COUNTER AND A REVOLUTION STOP DETECTION APPARATUS USING THE COUNTER

Title:

COUNTER AND A REVOLUTION STOP DETECTION APPARATUS USING THE COUNTER

Document Type and Number:

WIPO Patent Application WO/1997/014044

Kind Code:

A1

Abstract:

A counting device having an excellent fail-safe function. According to a first invention, a counter (1) counts pulse signals (P1) to be counted and then counts the cycles of a high-frequency signal (P2). When the frequency of the high-frequency signal (P2) is a predetermined value, a frequency judging circuit (30) generates a judgement signal representing that the counter is normal. According to a second invention, a counter (100) is preset by a preset signal, the counter resetting is confirmed based on the output of a self-hold circuit (102), and another self-hold circuit (104) generates a count output. According to a third invention, such a counting device is used as a timer circuit (203, 300, 400) to determine the rate of generation of the revolution detection pulse signal (Ip) generated based on a sensor signal, thereby detecting the stop of revolution of a rotating body.

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Inventors:

SAKAI MASAYOSHI (JP)
FUTSUHARA KOICHI (JP)

Application Number:

PCT/JP1996/002229

Publication Date:

April 17, 1997

Filing Date:

August 07, 1996

Export Citation:

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Assignee:

NIPPON SIGNAL CO LTD (JP)
SAKAI MASAYOSHI (JP)
FUTSUHARA KOICHI (JP)

International Classes:

G01D3/08; G01D5/244; G01P3/489; G01P13/00; G01P21/00; G01P21/02; G01R31/3185; (IPC1-7): G01R23/10

Foreign References:

JPS51154148U	1976-12-08
JPS54103665A	1979-08-15

Other References: