Inventors:
David P. Sczomak - Troy MI, US
David B. Brown - Brighton MI, US
Stephen K. Fulcher - Clovis NM, US
Jesse M. Gwidt - Brighton MI, US
Michael J. Lucido - Northville MI, US
Christopher R. Graham - Lake Orion MI, US
Assignee:
GM Global Technology Operations, Inc. - Detroit MI
International Classification:
F01N 3/00
Abstract:
An engine control system that regulates fuel to an engine after lean idle operation includes a first module that determines a rich mass fuel rate based on a lean operation mass air flow and a stoichiometric air to fuel ratio (AFR) and that calculates a time rich based on the rich mass fuel rate. A second module regulates fuel to the engine during a rich operation period after the lean idle operation to provide the rich mass fuel rate for the time rich.