Train Display Orientation Control via Stopped-State Detection
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Solution Overview
Problem
Conventional display devices on trains often incorrectly determine their orientation due to vibrations during movement, leading to display content being shown upside down.
Innovation Solution
A display device equipped with a detector to assess its installation state and a controller that uses train information to determine the correct display orientation only when the train is stopped, preventing erroneous determinations during movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the display device always reflects the detection results from the upside-down sensor, then the display orientation can be automatically adjusted, but erroneous determination occurs due to vibration during movement
Solution Approach 1:
The controller determines the display method in advance when the train is stopped, before movement begins. This preliminary determination ensures that the display orientation is correctly set before vibration occurs, avoiding erroneous adjustments during movement.
Solution Approach 2:
The controller periodically checks the train's movement state and only updates the display method when the train is stopped. This periodic updating mechanism prevents continuous erroneous adjustments during movement while maintaining correct orientation when stationary.
2Adaptability or versatility
If the display device uses detection results during movement, then real-time orientation adjustment is possible, but vibration causes wrong determination of installation state
Solution Approach 1:
The system performs the detection and determination of display method in advance when the train is stopped, before movement begins. This ensures that the installation state is correctly identified before vibration interferes with detection accuracy.
Solution Approach 2:
The controller is designed to ignore detection results during movement and only accept determination when the train is stopped. This protective mechanism prevents vibration-induced errors from affecting the display orientation.
3Adaptability or versatility
If the display method is determined continuously, then the display can adapt to installation state changes, but vibration during movement causes incorrect orientation
Solution Approach 1:
The controller periodically determines the display method only when the train is in a stopped state. This periodic determination ensures that the display adapts to installation state changes without being affected by vibration during movement.
Solution Approach 2:
The controller uses feedback from the detector about the installation state, but only processes this feedback when the train is stopped. This selective feedback processing allows the display to adapt correctly while preventing vibration-induced errors.
Data Source
AI summary
A display device mounted on a train includes: a display capable of displaying display data by a plurality of display methods with different orientations; a detector that detects the installation state of the display; and a controller that acquires train information from which it is possible to determine whether the train is currently stopped, determines whether the train is currently stopped using the train information, determines a display method for the display data in the display on the basis of a result of detection performed by the detector when the train is currently stopped, and does not determine the display method in the display when the train is not currently stopped.