GF27.10-P-0001AHI Automatic Transmission (AT), Function

GF27.10-P-0001AHI Automatic Transmission (AT), Function
TRANSMISSION 722.930 in MODEL 230.4

Automatic transmission (AT), general
Transmission 722.9 is an electronically controlled automatic transmission with 7 forward gears and 2 reverse gears. The ratios for the gear stages are achieved by planetary gear sets. All the transmission functions and components for this transmission are combined in one assembly module.

The integration of the electric controller unit (VGS) (Y3/8) in the transmission means that the interfaces to the wiring harness have been minimized. This improves the shift quality, increases the service life and reliability and also lowers maintenance costs.

The transmission can be subdivided into the following assemblies:
- Start-up clutch with torsional damper
- Oil pump for generating the necessary oil pressure and for reliable lubrication of the actuators and bearing points
- Oil cooling system for optimized short-term carrying off of heat
- Transmission housing with mechanical transmission components (planetary gear sets, park pawl, multidisk clutches and multidisk brakes) and controller unit

Data is exchanged with the following control units via the engine compartment CAN (CAN-C):
- Instrument cluster (A1)
- ME-SFI [ME] control unit (/)N3/10
- Electronic selector lever module control unit (/)N15/5
- ESP, SPS [PML] and BAS control unit ()N47-5
- EIS [EZS] control unit (N73)
- Steering column module (N80)
- Drive Unit control unit (N145)

Data is exchanged with the following control unit via the interior CAN (CAN B) with the interface of the central gateway control unit (N93):
- Drive Unit control unit (N145)

Further partial functions are described in separate documents:
^ Transmission control, function
^ Shift-lock, function
^ Gear shift, function
^ Power flow, function