Inventors:
Kevin L. Perry - Fraser MI, US
David J. Cleary - Shanghai, CN
Kushal Narayanaswamy - Sterling Heights MI, US
Paul M. Najt - Bloomfield Hills MI, US
Wei Li - Troy MI, US
James Donald Smith - Ann Arbor MI, US
Chang H. Kim - Rochester MI, US
Thompson M. Sloane - Oxford MI, US
Assignee:
GM GLOBAL TECHNOLOGY OPERATIONS, INC. - Detroit MI
International Classification:
F01N 3/20, F02D 41/30
Abstract:
A method for controlling a powertrain includes selectively initiating an ammonia generation cycle, including injecting fuel into a combustion chamber of an engine before a primary combustion event to a calibrated air fuel ratio in a range lean of stoichiometry based upon generation of NOx within the combustion chamber, injecting fuel into the combustion chamber after the primary combustion event based upon an overall air fuel ratio in a range rich of stoichiometry and resulting generation of molecular hydrogen, and utilizing a catalyst device between the engine and a selective catalytic reduction device to produce ammonia.