Capacitance Angular Velocity Sensor Frequency Control
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Solution Overview
Problem
Capacitance type angular velocity sensors face issues with signal saturation due to rotational vibrations not subject to detection, caused by mistuned frequencies between the sensor's drive and detection frequencies, leading to inaccurate angular velocity detection.
Innovation Solution
A circuit device with a vibration frequency controller that variably controls the detection and drive frequencies of the capacitance type angular velocity transducer, accompanied by a storage system for correction parameters to adjust sensor characteristics, preventing signal saturation and ensuring accurate angular velocity detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mistuned frequency is changed by varying the drive or detection frequency, then the signal saturation problem is prevented, but the sensor characteristics change requiring circuit parameter adjustments
Solution Approach 1:
The patent pre-calculates and stores correction parameters (gain, offset, bandwidth) in a lookup table corresponding to different mistuned frequency values. When the drive or detection frequency is varied to prevent signal saturation, the system automatically retrieves the appropriate correction parameters from the pre-stored table, eliminating the need for real-time complex calculations and simplifying the control process.
Solution Approach 2:
The system continuously monitors the actual mistuned frequency and automatically selects the appropriate correction parameters from the pre-stored table based on the current frequency condition. This feedback mechanism ensures that the circuit parameters are always optimized for the current operating condition without requiring manual intervention or complex real-time computation.
2Device complexity
If the drive frequency or detection frequency is fixed, then the circuit parameters remain constant, but the sensor may experience signal saturation when mistuned frequency matches substrate resonant frequency
Solution Approach 1:
The patent enables dynamic adjustment of either the drive frequency or detection frequency to change the mistuned frequency. By making the frequency可调 (adjustable), the system can dynamically avoid resonance conditions with the substrate while maintaining stable operation. The frequency adjustment is performed based on pre-stored correction parameters, keeping the overall system control simple.
Solution Approach 2:
The system changes the operating frequency parameters (drive frequency or detection frequency) to alter the mistuned frequency and avoid substrate resonance. The patent provides a mapping between frequency parameters and correction parameters, allowing the system to adjust frequency while automatically compensating for characteristic changes through pre-stored correction values.
3Measurement precision
If the gain is increased to improve signal detection, then the detection sensitivity improves, but the signal saturates more easily when mistuned frequency is close to resonant frequency
Solution Approach 1:
The patent pre-calculates and stores optimal gain values in the correction parameter table corresponding to different mistuned frequency conditions. When operating at a specific mistuned frequency, the system retrieves the pre-determined gain value that maximizes detection sensitivity while avoiding saturation, eliminating the need for real-time gain optimization calculations.
Solution Approach 2:
The system uses the pre-stored correction parameters to automatically adjust the gain based on the actual mistuned frequency. This feedback mechanism ensures that the gain is always optimized for the current operating condition, maintaining high detection sensitivity while preventing signal saturation without requiring complex real-time control.
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
The solution effectively prevents signal saturation by adjusting mistuned frequencies and correcting sensor characteristics, thereby enhancing the accuracy of angular velocity detection.
Implementation Method 1
capacitance type angular velocity transducer
Implementation Method 2
a method of varying a voltage to be applied to the electrode to vary the effective stiffness (the effective spring constant) to thereby vary the natural frequency
Implementation Method 3
detection circuit adapted to detect angular velocity based on a detection signal from the angular velocity transducer
Data Source
AI summary
A circuit device adapted to perform detection of angular velocity observed by a capacitance type angular velocity transducer includes a drive device, a detection device, a vibration frequency controller adapted to variably control at least one of a detection frequency and a drive frequency of the capacitance type angular velocity transducer, and a storage adapted to store a correction parameter group adapted to correct a sensor characteristic of the capacitance type angular velocity transducer due to a variation of at least one of the detection frequency and the drive frequency.