DAF XF105. Instruction - page 89
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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).
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Air inlet pressure sensor, piezo-resistive
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Electrical connection
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Air inlet temperature sensor, NTC
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Air inlet opening
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O-ring
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Accommodation
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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.
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©
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;
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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.
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