DAF XF105. Instruction - page 89

1

©

200528

2-5

Description of components

DMCI ENGINE MANAGEMENT SYSTEM

XF105 series

2.5 INLET AIR BOOST PRESSURE AND TEMPERATURE SENSOR

This is a combined sensor that measures the air

pressure in the inlet manifold and the

temperature of this air. The electronic unit uses

this data to calculate the quantity of air drawn in.

The quantity of intake air needs to be known in

order to calculate the quantity of injected fuel to

prevent smoke. The charge pressure is also in a

direct relationship to the turbocharger pressure

control. The waste gate valve is actuated

depending on this signal.

The charge temperature sensor (3) used is of the

NTC (negative temperature coefficient) type. The

higher the temperature, the lower the resistance

of the sensor. The charge pressure sensor (1) is

a piezoresistive sensor. The inlet air is measured

via an opening (4) in the sensor. The higher the

pressure, the higher the voltage signal. The

sensor is sealed in the installation hole in the

cylinder head by an O-ring (5).

i 400441

i400742

1

2

3

4

5

6

1

Air inlet pressure sensor, piezo-resistive

2

Electrical connection

3

Air inlet temperature sensor, NTC

4

Air inlet opening

5

O-ring

6

Accommodation

1

DMCI ENGINE MANAGEMENT SYSTEM

2-6

©

200528

Description of components

XF105 series

The temperature signal is fed back to the

electronic unit via a connection (2).

A piezoresistive sensor requires a power

supply (3) and earth (1) to create a linear

voltage signal (4).

Effect of temperature signal on the system:
-

calculation of glowing time;

-

correction on the waste gate control;

-

correction on the smoke limiting system.

Effect of pressure signal on the system:
-

calculation for smoke limiting;

-

calculation of the waste gate control;

-

protection of turbocharger;

-

CAN message to VIC for the charge boost

pressure display on the main display of

the DIP.

P

U

T

R

3

4

2

1

i400534

1

©

200528

2-7

Description of components

DMCI ENGINE MANAGEMENT SYSTEM

XF105 series

2.6 FUEL PRESSURE AND TEMPERATURE SENSOR

This is a combined sensor that measures the fuel

pressure in the fuel gallery and the temperature

of this fuel. The sensor is located in the middle of

the fuel gallery between the cylinder 3 pump unit

and the cylinder 4 pump unit. Because of this the

measured values for fuel pressure and

temperature are the most representative for the

whole fuel gallery.

The fuel temperature sensor is of the NTC

(negative temperature coefficient) type. The

higher the temperature, the lower the resistance.

The fuel pressure sensor is a Piëzo capacitive

sensor. The higher the pressure, the higher the

voltage signal.

The temperature signal is fed back to the

electronic unit via a connection (3).

A Piëzo capacitive sensor requires a power

supply (1) and earth (4) to create a linear voltage

signal (2).

Effect of temperature signal on the system:
-

correction of quantity of fuel to be injected;

-

calculation of glowing time;

Effect of pressure signal on the system:
-

enabling fuel pressure to be read on DAVIE;

1

3

4

2

i400792

P

U

T

R

2

1

3

4

i400791

1

DMCI ENGINE MANAGEMENT SYSTEM

2-8

©

200528

Description of components

XF105 series

2.7 ENGINE OIL PRESSURE AND TEMPERATURE SENSOR

This is a combined sensor that measures the

engine oil pressure in the cylinder block main

passage and the temperature of this oil.

The engine oil temperature sensor used is of the

NTC (negative temperature coefficient) type. The

higher the temperature, the lower the resistance

of the sensor. The engine oil pressure sensor is a

Piëzo capacitive sensor. The higher the pressure,

the higher the voltage signal. The engine oil

pressure is measured via an opening in the

sensor. The higher the pressure, the higher the

voltage signal.

The temperature signal is fed back to the

electronic unit via a connection (3). A piëzo-

capacitive sensor requires a power supply (1)

and earth (4) to create a linear voltage signal (2).

Effect of temperature signal on the system:
-

none.

Effect of pressure signal on the system:
-

CAN message to VIC to actuate oil pressure

indicator light and warning on the DIP main

display when engine oil pressure is too low.

1

3

4

2

i400792

P

U

T

R

2

1

3

4

i400791

Рассказать друзьям