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This is a more important part of all vehicle for road permit,because when you driving on street and traffic told about vehicle document and driving license of all your document are right but you not registered your car on emission control office these condition traffic police fine him this cause car emission system are more important for your car health and road traffic
Car Emission control system have a few many part are fitted for controlling the emission,example

• Automobile Emission control system

         Catalytic converter

•        EGR (Exhaust gas recirculation)

•        Oxygen sensor

•        Air fuel ratio sensor

Catalytic converter

  It is a part of all vehicle for burning exhaust gas out from car ,it is a cylindrical unit about the size of a small silencer and it installed into the exhaust system of a vehicle such as a car, scooter moped,motor cycle or auto rickshaw.it is pleased between the exhaust manifold and the silencer inside the converter there is a 🍯 honeycomb structure of a ceramic or metal which is coated with alumina base material and there after a second coating of precious metal platinum,paradium and rhodium or combination of the same.This second coating serves as a catalyst,a catalyst is a substance which causer a chemical reaction that normally does not happen in the given condition as a result of the catalytic reaction,when the exhaust gases pass over the converter substance toxic gasses dish as CO,HC & NOX are converted into harmless CO2,H2 and N2

THERE ARE TWO TYPE OF CATALYTIC CONVERTER

A 2way converter, which is used to control CO and HC emissions by oxidationA 3way converter,which is used almost in all petrol cars in control co and HC by oxidation as well asNOx by reduction

EGR

1)EGR is promising method of controlling NOx emission,EGR controlled 81-88%of NOx at 30% recycling

2) with 30%recycling there is a fuel penalty of 23.1%to 28%consedering minimum bsfc values for different speed percentage fuel penalty corresponding to minimum bsfc value increased from 3.85% to 28% when the percentage recycling increased from 10% to 30% .

3)with 30% recycling as the speed increased from 9% to 13.5% and from 1.88% to 13.5% in the recycling range of 10% to 30%  even with 20% recycling the loss is maximum power was high as 31.8% with running atb2400 RPM( Revolution per minute)

4)NOx emission is more on higher speed

5) the rate of reduction of NOx  emission is much faster at higher  speed with increase in present recycling🚙

EGR work on some exhaust gas received and mix with normal air which are  in combustion chamber,EGR use for better combustion because. EGR used hot air,it have a electronically controlled valve which are open  and close air tap  for help in better combustion

OXYGEN SENSOR

If any oxygen found on cat exhaust pipes then it's malfunction

AIR FUEL RATIO SENSOR

If  air fuel ratio high or low in 1to 3 second then this sensor are sending data to ECM
And ECM malfunction light glowing in car cluster meter

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