Train Data Transmission Format Reducing Address Overhead
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Solution Overview
Problem
Conventional train data transmission systems fail to reduce the amount of transmission data and increase data transmission speed when the formation of cars changes, leading to an increased load on communication lines.
Innovation Solution
A train data transmission system where the front car includes a central control device that manages data from other cars, and a display device requests data using a transmission format that assigns an address only to the front car's data, allowing subsequent cars' data to be allocated sequentially, reducing the need for additional addresses in the transmission format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If address information is assigned to each car's data in the transmission format, then data identification accuracy is improved, but the amount of transmission data increases
Solution Approach 1:
The transmission data is segmented into two parts: a common header containing the base address information, and car-specific data portions. The header is transmitted once and reused for all cars, while only the variable data portions are transmitted for each car. This segmentation eliminates redundant address information in each transmission while maintaining accurate data identification.
Solution Approach 2:
The base address information is prepared and transmitted in advance as a common header before the actual car data transmission. This preliminary action allows subsequent data transmissions to reference the pre-established address framework without repeating the address information, thereby reducing overall transmission data volume while preserving identification accuracy.
2Measurement precision
If the transmission data format includes complete address information for all cars, then data routing accuracy is improved, but the data transmission speed decreases
Solution Approach 1:
The transmission format is segmented into a common header with base address information and car-specific data sections. The header is transmitted once and serves as a reference for all subsequent data, eliminating the need to repeat address information for each car. This segmentation maintains routing accuracy through the header while significantly reducing transmission time by eliminating redundant address data in each car's transmission.
Solution Approach 2:
The base address and routing information are established in advance in the common header before actual data transmission begins. This preliminary action creates a reusable framework that enables fast subsequent transmissions without sacrificing routing accuracy, as the pre-established header provides the necessary identification information for all cars.
3Adaptability or versatility
If the monitoring device stores data for all possible car formations, then adaptability to different formations is improved, but the storage capacity requirement increases
Solution Approach 1:
The system stores only essential base address information and data structure templates in advance, rather than complete data sets for all possible car formations. This preliminary storage of framework information enables the system to adapt to different formations by reusing the stored templates with varying data lengths, achieving high adaptability with minimal storage requirements.
Solution Approach 2:
The stored base address information and data structure templates serve multiple functions across different car formations. A single set of stored framework data can accommodate various train configurations by adjusting the number of cars and their arrangements, eliminating the need to store separate complete data sets for each possible formation and thereby reducing storage capacity requirements while maintaining universal adaptability.
Data Source
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AI summary
An object is to obtain a train data transmission system capable of reducing the amount of transmission data. In the train data transmission system for a train including a plurality of cars, a front car of the train includes: a front car control device that is a central control device configured to send and receive data to and from a control device of a train information management device installed in a following car; an on-board instrument configured to send state information to the front car control device, and receive a control command from the front car control device; and a display device configured to request data from the front car control device using a transmission data format, and receive the data from the front car control device in accordance with the transmission data format. An address is assigned only to data of the front car in the transmission data format, and the display device allocates data of the following car in sequence.