Patent ID: 9677439
Date: 2017-06-13
CPC Classifications: F01N,Y02T

Claim:
1. A system, comprising: an internal combustion engine; an exhaust conduit fluidly coupled to the internal combustion engine; at least one close-coupled device fluidly coupled to the exhaust conduit that is configured to provide a storage location for hydrocarbons and oxides of nitrogen in an exhaust gas produced by the internal combustion engine during at least one of an engine cold start operating condition and a catalyst warm up operating condition, the at least one close-coupled device further including an oxidation catalyst downstream of the storage location of the hydrocarbons and oxides of nitrogen and a combination particulate filter/selective catalytic reduction (SCR) portion fluidly coupled to the exhaust conduit downstream of the oxidation catalyst; a second SCR element fluidly coupled to the exhaust conduit downstream of the combination particulate filter/SCR portion; a first reductant injector upstream of the combination particulate filter/SCR portion configured to selectively provide a reductant to the exhaust flow path in response to a first reductant injector command; and a second reductant injector downstream of the combination particulate filter/SCR portion and upstream of the second SCR element configured to selectively provide the reductant to the exhaust flow path in response to a second reductant injector command.