Patent ID: 8984869
Filing Date: 2015-03-24
Classification: F01N,F02D,Y02T

Abstract:
1. An exhaust gas emission control system for a diesel engine as an internal combustion engine, comprising, in an exhaust passage, an oxidation catalyst (DOC) and a diesel particulate filter (DPF) for collecting soot in exhaust gas so that the soot collected by the DPF is regenerated, the exhaust gas emission control system further comprising: an electronic control unit; and a memory storing instructions that, when executed by the electronic control unit, cause the exhaust gas emission control system to: wherein the target soot regeneration amount per unit time is varied according to a regeneration elapsed time after the start of late post-injection, such that the target soot regeneration amount per unit time is set to a small value directly after the start of regeneration, then the set value is increased as the regeneration progresses, and the target soot regeneration amount per unit time is set to a small value again at the end of the regeneration.