Abstract: A method for controlling an internal combustion engine limits emission of undesirable compounds of nitrogen and oxygen and provides increased transient power.

Abstract: A multiple catalyst system for the treatment of exhaust gases generated by a combustion engine in an after treatment system. The system includes a substrate and a plurality of catalysts. The plurality of catalysts may provide a plurality of catalyst sections. A variety of different catalysts, as well as a variety of different combinations of catalysts, may be employed. Catalysts may include both catalysts that assist in the removal of nitrogen oxides from the exhaust gas during cold start operation of the engine, as well as catalysts that are generally more effective in removing nitrogen oxides after the temperature of the after treatment system and/or exhaust gas is elevated to normal operating temperatures.

Abstract: A system for improving NOx reduction by incorporating an upstream treatment housing having a dual functionality catalyst that includes a diesel oxidation catalyst and a three-way catalyst, and which is positioned upstream of a main exhaust gas treatment system. The upstream treatment housing is positioned in relative close proximity to an exhaust turbine to prevent or minimize a reduction in exhaust gas temperature as the exhaust gas travels between the outlet of the turbine and the upstream treatment housing. By preventing such a reduction in exhaust gas temperature, the three way catalyst in the upstream treatment housing may operate at exhaust gas temperatures higher than those in main exhaust gas treatment system, which may allow for NOx conversion in the upstream treatment housing during certain cold operating or ambient conditions that is not typically attained in the main treatment system during such conditions.