Iveco Daily. Manual — part 434
262
ELECTRIC/ELECTRONIC SYSTEM
D
AILY
Base - May 2004
The vehicles not equipped with ABS / EBS / ABD system need
a system providing a better control of the braking action on
the rear wheels. This system includes an dual brake action
compensator and a brake action compensator pneumatic
actuator.
Depending on the load applied on the rear axle, as detected
by the pneumatic actuator, the brake action compensator
automatically adjust the braking torque applied to the axle by
the brakes.
The diagram shows the compensation ratio corresponding to
0.15 as a function air spring variations.
BRAKE ACTION COMPENSATOR UNIT
1. Dual brake action compensator
2. Pneumatic actuator for brake action compensator
OPERATION DIAGRAM
A. Hydraulic output pressure (bars) - B. Hydraulic control
pressure (bars) - C. Pneumatic control pressure (bars) -
D. Characteristic curve with 0.15 ratio (empy) -
E. 1:1 ratio (loaded) - F. Characteristic curve of pneumatic
pressure/load
1
2
Figure 304
Figure 305
000372t
000371t
ELECTRIC/ELECTRONIC SYSTEM
263
D
AILY
A" Braking action
B" Braking action with empty vehicle
C" Braking action with laden vehicle
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Figure 306
Figure 307
Figure 308
000219t
000220t
000221t
264
ELECTRIC/ELECTRONIC SYSTEM
D
AILY
Base - May 2004
This operation is allowed at a speed below 15 Km/h; as soon as this speed is exceeded, automatic chassis leveling is actuated.
Proceed as follow to lift the chassis:
- Press chassis lifting push-button and keep it pressed to enable the relay to close the switch and receive a 5A supply. Now,
the control unit commands the relay to start the compressor (6) electrical motor (2). Air is then aspirated through the filter
(3), compressed and delivered into the system via the one-way valve and the drying filter (7).
Simultaneously, the control unit starts solenoid valves 4" and 5" so that the compressed air is supplied to the suspension
air springs to lift the chassis.
During the entire operation, the red warning lamp on the dashboard panel shall flash to inform the driver that the chassis is off
trim.
The warning lamp shall keep flashing until the chassis is off normal trim.
Chassis lowering is stopped as the push-button is released while the chassis level reached is maintained.
The maximum height is set by level sensors according to the calibration data memorized in the electronic control unit.
Maximum lifting actuation time is 2 minutes to prevent preheats that could damage the electro compressor.
SYSTEM OPERATION DIAGRAM
1. Exhaust solenoid valve - 2. Electrical motor control relay - 3. Intake filter - 4. RH chassis control solenoid valve -
5. LH chassis control solenoid valve - 6. Compressor - 7. Dryer filter - 8. Compressor control electrical motor -
9. Electrical connector
Figure 309
000224t
ELECTRIC/ELECTRONIC SYSTEM
265
D
AILY
Chassis lowering
This operation is allowed at a speed below 15 Km/h; as soon as this speed is exceeded, automatic chassis leveling is actuated.
Proceed as follow to lower the chassis:
- Press the lowering push-button and keep it pressed to enable the relay to send a signal to the control unit to energize solenoid
valves (4) and (5) and the exhaust valve (1).
The compressed air contained in the suspension air springs can flow back through the dryier filter 7" for cleaning and, as
imposed by the closed one-way valve, flow to the relief solenoid valve to be released in the atmosphere through the intake
filter.
During the entire operation, the red warning lamp on the dashboard panel shall flash to inform the driver that the chassis is off
trim.
The warning lamp shall keep flashing until the chassis is off normal trim.
Chassis lowering is stopped as the push-button is released while the chassis level reached is maintained.
The maximum height is set by level sensors according to the calibration data memorized in the electronic control unit.
SYSTEM OPERATION DIAGRAM
1. Exhaust solenoid valve - 2. Electrical motor control relay - 3. Intake filter - 4. RH chassis control solenoid valve -
5. LH chassis control solenoid valve - 6. Compressor - 7. Dryer filter - 8. Compressor control electrical motor -
9. Electrical connector
Figure 310
000223t
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