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Engine control systems and methods for nitrogen oxide reduction

Patent ·
OSTI ID:1483376
; ; ;

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.

Research Organization:
GM Global Technology Operations LLC, Detroit, MI (United States)
Sponsoring Organization:
USDOE
Assignee:
GM Global Technology Operations LLC (Detroit, MI)
Patent Number(s):
10,077,727
Application Number:
14/994,531
OSTI ID:
1483376
Country of Publication:
United States
Language:
English

References (5)

“Catalytic Engine” NOx Reduction of Diesel Engines with New Concept Onboard Ammonia Synthesis System conference February 1992
A NOx reduction system using ammonia-storage selective catalytic reduction in rich/lean excursions journal November 2007
Combustion Characteristics of a Spray-Guided Direct-Injection Stratified-Charge Engine with a High-Squish Piston conference April 2005
In-Situ NH3 Generation for SCR NOx Applications conference October 2002
Three-Way Catalyst Design for Urealess Passive Ammonia SCR: Lean-Burn SIDI Aftertreatment System conference April 2011

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