APPARATUS FOR MEASURING THE AMOUNT OF THE AIR INTAKEN BY THE ENGINE.

摘要

A Karman's vortex street flow rate sensor (2) is provided in an air intake passage of the engine. A binary conversion circuit (3) produces Karman's vortex street pulses by converting the output of the sensor to binary values and pref. includes two (31,32) lowpass filters in series and a comparator (33) that compares their outputs. An element (7) effects variable setting of the binary conversion circuit's operating constant in accordance with engine operating states comprising at least the degree of opening of the engine's throttle valve (6).