EXHAUST EMISSION CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To promptly raise a temperature of an NOx occlusion reduction type catalyst.SOLUTION: An exhaust emission control device includes: an NOx occlusion reduction type catalyst 32 provided in an exhaust passage 13 of an engine 10 and reducing NOx included in exhaust gas for purification while having a temperature raised to a predetermined operation temperature; an NOx/lambda sensor 45 provided in the exhaust passage 13 and detecting NOx included in exhaust gas while heated by a heater 45a; a first exhaust temperature sensor 43 for detecting a temperature of exhaust gas flowing in the exhaust passage 13; and a cylinder injector 11 and an ECU 50 for prohibiting heating by the heater 45a and increasing HC included in the exhaust gas to increase a temperature of the NOx occlusion reduction type catalyst 32 when the detected exhaust gas temperature is less than a predetermine threshold value THR1.SELECTED DRAWING: Figure 3