Obstacle Detection Sensor for Curved Rail Transport
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Solution Overview
Problem
In article transport facilities with curved travel paths, obstacle detection sensors often incorrectly detect objects outside the path, leading to unnecessary emergency stops and increased installation work due to the shifting detection area.
Innovation Solution
An article transport facility with a setting portion that adjusts the detection area of the obstacle sensor based on the in-contact-rail shape, ensuring the detection area remains aligned with the travel path, reducing false obstacle detections and eliminating the need for non-reflective sheets on installed objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the obstacle detection sensor uses a fixed detection area, then the sensor can detect obstacles ahead of the vehicle, but the detection area shifts off the travel path in curved portions causing false obstacle detections
Solution Approach 1:
The detection area is made dynamic by adjusting its shape based on the rail curvature. The setting portion changes the detection area configuration according to the in-contact-rail shape, allowing the detection area to adapt to curved portions and prevent false detections while maintaining obstacle detection capability.
Solution Approach 2:
The shape parameters of the detection area are changed based on the rail geometry. By modifying the detection area shape parameter according to the in-contact-rail shape, the system adapts to curved portions and eliminates false obstacle detections without compromising safety.
2Reliability
If non-reflective sheets are attached to objects around curved portions to prevent false detections, then false obstacle detections are reduced, but the installation work increases
Solution Approach 1:
The mechanical approach of attaching non-reflective sheets is replaced with a control system approach. The setting portion dynamically adjusts the detection area shape based on rail geometry, eliminating the need for physical modifications to objects and reducing installation complexity.
Solution Approach 2:
Instead of physically modifying the environment with non-reflective sheets, the system changes the detection parameter (detection area shape) to adapt to curved portions. This software-based solution eliminates installation work while maintaining detection accuracy.
3Reliability
If the detection area is expanded to cover curved portions, then false detections are reduced, but the detection area may include areas where the vehicle would not travel
Solution Approach 1:
The detection area configuration is optimized locally for different rail sections. The setting portion adjusts the detection area shape according to the specific in-contact-rail shape, providing appropriate detection coverage for each location without unnecessary expansion into areas where the vehicle would not travel.
Data Source
AI summary
An article transport facility includes one or more rails which include one or more portions in which a travel path is curved, and an article transport vehicle configured to travel along the one or more rails to transport an article. The article transport vehicle includes a guided portion configured to be in contact with the one or more rails to be guided thereby, an obstacle detection sensor configured to detect an obstacle in a detection area which is set to be located ahead of the article transport vehicle, and a setting portion configured to changeably set the detection area. The setting portion is configured to change the detection area depending on an in-contact-rail shape which is a shape of one or more portions of the one or more rails that the guided portion is in contact with.