| 摘要 |
PROBLEM TO BE SOLVED: To cause self-ignition in a 4-stroke engine. SOLUTION: In a predetermined load range from low load to medium load in an engine, an exhaust valve is closed before an intake top dead center TDC, and as demand load L is reduced, valve closing timing EC for the exhaust valve is advanced. An intake valve is opened after the intake top dead center TDC, and as the demand load L is reduced, valve opening timing IO of the intake valve is delayed. The intake valve is closed after an intake bottom dead center BDC, and as the demand load L is increased, valve closing timing IC for the intake valve is gradually delayed, and then it is gradually advanced. COPYRIGHT: (C)2006,JPO&NCIPI
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