Component Description For DC/DC Converter Control Unit - GF54.10-P-3006FH
Model 238
Up To Model Year 2021
With Code B01 (48V technology)
Shown On Model 238.3
Location
DC/DC converter control unit is located on the 48 V on-board electrical system battery in the engine compartment in front of the top right firewall below an air intake scoop.
Tasks
The DC/DC converter control unit consists of an output unit and a logic section. The output unit connects the 12 V on-board electrical system to the 48 V on-board electrical system, and it enables energy to be transferred in both directions. The logic section is responsible for communication with other control units and for actuation of the output unit.
The DC/DC converter control unit is responsible for the following additional tasks:
- Reading in of sensors and signals
- Evaluation of input factors
- Sending signals
Reading in of sensors and signals
The input factors are read in via the following connections:
- Battery sensor-LIN (LIN B15)
- 48 V on-board electrical system LIN (LIN B22)
- Interior CAN (CAN B)
Battery sensor LIN
The DC/DC converter control unit reads in the signals of the following components via the battery sensor LIN:
- Battery sensor (B95) (except for code U98 (LITHIUM-ION STARTER BATTERY (LISB)))
- On-board electrical system battery (G1) (with code U98 (LITHIUM-ION STARTER BATTERY (LISB)))
48 V on-board electrical system LIN
The DC/DC converter control unit reads in the signals from the 48 V on-board electrical system battery (G1/3) over the 48 V LIN.
Interior CAN
The DC/DC converter control unit also reads in the following signals over the interior CAN:
- Circuit 15 status
- Engine running status
- Starter-alternator status
- Starter-alternator voltage actual value
- Starter-alternator current actual value
- Charging voltage specified value
- On-board electrical system battery voltage actual value
- Battery current switch status
- Vehicle speed
- Status of driver door (open or closed)
Evaluation of input factors
The read-in input factors are evaluated by the integrated microprocessor and the output unit in the DC/DC converter control unit is then actuated.
Sending signals
The DC/DC converter control unit also sends the following signals over the interior CAN:
- Operating rate of DC/DC converter
- DC/DC converter current
- Temperature of DC/DC converter
- Charge level of 48 V on-board electrical system battery
- Temperature of 48 V on-board electrical system battery
- Current of 48 V on-board electrical system battery
- Voltage of 48 V on-board electrical system battery
The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).
| Wiring diagram for DC/DC converter control unit | PE54.10-P-2105-97DCA |