System and method for determining engine friction
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United States of America Patent
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May 7, 2013
Grant Date -
Mar 3, 2011
app pub date -
Sep 1, 2009
filing date -
Sep 1, 2009
priority date (Note) -
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Abstract
An engine control system includes a combustion torque determination module, a friction torque determination module, and a control module. The combustion torque determination module determines a combustion torque of an engine based on pressure inside a cylinder of the engine during an engine cycle. The friction torque determination module determines friction torque of the engine based on the combustion torque, acceleration of an engine crankshaft, effective inertia of the engine crankshaft, and a pumping loss in the cylinder during the engine cycle. The control module adjusts an operating parameter of the engine based on the friction torque.
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