ENGINE PERFORMING EXHAUST GAS RECIRCULATION

摘要

PROBLEM TO BE SOLVED: To separately control engine load and the quantity of EGR in performing internal EGR using an intake control valve. SOLUTION: This engine is provided with the intake control valve 15 provided at an intermediate part of an intake passage 7 and upstream of an intake valve 10. An engine controller 30 holds negative pressure in the intake passage between the intake control valve 15 and the intake valve 10 by closing the intake control valve 15 in a period when the pressure in the intake passage between the intake control valve 15 and the intake valve 10 becomes negative, during the closed period of the intake valve 10 after an intake stroke. This negative pressure makes burnt gas in a combustion chamber 5 flow back to the intake passage 7 in an overlap period when both the intake valve 10 and an exhaust valve 1 are open near the top dead center of exhaust. COPYRIGHT: (C)2005,JPO&NCIPI