Patent ID: 7059986

Claim:
An electromechanical powertrain including a transmission comprising: a fuel cell power source; an electrical energy storage means; an electronic control unit connected between said fuel cell power source and said electrical energy storage means; a transmission output shaft; a transmission housing; a first electrical power transfer machine electrically connected with both said fuel cell power source and said electrical energy means through said electronic control unit; a second electrical power transfer machine electrically connected with both said fuel cell power source and said electrical energy means through said electronic control unit; power take-off means for supplying power to operate accessories; a first planetary gearset having a first member continuously rotatable with said first electrical power transfer machine, a second member continuously rotatable with said output shaft, and a third member continuously rotatable with said power take-off means; a second planetary gearset having a first member continuously rotatable with said second electrical power transfer machine, a second member continuously rotated with said second member of said first planetary gearset and with said output shaft, and a third member; a first torque-transmitting mechanism selectively connectable between said transmission housing and said third member of said second planetary gearset; a second torque-transmitting mechanism selectively connectable between said third member of said second planetary gearset and said output shaft; a third torque-transmitting mechanism selectively connectable between said third member and said second member of said first planetary gearset to provide a 1:1 drive from said first electrical power transfer machine to said power take-off means; and said first torque-transmitting mechanism being engaged for a first range of operation, said second torque-transmitting mechanism being engaged for a second range of operation, and said third torque-transmitting mechanism being engaged to cause unitary rotation of said first electrical power transfer machine, said power take-off means and said output shaft, and operating in cooperation with the engagement of said second torque-transmitting mechanism to cause conjoint rotation of said first electrical power transfer machine, said second electrical power transfer machine, said power take-off means, and said output shaft.