Oscillation Gyro Sensor Drive Signal Control for Sensitivity
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Solution Overview
Problem
Oscillation type gyro sensors face challenges in maintaining detection sensitivity and reliability, particularly when downsized and exposed to varying temperatures, as their characteristics change, leading to reduced performance.
Innovation Solution
The implementation of an oscillation type gyro sensor with an oscillation gyro device, an oscillation circuit, a controller, and an impedance conversion circuit, which monitors and controls the drive signal to maintain constant output, enhancing detection sensitivity and reliability by optimizing the sharpness (Qm) of the oscillation gyro device and protecting the piezoelectric member from electrostatic discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the oscillation type gyro sensor is downsized and the oscillator is made lighter, then the device size is reduced, but the detection sensitivity is deteriorated
Solution Approach 1:
The patent applies parameter changes by monitoring the drive signal parameters (voltage amplitude, frequency) and adjusting them to maintain optimal oscillation conditions. The sharpness Qm monitoring enables dynamic parameter adjustment to compensate for the reduced mass effect, thereby maintaining detection sensitivity despite downsizing.
Solution Approach 2:
The patent implements feedback mechanisms by monitoring the drive signal and sharpness Qm, then using this information to control and adjust the oscillation parameters. This closed-loop feedback system ensures that detection sensitivity is maintained even when the oscillator mass is reduced through downsizing.
2Device complexity
If the drive signal has a constant value, then the circuit configuration is simple, but the detection sensitivity changes with temperature
Solution Approach 1:
The patent uses feedback control by monitoring the drive signal characteristics and adjusting them based on temperature variations. The sharpness Qm monitoring provides feedback information that enables the system to maintain constant detection sensitivity despite temperature changes, preventing drift in sensor output.
Solution Approach 2:
The patent transitions from a static constant drive signal to a dynamic adjustable drive signal. The drive signal parameters can be dynamically modified in response to temperature changes and sharpness Qm variations, allowing the system to adapt and maintain optimal performance across different operating conditions.
3Ease of operation
If the oscillation gyro device is monitored directly, then the measurement is straightforward, but the piezoelectric member may be damaged by electrostatic discharge
Solution Approach 1:
The patent introduces an intermediary monitoring approach by measuring the drive signal characteristics and sharpness Qm indirectly rather than directly contacting the piezoelectric member. This intermediary measurement method enables monitoring of oscillation conditions without creating electrostatic discharge paths that could damage the sensitive piezoelectric element.
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 solution achieves higher detection sensitivity that is independent of temperature characteristics and improves the reliability of the oscillation type gyro sensor, allowing for enhanced performance in downsized applications while preventing damage from electrostatic discharge.
Implementation Method 1
a piezoelectric element that detects the Coriolis force that occurs due to an influence of an angular velocity
Implementation Method 2
a piezoelectric element that detects the Coriolis force that occurs due to an influence of an angular velocity so as to detect the angular velocity
Data Source
AI summary
There is provided an oscillation type gyro sensor including an oscillation gyro device, an oscillation circuit, a controller, and an impedance conversion circuit. The oscillation gyro device includes a piezoelectric device including a drive electrode and a detection electrode, oscillates according to a drive signal input to the drive electrode, and is capable of generating an output signal including a detection signal corresponding to a Coriolis force from the detection electrode. The oscillation circuit outputs, based on the output signal, a signal for oscillating the oscillation gyro device to the drive electrode as the drive signal. The controller controls the oscillation circuit such that the oscillation circuit outputs a drive signal that makes the output signal constant. To the impedance conversion circuit, the drive signal output from the oscillation circuit is input.