Engine exhaust system

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United States of America Patent

PATENT NO 9856774
APP PUB NO 20170321590A1
SERIAL NO

15144871

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Abstract

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An engine exhaust system includes an exhaust pipe assembly having an engine exhaust system inlet configured to receive engine exhaust and an engine exhaust system outlet. The system includes a first selective catalytic reduction (SCR) catalyst device positioned downstream in exhaust flow from the engine exhaust system inlet. The first SCR catalyst device includes a substrate with a metallic catalyst coated on the substrate. An electric heater is configured to heat the metallic catalyst. A second SCR catalyst device is positioned downstream in engine exhaust flow from the first SCR catalyst device and upstream of the engine exhaust system outlet. The first SCR catalyst device and the exhaust pipe assembly define an empty chamber between the substrate and the second SCR catalyst device. Engine exhaust flows directly from the substrate to the second SCR catalyst device through the empty chamber.

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Patent Owner(s)

Patent OwnerAddress
GM GLOBAL TECHNOLOGY OPERATIONS LLC300 RENAISSANCE CENTER MAIL CODE 482-C22-A68 P O BOX 300 DETROIT MI 48265

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ardanese, Raffaello Bloomfield Hills, US 34 136
Di, Perna Luciano Nunziato Troy, US 9 61
Li, Jianwen West Bloomfield, US 101 423
Mital, Rahul Rochester Hills, US 59 663
Paratore,, Jr Michael J Howell, US 109 893

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