Revolution speed detecting apparatus for extracting signal corresponding to revolution speed
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United States of America Patent
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-
May 7, 2002
Grant Date -
N/A
app pub date -
Jul 26, 2000
filing date -
Jul 26, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Through differentiation of input signal Vw from a sensor the angular frequency .omega. becomes included in the amplitude component. Through a plurality of differential operations the amplitude including the angular frequency .omega. varies, but the time-dependent term becomes equal. Since the amplitude of the signal Vw outputted from the revolution speed sensor 10 is approximately constant, the angular frequency .omega. proportional to the revolution speed can be extracted by determining a ratio thereof.
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