Adaptive Deceleration Control for Vehicle Stability Under Collision Risk
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Solution Overview
Problem
Existing driver assistance systems may cause vehicle instability when decelerating due to high collision risk, leading to uncomfortable and potentially unsafe driving experiences.
Innovation Solution
A driver assistance device that automatically decelerates a vehicle based on its relative position to a leading vehicle, adjusting deceleration by varying amounts and estimating potential instability, thereby changing deceleration strategies to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relatively large jerk is applied to decelerate the own vehicle when collision risk is high, then the deceleration response is faster and collision risk is reduced, but the vehicle behavior becomes unstable
Solution Approach 1:
The patent applies dynamics by making the jerk value adjustable based on vehicle state. The control unit determines whether to apply a first jerk (larger magnitude) or second jerk (smaller magnitude) based on real-time assessment of vehicle behavior stability. This dynamic adjustment allows the system to optimize between rapid collision avoidance and maintaining vehicle stability according to current conditions.
Solution Approach 2:
The patent changes the jerk parameter based on vehicle state assessment. When the vehicle is determined to be in a state where behavior stability is not compromised, a larger jerk is applied for faster deceleration. When stability concerns are detected, a smaller jerk is applied. This parameter change strategy resolves the contradiction by adapting the deceleration aggressiveness to current vehicle conditions.
2Stability of the object's composition
If a smaller jerk is applied to maintain vehicle stability during deceleration, then vehicle behavior remains stable, but the deceleration response is slower and collision risk increases
Solution Approach 1:
The system dynamically selects between two jerk strategies based on real-time vehicle state assessment. When collision risk is high but vehicle stability allows, the larger jerk is applied for rapid response. When stability is compromised, the smaller jerk is applied. This dynamic selection resolves the contradiction by optimizing the trade-off between response speed and stability based on current conditions.
Solution Approach 2:
The control unit changes the jerk parameter magnitude based on assessed vehicle state and collision risk level. The system monitors whether the vehicle can tolerate larger deceleration forces without becoming unstable, and adjusts the jerk parameter accordingly. This adaptive parameter change allows the system to achieve both rapid collision avoidance and stability maintenance when conditions permit.
Data Source
AI summary
A driver assistance device includes a processor. The processor is configured to: automatically decelerate an own vehicle in accordance with a relative relation between the own vehicle and a vehicle traveling ahead that is traveling forward of the own vehicle; change deceleration of the own vehicle by a first change amount, or a second change amount that is larger than the first change amount, when automatically decelerating the own vehicle; perform behavioral determination to estimate whether behavior of the own vehicle will become unstable when the own vehicle is automatically decelerated; and change the deceleration by the first change amount when automatically decelerating the own vehicle, when the behavior of the own vehicle is estimated to become unstable.