| 摘要 |
An object is to prevent excessive temperature rise in a DPF during forced regeneration so that the DPF is prevented from being damaged by heat erosion or cracking and preventing a frequency of the forced regeneration from increasing so that degradation of fuel efficiency and oil dilution are reduced, in an exhaust gas purification device which removes PM in exhaust gas. A first determination unit (67) which determines whether an exhaust gas flowrate is smaller than a first threshold and is equal to or larger than a second threshold smaller than the first threshold, during forced regeneration processing by a forced regeneration control unit (65); an exhaust gas increasing control unit (69) which controls the intake throttle valve in such a manner that the exhaust gas flowrate is increased when the first determination unit (67) determines that the exhaust gas flowrate is smaller than the first threshold and is equal to or larger than the second threshold; a second determination unit (71) which determines an operation state of the exhaust gas flowrate smaller than the second threshold; and a forced regeneration interrupting unit (73) which interrupts the forced regeneration processing when the second determination unit (71) determines that the exhaust gas flowrate is smaller than the second threshold, are provided. |
