Audi A8 2019 Service Training page 7

Climate control
The climate control system uses R-1234yf as a refrigerant.
In the future, Carbon dioxide (CO ) will be used as a refrigerant. It is referred
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to commercially as R744. It contains neither fluorine nor chlorine and is pro-
duced in a series of natural processes that reduce the possibility of depleting
the earth's ozone layer.
Power transmission
The eight-speed 0D5 transmission has been redesigned for the A8.
The rear final drive 0G2 is used on the rear axle. The quattro with sport differ-
ential drive system with the 0D3 final differential will only be used on the S8.
Body
The body of the Audi A8 follows the Audi Space Frame (ASF) principle. It is
assembled from aluminum parts – the classic composite of cast nodal joints,
extruded profiles and sheet metal. The occupant cell is made from hot-
formed steel components, complemented by an ultra-high-strength, tor-
sionally rigid rear bulkhead made from carbon-fiber composite (CFC). A
magnesium dome strut completes the lightweight construction concept.
Electrical system
The MHEV technology of Audi is based on the newly developed 48 volt elec-
trical system – it supplies the 12 volt electrical system, which in this case is
the electrical subsystem. The 48-volt electrical system is powered by a belt
alternator starter (BAS) which is connected to the engine serpentine drive. A
lithium-ion battery, positioned safely under the luggage compartment floor,
serves as an energy storage device.
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