Component Description For Battery Management System Control Unit - GF54.10-P-3012GRH
MODEL 166 with ENGINE 276.821
Shown on model 166.063
Shown on high-voltage battery module
Location
The battery management system control unit is integrated into the high voltage battery module.
Interlock circuit
- Current flow
- Temperature
- State of contactor
The battery management system control unit is connected through the hybrid CAN (CAN L) to the vehicle's CAN network and exchanges data with the other control units.
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/88 Hz interlock signal is looped through all high voltage on-board electrical system components that 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. The interlock circuit is also switched in series via the 12-V control unit plug connections of the high-voltage components.
Tasks
The battery management system control unit operates in an electrical network with the sensors and actuators of the high-voltage on-board electrical system to provide battery management of the high-voltage system.
The battery management system constantly determines and monitors the following high-voltage battery data:
- Interlock circuit
- Voltage
Input and output signals
- Direct input/output signals
- Output connectors
- CAN input/output signals
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 |
|---|---|---|
| Terminal 15 | - | - |
| Terminal 30 | - | - |
| Circuit 30c (Crash signal from battery compartment prefuse box (F33) over high-voltage disconnect device (S7)) | - | - |
| Crash signal | - | - |
| Circuit 31 | - | - |
| Interlock circuit | Interlock circuit | - |
| High-voltage battery (A100g1) | High-voltage battery (A100g1) | - |
| High-voltage battery coolant inlet temperature sensor (A100b1) | - | - |
| High-voltage battery cell temperature sensors (A100b2) | - | - |
| - | Contactor (A100s1) | - |
The following components are connected to the battery management system control unit via power connections:
| Output connections + | Output connections - | Supplemental information |
|---|---|---|
| Power electronics control unit (N129/1) (discharge current from high-voltage battery (A100g1)) | Power electronics control unit (N129/1) (discharge current from high-voltage battery (A100g1)) | - |
| Power electronics control unit (N129/1) (charging current to high-voltage battery (A100g1)) | Power electronics control unit (N129/1) (charging current to high-voltage battery (A100g1)) | - |
| Charger (N83/5) (charging current to high-voltage battery (A100g1)) | Charger (N83/5) (charging current to high-voltage battery (A100g1)) | - |
| DC/DC converter control unit (N83/1) (discharge current of high-voltage battery (A100g1)) | DC/DC converter control unit (N83/1) (discharge current of high-voltage battery (A100g1)) | - |
Input factors and output factors for control units are sent or received by the power electronics control unit via LIN or CAN:
| Input factors through battery sensor-LIN 2 (LIN B15-2) | Initial parameters through battery sensor-LIN 2 (LIN B15-2) | Supplemental information |
|---|---|---|
| - | Low-temperature circuit switchover valve 2 (Y73/2) | - |
| Input factors via hybrid CAN (CAN L) | Starting data via hybrid CAN (CAN L) | Supplemental information |
|---|---|---|
| DC/DC converter control unit (N83/1) | DC/DC converter control unit (N83/1) | - |
| Charger (N83/5) | Charger (N83/5) | - |
| Powertrain control unit (N127) | Powertrain control unit (N127) | Contains signals of further control units which are connected via the CAN network. |
| Power electronics control unit (N129/1) | Power electronics control unit (N129/1) | - |