820_153

ATC Automatic Temperature Controlfor Trucks, Buses and Coaches

Prospekt ATC -E 23.08.2004 15:35 Uhr Seite 1

■ Driver option to modify the comfortlevel via the flaps and fan controls

■ A comprehensive on-board diagnostic system

■ Individual electronics system for busesand motor coaches which communi-cates with the operating console via aCAN interface

■ Operating console with integrateddisplay for vehicles without centraldisplay

WABCO AutomaticTemperature Control systemoffers customers a broadrange of clear benefits

■ Simple adjustment to the required setting on the dashboard

■ Frees the driver from the need to dorepeated re-adjustments

■ Temperature control accuracy of ≤ 1°C

■ Regulation of compartment tempera-ture provides driver and passengercomfort at various outdoor tempera-tures, traveling and engine speeds

■ Integrated control of the auxiliary heating and air conditioning systems

■ Continuous regulation of the heaterfan speed

■ Automatic regulation of heating andventilation

ATC offers clear benefits

2 Automatic Temperature ControlATC


ATC 3

throughput of air on warm days and, whenlow temperatures prevail, it ensures thatthe driver’s cabin heats up quickly and thewindscreen is de-iced rapidly.

In the first case, the volume of air is regu-lated continuously, while in the secondcase the water flow is controlled. This regulation also takes place if the vehicle isfitted with an additional air conditioningunit.

Furthermore, ATC allows the driver toswitch off the automatic mode and regu-late the speed of the fan manually.

ATC components for trucks

■ Control electronics

■ Fan module

■ Valve unit including water valve, pulse or DC motor and limit switch

■ Temperature sensors to register theexternal, internal and outlet tempera-ture at the heat exchanger (heater)

ATC in trucks

When traveling long distances, it has beentratitionally necessary to continuously re-adjust the manual heater in order toachieve an agreeable temperature in thedriver’s cabin.

The ATC electronic system regulates thetemperature in line with a characteristiccurve designed to reflect the humansense of comfort. When the outside tem-perature is low, a slightly higher tempera-ture is generated on the inside without thedriver’s intervention, e.g. by re-adjustingthe set value or other manual alterations. In addition, ATC provides for an increased

ATC components for trucks



More comfort on city buses and motor coaches

Operation

The water and/or air quantity for the passenger and driver sections are con-trolled separately. The system for the pas-senger section can be switched off by apushbutton.

To control the temperature of the driversection, the city bus driver has all theusual compact controls within easy reach.The control facility also ensures a pleasantenvironment for this area.

ATC components for buses

■ Operating console for controlling thetemperature in the driver’s cab andpassenger areas

■ Substations

■ Fan module

■ Temperature sensors to register external, internal and outlet tempera-ture at the heat exchangers

■ Water temperature sensor

ATC in city buses

VDV Publication 236 has established anew basis for air conditioning in citybuses. In a further development we haveprovided for the use of WABCO compo-nents to fully meet these requirements.The WABCO air conditioning componentsbenefit from the experience and the volume effects of our various systems forcommercial vehicles. The componentshave CAN interfaces to allow them tocommunicate with each other and withother systems.

WABCO’s operating console is based onfour basic modules, to be used in differentconfigurations together with substations.


ATC 5

ATC in motor coaches

Based on the ATC city bus system, amore complex variant has been develo-ped for motor coaches. This also consistsof an operating console and up to eightsubstations (identical to the city bus sub-stations). Unlike in buses, however, ATC inmotor coaches provides for a larger scopeof intervention by the driver. Temperatures,index values and fan speeds are shownon the dashboard display. A timer for thepre-selection of the auxiliary heatingsystem has also been integrated in thecontrol system.

WABCO’s diagnostic controller and othercustom-made diagnostic equipment canbe used on all ATC CAN systems.

For vehicles without a central display,WABCO offers an operating console withan integrated display. It indicates the basic settings or the current adjustmentaccording to the driver’s demand withouttime delay. Moreover, the display directlydelivers error messages when the systemfails. The operating console with displayfits perfectly into the family of ATC CANsystems, featuring high operating comfortand excellent control.


ATC components at a glance


ATC Truck ECU446 090 024 0

ATC CAN City Bus446 195 001 0 446 195 004 0446 195 002 0446 195 003 0

ATC CAN Motor Coach446 197 001 0 446 197 004 0446 197 002 0 446 197 005 0446 197 003 0

Display/Operating Console446 197 040 0

ATC CAN Substation446 196 000 0

Fan Module446 024 012 0

Using six characteristics for which theparameters can be set, this ECU controlsa water valve, the fan and the flaps, together with a potentiometer.

The modular concept permits comfortablecontrol of driver’s and passenger’s areas.Heating/ventilation/air conditioning com-ponents are actuated automatically.

Unlike the city bus variant, this operatingconsole permits a wide range of settingsfor the passenger area.

The operating console with displayexpands the application of the ATC CANsystems to vehicles without central indicating device.

The modular design is achieved by thissubstation. These universal substationsare used depending on the type of equipment fitted.

This fan module is used for the continuousactuation of the pulse-width modulationfor fans (max. 14 amps).

lighting switchignition

main power cut-offbattery

Cl. 58Cl. 15Cl. 30

Cl. 31 auxi

liary

hea

ting

oper

atio

n vi

a W

ake-

Up

switch clock

erro

r lam

p

exte

rnal

refe

renc

e va

lue

pote

ntio

met

er

X12/

3X1

5/15

CAN vehicle bus

inte

rface

H

inte

rface

GND

inte

rface

L

mot

or s

igna

l D+

61do

or s

igna

lsa

ver c

ircui

tse

cond

ary

supp

ly

AT fr

ont b

ox

outs

ide

tem

pera

ture

water valvefront box

servomotorfront window flap

AT fl

oor

room

tem

pera

ture

servomotorfresh air flap

water valvefloor front

puls

e-w

idth

mod

ulat

or fr

ont f

an

com

pres

sor c

oupl

ing

orco

olin

g ag

ent v

alve

pass

enge

r are

a fa

nst

age

1pa

ssen

ger a

rea

fan

stag

e 2

wat

er p

ump

auxi

liary

hea

ting

on/o

ff

addi

tiona

l hea

ting

Econ

/Pow

er

Coding 1 Coding 2

X9/4

X9/5

X9/3

X9/1

X9/2

+24

V

Cl. 3

1 Cl. 3

0

wat

er te

mp.

sen

sor water valve

roof

room

tem

p. s

enso

rbl

ow-o

ff se

nsor

roof

rear

icin

g se

nsor

roof flapleft

roof flapright

puls

e-w

idth

mod

ulat

orev

apor

ator

fan

roof

hat

ches

pass

enge

r are

a fa

nre

ar s

tage

1

pass

enge

r are

a fa

nre

ar s

tage

2ro

of v

entil

ator

sta

ged

1

roof

ven

tilat

or s

tage

d 2

cond

enso

r fan

high

-pre

ssur

e sw

itch

low

-pre

ssur

e sw

itch

refri

gera

tion

com

pres

sor

Wak

e-up

(Cl.

15)

inte

rface

Lin

terfa

ce G

NDin

terfa

ce H

Operating Console 446 195 001/002/003 0 / 197 000 0

Substation 446 196 000 0

System Arrangements ATC Buses

ATC components


ATC 7

Water ValveDC-446 091 002 0STEP.-446 091 001 0

Large Water ValveDC(2/2-Way) 446 091 004 0DC(3/2-Way) 446 091 200 0

Air Outlet Temperature Sensor446 092 003 0

Water Temperature Sensor446 097 001 0

Outside Temperature Sensor446 097 000 0

Water Valve – manual446 091 500 2

DC and step motor variants are availablefor the electrical water valve, with a maxi-mum of 1,400 l/h.

Both water valves have a flow rate of1,800 l/h and are actuated by a DC motorwith potentiometer return.

At the outlet of the heat exchanger, thissensor picks up the air outlet temperatureand transmits it to the ECU as an electrical value.

The vehicle’s initial behavior (includingauxiliary heating) is picked up by this temperature sensor via the water of theheating system.

To maintain the comfort characteristic, the disturbance variable of the outsidetemperature is monitored by our elec-tronic control units.

In vehicles without ATC ECU, the drivercan control the water quantity for thewater valve via a bowden cable.

ATC ELECTRONICS 446 090 020 0

ADJUSTABLE• BLOWER SPEED• ROOM

TEMPERATUREFUNCTIONSWITCH0 OFF1 FAN MAN2 AUTO3 DRY/REHEAT4 DEFROST

SPEE

D SI

GNAL

DIAG

NOSI

SFA

ILUR

E LA

MP

AIR

COND

ITIO

NING

AUXI

LIAR

YHE

ATIN

G

STEP

MOT

ORW

ATER

VAL

VE

BLOW

ERM

ODUL

E

FRES

H AI

R AN

DSM

OG F

LAPS

OUTS

IDE

ROOM

HEAT

EXC

HANG

ER-

TEM

PERA

TURE

System Arrangements ATC Trucks

ATC components


© 2

004

Am

eric

an S

tand

ard

Com

pani

es In

c. A

ll rig

hts

rese

rved

. 820

001

153

3/08

.200

4

WABCO, the vehicle control systems busi-ness of American Standard Companies, isthe world’s leading producer of electronicbraking, stability, suspension and trans-mission control systems for heavy duty com-mercial vehicles. WABCO products arealso increasingly used in luxury cars andsport utility vehicles (SUVs). Customersinclude the world’s leading commercialtruck, trailer, bus and passenger car man-ufacturers. Founded in the US 135 years

ago as Westinghouse Air Brake Company,WABCO was acquired by AmericanStandard in 1968. Headquartered inBrussels, Belgium, the business todayemploys nearly 6500 people in 29 officeand production facilities worldwide. In2003, WABCO contributed US$ 1.358 billion to American Standard’s total salesof US$ 8.568 billion.

Website: www.wabco-auto.com

Vehicle Control SystemsAn American Standard Company

WABCO WORLDWIDE


820_153

Documents