Electric Differential Lock (EAGGS), Function - GF35.40-P-0002FG
Model 213
up to model year 2021
with code 467 (Electronic locking differential)
Block diagram
The following table provides an overview of the vehicle model and major assembly overviews:
| Sales designation | Model | Motor | Automatic transmission | Rear axle gear | Notes |
|---|---|---|---|---|---|
| E 63 AMG 4MATIC sedan | 213.088 | 177.980 | 725.092 | 215 | with code 467 (Electronic differential lock) |
| E 63 AMG S-MODEL 4MATIC sedan | 213.089 | 177.980 | 725.092 | 215 | with code 467 (Electronic differential lock) |
| E 63 AMG 4MATIC wagon | 213.288 | 177.980 | 725.092 | 215 | with code 467 (Electronic differential lock) |
| E 63 AMG S-MODEL 4MATIC wagon | 213.289 | 177.980 | 725.092 | 215 | with code 467 (Electronic differential lock) |
Function requirements for electric differential lock (EAGGS), general
- Wheel speed signal present
- Drivetrain operational signal
- On-board power supply voltage
- Ignition terminal status
To check that the function requirements are met, the electric differential lock control unit reads in the following signals via the AMG CAN and the AMG sports suspension control unit or drive unit control unit:
- Wheel speed signal via suspension FlexRay and Electronic Stability Program control unit
- Drivetrain signal operational via drive train CAN and powertrain control unit
- On-board electrical system voltage and ignition terminal status via user interface CAN and electronic ignition lock control unit
Electric differential lock, general
The electric differential lock is integrated in the rear axle differential. It improves traction and also increases driving stability when accelerating from standstill, while cornering or when changing lanes quickly. This guarantees greater responsiveness and more accurate handling. A multidisk clutch operated via actuation of the differential lock actuator is used to reduce the differences in speed or wheel slip. As a result, the locking effect can always be adapted to suit the current driving situation.
Sectional view of differential lock
Function sequence of electric differential lock
The electric differential lock control unit actuates the differential lock actuator, which closes the differential lock via the sprocket (3), adjustment ring (2), balls (1), ramp disk (4), needle roller bearing (5), thrust ring (6), thrust pieces (7), pressure plate (8) and multidisk clutch (9). The differential lock actuator Hall sensor integrated in the differential lock actuator reports the position, and the differential lock actuator temperature sensor, which is also integrated, reports the temperature of the differential lock actuator back to the Electronic Stability Program control unit via the AMG CAN, AMG sports suspension control unit, or the drive unit control unit and suspension FlexRay. Over the same path the electric differential lock control unit transmits the locking ratio of the electronic differential lock and the status of the differential lock actuator back to the Electronic Stability Program control unit.
Reading of signals and actuation of components
The following signals are processed by the electric differential lock control unit:
Supplemental restraint system control unit
- Yaw rate
- Vehicle acceleration
AMG sports suspension control unit or drive unit control unit
- Transmission mode selection status, individual mode
Electronic Stability Program control unit
- ESP® display mode
- Transmission mode selection status, individual mode
- Brake system status
- Electric differential lock locking ratio request
ME-SFI [ME] control unit
- Engine running status
- Drivetrain status
Fully integrated transmission control unit
- Transmission oil temperature
The following components are actuated by the electric differential lock control unit:
- Differential lock actuator
- Instrument cluster
- Diagnostic connector
The Supplemental Restraint System control unit transmits the "yaw rate" and "vehicle acceleration" signals via the vehicle dynamics CAN to the Electronic Stability Program control unit as well as via the suspension FlexRay, AMG sports suspension control unit or the drive unit control unit and AMG CAN to the electric differential lock control unit. After receiving the above signals, the Electronic Stability Program control unit transmits the request for the locking ratio of the differential lock via the suspension FlexRay, AMG sports suspension control unit or drive unit control unit, and AMG CAN to the electric differential lock control unit.
The Electronic Stability Program control unit transmits the signals for ESP® mode display, transmission mode selection status individual mode and the brake system status via the suspension FlexRay, AMG sports suspension control unit or drive unit control unit and AMG CAN to the electric differential lock control unit.
The ME-SFI [ME] control unit transmits the signals for engine running status and drivetrain status via the drive train CAN, AMG sports suspension control unit or the drive unit control unit and AMG CAN to the electric differential lock control unit.
The fully integrated transmission control unit transmits the transmission oil temperature via the drive train CAN, AMG sports suspension control unit or drive unit control unit and AMG CAN to the electric differential lock control unit.
The DYNAMIC SELECT switch allows the driver to choose between one "Individual" and various pre-configured transmission modes. The driver chooses the required transmission mode by operating the DYNAMIC SELECT switch and receives operation feedback in the instrument cluster and the head unit. The status of the DYNAMIC SELECT switch is read in by the left lower control panel. The left lower control panel transmits the signal via the LCP LIN, the Audio/COMAND control panel, the telematics CAN, the head unit, the user interface CAN, the electronic ignition lock control unit, the suspension FlexRay and the AMG sports suspension control unit or the drive unit control unit to the Electronic Stability Program control unit. The Electronic Stability Program control unit puts the information for the chosen transmission mode on the chassis FlexRay. The control units relevant for the new transmission mode receive the information and switch to the stored parameters for the particular transmission mode. The temperature in the rear axle differential is monitored by the electric differential lock temperature sensor. The signal is read in directly by the electric differential lock control unit.
In the event of temporary or permanent system failures, a fault message is output in the instrument cluster. The signal for the display message is transmitted by the AMG sports suspension control unit or the drive unit control unit and user interface CAN to the instrument cluster.
Diagnostic communications of the differential lock actuator take place via the electric differential control unit, the AMG CAN, AMG sports suspension control unit or drive unit control unit, user interface CAN, electronic ignition lock control unit, diagnostic CAN and diagnostic connector.
| Overview of system components of electric differential lock (EAGGS) | GF35.40-P-9999FG |