Method for operating engine for vehicle e.g. road automobile, involves directly injecting purging substance e.g. ethanol, via second of two injectors based on idle period at engine output lower than previous output

摘要

At an engine output lower than a previous engine output, one of two fuel injectors, preferably a port injector, delivers fuel, such as gasoline into the cylinder, and a purging substance, such as ethanol and water, is injected directly through the other injector based on an idle period. The idle period is weighted based on the operating condition, such as engine load or engine rotational speed.