Flow rate measuring apparatus
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United States of America Patent
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Aug 24, 2004
Grant Date -
Jul 26, 2001
app pub date -
Jan 24, 2001
filing date -
Jan 26, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A flow rate measuring apparatus capable of accurately measuring a flow rate of fluctuating fluid. A mode setting circuit selectively sets any one of a plurality of predetermined transmission modes different in transmission timing. The mode setting circuit sets any one of a first transmission mode which permits an ultrasonic wave to be transmitted at a predetermined timing for every period of a flow waveform of exhaust gas, a second transmission mode which permits an ultrasonic wave to be transmitted at a timing shifted by a predetermined time for every period of the flow waveform of the exhaust gas and a third transmission mode which permits an ultrasonic wave to be transmitted at predetermined intervals.
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