Dynamic Forward Collision Warning Threshold Adjustment
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Solution Overview
Problem
Conventional driver assistance systems for vehicles rely on fixed time-to-impact thresholds for initiating warnings or evasive actions, which do not account for changes in vehicle parameters and environmental conditions, leading to insufficient or unnecessary warnings due to varying maneuverability.
Innovation Solution
A system that dynamically updates the time-to-impact threshold based on real-time monitoring of vehicle loading, braking performance, steering ability, and traction conditions using sensors and monitors, adjusting the threshold to reflect actual driving conditions and enhance maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed time-to-impact threshold is used for collision warning, then the system provides sufficient opportunity for driver reaction under normal conditions, but the warning may be insufficient or unnecessary when vehicle maneuverability changes due to aging, weather, or road conditions
Solution Approach 1:
The patent applies the Dynamics principle by transitioning from a fixed time-to-impact threshold to a dynamic threshold that automatically adjusts based on real-time vehicle performance parameters. The system continuously monitors braking performance, steering response, and vehicle mass changes, then modifies the threshold accordingly to maintain optimal collision warning reliability under varying conditions.
Solution Approach 2:
The patent implements the Feedback principle by creating a closed-loop system where vehicle performance is continuously monitored through sensors, the time-to-impact threshold is adjusted based on detected performance degradation or environmental changes, and the system responds to actual driving conditions. This feedback mechanism ensures the warning system adapts to aging vehicles, weather changes, and road surface variations.
2Duration of action of moving object
If the time-to-impact threshold is increased to account for unfavorable conditions, then the warning provides more time for evasive action, but unnecessary warnings may be generated under normal conditions
Solution Approach 1:
The patent applies the Parameter changes principle by dynamically adjusting the time-to-impact threshold parameter based on actual vehicle performance parameters rather than using a fixed conservative value. The system monitors specific parameters such as braking deceleration, steering angle response, and vehicle mass, then modifies the threshold parameter to match current capabilities, avoiding both insufficient and excessive warning times.
3Adaptability or versatility
If the threshold is adjusted dynamically based on vehicle conditions, then the system adapts to actual maneuverability, but the device complexity increases due to additional sensors and monitoring systems
Solution Approach 1:
The patent applies the Universality principle by designing a system where existing vehicle sensors serve multiple functions. The same sensors used for basic vehicle operation and diagnostics are utilized to monitor performance parameters for threshold adjustment, eliminating the need for entirely separate monitoring systems and reducing overall complexity.
Data Source
AI summary
A driver assistance system for a motor vehicle monitors approaching objects around the vehicle in order to take a driver assistance action in response to a predicted impact with an approaching object according to a time-to-impact threshold. the time-to-impact threshold includes a nominal or default value that is adjusted according to several different measures of vehicle and driving conditions. Respective offsets determined by a load monitor, a braking monitor, and a steering monitor are added to the threshold in response to measured vehicle performance parameters being different from expected values. The driver assistance action may be a perceptible warning for a forward collision warning system, a speed reduction in an adaptive cruise control system, or a braking action in a brake-steer system.