SSP 994303 Audi Adaptive Air Suspension.pdf

(2229 KB) Pobierz
Adaptive Air Suspension
Today, designing a chassis must
overcome conflicting requirements. A car
designed to be very comfortable when
driven at the limit, falls short in terms of
driving safety. On the other hand, a car
with exceptional sport tuning achieves
considerably higher cornering speeds
and reaches its limit much later, but is
usually very limited in comfort.
The equipment must deliver not only
universal purposes such as function, safety,
strength and durability, but also comfort,
reduced weight and premium acoustics. To
satisfy these contrary requirements, the
2004 Audi A8L is equipped with a new, fully
load-bearing, Air Suspension System with
electronic dampening control.
Contents
Introduction .............................................................. 1
Basics, New technology
Operation and display ............................................... 2
Vehicle levels, Operation and display system
System components ................................................. 3
Vehicle overview, Control unit J197, Suspension/shock
absorber strut, Shock absorber, Air supply unit, Solenoid valve
block, Accumulator, Pneumatic diagram, Pressure build-up,
Pressure reduction, Senders (sensors)
System functions ...................................................... 4
Control concept for standard running gear, Control concept for
sporty running gear, Control concept for special operating
conditions
Interfaces .................................................................. 5
System overview of components with bus link (CAN, MOST),
System overview of components without bus link, CAN
information exchange, Function diagram, Other interfaces
Service ...................................................................... 6
Control unit code, System initialization, Final control diagnosis,
Measured value blocks
New !
This Self- Study Program (SSP) is not a Repair
Manual. Its purpose is to describe new designs and
functions. All values in this program are meant to
help your understanding of the program and are
based on the software version that was valid at the
time the SSP was developed.
For service and repair work, use the current technical
literature.
3
Important/Note!
Operation and display
Introduction
The basics of Air Suspension Systems are
described in SSP 242 and 243 and are
relevant to the 2004 A8L system.
New Technology
The 2004 A8L introduces a new Adaptive
Air Suspension with innovative technical
content and a wide range of functions. It is
different from the allroad quattro
suspension system used on previous
models. The new features are briefly
described below and later in more detail in
the Components Section of this program.
Computer Dampening Control (CDC)
Computer Dampening Control (CDC)
technology calculates the current driving
status. The wheel movements (unsprung
masses) and body movements (sprung
masses) are recorded.
Using one of four modes (a combination of
the Adaptive Air Suspension Program and
the Dampening Map), different dampening
characteristics are achieved. In the
process, each shock absorber is
independently controlled. As a result,
maximum comfort and driving safety is
achieved.
Enhanced Sensor System
Three Acceleration Sensors are used to
record the body movement.
4
Encased Pneumatic Struts
Pneumatic struts are housed in an
aluminum cylinder, which results in an
improvement in the response
characteristic.
Operation
Integration in the Multi-Media Interface
(MMI) means that operation is user-
friendly, logical and easy to learn.
Residual Pressure Retaining Valves
Each strut has a residual pressure
retaining valve at the air connection.
This ensures that a minimum pressure
of approximately 44 to 73 psi (300 to 500
kPa) is maintained in the pneumatic
struts and almost eliminates the
possibility of damage during storage
and assembly.
5

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin