Mobile Robot Safety Circuit for Collision and Obstacle Monitoring
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Solution Overview
Problem
Current safety control systems for mobile robots are cumbersome, costly, and fail to meet international safety standards like ISO-13849-1 due to complex logic circuits, making them unreliable and difficult to integrate effectively.
Innovation Solution
A safety control system for mobile robots that includes multiple monitoring circuits (first, second, and third monitoring circuits) and a safety control circuit connected to a servo circuit and main control board, which generates safety instructions based on movement data, collision signals, and obstacle detection to control the robot's motor, improving safety and reliability without external PLCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external safety PLC is applied to realize safety control, then safety monitoring capability is improved, but system complexity and cost increase
Solution Approach 1:
The patent merges the safety control function into the robot's internal control system by integrating a safety control circuit board with multiple monitoring circuits (first monitoring circuit for movement state, second monitoring circuit for collision detection, third monitoring circuit for obstacle detection). This consolidation eliminates the need for external safety PLCs while maintaining comprehensive safety monitoring capabilities, thereby reducing system complexity and cost.
2Device complexity
If general logic circuits are used for safety control, then device complexity is reduced, but safety requirements of ISO-13849-1 cannot be met
Solution Approach 1:
The safety control circuit board is segmented into multiple specialized monitoring circuits, each dedicated to a specific safety function: the first monitoring circuit monitors movement state of mobile devices, the second monitoring circuit detects collisions, and the third monitoring circuit identifies obstacles. This segmentation allows each circuit to be optimized for its specific function while collectively meeting ISO-13849-1 safety requirements, achieving both simplicity and compliance.
Solution Approach 2:
Each monitoring circuit provides real-time feedback to the safety control circuit board: the first monitoring circuit feeds back movement state data, the second monitoring circuit feeds back collision signals, and the third monitoring circuit feeds back obstacle detection information. The safety control circuit board processes these feedback signals and generates appropriate safety instructions, creating a closed-loop control system that ensures compliance with safety standards while maintaining circuit simplicity.
3Reliability
If multiple monitoring circuits and integrated safety control are implemented, then safety reliability is improved, but circuit complexity increases
Solution Approach 1:
The patent combines multiple monitoring circuits (first monitoring circuit, second monitoring circuit, third monitoring circuit) and the safety control circuit board into a single integrated safety control system within the robot. This merging approach maintains high safety reliability through comprehensive monitoring while reducing overall system complexity by eliminating external safety devices and interconnections.
Solution Approach 2:
The safety control circuit board serves multiple functions simultaneously: it receives and processes signals from all three monitoring circuits, generates different types of safety instructions (first safety instruction, second safety instruction, third safety instruction), and controls the servo circuit to execute appropriate safety responses. This multi-functionality reduces the need for separate dedicated circuits for each safety function, thereby maintaining reliability while controlling complexity.
Data Source
AI summary
A mobile robot and a safety control system therefor. The safety control system includes a first monitoring circuit to movement data of the mobile robot; a second monitoring circuit to monitor whether the mobile robot collides with an obstacle; a third monitoring circuit to monitor whether an obstacle exists within a preset range of the mobile robot; a safety control circuit to generate a first safety instruction based on the movement data, a second safety instruction based on the collision signal, a third safety instruction based on the alarm signal, and a fourth safety instruction based on state information of the safety input device; a servo circuit to receive and execute a corresponding safety instruction; and a main control board to output a drive control signal to the servo circuit, for causing the servo circuit to control a motor of the mobile robot based on the drive control signal.