Hybrid powertrain system having selectively connectable engine, motor/generator, and transmission

A hybrid powertrain system comprising:

• an engine;
• a transmission operatively connected to a final drive and not continuously connected with said engine;
• a first energy storage device;
• a motor/generator operatively connected to said first energy storage device and not continuously connected to said engine or said transmission, said motor/generator configured to transmit power to and receive power from said first energy storage device;
• a first torque transmitting device operatively connected to said engine;
• a second torque transmitting device operatively connected to said transmission, wherein said first and second torque transmitting devices are operable for selectively interconnecting said engine and said transmission to transmit power therebetween;
• a third torque transmitting device operatively connected to said motor/generator, wherein said first and third torque transmitting devices are operable for selectively interconnecting said engine and said motor/generator to transmit power therebetween, wherein said second and third torque transmitting devices are operable for selectively interconnecting said transmission and said motor/generator to transmit power therebetween, and wherein said first, second, and third torque transmitting devices are operable for selectively interconnecting said engine, said transmission and said motor/generator to transmit power therebetween;
• a transmission pump operatively connected to said first, second, and third torque transmitting devices and not continuously connected to said engine, said motor/generator, or said transmission, and configured to be selectively powered by at least one of said engine, motor/generator, and transmission;
• wherein said third torque transmitting device is a spring-applied clutch configured to permit said motor/generator to power said transmission pump during engine off-state and start-up;
• and
• wherein said hybrid powertrain is characterized by an absence of more than one motor/generator operable to provide power to said transmission.

A powertrain system for a hybrid vehicle, comprising:

• an internal combustion engine;
• a multi-speed transmission operatively connected to a final drive and not continuously connected to said engine;
• an energy storage device;
• a single motor/generator operatively connected to said energy storage device and not continuously connected to said engine or said transmission, said motor/generator configured to transmit power to and receive power from said energy storage device;
• a controller operatively connected to said motor/generator and configured to control desired modes and output of said motor/generator
• a first clutch operatively connected to said engine;
• a second clutch operatively connected to said first clutch and said transmission, wherein said first and second clutches are operable for selectively interconnecting said engine and said transmission to transmit power therebetween;
• and
• a third clutch operatively connected to said first and second clutches and said motor/generator, wherein said first and third clutches are operable for selectively interconnecting said engine and said motor/generator to transmit power therebetween, wherein said second and third clutches are operable for selectively interconnecting said transmission and said motor/generator to transmit power therebetween, wherein said first, second and third clutches are operable for selectively interconnecting said transmission, engine, and motor/generator to transmit power therebetween, and wherein said transmission does not receive power from said engine when said second clutch is not engaged.