An air flow meter for an internal combustion engine comprises an intake air passage of an internal combustion engine, which is composed of a primary flow passage and an auxiliary flow passage having a specified length and a portion adapted to project within the primary flow passage and made substantially parallel to the direction of the air flow passing through the primary flow passage. A sensor for measurement of an intake air flowrate is disposed within the auxiliary flow passage. The primary flow passage is provided with a portion where the cross-sectional area of the primary flow passage is gradually reduced. In the vicinity of this cross-sectional area reducing portion, there is disposed an outlet of the auxiliary flow passage.
展开▼
