2011 Automobile Maintenance Advanced Course for the

Industrial Technical Instructors

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Instructor: Liao, Ching-shiang

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Air suspension function

• Vehicle level adjustment

The level adjustment enables both manual and speed-sensitive a~_t~rr:'atLc raising and lowering of the vehicle level.

• Vehicle level control

The vehicle level at the front and rear axle are controlled corresponding to the respective driving and load condition and keeps it g9J1SJ~nt._

• Adaptive damping

Adaptive damping system adapts the damping forces to the road surface quality (vertical acceleration sensor) and driving style (horizontal acceleration calculated from vehicle speed and steering angle) .

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advantages

• Greater driving safety and comfort:

-adapting the damping to road surface quality and driving style

-lower center of gravity -lower air resistance and therefore lower fuel consumption

-less lift at the front axle

3

advantages

• Individual adaptation: -increase in vehicle level for rough road or garage entrances

-provision for setting 2 damping characteristics for comfortable or sporty driving style

4

advantages

• Driving information: -display of increased vehicle level stage and sporty damping stage via function lamp

-warning of vehicle level being too low by the multifunction display

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Location of components 1

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Location of components 2

AW1 AfRmatic compre:s:sor unit B2414 Right front body acceleration N7211 :s3 Comfort and :sport :switch A1p13 Multifunction display s~n.sor S9/1 Stop lamp switch B7 AIRmatic pr~ssur~ s~nsor B2416 R igM rear body accelerat ion X1114 Data link conn~ctor B2213 Rear axle level sensor s~nsor Y3616 Level control valve unit B2218 Left front level sensor K40/7 Right front fuse and relay module Y51 Left front axle damping valve unit B2219 Right front lfavfal :jfan:jor kO AIRmatic compr~ssor r~/ay Y52 Right front axlfa damping VaNfa I B2413 Left front body acceleration N49 Steering angle sensor unit

sensor N51 AIRmatic with ADS control Y53 Left rear axle damping valve unit module Y54 Right rear axle damping valve

N?211s2 L~v~1 control switch unit

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Function of level control

• Shut-off position function

• Normal function (engine running)

• Wake-up function (operating period approx. 1 minute)

• Function in vehicle condition "ignition on"

• After-run function (operating period approx. 1 minute)

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Level control valve unit

• 1 left front spring strut

• 2 right front

• 3 left rear

• 4 right rear

• 5 central reservoir

• P air compressor

• 87 pressure sensor

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Level control valve unit function

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ADS control module,suspension function

Vertical body Vehicle speed Steering angle Stop lamp Switc hove r b etV\Je e n Pressure Vehicle Level desired by accelerat ion switch co mfo rtlsp 0 rt signal level driver

... r ... .. ... .. .... .. ... ... .... .. ... .. .... r Receiving sensor signals, calibrating sensors and monitoring sensors .. ..

Adaptive damping system ADS II Suspension, level control and level adjustment 1. Detecting driving conditions (vertical body acceleration, 1. Detecting vehicle level and driver's preferences (switch I

longitudinal and lateral acceleration, brake application, position) switching between comfort and sport settings) 2. Calculatinq desired level

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Converting damping forces and desired level into valve and compressor control times .. .. Monitoring control module, operating conditions and control signals

Fault identification cutout type of fault diaqnosis entry

* * I Output stages I ... ... ... .. ... ..

Damper valves AIRmatic compressor unit Level control valve unit

Control module function

• Signal conditioning

• Function logic section

• Safety circuit

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Control module signal & function

• Calculation of vertical body accelerations -body acceleration sensors signal

• Calculation of vehicle speed -wheel speed signal -speed status signal

• Calculation of longitudinal and lateral acceleration -wheel speed signal -steering angle sensor signal

• Calculation of compressor actuation -outside air temperature signal -reservoir pressure signal -vehicle speed signal -vehicle level signal -operating time

15

Control module signal & function

• Calculation of valve actuation -front axle level signal -rear axle level signal

• Calculation of central reservoir charge valve actuation -front axle level signal -rear axle level signal -pressure signal

• Calculation of vehicle level -level sensors signal

• Information signals (operation) -stop lamp switch signal -comfort and sport switch signal -level control switch signal -door contact switch signal

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Damping valve function

y1 solenoid valve 1

y2 solenoid valve 2

a by pass valve, hard compression stage

b by pass valve, soft tension stage

c by pass valve, hard tension stage

d by pass valve, soft compression stage

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Control states of damping force

Damping Damping valve Valve control force stage Tension Compres Solenoid Solenoid

stage • valve(y1 ) valve(y2) slon stage

1 comfort comfort open open

2 soft hard closed open

3 hard soft open closed

4 hard hard closed closed19 - --

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Spring strut

rotective piston up sea I rod

tension stop spr I ng

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pIston rod

pIston rod guide

gas pressure chamber

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Active body control system

• The ABC system is a full suspension system. The system is capable of applying active forces to each wheel with the aid of four hydraulic suspension struts.

• The active ABC suspension is different from other systems in that it uses dynamically-adjustable hydraulic cylinders at the wheels and does not use stabilizer as used in conventional suspensions.

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Advantages of ABC

• As a result of the active body damping, it is possible to use very soft, passive shock absorbers which improve vibration and tire comfort considerably.

• Although without stabilizer bars, the ABC system compensates the typical body roll when cornering and the pitch motion when accelerating or braking.

• Vibrations and chocks which are caused by road bumps can be damped more effectively.

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ABC pressure supply function

1 Radial piston pump 2 Oil reselVoir 2a Oil cleaner 9 Oil cooler 14 Front axle pressure reselVoir 40 Front axle spring strut 52 Pressure supply valve unit 52a Pulsation damper B4I5 ABC pressure sensor B4CV1 ABC oil temperature sensor 9 Y3fv'1 ABC front axle valve unit Y81Y1 Active Body Control (ABC) suction

restrictor valve

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ABC spring strut function

• A normal state

• B pressureless state A

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• y oil chamber •

• r spring

• v shock absorber

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