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US Patent 8000865 Method and apparatus for transitioning an electrically variable transmission

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Is a
Patent
Patent
1

Patent attributes

Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
1
Patent Number
80008651
Patent Inventor Names
Brendan M. Conlon1
Jy Jen F. Sah1
Date of Patent
August 16, 2011
1
Patent Application Number
121157691
Date Filed
May 6, 2008
1
Patent Citations Received
‌
US Patent 11906044 Gear seeking polystable shifter
2
Patent Primary Examiner
‌
Tuan C To
1
Patent abstract

A method is provided for transitioning from an initial to a final transmission mode in an electrically variable transmission (EVT), and includes transitioning to an intermediate mode having an additional speed degree of freedom (DOF), changing a transmission ratio, and engaging a clutch to shift to the final mode. The modes include input and compound split, fixed gear ratio, and electric torque converter (ETC), with and without input from an engine. Output torque is maintained by adjusting a charge on an energy storage device. A brake grounds an input member of the EVT. The EVT has the input member, an output member, a stationary member, and first and second motor/generators. An algorithm transitions between modes by releasing at least one clutch to transition to a mode having an extra speed degree of freedom (DOF), and utilizing the extra speed DOF to change the ratio of the EVT.

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