| 摘要 |
<p>There is provided a DPF system capable of performing the DPF regeneration with a suitable exhaust injection amount even when the change in injection amount occurs due to a manufacturing variation or an aged deterioration of an exhaust pipe injector. The DPF system 10 is provided with temperature sensors 26 and 27 provided at an entrance side and an exit side of a DOC 23 to detect a DOC entrance temperature and a DOC exit temperature during a DPF forcible regeneration, a SV ratio determining means 29 that determines an exhaust gas SV ratio by measuring flow rate of exhaust gas during the DPF forcible regeneration, and an injector diagnosing means 30 including a heat-generation region determining unit 31 to which detection values of the temperature sensors 26 and 27 and a determination value of the SV ratio determining means 29 are input to determine whether or not these values are within a theoretical heat-generation region and an actual injection amount diagnosing unit 32 that diagnoses a decrease amount in an actual injection amount of an exhaust pipe injector 24 when the detection values of the temperature sensors 26 and 27 and the determination value of the SV ratio determining means 29 are within the theoretical heat-generation region.</p> |
