Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
April 8, 2008
Patent Application Number
11047541
Date Filed
January 31, 2005
Patent Citations Received
Patent Primary Examiner
Patent abstract
A method for achieving high quality shifts with one hydraulic unit near zero displacement when using dog clutches. This method includes selecting the proper displacement and vocation (whether the hydrostatic unit works as a pump or motor) of a low displacement hydraulic unit during the shift, selecting the appropriate speed differential between the clutch elements, selecting the proper vehicle speed at which to make the shift, and sequencing the displacement changes of the hydraulic units with a controller in order to achieve the desired shift conditions.
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