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When We Talk About EGR System, We Understand That It Is The Exhaust Gas Re-Circulation System. By Introducing The Exhaust Gas Into The Combustion Chamber, It Can Reduce The Peak Combustion Of The Engine And Achieve The Purpose Of Reducing NOx Emissions.
Diesel Cars Use An External System, That Is, A Pipe Is Connected Between The Exhaust Pipe And The Intake Pipe, And A Valve Is Installed In The Pipe To Control The Amount Of Exhaust Gas Entering. It Can Be Seen That EGR Valve Is The Core Component Of The Whole System, And How To Accurately Control And Monitor It Is The Development Direction Of EGR System.
EGR: Short For Exhaust Gas Re-Circulation, The Technique (Or Method) Of Re-Burning An Internal Combustion Engine By Separating Some Of The Exhaust Gas And Introducing It To The Intake Side. The Main Purpose Is To Reduce The Nitrogen Oxide (NOx) In The Exhaust Gas And Increase The Fuel Consumption Rate When Sharing Part Of The Load.
EGR Working Mechanism
Exhaust Gas Re-Circulation, Or EGR, Is A System That Sends A Small Part Of The Exhaust Produced By The Diesel Or Gasoline Engine Back To The Cylinder.
Recirculating Exhaust Gases Will Slow Down The Combustion Process Because They Are Inert, That Is, The Combustion Rate Will Slow Down And The Pressure Formation Process In The Combustion Chamber Will Slow Down, Which Is The Main Reason For The Reduction Of Nitrogen Oxides.
In Addition, Improving The Exhaust Gas Re-Circulation Rate Will Reduce The Total Exhaust Gas Flow (MASS Flow), So The Total Pollutant Output In Exhaust Gas Emissions Will Be Relatively Reduced.
The Mission Of The EGR System Is To Optimize The Amount Of Exhaust Gas Re-Circulation At Each Operating Point, Thus Ensuring That The Combustion Process Is Always In The Optimal Condition, And Ultimately To Ensure That The Pollution Component Of The Discharge Is Minimal.
Because The Change In The Amount Of Exhaust Gas Re-Circulation May Have Opposite Effects On Different Pollution Components, The So-Called Optimal Situation Is Often A Compromise To Achieve The Optimal Overall Discharge Of Related Pollutants.
For Example, While Increasing Exhaust Recycling Rates Has A Positive Effect On Reducing Nitrogen Oxide (NOx) Emissions, It Also Has A Negative Effect On Increasing Levels Of Particulate Matter And Other Pollutants.
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