公开(公告)号：US11802502B1

公开(公告)日：2023-10-31

申请号：US18103084

申请日：2023-01-30

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Patrick G. Szymkowicz ,  Mingjie Tu ,  Yuntao Gu ,  Calvin Thomas

IPC: F01N3/20 ,  F01N3/08

CPC classification number: F01N3/206 ,  F01N3/0835 ,  F01N3/2013 ,  F01N2570/12 ,  F01N2570/22 ,  F01N2900/1404 ,  F01N2900/1628

Abstract: An exhaust system includes a light-off catalyst, an exhaust system component, and at least one H2O trap. The exhaust system component is upstream from the light-off catalyst and includes catalyst material, the catalyst material configured to store hydrocarbons during a period when the light-off catalyst is warming up to a light-off temperature. The at least one H2O trap is at or upstream from the exhaust system component and is configured to perform H2O adsorption and desorption to increase a length of time for the exhaust system component to reach a hydrocarbon release temperature and prevent the exhaust system component from reaching the hydrocarbon release temperature prior to the light-off catalyst reaching the light-off temperature.

公开(公告)号：US20250075650A1

公开(公告)日：2025-03-06

申请号：US18461807

申请日：2023-09-06

Applicant: GM Global Technology Operations LLC

Inventor： Yuntao Gu ,  Patrick G. Szymkowicz ,  Wei Li ,  Calvin Thomas ,  Mingjie Tu

IPC: F01N3/30 ,  B01D53/34 ,  B01D53/94 ,  F01N3/10 ,  F01N3/20 ,  F01N11/00 ,  F01N13/00

Abstract: An exhaust gas treatment system including: an internal combustion engine comprising an exhaust gas outlet; a first three way catalyst downstream of the exhaust gas outlet, wherein the first three way catalyst receives an exhaust output from the exhaust gas outlet; a hydrocarbon trap downstream of the first three way catalyst, wherein the hydrocarbon trap receives an exhaust output from the first three way catalyst; an exhaust heating unit downstream of the hydrocarbon trap, wherein the exhaust heating unit receives an exhaust output from the hydrocarbon trap; and a second three way catalyst downstream of the exhaust heating unit, wherein the second three way catalyst receives an exhaust output from the heating unit, wherein an air injection port is configured to selectively deliver a stream of air upstream of the hydrocarbon trap and downstream of the first three way catalyst.