Warehouse Robot Control Using Rack Position Beacons
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Solution Overview
Problem
Existing warehouse systems face instability in controlling a large number of transportation robots due to high communication demands, leading to potential collisions and unreliable wireless communication, especially when robots are positioned in various locations within the warehouse.
Innovation Solution
A transportation robot control system with a central wireless communication unit, individual wireless communication units, and information holding units in the rack, allowing for stable control of robots by reading position information and generating movement routes to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large number of automated devices are used to transport trays, then item picking work efficiency is improved, but communication overload occurs leading to unstable control
Solution Approach 1:
The system divides the centralized control architecture into distributed autonomous control units, one for each automated device. Each control unit independently manages its assigned device, eliminating the communication bottleneck at the central controller and enabling stable control of a large number of devices simultaneously.
Solution Approach 2:
Each automated device is equipped with its own control unit that autonomously determines movement routes and avoids collisions without requiring continuous communication with the central controller. The devices self-manage their operations based on local information from beacons and other devices.
2Ease of operation
If wireless communication is used to control automated devices, then ease of operation is improved, but communication reliability deteriorates in certain positions
Solution Approach 1:
Beacons are deployed throughout the warehouse to serve as intermediary information sources. Automated devices read position information from these beacons instead of relying solely on continuous wireless commands from the central controller, ensuring reliable position detection even in areas with poor wireless coverage.
3Stability of the object's composition
If centralized control is used for all automated devices, then coordination is improved, but communication load increases
Solution Approach 1:
The centralized control function is segmented and distributed to individual control units on each automated device. Each control unit handles local decision-making for its device, dramatically reducing the communication load on the central system while maintaining coordination through shared awareness of device positions and routes.
Solution Approach 2:
Control decisions are made locally at each automated device based on local conditions (position from beacons, presence of other devices). This local quality approach eliminates the need for continuous centralized communication while maintaining system-wide coordination.
4Reliability
If autonomous control is implemented in each robot, then control stability is improved, but device complexity increases
Solution Approach 1:
A standardized control unit design is implemented across all automated devices, providing universal functionality for autonomous operation. This multi-functional unit handles position reading, route determination, collision avoidance, and wireless communication, simplifying the overall system architecture despite the autonomous capabilities.
Data Source
AI summary
An object is to provide a transportation robot control system for a warehouse system and a control method that can stably control a large number of robots by wireless communication.A transportation robot control system 3 controls transportation robots 30 in a warehouse system 1. The transportation robot control system 3 includes: a central wireless communication unit 200 configured to be able to wirelessly communicate with the transportation robots 30 in a specific region of the warehouse system 1; an individual wireless communication unit 210 configured to be able to wirelessly communicate with the transportation robots 30; and individual control units 220 that respectively control the movements of the transportation robots 30. The individual wireless communication unit 210 includes information reading units 211 that are respectively provided in the transportation robots 30 and a plurality of information holding units 212 that are arranged in a rack 2. Each of the information holding units 212 holds position information indicating a position in the rack 2, at the position, the information holding unit 212 is arranged.