SSANGYONG Korando 2012 Manual page 295

14-10
4. POST-INJECTION AND AIR MASS CONTROL
A DPS (Differential Pressure Sensor) measures the pressure difference between before and after
the CDPF and detects whether the soot is collected in the CDPF or not. If PM is collected in the
CDPF (In this case the pressure difference between before and after the CDPF exceeds the
specified value. Normally, the system sends the signal when the driving distance becomes
approx. 600 to 1,200 km), the temperature of exhaust gas is increased and the post-injection is
started for regeneration. The amount of fuel post-injection is controlled by the exhaust gas
temperature measured by the rear temperature sensor. If the temperature is less than 600℃, the
amount of post-injection is increased to increase the regeneration temperature. Otherwise, the
fuel injection amount is decreased or the fuel is not injected.
When the engine is running with low load, the intake air amount is also controlled as well as fuel
injection amount. This function is used to increaser the combustion temperature by increasing the
amount of fuel post-injection with the lowest air amount within the specified control logic.