risk potential field in which a valley of the risk value extends in a lane longitudinal direction from a position of the vehicle. A first risk potential field is the sum of the vehicle center potential field and the obstacle potential field. The driving support system executes a steering control such that the vehicle follows the first valley of the risk value represented by the first risk potential field.