Method and system of maintaining dpf regeneration for improving durability of dpf filter

Abstract

A method of maintaining diesel particulate filter (DPF) regeneration for improving durability of a DPF, may include determining, by a controller, whether a vehicle enters an idle state during the DPF regeneration, controlling, by the controller, a concentration of oxygen introduced into the DPF to be equal to or less than a first reference value when the vehicle enters the idle state, and performing, by the controller, a regeneration process until a soot mass in the DPF may be equal to or less than a target reference value.

1 . A method of maintaining diesel particulate filter (DPF) regeneration for improving durability of a DPF, comprising:
 determining, by a controller, whether a vehicle enters an idle state during the DPF regeneration;   controlling, by the controller, a concentration of oxygen introduced into the DPF to be equal to or less than a first reference value when the vehicle enters the idle state; and   performing, by the controller, a regeneration process until a soot mass in the DPF is equal to or less than a target reference value.   
     
     
         2 . The method of  claim 1 , further comprising:
 after the determining whether the vehicle enters the idle state during the DPF generation, comparing, by the controller, the soot mass in the DPF with a preset soot reference value when the vehicle enters the idle state.   
     
     
         3 . The method of  claim 2 , further comprising:
 in the comparing of the soot mass in the DPF with the preset soot reference value when the vehicle enters the idle state, when the soot mass in the DPF is equal to or more than the preset soot reference value, controlling, by the controller, the concentration of the oxygen introduced into the DPF to be equal to or less than the first reference value, and when the soot mass in the DPF is less than the preset soot reference value, controlling, by the controller, the concentration of the oxygen introduced into the DPF to be equal to or less than a second reference value larger than the first reference value.   
     
     
         4 . The method of  claim 3 , wherein the concentration of the oxygen introduced into the DPF is controlled by using a shutoff valve installed in front of an engine. 
     
     
         5 . A system of maintaining DPF regeneration for improving durability of a diesel particulate filter (DPF), comprising:
 the DPF capturing a soot captured in exhaust gas; and   a controller receiving a signal about whether a vehicle is currently in an idle state to maintain the DPF regeneration in the idle state of the vehicle until a soot mass in the DPF reaches a target reference value to prevent the DPF from arriving at a limit temperature and a limit temperature gradient.   
     
     
         6 . The system of  claim 5 , wherein the controller receives the signal about whether the vehicle is currently in the idle state and controls a concentration of oxygen introduced into the DPF to be equal to or less than a first reference value to maintain the DPF regeneration until the soot mass in the DPF reaches the target reference value. 
     
     
         7 . The system of  claim 6 , wherein the controller receives the signal about whether the vehicle is currently in the idle state and then determines whether the soot mass in the DPF is equal to or more than a preset soot reference value. 
     
     
         8 . The system of  claim 7 , wherein the controller controls the concentration of the oxygen introduced into the DPF to be equal to or less than the first reference value when the soot mass in the DPF is equal to or more than the preset soot reference value, and when the soot mass in the DPF is less than the preset soot reference value, controlling, by the controller, the concentration of the oxygen introduced into the DPF to be equal to or less than a second reference value larger than the first reference value to maintain the DPF regeneration until the soot mass in the DPF reaches the target reference value. 
     
     
         9 . The system of  claim 5 , wherein the controller transfers a signal to a shutoff valve installed in front of an engine to control a concentration of oxygen introduced into the DPF.