Patent ID: 7396305
Filing Date: 2008-07-08
Classification: B60K,F16H,Y02T

Abstract:
1. An electrically variable transmission comprising: an input member to receive power from an engine; an output member; first and second motor/generators; first, second and third differential gear sets each having first, second and third members; said input member being continuously connected with at least one member of said gear sets, and said output member being continuously connected with another member of said gear sets; a first interconnecting member continuously connecting said first member of said first gear set with said first member of said second gear set; a second interconnecting member continuously connecting said second member of said first gear set with said first member of said third gear set; a third interconnecting member continuously connecting said second member of said second gear set with said second member of said third gear set; a fourth interconnecting member continuously connecting a member of said first gear set with a stationary member; said first motor/generator being continuously connected with a member of said first, second or third gear set; said second motor/generator being continuously or selectively connected with a member of said second or third gear set; a first torque transfer device selectively connecting a member of said first gear set with a member of said second gear set; and a second torque transmitting device connected in parallel with one of said motor/generators for selectively preventing rotation thereof; wherein said first and second torque transfer devices are engagable to provide an electrically variable transmission with a continuously variable range of speed ratios and at least two fixed forward speed ratios.