ENGINE COMBUSTION CONTROL SYSTEM

Abstract: an engine combustion control system includes an ignition coil, an igniter which induces high voltage in the ignition coil to cause electric discharge between plug electrodes of an engine spark plug, a bias voltage generator which applies bias voltage to the plug electrodes, an ion current detector, an ignition controller which controls the bias voltage to be applied simultaneously to a start of a low-temperature oxidation reaction, and the electric discharge occurs at an ignition timing later than the reaction start, and an estimator which estimates a fuel property based on an ion current detected during a period from the bias voltage application start to a given timing earlier than the ignition timing. the ignition controller corrects the ignition timing according to the fuel property in the same cycle as that of the fuel property estimation, and controls so that the electric discharge occurs at the corrected ignition timing.

Inventor(s): Tatsuya Tanaka, Yoshihisa Nakamoto, Kiyotaka Sato

CPC Classification: F02P9/007 ({by supplementary electrical discharge in the pre-ionised electrode interspace of the sparking plug, e.g. plasma jet ignition})

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