Cummins Inc.

Steve Charlton

John M Mulloy

Thomas Dollmeyer

Larry J Brackney

George A Brunemann

A combustion manager portion of an engine controller is responsive to ambient air density and engine temperature signals to schedule charge flow and EGR fraction commands. The combustion manager includes a data structure determination block operable to select an appropriate engine speed/engine fueling data structure based on air density and engine temperature information as well as on desired emissions level and engine operating state (i.e., steady state or transient) information. Charge flow and EGR fraction determination blocks are, in turn, responsive to current engine speed and engine fueling information to produce compute the EGR fraction and charge flow commands as a function of the selected engine speed/engine fueling data structures.

System for producing charge flow and EGR fraction commands based on engine operating conditions

A variable geometry turbine and active wastegate are provided in combination along with independent control of the variable geometry turbine and wastegate valve so as to independently control exhaust gas recirculation flow and air flow in an internal combustion engine. Such independent control of exhaust gas recirculation flow and air flow in an internal combustion engine is achieved by providing a system for exhaust gas recirculation including an intake air manifold, an exhaust manifold, an exhaust gas recirculation passage providing fluid communication between the exhaust manifold and the intake air manifold, a variable geometry turbine positioned downstream of the exhaust manifold, and a waste gate passage providing fluid communication between the exhaust gas manifold and a point downstream of the variable geometry turbine. A control system is provided for controlling exhaust gas recirculation through the exhaust gas recirculation passage by independently controlling a geometry of the variable geometry turbine and thus the casing size of the turbine to control air flow and passage of exhaust gas through a waste gate passage in order to control compressor power which delivers the pressure ratio to the compressor and intake manifold. In doing so, both flow and power are independently controlled in order to maximize efficiency of the system.

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Columbus, IN, United States of America

Steve Charlton