1. the EGR exhaust gas recirculation system
an exhaust gas recirculation (EGR) system for a discharge amount of nitrogen oxides in the exhaust gas (of NOX) is reduced.
will only nitrogen and oxygen in a chemical reaction conditions under high temperature and pressure, engine temperature and pressure of the combustion chamber meets the above conditions, especially during the forced acceleration.
When the engine is operating under a load, the EGR valve is opened, a small amount of exhaust gas into the intake manifold, the combustible mixture into the combustion chamber together. EGR valve is closed during idling, almost no exhaust gas recirculation to the engine. Is a non-automotive exhaust gas (without the fuel and oxidant), does not participate in combustion in the combustion chamber. It is to reduce the combustion temperature and pressure by absorbing some of the heat of combustion to reduce the generation of nitrogen oxides. Amount of exhaust gas into the combustion chamber increases as the engine speed and load increases.