Temperature Threshold Setting for Accurate Abnormality Detection

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Solution Overview

Problem

Existing temperature threshold determination methods for detecting temperature abnormalities in apparatuses are inadequate as they rely solely on standard deviation without considering a reference temperature value, leading to inappropriate threshold settings during high temperatures or small temperature variations.

Innovation Solution

A temperature threshold determining device that calculates a representative temperature value from historical temperature data and uses a preset reference temperature value to determine appropriate temperature thresholds, ensuring accurate detection of temperature abnormalities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If temperature threshold is determined using only standard deviation of measurement values, then the determination method is simple, but the threshold becomes inappropriate under high temperature conditions or small temperature variations

Engineering Contradiction:

Improvethreshold determination methodVSAvoidtemperature threshold accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent changes the parameters used for threshold determination from solely statistical parameters (standard deviation) to include both statistical parameters and physical reference parameters (reference temperature value). This allows the threshold to be appropriately adjusted based on actual temperature conditions while maintaining a systematic determination approach.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a reference temperature value as an intermediary parameter that mediates between the statistical variation (standard deviation) and the actual temperature threshold. This reference value serves as a baseline that prevents the threshold from becoming inappropriate under extreme or stable temperature conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If temperature threshold is determined without reference temperature value, then the calculation is simpler, but temperature abnormalities cannot be accurately detected under high temperatures or small variations

Engineering Contradiction:

Improvethreshold calculation processVSAvoidtemperature abnormality detection accuracy

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent adds the reference temperature value parameter to the threshold determination formula, transforming it from a purely statistical calculation to a hybrid calculation that incorporates physical temperature references. This enhances reliability without significantly complicating the calculation process.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The reference temperature value is predetermined and stored before the threshold determination is performed. This preliminary preparation allows the system to quickly and reliably determine thresholds by combining the pre-stored reference value with real-time statistical measurements, rather than calculating everything from scratch each time.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If standard deviation alone is used for threshold determination, then the method is more adaptable to different temperature ranges, but it fails when temperature variations are small or baseline temperature is high

Engineering Contradiction:

Improvetemperature threshold methodVSAvoidabnormality detection precision

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent transforms the threshold determination from using only relative statistical parameters (standard deviation) to using both relative statistical parameters and absolute physical parameters (reference temperature value). This dual-parameter approach maintains adaptability across different temperature ranges while ensuring precision in detecting actual abnormalities.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12298190B2Temperature threshold determining device, temperature abnormality determining system, temperature threshold determining method

Publication Date: 2025.05.13 OMRON CORP

AI summary

The temperature threshold determining device includes a temperature data storage unit, a representative temperature value determining unit, and a temperature threshold determining unit. The temperature data storage unit stores temperature data that indicates the temperature of a target apparatus during past operation. The representative temperature value determining unit determines a representative temperature value of the target apparatus during the past operation, which is derived using the temperature data stored in the temperature data storage unit. The temperature threshold determining unit determines at least one temperature threshold by using the representative temperature value during the past operation and a reference temperature value that is preset and configured to prevent the temperature abnormality.