| 摘要 |
A compression ignition engine ( 10 ) has a control system ( 24 ) for processing data, one or more cylinders ( 16 ), a fueling system ( 18 ), and a variable valve actuation mechanism ( 20 ). Control system ( 24 ) develops both fueling data for fueling the engine and timing data representing time during the engine cycle for intake valve closure to a cylinder that will endow the cylinder with an effective compression ratio (ECR) appropriate to current engine operation for causing auto-ignition to occur near or at top dead center in the engine cycle. During a compression upstroke, the cylinder is fueled according to the fueling data and intake valve closure for the cylinder is performed according to the timing data. This creates an air-fuel mixture that is increasingly compressed to the point of auto-ignition near or at top dead center.
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