IGNITION-TIMING CONTROLLER FOR INTERNAL-COMBUSTION ENGINE

摘要

PURPOSE:To prevent each deterioration of fuel consumption and drivability by installing a fuel composition ratio calculating means for calculating the composition-ratio of mixed fuel and an ignition-timing calculating means for mixed fuel for calculating the ignition-timing for mixed fuel. CONSTITUTION:A fuel composition ratio calculating means calculates the composition ratio (r) of the mixed fuel on the basis of the detected pressure PF and the temperature THF of the mixed fuel. An ignition-timing calculating means for mixed fuel calculates the ignition-timing for mixed fuel according to the calculated composition ratio (r) of mixed fuel and the calculated ignition-timing thetaBSE1 for high octane number fuel, and the ignition-timing thetaBSE2 for low octane number fuel. Since the ignition-timing suitable for the composition ratio of mixed fuel is calculated from the ignition-timing for two kinds of fuel, each deterioration of fuel consumption and drivability can be suppressed.