Patent ID: 9243534
Filing Date: 2016-01-26
CPC Classification: F01N,Y02T

Claim Text:
1. An aftertreatment system for an engine, the aftertreatment system comprising: a selective catalytic reduction (SCR) catalyst in fluid communication with an exhaust stream generated from the engine; an oxidation catalyst (OC), upstream of the SCR catalyst and in fluid communication with the exhaust stream; a gaseous reductant injector, upstream of the SCR catalyst and downstream of the OC, and in fluid communication with the exhaust stream; a first gas sensor upstream of the OC; a second gas sensor downstream of the SCR catalyst; a controller, operatively connected to the first gas sensor, the second gas sensor and the gaseous reductant injector, wherein the controller receives signals representative of combined gas concentrations detected in the exhaust stream by the first gas sensor and the second gas sensor, estimates individual species concentrations of nitric oxide (NO) and nitrogen dioxide (NO