Flow rate measuring apparatus

摘要

A change in the amplitude of the output of a vortex sensor is sensed. When the change exceeds a predetermined value in the region of high engine load, the coefficient of smoothing applied to the output of the vortex sensor is switched to another value, or alternatively the intake air flow rate based on the engine speed is used, thereby providing a value for the flow rate of the intake air having excellent accuracy over the whole range of engine load.