Shifting procedure for powersplit systems
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United States of America Patent
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Feb 2, 2016
Grant Date -
Jun 13, 2013
app pub date -
Dec 7, 2012
filing date -
Dec 9, 2011
priority date (Note) -
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Abstract
A method for shifting a transmission capable of operating in a hydrostatic power transmission mode or a blended hydrostatic and mechanical power transmission mode is provided. The transmission includes a mechanical portion and a hydraulic portion. The method comprises the steps of placing the transmission in the hydrostatic power transmission mode, reducing an amount of engagement of a primary clutch, adjusting a rotational speed of the hydraulic portion, increasing an amount of engagement of a secondary clutch, and engaging the secondary clutch and disengaging the primary clutch. The method for shifting the transmission minimizes torque interruption, increases a fuel efficiency of a vehicle, and increases a range of operating speeds of the vehicle the transmission is incorporated in.
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