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: a diesel particulate filter 115 collecting particulate matter in exhaust gas; an EGR valve 107 controlling the amount of exhaust gas returned from an exhaust manifold 102 to an intake manifold 104; an EGR control unit 173 controlling opening of the EGR valve 107 on the basis of an engine rotation speed and a fuel injection amount; and an acceleration EGR valve control unit 176 controlling the EGR valve 107 to be fully closed for a prescribed period of time when the vehicle is suddenly accelerated during the DPF regeneration.

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