Inertial Sensor Temperature Correction With Segmented Polynomials

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Solution Overview

Problem

Existing technologies struggle to accurately correct the complex temperature characteristics of inertial sensors, which can result in significant variations in output values due to temperature changes, especially in specific temperature zones.

Innovation Solution

A method and apparatus that divide the use temperature zone into multiple ranges and apply a multi-order approximation expression within each range to derive correction values, using an inertial sensor, temperature sensor, storage unit, and arithmetic processing unit to accurately correct the output values based on stored temperature characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single multi-order approximation expression is used to correct temperature characteristics, then the correction method is simple, but the correction accuracy deteriorates when the temperature characteristic changes rapidly in specific zones

Engineering Contradiction:

Improvecorrection method complexityVSAvoidtemperature characteristic correction accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The use temperature zone is divided into multiple temperature ranges, and a separate multi-order approximation expression is derived for each range. This segmentation allows each expression to accurately model the temperature characteristics within its specific range, improving overall correction accuracy while maintaining manageable complexity through systematic division of the temperature domain

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If the temperature characteristic is modeled with high complexity to capture rapid changes, then the correction accuracy improves, but the difficulty of deriving and applying the correction increases

Engineering Contradiction:

Improvetemperature characteristic correction accuracyVSAvoidcorrection derivation and application complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The temperature characteristic is segmented into multiple ranges, with each range having its own approximation expression. This reduces the complexity of deriving and applying corrections by breaking down the complex overall problem into simpler sub-problems, while still capturing rapid changes through localized high-order polynomials in critical temperature zones

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The order and coefficients of the approximation expressions are adjusted based on the specific characteristics of each temperature range. By changing the polynomial order and parameters locally rather than using a fixed high-order model everywhere, the system achieves high accuracy where needed while maintaining simpler models where the temperature characteristic is stable

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250327670A1Temperature Characteristic Correction Method, Temperature Characteristic Correction Apparatus, And Sensor Device

Publication Date: 2025.10.23 SEIKO EPSON CORP

AI summary

A sensor device includes an inertial sensor, a temperature sensor that detects a temperature of the inertial sensor, a storage unit that stores a temperature characteristic indicating a relationship between the temperature and an output value of the inertial sensor in each of a plurality of temperature ranges, and an arithmetic processing unit that derives a correction value for correction of the output value of the inertial sensor based on the temperature characteristic in the temperature range including the temperature detected by the temperature sensor and corrects the output value using the correction value.