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DAF XF105. Manual - part 96

200528

3-3

Control functions

DMCI ENGINE MANAGEMENT SYSTEM

XF105 series

3.2 CAN CONTROLS

The DMCI engine management system

communicates via V-CAN1 and V-CAN2 with

various vehicle systems. DMCI is equipped with a

terminating resistor for V-CAN1 and V-CAN2.

The DMCI electronic unit receives relevant

information from other electronic units and sends

information to these electronic units in its turn.

Communication with DAVIE XD takes place via

the D-CAN to VIC-2 and via VIC-2 and V-CAN1

again to DMCI.

A number of important CAN messages are shown

below.

i400994

Vehicle

CAN2-low

Vehicle
CAN2-high

CAN2 low

CAN2 high

B42

B46

B53

B45

Vehicle

CAN1-low

Vehicle
CAN1-high

CAN1 low

CAN1 high

B35

B27

B50

B54

D965

DMCI

V-CAN1

V-CAN2

VIC-2

EAS

DIP-4

AS Tronic

BBM

Immobiliser

MTCO / DTCO

ZF retarder EST-42

ABS-D

EBS-2

ECAS-4

DMCI ENGINE MANAGEMENT SYSTEM

3-4

200528

Control functions

XF105 series

Received CAN messages:
-

request to activate the PTO/engine speed

control via application connector (BBM)

immobiliser identification code to release fuel

supply (immobiliser)

activation of ABS (EBS-2/ABS-D)

activation of ASR (EBS-2/ABS-D)

activation of ZF intarder (EST-42)

vehicle speed signal (MTCO/DTCO)

activation of cruise control (VIC-2)

activation of PTO/engine speed control via

steering column switch (VIC-2)

Sent CAN messages:
-

red and yellow fault messages (VIC-2)

coolant temperature (VIC-2)

engine speed (DIP-4, EAS, EBS-2, etc.)

engine torque (EAS, EBS-2, AS Tronic)

inlet air boost pressure (VIC-2)

engine oil pressure (VIC-2)

accelerator pedal position (ZF-intarder)

engine brake activation (AS Tronic)

activation of parking brake (VIC-2)

status of variable vehicle speed limiting

(VIC-2)

status of vehicle speed limiting for special

applications (VIC-2)

fuel consumption (VIC-2)

200528

3-5

Control functions

DMCI ENGINE MANAGEMENT SYSTEM

XF105 series

3.3 PRE-GLOWING AND AFTER-GLOWING

The purpose of the glowing system is to warm up

the inlet air so that the engine starts up more

easily and so that the engine runs more smoothly

if the outside temperature is low. During pre-

glowing, the inlet air is heated before the engine

starts. Glowing can also take place while the

engine is starting. After-glowing takes place when

the engine is running. Pre-glowing and glowing

when starting mean that the engine starts

smoothly. Glowing when starting and after-

glowing reduce emissions (white smoke) in cold

conditions.

Depending on the number of input signals, the

electronic unit determines whether pre-glowing

and possibly after-glowing are necessary. If the

ignition is switched on then the electronic unit

compares the following temperatures:

coolant temperature (F566),

inlet air temperature (F649),

fuel temperature (F713).

If one of these three temperatures is lower than a

certain programmed temperature then the

electronic unit will decide to activate the glow plug

relay. De laagste temperatuur van deze drie

bepaalt de tijdsduur van het voorgloeien.

Voorgloeien zal altijd gevolgd worden door

gloeien tijdens starten.

After-glowing is also determined by the lowest of

the three temperature signals (coolant, inlet air

and fuel). Glowing during starting and after-

glowing prevents the emission of white smoke.

The electronic unit provides a glow plug relay

(G014) with current via pin C60,C61 and C62.

The glow relay (G014) is activated when the

electronic unit switches the relay to earth via pin

C32. If the glow plug relay is activated then the

glow element (B341) is provided with current via

the fuse (E392). At the same time the electronic

unit receives a current at pin C39. The electronic

unit can determine via this input whether the

glowing system is active, remains active when

not wanted or can not be activated. The

electronic unit then sends a CAN message to

VIC-2 to control the glow indication on DIP 4 or a

warning on the main display.

i400992

D965

kl. 30

temp.

F649

2 1

signal

ground

3 4

supply 5V

signal

shield

inlet

pres.

boost

pres.

F713

1 2

signal

ground

fuel

temp.

fuel

ground

signal

F566

temp.

coolant

Glow element

relay

G014

Glow
element

Main
relay

B314

supply

C32

C39

C60

C61

C62

engine

ground

Vehicle

CAN2

low

Vehicle
CAN2
high

E184
(10A)

E112

E392

(5A)

G126

(100A)

E118
(15A)

2 1

signal

return

F552

speed

crankshaft

C26

A34

A46

C25

A45

A41

A42

A27

A28

A30

A49

A50

A60

supply

CAN2 low

CAN2 high

C60

C61

C62

87 86

87a

B53

B45

Vehicle

CAN1

low

Vehicle
CAN1
high

CAN1 low

CAN1 high

B35

B27

DMCI ENGINE MANAGEMENT SYSTEM

3-6

200528

Control functions

XF105 series

Conditions for activating the pre-glowing
function:
1.

Battery voltage must be higher than a

specific value and

one of the three temperatures(coolant, inlet

air or fuel) must be lower than a specific

value when the ignition is turned on, and

no speed signal may be present.

If pre-glowing is active, the glow indicator on

DIP must be activated. The pre-glowing time is

3 minutes at most.

Conditions for activating glowing when
starting:
1.

When starting the engine and pre-glowing

has been activated and

the battery voltage during starting is higher

than a specific value and

the engine speed is lower than idling speed.

If glowing is active during starting, the glow

indicator on DIP must be activated.

Conditions for activating after-glowing:
1.

Battery voltage must be higher than a

specific value,

at least one of the three temperatures

(coolant, inlet air or fuel) must be lower than

a specific value when the ignition is turned

on, and

the engine speed must be higher than a

specific value.

If after-glowing is active, the glow indicator on

DIP must be activated. The after-glowing time is

3 minutes at most.

Relevant components

Coolant temperature sensor (F566)

Charge boost pressure and temperature

sensor (F649)

Fuel pressure and temperature

sensor (F713)

Crankshaft sensor (F552)

Glow plug relay (G014)

Glow element (B341) and

Battery voltage (G126)

VIC-2 (D310 via V-CAN1 and V-CAN2)

Content .. 94 95 96 97 ..