Apparatus and method for controlling regeneration in exhaust emission control device

Abstract

A method and an apparatus for controlling regeneration of an exhaust emission control device in which a diesel particulate filter (DPF) may be installed at a back stage of a reducing agent supply apparatus may include measuring temperature of a front stage of the DPF at the time of supplying a reducing agent, comparing a temperature value measured at the front stage of the DPF with a temperature modeling value of the front stage of the DPF, and controlling the regeneration of the DPF by comparing a difference between the temperature value and the temperature modeling value with a reference variation.

What is claimed is: 
     
         1 . A method for controlling regeneration of an exhaust emission control device in which a diesel particulate filter (DPF) is installed at a back stage of a reducing agent supply apparatus, the method comprising:
 measuring temperature of a front stage of the DPF at a time of supplying a reducing agent by the reducing agent supply apparatus while regenerating the DPF;   comparing a temperature value measured at the front stage of the DPF with a temperature modeling value of the front stage of the DPF depending on the regeneration of the DPF based on a map showing a relationship between the temperature value and the temperature modeling value; and   controlling the regeneration of the DPF by comparing a difference between the temperature value and the temperature modeling value with a reference variation and selecting the temperature value or the temperature modeling value as the temperature of the front stage of the DPF depending on the difference.   
     
     
         2 . The method of  claim 1 , wherein in the controlling of the regeneration, when the difference between the temperature value and the temperature modeling value exceeds the reference variation, the DPF is regenerated based on the temperature modeling value. 
     
     
         3 . The method of  claim 1 , wherein in the controlling of the regeneration, when the difference between the temperature value and the temperature modeling value is equal to or less than the reference variation, the DPF is regenerated based on the temperature value. 
     
     
         4 . The method of  claim 1 , wherein the DPF is coated with a selective catalytic reduction (SCR) catalyst. 
     
     
         5 . The method of  claim 1 , wherein the front stage of the DPF is provided with a temperature sensor to measure the temperature of the front stage of the DPF. 
     
     
         6 . An apparatus for controlling regeneration of an exhaust emission control device, comprising:
 a temperature sensor configured to measure a temperature of a front stage of a diesel particulate filter (DPF); and   a control unit configured to compare a temperature value measured at the front stage of the DPF with a temperature modeling value of the front stage of the DPF depending on an active regeneration of the DPF based on a map showing a relationship between the temperature value and the temperature modeling value and to control regeneration of the DPF by comparing a difference between the temperature value and the temperature modeling value with a reference variation at a time of supplying the reducing agent by a reducing agent supply apparatus while actively regenerating the DPF to select the temperature value or the temperature modeling value as the temperature of the front stage of the DPF depending on the difference.   
     
     
         7 . The apparatus of  claim 6 , wherein in controlling of the regeneration, when the difference between the temperature value and the temperature modeling value exceeds the reference variation, the DPF is regenerated based on the temperature modeling value. 
     
     
         8 . The apparatus of  claim 6 , wherein in controlling of the regeneration, when the difference between the temperature value and the temperature modeling value is equal to or less than the reference variation, the DPF is regenerated based on the temperature value. 
     
     
         9 . The apparatus of  claim 6 , wherein the DPF is coated with a selective catalytic reduction (SCR) catalyst.