CBTC Hybrid Train Control with Variable Marshalling Lengths
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Solution Overview
Problem
Existing Communication Based Train Control (CBTC) systems are limited in their ability to support hybrid running of trains with different marshalling lengths, as they require a fixed marshalling length for safe operation, which restricts the application scope and efficiency in recognizing and authorizing movement for trains with varying lengths.
Innovation Solution
A control method and system that determines the presence of vehicles in front of and behind trains within preset screening areas, allowing for the determination of marshalling lengths and providing movement authorization, enabling the hybrid running of trains with different lengths by setting screening areas based on allowed marshalling and minimum train running lengths, and using axle counting magnetic heads to calculate distances and verify information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CBTC system uses a fixed marshalling length for safety control, then the safety protection and movement authorization can be provided timely, but the system cannot support hybrid running of trains with different marshalling lengths
Solution Approach 1:
The patent applies dynamics by making the marshalling length parameter variable rather than fixed. The system dynamically determines the actual marshalling length of each train based on its formation (6-compartment or 8-compartment) and uses this variable parameter for safety calculations and movement authorization. This allows the CBTC system to adapt to different train configurations while maintaining timely safety protection.
Solution Approach 2:
The patent changes the parameter of marshalling length from a fixed value to a variable that can take different values (6-compartment or 8-compartment lengths). The system determines the actual marshalling length parameter for each train and uses it in safety calculations, enabling the system to handle hybrid running of trains with different formations while maintaining safety.
2Productivity
If the CBTC system quickly determines vehicle presence in safety range, then movement authorization can be provided timely, but only one type of train with fixed marshalling length can run in the same line
Solution Approach 1:
The patent applies preliminary action by pre-setting multiple screening areas corresponding to different marshalling lengths (6-compartment and 8-compartment) before trains enter the CBTC area. When a train enters, the system quickly determines which pre-set screening area matches the train's actual formation, enabling rapid movement authorization without complex real-time calculations, thus maintaining high productivity while supporting hybrid running.
Solution Approach 2:
The patent segments the screening area into multiple distinct zones, each corresponding to a specific marshalling length (6-compartment or 8-compartment). This segmentation allows the system to quickly match a train's formation with the appropriate pre-configured screening area, enabling fast movement authorization decisions while supporting multiple train types with different lengths.
3Measurement precision
If the system determines marshalling length based on train formation, then accurate safety control is achieved, but the system cannot accommodate trains with varying lengths in the same running line
Solution Approach 1:
The patent applies universality by creating a screening area determination mechanism that works for multiple train formations (both 6-compartment and 8-compartment trains). The system uses a universal approach of pre-setting multiple screening areas that can accommodate different marshalling lengths, allowing the same CBTC system to accurately determine safety parameters for various train types running in the same line.
Data Source
AI summary
A method of controlling hybrid operation of trains having different formation lengths and a communication-based train control (CBTC) system are provided. The method includes: before a train travels into a CBTC area, determining, according to a preset filter area, whether any other vehicle exists in front of the train in a travel direction thereof, if no other vehicle exists in front of the train in the travel direction thereof, determining a formation length of the train according to the filter area, determining, according to the formation length of the train and the filter area, whether any other vehicle exists behind the train in the travel direction thereof, and if no other vehicle exists behind the train in the travel direction thereof, providing the train with a movement authorization.