| 摘要 |
PROBLEM TO BE SOLVED: To provide an operation controller for an engine capable of increasing torque by suppressing occurrence of knocking and performing stable combustion by suppressing EGR gas amount to increase thermal efficiency. SOLUTION: In this operation controller for the engine provided with a valve gear capable of changing and controlling at least intake valve opening time (IVO), intake valve closing time (IVC), and exhaust valve closing time (EVC) to operate the engine 1 by SI mode for starting combustion by spark ignition in accordance with operation regions a to i or HCCI mode for starting combustion by premixed compression self-ignition, valve overlap (OL) is controlled in such a way that it is large and its center is positioned in the vicinity of top dead center (TDC) in high load SI mode, and the intake valve closing time IVC is controlled to a position apart in the rear or front of bottom dead center (BDC). COPYRIGHT: (C)2006,JPO&NCIPI
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