公开(公告)号：US20170074137A1

公开(公告)日：2017-03-16

申请号：US15266402

申请日：2016-09-15

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Salvatore SANNINO ,  Gennaro MERLINO ,  Giancarlo CIFALI

IPC: F01N3/08 ,  F01N9/00 ,  F01N11/00

CPC classification number: F01N3/0885 ,  B01D53/9477 ,  B01D53/9495 ,  B01D2251/2062 ,  B01D2258/012 ,  F01N3/0814 ,  F01N3/0842 ,  F01N9/002 ,  F01N11/007 ,  F01N2550/03 ,  F01N2560/021 ,  F01N2560/025 ,  F01N2560/026 ,  F01N2900/1402 ,  F01N2900/1404

Abstract: A method of operating an aftertreatment system of an internal combustion engine having a lean nitrogen-oxides trap and a reductant storage device placed downstream of the lean nitrogen-oxides trap is disclosed. A regeneration of the lean nitrogen-oxides trap is performed. During the regeneration, a reductant concentration between the lean nitrogen-oxides trap and the reductant storage device is measured. An amount of reductant produced by the nitrogen-oxides trap is calculated on the basis of the measured concentration. The amount of reductant produced may be used to stop regeneration of the LNT if this amount reaches the maximum available storage capacity, or to trigger a test of the proper functioning of the reductant storage device if there is at least a minimum amount of reductant available, or to switch to another operation mode of the reductant storage device and/or the LNT, in particular if this amount is larger than a threshold value.

Abstract translation: 公开了一种操作具有贫氮氧化物阱的内燃机和置于贫氮氧化物阱的下游的还原剂储存装置的后处理系统的方法。 进行贫氮氧化物阱的再生。 在再生期间，测量贫氮氧化物阱和还原剂储存装置之间的还原剂浓度。 基于测量的浓度计算由氮氧化物阱产生的还原剂的量。 如果该量达到最大可用存储容量，则所产生的还原剂的量可用于停止LNT的再生，或者如果存在至少最少量的还原剂可用，则触发对还原剂存储装置的正常功能的测试， 或者切换到还原剂存储装置和/或LNT的另一操作模式，特别是如果该量大于阈值。