Hybrid Drive Assembly

WARNING: This page is about a different variant/trim than selected.

Dual Mass Flywheel

The dual mass flywheel is the coupling element between the engine and the transmission and is located in the front of the transmission casing, on the engine side of the transmission. The driven power from the engine crankshaft is transmitted mechanically through the dual mass flywheel and through the engine disconnect clutch to the transmission.

The dual mass flywheel comprises a primary mass, a secondary mass, and intermediate pendulum masses that transmit drive from the engine to the transmission. The drive between the primary and secondary masses is transmitted through a torsional spring damper. The dual mass flywheel provides a rotational torque input to the transmission, through the engine disconnect clutch, while attenuating torsional and transient vibrations produced by the engine.

Crank Integrated Motor Generator

For details of the CIMG and regenerative braking functions refer to Battery, Mounting and Cables and Braking Controls. For additional information, Refer to: BATTERY AND CABLES and BRAKING CONTROL SYSTEM

Engine Disconnect Clutch

The engine disconnect clutch is located within the CIMG and is not a serviceable item. The clutch piston receives pressurized ATF from both the mechanical and electrical ATF pumps through a solenoid operated valve in the Mechatronic valve block.

When the engine disconnect clutch is closed (plates locked together) the CIMG rotor is coupled to the engine. When the engine disconnect clutch is open (plates unlocked) the engine is separated from the CIMG rotor. This clutch allows the PCM to regulate how each power source inputs torque into the transmission to provide the vehicle drive.

Integrated Acceleration Element

The torque applied into the transmission is controlled by the integrated acceleration element. The TCM and the PCM control the operation of the launch clutch. The integrated acceleration element was previously 'Brake B' clutch in the conventional ZF 8HP70 transmission. The launch clutch provides the controlled clutch slip provided by the torque converter in the conventional transmission.