AGV Speed Control via Sensor Feedback and Watchdog Timer
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Solution Overview
Problem
Automated guided vehicles (AGVs) often collide with users or objects due to inadequate speed control, leading to damage or injury, as existing systems lack effective methods to adjust speed based on user presence and sensor functionality.
Innovation Solution
A control method for AGVs that includes a sensor, watchdog timer, and alarm system, which detects user presence and adjusts speed between two levels (first and second speeds) based on sensor state, with recovery operations to ensure safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the AGV operates at high speed to improve productivity, then productivity increases, but collision risk with users increases
Solution Approach 1:
The AGV dynamically adjusts its operating speed based on real-time sensor feedback about user presence. When users are detected in the operation area, the system automatically reduces speed from first speed to second speed, creating a dynamic speed control mechanism that balances productivity and safety
Solution Approach 2:
The system implements continuous feedback loops where sensors monitor user presence and door status, the controller processes this information, and the motor controller adjusts speed accordingly. This closed-loop control ensures the AGV responds appropriately to changing conditions
2Productivity
If the AGV operates at high speed to improve efficiency, then operation efficiency increases, but braking distance increases leading to safety issues
Solution Approach 1:
The system dynamically adjusts speed based on operational context. By operating at second speed when users are present or doors are open, the braking distance is naturally reduced, allowing the AGV to stop safely within shorter distances while maintaining efficient operation at first speed when conditions permit
3Object-affected harmful factors
If the AGV reduces speed to improve safety, then collision risk decreases, but productivity decreases
Solution Approach 1:
The AGV employs dynamic speed adjustment rather than operating at a fixed low speed. It maintains first speed for efficient operation when safe, and transitions to second speed only when necessary for safety, optimizing the balance between productivity and safety based on real-time conditions
Solution Approach 2:
The system changes the speed parameter based on detected conditions. By monitoring user presence and door status, the controller adjusts the speed parameter between two discrete values, allowing the AGV to maintain high productivity when safe while ensuring safety when users are present
4Reliability
If the system frequently adjusts speed to improve safety response, then safety reliability increases, but system complexity increases
Solution Approach 1:
The control system is segmented into distinct functional modules: sensors for detection, controller for decision-making, and motor controller for execution. This modular architecture manages complexity by dividing the control function into manageable, independent components
Solution Approach 2:
The system uses discrete parameter changes between two speed levels rather than continuous adjustment, simplifying the control logic. The controller transitions between first speed and second speed based on clear conditional thresholds, reducing the complexity of control algorithms
Data Source
AI summary
Provided is a control method for an automated guided system including a step of providing an automated guided vehicle including a sensor and a watchdog timer, a controller, and an alarm, an initializing step of initializing a count value, a first checking step of checking an abnormal state of the sensor, a count increasing step of increasing the count value, and a step of performing a recovery operation, the step of performing the recovery operation includes a second checking step of rechecking the abnormal state, a step of turning on the alarm; a third checking step of rechecking the abnormal state, and a step of turning off the alarm.