Open-loop start-up method for a resonating device
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United States of America Patent
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Mar 13, 2007
Grant Date -
Dec 1, 2005
app pub date -
May 27, 2004
filing date -
May 27, 2004
priority date (Note) -
Expired
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Abstract
A system employing a resonating device and a controller implements a method involving an establishment by the controller of open-loop oscillations of the resonating device at a resonating frequency of the resonating device, and an establishment by the controller of closed-loop oscillations of the resonating device based on the open-loop oscillations of the resonating device at the resonating frequency. To this end, the controller controls an application and a tuning of a first open-loop drive signal to the resonating device based on a design-drive standard resonating frequency range whereby the controller can measure and designate a frequency of a resonating output signal from the resonating device as a calibration resonant frequency, and controls an application and a tuning of a second open-loop drive signal to the resonating device based on the calibration resonant frequency whereby the controller can subsequently apply a closed-loop drive signal to the resonating device.
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