AGV Work-Zone Safety Control for Localized Emergency Stops
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Solution Overview
Problem
Current manufacturing systems for vehicle production require costly certified radio components for emergency stop functionality, leading to system-wide shutdowns and increased operational costs due to static emergency stop mechanisms that affect the entire production system.
Innovation Solution
Implementing a procedure where individual target operating data is stored in the memory modules of driverless transport cars, with continuous actual operating signals sent to control units for comparison, allowing for zone-specific emergency stops without affecting the entire system, using standardized radio technologies like WiFi or 5G, and enabling secure communication through encryption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If certified radio components are used for emergency stop functionality, then system safety is improved, but hardware costs increase
Solution Approach 1:
The patent uses standardized radio components (WiFi, 5G) instead of certified radio components by implementing a cryptographic authentication mechanism. The control unit stores target operating data and authenticates received actual operating signals through cryptographic verification, creating a secure copy of the safety function using cheaper, standardized hardware.
Solution Approach 2:
The patent changes the operational parameters of standardized radio components through cryptographic authentication. By implementing target operating data storage and cryptographic verification protocols, the system transforms ordinary radio communications into secure safety-critical communications without requiring specialized hardware.
2Reliability
If system-wide emergency stop is implemented, then safety coverage is improved, but productivity decreases due to complete system shutdown
Solution Approach 1:
The patent segments the emergency stop function from a system-wide shutdown to a localized work zone intervention. The control unit receives actual operating signals that can trigger emergency stop for specific automated guided vehicles or work zones while allowing other parts of the production system to continue operating normally.
Solution Approach 2:
The patent applies local quality by enabling differentiated safety responses in different work zones. Each work zone can have its own target operating data and authentication parameters, allowing emergency stop to be applied locally where needed while maintaining productivity in other areas of the production system.
3Device complexity
If standardized radio technologies are used, then hardware costs are reduced, but security against unauthorized access worsens
Solution Approach 1:
The patent creates a cryptographic authentication layer that copies the security function of certified radio components. By storing target operating data locally and verifying received signals through cryptographic comparison, the system replicates the security assurance of certified components using standardized, cheaper radio technologies.
Solution Approach 2:
The patent introduces cryptographic authentication as an intermediary between the standardized radio communication and the control system. The control unit acts as a mediator that verifies the authenticity of operating signals through cryptographic validation, preventing unauthorized access despite using unsecured radio hardware.
Data Source
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AI summary
The invention relates to a method for operating a production plant (10) for manufacturing workpieces (12), in particular vehicles (14), which comprises the following steps: performing work steps for manufacturing the workpieces (12) on intermediate workpieces (26) in several work zones (24) of the production plant (10) which are themselves in different production stages; conveying the intermediate workpieces (26) through the work zones (24) by means of an automated guided vehicle (AGV; 30) comprising several automated guided vehicles (AGVs) (32), wherein each AGV (32) carries a drive unit (44), a control unit (46), a sensor unit (48), a storage module (50) and a power supply unit (52), wherein the sensor unit (48) generates a sensor field surrounding the AGV (32);Coordinating the conveyor operation of the automated guided vehicles (AGVs) (32) in the production plant (10) by means of a control system (56) which sends control signals to the control units (46) of the AGVs (32). According to the invention, the following further steps are carried out: providing target operating data for each work zone (24) individually in the storage modules (50) of the AGVs (32); sending actual operating signals for each work zone (24) individually and continuously to the respective control units (50) of the AGVs (32) by means of a safety controller (74);Receiving the actual operating signals and comparing the received actual operating signals with the target operating data provided in the storage modules (50), wherein, in the event of a deviation between a part of the received actual operating signal of a work zone (24) relevant for comparison and a part of the corresponding stored target operating value relevant for comparison, a special operating mode of the driverless transport vehicles (32) in the corresponding work zone (24) is triggered. The invention further relates to a production plant (10) comprising means for carrying out the aforementioned operating procedure.