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Title: Engine control systems and methods for nitrogen oxide reduction

A fuel control module controls fuel injection of an engine based on a predetermined lean air/fuel ratio. The predetermined lean air/fuel ratio is fuel lean relative to a stoichiometric air/fuel ratio for the fuel. A cylinder control module selectively deactivates opening of intake and exhaust valves of M cylinders of the engine to increase removal of nitrogen oxide (NOx) from exhaust. M is an integer greater than 0 and less than a total number of cylinders of the engine. The fuel control module further: disables fueling of the M cylinders while opening of the intake and exhaust valves of the M cylinders is deactivated; and, while fueling of the M cylinders is disabled and opening of the intake and exhaust valves of the M cylinders is deactivated, controls fuel injection of other cylinders based on a predetermined rich air/fuel ratio that is fuel rich relative to the stoichiometric air/fuel ratio.
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Issue Date:
OSTI Identifier:
GM Global Technology Operations LLC (Detroit, MI) DOEEE
Patent Number(s):
Application Number:
Contract Number:
Resource Relation:
Patent File Date: 2016 Jan 13
Research Org:
GM Global Technology Operations LLC, Detroit, MI (United States)
Sponsoring Org:
Country of Publication:
United States

Works referenced in this record:

Three-Way Catalyst Design for Urealess Passive Ammonia SCR: Lean-Burn SIDI Aftertreatment System
conference, April 2011
  • Kim, Chang Hwan; Perry, Kevin; Viola, Michael
  • SAE 2011 World Congress & Exhibition
  • DOI: 10.4271/2011-01-0306