ECU Voltage Monitoring with Anomaly Time Filtering
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Solution Overview
Problem
Existing ECU power supply voltage monitoring systems face challenges in accurately distinguishing between real faults and pseudo faults caused by temporary electrical issues, leading to false detections and inaccurate anomaly recordings.
Innovation Solution
A voltage monitoring device with a detector and monitoring processor that compares power supply voltage to a threshold, accumulates anomaly time, and determines anomalies based on predetermined thresholds, while also considering power generation states and disabling monitoring during unstable conditions to avoid false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage monitoring is performed continuously to detect all anomalies, then detection coverage is improved, but false detections increase due to transient power fluctuations
Solution Approach 1:
The system performs preliminary actions by accumulating anomaly time before making a final determination. When voltage anomalies occur, the system starts accumulating time and only triggers a fault determination when the accumulated time exceeds a threshold, preventing premature reactions to transient fluctuations
Solution Approach 2:
The patent introduces a time buffer mechanism that cushions against false detections. By requiring the anomaly to persist for a predetermined time period before triggering an alarm, the system creates a protective buffer that filters out transient power fluctuations and temporary electrical issues
2Measurement precision
If monitoring threshold is set low to detect minor anomalies, then detection sensitivity is improved, but false alarms increase due to normal voltage variations
Solution Approach 1:
The system accumulates anomaly time as a preliminary step before final determination. Even when voltage drops below the threshold, the system waits to see if the condition persists long enough to warrant a fault determination, preventing false alarms from temporary variations
3Speed
If anomaly determination is made immediately upon threshold violation, then response time is improved, but accuracy deteriorates due to transient fluctuations
Solution Approach 1:
The system performs preliminary accumulation of anomaly time before making the final determination. This preliminary action phase allows the system to quickly detect threshold violations while maintaining accuracy by requiring the condition to persist for a predetermined period
Data Source
AI summary
A method of monitoring a power supply voltage to an electronic control unit equipped with a vehicle by using a voltage monitoring device, comprising: detecting the power supply voltage to the electronic control unit; comparing the detected power supply voltage with a predetermined threshold value; accumulating an anomaly length of time during which the detected power supply voltage is lower than the predetermined threshold value; determining whether the accumulated anomaly length of time becomes a predetermined anomaly threshold time or more; and when it is determined that the accumulated anomaly length of time becomes the predetermined anomaly threshold time or more, determining that the anomaly occurs on the voltage monitoring device.