In-Vehicle Device Speed Data Evaluation for Irregular ETC 2.0 Collection
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Solution Overview
Problem
Existing driving evaluation systems struggle to effectively evaluate a driver's behavior when driving data is collected in a temporally irregular manner, such as during wireless communication with roadside devices using ETC 2.0 and ITS systems.
Innovation Solution
An information providing method and system that acquires speed information from in-vehicle devices via roadside antennas, calculates the frequency of sudden acceleration and deceleration events by determining differences in speed data, and displays evaluation information indicating these frequencies, even when data collection is irregular.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If driving behavior data is collected using ETC 2.0 wireless communication with roadside devices, then data transmission is achieved, but data collection becomes temporally irregular making driver evaluation difficult
Solution Approach 1:
The in-vehicle device performs preliminary actions by accumulating driving behavior data locally in its storage unit before transmission. This allows the system to prepare data in advance during periods when the vehicle is not near roadside devices, ensuring that sufficient data is ready for transmission when communication opportunities arise, thus maintaining evaluation accuracy despite irregular transmission timing
Solution Approach 2:
The in-vehicle device acts as an intermediary between the driver behavior and the roadside evaluation system. It collects and stores driving behavior data locally, then transmits accumulated data to the server when near roadside devices. This intermediary role bridges the gap between irregular data collection and the need for continuous evaluation, allowing the system to process data batches while maintaining evaluation accuracy
2Reliability
If speed information is stored each time the vehicle moves a prescribed distance, then data storage is achieved, but data processing complexity increases due to irregular temporal distribution
Solution Approach 1:
The evaluation period is divided into multiple prescription periods, each containing a specific number of speed information data points. This segmentation allows the system to process data in manageable chunks rather than handling all irregularly-timed data at once. By evaluating each prescription period separately and calculating occurrence frequencies within defined thresholds, the complexity of processing irregularly-distributed data is significantly reduced
Solution Approach 2:
The system changes parameters by defining prescription periods with specific data point counts and threshold values for speed differences. Instead of processing all accumulated irregular data continuously, it transforms the problem into evaluating discrete periods with defined parameters (number of data points, threshold ranges), making the processing complexity manageable while maintaining reliable storage
Data Source
AI summary
An information providing method is performed in an information providing system. The information providing method includes: acquiring pieces of speed information of a vehicle in association with identification information of an in-vehicle device from the in-vehicle device via roadside antennas, each of the pieces of speed information having been stored in the in-vehicle device each time the vehicle moves a prescribed distance before the vehicle passes by the roadside antennas; and causing an information display device to display evaluation information in association with the identification information, the evaluation information indicating a frequency of occurrence of sudden acceleration or deceleration events of the vehicle obtained from a proportion of differences between calculation values outside a threshold range, the calculation values being calculated on the basis of the pieces of speed information in a prescribed period corresponding to the pieces of speed information stored in the in-vehicle device.