Exhaust Gas Recirculation (EGR)
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The exhaust gas recirculation system directs a portion of the gases from the exhaust back into the engine, thereby it reduces the nitrogen oxides which are formed during the combustion of fuel. A motor control in form of an exhaust gas recirculation valve regulates the entire process and is required for internal combustion engines to ensure that the statutory emission limits can be met. This valve is adjusted either electrically or pneumatically and creates the connection between the exhaust duct and intake.
Operation of the exhaust gas recirculation:
During the operation of a combustion engine the nitrogen from the air and the oxygen are connected by high temperatures. Thereby the nitrogen is burned and toxic fumes are generated in form of nitrogen oxides which are again supplied with fresh air by the exhaust gas recirculation. The new resulting mixture of exhaust gas and fresh air has a lower calorific value and therefore does not reach the temperature in the combustion chamber, which is necessary for the formation of nitrogen. By this operation other pollutants are increased which are filtered by the catalyst. As the low oxygen content causing an incomplete combustion of the fuel, the oxygen sensor is used to control the fuel supply in accordance with the available oxygen concentration.