Patent ID: 7089788

Claim:
An intake air flow rate measuring device of an internal combustion engine, comprising a measurement structure that is attached to an intake pipe of the internal combustion engine so as to project into an intake passage and measures an intake air flow rate of the internal combustion engine, the measurement structure including: an air inlet located in the intake passage on an upstream side; an air outlet located in the intake passage on a downstream side; a first passage extending from the air inlet to the air outlet; a shunt plate extending in a direction that crosses an axis of the intake passage and having a bottom edge that is adjacent to the first passage; a second passage formed around the shunt plate to bypass the first passage; and an air flow rate measuring element disposed in the second passage, wherein the bottom edge of the shunt plate is located on or above an imaginary line in which the imaginary line is parallel to the axis of the intake passage and passing through an uppermost edge of the air inlet.