Hybrid powertrain with operator selectable electric propulsion mode

摘要

A powertrain for a vehicle includes an engine and a transmission having an input member, an output member, and a neutral state in which torque is not transmitted from the input member to the output member. A first motor/generator is coupled to the engine. A second motor/generator is coupled with vehicle wheels directly or indirectly through the transmission. The first motor/generator acts as a generator when powered by the engine to provide electric power to the second motor/generator. The second motor/generator acts as a motor when receiving electric power from a battery or from the first motor/generator. A shift selector is moved by a vehicle operator to establish an electric propulsion mode in which the transmission is in the neutral state and the second motor/generator functions as a motor.

主权项

1. A powertrain for a vehicle with wheels comprising:
an engine; a multi-speed transmission having an input member operatively connected to the engine and an output member operatively connected to the wheels and having multiple gear ratios between the input member and the output member and a neutral state in which torque is not transmitted from the input member to the output member; a first motor/generator powered by the engine to function as a generator; an electric energy storage device operable to receive electric power from the first motor/generator; a second motor/generator configured to receive power from either or both of the electric energy storage device and first motor/generator to function as a motor to provide propulsion power to the wheels; and an operator shift selector movable to an electric propulsion position that establishes an electric propulsion mode in which the second motor/generator functions as a motor to provide propulsion power to the wheels and in which the transmission is in the neutral state.