ENGINE 1.3 QUADRAJET (75PS) 87 Q less air is introduced; Q the combustion temperature is reduced (on account of the presence of inert gases) resulting in a decrease in the formation of NOx (nitrogen oxides). The injection control unit is const antly informed of the quant i ty of gas recirculated through the information coming from the flow meter: in ef fect, if there is an intake of a certain quantity of air (Qam) for a given engine speed and the value sent by the flow meter (Qar) is lower, then the dif erence (Qgr) is the value for the quantity of gas recirculated Qam - Qar = Qgr Qam - Theoretical quantity of air memorized Qar - Actual quantity of air Qgr - Quantity of recirculated gas The atmospheric pressure signal is used for the operation of the E.G.R. solenoid valve to recognize the condition of driving at altitude in order to reduce the quantity of gas recirculated and to prevent engine fumes. A - E.G.R. valve casing B- Gas intake from exhaust manifold C - Gas outlet to intake manifold 1 - Solenoid positive, 5 - Solenoid negative D. E.G.R. SOLENOID VALVE The Pierburg E.G.R. solenoid valve, fitted on the cylinder head, has the task of modulating the flow of exhaust gases to the int ake according to the command from the injection control unit. This modulation takes place by means of the internal solenoid, with PWM operation by the control unit, which activates the control rod via the internal valve which, once open, direct s the gases to the int ake manifold.
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