GF27.10-P-0001NRT Automatic Transmission (AT), Function
GF27.10-P-0001NRT Automatic Transmission (AT), Function
TRANSMISSION 722.9 in MODEL 211
TRANSMISSION 722.9 in MODEL 230 up to Model Year 2008
TRANSMISSION 722.9 in MODEL 463.303 /340 /341 up to 31.5.12
1 Parking lock gear
2 Turbine wheel
3 Stator
4 Impeller
5 Transmission housing breathing
6 Oil pump
7 Multidisk brake B1
8 Multidisk clutch K1
9 Ravigneaux gear set
10 Multidisk brake B3
11 Multidisk clutch K2
12 A Front single planetary gear system
12 B Rear single planetary gear system
13 Multi-disk brake BR
14 Multidisk clutch K3
15 Multidisk brake B2
16 Torque converter lockup clutch
17 Torque converter housing
18 Pulse ring for measuring rotational speed
19 Ring magnet for measuring rotational speed
20 Ring magnet for measuring rotational speed
21 Electrohydraulic controller unit
22 Range selector lever
Shown on vehicle up to 31.5.04 with engine 113 and code (219) Distronic (DTR)
A1 Instrument cluster
N3/10 ME-SFI [ME] control unit (with gasoline engine)
N15/5 Electronic selector lever module control unit
N47-5 ESP control unit (on model 211) or ESP, SPS [PML] and BAS control unit (on model 230)
N63/1 DTR control unit (with code (219) Distronic (DTR) up to 31.5.04)
N73 EIS [EZS] control unit
N93 Central gateway control unit
Y3/8n4 Fully integrated transmission control (VGS) control unit
CAN-C Controller Area Network bus class C (engine compartment) (CAN C)
General information
Transmission 722.9 is an electronically controlled automatic transmission with 7 forwards and 2 reverse gears. All transmission functions and transmission components have been combined in an assembly module. The integration of the electrohydraulic controller unit (21) in the transmission means that the interfaces to the wiring loom have been minimized. The electrohydraulic controller unit (21) is installed at the bottom of the transmission housing. It is constantly flushed with transmission oil and cooled as a result.
Transmission 722.9 can be roughly divided into the following component groups:
^ Torque converter with torsional damper and torque converter lockup clutch (16)
^ Oil pump (6) for producing the necessary oil pressure and for lubricating the actuators and bearing points
^ Transmission housing made from light metal alloy with mechanical transmission components and electrohydraulic controller unit (21)
^ Mechanical transmission components, consisting of the Ravigneaux gear set (9), the single front planetary gear set (12a), the single rear planetary gear set (12b) and the park pawl
^ Multidisk clutch K1 (8), multidisk clutch K2 (11), multidisk clutch K3 (14), multidisk brake B1 (7), multidisk brake B2 (15), multidisk brake B3 (10) and multidisk brake BR (13). Single-sided lamella are used on the multidisk clutches K1, K2, K3 (8, 11, 14) and the multidisk brake B1 (7) as well as the multidisk brake B3 (10). The friction lining is only coated on one side on this type of lamella. As a result the heat distribution in the clutch pack has been improved and simultaneously compactness has been achieved, the load carrying capacity having been increased the mass having been reduced. Lamella coated on both sides continue to be used for the B2 multi-disk brake (15) and BR multi-disk brake (13).
^ Electrohydraulic controller unit (21), consisting of the electric controller unit (VGS) (Y3/8), valve housing and valve body
The following information is taken into account when shifting the drive positions:
^ Vehicle speed
^ Load condition of the vehicle
^ Driving resistance
^ Position and actuation speed of the accelerator pedal sensor
^ Position of selector lever and engaged gear
^ Position of transmission mode switch
^ Oil temperature and other information about the status of the transmission
^ Further signals which are available via CAN C (CAN C)
Data is exchanged between the following control units via CAN C (CAN C):
^ Instrument cluster (A1)
^ CDI control unit (N3/9) (on diesel engine)
^ ME-SFI [ME] control unit (N3/10) (on gasoline engine)
^ Electronic selector lever module control unit (N15/5)
^ ESP control unit (N47-5) (on model 211) ESP, SPS [PML] and BAS control unit (N47-5) (on model 230) ESP and BAS control unit (N47-5) (on model 463)
^ Except on model 463 with code (219) Distronic (DTR) DTR control unit (N63/1) (up to 31.5.04) or DTR controller unit (A89) (as of 1.6.04)
^ EIS [EZS] control unit (N73)
^ Steering column module (N80)
^ Central gateway control unit (N93) (except on model 463)
^ Fully integrated transmission control (VGS) control unit (Y3/8n4)
This involves the processing of the following data from other systems:
CDI control unit (N3/9)
^ Start-off in 1st gear, aids engine warm-up
^ Shift line displacement, aids engine warm-up
^ Kickdown
^ Shift line displacement, depending on the load condition of the diesel particulate filter (DPF) (with code (474) Particulate filter), a heavily laden diesel particulate filter (DPF) results in a slightly lowered upshift rpm during full load upshifts and kick- down upshifts
^ Specified gear, lower/upper limit, aids engine warm-up
^ Emergency operation of the common rail diesel injection, the pedal value is limited to approx. 20 %, the driveability of the vehicle is assured
^ Cruise control regulates, a special shift strategy for cruise control mode is stored in the fully integrated transmission control (VGS) control unit (Y3/8n4) (up to 31.5.05)
^ Engine coolant temperature is used as a substitute value in the event of failure of the transmission oil temperature sensor
^ Engine torque
^ Requirement torque for Electronic Stability Program (Electronic-Stability-Program) (ESP), torque reduction or torque increase taking into account directional stability and road adhesion
^ Engine oil temperature, shift limitation is canceled
^ Request for torque converter lockup clutch (16) "OPEN" during heating up phase of engine, increase in engine speed
^ Engine idle specified speed for the actuation of the torque converter lockup clutch (16)
^ Rpm limitation function active, adaptations in the fully integrated transmission control (VGS) control unit (Y3/8n4) are switched off
^ Engine speed, for slip calculation of torque converter lockup clutch (16) and for start of pressure calculation by fully integrated transmission control (VGS) control unit (Y3/8n4)
^ Pedal value
ME-SFI [ME] control unit (N3/10)
^ Catalytic converter heating
- Active downshift
- Starting off in 1st gear
- Shift line displacement
- Target gear, lower and upper limit
^ Emergency operation of the ME fuel injection and ignition system (motor electronics) (ME), the pedal value is limited to approx. 20 %, the driveability of the vehicle is assured
^ Engine coolant temperature is used as a substitute value in the event of failure of the transmission oil temperature sensor (VGS)
^ Cruise control regulates, a special shift strategy for cruise control mode is stored in the fully integrated transmission control (VGS) control unit Y3/8n4) (up to
^ Engine oil temperature, shift limitation is canceled
^ Requirement torque for Electronic Stability Program (Electronic-Stability-Program) (ESP), torque reduction or torque increase taking into account directional stability and road adhesion
^ Request torque converter lockup clutch (16) "Open", in the heat-up phase of the catalytic converter (CAT) to increase engine rpm
^ Kickdown
^ Engine idle specified speed for the actuation of the torque converter lockup clutch (16)
^ Engine speed, for slip calculation of torque converter lockup clutch (16) and for start of pressure calculation by fully integrated transmission control (VGS) control unit (Y3/8n4)
^ Rpm limitation function active, adaptations in the fully integrated transmission control (VGS) control unit (Y3/8n4) are switched off
^ Engine torque
^ Pedal value
Electronic selector lever module control unit (N15/5)
^ Selector lever position
^ Status of transmission mode switch
ESP control unit (N47-5), ESP, SPS [PML] and BAS control unit (N47-5) or ESP and BAS control unit (N47-5)
^ Brake light switch, change in shift strategy, brake the vehicle, the fully integrated transmission control shifts down sooner
^ Adjusted braking torque, change of shift strategy, brake the vehicle, fully integrated transmission control shifts earlier
^ Wheel speeds and direction of rotation, substitute values in the event of failure of the output speed sensor
^ ESP request shift into "N" (neutral), power flow interruption, transmission/rear axle
^ Vehicle lateral acceleration at center of gravity, adaptation of shift strategy, detection of dynamic driving style
DTR control unit (N63/1) or DTR controller unit (A89) (except on model 463)
^ Shift line displacement, brake the vehicle, fully integrated transmission control (VGS) shifts down earlier
^ Active downshift, brake the vehicle, fully integrated transmission control shifts down earlier
EIS control unit (N73)
^ Refrigerant compressor ON
^ Circuit 50, influencing fault storage
^ Torque requirement of refrigerant compressor, torque correction
Steering column module (N80)
^ Status of left steering wheel gear shifter and right steering wheel gear shifter (vehicles up to 31.5.06 with code (428) Steering wheel shift buttons)
^ Status of steering wheel gear shifter MINUS and steering wheel gear shifter PLUS (AMG vehicles and vehicles as of 1.6.06 with code (428) Steering wheel shift buttons)
Central gateway control unit (N93) (except on model 463)
^ Refrigerant compressor ON
^ Circuit 50, influencing fault storage
^ Torque requirement of refrigerant compressor
The following information is sent to other systems:
Instrument cluster (A1)
^ Selector lever position for the gear indicator
^ Program selection at the transmission mode switch for the transmission mode display
CDI control unit or ME-SFI [ME] control unit (N3/10)
^ Engine torque requests, engine intervention when shifting
^ Emergency-running mode for fully integrated transmission control
^ Starter lockout release in selector lever position "P", "N"
^ Transmission variant, recognition of basic variants, difference in gear ratios
^ Actual gear engaged/target gear, gear engaged, gear to be shifted, can be shown via STAR DIAGNOSIS
^ Torque converter lockup clutch (16) status
ESP control unit (N47-5), ESP, SPS [PML] and BAS control unit (N47-5) or ESP and BAS control unit (N47-5)
^ Wheel torque factor, overall gear ratio
^ Transmission variant, recognition of basic variants, difference in gear ratios
^ Actual gear engaged/target gear, i.e. engaged gear, gear to be shifted, can be shown via STAR DIAGNOSIS
DTR control unit (N63/1) or DTR controller unit (A89) (except on model 463)
^ Transmission variant, recognition of basic variants, difference in gear ratios
^ Actual gear engaged/target gear, i.e. engaged gear, gear to be shifted, can be shown via STAR DIAGNOSIS
^ Wheel torque factor, overall gear ratio
EIS control unit (N73)
^ Selector lever position for reverse lamp actuation
Central gateway control unit (N93) (except on model 463)
^ Selector lever position for reverse lamp actuation
^ Diagnosis request
