Reducing the content of nitrogen oxides in the exhaust gases of the engine is achieved by equipping the car with an exhaust gas recirculation system (EGR).
The system provides for the removal of part of the exhaust gases back to the combustion chambers. The volume of exhaust gases returned for re-burning is controlled by a mechanical valve, which, in turn, is actuated by a solenoid valve.
The solenoid valve is controlled by a microprocessor. This principle of operation of the exhaust gas recirculation system is controlled by a microprocessor. This principle of operation of the exhaust gas recirculation system ensures the stability of the engine
The mechanical valve is closed and the exhaust gas return is not performed if the engine is not warm and the coolant temperature is low. The same happens when the engine is idling, when driving at low speed or when there is no load on the engine.