A system and method for controlling a hybrid vehicle having an engine and a traction motor include operating the engine at an operating point selected based on system efficiency, operating the electric machine to provide an electric machine torque responsive to a difference between a driver demand torque and the engine torque associated with the operating point, and limiting a rate of change of the electric machine torque in response to a rate of change of the driver demand torque. The electric machine torque rate limit may vary continuously responsive to the rate of change of driver demand torque and whether the driver demand torque is increasing or decreasing.

Various embodiments of the present disclosure are directed to a drivetrain. In one example embodiment, a motor vehicle drivetrain is disclosed including a transmission arrangement for a motor vehicle with a primary engine. The transmission arrangement including a transmission input shaft which can be connected to the primary engine, and at least one transmission output shaft. The at least one transmission output shaft including a first summation planetary gear unit having primary and secondary first transmission input elements, and a first transmission output element, and a second summation planetary gear unit having primary and secondary second transmission input elements and a second transmission output element. The first transmission output element is connectable to the transmission output shaft via at least one first clutch and the second transmission output element is connectable to the transmission output shaft via at least one second clutch.

Various embodiments of the present disclosure are directed to a drivetrain. In one example embodiment, a motor vehicle drivetrain is disclosed including a transmission arrangement for a motor vehicle with a primary engine. The transmission arrangement including a transmission input shaft which can be connected to the primary engine, and at least one transmission output shaft. The at least one transmission output shaft including a first summation planetary gear unit having primary and secondary first transmission input elements, and a first transmission output element, and a second summation planetary gear unit having primary and secondary second transmission input elements and a second transmission output element. The first transmission output element is connectable to the transmission output shaft via at least one first clutch and the second transmission output element is connectable to the transmission output shaft via at least one second clutch.

A multi-mode hybrid module includes a fluid coupling, an electric motor and a first clutch. The fluid coupling includes a fluid coupling housing, an impeller drivingly connected to the fluid coupling housing, and a turbine arranged for driving connection to a transmission input shaft. The electric motor includes a nonrotatable stator and a rotatable rotor including a rotor carrier. The first clutch is arranged to drivingly connect the rotor carrier directly to the transmission input shaft. In some example embodiments, the first clutch is a dog clutch. In some example embodiments, the multi-mode hybrid module includes a first clutch actuator. The first clutch has an axially slidable sleeve arranged to selectively rotationally connect the rotor carrier and the transmission input shaft, and the first clutch actuator is arranged to displace the axially slidable sleeve to connect and disconnect the rotor carrier and the transmission input shaft.

A multi-mode hybrid module includes a fluid coupling, an electric motor and a first clutch. The fluid coupling includes a fluid coupling housing, an impeller drivingly connected to the fluid coupling housing, and a turbine arranged for driving connection to a transmission input shaft. The electric motor includes a nonrotatable stator and a rotatable rotor including a rotor carrier. The first clutch is arranged to drivingly connect the rotor carrier directly to the transmission input shaft. In some example embodiments, the first clutch is a dog clutch. In some example embodiments, the multi-mode hybrid module includes a first clutch actuator. The first clutch has an axially slidable sleeve arranged to selectively rotationally connect the rotor carrier and the transmission input shaft, and the first clutch actuator is arranged to displace the axially slidable sleeve to connect and disconnect the rotor carrier and the transmission input shaft.

A hybrid module includes a housing with a bulkhead wall, a K0 shaft, a rotor assembly, a rotor carrier and a first bearing. The K0 shaft is arranged for driving connection with a crankshaft. The rotor assembly has an electric motor rotor and a thrust surface for a K0 clutch. The K0 clutch is arranged to drivingly connect the rotor assembly to the K0 shaft. The rotor carrier is fixed to the rotor assembly and the first bearing is arranged to rotationally separate the bulkhead wall and the rotor carrier. In an example embodiment, the first bearing is a deep groove ball bearing. In an example embodiment, the hybrid module includes a seal installed in the bulkhead wall and contacting the K0 shaft. In an example embodiment, the hybrid module includes a bushing installed on the K0 shaft and arranged for contacting an inner bore of the crankshaft.

A hybrid module includes a housing with a bulkhead wall, a K0 shaft, a rotor assembly, a rotor carrier and a first bearing. The K0 shaft is arranged for driving connection with a crankshaft. The rotor assembly has an electric motor rotor and a thrust surface for a K0 clutch. The K0 clutch is arranged to drivingly connect the rotor assembly to the K0 shaft. The rotor carrier is fixed to the rotor assembly and the first bearing is arranged to rotationally separate the bulkhead wall and the rotor carrier. In an example embodiment, the first bearing is a deep groove ball bearing. In an example embodiment, the hybrid module includes a seal installed in the bulkhead wall and contacting the K0 shaft. In an example embodiment, the hybrid module includes a bushing installed on the K0 shaft and arranged for contacting an inner bore of the crankshaft.

A drive train for a hybrid motor vehicle having a gearbox input shaft operatively connected to a first electric machine and an internal combustion engine via a first partial drive train to transmit torque and which is operatively connected to a second electric machine via a second partial drive train to transmit torque. The second electric machine is permanently connected to the gearbox input shaft for torque transmission and the first electric machine and the internal combustion engine can be connected to the gearbox input shaft in a coupleable manner to transmit torque. The first electric machine and the second electric machine are arranged coaxially to one another, and driven shaft of the first electric machine is arranged radially inside a driven shaft of the second electric machine. The driven shaft of the first electric machine is mounted on the driven shaft of the second electric machine via a bearing.

The disclosure relates to a torque transmission device between a first drive element and an output element, having a torque transmission unit; an input, which is rotatable about a rotation axis and can be coupled to the first drive element, and an output, which can be connected to the output element. A separating clutch is arranged outside of the torque transmission unit and the fluid chamber, and is designed for selective torque transmission between the first drive element and the torque transmission unit. The separating clutch has a clutch input and a clutch output that is selectively connectable via a clutch actuating device.

A torque transmitting device for transmitting torque between a first drive element and an output element, having a torque transmitting unit with a housing delimiting a first fluid chamber filled with a liquid, and a separating clutch arranged outside of the torque transmitting unit and the first fluid chamber in a second fluid chamber separated from the first chamber and which selectively transmits torque between the first drive element and the torque transmitting unit. The separating clutch has a clutch output that is connectable to a clutch input via a friction device and a clutch actuator that comprises a pressing element and an actuation element to which fluid pressure can be applied to move the actuation element. The pressing element is arranged within the second fluid chamber, and the actuation element is at least partly arranged within the first fluid chamber so that pressure is applied thereto by fluid pressure.