SSANGYONG KYRON 2010.01 Manual page 165

05-8
1881-09
2) System 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 burn the soot filtered in the CDPF, the control
system should be installed to check the operating range and increase the temperature of
exhaust gas by controlling the amount of fuel supplied and intake air.
Two temperature sensors and one differential pressure sensor monitor the CDPF's operating
range. According to these sensors' information, the throttle flap decreases the intake air
entered to the throttle body. Also, the fuel injection pattern is added to increase the temperature
of exhaust gas for soot combustion.
There are three fuel injection patterns (pilot injection, pre-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
sensor. If the temperature is below 600°C,
raise the temperature. If the temperature is over 600°C,
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.
CDPF
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the amount of fuel injected is increased to
the amount of fuel injected is