2010 SSANGYONG KYRON sensor

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ENGINE FUEL SYSTEM
OVERVIEW AND OPERATION PROCESS
1. ELECTRONIC CONTROL OF FUEL SYSTEM
According to input signals from various sensors, engine ECU calculates driver's demand
(position of the accelerator pedal) and then controls overall operating performance of engine
and vehicle on that time.
ECU receives signals from sensors via data line and then performs effective engine air-fuel
ratio controls based on those signals. Engine speed is measured by crankshaft speed (position)
sensor and camshaft speed (position) sensor determines injection order and ECU detects
driver's pedal position (driver's demand) through electrical signal that is generated by variable
resistance changes in accelerator pedal sensor. Air flow (hot film) sensor detects intake ai
r
volume and sends the signals to ECU. Especially, the engine ECU controls the air-fuel ratio by
recognizing instant air volume changes from air flow sensor to decrease the emissions (EGR
valve control). Furthermore, ECU uses signals from coolant temperature sensor and ai
r
temperature sensor, booster pressure sensor and atmospheric pressure sensor as
compensation signal to respond to injection starting, pilot injection set values, various
operations and variables.Components
High pressure fuel pump
Fuel injectors -
-Fuel rail
Electronic control unit(ECU) -
-Fuel pressure sensor
Various sensors and actuators -
-Supply line
Return line
ECU connecting line

ENGINE FUEL SYSTEM
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Fuel Line System
Fuel route
2. COMPOSITION OF FUEL SYSTEM
Components in fuel system are designed to generate and distribute high pressure, and they are
controlled electronically by engine ECU. Accordingly, fuel system is completely different from
injection pump type fuel supply system on the conventional Diesel engine. The fuel injection
system in common rail engine is composed of transfer pressure section that transfers fuel in
low pressure, high pressure section that transfers fuel in high pressure and ECU control
section.
High pressure pipe
Common rail
Fuel pressure
sensor
Priming pump
Fuel pump
(High pressure pump, transfer pump)
Fuel filter
Injector
D20DT: 4 EA
D27DT: 5 EA
common rail

ENGINE FUEL SYSTEM
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5. COMPONENTS OF HIGH PRESSURE TRANSFER LINE
In the high pressure section, sufficient fuel pressure that injectors requires will be generated
and stored. The components are as below:
High pressure pump
Rail pressure sensor
Pressure limit valve
Common rail
High pressure pipe
Injector
Fuel pressure regulating valve (IMV) -
-
-
-
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This is plunger pump that generates high
pressure and driven by crankshaft with
timing chain. The high pressure pump
increases system pressure of fuel to approx.
1,600 bar and this compressed fuel is
transferred to high pressure accumulato
r
(common rail) in tube through high pressure
line.
1) High Pressure Pump
It stores fuel transferred from high pressure
pump and also stores actual high pressure
of fuel. Even though the injectors inject fuel
from the rail, the fuel pressure in the rail is
maintained to a specific value. It is because
the effect of accumulator is increased by
unique elasticity of fuel. Fuel pressure is
measured by rail pressure sensor.
And the fuel pressure regulating valve (IMV,
Inlet Metering Valve) included in high
pressure pump housing keeps pressure to a
desired level.
2) Common Rail

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ENGINE INTAKE SYSTEM
VGT Turbocharger
OVERVIEW AND OPERATION PROCESS
1. INTAKE SYSTEM LAYOUT
1) Work Flow of Intake System
HFM Sensor
The HFM sensor is installed in the air intake
passage between the air cleaner and the intake
manifold. It measures the air volume supplied to
the combustion chamber and the ai
r
temperature.
Major Functions
It controls the EGR feedback.
It controls the pressure control valve for the
turbocharger booster. -
-
1. Plug-in sensor
2. Cylinder housing
3. Protection grid
4. Hybrid cover
5. Measuring duct cover
6. Housing
7. Hybrid
8. Sensor
9. Mounting plate
10. O-ring
11. Temperature sensor
Turbocharger
actuator
Intake
(air cleaner)
Com
pressed air
(intercooler)
Exhaust gasExhaust pipe
(diesel catalytic
converter)
Plug-in
sensor
Temperature
sensorProtection grid
Front Air Duct Air Cleaner