DIESEL PARTICULATE FILTER REGENERATION METHOD OF EXHAUST GAS AFTER TREATMENT DEVICE FOR DIESEL ENGINE

摘要

A DPF regeneration method of an exhaust gas post treatment device is disclosed. The DPF regeneration method of an exhaust gas post treatment device according to the present invention comprises a heating step for raising the DPF front end temperature to a target temperature necessary for regeneration; and a regeneration step of combusting PM (particulate matter) captured in DPF by using the high temperature heat raised to the target temperature through the heating step. The gist of the present invention is that when the DPF front end temperature does not reach the minimum temperature necessary for regeneration during a preset time period in the heating step, a control for reducing the fuel consumption is performed. [Reference numerals] (AA) Start; (BB) Regeneration command output?; (CC) Count time as first heating process starts; (DD) Is inside temperature of device 300°C or more after 5 minutes are elapsed?; (EE) Reduce post spray amount of fuel gadually; (FF) End heating; (GG) Switch to second heating process; (HH) End