Train Position Recovery via Remote Restricted Mode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In fully automatic urban rail transportation systems, when a train loses its position due to a failed positioning module or other reasons, it cannot continue operating, leading to inefficiencies as manual intervention is required, especially in Grade of Automation 4 (GoA4) scenarios where no driver is present to supervise.
Innovation Solution
An automatic driving method is introduced that allows a train in an emergency-brake-stop state to enter a Remote Restricted Train Operating Mode (RRM) under the control of a Traffic Control Integrated Automation System (TIAS) and a Zone Controller (ZC), enabling the train to continue moving to a designated platform without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the train operates in Full Automatic Mode (FAM) and loses position, then the train must stop and wait for manual intervention, but this causes low operational efficiency and track disruptions
Solution Approach 1:
The train system performs self-diagnosis and self-recovery when position is lost. The VOBC detects position loss, automatically transitions to RRM mode, and continues operation without requiring manual driver intervention, thereby maintaining operational efficiency while handling the position loss reliability issue
Solution Approach 2:
The system changes the operational mode parameter from FAM to RRM when position is lost. This parameter change allows the train to operate with modified control characteristics (restricted movement authority, speed limits) that enable continued operation despite position loss, resolving the contradiction between reliability and productivity
2Reliability
If the train stops on the track due to position loss, then safety is maintained through emergency brake, but this affects normal operation of other trains
Solution Approach 1:
The system dynamically adjusts the train's operational state based on position status. Instead of a static emergency stop, the train transitions to a dynamic RRM mode where it can move under restricted authority, allowing safety measures to be adaptive rather than fixed, thus maintaining safety while reducing impact on overall system productivity
Solution Approach 2:
The control authority is segmented into different levels: full automatic control in FAM mode and restricted control in RRM mode. When position is lost, the system segments the control authority by limiting movement to specific authorized areas while allowing continued movement, thereby maintaining safety without complete shutdown and reducing impact on other trains
3Reliability
If manual intervention is required for position loss recovery, then the train can be recovered safely, but this requires dispatching a driver and reduces operational efficiency
Solution Approach 1:
The train system performs automatic failure recovery by detecting position loss and autonomously transitioning to RRM mode, eliminating the need to dispatch a driver. This self-service capability resolves the contradiction by providing both safe recovery (through controlled restrictions) and reduced recovery time (by eliminating manual intervention delays)
Solution Approach 2:
The system prepares for position loss by having the RRM mode pre-configured and ready. When position is lost, the transition to RRM is immediate without requiring driver arrival or manual setup, as the recovery protocol is already established in advance, thus reducing recovery time while maintaining safety
Data Source
AI summary
The present disclosure provides an automatic driving method, a VOBC, a TIAS, and a ZC. The method includes: sending, when a position of a target train is lost in a FAM mode and the target train is in an emergency-brake-stop state, a train message to a TIAS and fault information indicating loss of train position to a ZC, the train message including request information for a RRM mode; receiving a RRM mode instruction sent by the TIAS and a movement instruction sent by the ZC; and controlling the target train to travel in the RRM mode according to the RRM mode instruction and the movement instruction. With the technical solutions provided in the present disclosure, operation efficiency of the train can be improved.