A spark-ignition, direct-injection internal combustion engine is coupled to an exhaust aftertreatment system including a three-way catalytic converter upstream of an NH3-SCR catalyst. A method for operating the engine includes operating the engine in a fuel cutoff mode and coincidentally executing a second fuel injection control scheme upon detecting an engine load that permits operation in the fuel cutoff mode.
GOVERNMENT CONTRACT RIGHTS
This invention was made with U.S. Government support under Agreement No. DE-EE0003379 awarded by the U.S. Department of Energy. The U.S. Government may have certain rights in this invention.