Engine control systems and methods for nitrogen oxide reduction

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.

Inventors:: Sczomak, David P.; Gallon, Robert J.; McAlpine, Robert S.; Solomon, Arun S.

Issue Date:: 2018-09-18

OSTI Identifier:: 1483376

Assignee:: GM Global Technology Operations LLC (Detroit, MI) DOEEE

Patent Number(s):: 10,077,727

Application Number:: 14/994,531

Contract Number:: EE00006853

Resource Relation:: Patent File Date: 2016 Jan 13

Research Org:: GM Global Technology Operations LLC, Detroit, MI (United States)

Sponsoring Org:: USDOE

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING

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