Iveco Daily. Manual — part 388

116

ELECTRIC/ELECTRONIC SYSTEM

D

AILY

Base - May 2004

The system shown is used on the following vehicles: 29 L - 35 S

1. Electrohydraulic modulator - 2. Vacuum pump - 3. Vacuum tank - 4. Vacuum servobrake - 5. Hydraulic control sockets

- 6. Parking brake lever - 7. Rear brake caliper - 8. Rear disk brake - 9. Electronic control unit - 10. Sensor -

11. Phonic wheel - 12. Front brake disk - 13. Front brake caliper

13

12

11 10

9

1

2

3

4

5

6

7

8

Figure 115

ELECTRIC/ELECTRONIC SYSTEM

117

D

AILY

Location of components

1. Eectrohydraulic modulator - 2. Vacuum pump - 3. Vacuum tank - 4. Vacuum servobrake - 5. Hydraulic control sockets

- 7. Rear brake caliper - 8. Rear disk brake - 9. Electronic control unit 88000 - 10. Sensor 88001- 11. Phonic wheel -

12. Front brake disk - 13. Front brake caliper

1

2

3

4

5

7

8

9

10

11

12

13

Figure 116

118

ELECTRIC/ELECTRONIC SYSTEM

D

AILY

Base - May 2004

The sensors supply the electronic control unit all the useful

information, with the necessary continuity, for it to be able

to control the solenoid valves.
The signals are obtained by magnetic flux lines which are

closed through the teeth of an iron toothed wheel facing the

sensor and turned with the wheel.
The passage from solid to hollow, due to the presence or

absence of the tooth determines a change of the magnetic

flux which is enough to create an electromotive force

induced at the terminals of the sensor and thus an alternate

electric signal, which is sent to the electronic control unit.

SENSOR ON PHONIC WHEEL

A. Phonic wheel

A

The distance between the sensor and the wheel, called gap,

must clearly have a pre-established value so that correct

signals are supplied (0,8 to ÷ 1,6 mm).
The resistance rating of each single sensor detected at the

ends of the connector is between 1÷ 2 kΩ.
The toothed wheel is called phonic wheel because the signal

it generates has the frequency of a sound wave.
The frequency of this signal serves to define the wheel

rotation speed.
The changes of the frequency, i.e. the rapidity with which the

signals follow one another serve to define the acceleration

and deceleration values.

Figure 117

ELECTRIC/ELECTRONIC SYSTEM

119

D

AILY

Electrohydraulic control unit/modulator

The component integrates both the electronic part and the

hydraulic modulator for system management.
It comprises the following:
A - Electronic control unit
B - Electrohydraulic modulator
C - Accumulator
It is connected to the hydraulic system by the following

connections:

MC1 - Diagonal supply LF/RR
MC2 - Diagonal supply RF/LR
LF - Left front axle output
RR - Right rear axle output
RF - Right front axle output
LR - Left rear axle output
It is connected to the electric system through a 31-pin

connector.

CONTROL UNIT/ELECTROHYDRAULIC MODULATOR

MCI

RR

LR

LF

RF

C

B

A

MC2

Figure 118