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Dedicated exhaust gas recirculation control systems and methods

United States Patent

May 1, 2018
View the Complete Patent at the US Patent & Trademark Office
U.S. Department of Energy - Visit the Office of the Assistant General Counsel for Technology Transfer & Intellectual Property Website
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.
Sczomak; David P. (Troy, MI), Narayanaswamy; Kushal (Troy, MI), Keating; Edward J. (Ortonville, MI)
GM GLOBAL TECHNOLOGY OPERATIONS LLC (Detroit, MI), U.S. Department of Energy (Washington, DC)
15/ 046,580
February 18, 2016
STATEMENT OF GOVERNMENT RIGHTS This invention was produced pursuant to United States Government Program No. DE-EE00006853 with the U.S. Department of Energy (DoE). The U.S. Government has certain rights in this invention.