| 摘要 |
<p>PURPOSE:To enhance detection accuracy of a flow rate of a suction air and to execute the A/F control with high accuracy by discriminating an air flow in a casing in a normal direction or in a reverse direction. CONSTITUTION:First and second air passages 25, 26 which are symmetrical arrangement relative to a central axis O-O of a casing 22 are formed on detection head 24 projected in the casing 22. The air passages 25, 26 are in the shapes that taper in the directions opposite to the air flow directions (arrow directions A, B) which are inverted each other. In a way of each of the air passages 25, 26, first and second heating resisters 29, 30 and first and second heat sensitive resisters 31, 32 are provided via an insulating substrate consisting of a main substrate section 28A and a sub-substrate section 28B, respectively. A temperature compensation resister 33 is also provided in the way of the passage 25. Resistance values of the heating resisters 29, 30 and heat sensitive resisters 31, 32 are varied due to the air flows in each of the air passages 25, 26 so that a flow rate of the suction air is detected based on the variation of the resistance values.</p> |
