Patent · US Active

System and apparatus for enhancing exhaust aftertreatment startup emissions control

US8671666B2 · kind B2 · utility

5Cited by

14References

18Claims

0Family size

Assignee

Cummins Inc. · US

Inventors

Aleksey Yezerets · Columbus, US
Zheng Liu · Knoxville, US
Neal W. Currier · Columbus, US
J. Stephen Wills · Columbus, US

Key dates

Filing date	Mar 10, 2011
Grant date	Mar 18, 2014
Priority date	—
Expiry date	Oct 18, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

An aftertreatment system including a method which provides a selective catalytic reduction (SCR) catalyst disposed in an exhaust stream of an engine; determines that an ammonia pre-load condition for the SCR catalyst is present; determines a first amount of ammonia pre-load in response to the ammonia pre-load condition; injects an amount of ammonia or urea into the exhaust stream in response to the first amount of ammonia; and adsorbs a second amount of ammonia onto the SCR catalyst in response to injecting an amount of ammonia or urea, where the second amount of ammonia is either the injected amount of ammonia or an amount of ammonia resulting from hydrolysis from the injected amount of urea.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.