Audi A8 2019 - Page 7

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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.
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 dier-
ential drive system with the 0D3 final dierential will only be used on the S8.
Climate control
The climate control system uses R-1234yf as a refrigerant.
In the future, Carbon dioxide (CO
2
) will be used as a refrigerant. It is referred
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.
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.