Acceleration sensor

Details Acceleration sensor Acceleration sensor

1996-10-02

1998-03-31

Williams, Hezron E.

Measuring and testing

Instrument proving or calibrating

Dynamometer

73 138, 7351434, G01L 2500, G01P 1509

Patent

active

057340870

ABSTRACT:
An acceleration sensor includes a piezoelectric ceramic element (1) for detecting acceleration, a signal processing circuit (2) for processing an output signal received from the piezoelectric ceramic element (1), and a self-diagnosing circuit (20) which is connected in series with the piezoelectric ceramic element (1). The self-diagnosing circuit (20) is provided with a PNP transistor having an emitter (E) which is connected to a source voltage V.sub.cc, a base which is supplied with an externally inputted timing pulse signal, and a collector for outputting a failure diagnosing signal which is synchronized with the timing pulse signal. Further, a self-diagnosing capacitor (25) is provided between the collector of the PNP transistor (23) and the piezoelectric ceramic element (1).

REFERENCES:
patent: 3786348 (1974-01-01), Lynas et al.
patent: 4537065 (1985-08-01), Ootsuka et al.
patent: 4816743 (1989-03-01), Harms et al.
patent: 4950914 (1990-08-01), Kurihara et al.
patent: 5004985 (1991-04-01), Holroyd et al.
patent: 5438859 (1995-08-01), Yamashita et al.
European Search Report dated Oct. 27, 1995.
"Electronics Engineer's Reference Book", Sixth Edition, Edited by FF Mazda 1989, pp. 33/7-33/8; 37/9-37/12.

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