Patent ID: 7591747
Filing Date: 2009-09-22
Classification: B60K,F16H,Y02T,Y10S

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 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 first gear set with said second member of said second gear set or with said first member of said third gear set; said first motor/generator being continuously connected with a member of said first gear set; said second motor/generator being continuously connected with a member of the first, second or third gear set, or selectively connected via a dog clutch with a member of said second gear set; a first torque transmitting device selectively connecting a member of said first or second gear set with said input member; a second torque transmitting device selectively connecting a member of said first gear set with a member of said third gear set; a third torque transmitting device selectively connecting a member of said third gear set with a member of said first or second gear set; a fourth torque transmitting device selectively connecting a member of the first, second or third gear set with a stationary member; a fifth torque transmitting device connected in parallel with one of said first and second motor/generators for selectively preventing rotation thereof; and wherein said first, second, third, fourth and fifth torque transmitting devices are engagable to provide an electrically variable transmission with a continuously variable range of speed ratios and at least four fixed forward speed ratios.