Hybrid Drive Unit: Overview
| Item | Description |
|---|---|
| 1 | Input shaft |
| 2 | Disconnect clutch assembly |
| 3 | Engine disconnect clutch pressure sensor |
| 4 | Electric drive motor |
| 5 | Torque converter |
The hybrid drive unit has an input shaft directly splined to the engine dual mass flywheel. When the engine is running the input shaft rotates an engine disconnect clutch that is hydraulically locked by fluid pressure from the transmission fluid auxiliary pump. The transmission fluid pressure supplied by the transmission fluid auxiliary pump is monitored by a pressure sensor when the engine disconnect clutch is locked. When the engine disconnect clutch is in a locked state the torque converter is driven by being directly locked to the engine flywheel. When the engine is not running the fluid auxiliary pump is turned off to switch the engine disconnect clutch to an unlocked state and the torque converter is driven by the electric drive motor.
The hybrid drive unit has three different driving modes:
- Electric only drive
- Gas engine only drive
- Combined electric and gas engine drive (boost mode)
The hybrid drive unit is used in two different vehicle versions:
- Full hybrid electric vehicle (FHEV)
- Smaller battery and electric motor
- Plug-in hybrid electric vehicle (PHEV)
- Larger battery and electric motor