Pneumatic suspension system Part 2 4-level air ... - Volkspage

More documents

Recommendations

Info

Control strategies There are two control units currently in use, depending on the country. The control strategies described below relate to the control unit 4Z7 907 553A. The differences in control units with part numbers 4Z7 907 553B are described subsequently. See also page 34, “Self-levelling control unit J197”. Control strategies 4Z7 907 553A Automatic lowering As mentioned previously, the driver can select the appropriate level by actuating the “raise” or “lower” buttons. If the vehicle is at high level 2, it will lower automatically to high level 1 at a speed of > 35 km/h. The system will respond to a request to shift to high level 2 only up to a speed of < 30 km/h. At a speed of > 80 km/h in high level 1, the system will automatically lower the vehicle to normal level.. The system will respond to a (manual) request to shift to high level 1 only up to a speed of < 75 km/h. During driving operation, no automatic raising to high level 1 or 2 is performed. It must be selected manually by the driver. The parking level is an exception. In this mode the vehicle automatically rises to high level 1 once it has been parked and locked (see parking level control). The following preconditions relating to driving speed apply for high level 1 and high level 2. Lowering processes 10 HL2 Automatic lowering HL1 after 30 seconds NL LL 243_026 0 35 80 120 Speed km/h Raising processes HL2 after 30 seconds HL1 after 120 seconds NL Raising to parking level LL Immediate raising 0 5 35 70 120 Speed km/h
Motorway mode If the vehicle travels for longer than 30 seconds at over 120 km/h (vehicle is already at normal level), it will automatically be lowered to low level. This reduces air resistance (saves fuel) and lowers the vehicle’s centre of gravity (improved driving dynamics). The vehicle rises automatically to normal level at the following speeds and time thresholds: Vehicle speed Time 120 seconds 30 seconds
Page 1 and 2: 243 Service. Pneumatic suspension s
Page 3 and 4: Contents Page System description .
Page 5 and 6: The 4-level air suspension system i
Page 7 and 8: Operation and display Operation The
Page 9: Other button functions Automatic sw
Page 13 and 14: ESP safety switching For technical
Page 15 and 16: Rear suspension strut The bayonet c
Page 17 and 18: Air supply The compressor The const
Page 19 and 20: Pressure accumulator The pressure a
Page 21 and 22: Solenoid valves The 4-level air sus
Page 23 and 24: Vehicle level senders G76, G77, G78
Page 25 and 26: Construction/design The angle senso
Page 27 and 28: Level sensors, summary The advantag
Page 29 and 30: Interfaces CAN information exchange
Page 31 and 32: The trailer operation signal … ..
Page 33 and 34: Key to function diagram E281 Self-l
Page 35 and 36: Modes Height mode/driving mode Reac
Page 37 and 38: Trailer operation The correct posit
Page 39 and 40: Basic system setting The basic syst
Page 41 and 42: General overview Control unit 4Z7 9
Page 44: All rights reserved, including the

Pneumatic suspension system Part 2 4-level air ... - Volkspage

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?