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Angular velocity detection circuit

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Angular velocity detection circuit


An angular velocity detection apparatus includes a vibrator that generates a signal that includes an angular velocity component and a vibration leakage component, a driver section that generates the drive signal, and supplies the drive signal to the vibrator, an angular velocity signal generation section that extracts the angular velocity component from the signal generated by the vibrator, and generates an angular velocity signal corresponding to the magnitude of the angular velocity component, a vibration leakage signal generation section that extracts the vibration leakage component from the signal generated by the vibrator, and generates a vibration leakage signal corresponding to the magnitude of the vibration leakage component, and an adder-subtractor section that adds the vibration leakage signal to the angular velocity signal, or subtracts the vibration leakage signal from the angular velocity signal, in a given ratio to correct temperature characteristics of the angular velocity signal.
Related Terms: Velocity

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USPTO Applicaton #: #20140174148 - Class: 73 137 (USPTO) -
Measuring And Testing > Instrument Proving Or Calibrating >Speed, Velocity, Or Acceleration

Inventors: Hideto Naruse, Kenji Sato, Yutaka Takada

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The Patent Description & Claims data below is from USPTO Patent Application 20140174148, Angular velocity detection circuit.

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This application is a continuation application of U.S. application Ser. No. 13/216,553 filed Aug. 24, 2011 which claims priority to Japanese Patent Application No. 2010-199791 filed on Sep. 7, 2010 all of which are hereby incorporated by reference in their entireties.

BACKGROUND OF THE INVENTION

The present invention relates to an angular velocity detection apparatus and an electronic instrument.

An electronic instrument or a system that includes an angular velocity detection apparatus, and performs a predetermined control process based on the angular velocity detected by the angular velocity detection apparatus has been widely used. For example, a vehicle travel control system prevents a side skid, or detects an overturn, based on the angular velocity detected by the angular velocity detection apparatus.

Such an electronic instrument or system performs wrong control if the angular velocity detection apparatus breaks down. Therefore, measures such as lighting an alarm lamp when the angular velocity detection apparatus has broken down have been employed. Various technologies that diagnose failure of the angular velocity detection apparatus have been proposed. For example, JP-A-2000-171257 focuses on the fact that a signal output from the vibrator of the angular velocity detection apparatus includes an angular velocity component, and a self-vibration component (vibration leakage component) based on excited vibrations of the vibrator, and discloses method that determines the presence or absence of failure of the angular velocity detection apparatus by extracting the vibration leakage component from the signal output from the vibrator, and monitoring the amplitude of the vibration leakage component. JP-A-2010-107416 discloses a failure diagnosis method that reliably generates a self-vibration component by tuning the balance so that the vibration energy of the vibrator becomes imbalanced.

It is ideal that a circuit that extracts the angular velocity component not to extract the vibration leakage component. However, a phase shift of a synchronous detection clock signal occurs due to a circuit production variation, so that the vibration leakage component is included in the extracted angular velocity signal (gyro signal). Therefore, if the vibration leakage component is enhanced as disclosed in JP-A-2010-107416, the temperature characteristics of the angular velocity signal deteriorate due to the effect of the temperature characteristics of the vibration leakage component. If the temperature characteristics of the vibration leakage component are indicated by a linear function or a quadratic function, the temperature characteristics of the vibration leakage component can be corrected using a small-scale temperature compensation circuit. However, the vibration leakage component has temperature characteristics indicated by a higher-order function. The circuit scale necessarily increases when correcting the temperature characteristics of the vibration leakage component using a higher-order function circuit.

SUMMARY

According to a first aspect of the invention, there is provided an angular velocity detection apparatus including:

a vibrator that generates a signal that includes an angular velocity component corresponding to the magnitude of an angular velocity, and a vibration leakage component of vibrations based on a drive signal;

a driver section that generates the drive signal, and supplies the drive signal to the vibrator;

an angular velocity signal generation section that extracts the angular velocity component from the signal generated by the vibrator, and generates an angular velocity signal corresponding to the magnitude of the angular velocity component;

a vibration leakage signal generation section that extracts the vibration leakage component from the signal generated by the vibrator, and generates a vibration leakage signal corresponding to the magnitude of the vibration leakage component; and

an adder-subtractor section that adds the vibration leakage signal to the angular velocity signal, or subtracts the vibration leakage signal from the angular velocity signal, in a given ratio to correct temperature characteristics of the angular velocity signal.

According to a second aspect of the invention, there is provided an electronic instrument including the above angular velocity detection apparatus.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

FIG. 1 is a diagram illustrating a configuration example of an angular velocity detection apparatus according to a first embodiment of the invention.

FIG. 2 is a diagram illustrating a vibrating element of a gyro sensor element.

FIG. 3 is a diagram illustrating the operation of a gyro sensor element.

FIG. 4 is a diagram illustrating the operation of a gyro sensor element.

FIG. 5 is a waveform diagram illustrating the angular velocity detection principle.

FIG. 6 is a waveform diagram illustrating the vibration leak detection principle.

FIGS. 7A to 7C are graphs illustrating an example of the temperature characteristics of an angular velocity signal and the temperature characteristics of a vibration leakage signal.

FIGS. 8A to 8C are graphs illustrating an example of the temperature characteristics of an angular velocity signal and the temperature characteristics of a vibration leakage signal.

FIG. 9 is a diagram illustrating a configuration example of an adder-subtractor circuit.

FIGS. 10A to 10D are graphs illustrating an example of correction of the temperature characteristics of an angular velocity signal according to the first embodiment.

FIGS. 11A to 11D are graphs illustrating an example of correction of the temperature characteristics of an angular velocity signal according to the first embodiment.

FIG. 12 is a graph illustrating an example of the temperature characteristics of an angular velocity signal and the temperature characteristics of a vibration leakage signal.

FIG. 13 is a diagram illustrating a configuration example of an angular velocity detection apparatus according to a second embodiment of the invention.

FIG. 14 is a diagram illustrating a configuration example of a first-order temperature adjustment circuit.

FIGS. 15A to 15F are graphs illustrating an example of correction of the temperature characteristics of an angular velocity signal according to the second embodiment.

FIG. 16 is a diagram illustrating a configuration example of an angular velocity detection apparatus according to a third embodiment of the invention.

FIGS. 17A to 17E are graphs illustrating an example of correction of the temperature characteristics of an angular velocity signal according to the third embodiment.

FIG. 18 is a diagram illustrating a configuration example of an angular velocity detection apparatus according to a fourth embodiment of the invention.

FIGS. 19A to 19F are graphs illustrating an example of correction of the temperature characteristics of an angular velocity signal according to the fourth embodiment.

FIG. 20 is a functional block diagram of an electronic instrument.

DETAILED DESCRIPTION

OF THE EMBODIMENT

The invention may provide an angular velocity detection apparatus and an electronic instrument that can compensate for a change in temperature characteristics of the angular velocity signal due to the vibration leakage component without using a higher-order temperature compensation circuit.

(1) According to one embodiment of the invention, there is provided an angular velocity detection apparatus including:

a vibrator that generates a signal that includes an angular velocity component corresponding to the magnitude of an angular velocity, and a vibration leakage component of vibrations based on a drive signal;

a driver section that generates the drive signal, and supplies the drive signal to the vibrator;

an angular velocity signal generation section that extracts the angular velocity component from the signal generated by the vibrator, and generates an angular velocity signal corresponding to the magnitude of the angular velocity component;

a vibration leakage signal generation section that extracts the vibration leakage component from the signal generated by the vibrator, and generates a vibration leakage signal corresponding to the magnitude of the vibration leakage component; and

an adder-subtractor section that adds the vibration leakage signal to the angular velocity signal, or subtracts the vibration leakage signal from the angular velocity signal, in a given ratio to correct temperature characteristics of the angular velocity signal.

The angular velocity signal generation section may extract the angular velocity component from the signal generated by the vibrator based on a first detection signal that is synchronized with the drive signal, for example. The vibration leakage signal generation section may extract the vibration leakage component from the signal generated by the vibrator based on a second detection signal that is synchronized with the drive signal and differs in phase from the first detection signal, for example.

According to the above embodiment, the temperature characteristics of the angular velocity signal can be corrected by adding the vibration leakage signal to the angular velocity signal, or subtracting the vibration leakage signal from the angular velocity signal, in a given ratio, on the assumption that the temperature characteristics of the angular velocity signal and the temperature characteristics of the vibration leakage signal have a correlation. This makes it possible to compensate for a change in temperature characteristics of the angular velocity signal due to the vibration leakage component without using a higher-order temperature compensation circuit.

(2) The above angular velocity detection apparatus may further include a first first-order temperature adjustment section that adjusts a first-order component of the temperature characteristics of the angular velocity signal input to the adder-subtractor section to approach a first value, and a second first-order temperature adjustment section that adjusts a first-order component of temperature characteristics of the vibration leakage signal input to the adder-subtractor section to approach a second value.

The first value and the second value may be selected based on the relationship between the temperature characteristics of the angular velocity signal and the temperature characteristics of the vibration leakage signal so that the temperature characteristics of the angular velocity signal are corrected by addition or subtraction by the adder-subtractor section. For example, the first value and the second value may be set to an identical value when the temperature characteristic curve of the angular velocity signal and the temperature characteristic curve of the vibration leakage signal bend similarly, and the adder-subtractor section may subtract the vibration leakage signal from the angular velocity signal in the given ratio. The first value and the second value may be set to values that differ in sign and have the same absolute value when the temperature characteristic curve of the angular velocity signal and the temperature characteristic curve of the vibration leakage signal bend in an opposite way, and the adder-subtractor section may add the vibration leakage signal to the angular velocity signal in the given ratio.

This makes it possible to implement a temperature compensation process on the angular velocity signal even when the first-order component of the temperature characteristics of the angular velocity signal and the first-order component of the temperature characteristics of the vibration leakage signal differ to a large extent.

(3) The above angular velocity detection apparatus may further include a first-order temperature adjustment section that adjusts one of a first-order component of the temperature characteristics of the angular velocity signal input to the adder-subtractor section and a first-order component of temperature characteristics of the vibration leakage signal input to the adder-subtractor section to approach the other of the first-order component of the temperature characteristics of the angular velocity signal and the first-order component of the temperature characteristics of the vibration leakage signal.

This makes it possible to implement a temperature compensation process on the angular velocity signal even when the first-order component of the temperature characteristics of the angular velocity signal and the first-order component of the temperature characteristics of the vibration leakage signal differ to a large extent.



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stats Patent Info
Application #
US 20140174148 A1
Publish Date
06/26/2014
Document #
14169575
File Date
01/31/2014
USPTO Class
73/137
Other USPTO Classes
International Class
01P21/00
Drawings
21


Velocity


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