Information Processing for Probe-Based Traffic Pulsation Detection
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Solution Overview
Problem
Conventional traffic signal control devices require vehicle detectors to calculate pulsation influence, making them ineffective on roads without detectors, and they struggle with accurate determination of pulsation due to reliance on traffic simulators and vehicle detector data.
Innovation Solution
An information processing device using probe vehicle information to calculate a delay index based on time series data, determining pulsation presence or absence by analyzing periodicity in delay times and queue lengths without relying on vehicle detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vehicle detectors are used to calculate pulsation influence, then pulsation can be detected on roads with detectors, but the system becomes ineffective on roads without detectors
Solution Approach 1:
The patent introduces probe vehicles as an intermediary data collection method. Instead of relying solely on fixed vehicle detectors, the system uses mobile probe vehicles to collect traffic data (position, speed, acceleration) and transmits it to the server. This intermediary approach enables pulsation detection on roads without permanent detectors, resolving the contradiction between reliability for detected roads and adaptability to undetected roads.
2Measurement precision
If traffic simulators and vehicle detector data are used to determine pulsation, then pulsation can be analyzed on monitored roads, but the system lacks accuracy on roads without detectors
Solution Approach 1:
The system enables probe vehicles to self-collect and self-transmit their own traffic data (position, speed, acceleration) to the server. This self-service mechanism allows any vehicle to contribute to pulsation detection on its route, eliminating the need for dedicated detectors on every road segment and maintaining measurement precision across diverse road types.
Solution Approach 2:
The patent replaces the mechanical vehicle detector system with an electronic/information-based system using probe vehicles equipped with sensors and communication devices. This substitution allows the system to function without physical detectors on the road, maintaining pulsation determination accuracy through electronic data collection and analysis.
3Ease of operation
If conventional traffic signal control devices are used, then control can be implemented on roads with detectors, but the devices cannot determine pulsation on roads without detectors
Solution Approach 1:
The patent creates a universal pulsation detection system that can operate on any road type. By using probe vehicles as a universal data collection method that works both on roads with detectors and roads without detectors, the system achieves multi-functionality. The server processes probe vehicle data to determine pulsation on any road segment, making the traffic signal control capability universally applicable regardless of detector presence.
Data Source
AI summary
An information processing device, including: a storage unit configured to store therein probe information of a probe vehicle traveling on an inflow road to an intersection; and an information processing unit configured to execute a determination process of determining presence or absence of pulsation on the inflow road. The determination process includes a process of generating time series data of a delay index that is a traffic index indicating a degree of delay in vehicle traffic due to waiting at a traffic signal, the delay index being calculated from the probe information, and a process of determining presence or absence of pulsation, based on the time series data of the delay index.