Construction Machine Safety Device Gate Lock Lever Warning Logic
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Solution Overview
Problem
Construction machines face operational issues when the seat belt is not worn, leading to potential safety hazards and non-operability due to disabled operations, especially when the seat belt sensor is damaged.
Innovation Solution
A safety device for construction machines that includes a status information acquisition section, a seat belt detection section, and a control section to provide warnings when the operator is not wearing a seat belt, with varying warning modes based on the gate lock lever position, ensuring the operator is alerted to the machine's status and enabling appropriate responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operation is disabled when seat belt is not worn, then safety is improved, but operability deteriorates when seat belt sensor is damaged
Solution Approach 1:
The patent introduces a gate lock lever as an intermediary mechanism between the seat belt sensor and the operating levers. When the seat belt is not detected, instead of directly disabling operations, the system locks the gate lock lever which then prevents operation lever input. This intermediary approach maintains safety while allowing the system to distinguish between intentional gate locking and sensor failures.
Solution Approach 2:
The patent implements dynamic control where the warning behavior changes based on the gate lock lever position. When the gate lock lever is at the lock position, no warning is given even if seat belt is not worn. When at the lock release position, warnings are provided. This dynamic adjustment allows the system to adapt its safety enforcement based on the current operational state, preventing false disabling due to sensor errors.
2Reliability
If operation is disabled when seat belt is not worn, then safety is improved, but machine usability worsens due to non-operational situations
Solution Approach 1:
The gate lock lever serves as a mediator that provides contextual information to the control unit. This allows the system to differentiate between cases where the operator intentionally locked the gate (perhaps during maintenance or setup) versus cases where the seat belt sensor may be malfunctioning. The intermediary mechanism prevents unnecessary operational disruptions while maintaining safety protocols.
Solution Approach 2:
The system continuously monitors the gate lock lever position and uses this feedback to adjust its warning and disabling behavior. When the gate lock lever is detected at the lock position, the control unit suppresses warnings and allows operation. This feedback loop ensures that the safety system adapts to the actual operational context, preventing false positives that would reduce productivity.
3Reliability
If warning is given based on seat belt detection, then safety alerting is improved, but false warnings occur when gate lock lever is at lock position
Solution Approach 1:
The warning system dynamically adjusts its behavior based on the gate lock lever position. The control unit is programmed to suppress warnings when the gate lock lever is detected at the lock position, and to activate warnings when the lever is at the lock release position. This dynamic condition-based approach eliminates false warnings while maintaining effective safety alerting when operations are permitted.
Solution Approach 2:
The control unit continuously receives feedback from the gate lock lever position sensor and adjusts the warning output accordingly. This closed-loop feedback mechanism ensures that warnings are only generated when both the seat belt is not detected AND the gate lock lever is in the lock release position, preventing false alarms that would occur if warnings were given unconditionally.
Data Source
AI summary
A safety device for a construction machine includes a status information acquisition section that acquires status information pertaining to the status of the construction machine, a seat belt detection section that detects whether an operator is wearing a seat belt, and a control section that controls a warning section so that a warning is given on the basis of the status information when the operator is not wearing the seat belt, in which the status information includes information pertaining to the operation position of a gate lock lever that is manipulated to a lock position in which instructions from operating levers of the construction machine are disabled and a lock release position in which instructions from the operating levers are enabled, and the control section controls the warning section so that a warning is given when the gate lock lever operation position is at the lock release position.