SsangYong Rodius (2013 year). Service manual — part 94
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C. Input/Output for CDPF control
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Rear EGT sensor:
Measure DPF temp
Diff. pres. sensor:
Measure pressure
between front side and
rear side of CDPF
Electronic throttle
body: Control intake
air mass
ECU (DCM 3.7)
Injector: Control post
injection
D. Operation process
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 accumulated 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 sensor. If the
temperature is below 600°C, the amount of fuel injected is increased to raise the temperature. If
the temperature is over 600°C, the amount 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.
Front EGT sensor:
Measure DOC temp
T-MAP sensor
Intake air
mass
Exceed PM
limit
Booster
pressure/
temperature
Post injection
Control intake
air mass
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E. Cautions
Use only specified Engine Oil (approved by MB Sheet 229.51) for CDPF.
-
Use only specified engine oil (Low Ash Oil)
▶
The vehicle equipped with CDPF should use specific engine oil to improve the engine
performance and fuel economy, and ensure the service life of CDPF.
-
Issue with normal engine oil
▶
Sulfur, one of the contents of engine oil is burned and generates soot that is not regenerated by
the DPF. This remains on the filter as ashes and keeps accumulating. Eventually, this ashes will
block the filter.
-
Benefit for specified engine oil
▶
Minimized the sulfur content of engine oil which reduces the service life.
Improved fuel economy and emission level of CO2 with high performance and low viscosity.
Increased service life of engine oil with high resistance to temperature.
-
-
-
Problems when using unspecified engine oil
▶
The service life of filter may be reduced by 30% or more by the ashes accumulated on the filter.
The fuel economy may be reduced because of engine rolling resistance, frequent regeneration of
DPF.
-
-
These problems are also caused by oil with high sulfur content, such as tax exemption oil and
heating oil, etc.
*
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3) Input/Output for CAN communication
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