公开(公告)号：US09890679B2

公开(公告)日：2018-02-13

申请号：US14910055

申请日：2014-06-19

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Yuki Bisaiji ,  Kohei Yoshida

IPC: F01N3/10 ,  F01N3/20 ,  B01D53/94 ,  F01N3/08 ,  F02D41/02 ,  F01N9/00 ,  F01N3/035 ,  F02D41/40

CPC classification number: F01N3/208 ,  B01D53/9409 ,  B01D53/9422 ,  B01D53/9477 ,  B01D53/9495 ,  B01D2251/208 ,  B01D2255/1021 ,  B01D2255/20738 ,  B01D2255/50 ,  B01D2255/91 ,  B01D2258/012 ,  F01N3/035 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/0871 ,  F01N3/2066 ,  F01N9/007 ,  F01N2240/30 ,  F01N2370/02 ,  F01N2430/06 ,  F01N2510/06 ,  F01N2610/02 ,  F01N2610/03 ,  F01N2900/0412 ,  F01N2900/0416 ,  F01N2900/0422 ,  F01N2900/1402 ,  F01N2900/1602 ,  F01N2900/1614 ,  F01N2900/1622 ,  F02D41/0235 ,  F02D41/0275 ,  F02D41/402 ,  F02D2200/08 ,  Y02T10/24

Abstract: An internal combustion engine in which a hydrocarbon feed valve, exhaust purification catalyst, and NOX selective reduction catalyst are arranged in an engine exhaust passage. A first NOX removal method which injects hydrocarbons from the hydrocarbon feed valve within a predetermined range of period and uses the reducing intermediate which is generated due to this so as to reduce the NOX contained in the exhaust gas and a second NOX removal method which makes the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst rich with a period longer than this predetermined range are used. When the first NOX removal method should be used and the amount of adsorbed ammonia at the NOX selective reduction catalyst is large, use of the first NOX removal method is stopped.

公开(公告)号：US09617936B2

公开(公告)日：2017-04-11

申请号：US14910847

申请日：2014-06-27

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Yuki Haba ,  Kohei Yoshida ,  Yusuke Nozaki

IPC: F01N3/00 ,  F02D41/02 ,  F01N3/08 ,  F01N3/20 ,  F02D41/14

CPC classification number: F02D41/0275 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/0871 ,  F01N3/2066 ,  F01N3/208 ,  F01N2370/02 ,  F01N2430/06 ,  F01N2610/03 ,  F01N2900/0412 ,  F01N2900/0422 ,  F01N2900/1602 ,  F01N2900/1614 ,  F01N2900/1622 ,  F02D41/1454 ,  F02D41/1475 ,  F02D2200/0806 ,  F02D2200/0808 ,  Y02T10/24

Abstract: In an internal combustion engine, a hydrocarbon feed valve and an exhaust purification catalyst are arranged in an engine exhaust passage. A first NOX removal method which injects hydrocarbons from the hydrocarbon feed valve within a predetermined range of period so that the reducing intermediate generated thereby reduces the NOX contained in the exhaust gas and a second NOX removal method which makes the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst a first target rich air-fuel ratio by a period which is longer than this predetermined range are used. When the NOX removal method is switched from the second NOX removal method to the first NOX removal method, the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst is made a second target air-fuel ratio which is smaller than the first target rich air-fuel ratio.