Exhaust gas recirculation device

Abstract

An exhaust gas recirculation device for reducing nitrogen oxide in exhausting gas of a motorcycle engine includes an exhaust gas recirculation pipe between an exhausting end and a negative pressure air inlet end of the engine; at least one check valve installed in the exhaust recirculation pipe. A negative pressure control valve is installed between the check valve and the inlet end of the engine. Thereby the negative pressure of the engine is used as a power source so as to guide unidirectionally exhaust gas containing carbon dioxide at the exhausting end to the inlet end of the engine through the check valve and the negative pressure control valve so as to decrease operation temperatures of the engine and as a result, nitrogen oxide in the exhaust gas of the engine is reduced.

1 . An exhaust gas recirculation device for reducing nitrogen oxide in exhausting gas of a motorcycle engine, the device comprising: 
 an exhaust gas recirculation pipe between an exhausting end and a negative pressure air inlet end of the engine;    at least one check valve installed in the exhaust recirculation pipe for guiding unidirectionally exhaust gas containing carbon dioxide at the exhausting end to the inlet end of the engine so as to decrease operation temperatures of the engine and as a result, nitrogen oxide in the exhaust gas of the engine is reduced.    
     
     
         2 . The device as claimed in  claim 1 , wherein the exhausting end is a branch tube at a front section of an exhausting tube of the engine for being connected to the exhaust gas recirculation pipe.  
     
     
         3 . The device as claimed in  claim 2 , wherein the front section is positioned at an exhausting tube between the exhausting opening and a position installed the catalytic converter.  
     
     
         4 . The device as claimed in  claim 1 , wherein the exhausting end is a branch tube connected to an exhausting channel of the cylinder of the engine for being connected to the exhaust gas recirculation pipe.  
     
     
         5 . The device as claimed in  claim 1 , wherein the air inlet end is at an air inlet channel between a carburetor and an air inlet branch tube of the engine for connecting the exhaust gas recirculation pipe.  
     
     
         6 . The device as claimed in  claim 1 , wherein the air inlet end is on a flow adjustor between a carburetor and an air inlet branch tube of the engine for connecting the exhaust gas recirculation pipe.  
     
     
         7 . The device as claimed in  claim 1 , wherein the air inlet end is positioned at an air inlet channel between a throttle valve of an electronic fuel injection system and an air inlet branch tube of the engine.  
     
     
         8 . The device as claimed in  claim 1 , wherein the air inlet end is positioned at a flow adjustor between a throttle valve of an electronic fuel injection system and an air inlet branch tube of the engine.  
     
     
         9 . The device as claimed in  claim 1 , wherein the check valve is installed on the exhaust gas recirculation pipe near the exhausting end for controlling the exhausting gas of the exhausting end to flow into the air inlet end unidirectionally.  
     
     
         10 . The device as claimed in  claim 1 , wherein a negative pressure control valve is installed on the exhaust gas recirculation pipe between the check valve and the air inlet end for controlling an exhausting gas flow path of the exhaust gas recirculation pipe.  
     
     
         11 . The device as claimed in  claim 10 , wherein the negative pressure control valve has a negative pressure tube which is connected to an air inlet end of a throttle valve of a carburetor for capture the dynamic energy of the negative pressure.  
     
     
         12 . The device as claimed in  claim 10 , wherein the negative pressure control valve has a negative pressure tube which is connected to an air inlet end of a throttle valve of an electronic fuel injection system for capture the dynamic energy of the negative pressure.