Lane-Change Collision Warning Using TTC and Rear-Vehicle Dynamics
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Solution Overview
Problem
Existing vehicle collision avoidance systems fail to provide intuitive and reliable warnings for lane changes, especially in adverse conditions like night or bad weather, as they rely solely on distance information without considering relative velocities and braking inputs.
Innovation Solution
A vehicle collision avoidance system that calculates crash probability using driving information from both the host and rear vehicles, including velocity, acceleration, and deceleration, and provides visual and auditory warnings, as well as steering torque adjustments based on the calculated risk level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a blind-spot collision-avoidance system only uses distance information, then the system complexity is reduced, but the reliability of collision avoidance warning is insufficient
Solution Approach 1:
The patent changes the parameters used for collision risk assessment from only distance information to multiple parameters including relative velocity, acceleration, deceleration, and TTC (time to collision). This multi-parameter approach significantly improves the reliability of collision avoidance warnings while maintaining reasonable system complexity through efficient processing algorithms.
Solution Approach 2:
The patent introduces TTC (time to collision) as an intermediary parameter that synthesizes distance, relative velocity, and acceleration/deceleration information into a single meaningful metric. This intermediary helps integrate multiple sensor inputs and provides an intuitive collision risk assessment to the driver, improving reliability without excessive complexity.
2Ease of operation
If visual and auditory warnings with different alarm levels are provided, then the intuitiveness of collision risk information is improved, but the device complexity increases
Solution Approach 1:
The patent uses color changes in visual warnings to represent different levels of collision risk (e.g., green for safe, yellow for caution, red for high risk). This intuitive color-coding system allows drivers to quickly assess collision risk without complex displays, improving ease of operation while adding minimal device complexity.
Solution Approach 2:
The patent employs steering wheel vibration as an auditory/tactile warning mechanism that intensifies with increasing collision risk. This provides intuitive feedback to the driver about the severity of potential collision without requiring complex audio systems, balancing intuitiveness with device simplicity.
3Reliability
If steering wheel steering torque is generated in opposite direction of steering, then the effectiveness of collision avoidance is improved, but the force applied to the driver increases
Solution Approach 1:
The patent applies preliminary anti-action by generating steering wheel torque in the opposite direction of the driver's steering input when collision risk is detected. This counter-torque gently guides the driver away from the dangerous maneuver before collision occurs, improving effectiveness while keeping the force applied minimal and non-intrusive to normal driving.
Data Source
AI summary
A vehicle collision avoidance system and method. The vehicle collision avoidance system includes an input unit configured to receive driving information of a host vehicle and driving information of a rear vehicle, a memory configured to store a program that calculates a collision risk level using the driving information of the host vehicle and the driving information of the rear vehicle, and a processor configured to execute the program, wherein the processor performs control to display visual information about the risk of collision upon a right or left lane change based on the collision risk level.