Patent ID: 9528413
Filing Date: 2016-12-27
CPC Classification: F01N,Y02A,Y02T

Claim Text:
1. An engine system comprising: a first DOC receiving engine exhaust; a zeolite SCR device coupled downstream of the first DOC in an exhaust flow direction; a second DOC coupled downstream of the SCR device, having a lower platinum-group metal loading than the first DOC and a light-off temperature aligned with a desorption temperature of the SCR device, the light-off temperature of the second DOC lower than a light-off temperature of the first DOC; an SCR-type soot filter downstream of the SCR device and upstream of the second DOC; a urea injector coupled between the SCR device and the first DOC; and a control system including a non-transient, computer-readable medium including instructions for: