Device for measuring amount of engine suction air

Details Device for measuring amount of engine suction air Device for measuring amount of engine suction air

1988-03-11

1989-07-25

Levy, Stewart J.

Measuring and testing

Simulating operating condition

Marine

G01M 1900

Patent

active

048502189

ABSTRACT:
A measuring device for measuring an amount of suction air of an engine comprises a Karman vortex sensor disposed in an engine suction conduit, a low-pass filter for removing high frequency noise component from an output of the Karman vortex sensor, a first binarizing means for comparing an output of the low-pass filter with a predetermined value to provide a series of Karman vortex pulses, a second binarizing means for comparing the output of the sensor with a predetermined value to provide a series of Karman vortex pulses and a noise detector for comparing the number of pulses from the first binarizing means with that from the second binarizing means to judge an existence of high frequency noise of the output of the sensor, upon which a time constant of the low-pass filter is switched to exclude noise from the output of the Karman vortex sensor when a throttle opening of the engine is small.

REFERENCES:
patent: 4270391 (1981-06-01), Herzl
patent: 4457166 (1984-07-01), Kobayashi

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