| 摘要 |
In regeneration control of an exhaust gas purification system (1) equipped with NOx occlusion reduction catalyst (11), a decision is made whether operating state of an engine is in a first engine operating range where the exhaust gas temperature is lower than a predetermined mode judgment temperature. If yes, EGR rich control is performed. Otherwise, injection rich control in exhaust pipe is performed. When EGR rich control is performed, a decision is made whether a vehicle is under acceleration or not. If a decision is made that the vehicle is under acceleration, regeneration control is postponed until that decision ends. This enables rich control for regeneration the NOx occlusion reduction catalyst (11), while avoiding deterioration in drivability (comfortableness) during acceleration of the vehicle. |
