Adaptive Automatic Braking via Collision Confidence
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Solution Overview
Problem
Existing driver assistance systems for vehicles lack an efficient method to determine the optimal deceleration strategy based on the probability of a collision, which can lead to either unnecessary braking or insufficient response, particularly in scenarios with varying collision confidence levels.
Innovation Solution
An automatic braking system that uses a controller to monitor vehicle motion and detect objects with sensors, calculating a collision confidence value to determine a velocity profile for deceleration, where the deceleration is inversely proportional to the collision confidence value, allowing for adaptive braking maneuvers to prevent collisions while minimizing driver intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic braking is activated with high sensitivity to detect potential collisions, then collision avoidance capability is improved, but driver intrusion and unnecessary braking increases
Solution Approach 1:
The system dynamically adjusts the deceleration parameter based on the collision confidence value. When collision confidence is high, the system applies stronger deceleration forces; when confidence is low, deceleration is minimized or avoided. This parameter adaptation allows the system to maintain high collision avoidance capability while reducing unnecessary braking that would cause driver intrusion.
Solution Approach 2:
The braking system transitions from a static, fixed-response approach to a dynamic, adaptive response based on real-time collision confidence assessment. The controller continuously monitors sensor data and adjusts the braking force dynamically, applying brakes only when the calculated collision confidence exceeds predetermined thresholds, thereby balancing safety with driver comfort.
2Reliability
If deceleration is applied early at greater distances from the object, then collision avoidance is improved, but driver comfort deteriorates due to sudden braking
Solution Approach 1:
The system adjusts the deceleration parameter based on the collision confidence value and distance to the object. When the object is detected at a greater distance with low collision confidence, the system applies minimal or no deceleration. When the object approaches and collision confidence increases, the system progressively increases deceleration force, ensuring timely collision avoidance while minimizing unnecessary early braking that would cause driver discomfort.
Solution Approach 2:
The system performs preliminary assessment of collision risk using sensor data and confidence calculations before initiating braking. By evaluating collision confidence in advance and only triggering deceleration when thresholds are met, the system prepares for potential collision avoidance without committing to premature braking actions that would disrupt driver comfort.
3Reliability
If braking force is increased to ensure collision avoidance, then safety is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts the braking force parameter based on the calculated collision confidence value. Instead of applying maximum braking force in all potential collision scenarios, the system scales the deceleration force proportionally to the assessed risk level. This parameter adaptation ensures adequate braking energy is consumed only when collision confidence is high, while minimizing energy waste in low-risk situations.
Data Source
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AI summary
An automatic braking system (12) for a vehicle (10) includes an electronic brake system (16) capable of applying wheel brakes (20) to decelerate the vehicle and a controller. The controller includes instructions for detecting an object proximate to a vehicle with at least one sensor (30, 36) for a reverse collision avoidance system (14) and determining a collision confidence value based upon the probability of collision with the object. The controller further includes instructions for determining a desired velocity profile of the vehicle that provides for deceleration of the vehicle.