| 摘要 |
PROBLEM TO BE SOLVED: To avoid knocking due to delay of operation of a variable compression ratio mechanism when accelerating without depending on ignition timing retard accompanied by reduction of torque. SOLUTION: Variable control of an effective compression ratio becomes possible by the variable compression ratio mechanism for changing a mechanical compression ratio (nominal compression ratio) of the internal combustion engine and a variable valve train for changing intake valve closing timing. Although a set effective compression ratio which becomes a target is reduced when accelerating, an actual effective compression ratio is changed in delay due to delay of operation of the variable compression ratio mechanism and the variable valve train. When the actual effective compression ratio departs from the set effective compression ratio to a high compression ratio side, the amount of fuel increase is corrected to avoid knocking. The amount of fuel increase correction is given in accordance with the amount of departure. COPYRIGHT: (C)2006,JPO&NCIPI
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