Emergency Braking System Dynamic Safe Tracking Distance
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Solution Overview
Problem
Current advanced emergency braking systems (AEBS) lack a comprehensive method for calculating the optimal timing and duration of warning and braking phases to effectively prevent collisions, particularly in scenarios where the driver is distracted or fails to respond to impending hazards.
Innovation Solution
An emergency braking system that calculates the safe tracking distance by synchronizing the speeds of the ego vehicle and the vehicle in front using six different equations, triggering the braking sequence when the distance between them falls below this threshold, and implementing a three-stage braking process involving audible warnings, haptic warnings, and full braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the braking sequence is initiated based on fixed distance thresholds, then the system is simple to operate, but it cannot adapt to varying vehicle speeds and distances to the lead vehicle, reducing braking effectiveness
Solution Approach 1:
The patent applies dynamics by making the safe tracking distance a dynamic value that changes based on vehicle speed and distance to the lead vehicle. Instead of using fixed thresholds, the system continuously calculates the safe tracking distance using the formula that incorporates current speed (v) and distance to lead vehicle (d), allowing the braking initiation threshold to adapt dynamically to current driving conditions
Solution Approach 2:
The patent changes the parameter of safe tracking distance from a fixed value to a variable that depends on speed and distance parameters. By using the formula d_safe = v²/(2a) + d - v*t, the system transforms static distance thresholds into dynamic parameters that automatically adjust based on real-time vehicle state, improving adaptability without requiring complex manual configuration
2Reliability
If the system waits for driver response before braking, then energy consumption is reduced, but collision prevention effectiveness decreases when driver response is delayed
Solution Approach 1:
The patent implements preliminary action by calculating and preparing the safe tracking distance in advance based on current vehicle state, so that when the actual distance falls below this pre-calculated threshold, braking can be initiated immediately without waiting for driver response. The system proactively determines the safe distance using the formula before a collision risk actually materializes
Solution Approach 2:
The patent uses feedback by continuously monitoring the actual distance to the lead vehicle and comparing it against the dynamically calculated safe tracking distance. This closed-loop feedback mechanism triggers automatic braking when the threshold is breached, eliminating reliance on driver response time and ensuring collision prevention based on objective safety margins
3Adaptability or versatility
If the braking distance is calculated using a single equation, then the calculation is simple and fast, but it cannot account for different driving scenarios and speed conditions
Solution Approach 1:
The patent achieves universality by creating a single comprehensive calculation formula that handles multiple driving scenarios. The formula d_safe = v²/(2a) + d - v*t integrates both speed-dependent stopping distance (v²/2a) and distance-to-lead-vehicle considerations (d - v*t), making one equation that serves multiple functions across different driving conditions rather than requiring separate equations for different scenarios
Data Source
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AI summary
An automatic emergency braking system (1) that continuously evaluates collision risk, and an a method (100) that calculates the point in time to trigger the emergency braking system that is made of three warning, and braking phases in case collision with a lead vehicle is detected to be imminent.