公开(公告)号：US20110192148A1

公开(公告)日：2011-08-11

申请号：US13013498

申请日：2011-01-25

Applicant: Yuji YASUI

Inventor： Yuji YASUI

IPC: F01N3/18

CPC classification number: F01N3/208 ,  F01N3/103 ,  F01N11/00 ,  F01N2610/02 ,  F01N2900/0422 ,  F01N2900/1402 ,  F01N2900/1616 ,  F01N2900/1622 ,  Y02T10/24 ,  Y02T10/47

Abstract: An exhaust gas purifying apparatus for an internal combustion engine is provided. A selective reduction catalyst is disposed in an exhaust passage of the engine for reducing NOx in exhaust gases from the engine under existence of a reducing agent. The reducing agent or a reactant for generating the reducing agent is supplied to the upstream side of the selective reduction catalyst. Occurrence of a reducing-agent slip in which the reducing agent is discharged to the downstream side of the selective reduction catalyst is determined. A storage amount indicative of an amount of the reducing agent stored in the selective reduction catalyst is temporarily reduced from the state where the storage amount is at the maximum, and thereafter the storage amount is increased until the occurrence of the reducing-agent slip is detected. An accuracy of the reducing agent supply is determined according to an occurrence state of the reducing agent slip when the storage amount is changed.

Abstract translation: 提供一种用于内燃机的废气净化装置。 在发动机的排气通道中设置选择还原催化剂，用于在还原剂存在下还原来自发动机的废气中的NOx。 将还原剂或用于产生还原剂的反应物供给到选择还原催化剂的上游侧。 确定将还原剂排出到选择还原催化剂的下游侧的还原剂滑移的发生。 从储存量最大的状态暂时减少表示存储在选择还原催化剂中的还原剂的量的保存量，此后，存储量增加，直到检测到还原剂滑动的发生 。 当存储量改变时，根据还原剂滑移的发生状态来确定还原剂供应的精度。