Title: Dedicated exhaust gas recirculation control systems and methods

Abstract

An engine control system of a vehicle includes a fuel control module that controls fuel injection of a first cylinder of an engine based on a first target air/fuel ratio that is fuel lean relative to a stoichiometric air/fuel ratio and that controls fuel injection of a second cylinder of the engine based on a second target air/fuel ratio that is fuel rich relative to stoichiometry. The first cylinder outputs exhaust to a first three way catalyst (TWC), and the second cylinder outputs exhaust to an exhaust gas recirculation (EGR) valve. An EGR control module controls opening of the EGR valve to: (i) a second TWC that reacts with nitrogen oxides (NOx) in the exhaust and outputs ammonia to a selective catalytic reduction (SCR) catalyst; and (ii) a conduit that recirculates exhaust back to an intake system of the engine.

Inventors:

Sczomak, David P.; Narayanaswamy, Kushal; Keating, Edward J.

Issue Date:

Tue May 01 00:00:00 EDT 2018

Research Org.:

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

Sponsoring Org.:

USDOE

OSTI Identifier:

1438407

Patent Number(s):

9957911

Application Number:

15/046,580

Assignee:

GM Global Technology Operations LLC (Detroit, MI)

Patent Classifications (CPCs):

F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01N - GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02D - CONTROLLING COMBUSTION ENGINES

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F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01N - GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL

F01N13/009 - {having two or more separate purifying devices arranged in series}
F01N13/0093 - {the purifying devices are of the same type}
F01N2560/026 - for measuring or detecting NOx
F01N2900/0416 - using the state of a sensor, e.g. of an exhaust gas sensor
F01N3/101 - {Three-way catalysts}
F01N3/2066 - {Selective catalytic reduction [SCR]}
F01N3/2073 - {with means for generating a reducing substance from the exhaust gases}
F01N9/00 - Electrical control of exhaust gas treating apparatus

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02D - CONTROLLING COMBUSTION ENGINES

F02D35/0015 - {using exhaust gas sensors
F02D41/005 - {according to engine operating conditions}
F02D41/0052 - {Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount}
F02D41/0065 - {Specific aspects of external EGR control
F02D41/008 - {Controlling each cylinder individually}
F02D41/1463 - {of the exhaust gases downstream of exhaust gas treatment apparatus}
F02D41/3011 - {according to or using specific or several modes of combustion}

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02M - SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

F02M26/05 - High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
F02M26/15 - in relation to engine exhaust purifying apparatus
F02M26/35 - with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
F02M26/38 - with two or more EGR valves disposed in parallel
F02M26/43 - in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine
F02M26/71 - Multi-way valves

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02A - TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

Y02A50/20 - Air quality improvement or preservation

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02T - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

Y02T10/12 - Technologies for the improvement of indicated efficiency of a conventional ICE
Y02T10/40 - Engine management systems

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DOE Contract Number:  

EE00006853

Resource Type:

Patent

Resource Relation:

Patent File Date: 2016 Feb 18

Country of Publication:

United States

Language:

English

Subject:

42 ENGINEERING