TEMPERATURE-CONTROLLED EXHAUST GAS RECIRCULATION SYSTEM AND METHOD FOR DUAL FUEL ENGINE

摘要

Systems and methods for operating an engine (102) include controlling a temperature of recirculated exhaust gas to achieve a predetermined recirculated exhaust gas temperature. A mixture of air and temperature-controlled recirculated exhaust gas are admitted in a combustion chamber (110) and a gaseous fuel injector (158) delivers gaseous fuel during an intake stroke (210). A diesel fuel injector (156) is activated for a first time to deliver a pre-pilot diesel quantity directly into the combustion chamber (110) at an early stage of a compression stroke (214), and is activated again for a second time to deliver a pilot diesel quantity directly into the combustion chamber (110) at a later stage of the compression stroke (214). A total air/fuel ratio within the combustion chamber (110) upon completion of the second diesel fuel injector activation is lean. The air/fuel mixture is combusted during a combustion stroke, and combustion products are removed during an exhaust stroke.