SSANGYONG Rodius 2012.07 Manual page 324

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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
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Post injection
The post injection is the injection process after main injection 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.