| 摘要 |
PURPOSE:To reduce the generation of noise, by a method wherein, when a swirl control valve provided on a suction port is actuated, actuation is delayed during transfer of an engine from a state in that a swirl is produced during low rotation low load running to a state in that a swirl is produced during high rotation high load running. CONSTITUTION:A straight port 7a having a swirl port 7b and an on-off valve 8 is provided on a suction port 3, and on-off valve 8 is driven for opening and closing by switching and controlling a negative pressure fed to a negative pressure chamber 9b of a negative pressure actuator 9 by means of a 3-way valve 10. During low rotation low load running of an engine, the on-off valve 8 is closed, and a swirl is produced in a combustion chamber 2 by means of an intake air current from the swirl port 7b. When the on-off valve 8 is opened during a time between this state and high rotation high load running, it is opened in delay than a change in running of an engine, and a swirl region is increased to prevent the generation of noise.
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