fuel SSANGYONG RODIUS 2006 User Guide

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ENGINE GENERAL
RODIUS 2007.07
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3) Fuel System

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RODIUS 2007.07
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ENGINE GENERAL
▶Fuel Supply System

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ENGINE FUEL SYSTEM
RODIUS 2007.07
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1881-09ENGINE FUEL SYSTEM
MAJOR CHANGES IN FUEL SYSTEM OF D27DTP
(POWER UP) ENGINE 1.
There are some changes in the parts related to the fuel system due to the newly adopted
D27DTP (POWER UP) engine. The major changes are as follows. Refer to the next pages fo
r
further details.
1) Injector
Two nozzle holes are added (currently 7)
to the tip of the injector to increase the
amount of fuel injection and to improve
injection efficiency according to the
increased engine power.
The existing C2I coding (16 digits) is
changed to C3I coding (20 digits) to
monitor fuel injection and follow the
target value.
For the D27DT engine, the injector MDP
(minumum current for the solenoid in the
injector to lift the nozzle) is leaned only
when the engine is running. However, fo
r
the D27DTP engine, it is learned when
the vehicle is in motion and the engine is
at idle speed. ·
·
· D27DTP & D27DT (EU IV)
D27DT

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RODIUS 2007.07
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ENGINE FUEL SYSTEM
2) Common Rail
The orifice is added to the connection to
the fuel pipe of the HP pump to prevent
the fuel pulsation by the fuel supply and
fuel cut according to the increase o
f
injected fuel volume. (It is also installed
on the connection of the high pressure
fuel supply line of the HP pump.)
·
D27DTP & D27DT (EU IV)
D27DT

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ENGINE FUEL SYSTEM
RODIUS 2007.07
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3) Fuel Rail - Chrome Color
D27DTP & D27DT (EU IV) * Fuel pipe (Common rail → Injector)
* Fuel high pressure pipe (HP pump →
　
Common rail)
D27DT * Fuel pipe (Common rail → Injector)
* Fuel high pressure pipe (HP pump →
Common rail) The I.D and O.D of the fuel rail between
HP pump and common rail are increased
according to the increased amount of fuel
injection.
Also, the engine ECU, HFM sensor and
EGR system are changed to control the
fuel injection volume and engine more
precisely.
·

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RODIUS 2007.07
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ENGINE FUEL SYSTEM
2. COMPONENTS OF FUEL SYSTEM

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ENGINE FUEL SYSTEM
RODIUS 2007.07
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▶Fuel Flow of D27DTP (Power Up) Engine
Fuel Supply System

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RODIUS 2007.07
0000-00
CDEF(Catalytic Disel Particulate Filter)
CDPF (Catalyst & Diesel Particulate Filter) and Sensors
3. MAJOR CHANGES
The CDPF system is only installed to the D27DT engine, and the major changes comparing to
the previous D27DT engine is as follows:
Engine ECUFuel Common Rail and Fuel Rail
(Between Common Rail and Injector)
The I.D and O.D of fuel rail has changed
from 2.4 mm/6.0 mm to 3.0 mm/6.35 mm.
Also, the damping orifice is installed to
prevent the fuel pulsation occured by fuel
pressure.
The engine ECU has been revised since
terminals have been added for front/rear
temperature sensors.
Its version is 3.2, but it is not compatible
with ECU without CDPF.

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RODIUS 2007.07
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CDEF(Catalytic Disel Particulate Filter)
4. OPERATION PROCESS
1) Combustion Temperature and Procedures
As the soot is filtered in the CDPF, it is burnt and removed, and the CDPF is returned to the
initial state to collect the soot. Therefore, the burning procedures in the CDPF can be called as
recycling.
The CDPF assembly is integrated with DOC (at front side) and DPF (at rear side).
The DPF burns the soot with high-temperature exhaust gas (over 600°C). The rear
exhaust gas temperature sensor monitors the temperature of DPF section. If this temperature is
below the regeneration temperature, the ECU increases the post injection period to increase
the fuel injection amount, and consequently to increase the exhaust gas temperature.
Normally, when the vehicle is driven for 600 ~ 1,200 km, the enough amount of soot to be
burnt is filtered and accumulated in the CDPF. The ECU increase the amount of post
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9a0047009c00970047009b00960047005d0057005700b6006a> so that the soot is
burnt. The soot is burnt for 15 ~ 20 minutes.

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CDEF(Catalytic Disel Particulate Filter)
RODIUS 2007.07
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2) Sytem Composition for Soot Combustion
When the engine is running in low load range, the temperature of exhaust gas is decreased as
the amount of fuel supplied is decreased. To burnt the soot filtered in the CDPF, the control
system should be installed to check the operating range and increase the temperature o
f
exhaust gas by controlling the amount of fuel supplied and and intake air.
Two temperature sensors and one differential pressure sensor monitor the CDPF's operating
range. According to theses sensors' information, the throttle flap decreases the intake ai
r
entered to the throttle body. Also, the fuel injection pattern is added to increase the temperature
of exhaust gas for soot combustion.
There are two fuel injection patterns (pilot injection and main injection). As the CDPF is
installed, the post injection pattern is added.
3) Post Injection and Air Mass Control
When the differential pressure sensor detects the pressure difference between the front and the
rear side of CDPF, the sensor sends signal indicating the soot is acumulated and the post
injection is performed to raise the temperature of exhaust gas. The amount of fuel injected is
determined according to the temperature of exhaust gas detected by the rear temperature
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9c0095009b00470096008d0047008d009c008c009300470090>njected is increased to
<009900880090009a008c0047009b008f008c0047009b008c00940097008c00990088009b009c0099008c005500470070008d0047009b008f008c0047009b008c00940097008c00990088009b009c0099008c00470090009a00470096009d008c0099004700
5d0057005700b6006a00530047009b008f008c004700880094>ount of fuel injected is
decreased or not controlled.
When the engine is running in low load range, the amount of post injection and the amount of
intake air are controlled.
It is to raise the temperature by increasing the amount of fuel while decreasing the amount of
intake air.