IGNITION TIMING CONTROL DEVICE AND IGNITION TIMING CONTROL METHOD OF INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To provide an ignition timing control device and an ignition timing control method of an internal combustion engine, capable of restraining the occurrence of knocking and reduction in output in a transition period for changing a valve characteristic. SOLUTION: An electronic control device 30 is applied to an engine 1 having a variable valve train capable of varying the valve characteristic of an intake valve 9, and is provided for changing the ignition timing in response to a change in the valve characteristic of the intake valve 9. By driving of the variable valve train, the knocking occurrence timing of most easily causing the knocking is calculated based on an operation state of the internal combustion engine among the transition period when the valve closing timing of the intake valve 9 transfers between time before the intake bottom dead center and time after the intake bottom dead center, and calculates the ignition timing by using the basic ignition timing corresponding to time before changing the valve characteristic in a period when the actual valve closing timing becomes before the knocking occurrence timing among the transition period, and calculates the ignition timing by using the basic ignition timing corresponding to time after changing the valve characteristic in a period when the actual valve closing timing exceeds the knocking occurrence timing. COPYRIGHT: (C)2010,JPO&INPIT