Method and apparatus for retarding an engine
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United States of America Patent
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Dec 14, 2010
Issued Date -
N/A
app pub date -
Dec 20, 2007
filing date -
Dec 21, 2006
priority date (Note) -
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Abstract
A method and system for retarding an engine of a machine is provided. The machine has a hydraulic pump driven by the engine, a motor driven by the hydraulic pump, and a fan driven by the motor. The method includes sensing the operating speed of the engine with an engine speed sensor. The method also includes operating the motor at a first pressure. The method also includes comparing the operating speed to a trigger speed. The method also includes operating the motor at a second pressure greater than the first pressure if the operating speed of engine exceeds the trigger speed by a predetermined value.
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