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

GF27.10-P-0001ACS Automatic transmission (AT), function
- Transmission 722.649


Function description
Transmission 722.6 is an electronically controlled 5-speed transmission with a lockup clutch in the torque converter.

The ratios for the gear stages are achieved by 3 planetary gear sets. The 5th gear is designed with a step-up ratio as an overdrive. Shifting is electronically actuated, whereby the gears are shifted by the corresponding combination of 3 hydraulically actuated multi-disk brakes, 3 hydraulically actuated multi-disk clutches and 2 mechanical overrunning clutches.

Transmission 722.6 can be subdivided into the following assemblies:
- Torque converter with torsional damper and torque converter lockup clutch
- Oil pump for generating the necessary oil pressure and for reliable lubrication of the actuators and bearing points
- 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 drive train CAN (CAN C):
- Intelligent servo module DIRECT SELECT (A80)
- CDI control unit (N3/9) (on diesel engines)
- ME-SFI [ME] control unit (N3/10) (on gasoline engines)

Data is exchanged with the following control units via the chassis CAN (CAN E) with the interface of the CDI or motor electronics control units:
- ESP control unit (N47-5)
- EIS [EZS] control unit (N73)
- Steering column module (N80)
- Central gateway control unit (N93)

Data are exchanged with the following control units with the interface of the central gateway control unit via the interior CAN (CAN B):
- Front SAM control unit with fuse and relay module (/)N10/1
- Rear SAM control unit with fuse and relay module (/)N10/2

Data is exchanged with the following control unit with the interface of the central gateway control unit via the central CAN (CAN F):
- Instrument cluster (A1)

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