Train Driving Determination Tables for Fluctuating Operating Conditions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In railway systems, fluctuating factors such as overhead wire voltage and boarding rate complicate train travel, making it difficult to maintain exact speed profiles and punctuality, especially with limited computing powers and communication capacities in existing train control systems, which leads to increased computing costs and communication loads.
Innovation Solution
A train operation support system that includes a driving operation determination table data creation unit, which calculates and transmits data for determining driving operations, incorporating constant speed and coasting operations to reduce acceleration and maintain punctuality, while minimizing communication and computing burdens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If speed profile data for multiple conditions is transmitted from ground device to train to cope with fluctuation factors, then adaptability to different traveling conditions is improved, but communication load increases beyond available capacity
Solution Approach 1:
The patent segments the speed profile data into multiple condition-specific data sets (e.g., different overhead wire voltage conditions, different boarding rate conditions). Instead of transmitting all possible speed profiles continuously, the system transmits only the relevant segment corresponding to current conditions, reducing communication load while maintaining adaptability.
Solution Approach 2:
The ground device pre-calculates and stores speed profiles for various conditions before the train journey. When the train needs speed profile data, the ground device quickly transmits the pre-computed data for the current condition rather than calculating in real-time, reducing both computation time and communication requirements.
2Measurement precision
If computing power on train equipment is increased to handle real-time control, then control accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces a communication interface as an intermediary between the ground device (which has high computing power) and the train equipment (which has limited computing power). The ground device performs complex speed profile calculations and transmits results to the train, allowing high control accuracy without requiring high computing power on the train itself.
Solution Approach 2:
The patent replaces the mechanical/computational system on the train with a communication-based system. Instead of equipping the train with powerful local computing resources, the system substitutes this with efficient communication channels to ground devices that perform the heavy computational work, reducing on-train device complexity.
3Speed
If all speed profile data is transmitted continuously to ensure real-time control, then response time is improved, but communication capacity is exceeded
Solution Approach 1:
The patent applies local quality by transmitting speed profile data selectively based on current train conditions. Instead of continuously transmitting all speed profile data, the system transmits only the specific data relevant to current conditions (e.g., current overhead wire voltage range, current location), ensuring fast response while minimizing data transmission volume to fit within communication capacity.
Data Source
Figure 1
Figure 2~2(B)
Figure 3
AI summary
A train operation support device (driving operation determination table data creation unit 11) provides driving operation determination table data information 119 which constitutes one of predetermined input information and provides a determination criterion of a driving operation, to a train system that determines the driving operation of a train based on the predetermined input information. The driving operation determination table data creation unit 11 includes an overall table creation unit 115 that creates overall table information 116 according to table information related to an entire target section on which the train travels, and a table region limiting unit 118 that limits, from the overall table information 116, table information of a region where switching of the driving operation is performed within the fluctuation range of the external factor that affects traveling of the train, and outputs the limited table information as the driving operation determination table data information 119.