Patent attributes
To improve power performance while avoiding or suppressing surging, an engine control device comprises a VVT mechanism for varying the open/close timing of an intake valve, and the occurrence of surging is determined by comparing an engine rotation variation width with a surge determination threshold. When it is determined that surging has occurred, an ignition timing surge correction amount is set at a value that has been corrected in an advancement direction, and the ignition timing is corrected in the advancement direction by the ignition timing surge correction amount. Further, a VVT surge correction amount by which the open/close timing of the intake valve is corrected using the intake VVT mechanism is set at a value that has been corrected in a retardation direction, and a control current value for operating the intake VVT mechanism is corrected in the retardation direction by the VVT surge correction amount.
