SSP213 New Technology ‘99.pdf

8/14/2019 SSP213 New Technology 99.pdf

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Service.

For internal use only

New Technology 99

Design and Function

Self-Study Programme 213

2 1 3


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Modern like never before ...:

the aluminium body,

quattro technology,

an extensive range of high-tech engines,

an excellent convenience and safety package


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Running gear . . . . . . . . . . . . . . . . . . . . . . . . 22

Air conditioning system . . . . . . . . . . . . . . . 30

Electrics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Con

Vehicle safety . . . . . . . . . . . . . . . . . . . . . . . . . 4

Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Page

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70


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N196

N201

N277

G179

N153

N199

V94

J218 / K75

N95

F221F220

WF222

F223

F140

G177

F

Vehicle safety

System overview


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G178

N198 N197

N202

N27

G180

N154

N200

N131E224

G128

K145

J17 G6

AIRBAGOFF

AUS EIN

AIRBAG

F141

F146F158


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Vehicle safety

Head airbag

Another special feature of tairbag is the protection proimpact with the A pillar. Spair pockets undertake this t

Once activated, the heainated for longer in orderoccupants protection in theover after the collision.

The new SIDEGUARD head airbag systemimproves the high standard of safety alreadyafforded.

The head airbag module extends from theD pillar to the A pillar on the driver's and frontpassenger's sides. It inates in one unit alongthe roof frame trim.

A curtain type airbag located above the


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Lateral accelerationsensor G179/G180

The sensors, which have been moved out tothe B pillar in the A8 99, are connected toairbag control unit J234.

To activate the relevant output stages ofthe side airbag, the plausibility of the sensorsignal has to be veried.

1 2 3 4 5 6 1

3Ah

2Ch

1Dh

16h

0Bh

Data is repeated every 524 s

Word width 64 s

Bit width 8 s

Sensor defective

Sensor OK

Crash comm.

Negative plausibility

Crash/Fire


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Compared to the V8 4-valvfeatures and/or modicatio

Modications

to crankcase and crank to oil circuit to cooling circuit

New features

V8 5V engines

Engine

SSP213_0

Introduction

AUDI has been producing state-of-the-arteight-cylinder engines since 1988. Enginedisplacement has increased from 3.6 litres to4.2 litres.

The V8 engine together with AluminiumSpace Frame technology was the technicalbasis for Audi's breakthrough into the luxuryclass of car manufacturing.


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E i


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Engine

All the new features improemission, fuel efciency aalso increasing power outp

Power output of the 4 2 l h

The ve-valve cylinder head with valveactivation by a roller valve lever is employedin the new engine series.

Valve gear of this type produces a great deal

5-valve technology


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G b


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180-

For design reasons, the speed of the planetcarrier of the Ravigneaux planetary gear train

has been used in the past to control shiftoperations.

The inductive sender G182 serves thispurpose. The speed of the planet carrier wasconverted to a turbine speed in the gearbox

Gearbox

Gearbox input speed sender G182 Housing,clutch B

Gearboxinput shaft(turbine shaft)

Housing,clutch A

G182(Hall sensor) previously:

G182(inductive sensor)

Plan

C B A

E

D

Measuring the turbine spaccess to the housing of

responsible for power tra

The housing of clutch A turbine shaft and is locathousing of clutch B.


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SSP213_0

Housing, clutch BMagnetic ring

G182

Gearboxinput speed sender

The advantages of precise turbine speedacquisition are as follows:

Control and adaption during gearshifts to

1st gear and reverse. This reduces theengagement jolt when a drive gear isselected from P or N and when a rollinggearshift into 1st gear is executed.

Housclutch

Improvement in shift qthrough precise controgearshifts.

Improvement in self-dithrough early detectionclutch/brake.

Gearbox


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Gearbox

Signal characteristic of G182

Test conditions:

Engine idling speedGate selector lever in position P

2 V/Div. 10 ms/Div.

T

Test conditions:

Ignition "on"orEngine at idling speed

Drive position selectedBrake operated (turbine not running)

2 V/Div. 10 ms/Div.

Also refer to theManual

DOS connection

Red test probe Pin 44 SignalBlack test probe earth


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Auxiliary ATF cooler

To account for the increased torque availableto the six- and eight-cylinder engines, thefollowing engine variants have an additionalATF cooler.

Two variants are used.

System Engine capacity Fitting location

Auxiliary ATFcooler withseparate thermostaticvalve

A6 V8 3.7 lA8 V8 3.7 lA8 V6 TDI

260 bhp260 bhp170 bhp

right, behind bumperleft, behind bumperleft, behind bumper

Auxiliary ATFcooler withintegrated thermostatic

valve

S4A6 BiturboA6 V6 TDI

250 bhp250 bhp170 bhp

left, behind charge air coolerleft, behind charge air coolerright, behind bumper

Auxiliary ATF cooler with separatethermostatic valve

Auxiliary A

Gearbox


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Gearbox

The auxiliary ATF cooler iseries with the main ATF c

In this way the heat whichresult of the high power traat an acceptable level.

The auxiliary ATF cooler is designed as anoil-air heat exchanger and connecteddownstream of the main ATF cooler(oil-coolant heat exchanger) via athermostatic valve.

The thermostatic valve closes the return lineto the gearbox at approx. 80 oC and opens thesupply line of the auxiliary ATF cooler.

ATF temperature < 80o

C

ATF temperature > 80 oC


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Auxiliary ATF cooler with integratedthermostatic valve (example: Audi A6 Biturbo/S4)

When parts of the auxiliary cooler arereplaced or ATF lines are disconnected,the auxiliary cooler goes to idling

mode.

The auxiliary cooler cannot vent itselfat low ATF temperatures, since thethermostatic valve does not open untilthe AFT temperature reaches approx.

Thermostatic valve

Running gear


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Running gear

AxleFront and rear swing arms


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The swing arms used in the Audi A8 aremanufactured from an Al-Si-Mg alloy bymeans of a mould casting process. They arethen subjected to heat treatment.

The swing arms for the Audi A6 - V8 andAudi S4 are forged from an AlMgSi alloy andthen undergo heat treatment.

On account of the material pairing ofl d l S

Swing arm

SSP213

Forging, Audi A6 Casting, Audi A8

Running gear


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Wheel bearing

Running gear

Threaded connection

Wheel bearing housing

Wheel hub

Threaded connection

Wheel bearing, threaded solution


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The new central spring with lemanufactured from stainless sbrake pads to be changed withundo threaded connections or tools.

To avoid contact corrosion betaluminium and steel componecobalt coating is applied to thcaliper carrier and the outer o

The following brake disc dimein the vehicles listed below:

The high-performance HP2 brake system,which has been in use since 1992, wasoptimised for brake response weight and noise emission.

The new HP brake caliper is partly made ofaluminium. This makes it possible to reduceweight by 2.2 kg at the front axle despite thefact that the brake discs are larger.

h d f h l

HP2 brake caliper (Lukas)Central spring withleaf spring

SSP213_0

Running gear


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g g

4-piston brake caliper (Brembo)

The brake pad guides have stainless steelinlays.

Weight saving and easy tadvantages.

The brake discs measure 3keeping with engine perfo

An all-aluminium 4-piston brake caliper isused in the Audi S8.

The powder-coated brake caliper is attachedto the swing arm radially. This fasteningmethod has a positive effect on the brakecaliper's vibration characteristics and helpsreduce noise.

Central s

Radial screw connection atswing arm


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Running gear


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g g

A

O

Two grooves in the damper tubeserve as a bypass and reducethe resistance of the damper piston.

Approx. 40 mm in length, the grooves arelocated within the operating range of thedamper piston when the vehicle is in anunladen* state or if it is laden with one tothree persons.

Gas-lled twin-sleeveshock absorber

In combination with a new suspension setup,shock absorbers, which have a dampingcharacteristic dependent on engine load andtravel, are used in the Audi A8 on the frontand rear axles.

The gas-lled shock absorbers respond tovehicle vibration.

Bypassgrooves


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The light-alloy hollow-spoke which will be used in an Audi

in the Audi A8 with effect fromreduces wheel weight in compconventional cast aluminium wapprox. 2 kg per wheel.

The wheel comprises two part

Hollow-spoke wheel

SSP213_041

Reducing the weight of the wheels offersadvantages in three respects:

Reduces kerb weight(static)

Reduces unsprung masses Reduces rotating masses

Friction weld

Cavity

Rim width

Air conditioning system


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Operating and display unitE87

The information on amsupplied by sender G1directly to the dash panis evaluated and made data bus.The information on amsupplied by sender G8directly to the operatinwhere it is evaluated anon the data bus.Operating and display lower ambient temperacase.

Air recirculation mode it h d f d

Technical status of operating and display unit major product upgrade

Vehicles with a modied dash panel mid-section will be equipped with a new airconditioner operating and display unit witheffect from model year A8 GP 1999.The automatic air conditioner control unit hasbeen retained.

What features are new, both technically andvisually?

Operator keys have been repositioned.R i d h t b tt h b

Windscreen heater button

Rear window heater


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The key is coded by reading otransponder code. The immobunit integrated in the dash pansupplies this information to opdisplay unit E87 along the CA

Key code

When the ignition is turned on, operating anddisplay unit E87 initially adopts the setting,temperature, air distribution and fresh airblower speed which were valid when theignition was last turned off with this key.

J 220 J 218 J 217 J 104 E 87

In the Audi A8, the operating and displayunit is connected to the Drive data bus.

Depending on the vehicle equipmentspecication, various control units belongto the drive data bus.

CAN LCAN HCAN screen

Up to 4 keys can be

Drive data bus in max. commconguration:

J104 ABS control unit witJ217 Automatic gearbox cJ218 Combination process

i

Information exchange between the automaticair conditioning system and other systemsnow takes place along the CAN bus



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Example: Information networking E87

The combination processor in dash panelinsert J218 supplies the followinginformation:

Coolant temperature t Vehicle road speed v

Ambient temperature A Stationary period t h

Engine control unit J220 supplies thefollowing information:

Engine speed n Coolant temperature t 1

Air conditioner compressor OFF/ON K Intake air temperature L Air conditioner compressor Off K a

The operating and display unit, therefore, isno longer connected directly to certain

J 220 J 218

E87

t ht v t 1A LnCAN-BUS

K

The operating and display following messages to the system along the Drive dat

A/C ready (speed incre Driver input, auxiliary

Heated rear window Heated windscreen Compressor state OFF/ No heat output required Ambient temperature (s Air conditioner pressur Compressor load Fresh air blower voltag


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Can be switched on by rem

Range: up to 600 m in the

There is no additional heatwhen the fuel tank is empEmpty is roughly equivaledisplay range.

What's new?

The switch-on time can be preset on thevehicle timer. A separate presetting timeris no longer required.The switch-on time can be programmedwith function selector switch II in thecentral console E272, which is also usedfor manual switch-on.

E87

MENUE

INFO

RETURN

OI

t o M

CAN

3

2

1

45

6

0

710

30

50

70 100

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220

260

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Function se(rotary/push

Heater contr

Radio-wave remotecontrol receiver foradditional heating R64

Fresh air blower On

Auxiliary heating/ventilation

Switch

Aerial

Auxiliary heating

Aux. ventilation



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Temperature control

Automatically controlled air recirculationmode

In automatic air recirculation mode, a change-over from fresh air mode to air recirculationmode takes place automatically when thesensor detects noxious smells.

In automatic air recirculation mode, thechange-over takes place as soon as the airquality sensor detects pollutants, i.e. beforenoxious smells actually develop.

Air qualisensor G

Combi. lterFresh airintake

SO 2

NO x

CO

C H6 6

C H6 14

H S2CS 2

Airborne pollutants

The system components

Air quality sensor G238An electronic component located in the


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The operating principle of the automaticchange-over system

Operating and display unit with acontrolled air recirculation mode

Manual functiooff button

The operating principle

A gas sensor detects pollutants in theambient air.

When a high pollutant concentration ismeasured, a signal is transmitted tooperating and display unit E87, whichthen switches from fresh air mode to airrecirculation mode.

If the pollutant concentration drops below agiven threshold, fresh air is again supplied tothe vehicle interior.

The period between the detection ofpollutants and the closing of the fresh airsupply is bridged by the activated charcoal inthe combination lter.

The operating and display unit decides

whether to carry out a change-overautomatically depending on the level of airpollution, the ambient temperature, driverinput and whether the compressor is on oroff.

The automatic air recirculationfunction can be switched on or offmanually.

Ambienttemperature

Air pol

> +2 oC Lri

> +2 oC L

+2 oC ... 5oC

Higri

< 5 oC Higri

ECON modecompressor off

Defrost mode

Warm-up phase of sensorapprox. 30 sec.

Example:



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M

The evaluation electronics in the sensor

The evaluation electronics integrated in theultrasonic sensor module react to changes insensor conductivity.

It achieves a high degree of sensitivity.

The system is self-adaptive, i.e. self-learning.

The electronics determine the averagepollutant concentration in the ambient airand send a request for air recirculation to theair conditioner control unit by means of asquare-wave signal.

The control unit now closes the airrecirculation ap and fresh air ap dependingon the ambient temperature, driver input,whether the compressor is on or off and theextent of air pollution at peak pollution levels.

This ensures that the system is notcontinuously switched to air recirculation

Operating anddisplay unit

Air quality sensor

Air quality sensor G238

In principle, the sensor operates in much thesame way as a lambda probe.

The measuring element is a mixed oxidesensor which incorporates semiconductortechnology (tin oxide - SnO 2).Sensitivity to noxious gases is increased bycatalytic additives consisting of platinum andpalladium.

The sensor has an operating temperatureof approx. 350 o C. Its power consumption of0.5 watts is very low.


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The combination lter

The combination lter is a dust and pollenlter made of a non-woven fabric with anadditional lter inlay of activated charcoalgranulate.

The non-woven fabric lters out dust andpollen.

The non-woven fabric can also lter outgaseous pollutants such as ozone,benzene, nitrogen dioxide and otherpollutants in the air owing through thelter.

Function

To absorb the gaseous impurities in the airowing through the lter until the fresh airap is closed and the air conditioning systemhas gone into air recirculation mode.

Air then no longer ows through the lter.Air recirculation mode inevitably extends thelter's service life.

The activated charcoal layer reacts differentlyto different pollutants:

Certain pollutants are bound permanentlyin the lter.

Others are converted to harmlesscompounds in much the same way as in acatalytic converter.

The activated charcoal has the sameeffect on the remaining pollutants as a

Service

The combination lter must bethe prescribed service interval

Since the activated charcoal lapermanently binds a fraction oparticles, it is advisable to repearlier in certain conditions of

Activatedcharcoal granulate

N



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Function diagram

The function diagram represents a simplied currentow diagram and shows how all component parts of theair conditioning system interact with one another.

Components

D Ignition switch, terminal 15E87 Air conditioner operating and display

unitF129 Air conditioner pressure switch

F183 Vent switch, middle leftF184 Vent switch, middle rightG89 Fresh air intake duct, temperature sensorG92 Temperature ap positioning motor

potentiometerG107 Sunlight penetration photo sensorG111 Air conditioner compressor speed senderG113 Air ow ap positioning motor

potentiometerG135 Defrost ap positioning motor

potentiometerG136 Potentiometer in left-hand central vent

positioning motorG137 Potentiometer in right-hand central vent

positioning motorG138 Potentiometer in central vent positioning

motor

G139 Potentiometer in left-hand footwell appositioning motorG140 Potentiometer in right-hand footwell ap

positioning motorG141 Potentiometer in rear footwell vent

positioning motor

V2 Fresh air blowerV50 Coolant circulatioV68 Temperature ap pV71 Air ow ap posit

V102 Centre vents positiV107 Defrost ap positiV108 Left footwell ap V109 Right footwell apV110 Centre left vent poV111 Centre right vent pV112 Rear footwell ventV113 Air recirculation Z1 Heated rear windo

Auxiliary signals and connec

1 From dash panel iinstruments (term

2 From steering colucontact

3 To relay for fan sp

4 Air conditioner co

5 Speed increase sig

6 Windscreen heater

Code codes

= Input signal

= Output signal

= Positive

= Earth


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31X1530

2 4 6 8

S

31

t t

C A N

- B U S L

1

3 5 7 9

t

C A N

- B U S H

J 218

G107

1

F183 F184

S

M

V50 N175 N176

S S

J 44 N25

X

G150 G151 G89

G142

M

V71

G113

M

V68

G92

31

Z1

D+15

12

Electrics


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Radio-controlled clock The time of day and date are displayedon the two-line clock display. The followingsegments are also integrated in the clockdisplay:

You can nd further informationregarding distance and cruise controlas well as tyre pressure monitoring ina special SSP.

Dash panel insert

The basic information which is displayed bythe dash panel insert has been adoptedunchanged.

The new eight-colour dot matrix display islocated in the middle.

The messages issued by the driverinformation system (DIS) cover therepresentation of graphic information of additional external

systems, e.g. navigation, radio, telephone Ambient temperature On-board computer Shift indicator Auto-Check System (in the background)

A new feature is: Distance and cruise control display Tyre pressure monitoring

(equipment-dependent) Menu guidance

ANFM

P R N

6

7

+25.5

0 5.2


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Options Computer Clock Tyre pressure*

Auxiliary heating*

For instructions on how to operatethe various menus as well as thefunctions, please refer to the vehicle'sOwner's Manual.

MENU

RETURN

6

7

Menu guidance

In conjunction with the major productupgrade of the Audi A8, menu guidance hasbeen introduced for the dash panel insert.The settings are made using function selectorswitch II E272 in the central console. Optionsmenus are represented on the display of thedriver information system.

The start menu has the following displaymodes: Menu from Interrogate Options Help

The following functions are assigned to thestart menu display modes:

Menu from On-board computer Auto-Check Control/radio or telephone

dataAmbient temperature

Display

Menu fromInterrogateOptions

Help


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Front passenger's door con

(closed - earth) if door ope Door contact switch rear le

(closed - earth) if door ope Door contact switch rear ri

(closed - earth) if door ope Luggage compartment swi

earth) if luggage compartm Driver's side belt switch (c

not seat belt fastened and Input for external buzzer a

Hz, earth = active) Washer uid (switches to e

washer uid level too low Onboard computer buttons

right) Glow plug relay

(switches to earth, normal Hydraulic pressure (switch

pressure drops below mini Stop light defective Tail light defective/driving Signals from radio, telepho

navigation computer Bonnet switch

External radio digital clock Oil level and oil temperatu Pressure switch for oil lte

degree of soiling of oil lt Interface to function select Radio input, additional hea Transponder coil for immo

Output signal

Speedometer output - signaas inversion of input signa

Dimmer output digital (58Di di i l (3W (58d)

Input signals

Voltage supply Terminal 30 Terminal 31 Sensor earth

Analog signals Fuel tank sender Coolant temperature sender Ambient temperature External phototransistor

Digital signals Terminal 15 Distance signal (Reed sender) Terminal TD/W Diagnosis interface (K-wire) Oil pressure switch 1.2 bar (switches to

earth when oil pressure > 1.2 bar) Brake pad (shorting jumper to earth/

jumper is disconnected in case of fault) Brake uid switch - switches to earth whenbrake uid level drops below min.

ABS signal Coolant level sender (when coolant level

d b l i )

If terminal 30 is missing from thedash panel insert, then SICH orFUSE is indicated continuously onthe mileage/kilometer counterdisplay.


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Electrics


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CAN Display

The signal direction for Dafrom the radio to the Auto CThe Enable line is operated

As the lower level control uinsert outputs a data requestelephone along the Enabl

If the bus display is off loabus or bus partner off) andpartner (radio, telephone) wmessage, the dominant par

The following control units are networked onCAN Display:

Radio (symphony only)

Control unit for telephone operatingelectronics J412

Control unit for navigation with CD driveJ401 as well as navigation operatingelectronics control unit J402 for vehicleswith Navigation 1,

Radio

J412

J402(screen navigation only)

J218

J402(Navigation1 only)


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The ag byte, dataset and check byte aretransmitted along the Data and Clock wires.

The data message comprises a total of 18bytes which are transferred from the radio ortelephone to the dash panel insert anddisplayed as a message.

1 The rst byte with differentbits contains the identier for radio ortelephone.

2 - 17 bytes contain the dataset ormessage

18 byte is the check byte which containsthe checksum of the message.

Flag byte Check byteDataset

Enable

Data

Clock

Electrics


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The following information

Messages from the dasthe navigation system pulse length coding (renavigation no longer orequest, radio request,

The navigation interfaceInterfaces the dash panel insert to the parallel

components radio/telephone (MFL Interface).Both interfaces are implemented as a wirebus (Clock, Data, Enable). However, messagebuildup, protocols and transfer rates of bussubscribers radio/telephone and navigationsystem are different The navigation interface

R T

+

-

J 412 J 453

J 402

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TR

S

CD

1

1

PLAY

J 218

1-wire CAN

Tel. bus

Tel. (MFL) Multi-functionsteering wheel interface

Sy

Navigation

3-wire high-s

Remote

3-wire low-spe

Enable (bidirectional) Data, clock

Navigation

(example: Navigation1)


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CAN Convenience

In CAN Convenience, the following controlunits are internetworked:

Combination processor in dash panelinsert J218

Control unit for tyre pressure monitoringJ502

Control unit for parking aid J446

J218

J502

J364

Electrics


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Self-diagnosis of dash panel insert

New contents in the followingfunctions:

02 - Interrogate fault memory08 - Read measured value block10 - Adaptation

Interrogate fault memory

With the introduction of CAN systems, theinterrogation/fault numbers which aremonitored and stored have beenincremented.

In the fault memory of the Audi A8, forexample, this results in the followingadditional fault locations which can bedisplayed:

Data line from Navigation - implausible signalNavigation operating electronicscontrol unit - no communicationControl unit for Telematics - no communicationTelephone - no communicationRadio control unit - no communicationEngine control unit - no communicationGearbox control unit - no communicationABS control unit - no communicationTyre pressure monitoring - no communicationParking aid - no communicationCAN Display - defective

A static fault is sexists for at leas


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Electrics


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Measured value block 130

Read measured value block 130 Display

Parking aid - display eld for CAN 1 - denotes parking aid control

CAN bus Empty display eld denotes park

is not connected to CAN bus

Additional heating - display eld for CAN interface 1 - denotes additional heating control unit is connected to CA Empty display eld denotes additional heating control unit is

connected to CAN bus

Tyre pressure - display eld for CAN interface 1 - denotes tyre pressure control unit is connected to CAN bus Display eld denotes tyre pressure control unit is not connected to CAN bus

Measured value block 140

Read measured value block 140 Display

Telematics - display eld for CAN

1 - denotes Telematics control uCAN bus Empty display eld denotes Tel

is not connected to CAN bus

Navigation - display eld for CAN interface


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Electrics


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Sound system

symphony radio

FM range:

The FM reception signals supplied to the radio by 4 aand FM via the change-ov

The radio makes a frequand requests the change-ovintermediate frequency linappropriate aerial and the hsignal.

AM range:

The reception signal in thepermanently supplied via tamplier.

The symphony radio has the followingoutstanding features:

Integrated Single-CD Player Improved ease of operation, e.g. separate

sound control in the high, mid and lowfrequency bands

System is CAN bus compatible Use of the change-over box

The geometry of the rear window results indifferent magnetic eld strengths which canimpair the reception (Rx) level in certainsituations.

To optimise reception, aerials for the FMrange as well as an aerial for the AM rangeare integrated in the rear window in theAudi A8 4.

TRACK SEEK

CD CDC

AM

FM

1DOLBYSY

2

1 2

TAPEPLAY SDE

BASS MIDDLE TREBLE BALANCE

1 2 3 4

EJECT Audi symphony

EJECT


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Flexible Service IntervalDisplay

The Service Interval Display informs the driverwhen a service is necessary.

The Fixed Interval Display, i.e. with limitationof distance or time to next service to15,000 km or 1 year respectively, will bereplaced gradually by a Flexible ServiceInterval Display.

Compared to rigid maintenancFlexible Service Interval Dispuse to be made of the engine omance reserves. A new sensoroil level and oil temperature hdeveloped for this purpose.

Warning display1. Priority oil level 2. Priority oil level

distance

You can nd further ithe Flexible Service InSSP 207.

5

Oil level sensor

Bonnet contact

Engine con-trol unit

Mileage/kilo-

meter counter

Dash panelinsert

How do you identify (Fixed or Flexible) is The adaptation channand 47, can only be dconnection with the F

Oil levelhigh

Oil level


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The wheel electronics

together with the valve form a compact unitwhich is bolted to the rim.

An intelligent sensor developed speciallyfor this application is located here.

This sensor comprises a pressure sensor, atemperature sensor and an integrated circuitfor complete measured-value acquisition and

signal conditioning.This sensor activates the HF transmitterstage. The sensor and transmitter stage arepowered by a lithium battery.

The receiver aerial

receives the data message supplied by thewheel sensor and transfers this to the controlunit for tyre pressure monitoring for furtherprocessing.

The function selector switch

Electrics


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Acoustic parking aid, frontand rear

SSP213_050

Intermittent warning beepsvehicles comes within apptimetres of an obstacle. Thmoves towards the obstacl

interval between warning bWhen the vehicle come

20 cm of an obstacle, the ibecome a continuous tone.direction of the warning be

The Acoustic Parking System (APS) is an ultra-sound based system that helps the driver tomanoeuvre the vehicle. It alerts the driver bymeans of audible signals when the vehicle is

approaching an obstacle.

Function

After turning on the ignition, the micro-

Cont. tone

Intermittentwarning beeps


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Ultrasound converter

The ultrasound converters are housed in thefront and rear bumper covers. They act asactuators and sensors, i.e. they transmit andreceive signals.

Control unit for parking aid J446 gives thecommand to transmit or receive ultrasonicwaves.

The converters receive an echo reected bythe obstacle. In the converters, evaluationelectronics calculate the distance betweenthe vehicle and an obstacle from the echopropagation time, i.e. the time betweentransmission and reception of the signal tothe individual converters.

The evaluation electronics in the

converters generate digital signals from theecho signals and relay them to the controlunit.

In the control unit, the time between thecommand to transmit ultrasonic waves andreceive digital signals from the converter isevaluated by timers.

The distance between the vehicle and theobstacle is calculated from the different timescomputed by the control unit using thetriangulation method.

Triangulation

From the various distances it can beconcluded that the object is located betweenthe 2nd and 3rd converters. Height h can bedetermined using Pythagoras theorem. Theresulting distance is 44 cm.

Sample calculation


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X1530


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S

31

J 446

G255 H15 G254G253G252G206G205G204G203

F4

S

30+

15+

D

F125

Electrics


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Electric

Windscreen heater

Function

The windscreen is not heated like the rearwindow, i.e. by means of individual wires. It isheated by a metal foil sandwiched betweenthe windows.

Windscreen schematic diagram of layeredstructure

Decorative printFully printed area

Uncoatedborder region

SSP213_006

Communication between the air conditioner/ Climatronic operating and display unit E87and the control unit for heated windscreenJ505 is bidirectional.

Air conditioner/Climatronic operating anddisplay unit E87 issues a heating request tocontrol unit J505.


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Signal shape of heating request issued by air

conditioner/Climatronic operating and displayunit E87

The air conditioner/Climatronic operating anddisplay unit sends a Low signal to the controlunit for heated windscreen J505 as a heatingrequest.

Signal shape of windscreen ready for heatingas well as heating by the control unit forheated windscreen J505

The control unit for heated windscreen J505signals when the windscreen heating is ready

in the form of a Vbat signal.

Windscreen heating On is implementedby a 1/2 Vbat signal.

tAir conditioner/Cli-matronic operatingand display unit E87

Vbat

1/2

Vbat

Electrics


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Defrost settingon air conditioner/Climatro

display unit: Engine running Ambient temperature < Heating period depende

temperature Limitation of fresh air b

7 volts In the operating state, t

Defrost button ashes symbol is displayed in speed.

The windscreen heater canthe switch position ECONtioner/Climatronic operatin

The following ambient conditions are

required to operate the windscreen heater:

Switch-on functions/conditions

Automatic setting on air conditioner/Clima-tronic operating and display unit:

Engine running Ambient temperature < +5 o C Air conditioning system in the Heating

mode Vent temperature < +35 o C Heating period dependent on ambient

temperatureat 0 oC ~ 2 min. and 20 o C ~ 4 min.

Limitation of fresh air blower voltage to4 volts

Operating state is not indicated Switch off after exceeding one of the

values < +5 o C and < +35 o C or max. 4 min.

If the windscreen is damaged byexternal inuences (e.g. cracked bystone chips), the windscreen heatermust be shut down immediately.To avoid causing the air conditioningsystem to malfunction, the connec-tion to the windscreen heater control


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Electrics


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The control unit has self-diand can be adapted specithrough the diagnosis inter

A faulty headlight rangindicated by an indication insert

Control is vehicle-specic. The mode of opera-tion of the headlight range control adjustersis adapted to the vehicles operating state.

A short reaction time is required indynamic driving situations, such as brakingand accelerating At a constant road speed

Comparison of static and dynamic headlight

range control

Time

S p e e

d

Acceleration

Area of reduced eld of vision

Static control

Time

Brakes

H e a d

l i g h t r a n g e

Area of increaDynamic control


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Gas discharge headlight system

Both the dipped beam and main beam areproduced by only one gas discharge head-light.

When the dipped/main beam switch isoperated, an actuator brings the gasdischarge headlight in the reector into twodifferent positions which dene the emittedlight cone for the main or dipped beam head-light.

The additional halotted with an H7 lamrange illumination aasher when the ligon.

Parking light 12 V/6 W

Main beam headlight

Dipped beamheadlight

Special tools

Service


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Pressure piece

for crankshaft sealing ring

Order No.T40007

Tensioning roller key

Order No.T40009

Camshaft retainer

Order No.T40005

R l/ bl d i VAS 5161 f


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2

3

4

5

6

7

3

4

5

6

8

Removal/assembly device VAS 5161 forvalve repair(all VW/Audi engines)

VAS 5161/ 1 1 CaseVAS 5161/ 2 1 Thrust fork with lever for mounting cartridge

VAS 5161/ 3 1 DriftVAS 5161/ 4 2 Interlocking fork M6/M8VAS 5161/ 5 2 Interlocking fork M6/M8 with threaded boltVAS 5161/ 6 1 GridVAS 5161/ 7 1 Guide plate, dia. 22, for V8 - 5 V

Wi t

Body


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Wiper system

The windscreen wiper system used on theAudi A8 has been redesigned on the driver'sside.

The purpose of the revision is to reducenoise levels. This was achieved by using amodied wipe operation.

The wiper blade has an additional pivot pointon the windscreen wiper arm which allows itto turn into the headwind earlier.

The noise level is modied with the support

The midpoint of the wiper follow an orbital path. Theblade ends on the other hathe additional pivot point.

The wiper blade tip initmore quickly to allow it to

slowly.The wiper blade achievnamic working position in


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2 1 3


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All rights reserved.Technical s pecications subjectto change without notice.AUDI AGDept. I/VK-5D-85045 IngolstadtFax +49 841/89-36367940.2810.32.20Technical status 02/99Printed in Germany

Outlook 99

AL 2

Tyre pressure monitoring

TT Roadster

CVT gearbox

Common Rail

V8 5 V engine

Documents

SSP213 New Technology ‘99.pdf