An Improved Driving Control Method for Micro-Machined Vibratory Gyroscope

Micro-machined vibratory gyroscope (MMVG) has been used in a wide range of consumer electronics, automotive and aerospace, due to miniaturization, mass production and other advantages. However, the performance and precision of MMVG are affected by the mechanical thermal noise, the Coriolis force of the driving mode coupled by the sensing mode, the quadrature error and the coupling damping. It is necessary to establish the more realistic gyroscope structural model and improve the closed-loop driving control. In this paper, the structural model of MMVG which can describe the mechanical thermal noise, the quadrature error and the coupling damping is proposed firstly. For the proposed gyroscope model, the closed-loop driving control based on the variable structure PID algorithm is applied to improve the performance of MMVG. The simulation results show that the variable structure PID controller can fulfill the requirements of the rapid start-up and the overshoot reducing. The control system can stabilize the amplitude and track the resonant frequency of the driving mode. It is important for the applications of MMVG.