Rotational speed detecting apparatus storing alternate informati

Details Rotational speed detecting apparatus storing alternate informati Rotational speed detecting apparatus storing alternate informati

1992-09-10

1993-11-23

Black, Thomas G.

Boots, shoes, and leggings

364569, 36443104, 324166, 377 20, G04F 1000, G01P 344

Patent

active

052650375

ABSTRACT:
A sensor generates a pulse signal at a predetermined angle of a rotating body. First and second registers respectively memorize both of a leading edge and a trailing edge of a divided signal of the pulse signal. The first resistor maintains the timing of the detected preceding leading edge until the next leading edge is detected so that the timing of the next leading edge is renewed when the next leading edge is detected. The second register maintains and renews the timing of the trailing edge in the same manner as the first register. The rotational speed is obtained by computing the time difference of each memorized timing at the start of such computing operation. Accordingly, an accurate rotational speed can be always obtained, even when the rotational speed computing operation is delayed by a high priority interrupt operation.

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