| 摘要 |
PURPOSE:To prevent the malfunction of an air flowmeter by forming an expanding chamber on its midway of a communicating path communicating an intake path in the upstream of a throttle valve and a crank case. CONSTITUTION:A first communicating path 16 communicates an intake path 6 in the downstream of a throttle valve 8 and a crank case 3 through a PCV valve 17. A second communicating path 18 connects an intake path in the upstream of the throttle valve 8 and the downstream of an air flowmeter 10 and the crank case 3. An expanding chamber 20 is mounted on its midway of the communicating path 18. A blowby gas flows out to the communicating path 18 with a pressure rise in the crank case 3 on high-load operation. The blowby gas flows into the expanding chamber 20 once and a pulsation is absorbed, and passes through an intake path side section 18b and is forwarded to the downstream of the air flowmeter 10. Accordingly, the malfunction of the air flowmeter is prevented. |
