Patent Number: 6,167,744

Title: Angular velocity sensor and diagnosis system for this sensor

Abstract: A drive circuit supplies a FB (feedback) signal having a predetermined frequency to drive electrodes to vibrate a vibrator. An angular velocity detecting circuit detects a vibratory movement caused in a direction normal to an oscillating direction of the vibrator based on a sensing signal of angular velocity sensing electrodes, thereby generating an angular velocity signal. A signal input circuit supplies a diagnostic signal having a frequency different from that of the FB signal, which is entered into the vibrator via diagnosing electrodes. A diagnosis circuit generates a breakdown signal based on a signal responsive to the diagnostic signal which is obtained from at least one of the drive electrodes and the angular velocity sensing electrodes.

Inventors: Akimoto; Katsuhide (Yokkaichi, JP), Watarai; Takehiro (Mie-ken, JP), Kato; Kenji (Okazaki, JP), Miura; Kazuhiko (Yokkaichi, JP)

Assignee: Denso Corporation

International Classification: G01P 21/00 (20060101); G01C 19/56 (20060101); G01P 21/02 (20060101); G01P 021/00 ()

Expiration Date: 01/02/2018