| 摘要 |
PURPOSE:To prevent the drivability from its deterioration or the like due to an output in its change by comparing the final ignition timing, obtained by correcting either of each basic ignition timing for regular or high octane fuel, with the other basic ignition timing and selecting the ignition timing for the regular or high octane fuel. CONSTITUTION:For instance, when a selecting means 3 is placed in a high octane fuel selecting condition, the final ignition timing is determined by adding an ignition timing correction amount to the high octane fuel basic ignition timing, and ignition is performed by an ignition device 8, Now when assumed regular fuel is used, because knocking is easily generated, following its generation, the ignition timing correction amount is gradually decreased, and the final ignition timing is gradually delayed. The final ignition timing after this correction agrees with the regular fuel basic ignition timing in that time, fuel in use is decided to be regular fuel, and the selecting means 3 is switched to a regular side. While here the ignition timing correction amount is initialized to 0. |
