Patent ID: 7387586
Filing Date: 2008-06-17
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 or selectively 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 second gear set with said second member of said first or third gear set; said first motor/generator being continuously connected with a member of said first or second gear set; said second motor/generator being continuously connected with a member of said second or third gear set; a first torque transfer device selectively connecting a member of said first or second gear set with said input member or with a member of the third gear set; a second torque transfer device selectively connecting a member of said third gear set with another member of said first, second, or third gear set; a third torque transmitting device selectively connecting a member of said second or third gear set with a stationary member; fourth torque-transfer device selectively connecting a member of said first or second gear set with the stationary member; a fifth torque transfer device connected in parallel with one of the first and second motor/generators for selectively preventing rotation of the motor/generator; and wherein said first, second, third, fourth and fifth torque transfer devices are engageable to provide an electrically variable transmission with a continuously variable range of speed ratios, at least four fixed forward speed ratios, battery reverse, and at least one mechanical reverse speed ratio wherein neither of the motor/generators are engaged.