| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To protect a gas sensor, which is provided in an intake pipe of an internal combustion engine, against a thermal shock of condensed water contained in intake air, and to keep gas component detection accuracy high. <P>SOLUTION: An air-fuel ratio sensor 10 is mounted on a vertical pipe wall 30 of an intake manifold. A detection part 18 of the air-fuel ratio sensor 10 is protrusively arranged in an intake channel. A plurality of ring-shaped recessed grooves 36 and 37 are engraved on the inner walls of the vertical pipe walls 30 on the intake upstream side and intake downstream side of the detection part 18, respectively. The ring-shaped recessed groove 36 inhibits a water droplet w, which adheres to the inner wall of the vertical pipe wall 30 on the intake upstream side of the detection part 18, from advancing toward the detection part 18. The ring-shaped recessed groove 37 inhibits the water droplet w, which flows down from the upper vertical pipe wall 30, from flowing down. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
