Vehicle Braking Trajectory Control for Rapid Deceleration
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Solution Overview
Problem
Existing vehicle collision avoidance systems face challenges in determining optimal braking levels to prevent collisions while minimizing passenger discomfort and ensuring safe operation, particularly when sudden maximum braking can lead to increased collision risk for following vehicles and discomfort for passengers.
Innovation Solution
A trajectory determination system that dynamically adjusts braking levels based on environmental and vehicle conditions, employing normal, hard, and maximum braking strategies to ensure safe obstacle avoidance and minimize passenger discomfort by delaying the use of maximum braking until necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If maximum braking is applied to avoid obstacles, then collision avoidance capability is improved, but passenger comfort deteriorates and collision risk for following vehicles increases
Solution Approach 1:
The system dynamically adjusts braking levels based on real-time assessment of collision risk, vehicle trajectory, and environmental conditions. Instead of applying fixed maximum braking, the system modulates brake force intensity according to the specific situation, transitioning between normal, hard, and maximum braking levels as needed to balance collision avoidance with passenger comfort and safety of following vehicles.
Solution Approach 2:
The system changes the braking parameter (brake force intensity) based on calculated collision risk and trajectory analysis. By adjusting the braking level parameter dynamically - using normal braking when risk is low, hard braking when risk is moderate, and maximum braking only when collision is imminent - the system optimizes the balance between avoidance capability and minimizing harmful effects.
2Reliability
If maximum braking is applied to ensure safe stopping distance, then obstacle avoidance is improved, but vehicle control stability deteriorates
Solution Approach 1:
The system dynamically selects braking intensity based on the calculated distance to obstacle and vehicle speed. By adjusting braking force according to real-time conditions rather than applying maximum braking uniformly, the system maintains vehicle control stability while achieving appropriate stopping distances.
Solution Approach 2:
The system applies partial braking action (normal or hard braking) when sufficient to achieve safe stopping distance, reserving maximum braking for situations where it is truly necessary. This partial action approach prevents excessive braking that would compromise vehicle control stability while still ensuring adequate stopping distance.
Data Source
AI summary
Systems and techniques for determining a trajectory for use in controlling a vehicle are described. A trajectory determination system may generate a variety of trajectories for potential use in controlling a vehicle, including a maximum braking trajectory that enables the maximum application of the vehicle's brakes. A vehicle computing system may determine a distance between vehicle and an obstacle and stopping distances for the various trajectories and implement the maximum braking trajectory after determining that the distance to stop for that trajectory is the same as, but not substantially greater than, the distance between the vehicle and the obstacle.