EXHAUST EMISSION CONTROL SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control system capable of suppressing degradation of exhaust gas during DPF regeneration and obtaining sufficient acceleration performance without generating white smoke or black smoke even when a vehicle is accelerated during the DPF regeneration.

SOLUTION: The exhaust emission control system includes: an EGR control unit 173 controlling opening of an EGR valve 107 on the basis of an engine rotation speed and a fuel injection amount; a boost pressure sensor 155 detecting a boost pressure; a target boost pressure calculation unit 176 obtaining a target boost pressure on the basis of the engine rotation speed and the fuel injection amount; and an EGR valve opening correction unit 177 correcting the opening of the EGR valve 107 on the basis of a difference between the target boost pressure obtained by the target boost pressure calculation unit 176 and the boost pressure detected by the boost pressure sensor 155.

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