Driving Support Device Motion Estimation for Coordinated Signals
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Solution Overview
Problem
Existing driving support systems fail to accurately estimate vehicle motion on roads influenced by coordinated traffic signals, leading to insufficient support for smooth vehicle travel.
Innovation Solution
A system that obtains initial vehicle motion data and estimates subsequent motion based on this information, using guidance units to provide support for driving through coordinated traffic signals, by defining and selecting motion patterns associated with initial motions, such as starting positions and speeds, to predict vehicle travel through intersections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traffic signal cost is calculated using only coordinated lighting information, then the calculation is simple, but the estimation accuracy of vehicle motion is insufficient
Solution Approach 1:
The patent changes the parameters used in motion estimation from simple coordinated lighting information to comprehensive parameters including initial vehicle position, initial vehicle speed, traffic signal timing, and road gradient. This parameter expansion enables accurate estimation of whether the vehicle will stop or pass through intersections smoothly, resolving the contradiction between calculation simplicity and estimation accuracy.
2Speed
If the reference range is limited to up to two nodes ahead, then the calculation is fast, but the accuracy of traffic signal cost determination is insufficient
Solution Approach 1:
The patent performs preliminary calculation of motion estimation results based on initial vehicle state and traffic signal information before determining traffic signal cost. By pre-calculating whether the vehicle will stop or pass through each intersection, the system prepares accurate cost data in advance, maintaining fast calculation speed while improving accuracy.
3Ease of operation
If traffic signal coordination is considered without initial motion information, then the system is simple to operate, but it cannot accurately predict vehicle travel through intersections
Solution Approach 1:
The patent segments the motion estimation process into distinct components: obtaining initial vehicle position and speed, calculating motion estimation results for each intersection, and determining traffic signal cost based on these results. This segmentation allows the system to systematically process multiple parameters without increasing operational complexity, thereby improving prediction reliability while maintaining ease of operation.
Data Source
AI summary
Information specifying an initial motion of a vehicle when travel is started on a road in a predetermined section is obtained, and information specifying an estimated motion, which is associated in advance with the initial motion, of the vehicle on the road in the predetermined section subsequent to the initial motion is also obtained. Based on the estimated motion, a guidance unit mounted in the vehicle provides guidance for supporting driving when traveling on the road in the predetermined section.