Gyro Sensor Resonance Frequency Tuning for Angle Detection
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Solution Overview
Problem
Gyro sensors face challenges in achieving high accuracy for angle detection due to difficulties in coinciding resonance frequencies and maintaining continuous measurement over long periods, especially with manufacturing variations and temperature changes.
Innovation Solution
The gyro sensor system adjusts the first and second resonance frequencies by controlling the spring constants using electrostatic attraction, allowing for direct rotation angle acquisition by monitoring the amplitude of vibration in the y-direction, and incorporates a damping coefficient adjustment mechanism to maintain measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If angular velocities are integrated to detect angle, then angle detection can be performed, but sufficient angle detection accuracy is not obtained
Solution Approach 1:
The patent replaces the conventional integration method with a direct angle detection method using a Foucault pendulum mechanism. The movable body suspended by a suspension mechanism directly indicates the angle through its position, eliminating the need for integration and thereby achieving both high accuracy and reliability in angle detection.
2Measurement precision
If resonance frequencies are not coincided due to manufacturing variations and temperature changes, then device complexity increases for adjustment, but direct angle detection with high accuracy becomes difficult
Solution Approach 1:
The patent employs a variable capacitor connected to the movable body to adjust its resonance frequency. By changing the capacitance value, the resonance frequency of the movable body can be tuned to coincide with the reference frequency, thereby achieving accurate angle detection without complex mechanical adjustment mechanisms.
3Duration of action of stationary object
If continuous measurement over long periods is required, then measurement stability is challenged by environmental changes, but measurement accuracy deteriorates
Solution Approach 1:
The patent incorporates a feedback mechanism where the detected angle information is used to adjust the resonance frequency of the movable body. This feedback loop compensates for drift caused by temperature changes and other environmental factors over long measurement periods, maintaining both measurement duration and accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy of angle detection by ensuring resonance frequency coincidence and adaptive adjustment to environmental changes, enabling continuous and precise measurement of rotation angles.
Implementation Method 1
a spring mechanism (112) which vibrates the movable body (111)
Implementation Method 2
adjusts the first resonance frequency and the second resonance frequency by controlling the spring constants using electrostatic attraction
Implementation Method 3
incorporates a damping coefficient adjustment mechanism to maintain measurement accuracy
Implementation Method 4
The detector detects an amplitude of vibration of the movable body wherein the vibration is due to a Coriolis force acting on the movable body
Data Source
AI summary
According to one embodiment, a gyro sensor system including a gyro sensor unit is disclosed. The unit includes a movable body, a spring mechanism, a detector, an adjuster, and a rotation angle acquisition unit. The spring mechanism vibrates the movable body. A detector detects an amplitude of vibration of the movable body due to Coriolis force. The adjuster adjusts a first resonance frequency of vibration of the movable body in free vibration and a second resonance frequency of vibration of the movable body due to Coriolis force on the movable body so that the first and second resonance frequencies are to coincide with each other based on the amplitude of the vibration due to Coriolis force. The rotation angle acquisition unit acquires a rotation angle of the movable body, based on the amplitude of the vibration due to Coriolis force.