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A method and an apparatus in which an engine is controlled by a microcomputer on the basis of a basic ignition advanced angle, an ignition advanced angle unit-correction value and a supplied air quantity unit-correction value stored in maps for providing a best fuel consumption corresponding to each

A method and an apparatus in which an engine is controlled by a microcomputer on the basis of a basic ignition advanced angle, an ignition advanced angle unit-correction value and a supplied air quantity unit-correction value stored in maps for providing a best fuel consumption corresponding to each of various running conditions such as an intake air quantity, engine revolution number, and the like, as well as on the basis of correction factors corresponding to running conditions such as stable running and unstable running. In order to obtain a best fuel consumption in a stable running state, the ignition advanced angle and the supplied air quantity are parallelly corrected by the ignition advanced angle unit-correction value and the supplied air quantity unit-correction value respectively while discriminating increment of torque so that this correction is successively repeated until a best fuel consumption is reached. The ignition advanced angle correction factors and the air quantity correction factors are stored, updating the previously stored data, on the basis of the respective total correction values searched by the successively repeated corrections.

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A method of controlling an internal-combustion engine for a vehicle comprising means for controlling supplied fuel, means for correcting supplied-air quantity, means for variably controlling ignition timing, stability discrimination means for discriminating a stable running state of said engine, sai

A method of controlling an internal-combustion engine for a vehicle comprising means for controlling supplied fuel, means for correcting supplied-air quantity, means for variably controlling ignition timing, stability discrimination means for discriminating a stable running state of said engine, said method comprising the steps of: previously determining an ignition timing unit-correction angle value and an air quantity unit-correction value corresponding to various running conditions of said engine; cyclically correcting the ignition timing and the supplied-air quantity each by the respective unit-correction value in response to current running conditions of said engine and an output signal indicating a stable running state produced from said stability discrimination means; checking for an engine-output change per every correction of the ignition timing and the supplied-air quantity to determine the respective direction of the next cycle correction; ending the cyclical correction with the check of the engine-output change in a predetermined range; and starting the cyclical correction for new running conditions of said engine after a predetermined interval after said ending step.