초록 ▼

In order to improve air-fuel mixture uniformity and enhance charging efficiency during high engine speed operation and to obviate noise produced as hot exhaust gases flow at sonic velocity back into the induction system and the formation of carbon deposits which can induce valve “stick”, the inlet v

In order to improve air-fuel mixture uniformity and enhance charging efficiency during high engine speed operation and to obviate noise produced as hot exhaust gases flow at sonic velocity back into the induction system and the formation of carbon deposits which can induce valve “stick”, the inlet valve which controls the induction passage utilized during low engine speed operation is opened before the one which controls the induction passage which is rendered effective during high speed, and with an overlap with the exhaust valve.

대표청구항 ▼

In an internal combustion engine means defining a combustion chamber; an induction system leading to said combustion chamber; and an exhaust system leading from said combustion chamber, said exhaust system including an exhaust valve which controls communication between said combustion chamber and an

In an internal combustion engine means defining a combustion chamber; an induction system leading to said combustion chamber; and an exhaust system leading from said combustion chamber, said exhaust system including an exhaust valve which controls communication between said combustion chamber and an exhaust passage; said induction system comprising: a first induction passage which communicates with said combustion chamber via a first inlet valve, said first inlet passage being arranged to introduce air into said combustion chamber in a manner which establishes a swirling air pattern in said combustion chamber; a second induction passage which communicates with said combustion chamber via a second inlet valve; a flow control valve disposed in said second induction passage, said valve having a first position wherein said second induction passage is closed and a second position wherein said second induction passage is open; means for controlling said flow control valve in response to an engine operational parameter; means for controlling said first inlet valve to open before said exhaust valve closes; and means for controlling said second inlet valve to open after said first valve opens.