Anomaly detection device, anomaly detection method, and anomaly detection system
The abnormality determination device uses resistance and power values from voltage and current to detect heater abnormalities through low-pass filtering and target value settings, improving detection accuracy without temperature sensors.
JP7868378B2Active Publication Date: 2026-06-02OMRON CORP
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- OMRON CORP
- Filing Date
- 2022-03-31
- Publication Date
- 2026-06-02
AI Technical Summary
Technical Problem
Existing heater abnormality determination systems lack accuracy in detecting abnormalities without temperature sensors, as they rely solely on electrical resistance changes which can be influenced by temperature variations.
Method used
An abnormality determination device that calculates resistance and power values from voltage and current, using low-pass filtering and setting target values based on maintained power and resistance states to determine heater abnormalities.
Benefits of technology
Accurately detects heater abnormalities without relying on temperature information, enhancing detection precision and reliability.
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Smart Images
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Abstract
To provide an abnormality determination device capable of more accurately determining abnormality of a heater without using temperature information of the heater.SOLUTION: An abnormality determination device includes an acquisition unit for acquiring a resistance value and a power value of an electric heating element calculated from a voltage across the electric heating element of the heater and a current flowing through the electric heating element, a first determination unit for determining based on the acquired resistance value whether the heater is abnormal, and a second determination unit for determining whether the acquired power value is in a power settled state in which it is within a range of the first target value. The first determination unit performs abnormality determination based on the acquired resistance value when the second determination unit determines that the acquired power value has been in the power settled state during a first period.SELECTED DRAWING: Figure 6
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