Abstract: Provided are an exhaust purification device and an exhaust purification method which can achieve improved fuel efficiency. The exhaust purification device (100) is equipped with: a DOC (5) for occluding hydrocarbons in an exhaust gas; a DPF (6) that is provided downstream from the DOC (5) and is for trapping particulate matter in the exhaust gas; and an ECU (10) for determining, in accordance with the amount of occluded hydrocarbons in the DOC (5), a start time for a regeneration process for removing particulate matter accumulated in the DPF (6).

Abstract: Provided are an exhaust purification device and an exhaust purification method which can achieve improved fuel efficiency. The exhaust purification device (100) is equipped with: a DOC (5) for occluding hydrocarbons in an exhaust gas; a DPF (6) that is provided downstream from the DOC (5) and is for trapping particulate matter in the exhaust gas; and an ECU (10) for determining, in accordance with the amount of occluded hydrocarbons in the DOC (5), a start time for a regeneration process for removing particulate matter accumulated in the DPF (6).

Abstract: An exhaust gas purification system with which diesel particulate filter (“DPF”) regeneration can be continued even when deceleration occurs during the DPF regeneration. The system includes a regeneration deceleration period intake/exhaust control unit that, when a vehicle decelerates during the DPF regeneration, increases an exhaust gas flow rate through an exhaust pipe by controlling respective openings of an exhaust gas recirculation (“EGR”) device and an intake throttle and adjusting a turbocharging amount of a high pressure stage turbocharger.

Abstract: When a diesel particulate diffuser (“DPD”) of a vehicle traveling in a normal drive mode in the upland area is to be automatically regenerated by raising a temperature of exhaust gas from an engine, an exhaust gas purification system determines an upland full-load injection quantity from the atmospheric pressure in the upland area and an engine speed while the vehicle is in motion and drives the vehicle with the injection quantity determined. The system determines, during the regeneration mode, an upland drive regeneration injection quantity obtained by decreasing the upland full-load injection quantity on the basis of a quantity required for the post-injection. The injection quantity is gradually decreased from the upland full-load injection quantity to the upland regeneration drive injection quantity when the vehicle shifts from the normal drive mode in the upland area to the upland regeneration mode, so that the decreased quantity is used for the post-injection.

Abstract: An exhaust gas purification system with which diesel particulate filter (“DPF”) regeneration can be continued even when deceleration occurs during the DPF regeneration. The system includes a regeneration deceleration period intake/exhaust control unit that, when a vehicle decelerates during the DPF regeneration, increases an exhaust gas flow rate through an exhaust pipe by controlling respective openings of an exhaust gas recirculation (“EGR”) device and an intake throttle and adjusting a turbocharging amount of a high pressure stage turbocharger.

Abstract: When a diesel particulate diffuser (“DPD”) of a vehicle traveling in a normal drive mode in the upland area is to be automatically regenerated by raising a temperature of exhaust gas from an engine, an exhaust gas purification system determines an upland full-load injection quantity from the atmospheric pressure in the upland area and an engine speed while the vehicle is in motion and drives the vehicle with the injection quantity determined. The system determines, during the regeneration mode, an upland drive regeneration injection quantity obtained by decreasing the upland full-load injection quantity on the basis of a quantity required for the post-injection. The injection quantity is gradually decreased from the upland full-load injection quantity to the upland regeneration drive injection quantity when the vehicle shifts from the normal drive mode in the upland area to the upland regeneration mode, so that the decreased quantity is used for the post-injection.