Self Study Program 292 – Adaptive air suspension in the Audi A8

VAG SSP 292. The development of the running gear is subject to conflicting objectives. For now, besides “classic” aims such as function, driving safety, strength and durability, requirements such as weight reduction, driving comfort and acoustics are increasingly gaining in importance.

At first glance, many requirements appear to be in mutual opposition. A car designed to be very comfortable will lose out in terms of driving safety when driven at the limit.

On the other hand, a car with very sporty tuning will achieve considerably higher cornering speeds, and will reach its limit much later. However, this sporty tuning necessarily entails limitations when it comes to comfort.

In the Audi A8 MY 2003, a newly developed, fully bearing air suspension system is used. In conjunction with the CDC status-dependent electronic damping control, this ensures that the main – and partly conflicting – requirements are satisfied in an optimum manner within the limits of the laws of physics.

CONTENTS

• Introduction
  • Basics
  • New technology
• Operation and display
  • Vehicle levels
  • Operation and display system
• System components
  • 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
  • Control concept for standard running gear
  • Control concept for sporty running gear
  • Control concept for special operating conditions
• Interfaces
  • System overview of components with bus link (CAN, MOST)
  • System overview of components without bus link
  • CAN information exchange
  • Function diagram
  • Other interfaces
• Service
  • Control unit code
  • System initialisation
  • Final control diagnosis
  • Measured value blocks

The Self Study Programme contains information on design features and functions.

The Self Study Programme is not intended as a Workshop Manual.
Values given are only intended to help explain the subject matter and relate to the software version applicable when the SSP was compiled.

Use should always be made of the latest technical publications when performing maintenance and repair work.

Language: English
Format: PDF
Pages: 46

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