Train Door Pin Position Diagnosis Using Time Series Data
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Solution Overview
Problem
Existing diagnostic techniques fail to accurately diagnose abnormalities in the positional relationship between a door-side pin and a car-side recess in the opening and closing direction of a train carriage door, leading to potential operational issues and reduced door lifespan due to friction and locking failures.
Innovation Solution
A diagnostic apparatus and method that acquire time series data during door closure, including positional data of the door and detector output, to diagnose abnormalities in the positional relationship between the pin and recess, utilizing a diagnostic mode where the pin is not restricted from moving downward, allowing for a locked state, and analyzing this data to identify clearance and travel distances for accurate assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the locking device restricts the pin from moving downward, then the door locking mechanism is stable, but the ability to diagnose positional abnormalities between pin and recess is lost
Solution Approach 1:
The diagnostic apparatus performs measurements of the pin's position and movement before the locking device restricts the pin, allowing detection of positional abnormalities between the pin and recess while the system is still in a diagnostic state rather than a locked state
2Difficulty of detecting and measuring
If the pin is allowed to move downward freely, then positional abnormalities can be diagnosed, but the door cannot maintain a secure locked state
Solution Approach 1:
The locking device is designed to dynamically switch between a diagnostic state where the pin can move downward freely for measurement purposes and a locked state where the pin is restricted to maintain door security, allowing both diagnostic and locking functions to be fulfilled at different times
3Device complexity
If traditional diagnostic methods are used, then the diagnostic system is simple, but positional abnormalities between pin and recess cannot be accurately diagnosed
Solution Approach 1:
The diagnostic apparatus replaces traditional mechanical diagnostic methods with a sensor-based measurement system that detects the pin's position and movement characteristics, providing accurate diagnosis of positional abnormalities between the pin and recess while maintaining relatively simple system architecture
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise diagnosis of positional abnormalities, reducing operational issues and extending door lifespan by accurately identifying and addressing misalignments between the pin and recess, thereby ensuring proper door operation and maintenance efficiency.
Implementation Method 1
the pin being configured to drop into a door-side recess in the train carriage by weight of the pin to allow for a locked state of the door
Data Source
AI summary
A diagnostic apparatus acquires time series data during a time period in which a door closes, upon occurrence of a condition in which a door-side pin in a train carriage is maintained in a state where a locking device does not restrict the pin from moving downward, the time series data including first time series data of a position of the door, and second time series data of an output of a detector configured to detect whether the pin has dropped. The diagnostic apparatus diagnoses, based on the acquired time series data, an abnormality in a positional relationship between the pin and a car-side recess in an opening and closing direction of the door that is in a locked state.