Patent ID: 7422535
Filing Date: 2008-09-09
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 and second differential gear sets each having first, second and third members; said input member not being continuously connected with any member of said gear sets, and said output member being continuously connected with a member of said gear sets; said first motor/generator being continuously connected with a member of said first gear set or alternately connected with two of a member of the first gear set, a member of the second gear set, and said input member; said second motor/generator being continuously connected with a member of said first or second gear set; a first torque transmitting device selectively connecting a member of said first gear set with said input member; a second torque transmitting device selectively connecting a member of said second gear set with said input member; a third torque transmitting device selectively connecting a member of said first gear set with a member of said second gear set or with a stationary member; a fourth torque transmitting device connected in parallel with one of said first and second motor/generators for selectively preventing rotation thereof; wherein said first, second, third and fourth torque transmitting devices are engageable to provide an electrically variable transmission with a continuously variable range of speed ratios and at least one fixed forward speed ratio; and wherein no member of said first gear set is continuously connected to any member of said second gear set.