| 摘要 |
PURPOSE:To provide an ignition timing controlling apparatus for an internal combustion engine, which is capable of preventing rough idling operation of the engine, by controlling the ignition timing on the basis of the difference between the mean value of the idling speed and the actual engine speed when the engine is being warmed up. CONSTITUTION:At a step 25, it is detected, for instance, from the temperature of engine cooling water whether an engine is being warmed up or not. If it is detected that warming-up of the engine is not completed, the mean engine speed Na is calculated at a step 29 and it is considered as an aimed engine speed NF during the while when the engine is being warmed up (step 30). Further, at a step 27, an ignition timing correcting value thetaIDL is calculated from the difference between the aimed engine speed NF and the actual engine speed NP. Thus, it is enabled to prevent occurrence of hunting of the engine speed during while when the engine is being warmed up. |
