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14-15 2412-02 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- burned. The soot is burned for 15 to 20 minutes (may differ by conditions). |