PHYSICAL QUANTITY DETECTION APPARATUS, METHOD OF CONTROLLING PHYSICAL QUANTITY DETECTION APPARATUS, ABNORMALITY DIAGNOSIS SYSTEM, AND ABNORMALITY DIAGNOSIS METHOD
First Claim
1. A physical quantity detection apparatus that detects a given physical quantity, the physical quantity detection apparatus comprising:
- a physical quantity detection element that includes a drive electrode and a detection electrode, and vibrates based on a drive signal supplied to the drive electrode so that a physical quantity detection signal that corresponds to the magnitude of the physical quantity and a leakage signal of vibrations based on the drive signal flow through the detection electrode;
a driver section that generates the drive signal;
a synchronous detection section that performs a synchronous detection process on a detection target signal that includes the physical quantity detection signal and the leakage signal based on a detection signal that is synchronized with the drive signal; and
a timing change section that changes a relative timing of at least one of a rising edge and a falling edge of the detection signal with respect to the detection target signal based on a control signal so that at least part of the leakage signal is output by the synchronous detection process.
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Accused Products
Abstract
An angular velocity detection apparatus (i.e., physical quantity detection apparatus) includes a gyro sensor element (i.e., physical quantity detection element) that allows an angular velocity detection signal that corresponds to the magnitude of an angular velocity (i.e., physical quantity) and a leakage signal of vibrations based on a drive signal (square-wave voltage signal) to flow through a detection electrode, a driver circuit that generates the drive signal, a synchronous detection circuit that performs a synchronous detection process on a detection target signal that includes the angular velocity detection signal and the leakage signal based on a detection signal that is synchronized with the drive signal, and a phase change circuit that changes a relative timing of at least one of a rising edge and a falling edge of the detection signal with respect to the detection target signal based on a control signal so that at least part of the leakage signal is output by the synchronous detection process.
30 Citations
9 Claims
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1. A physical quantity detection apparatus that detects a given physical quantity, the physical quantity detection apparatus comprising:
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a physical quantity detection element that includes a drive electrode and a detection electrode, and vibrates based on a drive signal supplied to the drive electrode so that a physical quantity detection signal that corresponds to the magnitude of the physical quantity and a leakage signal of vibrations based on the drive signal flow through the detection electrode; a driver section that generates the drive signal; a synchronous detection section that performs a synchronous detection process on a detection target signal that includes the physical quantity detection signal and the leakage signal based on a detection signal that is synchronized with the drive signal; and a timing change section that changes a relative timing of at least one of a rising edge and a falling edge of the detection signal with respect to the detection target signal based on a control signal so that at least part of the leakage signal is output by the synchronous detection process. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling a physical quantity detection apparatus that includes a physical quantity detection element that includes a drive electrode and a detection electrode, and vibrates based on a drive signal supplied to the drive electrode so that a physical quantity detection signal that corresponds to the magnitude of a given physical quantity and a leakage signal of vibrations based on the drive signal flow through the detection electrode, a driver section that generates the drive signal, and a synchronous detection section that performs a synchronous detection process on a detection target signal that includes the physical quantity detection signal and the leakage signal based on a detection signal that is synchronized with the drive signal, the method comprising:
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causing the physical quantity detection apparatus to change a relative timing of at least one of a rising edge and a falling edge of the detection signal with respect to the detection target signal so that at least part of the leakage signal is output, and perform the synchronous detection process; and causing the physical quantity detection apparatus to generate a signal that corresponds to the leakage signal based on a signal output from the synchronous detection section.
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9. A method of controlling a physical quantity detection apparatus that includes a physical quantity detection element that includes a drive electrode and a detection electrode, and vibrates based on a drive signal supplied to the drive electrode so that a physical quantity detection signal that corresponds to the magnitude of a given physical quantity and a leakage signal of vibrations based on the drive signal flow through the detection electrode, a driver section that generates the drive signal, and a synchronous detection section that performs a synchronous detection process on a detection target signal that includes the physical quantity detection signal and the leakage signal based on a detection signal that is synchronized with the drive signal, the method comprising:
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causing the physical quantity detection apparatus to change a relative timing of at least one of a rising edge and a falling edge of the detection signal with respect to the detection target signal so that at least part of the leakage signal is output, and perform the synchronous detection process; and causing the physical quantity detection apparatus to determine presence or absence of an abnormality of the physical quantity detection apparatus based on a signal output from the synchronous detection section.
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Specification