General
The 48 V on-board electrical system supplies all 48 V consumer (consumers with high energy requirement) with electrical energy. It also provides the electrical energy for starting the combustion engine with the starter-alternator. When the combustion engine is running, the starter-alternator generates the electrical energy for charging the 48 V battery. Depending on the version, the starter-alternator is either driven via a belt or integrated into the drivetrain.
The 48 V on-board electrical system supplies the 12 V on-board electrical system with electrical energy from the 48 V on-board electrical system battery via the DC/DC converter. No 12 V alternator is installed.
P54.10-A060-07
Schematic diagram of 48 V on-board electrical system |
1 | 48 V battery (stores and supplies energy) | 4 | Integrated starter alternator (generates energy (in both generator mode and for driving)) | |
2 | DC/DC converter control unit (records energy state of 48 V battery, transfers energy between 48 V on-board electrical system and 12 V on-board electrical system) | 5 | Starter-alternator control unit (sets operating mode of integrated starter alternator (4), rectifies generated alternating voltage) | |
3 | Belt-driven starter alternator (generates energy (in both generator mode and for driving)) | 6 | 48 V consumer (e.g. electric refrigerant compressor) |