公开(公告)号：US08794057B2

公开(公告)日：2014-08-05

申请号：US13688342

申请日：2012-11-29

Applicant: GM Global Technology Operations LLC

Inventor： Raffaello Ardanese ,  Vincent J. Tylutki ,  James M Perrin ,  Justin A Shetney

IPC: G01M15/10 ,  F01N11/00

CPC classification number: F01N11/007 ,  F01N3/103 ,  F01N3/208 ,  F01N9/002 ,  F01N11/00 ,  F01N11/002 ,  F01N2550/02 ,  F01N2560/026 ,  F01N2560/14 ,  F01N2900/0422 ,  F01N2900/0601 ,  F01N2900/1404 ,  F01N2900/1411 ,  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 the 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 by a controller. A DOC aging level based on a predetermined correlation between the difference and DOC aging can then be determined by the controller if at least one predetermined operating condition is satisfied.

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。 第一传感器信号和第二传感器信号之间的差异由控制器计算。 然后，如果满足至少一个预定操作条件，则可以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。