2012 SSANGYONG RODIUS Service Manual

14-112412-02
1) Oxidation of DOC
The DOC oxidizes HC and CO of the exhaust gas in the two-way catalytic converter at 180℃ or
<009400960099008c0053004700880095008b00470097008c0099008d009600990094009a00470089008c009a009b00470088009b0047009b008f008c0047009b008c00940097008c00990088009b009c0099008c00470089008c009b009e008c008c009500
47005b00570057004700880095008b0047005c005700570b45>. The front EGT sensor
detects whether the DOC can burn (oxidize) the post-injected fuel or not, and sends the signal to
<009b008f008c0047006c006a007c0047009b009600470094008800900095009b0088009000950047009b008f008c0047006b0076006a004700960097008c00990088009b00900095008e0047009b008c00940097008c00990088009b009c0099008c004700
89008c009b009e008c008c00950047005a0057005700470088>nd 500℃. The DOC reduces
CO and HC of the exhaust gas by redox reaction and also reduces small amount of PM.
<0076009f00a0008e008c009500470088008b008f008c0099008c009a0047009b00960047009b008f008c0047008a0088009b0088009300a0009a009b004700940088009b008c0099009000880093009a006100470073008c009a009a0047009b008f008800
9500470058005f00570b45> 1.
<006a0076004700880095008b0047006f006a004700880099008c00470096009f0090008b009000a1008c008b0047008900a00047009b008f008c0047008a0088009b0088009300a0009a009b004700940088009b008c0099009000880093009a0061004700
7400960099008c0047009b008f0088009500470058005f0057>℃ 2.

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2) Collecting PM of DPF
There is a filter installed in the DPF and the PM filtered by this filter is burned (regeneration) when
the temperature of exhaust gas is increased due to post-injection. The filter has a honeycomb-
like structure to capture the particulate matter and the inlet and outlet of each channel are closed
alternatively. Once the exhaust gas enters to the inlet of a channel, it is released from the outlet of
the adjacent channel through the porous wall because of the closed outlet of the first channel,
and the PM is collected in the first channel.
[Collecting PM of CDPF]
Normally, when the driving distance becomes approx. 600 to 1,200 km, enough amount of
soot to be burned is filtered and accumulated in the CDPF. The ECU increases the amount of
fuel post-injection to increase the temperature of the exhaust gas up to 600°C, so that the
soot is burned. The soot is burned for 15 to 20 minutes (may differ by conditions).

14-132412-02
3) PM Regeneration of DPF
The differential pressure sensor installed in the DPF measures the pressure values of inlet and
outlet of CDPF. And the amount of the PM collected in the filter is calculated based on the exhaust
temperature, intake air mass flow, booster pressure, etc.
The regeneration is started when the amount of the collected PM is 28 g or more.
<007b008f008c0047006c006a007c0047008a00960094009400880095008b009a004700970096009a009b0054009000950091008c008a009b0090009600950047009b0096004700900095008a0099008c0088009a008c0047009b008f008c0047009b008c00
940097008c00990088009b009c0099008c00470096008d0047>CDPF to 600℃.
When the amount of the collected PM is not enough: The DPF works as a filter. 1.
When enough amount of PM is collected: The ECU commands post-injection and increase the
exhaust gas temperature to start regeneration. 2.

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4) Fuel Injection During CDPF Regeneration
The injection method in D20DTR engine has three steps;
Pilot injection, Main injection, Post injection
Post injection ▶
<007b008f008c004700970096009a009b0047009000950091008c008a009b00900096009500470090009a0047009b008f008c0047009000950091008c008a009b0090009600950047009700990096008a008c009a009a00470088008d009b008c0099004700
940088009000950047009000950091008c008a009b00900096>n and consists of ‘After injection”,
“Post 1 injection” and “Post 2 injection”. All of post injections are to reduce the PM and harmful
exhaust gas. The post injection does not make the actual output. The post injection activates the
fuel by injecting the fuel to the incompletely combusted gas after primary combustion. Through
the process, the PM and smoke in the exhaust gas could be reduced. There are totally 7
injections as shown in the figure. However, all of 7 injections are not performed during driving
because it decreases the fuel economy. Totally 5 injections can be performed in one cycle.

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6. CIRCUIT DIAGRAM

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7. CAUTIONS
1) Designated Engine Oil for CDPF (Low Ash Oil)
Need to use the designated engine oil for CDPF 1.
The smoke from the vehicle may generate the particle material in the ambient air. CDPF is
the device to reduce the smoke by collecting and recycling it. To ensure the performance
of CDPF, the designated engine oil should be used.
The smoke including combusted sulfur in fuel cannot be recycled in CDPF. This smoke
generates the ash, resulting in clogging the filter. -
-
Advantages when using the designated engine oil for CDPF 2.
Reduces the amount of ash
Improves the fuel economy and reduces the CO2
Increases the life span of engine oil
Available for all engines (diesel and gasoline) -
-
-
-
Problems when using non-designated engine oil for CDPF 3.
Decreases the life span of engine oil due to accumulated ash in DPF (around 30%)
Decreases the fuel economy due to friction resistance, exhaust gas resistance and
frequent recycling process of DPF -
-
The fuel containing high sulfur may cause the same problems.

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2) Do Not Use the Fuel Containing High Sulfur
Producing white smoke during recycling 1.
The sulfur in exhaust gas is changed to sulfate gas during exhaust process. This sulfate
gas is shown as white smoke. -
Producing odor during recycling 2.
The sulfur after oxidation may produce the odor. -
Accumulation of ash 3.
The sulfur accumulated in DPF cannot be recycled. It reduces the life span of DPF. -
3) White Smoke
The white smoke can be generated when the exhaust gas is recycled in DPF. There are two
reasons as below.
Saturated vapor 1.
Sulfate 2.
The vehicle equipped with CDPF system may generate the white smoke when using the fuel
with high sulfur content (over 100 ppm). This is caused by the sulfur attached and
accumulated in CDPF. However, this is very natural situation, not caused by your vehicle.
How to fix the problem
<0079008c009700930088008a008c0047008a009c00990099008c0095009b0047008d009c008c00930047009e0090009b008f0047008f0090008e008f0047008e00990088008b008c0047008d009c008c009300470088009a0047009a009600960095004700
88009a004700970096009a009a009000890093008c00550047>How­ever, even after
replacing the fuel, the white smoke may be seen due to residual sulfur in CDPF system. -
-

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1. ENGINE DATA LIST
Data Unit Value
Coolant temperature℃ 130℃~-40℃
Intake air temperature℃ -40 to 130℃ (varies by ambient air
temperature or engine mode)
Idle speed rpm 700 ± 50 (P/N), 600 ± (D)
Engine load % 18~25%
Mass air flow kg/h 16 to 25 kg/h
Throttle position angle°TA 0° (Full Open) to 78° (Close)
Engine torque Nm varies by engine conditions
Injection time ms 3 to 5ms
Battery voltage V 13.5 V to 14.1 V
Accelerator pedal position 1 V 0.4. to 4.8V
Accelerator pedal position 2 V 0.2 to 2.4 V
Throttle position 1 V 0.3 to 4.6 V
Throttle position 2 V 0.3 to 4.6 V
Oxygen sensor V 0 to 5 V
A/C compressor switch
1=ON / 0=OFF -
Full load 1=ON / 0=OFF -
Gear selection (A/T) 1=ON / 0=OFF -
Knocking control 1=ON / 0=OFF -
Brake switch 1=ON / 0=OFF -
Cruise control 1=ON / 0=OFF -