System for Injecting Fuel into Diesel Engine Exhaust Pipe

Abstract

Disclosed is a system for injecting fuel into a diesel engine exhaust pipe that prevents injected fuel from adhering to an exhaust pipe inner wall, adequately reduces and regenerates an exhaust gas purification catalyst, and remarkably increases fuel efficiency. This system includes a plurality of fuel injection nozzles, which are positioned in an exhaust pipe 10 of a diesel engine 1, injects fuel from the fuel injection nozzles, and reduces and regenerates the exhaust gas purification catalyst 11 that is installed in the exhaust pipe. The fuel injection nozzles are positioned so that injection axis lines 20 a intersect with each other. It is preferred that the fuel injection nozzles be arranged in a circumferential direction of the exhaust pipe and positioned at substantially equal spacing intervals, and that the injection axis lines intersect at substantially one point. It is also preferred that the fuel injection nozzles be holed or slit fuel injection nozzles having one or two injection holes.

1 - 7 . (canceled)  
   
   
       8 . A system for injecting fuel into a diesel engine exhaust pipe comprising a plurality of fuel injection nozzles ( 20 , 36 , 38 ) positioned in an exhaust pipe ( 10 ) of a diesel engine ( 1 ) for injecting fuel into the exhaust pipe to reduce and regenerate an exhaust gas purification catalyst ( 11 ) installed in the exhaust pipe, wherein the fuel injection nozzles are positioned so that injection axis lines ( 20   a ) of the injected fuel intersect with each other.  
   
   
       9 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 8 , wherein the plurality of fuel injection nozzles ( 20 , 36 , 38 ) are arranged in a circumferential direction of the exhaust pipe ( 10 ) and positioned at substantially equal spaced intervals from one another.  
   
   
       10 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 8  wherein the plurality of fuel injection nozzles ( 20 , 36 , 38 ) are positioned so that the injection axis lines ( 20   a ) intersect at substantially one point.  
   
   
       11 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 9  wherein the plurality of fuel injection nozzles ( 20 , 36 , 38 ) are positioned so that the injection axis lines ( 20   a ) intersect at substantially one point.  
   
   
       12 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 8 , wherein the fuel injection nozzles are holed fuel injection nozzles ( 20 , 36 ) or slit fuel injection nozzles ( 38 ) having one or two injection holes ( 25 , 37 , 39 ).  
   
   
       13 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 9 , wherein the fuel injection nozzles are holed fuel injection nozzles ( 20 , 36 ) or slit fuel injection nozzles ( 38 ) having one or two injection holes ( 25 , 37 , 39 ).  
   
   
       14 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 10 , wherein the fuel injection nozzles are holed fuel injection nozzles ( 20 , 36 ) or slit fuel injection nozzles ( 38 ) having one or two injection holes ( 25 , 37 , 39 ).  
   
   
       15 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 11 , wherein the fuel injection nozzles ( 20 , 36 , 38 ) are formed so that the injection axis lines ( 20   a ) are inclined rearward from a nozzle main body center line ( 21   a ).  
   
   
       16 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 12 , wherein the fuel injection nozzles ( 20 , 36 , 38 ) are formed so that the injection axis lines ( 20   a ) are inclined rearward from a nozzle main body center line ( 21   a ).  
   
   
       17 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 13 , wherein the fuel injection nozzles ( 20 , 36 , 38 ) are formed so that the injection axis lines ( 20   a ) are inclined rearward from a nozzle main body center line ( 21   a ).  
   
   
       18 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 14 , wherein the fuel injection nozzles ( 20 , 36 , 38 ) are formed so that the injection axis lines ( 20   a ) are inclined rearward from a nozzle main body center line ( 21   a ).  
   
   
       19 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 8  wherein the diesel engine ( 1 ) has a feed pump ( 4 ) for supplying fuel to the fuel injection nozzles ( 20 , 36 , 38 ).  
   
   
       20 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 9  wherein the diesel engine ( 1 ) has a feed pump ( 4 ) for supplying fuel to the fuel injection nozzles ( 20 , 36 , 38 ).  
   
   
       21 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 10  wherein the diesel engine ( 1 ) has a feed pump ( 4 ) for supplying fuel to the fuel injection nozzles ( 20 , 36 , 38 ).  
   
   
       22 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 11  wherein the diesel engine ( 1 ) has a feed pump ( 4 ) for supplying fuel to the fuel injection nozzles ( 20 , 36 , 38 ).  
   
   
       23 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 12  wherein the diesel engine ( 1 ) has a feed pump ( 4 ) for supplying fuel to the fuel injection nozzles ( 20 , 36 , 38 ).  
   
   
       24 . The system for injecting fuel imnto a diesel engine exhaust pipe according to  claim 13  wherein the diesel engine ( 1 ) has a feed pump ( 4 ) for supplying fuel to the fuel injection nozzles ( 20 , 36 , 38 ).  
   
   
       25 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 14  wherein the diesel engine ( 1 ) has a feed pump ( 4 ) for supplying fuel to the fuel injection nozzles ( 20 , 36 , 38 ).  
   
   
       26 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 15  wherein the diesel engine ( 1 ) has a feed pump ( 4 ) for supplying fuel to the fuel injection nozzles ( 20 , 36 , 38 ).  
   
   
       27 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 16  wherein the diesel engine ( 1 ) has a feed pump ( 4 ) for supplying fuel to the fuel injection nozzles ( 20 , 36 , 38 ).  
   
   
       28 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 17  wherein the diesel engine ( 1 ) has a feed pump ( 4 ) for supplying fuel to the fuel injection nozzles ( 20 , 36 , 38 ).  
   
   
       29 . The system for injecting fuel into a diesel engine exhaust pipe according to  claim 18  wherein the diesel engine ( 1 ) has a feed pump ( 4 ) for supplying fuel to the fuel injection nozzles ( 20 , 36 , 38 ).