Air Suspension - Audi 243 Service Manual

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.
Electrical connector
Compressor drive
Suction/discharge line
Pressure pipe
Additional noise damper
Temperature sensor G290
Air dryer
Discharge valve N11
• 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).
To the air filter/noise damper
Electric motor
Pneumatic discharge valve
243_028
Valve unit with
pressure sensor G291
Compressor
17