International Engine Intellectual Property Company, LLC

John E Bernhardt

Michael James McNulty

Emad S Isaac

Christopher R Ciesla

Michael J Mcnulty

An internal combustion engine () has a fueling system comprising fuel injectors () that utilize oil under pressure to force fuel into engine combustion chambers. Oil is pumped to an oil rail () by an engine-driven pump () whose effective displacement can be varied. A control system () processes certain data, such as engine speed and load, for controlling the effective displacement of the pump. The pump has a larger stage (B) and a smaller stage (A). The control system selects and de-selects the stages to control pump displacement.

Control strategies for a variable displacement oil pump

A variable nozzle turbocharger ( ) creates engine boost. Boost is controlled by controlling the position of vanes within turbocharger. A processor develops a control signal ( ) for controlling vane position. The processor develops a value for desired boost and processes that value with a value. corresponding to the amount of boost being created by the turbocharger to generate error data ( A) defining error between the amount of boost being created by the turbocharger and the desired boost, and the processor develops a component of the control signal by P-LI-D processing ( ) of the error data. Other components of the control signal are a feed-forward value from a look-up table ( ) and a value from an overspeed protection function ( ).

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Evergreen Park, IL, United States of America

John E Bernhardt