Coriolis Vibratory Gyroscope Digital Control System
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Solution Overview
Problem
Existing Coriolis vibratory gyroscope (CVG) control systems face challenges in accurately measuring rotation due to limitations in quadrature bias compensation and efficient digital control.
Innovation Solution
A CVG control system comprising a plurality of sensor controllers and a gyroscope controller, which generates sinusoidal forcer signals and monitors capacitive pickoff voltages to determine rotation, utilizing field-programmable gate arrays (FPGAs) and variable gain stages for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional CVG control systems use analog control methods, then the system structure is relatively simple, but the measurement precision and resolution are insufficient
Solution Approach 1:
The patent replaces traditional analog control methods with digital control using FPGAs. The system uses digital forcer signals generated by FPGAs to drive the resonator and digital processing of pickoff voltages to determine rotation, substituting analog electronics with digital signal processing to achieve higher precision while managing complexity through integrated digital architecture
Solution Approach 2:
The patent implements variable gain stages that can dynamically adjust the gain of pickoff voltage signals based on operating conditions. This allows the system to optimize measurement precision across different rotation rates and environmental conditions, transforming fixed-parameter analog systems into adaptive digital systems with可调 parameters
2Speed
If the system continuously monitors pickoff voltage and applies forcer signals simultaneously, then the control response is fast, but the energy consumption increases
Solution Approach 1:
The patent implements time-division multiplexing where the system alternates between sensing modes (monitoring pickoff voltage) and forcing modes (applying forcer signals). During each period, the system selectively activates either the forcer electrodes or the sensing circuitry, reducing simultaneous power consumption while maintaining responsive control through periodic measurement and actuation cycles
Solution Approach 2:
The patent maintains continuous rotation measurement capability through overlapping measurement windows and predictive algorithms. By processing data continuously in smaller intervals and using FPGA-based real-time processing, the system achieves fast response without requiring all components to operate at full power simultaneously, thus reducing energy consumption while maintaining effective control speed
3Adaptability or versatility
If the system uses multiple sensor controllers for different functions, then the functionality is enhanced, but the device complexity increases
Solution Approach 1:
The patent designs sensor controllers that can operate in multiple modes: forcer mode (generating drive signals), sensing mode (monitoring pickoff voltages), and rebalance mode (applying correction signals). The same hardware controller can be configured to perform different functions by changing the operational mode, eliminating the need for separate dedicated controllers for each function and reducing overall system complexity while maintaining enhanced functionality
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 system achieves high-resolution, efficient, and cost-effective rotation measurement by selectively switching between forcer and sensing modes, enabling accurate determination of rotation in harsh environments.
Implementation Method 1
providing a forcing signal to one or more electrodes to initiate an oscillatory motion of a resonator
Implementation Method 2
The CVG control system can monitor a pickoff voltage associated with pickoff electrodes (e.g., in a capacitive manner) to monitor the oscillatory motion of the resonator(s)
Implementation Method 3
initiate an oscillatory motion of a resonator, which can be vibrating tines of a tuning fork gyroscope
Data Source
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AI summary
A control system includes sensor controllers that are each coupled to a respective set of electrodes of a CVG sensor system via respective sensor channels. A first portion of the sensor controllers provides a sinusoidal forcer signal on the respective sensor channel in response to digital clock and feedback signals to provide oscillation of a resonator of the CVG sensor system. A second portion of the sensor controllers monitors a capacitive pickoff voltage associated with the resonator on the respective sensor channel to generate a digital pickoff signal. A gyroscope controller generates the digital feedback signal in response to the digital pickoff signal from the second portion of the sensor controllers to provide the digital feedback signal and the digital clock signal to the first portion of the sensor controllers and determines a rotation about the CVG sensor system based on the digital feedback signal or the digital pickoff signal.