Plug Door Guide Roller Abnormality Diagnosis
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Solution Overview
Problem
The existing plug door device cannot diagnose malfunctions in the guide roller or guide rail until the door panel fails to move, making it difficult to detect abnormalities in these components.
Innovation Solution
A diagnosing device that identifies the plugging operation period and obtains drive information, such as current or torque values, to diagnose abnormalities in the guide roller or guide rail based on observed drive information during the plugging operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drive information is monitored continuously during all operation periods, then abnormality detection capability is improved, but energy consumption and system complexity increase
Solution Approach 1:
The system pre-identifies the plugging operation period as a critical monitoring window before actual abnormalities occur. By knowing in advance when high-load operations occur, the system can prepare to monitor drive information only during these periods, avoiding continuous monitoring and reducing energy consumption while maintaining reliable abnormality detection.
Solution Approach 2:
Instead of monitoring drive information during all operation periods (excessive action), the system selectively monitors only during the plugging operation period (partial action). This partial monitoring approach is sufficient to detect abnormalities in guide rollers and guide rails while significantly reducing energy consumption compared to continuous monitoring.
2Use of energy by stationary object
If drive information is monitored only during opening-closing operations, then energy consumption is reduced, but abnormality detection precision deteriorates
Solution Approach 1:
The system applies different monitoring strategies to different operation periods based on their characteristics. During the plugging operation period (high-load local condition), comprehensive drive information monitoring is activated for precise abnormality detection. During other periods, monitoring is reduced or suspended. This local quality approach ensures high detection precision when needed while minimizing energy consumption.
Solution Approach 2:
The system pre-identifies the plugging operation period as the critical monitoring window before actual abnormalities occur. By knowing in advance when high-load operations occur, the system can activate precise monitoring only during these periods, ensuring abnormality detection precision without requiring continuous monitoring.
3Device complexity
If general threshold values are used for abnormality diagnosis, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The system establishes separate threshold values specifically for the plugging operation period rather than using general thresholds for all operations. This local quality approach recognizes that the plugging operation has unique load characteristics requiring specialized diagnostic criteria, thereby improving diagnosis precision without significantly increasing overall system complexity.
Solution Approach 2:
The system changes the diagnostic parameter thresholds based on the operation period. Different threshold values are applied during plugging operations compared to other operations, allowing the diagnosis system to adapt to varying operational conditions and improve precision without requiring a completely complex adaptive system.
Data Source
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AI summary
A diagnosing device identifies a plugging operation period in which a plug door performs a plugging operation, the plug door having a guide roller attached thereto, the plug door being configured to perform an opening-closing operation and the plugging operation by allowing the guide roller to move along a guide rail; obtains drive information including a value representing at least one of a current value or a torque value of a drive unit, the drive unit being configured to drive the plug door; and diagnoses an abnormality in the guide roller or the guide rail based on the drive information observed during the identified plugging operation period.