Operator Detection Anomaly Diagnosis via Seat Switch Timing
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Solution Overview
Problem
Existing anomaly diagnosis systems for operator detection devices in industrial vehicles are overly complex and prone to misjudging normalcy, leading to incorrect diagnoses of anomalies when the operator is still seated, due to the requirement of multiple conditions being met for determining the operator's presence or absence.
Innovation Solution
An anomaly judgment system that includes an actuating switch and an anomaly judgment unit, which judges the operator detection device as anomalous if the actuating switch remains in an OFF state for a predetermined time period while the operator detection device is in an ON state, simplifying the diagnosis process by focusing on the ON/OFF states of the switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple conditions are monitored to determine operator presence (ignition switch position, ignition key removal, door operation, door-lock status), then the accuracy of operator status detection is improved, but the system complexity and diagnosis logic become overly complicated
Solution Approach 1:
The patent extracts the essential diagnostic function from the complex multi-condition monitoring system. Instead of analyzing multiple conditions (ignition switch, ignition key, door operation, door-lock), the system focuses solely on monitoring the seat switch signal and operator detection device status, simplifying the diagnosis logic while maintaining diagnostic capability
Solution Approach 2:
The patent inverts the traditional approach by not trying to positively confirm operator presence through multiple conditions, but rather by detecting anomaly when the operator detection device fails to respond appropriately to the seat switch signal. The system assumes normal operation and detects deviations from this norm, simplifying the logic structure
2Reliability
If the seat switch is diagnosed as final anomaly when the anomaly state continues for a predetermined time period, then the reliability of anomaly detection is improved, but false positive diagnoses occur when the operator is actually seated
Solution Approach 1:
The patent implements feedback by continuously monitoring whether the operator detection device responds to seat switch signals. The system compares the expected response (operator detection device should detect operator when seated) with actual response, and maintains anomaly diagnosis only when the discrepancy persists, preventing false positives from temporary mismatches
Solution Approach 2:
The patent performs preliminary verification by checking multiple conditions sequentially before finalizing the anomaly diagnosis. The system first detects the anomaly state, then verifies its persistence over time, and only then concludes final anomaly diagnosis, ensuring accuracy while maintaining reliability
Data Source
AI summary
An anomaly judgment system includes an actuating switch and an anomaly judgment unit for judging anomaly of an operator detection device that is turned into an ON state when detecting an operator in a vehicle. The actuating switch is operable to be turned into an ON state by the operator. The anomaly judgment unit judges the operator detection device as anomalous when a time period during which the actuating switch is in an OFF state with the operator detection device in the ON state exceeds a predetermined time period.