Vehicle Collision Avoidance Using Dynamic TTC Warning Zones
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Solution Overview
Problem
Existing anti-collision systems in vehicles have limitations in seamless operation across various relative speeds and time-to-collision (TTC) ranges, leading to gaps in safety measures, particularly at low relative speeds and when ACC systems are turned off.
Innovation Solution
Implementing a method that dynamically adjusts safety zones based on TTC thresholds, issuing haptic warnings and applying emergency braking when the TTC falls below specified thresholds, using a combination of brake and drive system interventions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static zoning is used for anti-collision system, then system complexity is reduced, but safety coverage is insufficient at low relative speeds and when ACC is turned off
Solution Approach 1:
The patent implements dynamic zoning where the distance warning zone and emergency braking zone are no longer fixed static boundaries, but are continuously adjusted based on real-time relative speed between vehicles. The electronic processing unit calculates dynamic zone boundaries using relative speed data, ensuring that safety zones adapt to current driving conditions. This resolves the contradiction by making the system reliable across all speed ranges while maintaining manageable complexity through algorithmic dynamic adjustment rather than multiple complex subsystems.
2Reliability
If multiple fixed zones are used for different speed ranges, then safety coverage is improved, but control gaps and system complexity increase
Solution Approach 1:
Instead of implementing multiple fixed zones for different speed ranges, the patent uses a single dynamic zone boundary that continuously adapts to relative speed. The electronic processing unit calculates the dynamic boundary position based on current relative speed, eliminating control gaps between fixed zones. This approach maintains comprehensive safety coverage while avoiding the complexity of managing multiple discrete zone systems and their transitions.
Solution Approach 2:
The patent changes the parameter used for zone boundary definition from fixed distance values to dynamic values based on relative speed. The electronic processing unit continuously updates the zone boundary parameters using real-time relative speed measurements, ensuring seamless coverage across all speed ranges without creating control gaps. This parameter-based dynamic adjustment resolves the contradiction by providing continuous safety coverage through a unified system rather than multiple discrete zones.
3Ease of operation
If ACC system is turned off, then driver autonomy is increased, but anti-collision protection is lost at low relative speeds
Solution Approach 1:
The patent introduces an intermediary anti-collision system that operates independently of the ACC system's on/off state. This intermediary system uses the same sensor data (relative speed from radar or lidar) to provide passive anti-collision protection through dynamic zone monitoring. When the driver has autonomy (ACC off), the intermediary system still monitors and can trigger warnings or emergency braking if the vehicle enters the dynamically calculated warning or braking zones, thus maintaining protection without interfering with driver autonomy.
Solution Approach 2:
The patent implements preliminary action by continuously calculating dynamic warning and braking zones based on relative speed before any collision risk materializes. The electronic processing unit proactively determines the appropriate safety zones and prepares the brake system in advance. This allows the system to provide protection even when ACC is turned off, as the preliminary zone calculation and brake preparation are always active based on real-time relative speed measurements.
Data Source
AI summary
A method for preventing a subject vehicle from driving into a vehicle ahead includes equipping the subject vehicle with at least one brake system, a drive system and a driver assistance system with an emergency braking function. The method also includes issuing a haptic warning when the subject vehicle enters a distance warning zone, applying emergency braking on entering an emergency braking zone, and calculating a relative speed between the subject vehicle and the vehicle ahead. The method includes continuously calculating a time to collision (TTC) when approaching the vehicle ahead, specifying a first TTC threshold value for adaptive classification of a distance from the subject vehicle to the vehicle ahead, checking, when approaching the vehicle ahead, whether the TTC falls below the first TTC threshold value, and, if the TTC falls below the first TTC threshold value, issuing a haptic warning to a driver of the vehicle.