Rear-End Collision Avoidance via TTC-Based Forward Acceleration
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Solution Overview
Problem
Conventional Autonomous Emergency Braking Systems (AEBS) cannot prevent rear-end collisions as they only consider objects ahead of the vehicle, leaving a gap in safety for rearward vehicles.
Innovation Solution
A collision avoidance control method and apparatus that calculates the Time To Collision (TTC) with a rearward vehicle, determines the likelihood of a collision, and performs warning signal output, forward acceleration control, or lane change control functions to prevent rear-end collisions by assessing distance and speed differences between vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AEBS performs emergency braking by considering only objects ahead of the vehicle, then the system can prevent collisions with forward objects, but it cannot prevent rear-end collisions when another vehicle is located at the rear of the vehicle
Solution Approach 1:
The AEBS is enhanced to perform multiple functions: it not only detects objects ahead of the vehicle but also detects rearward vehicles and calculates TTC for both forward and rearward directions. This multi-functional approach allows the system to prevent both forward collisions and rear-end collisions using the same emergency braking mechanism
Solution Approach 2:
The system expands its detection capability from a single forward dimension to include the rearward dimension by calculating TTC with rearward vehicles. This dimensional expansion allows the AEBS to account for vehicles approaching from behind, transforming it from a unidirectional safety system to a omnidirectional one
2Reliability
If the vehicle performs forward acceleration control to avoid rear-end collision, then the collision with rearward vehicle can be avoided, but the vehicle may collide with a forward vehicle traveling ahead
Solution Approach 1:
The system continuously monitors both forward and rearward TTC values and uses this feedback to make intelligent decisions. When rearward TTC indicates imminent collision but forward TTC shows safe distance, the system executes forward acceleration. Conversely, when forward TTC indicates potential collision, the system suppresses acceleration or triggers braking instead, creating a closed-loop safety control mechanism
Solution Approach 2:
The system calculates TTC for both forward and rearward vehicles in advance and uses this preliminary information to predict potential collision scenarios. By anticipating the need to avoid rear-end collisions while checking forward safety conditions beforehand, the system takes preventive action that counteracts the harmful effect of rear-end collisions without creating forward collision risks
Data Source
AI summary
A collision avoidance control method for a vehicle, through which a collision avoidance control apparatus controls a vehicle to avoid a collision. The collision avoidance control method includes: calculating a TTC (Time To Collision) between the vehicle and a rearward vehicle, when the rearward vehicle approaching the rear of the vehicle is sensed; determining whether the vehicle and the rearward vehicle are likely to collide with each other, by comparing the TTC to a preset reference TTC; and performing a collision avoidance function when it is determined that the vehicle and the rearward vehicle are likely to collide with each other, the collision avoidance function including one or more of a collision risk warning signal output function, a forward acceleration control function and a lane change control function.