Patent ID: 8316637
Filing Date: 2012-11-27
Classification: B01D,F01N,F02D,Y02T

Abstract:
1. An exhaust emission purification method for an exhaust emission purification system in an internal combustion engine mounted on a vehicle, the system being provided with an exhaust gas purification device having a diesel particulate filter in an exhaust gas passage of the engine, comprising: detecting that ordinary forced regeneration of the exhaust gas purification device is required and, when oil dilution does not occur, performing automatic regeneration; detecting that emergency regeneration of the exhaust gas purification device is required; issuing an alarm urging manual regeneration when the emergency regeneration is required, wherein the alarm includes turning on or flashing of an alarm lamp, and wherein the emergency regeneration is required when any one of a judgment that purification of the diesel particulate filter is insufficient after ending the forced regeneration, the forced regeneration has stopped before completion of the forced regeneration, or a pressure difference across the diesel particulate filter exceeds a predetermined first judging pressure difference when a traveling distance of the vehicle is shorter than a predetermined distance; performing the manual regeneration, when the manual regeneration is designated by a user of the vehicle; or performing automatic regeneration when predetermined conditions are satisfied without the designation of the manual regeneration, wherein the predetermined conditions are any one of the automatic regeneration being designated by the vehicle's user, a predetermined time expiring after issuing the alarm, and the pressure difference across the diesel particulate filter exceeding a predetermined second judging pressure difference, and wherein the emergency regeneration is in addition to the ordinary forced regeneration.