17
Air supply
The compressor
The construction and function of the
compressor corresponds largely to the unit
described in the self-levelling suspension of
the A6. The following is a description only of
the differences in the 4-level air suspension
system in the Audi allroad quattro
• The fitting location is outside the vehicle
and without noise insulation (in front of
spare wheel well).
• The operating pressure is increased to
16 bar owing to the pressure accumulator
system.
243_028
• Lower speed for reduced noise.
• Suction and discharge of the air is
performed from the spare wheel well via
an air filter/noise damper (passenger
compartment).
• An additional noise damper in the suction/
discharge line ensures minimal through-
flow noise, particularly during discharge.
• Temperature monitoring is performed via
a temperature sensor at the cylinder head
and a simulation formula in the control
unit (temperature model) (more
information, see Temperature sensor
G290).
Compressor
Valve unit with
pressure sensor G291
Pneumatic discharge valve
Discharge valve N11
Air dryer
Temperature sensor G290
Additional noise damper
To the air filter/noise damper
Electric motor
Pressure pipe
Suction/discharge line
Electrical connector
Compressor drive
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