| 摘要 |
PROBLEM TO BE SOLVED: To perform optimum ignition timing control while improving intake efficiency in a variable intake device for an internal combustion engine. SOLUTION: An intake control valve 33 is provided communicating a surge tank 31 and a sub-tank 32 with an intake pipe 22, and an EGR passage 34 and an EGR valve 35 are provided for recirculating exhaust gas to the surge tank 31. When an engine 11 is shifted from a high load state to a low load state and the intake control valve 33 is changed over into the open state from the closed state, the opening of the EGR valve 35 is held to the opening before the changeover, that is, to the closed state during a prescribed operation delay time, and the EGR valve 35 is opened after the lapse of the operation delay time. COPYRIGHT: (C)2004,JPO&NCIPI
|
