IMU Correction Parameter Switching for Narrow Detection Ranges

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Solution Overview

Problem

Existing inertial measurement units (IMUs) face low correction accuracy when the detection range of sensors is narrow, as they use a fixed correction parameter calculated from a maximum detection range.

Innovation Solution

The IMU includes a storage portion for multiple correction parameters, a parameter control portion to select the appropriate parameter based on the detection range, and a correction calculation portion to correct inertial information using the selected parameter, allowing for high-accuracy corrections across varying detection ranges.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a fixed correction parameter calculated from maximum detection range is used, then the device complexity is reduced, but the measurement precision deteriorates when detection range is narrow

Engineering Contradiction:

Improvecorrection parameter structureVSAvoidcorrection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The correction parameters are segmented into multiple sets, each corresponding to different detection ranges. The parameter control portion divides the detection range into multiple segments and selects the appropriate correction parameter set based on the current detection range, thereby improving measurement precision without excessive complexity increase.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The correction parameter selection is made dynamic based on the actual detection range. The parameter control portion automatically switches between different correction parameter sets according to the detection range, making the system adaptive rather than static, which resolves the contradiction between fixed structure and precision requirements.

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If multiple correction parameters are stored for different detection ranges, then the measurement precision is improved, but the device complexity increases

Engineering Contradiction:

Improvecorrection accuracyVSAvoidcorrection parameter structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Multiple correction parameters are pre-calculated and stored in the storage portion for different detection ranges. This preliminary preparation eliminates the need for complex real-time calculations, reducing operational complexity while maintaining high measurement precision through appropriate parameter selection.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the correction parameter values based on the detection range. By organizing parameters in a structured manner with clear correspondence to different ranges, the system manages complexity through parameter variation rather than structural complexity.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If a correction parameter calculated from maximum detection range is used, then the adaptability is reduced, but the ease of manufacture is improved

Engineering Contradiction:

Improvedetection range adaptationVSAvoidparameter configuration

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The correction parameter structure is designed to be universal across different detection ranges. A single set of correction parameters can serve multiple detection ranges by selecting the appropriate subset, making the system multi-functional and adaptable without requiring completely different parameter sets for each range.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12474363B2Inertial measurement unit

Publication Date: 2025.11.18 SEIKO EPSON CORP

AI summary

An inertial measurement unit includes an angular velocity sensor and an acceleration sensor that output inertial information, a storage portion that stores a plurality of correction parameters related to a range of values of the inertial information, a parameter control portion that selects a selection correction parameter from the plurality of correction parameters, and a correction calculation portion that corrects the inertial information using the selection correction parameter.