DAF XF105. Manual - part 95

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2-29

Description of components

DMCI ENGINE MANAGEMENT SYSTEM

XF105 series

Fan clutch actuated
If the coil (4) is actuated by way of a duty-cycle 

then the lid (2) will be attracted by the magnetism 

created. The filler opening is then closed by the 

lid (2) and at the same time the return opening is 

opened up. The silicon fluid now flows from the 

working area (7) between the stator (1) and the 

rotor (3) to the supply chamber (6). Less silicon 

fluid in the working area means more slip 

between the stator (1) and the rotor (3). The fan 

speed will decrease.

Note:

Duty cycle high means decreasing fan speed.

Duty cycle low means increasing fan speed.

Actuated

1

2

3

4

5

6

7

i401013

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DMCI ENGINE MANAGEMENT SYSTEM

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©

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Description of components

XF105 series

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©

 200528

3-1

Control functions

DMCI ENGINE MANAGEMENT SYSTEM

XF105 series

3. CONTROL FUNCTIONS

3.1 SYSTEM STATUS

When carrying out calculations, the electronic 

unit always starts with a specific engine "status". 

This status is a specific operating mode of the 

engine. Controls are used or modified depending 

on the status.

To

The electronic unit detects whether the vehicle 

ignition is switched on via connection point B44. 

This status remains active as long as no speed 

signal is received.

Starting

Starting is detected via the engine speed signal. 

The speed must be higher than a specific value, 

but lower than the engine speed when idling.

Idling

The electronic unit detects this status by the 

engine speed. The speed depends on the 

different operating conditions (e.g. coolant 

temperature).

Engine running

The engine speed is higher than a specific value.

System status

Description

On (STATIONARY)

The ignition is switched on, the engine has not yet 

started and is not running.

Starting (CRANKING)

The engine is started.

Idling (IDLING)

The engine is running at idling speed.

Engine running (RUNNING)

The engine is running at speeds higher than idling 

speed.

Cruise (CRUISE)

The engine is running in the cruise control function, 

or a control that adjusts the injection controls to 

keep the vehicle speed constant.

PTO (PTO)

The engine is running in the engine speed control, 

or a control that keeps the engine speed constant 

for driving power take off devices.

Overrevving (OVERSPEEDING)

The engine is running with more rpm than normal 

which may cause mechanical damage.

Off (POWER DOWN)

The engine is switched off and is not running.

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DMCI ENGINE MANAGEMENT SYSTEM

3-2

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Control functions

XF105 series

Cruise

If a voltage signal is received on pin B20 or B16, 

the electronic unit detects that the cruise control 

switch has been operated. There must also be a 

speed signal of 

30 km/h present.

PTO

The PTO status is made known via a CAN 

message via V-CAN1 from VIC-2. The "RES" 

switch on the steering column switch / steering 

wheel switch must also be operated so that DMCI 

receives a CAN message from VIC-2 via V-CAN.

Overrevving

This status is detected when the engine speed is 

higher than a specific value.

Off

Voltage is removed from pin B44. The electronic 

unit detects that the ignition has been switched 

off.