Electric Refrigerant Compressor - SMART Fortwo 451 Series Introduction Into Service Manual

Electric refrigerant compressor

The drive system for the refrigerant compressor
has to be kept separate from the drive motor so
that sufficient cooling output can be provided
when the vehicle and the electric motor are
stationary. This ensures that the high-voltage
battery can be cooled independently and climate
control for the vehicle interior can operate inde-
pendently. This is achieved by means of an elec-
trically driven refrigerant compressor.
46 Introduction of smart fortwo electric drive (3rd Generation) • Model Series 451
The electric refrigerant compressor is a high-
voltage component and contains an inverter for
powering a spiral compressor, which is driven by
an electric motor, as well as an integrated control
unit. The control unit of the electric refrigerant
compressor regulates the speed of the electric
motor to the value set by the heater/AC operating
unit. The control unit communicates with the driv-
etrain control unit via LIN. This only acts as a
router for the CAN signals from the heater/AC
operating unit in this case.
On vehicles with code (V03) Battery cooling
system, the electric motor is also regulated
depending on the cooling output request of the
high-voltage battery.
1 High-voltage connection
2 Pressure line
3 Intake line
4 12 V on-board electrical system/LIN connector
A9/6 Electric refrigerant compressor
P83.55-2216-00