公开(公告)号：US20210180494A1

公开(公告)日：2021-06-17

申请号：US16717409

申请日：2019-12-17

Applicant: Caterpillar Inc.

Inventor： Paul R. Moore ,  Ling Deng ,  Wilce Damion Williams

IPC: F01N3/20 ,  F01N13/00

Abstract: A system for the treatment of exhaust gases from an internal combustion engine with a combustion chamber includes an upstream DEF injector disposed to introduce DEF to the combustion chamber and a close-coupled SCR catalyst downstream of and in close-coupled relation to the internal combustion engine. Downstream of the close-coupled SCR catalyst may be a primary SCR catalyst and a primary DEF injector. The system may operate to reduce NO2 in the close-coupled SCR catalyst during low-load conditions of the internal combustion engine and reduce NO2 in the primary SCR catalyst during loaded conditions.

公开(公告)号：US11143078B2

公开(公告)日：2021-10-12

申请号：US16717409

申请日：2019-12-17

Applicant: Caterpillar Inc.

Inventor： Paul R. Moore ,  Ling Deng ,  Wilce Damion Williams

IPC: F01N3/20 ,  F01N13/00 ,  F01N3/035 ,  F01N3/10

Abstract: A system for the treatment of exhaust gases from an internal combustion engine with a combustion chamber includes an upstream DEF injector disposed to introduce DEF to the combustion chamber and a close-coupled SCR catalyst downstream of and in close-coupled relation to the internal combustion engine. Downstream of the close-coupled SCR catalyst may be a primary SCR catalyst and a primary DEF injector. The system may operate to reduce NO2 in the close-coupled SCR catalyst during low-load conditions of the internal combustion engine and reduce NO2 in the primary SCR catalyst during loaded conditions.

公开(公告)号：US20210189982A1

公开(公告)日：2021-06-24

申请号：US16721087

申请日：2019-12-19

Applicant: Caterpillar Inc.

Inventor： Kevin J. Weiss ,  Paul R. Moore

IPC: F02D41/02 ,  B60W30/00 ,  B60W10/06 ,  B60W10/101 ,  F16H47/08 ,  B60W10/30 ,  F01N3/20

Abstract: A powertrain for a machine includes an internal combustion engine, an aftertreatment system including a selective catalytic reduction (SCR) catalyst for treating exhaust gases from the internal combustion engine, and a continuously variable transmission operatively coupled to the internal combustion engine. An electronic controller can measure a catalyst temperature of the SCR catalyst and can inversely adjust an engine speed and a CVT output to selectively regulate a catalyst temperature of the SCR catalyst. In an embodiment, the CVT may be a hydro-mechanical transmission including a hydrostatic transmission and a mechanical transmission.