Component Description For Battery Management System Control Unit - GF54.10-P-3012KJE
MODEL 453.091/391/491 with ENGINE 780
Location
The battery management system control unit (N82/2) is in the high-voltage battery.
The high-voltage battery is located below the passenger compartment.
The battery management system control unit and the high-voltage battery form a unit and cannot be replaced separately.
Task
- Reading in of interlock signal
- Read in of crash signal
- Monitoring of temperatures, voltages and currents of high-voltage battery
- Control of charging and discharging processes of high-voltage battery
Interlock circuit
The interlock circuit is used as contact protection to protect people against inadvertent contact with high-voltage components. The interlock is an anticipatory contact which opens a little before the high-voltage connections when opening a high-voltage connection. In this way timely discharging of the high-voltage intermediate circuit is achieved by the control units of the high-voltage components.
In order to do this, a 12 V/88Hz interlock signal is looped through all components of the high-voltage on-board electrical system that are can be removed or opened. To do this there is an electrical bridge in each removable high-voltage connection which interrupts the interlock circuit during removal of the high-voltage connection.
These tasks are subdivided as follows:
- Reading in of sensors and signals
- Evaluation of input factors
- Actuation of components
Reading in of sensors and signals
These input factors are read in via the following connections:
- Direct line
- Electric drive CAN (CAN EL)
Evaluation of input factors
The read-in input factors are evaluated by the battery management system control unit.
Actuation of components
The actuation of the components takes place via the following connections:
- Direct line
- Electric drive system CAN
Input factors and output factors for the following components are read in or output over direct lines by the battery management system control unit:
| Input factors over a direct line | Initial parameters over a direct line | Supplemental information |
|---|---|---|
| High-voltage DC + | High-voltage DC + | - |
| High-voltage DC - | High-voltage DC - | - |
| High-voltage interlock for high-voltage disconnect device (S8) | - | - |
| Circuit 30 | - | - |
| Circuit 31 | - | - |
| Actuation of battery management system control unit (N82/2k1) relay 1 (precharge) | - | - |
| Actuation of battery management system control unit (N82/2k2) relay 2 (phase signal) | - | - |
| Actuation of battery management system control unit (N82/2k3) relay 3 (neutral conductor) | - | - |
| Input factors over electric drive-CAN | Initial parameters over electric drive-CAN | Supplemental information |
|---|---|---|
| Electric drive control unit (N127) | Electric drive control unit (N127) | Includes signals from other control units that are connected via electric drive CAN (CAN EL). |
| Battery management system control unit (N82/2) | Battery management system control unit (N82/2) | |
| DC/DC converter control unit (N83/1) | DC/DC converter control unit (N83/1) | |
| Charging process monitoring control unit (N83/2) | Charging process monitoring control unit (N83/2) | |
| High-voltage battery charger (7 kW charger) control unit (N83/5) | High-voltage battery charger (7 kW charger) control unit (N83/5) |
Structure
The battery management system control unit consists of a metal housing with three plug connectors and an internal control unit.
Voltage supply
The battery management system control unit is supplied with power from "circuit 30 fused".
| Wiring diagram for battery management control unit | PE54.10-P-2104-97BEA |