<P> In internal combustion engines , exhaust gas recirculation ( EGR ) is a nitrogen oxide ( NO ) emissions reduction technique used in petrol / gasoline and diesel engines . EGR works by recirculating a portion of an engine 's exhaust gas back to the engine cylinders . This dilutes the O in the incoming air stream and provides gases inert to combustion to act as absorbents of combustion heat to reduce peak in - cylinder temperatures . NO is produced in high temperature mixtures of atmospheric nitrogen and oxygen that occur in the combustion cylinder , and this usually occurs at cylinder peak pressure . Another primary benefit of external EGR valves on a spark ignition engine is an increase in efficiency , as charge dilution allows a larger throttle position and reduces associated pumping losses . </P>
<P> In internal combustion engines , exhaust gas recirculation ( EGR ) is a nitrogen oxide ( NO ) emissions reduction technique used in petrol / gasoline and diesel engines . EGR works by recirculating a portion of an engine 's exhaust gas back to the engine cylinders . This dilutes the O in the incoming air stream and provides gases inert to combustion to act as absorbents of combustion heat to reduce peak in - cylinder temperatures . NO is produced in high temperature mixtures of atmospheric nitrogen and oxygen that occur in the combustion cylinder , and this usually occurs at cylinder peak pressure . Another primary benefit of external EGR valves on a spark ignition engine is an increase in efficiency , as charge dilution allows a larger throttle position and reduces associated pumping losses . </P>
what does egr stand for on a diesel
what does egr stand for on a diesel
exhaust gas recirculation
exhaust gas recirculation