Forklift Remote Mode Control for Abnormal Stop and Safe Restart
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Solution Overview
Problem
During remote operation of industrial vehicles, there is a risk of safety reduction due to continuous operation during abnormal situations, and unintended restarts when attempting to resume operation after an abnormal situation is addressed.
Innovation Solution
An industrial vehicle remote operation system with a mode control unit that shifts between remote mode, abnormal stop mode, and neutral mode based on detected abnormal situations and cancel operations, ensuring safety by preventing continuous operation during abnormalities and allowing controlled restarts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If remote operation is continuously performed during abnormal situations, then productivity is maintained, but safety is reduced
Solution Approach 1:
The system dynamically changes the control mode based on the operational state. When an abnormal situation is detected, the mode control unit automatically transitions from remote mode to abnormal stop mode, preventing continuous operation during abnormal conditions while maintaining productivity during normal operations
Solution Approach 2:
The abnormal situation detection unit continuously monitors the communication connection state and provides feedback to the mode control unit. This feedback mechanism enables the system to detect abnormal conditions and automatically adjust the control mode to maintain safety while minimizing disruption to productivity
2Reliability
If remote operation is stopped during abnormal situations, then safety is improved, but productivity is reduced
Solution Approach 1:
The control system is segmented into distinct modes (remote mode, abnormal stop mode, and neutral mode) with clear transition rules. This segmentation allows the system to stop operation only when necessary for safety while quickly transitioning back to productive operation once the abnormal condition is resolved
Solution Approach 2:
The system prepares for resumption of operation by maintaining the communication connection state during abnormal stop mode. The cancel operation detection unit is ready to detect when the abnormal condition is resolved, enabling quick transition from abnormal stop mode to neutral mode and subsequent resumption of remote operation
3Ease of operation
If remote operation is easily restarted after abnormal stop, then ease of operation is improved, but safety is reduced due to unintended restarts
Solution Approach 1:
The system implements dynamic control mode transitions with distinct states for abnormal stop and neutral modes. The mode control unit requires detection of a cancel operation to transition from abnormal stop mode to neutral mode, and only then allows transition to remote mode, preventing unintended restarts while maintaining ease of operation through clear, structured transitions
Solution Approach 2:
The neutral mode serves as an intermediary state between abnormal stop mode and remote mode. This intermediate state acts as a safety buffer, requiring explicit operator action to transition from abnormal stop through neutral to remote mode, thereby preventing accidental or unintended restarts while maintaining operational convenience
Data Source
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AI summary
An industrial vehicle remote operation system includes a forklift and a remote operation device used for remotely operating the forklift. The forklift includes a remote communication unit provided in the remote operation device and a vehicle communication unit that wirelessly communicates with the remote communication unit. The industrial vehicle remote operation system includes a vehicle CPU that controls a control mode of the forklift. The control mode includes a remote mode, a neutral mode, and an abnormal stop mode.