| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of appropriately increasing DPF temperature by prohibiting feedback control during a period in which a temperature sensor model is estimating an inappropriate value when executing DPF regeneration control using the temperature sensor model.SOLUTION: The exhaust emission control device 10 includes a DOC (oxidation catalyst) 52 and a DPF (particulate filter) 53 in an exhaust passage. The exhaust emission control device executes the feedback control over an amount of energy applied to the DPF (post fuel injection amount) so that an actual temperature of the DPF coincides with a predetermined command temperature, when a regeneration start condition of the DPF 53 is satisfied. In this feedback control, the exhaust emission control device 10 calculates a sensor target detection temperature detected by a temperature sensor 65, 66 while using the temperature sensor model which is constructed using Pade approximation in consideration of "a dead time and a lag". During a predetermined period after the regeneration start condition is satisfied, the feedback control based on the sensor target detection temperature is prohibited. |
