Adaptable Vehicle Dimensions for Intersection Collision Avoidance
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Solution Overview
Problem
Conventional collision avoidance systems fail to accurately assess collision threats when the target vehicle's dimensions are not accurately accounted for, particularly in cases where the target vehicle is towing another object, leading to incorrect trajectory projections and deceleration calculations.
Innovation Solution
A method that adjusts the target vehicle's length in collision threat assessments using adaptable vehicle dimensions, incorporating checks for towing scenarios, and calculates the required speed change and deceleration for the host vehicle to avoid collisions by determining the potential collision zone and Brake Threat Number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional collision avoidance systems use fixed vehicle dimensions for collision threat assessment, then the system complexity is reduced, but the measurement precision of collision threat assessment deteriorates when the target vehicle is towing objects
Solution Approach 1:
The system dynamically adjusts the target vehicle's length parameter based on detected towing conditions. When a towing scenario is identified through sensor data analysis, the system automatically modifies the vehicle dimension parameters from fixed values to adaptive values that reflect the actual extended length, resolving the contradiction between system simplicity and assessment accuracy
Solution Approach 2:
The system changes the length parameter of the target vehicle from a constant value to a variable value based on towing detection. By monitoring whether the actual length exceeds the standard vehicle length, the system adjusts the collision threat assessment parameters accordingly, improving measurement precision without significantly increasing system complexity
2Speed
If the system uses inaccurate vehicle dimensions for trajectory projection, then the calculation speed is maintained, but the reliability of collision threat assessment deteriorates
Solution Approach 1:
The system performs preliminary detection of towing conditions before conducting collision threat assessment. By first determining whether the target vehicle is towing objects using sensor data and comparing actual length against standard dimensions, the system prepares accurate vehicle dimension parameters in advance, ensuring both reliable assessment and efficient calculation speed
3Ease of operation
If the system does not account for towing scenarios, then the ease of operation is maintained, but the accuracy of deceleration calculation deteriorates
Solution Approach 1:
The system automatically detects towing scenarios and adjusts vehicle dimension parameters without requiring manual intervention. Through self-service monitoring of sensor data and automatic parameter adjustment, the system maintains ease of operation while improving deceleration calculation accuracy by using the actual extended vehicle length when towing is detected
Data Source
AI summary
A method for avoiding a collision between a host vehicle and a target vehicle defines the intersection of their trajectories as the potential collision zone. The method calculates the distance to be traversed and the time required for the target vehicle to reach the collision zone and to clear it. The method then incorporates the possible cases when the target vehicle may be towing a trailer, and uses an adjusted value for the length of the target vehicle for further calculations in such cases. Further, the deceleration required by the host vehicle to allow the target vehicle to pass safely under a ‘brake to pass’ condition is calculated. The method then evaluates a break threat number based on this deceleration value and provides warning signals to the occupant of the host vehicle, to apply the brakes immediately or after a certain time, based on the break threat number value.