Claims
- 1. An angular velocity sensor comprising:
a sensor including a vibrator and a detector for detecting an angular velocity; a drive unit including a driver circuit and a monitor circuit, wherein said driver circuit supplies a driving signal to the vibrator part of said sensor, and said monitor circuit receives a monitor signal from said sensor; a detection unit including an amplifier unit and a synchronous demodulator, wherein said amplifier unit receives outputs from the detector of said sensor and wherein said synchronous demodulator sample-holds an output from said amplifier unit in synchronous with the driving signal from said drive unit and outputs an angular velocity signal; and a self diagnosis unit which provides a diagnosis signal to detect an abnormality of said sensor by providing a displacement signal synchronized with said driving signal to said detection unit.
- 2. An angular velocity sensor according to claim 1, wherein said self diagnosis unit comprises an attenuator for attenuating said signal synchronized with said driving signal to generate said displacement signal, and an injector for providing said displacement signal from said attenuator to said detection unit.
- 3. An angular velocity sensor according to claim 2, further including a changing unit for changing said self diagnosis unit to either a working state or a non-working state, said changing unit being disposed between said attenuator and said injector.
- 4. An angular velocity sensor according to claim 3, further including a judge unit for continuously judging an abnormality of said sensor by detecting an output level of said detection unit during the non-working state of said self diagnosis unit.
- 5. An angular velocity sensor according to claim 3, wherein said changing unit is a switch for connecting or disconnecting, in accordance with an external control mechanism, said displacement signal to said injector.
- 6. An angular velocity sensor according to claim 3, wherein said changing unit comprises a timer circuit for connecting or disconnecting for a given time, in accordance with an external control mechanism, said displacement signal to said injector.
- 7. An angular velocity sensor according to claim 2, wherein said injector comprises a capacitor.
- 8. An angular velocity sensor according to claim 2, wherein said injector comprises a resistor.
- 9. An angular velocity sensor according to claim 2, wherein said attenuator includes a ladder network resistor capable of digitally adjusting at least one of an amplitude and phase of an input signal.
- 10. An angular velocity sensor according to claim 11, further including a balancing unit, wherein said balancing unit is disposed at an input terminal of one of said pair of charging amplifiers or current amplifiers and said input terminal is not connected to said injector, whereby said balancing unit maintains a balance of input characteristics between each of said pair of charging amplifiers or current amplifiers.
- 11. An angular velocity sensor according to claim 2, wherein said amplifier unit comprises one of a pair of charging amplifiers or a pair of current amplifiers.
Priority Claims (3)
Number |
Date |
Country |
Kind |
07-131351 |
May 1995 |
JP |
|
08-086189 |
Apr 1996 |
JP |
|
PCT/JP96/01445 |
May 1996 |
WO |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a Continuation-In-Part of U.S. patent application Ser. No. 09/811,786 filed on Mar. 20, 2001, which is a Continuation-In-Part of U.S. patent application Ser. No. 09/332,162 filed on Jun. 14, 1999, which is a divisional of U.S. patent application Ser. No. 08/776,443, filed on Apr. 17, 1997.
Divisions (1)
|
Number |
Date |
Country |
Parent |
08776443 |
Apr 1997 |
US |
Child |
09332162 |
Jun 1999 |
US |
Continuation in Parts (2)
|
Number |
Date |
Country |
Parent |
09811786 |
Mar 2001 |
US |
Child |
10300937 |
Nov 2002 |
US |
Parent |
09332162 |
Jun 1999 |
US |
Child |
09811786 |
Mar 2001 |
US |