公开(公告)号：US20150113985A1

公开(公告)日：2015-04-30

申请号：US14568585

申请日：2014-12-12

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Bungo KAWAGUCHI ,  Tomihisa ODA ,  Tomomi ONISHI ,  Masaaki SATO ,  Satoshi KOBAYAKAWA ,  Takeru SHIRASAWA

IPC: F01N3/20 ,  F02M25/07

CPC classification number: F01N3/208 ,  F01N3/20 ,  F01N3/2013 ,  F01N13/009 ,  F01N2240/36 ,  F01N2240/40 ,  F01N2610/02 ,  F01N2610/1453 ,  F02B29/0406 ,  F02B37/22 ,  F02D41/005 ,  F02D41/0065 ,  F02D41/126 ,  F02M26/05 ,  F02M26/06 ,  F02M26/08 ,  F02M26/10 ,  F02M26/15 ,  F02M26/23 ,  F02M26/36 ,  Y02T10/24 ,  Y02T10/26 ,  Y02T10/47

Abstract: The present invention discloses an exhaust gas purification system for an internal combustion engine, which is provided with: a low pressure EGR mechanism that is equipped with a low pressure EGR passage and a low pressure EGR valve; a selective reduction type catalyst that is arranged in a portion of the exhaust passage downstream; a supply device which serves to supply an ammonia derived compound to said selective reduction type catalyst; and a control unit that causes said supply device to supply the ammonia derived compound when said low pressure EGR valve is in a valve open state, makes the amount of the ammonia derived compound supplied from said supply device larger in cases where an amount of the low pressure EGR gas flowing through said low pressure EGR passage is large, in comparison with the case where it is small.

Abstract translation: 本发明公开了一种内燃机的排气净化系统，其具备：配置有低压EGR通路和低压EGR阀的低压EGR机构， 选择性还原型催化剂，其布置在下游的排气通道的一部分中; 用于向所述选择还原型催化剂供应氨衍生化合物的供应装置; 以及控制单元，当所述低压EGR阀处于阀打开状态时，使所述供给装置供给氨衍生化合物，使得从所述供给装置供给的氨衍生物的量较大， 与其小的情况相比，流经所述低压EGR通路的高压EGR气体大。

公开(公告)号：US20150300229A1

公开(公告)日：2015-10-22

申请号：US14648814

申请日：2013-12-02

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Satoshi KOBAYAKAWA

IPC: F01N3/20

CPC classification number: F01N3/208 ,  B01D53/9477 ,  B01D53/9495 ,  B01D2251/2062 ,  B01D2251/2067 ,  B01D2255/1021 ,  B01D2255/1023 ,  B01D2255/2092 ,  B01D2255/50 ,  B01D2257/404 ,  B01D2258/012 ,  F01N3/106 ,  F01N2610/03 ,  F01N2900/1404 ,  F01N2900/1602 ,  F01N2900/1621 ,  F01N2900/1812 ,  F02D41/0002 ,  F02D41/0235 ,  F02D41/025 ,  F02D41/0255 ,  F02D41/1475 ,  F02D41/405 ,  F02D2200/0802 ,  F02D2200/602 ,  Y02T10/24 ,  Y02T10/26 ,  Y02T10/42

Abstract: An object of the present invention is to increase the NOx purification rate of an unactivated SCR catalyst in an exhaust emission control system for an internal combustion engine that has an oxidation catalyst and the SCR catalyst disposed downstream of the oxidation catalyst. In order to achieve this object, the present invention provides an exhaust emission control system for an internal combustion engine, including an oxidation catalyst disposed in an exhaust passage of the internal combustion engine, an SCR catalyst that is disposed downstream of the oxidation catalyst in the exhaust passage, and a supply device for supplying unburnt fuel to the oxidation catalyst when the SCR catalyst is not yet activated, wherein the amount of NO2 that flows into the SCR catalyst is increased by reducing the amount of unburnt fuel supplied, when a low-load operation of the internal combustion engine is performed.

Abstract translation: 本发明的目的是提高具有氧化催化剂的内燃机的排气排放控制系统和设置在氧化催化剂下游的SCR催化剂的未活化SCR催化剂的NOx净化率。 为了达到上述目的，本发明提供一种内燃机的废气排放控制系统，其包括设置在内燃机的排气通路中的氧化催化剂，SCR催化剂，其设置在氧化催化剂的下游 排气通道和用于在SCR催化剂尚未活化时向氧化催化剂供应未燃烧燃料的供给装置，其中当低催化剂催化剂未活化时，通过减少未燃烧的燃料的量来增加流入SCR催化剂中的NO 2的量， 执行内燃机的负载运转。