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The open flow type DPF does not have the DPF regeneration control by the engine-ECU. The
forced regeneration or maintenance, therefore, is not necessary. The two kinds of the exhaust
gas passages are in the DPF. Only one of them has the filter collecting the particulate matter
(PM). The DPF regenerations begins when the inside DPF temperature gets higher depending on
the engine operating conditions. And then the PM collected in the filter is burned. During the
DPF regeneration, the high temperature exhaust gas is emitted as the DPF temperature gets higher.
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