Steuerung für verbesserte Katalysatoraufwärmung

摘要

The method involves setting the ignition timing signal to an initial value as a function of engine operating parameters, and advancing the ignition timing signal beyond the initial value when an indication of engine intake manifold vacuum is below a threshold value. The ignition timing signal is retarded when the manifold vacuum indication is greater than the threshold value. The initial value is retarded when the manifold vacuum indication is less than the threshold value and the ignition timing was advanced from the initial value to a value greater than a predetermined value.