Operator Presence Detection Using Seat and Motion Signals
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Solution Overview
Problem
Existing operator presence systems in machinery fail to accurately detect when an operator is not seated during operation, potentially leading to damage to the machine, operator, or bystanders, due to complex operational hazards and false determinations.
Innovation Solution
A method and system that utilize onboard sensors and detection devices to provide visual and audible warnings when an operator is not seated, using a subset of inputs to prevent false hazards, and transmit notifications both inside and outside the cab to alert the operator and bystanders of potential danger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing operator presence systems monitor only seat switch status, then the system simplicity is maintained, but the detection accuracy deteriorates leading to false determinations
Solution Approach 1:
The patent combines multiple monitoring parameters (seat switch status, transmission output speed, and operational time thresholds) into a unified operator presence determination system. This multi-parameter approach resolves the contradiction by improving detection accuracy through cross-validation of signals while maintaining system simplicity through integrated processing logic that evaluates all parameters simultaneously rather than through complex sequential analysis.
Solution Approach 2:
The system establishes predetermined time thresholds and speed criteria before operation begins. By pre-setting these determination criteria, the system eliminates the need for complex real-time calculations, thereby maintaining simplicity while achieving accurate operator presence detection through comparison against pre-established benchmarks.
2Measurement precision
If the system uses multiple parameters for operator detection, then the detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies partial action by selectively evaluating specific parameters (seat switch, transmission speed, time threshold) rather than monitoring all possible machine parameters. This selective approach achieves sufficient detection accuracy for operator presence determination while avoiding the complexity of comprehensive multi-sensor integration, implementing just enough monitoring to solve the core safety problem.
3Reliability
If the system generates notifications for unseated operators, then the safety is improved, but the potential for additional hazards increases
Solution Approach 1:
The system implements feedback by continuously monitoring operator presence status and providing real-time notifications when the operator is unseated during operation. This closed-loop feedback mechanism improves safety by alerting operators to their unsafe position while simultaneously reducing potential hazards through the use of standardized, non-alarmist notification signals that inform without causing distraction or additional risk.
Data Source
AI summary
A technique is directed to methods and systems for detecting the presence of a machine operator. In some implementations, an operator presence system monitors a machine to determine whether an operator is present in an operating machine. The operator presence system collects input data from sensors or devices on the machine and determines whether the operator is in the operator seat. During operation, if an operator is determined to not be in the operator seat, the operator presence system can generate and send notifications (e.g., visual or audible warnings) to alert the operator to sit in the operator seat.