| 摘要 |
<p>PURPOSE:To muffle air discharge sound without increasing intake pressure loss in the intake system of an engine with an intake compression device. CONSTITUTION:When a throttle valve 44 is suddenly closed during the operation of a turbocharger 14, an air by-pass valve 48 is opened, so that compressed intake air between the turbocharger 14 and the throttle valve 44 passes a communicating hose 46 and is discharged into an intake pipe 34 through an expansion chamber 30. The generation of turbo surge pressure is thereby prevented. The compressed intake air entering the expansion chamber 30 from the communicating hose 46 through a neck port 31 is expanded in the expansion chamber 30 and the pressure is lowered. The intake air lowered in pressure in the expansion chamber 30 is throttled at the time of passing a small hole 35 and being discharged into the intake pipe 34, so that the discharge quantity is damped, and air discharge sound is reduced. The expansion chamber 30 has a silencing effect on intake noise generated from the intake pulsation of an engine 10.</p> |
