Vibration-type angular velocity detector having sensorless temperature compensation
First Claim
1. A vibration-type angular velocity detector comprising:
- a vibration element;
a driving piezoelectric element for vibrating said vibration element;
a detecting piezoelectric element for outputting a signal corresponding to a vibration component crossing at a right angle t a vibrating direction of said vibration element when said vibration element is vibrated by said driving piezoelectric element;
a reference piezoelectric element for outputting a signal corresponding to said vibrating direction of said vibration element;
angular velocity signal output means for outputting an angular velocity signal based on an output signal of said detecting piezoelectric element;
feedback control means for outputting a driving voltage to said driving piezoelectric element in order to vibrate said vibration element at a fixed amplitude based on an output signal of said reference piezoelectric element; and
correction means, connected between said angular velocity signal output means and said feedback control means, for temperature-correcting said output angular velocity signal based on said output signal of said reference piezoelectric element.
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Accused Products
Abstract
A vibration-type angular velocity detector is for accurately correcting temperature-induced variations of an angular velocity signal without using a temperature sensor. A driving piezoelectric element, a detecting piezoelectric element and reference piezoelectric element are disposed on a vibration element. Using an output signal of the reference piezoelectric signal, a feedback control loop for applying driving voltage to the driving piezoelectric element is provided using an amplifier, a phase-shifting circuit, a rectifier, a reference voltage generator, a differential amplifier and a multiplier so as to vibrate the vibration element at a fixed amplitude. In addition, using an output signal of the detecting piezoelectric element at the time of vibrating the vibration element, an angular velocity signal is output. Here, the output voltage of the differential amplifier is a signal corresponding to the temperature of the vibration element. A correction signal is prepared by a correction signal preparing circuit using the differential amplifier output signal added to the angular velocity signal by a summer so that the temperature correction of the angular velocity signal is performed.
41 Citations
18 Claims
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1. A vibration-type angular velocity detector comprising:
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a vibration element; a driving piezoelectric element for vibrating said vibration element; a detecting piezoelectric element for outputting a signal corresponding to a vibration component crossing at a right angle t a vibrating direction of said vibration element when said vibration element is vibrated by said driving piezoelectric element; a reference piezoelectric element for outputting a signal corresponding to said vibrating direction of said vibration element; angular velocity signal output means for outputting an angular velocity signal based on an output signal of said detecting piezoelectric element; feedback control means for outputting a driving voltage to said driving piezoelectric element in order to vibrate said vibration element at a fixed amplitude based on an output signal of said reference piezoelectric element; and correction means, connected between said angular velocity signal output means and said feedback control means, for temperature-correcting said output angular velocity signal based on said output signal of said reference piezoelectric element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An angular velocity detector comprising:
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a vibration element; a driving element contacting said vibration element to impart vibrational force to said vibration element; a reference element contacting said vibration element for generating a first signal representative of a first vibration component of said vibration element corresponding to said vibrational force; a detecting element contacting said vibration element for generating a second signal representative of a second vibration component of said vibration element corresponding to a rotational component of said vibration element; feedback control means for, responsive to said first signal, driving said driving element at a given amplitude; angular velocity signal generating means for generating an angular velocity signal representative of angular velocity of said vibration element responsive to said second signal; and temperature compensation means connected between said angular velocity signal generating means and said feedback control means, for correcting said angular velocity signal responsive to said first signal to compensate for temperature-induced variations in said angular velocity signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A vibration-type angular velocity detector comprising:
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a vibration element; a driving piezoelectric element for vibrating said vibration element; a detecting piezoelectric element for outputting a signal corresponding to a vibration component crossing at a right angle t a vibrating direction of said vibration element when said vibration element is vibrated by said driving piezoelectric element; a reference piezoelectric element for outputting a signal corresponding to said vibrating direction of said vibration element; angular velocity signal output means for outputting an angular velocity signal based on an output signal of said detecting piezoelectric element; feedback control means for outputting a driving voltage to said driving piezoelectric element in order to vibrate said vibration element at a fixed amplitude based on an output signal of said reference piezoelectric element; and correction means for temperature-correcting said output angular velocity signal based on said output signal of said reference piezoelectric element using a correction detection signal selected from a plurality of signals having different fluctuation directions with respect to said temperature change of said vibration element.
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18. An angular velocity detector comprising:
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a vibration element; a driving element contacting said vibration element to impart vibrational force to said vibration element; a reference element contacting said vibration element for generating a first signal representative of a first vibration component of said vibration element corresponding to said vibrational force; a detecting element contacting said vibration element for generating a second signal representative of a second vibration component of said vibration element corresponding to a rotational component of said vibration element; feedback control means for, responsive to said first signal, driving said driving element at a given amplitude; angular velocity signal generating means for generating an angular velocity signal representative of angular velocity of said vibration element responsive to said second signal; and temperature compensation means for correcting said angular velocity signal responsive to said first signal to compensate for temperature-induced variations in said angular velocity signal using a correction detection signal selected from a plurality of signals having different fluctuation directions with respect to said temperature change of said vibration element.
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Specification