Patent · US Active

Aftertreatment system and method

US11143078B2 · kind B2 · utility

0Cited by

5References

19Claims

0Family size

Assignee

Caterpillar Inc. · US

Inventors

Paul Moore · Dunlap, US
Ling Deng · Dunlap, US
Wilce Damion Williams · Peoria, US

Key dates

Filing date	Dec 17, 2019
Grant date	Oct 12, 2021
Priority date	—
Expiry date	Dec 17, 2039

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/30
WIPO fieldEnvironmental technology
WIPO sectorChemistry

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.

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