Iveco Stralis AT/AD. Manual - part 259
Figure 68
Figure 69
This device brakes the driving wheels, via the brake anti-lock
modulator, whenever a tendency for one or more driving
wheels to skid is detected.
The valve is normally closed. When the electronic control unit
detects a tendency to skid of one or more driving wheels, it
sends a signal to the solenoid valve, which energizes and lets
air pass to the brake anti-lock modulators that brake the
wheels. The solenoid valve de-energizes when the wheels
have reached the right degree of friction on the road surface.
35384
526713
Speed sensor
566712
Phonic wheels
35383
The speed sensors and phonic wheels have the job of
detecting the speeds of the respective wheels.
The phonic wheel is housed on the wheel hub and turns at
the same speed as the wheel. It generates alternating voltages
in the sensors by induction. The frequency of these voltages
is in proportion to the speed of rotation of the respective
wheel. These voltage signals are transmitted to the control
unit to be suitably processed. A sensor and a phonic wheel
are fitted for each wheel. This arrangement makes it possible
to control an individual braking pressure for each wheel
during adjustment, optimizing travelling stability and braking
distance.
526724
Electro-pneumatic valve for ASR
526711
Electronic control unit
35384
73925
A = ABS — EBL electronic control unit
B = EBS electronic control unit
Its purpose is to control the brake system, producing
deceleration in relation to the parameters detected by the
various system components.
The electronic control unit is equipped with a highly
advanced self-diagnosis system and it is able to identify and
save any trouble, even of an intermittent nature, occurring to
the system during operation, in relation to the environmental
conditions, ensuring the most correct and reliable repairs.
Compared to the ABS control unit, the EBS control unit is
able to govern auxiliary deceleration systems (exhaust brake
and Retarder), optimizing the action so as to ensure better
system operation and moreover reduce brake lining wear.
Figure 70
Pressure sensor
In ABS/EBL systems, its job is to inform the electronic control
unit of the extent of action required by the driver.
In EBS systems, this component is integrated in the front axle,
rear axle and trailer control valves.
52722
Figure 71
S
TRALIS
AT/AD
94
AIR SYSTEM - BRAKES
Base - January 2003