Inertial Sensor Range Setting via Cross-Axis Prediction
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Solution Overview
Problem
Existing inertial sensors face challenges in accurately detecting physical quantities like acceleration and angular velocity due to limited range adjustment based solely on detected values, leading to delayed tracking and decreased accuracy, especially when dealing with rapid changes or large motions in three-dimensional space.
Innovation Solution
The inertial sensor employs a range setting unit that adjusts the detection range of physical quantities by considering both first and second physical quantities, using information from multiple sensors and attitude calculation to predict input magnitudes and set appropriate dynamic ranges, thereby enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the detection range is set based on only the identified physical quantity, then the device complexity is reduced, but the measurement precision deteriorates
Solution Approach 1:
The range setting unit performs preliminary range setting based on prediction information from other physical quantities before actual detection occurs. This allows the detection range to be pre-adjusted according to predicted motion states, ensuring high detection accuracy without requiring complex real-time adjustment mechanisms during detection.
Solution Approach 2:
The patent introduces prediction information from other physical quantities as an intermediary to set the detection range. Instead of directly using the detected physical quantity to set its own range (which would require complex feedback loops), the system uses related physical quantities (e.g., using angular velocity prediction to set acceleration detection range) as mediators, simplifying the control mechanism while improving accuracy.
2Loss of time
If the detection range is set based on only the identified physical quantity, then the response time is reduced, but the productivity deteriorates
Solution Approach 1:
The system performs range setting in advance based on prediction information from other physical quantities before the actual detection is needed. This preliminary action eliminates tracking delay by pre-configuring the appropriate detection range according to predicted motion states, while maintaining high detection speed through straightforward detection processes without complex real-time adjustments.
Data Source
AI summary
An inertial sensor according to the embodiment includes a first sensor, a first detection circuit, a second sensor, a second detection circuit, and a range setting unit. The first sensor detects a first physical quantity on a first axis. The first detection circuit outputs first detection information based on a first sensor signal from the first sensor. The second sensor detects a second physical quantity on a second axis. The second detection circuit outputs second detection information based on a second sensor signal from the second sensor. The range setting unit performs range setting processing of setting a detection range of the first physical quantity in the first detection circuit based on the first detection information and the second detection information.