Electrically Heated Catalysts for Cold-Start Emissions in Diesel Aftertreatment General Motors Company

Format:

Conference/Event

Author/Creator:

Kim, Kim, author.

Contributor:

Gonze, Eugene

Paratore, Michael

Smith, Stuart

Solbrig, Charles

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

With a tighter regulatory environment, reduction of hydrocarbon(HC) and NOx emissions during cold-start has emerged asa major challenge for diesel engines. In the complex dieselaftertreatment system, more than 90% of engine-out NOxis removed in the underfloor SCR. However, the combination of lowtemperature exhaust and heat sink over DOC delays the SCR light-offduring the cold start. In fact, the first 350 seconds during thecold light-duty FTP75 cycle contribute more than 50% of the totalNOx tailpipe emission due to the low SCR temperature.For a fast SCR light-off, electrically heated catalyst (EHC)technology has been suggested to be an effective solution as arapid warm-up strategy.In this work, the EHC, placed in front of DOC, utilizes bothelectrical power and hydrocarbon fuel. The smart energy managementduring the cold-start was crucial to optimize the EHC integratedaftertreatment system. With the EHC warm-up strategy, theunderfloor SCR reached the operation temperature within 100 secondsand achieved more than 90% conversion between 150 and 350 secondsduring the cold FTP75. Furthermore, the integrated system providesan opportunity to improve fuel economy. In summary, the EHC hasbeen demonstrated as an enabling technology for a clean and energyefficient NOx aftertreatment system for dieselengines

Notes:

Vendor supplied data

Publisher Number:

2012-01-1092

Access Restriction:

Restricted for use by site license