EXHAUST PURIFICATION SYSTEM FOR INTERNAL COMBUSTION ENGINE

摘要

A wall flow type particulate filter is arranged inside the exhaust passage of an internal combustion engine where combustion is performed under an excess of oxygen. The particulate filter carries a solid acid. The solid acid has an acid strength which is higher than the acid strength of sulfurous acid and lower than the acid strength of sulfuric acid. To remove the ash from the particulate filter, ash atomization processing for rendering the state of the particulate filter a state where the exhaust gas which flows into the particulate filter is lowered in concentration of oxygen and the particulate filter is raised in temperature is temporarily performed.

主权项

1. An exhaust purification system for an internal combustion engine in which fuel is burned under an oxygen excess, in which a wall flow type particulate filter for trapping particulate matter in the exhaust gas is arranged inside of an exhaust passage, and in which ash is trapped along with particulate matter by the particulate filter,
the exhaust purification system wherein
the particulate filter carries a solid acid, the solid acid having an acid strength which is higher than the acid strength of sulfurous acid and lower than the acid strength of sulfuric acid, andash atomization processing, which renders the state of the particulate filter a state where the concentration of oxygen in the exhaust gas which flows into the particulate filter is lowered and the temperature of the particulate filter is raised to remove ash from the particulate filter, is temporarily performed.