Transport Carriage Trigger Signaling for Interference-Free Equipment Handoff
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Solution Overview
Problem
In semiconductor manufacturing transport systems, continuous transmission of trigger signals by communication devices leads to interference and communication failures when multiple devices are in proximity, disrupting the interlock process between transport carriages and equipment.
Innovation Solution
Implement a control method where only the transport carriage or specific communication device transmits a trigger signal when within a predetermined distance of the equipment, eliminating the need for continuous signal transmission and reducing interference, and utilizing identifiers for device recognition in wireless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each communication device continuously transmits trigger signals to search for communication partners, then the system can maintain constant readiness for communication, but trigger signals from adjacent communication devices interfere with each other causing communication failure
Solution Approach 1:
The patent changes the communication mode from continuous transmission to periodic transmission triggered by distance-based events. The transport carriage periodically checks its distance to equipment and only transmits trigger signals when entering a predetermined distance range, eliminating continuous signal transmission and reducing interference between adjacent communication devices.
Solution Approach 2:
The patent applies different communication behaviors to different spatial locations. Communication devices transmit trigger signals only when the transport carriage is within a specific distance range (local area), rather than continuously across the entire system. This localized transmission approach reduces signal interference while maintaining communication reliability in the relevant area.
2Area of stationary object
If multiple communication devices transmit trigger signals simultaneously, then communication coverage is maximized, but signal interference occurs leading to communication failure
Solution Approach 1:
The system performs preliminary distance checking before trigger signal transmission. The transport carriage calculates its distance to equipment in advance and only activates transmission when the distance condition is met, preventing simultaneous transmission from multiple devices and ensuring communication success.
Solution Approach 2:
The patent introduces dynamic, conditional transmission behavior where communication devices activate based on real-time distance conditions. Instead of static continuous transmission, the system dynamically adjusts transmission activity based on the transport carriage's position, maintaining communication coverage while avoiding interference.
Data Source
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AI summary
In a control method, a controller (20) obtains equipment specifying information specifying an equipment (40) to which a transported object is to be delivered, and a transport carriage (30) obtains carriage position information indicating the position of the transport carriage (30). Any one of the transport carriage (30), a specific communication device (10), and the controller (20) calculates the distance between the transport carriage (30) and the specific communication device (10) based on delivery position information indicating the position of a specific equipment (40) and the carriage position information, and determines whether the distance is less than or equal to a predetermined distance. When the distance is determined to be less than or equal to the predetermined distance, one of the transport carriage (30) and the specific communication device (10) transmits, wirelessly to the surroundings, a trigger signal for starting wireless communication between the transport carriage (30) and the specific equipment (40), and performs wireless communication for delivery of the transported object between the transport carriage (30) and the specific equipment (40).