Vehicle Collision Risk Index Using Lateral Acceleration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional Time To Collision (TTC) parameters fail to accurately represent the risk of collision for vehicles experiencing sideway acceleration, leading to false danger assessments during collision avoidance maneuvers.
Innovation Solution
A collision determination apparatus that includes a distance acquisition unit, relative speed acquisition unit, lateral acceleration detector, and collision risk index calculation unit, which calculates a collision risk index considering lateral acceleration to accurately assess collision risk even during sideway acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional TTC parameter is used to assess collision risk, then the assessment is simple and based on straightforward distance and speed measurements, but the assessment becomes inaccurate when the vehicle experiences lateral acceleration during collision avoidance maneuvers
Solution Approach 1:
The patent modifies the traditional TTC calculation by introducing lateral acceleration as an additional parameter. The collision risk index is recalculated to include the effect of lateral acceleration on relative speed, transforming the simple distance-speed relationship into a more comprehensive model that accounts for vehicle dynamics during avoidance maneuvers. This parameter expansion resolves the accuracy issue while maintaining computational feasibility.
Solution Approach 2:
The patent introduces a lateral acceleration detection mechanism as an intermediary element that bridges the gap between simple motion parameters and accurate collision risk assessment. By detecting lateral acceleration and using it to adjust the relative speed calculation, the system mediates between the simplicity of traditional TTC and the complexity of full dynamic modeling, achieving accurate assessment without excessive computational burden.
2Reliability
If the TTC calculation considers only front-rear direction motion variables, then the calculation remains simple and based on basic kinematics, but the assessment yields false danger values when lateral motion is present
Solution Approach 1:
The patent enhances the reliability of collision risk assessment by modifying the calculation parameters to include lateral acceleration effects. The relative speed is adjusted based on detected lateral acceleration, ensuring that the collision risk index accurately reflects the true danger level even during complex avoidance maneuvers. This parameter enhancement eliminates false alarms while maintaining system reliability.
3Measurement precision
If the TTC is calculated during straight path travel, then the parameter correctly represents collision risk, but it fails to represent correct risk once steering wheel operation generates lateral acceleration
Solution Approach 1:
The patent makes the collision risk assessment dynamic by continuously monitoring lateral acceleration and adjusting the relative speed calculation accordingly. Unlike the static TTC calculation that assumes straight-line motion, this system adapts to changing vehicle states during avoidance maneuvers. The assessment remains accurate whether the vehicle is traveling straight or executing complex avoidance actions, significantly improving versatility across different driving conditions.
Solution Approach 2:
The patent enables the system to adapt to different traveling conditions by dynamically adjusting calculation parameters based on detected lateral acceleration. When lateral acceleration is detected during avoidance maneuvers, the system modifies the relative speed parameter to account for the altered motion dynamics. This parameter adaptation ensures accurate collision risk measurement across all driving scenarios, from straight travel to complex avoidance maneuvers.
Data Source
AI summary
A collision determination apparatus detects a current value of a lateral acceleration of a subject vehicle for calculating a collision risk index, and the collision risk index is used to determine the risk of collision of the subject vehicle with a front object. As the collision risk index takes the lateral acceleration of the subject vehicle into account, the collision risk index correctly represents a risk of collision of the subject vehicle with the front object when the subject vehicle is traveling in a condition that is under an influence of the lateral acceleration.