Method for Controlling Injection Amount of Fuel of Burner and Aftertreating Device of Exhaust Gas

Abstract

Disclosed is a method for controlling an injection amount of fuel of a burner and an aftertreating device of exhaust gas, and more particularly, to a method for controlling an injection amount of fuel of a burner and an aftertreating device of exhaust gas, in which the burner is controlled in consideration of exothermic effect due to a catalytic filter, thereby stably reducing exhaust gas.

1 . An aftertreating device of exhaust gas, comprising:
 a burner disposed at a vent pipe in which the exhaust gas generated from a diesel engine is flowed and having a fuel injecting part and an igniting means for increasing temperature of the exhaust gas;   a diesel particulate filter (DPF) which is disposed at a rear side of the burner in a flow direction of the exhaust gas so as to burn organic materials or particulate matters (PM) contained in the exhaust gas;   a temperature sensor for measuring the temperature of the exhaust gas; and   a controlling part which controls a fuel injection amount of the fuel injecting part using an engine displacement estimated through the temperature measured from the temperature sensor.   
     
     
         2 . The aftertreating device of  claim 1 , wherein the controlling part estimates the engine displacement by further using RPM information of the diesel engine. 
     
     
         3 . The aftertreating device of  claim 1 , wherein the temperature sensor is disposed at a rear side of the DPF in the flow direction of the exhaust gas. 
     
     
         4 . The aftertreating device of  claim 1 , further comprising a pro-catalyst disposed between the burner and the DPF,
 wherein the temperature sensor is disposed between the pro-catalyst and the DPF or at a rear side of the DPF in the flow direction of the exhaust gas.   
     
     
         5 . A method for controlling an injection amount of fuel of a burner in the aftertreating device of  claim 1 . 
     
     
         6 . The method of  claim 5 , wherein the controlling part controls the fuel injection amount so that an amount of hydrocarbon compound is 1˜3000 ppm at the rear side of the burner in the flow direction of the exhaust gas. 
     
     
         7 . The method of  claim 6 , wherein the controlling part controls the fuel injection amount to be  0 .001˜0.02 g for 1 minute per 1 l of an exhaust emission rate calculated by an equation 1 as follows:
   [Equation 1] 
   Exhaust emission rate ( E )= a ·engine displacement·RPM
 
 (a=a constant of a load factor). 
 
     
     
         8 . A method for controlling an injection amount of fuel of a burner in the aftertreating device of  claim 2 . 
     
     
         9 . A method for controlling an injection amount of fuel of a burner in the aftertreating device of  claim 3 . 
     
     
         10 . A method for controlling an injection amount of fuel of a burner in the aftertreating device of  claim 4 . 
     
     
         11 . The method of  claim 8 , wherein the controlling part controls the fuel injection amount so that an amount of hydrocarbon compound is 1˜3000 ppm at the rear side of the burner in the flow direction of the exhaust gas. 
     
     
         12 . The method of  claim 9 , wherein the controlling part controls the fuel injection amount so that an amount of hydrocarbon compound is 1˜3000 ppm at the rear side of the burner in the flow direction of the exhaust gas. 
     
     
         13 . The method of  claim 10 , wherein the controlling part controls the fuel injection amount so that an amount of hydrocarbon compound is 1˜3000 ppm at the rear side of the burner in the flow direction of the exhaust gas. 
     
     
         14 . The method of  claim 11 , wherein the controlling part controls the fuel injection amount to be 0.001˜0.02 g for 1 minute per 1 l of an exhaust emission rate calculated by an equation 1 as follows:
   [Equation 1] 
   Exhaust emission rate ( E )= a ·engine displacement·RPM
 
 (a=a constant of a load factor). 
 
     
     
         15 . The method of  claim 12 , wherein the controlling part controls the fuel injection amount to be 0.001˜0.02 g for 1 minute per 1 l of an exhaust emission rate calculated by an equation 1 as follows:
   [Equation 1] 
   Exhaust emission rate ( E )= a ·engine displacement·RPM
 
 (a=a constant of a load factor). 
 
     
     
         16 . The method of  claim 13 , wherein the controlling part controls the fuel injection amount to be 0.001˜0.02 g for 1 minute per 1 l of an exhaust emission rate calculated by an equation 1 as follows:
   [Equation 1] 
   Exhaust emission rate ( E )= a ·engine displacement·RPM
 
 (a=a constant of a load factor).