| 摘要 |
A DPF is used in an internal combustion engine for trapping PM discharged from an engine body. Presence and absence of an abnormality in the DPF is evaluated using differential pressure, which is between the front and the rear of the DPF. The differential pressure considerably decreases or considerably increases due to breakage or plugging of the DPF in an exhaust emission control device. The abnormality in the DPF is evaluated when a large deviation arises between a PM amount calculated in accordance with differential pressure, which is between the front and the rear of the DPF, and a PM amount calculated through integration of a PM discharge amount measured in accordance with an engine operating state. Thereby, presence and absence of the abnormality such as plugging and breakage in the DPF can be correctly detected.
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