by one of the motor generators the other motor generator operates in generator mode and transfers 100 of the generated energy back to the driving motor the net effect is to drive the vehicle in reverse referring to fig1 b for example in the evt reverse mode the clutch 50 is engaged the generator 80 has a torque of u2212 3 27 units the motor 82 has a torque of u2212 2 56 units and an output torque of u2212 8 33 is achieved corresponding to an engine torque of 1 unit the third operating mode includes the u201c reverse and forward launch modes u201d also referred to as u201c torque converter reverse and forward modes u201d corresponding with the third and fourth rows tc rev and tc for of each operating mode table such as that of fig1 b in this mode the evt is driven by the engine and one of the motor generators a selectable fraction of the energy generated in the generator unit is stored in the battery with the remaining energy being transferred to the motor in fig1 this fraction is approximately 99 the ratio of transmission output speed to engine speed transmission speed ratio is approximately u2212 0 001 the positive sign indicates that the vehicle is creeping forward and negative sign indicates that the vehicle is creeping backwards referring to fig1 b in the reverse and forward launch modes the clutch 50 is engaged in the tc reverse mode the motor generator 80 acts as a generator with u2212 2 85 units of torque the motor generator 82 acts as a motor with u2212 2 15 units of torque and a torque ratio of u2212 7 00 is achieved in the tc forward.