The diesel fuel system is equipped with an exhaust gas recirculation system (EGR) to reduce the content of nitrogen oxides (Nox) in exhaust gases. Part of the exhaust gases is returned back to the engine in order to reduce the combustion temperature and thereby reduce harmful impurities in the exhaust gases.
The system is controlled by the DDE control unit at an increased amount of injected fuel, according to a signal from the accelerator pedal sensor, speed sensor, atmospheric pressure sensor and coolant temperature sensor. The control unit, by means of a vacuum control valve controlled by the EGR valve, doses the exhaust gas correctly. The EGR valve is located on the intake manifold. When the coolant temperature is low or if the engine load is high, the exhaust gases do not return. The exhaust gas recirculation system does not require frequent maintenance.
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