17 486 PL ENGINE P EMISSION CONTROL SYSTEMS A) EXHAUST GAS RECIRCULATION FUNCTION : As the name says, part of the exhaust gases is recirculated into the combustion chamber. The purpose of this technology is the reduction of the combustion temperature which consequentially reduces the NOx emissions. WORKING : A defined portion of the engine exhaust emission are extracted and returned to the fresh air / fuel mixture via solenoid valve. The exhaust gas recirculation is controlled by a EGR valve which meters the recirculated exhaust gas with reference to factors such as engine speed, intake manifold pressure and engine temperature. 1. EXHAUST GAS RECIRCULATION 2. EGR VALVE 3. ECU 4. MASS AIR FLOW SENSOR N. ENGINE SPEED PS. PHASE SENSOR T. COOLANTTEMPERATURE 1 2 3 1 4 N PS T Fig. 13
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