公开(公告)号：US09084966B2

公开(公告)日：2015-07-21

申请号：US13688331

申请日：2012-11-29

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Raffaello Ardanese ,  Vincent J Tylutki ,  Christopher P Musienko ,  Shouxian Ren ,  Chang H Kim

IPC: G01M15/10 ,  B01D53/94 ,  F01N3/10 ,  F01N3/20 ,  F01N11/00

CPC classification number: B01D53/9413 ,  B01D53/9418 ,  B01D53/9445 ,  B01D53/9477 ,  B01D53/9495 ,  B01D2258/012 ,  F01N3/103 ,  F01N3/2066 ,  F01N11/00 ,  F01N2550/02 ,  F01N2560/026 ,  F01N2560/06 ,  Y02T10/22 ,  Y02T10/24 ,  Y02T10/47

Abstract: A method of determining aging of a diesel oxidation catalyst (DOC) in an engine exhaust system includes receiving a first sensor signal from a first nitrogen oxides (NOx) sensor positioned in exhaust flow upstream of the DOC. The first sensor signal is indicative of an amount of NOx in the exhaust flow upstream of the DOC. The method further includes receiving a second sensor signal from a second NOx sensor positioned in exhaust flow downstream of the DOC. The second sensor signal is indicative of an amount of NOx downstream of the DOC. A difference between the first sensor signal and the second sensor signal is calculated via a controller. A DOC aging level based on a predetermined correlation between the difference and DOC aging is then determined by the controller.

Abstract translation: 确定发动机排气系统中的柴油氧化催化剂（DOC）的老化的方法包括从位于DOC上游的排气流中的第一氮氧化物（NOx）传感器接收第一传感器信号。 第一传感器信号表示DOC上游排气流中的NOx的量。 该方法还包括从位于DOC下游的排气流中的第二NOx传感器接收第二传感器信号。 第二传感器信号指示DOC下游的NOx的量。 通过控制器计算第一传感器信号和第二传感器信号之间的差异。 然后由控制器确定基于差异和DOC老化之间的预定相关性的DOC老化水平。