ATC Automatic Temperature Control for Trucks, Buses

Prospekt ATC -E 23.08.2004 15:35 Uhr Seite 1
ATC
Automatic Temperature Control
for Trucks, Buses and Coaches
Prospekt ATC -E 23.08.2004 15:36 Uhr Seite 2
2
ATC
Automatic Temperature Control
ATC offers clear benefits
WABCO Automatic
Temperature Control system
offers customers a broad
range of clear benefits
■ Simple adjustment to the required
setting on the dashboard
■ Frees the driver from the need to do
repeated re-adjustments
■ Temperature control accuracy
of ≤ 1°C
■ Regulation of compartment tempera-
ture provides driver and passenger
comfort at various outdoor temperatures, traveling and engine speeds
■ Integrated control of the auxiliary
heating and air conditioning systems
■ Continuous regulation of the heater
fan speed
■ Automatic regulation of heating and
ventilation
■ Driver option to modify the comfort
level via the flaps and fan controls
■ A comprehensive on-board
diagnostic system
■ Individual electronics system for buses
and motor coaches which communicates with the operating console via a
CAN interface
■ Operating console with integrated
display for vehicles without central
display
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ATC
3
ATC components for trucks
ATC components for
trucks
■ Control electronics
■ Fan module
■ Valve unit including water valve,
ATC in trucks
When traveling long distances, it has been
tratitionally necessary to continuously
re-adjust the manual heater in order to
achieve an agreeable temperature in the
driver’s cabin.
pulse or DC motor and limit switch
■ Temperature sensors to register the
external, internal and outlet temperature at the heat exchanger (heater)
The ATC electronic system regulates the
temperature in line with a characteristic
curve designed to reflect the human
sense of comfort. When the outside temperature is low, a slightly higher temperature is generated on the inside without the
driver’s intervention, e.g. by re-adjusting
the set value or other manual alterations.
In addition, ATC provides for an increased
throughput of air on warm days and, when
low temperatures prevail, it ensures that
the driver’s cabin heats up quickly and the
windscreen is de-iced rapidly.
In the first case, the volume of air is regulated continuously, while in the second
case the water flow is controlled. This
regulation also takes place if the vehicle is
fitted with an additional air conditioning
unit.
Furthermore, ATC allows the driver to
switch off the automatic mode and regulate the speed of the fan manually.
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ATC
Automatic Temperature Control
More comfort on city buses
and motor coaches
ATC components
for buses
■ Operating console for controlling the
temperature in the driver’s cab and
passenger areas
■ Substations
■ Fan module
■ Temperature sensors to register
external, internal and outlet temperature at the heat exchangers
■ Water temperature sensor
ATC in city buses
Operation
VDV Publication 236 has established a
new basis for air conditioning in city
buses. In a further development we have
provided for the use of WABCO components to fully meet these requirements.
The WABCO air conditioning components
benefit from the experience and the
volume effects of our various systems for
commercial vehicles. The components
have CAN interfaces to allow them to
communicate with each other and with
other systems.
The water and/or air quantity for the
passenger and driver sections are controlled separately. The system for the passenger section can be switched off by a
pushbutton.
WABCO’s operating console is based on
four basic modules, to be used in different
configurations together with substations.
To control the temperature of the driver
section, the city bus driver has all the
usual compact controls within easy reach.
The control facility also ensures a pleasant
environment for this area.
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ATC
ATC in motor coaches
Based on the ATC city bus system, a
more complex variant has been developed for motor coaches. This also consists
of an operating console and up to eight
substations (identical to the city bus substations). Unlike in buses, however, ATC in
motor coaches provides for a larger scope
of intervention by the driver. Temperatures,
index values and fan speeds are shown
on the dashboard display. A timer for the
pre-selection of the auxiliary heating
system has also been integrated in the
control system.
WABCO’s diagnostic controller and other
custom-made diagnostic equipment can
be used on all ATC CAN systems.
For vehicles without a central display,
WABCO offers an operating console with
an integrated display. It indicates the
basic settings or the current adjustment
according to the driver’s demand without
time delay. Moreover, the display directly
delivers error messages when the system
fails. The operating console with display
fits perfectly into the family of ATC CAN
systems, featuring high operating comfort
and excellent control.
5
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ATC
Automatic Temperature Control
ATC components at a glance
System Arrangements ATC Buses
switch clock
interface L
interface GND
interface H
X12/3
X15/15
external reference
value potentiometer
Cl. 31
error lamp
main power cut-off
battery
CAN vehicle bus
operation via
Wake-Up
Cl. 58
Cl. 15
Cl. 30
auxiliary heating
lighting switch
ignition
additional heating Econ/Power
Cl. 30
X9/2
X9/5
X9/3
X9/1
Coding 2
Coding 1
X9/4
water pump
auxiliary heating on/off
compressor coupling or
cooling agent valve
passenger area fan
stage 1
passenger area fan
stage 2
water valve
floor front
Cl. 31
pulse-width modulator front fan
servomotor
fresh air flap
+24 V
servomotor
front window flap
room temperature
water valve
front box
AT floor
outside temperature
AT front box
motor signal D+61
door signal
saver circuit
secondary supply
Operating Console 446 195 001/002/003 0 / 197 000 0
Wake-up (Cl. 15)
interface L
interface GND
interface H
low-pressure switch
high-pressure switch
roof flap
right
condensor fan
roof flap
left
pulse-width modulator
evaporator fan
roof hatches
passenger area fan
rear stage 1
passenger area fan
rear stage 2
roof ventilator staged 1
roof ventilator staged 2
water valve
roof
room temp. sensor
blow-off sensor
roof rear
icing sensor
water temp. sensor
refrigeration
compressor
Substation 446 196 000 0
ATC components
ATC Truck ECU
446 090 024 0
Using six characteristics for which the
parameters can be set, this ECU controls
a water valve, the fan and the flaps,
together with a potentiometer.
ATC CAN City Bus
446 195 001 0
446 195 004 0
446 195 002 0
446 195 003 0
The modular concept permits comfortable
control of driver’s and passenger’s areas.
Heating/ventilation/air conditioning components are actuated automatically.
ATC CAN Motor Coach
446 197 001 0
446 197 004 0
446 197 002 0
446 197 005 0
446 197 003 0
Unlike the city bus variant, this operating
console permits a wide range of settings
for the passenger area.
Display/Operating Console
446 197 040 0
The operating console with display
expands the application of the ATC CAN
systems to vehicles without central
indicating device.
ATC CAN Substation
446 196 000 0
The modular design is achieved by this
substation. These universal substations
are used depending on the type of
equipment fitted.
Fan Module
446 024 012 0
This fan module is used for the continuous
actuation of the pulse-width modulation
for fans (max. 14 amps).
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ATC
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System Arrangements ATC Trucks
ATC ELECTRONICS 446 090 020 0
ADJUSTABLE
FUNCTION
SWITCH
OUTSIDE
ROOM
HEAT EXCHANGERTEMPERATURE
OFF
FAN MAN
AUTO
DRY/REHEAT
DEFROST
FRESH AIR AND
SMOG FLAPS
BLOWER
MODULE
STEP MOTOR
WATER VALVE
AUXILIARY
HEATING
AIR CONDITIONING
SPEED SIGNAL
DIAGNOSIS
FAILURE LAMP
0
1
2
3
4
• BLOWER SPEED
• ROOM
TEMPERATURE
ATC components
Water Valve
DC - 446 091 002 0
STEP.- 446 091 001 0
DC and step motor variants are available
for the electrical water valve, with a maximum of 1,400 l/h.
Large Water Valve
DC (2/2-Way) 446 091 004 0
DC (3/2-Way) 446 091 200 0
Both water valves have a flow rate of
1,800 l/h and are actuated by a DC motor
with potentiometer return.
Air Outlet Temperature Sensor
446 092 003 0
At the outlet of the heat exchanger, this
sensor picks up the air outlet temperature
and transmits it to the ECU as an
electrical value.
Water Temperature Sensor
446 097 001 0
The vehicle’s initial behavior (including
auxiliary heating) is picked up by this
temperature sensor via the water of the
heating system.
Outside Temperature Sensor
446 097 000 0
To maintain the comfort characteristic,
the disturbance variable of the outside
temperature is monitored by our electronic control units.
Water Valve – manual
446 091 500 2
In vehicles without ATC ECU, the driver
can control the water quantity for the
water valve via a bowden cable.
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WABCO, the vehicle control systems business of American Standard Companies, is
the world’s leading producer of electronic
braking, stability, suspension and transmission control systems for heavy duty commercial vehicles. WABCO products are
also increasingly used in luxury cars and
sport utility vehicles (SUVs). Customers
include the world’s leading commercial
truck, trailer, bus and passenger car manufacturers. Founded in the US 135 years
ago as Westinghouse Air Brake Company,
WABCO was acquired by American
Standard in 1968. Headquartered in
Brussels, Belgium, the business today
employs nearly 6500 people in 29 office
and production facilities worldwide. In
2003, WABCO contributed US$ 1.358
billion to American Standard’s total sales
of US$ 8.568 billion.
Website: www.wabco-auto.com
Vehicle Control Systems
An American Standard Company
© 2004 American Standard Companies Inc. All rights reserved. 820 001 153 3/08.2004
WABCO WORLDWIDE
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