Normally, a diesel engine would not need a throttle valve/control damper. In addition, depending on the control option, either a vacuum box is installed or an electric motor.Ĭontrol damper (only for diesel vehicles) The EGR valve is equipped with an inlet and an outlet for the exhaust gases. The EGR valve is a small component in the engine compartment, which may be difficult to find on the first view. On the other hand, there are EGR valves that are controlled directly by the engine control unit (electrically). On the one hand, there are pneumatic EGR valves that are actuated via an electromagnetic valve using a vacuum. There are two different options to control an EGR valve. This is because the EGR rate in diesel vehicles is much higher than in gasoline vehicles. Compared to gasoline engines, the opening cross-section of the valve is usually larger than in diesel vehicles. In most vehicles, the EGR valve is located very close to the intake manifold or directly in the exhaust gas recirculation cooler, if available. The main function of the EGR valve is to regulate the exhaust gases that are enter the intake tract (EGR flow rate). The EGR valve and the EGR cooler are normally located near the engine block. Nowadays, the EGR valve is a component of the exhaust system of all vehicle manufacturers. Components of the exhaust gas recirculation In comparison, the EGR rate at low engine speeds is up to 90% in the part-load range.
#ENGINE EXHAUST GAS RECIRCULATION SYSTEM MONITOR FULL#
When the engine is started and at full load the exhaust gas recirculation system is completely deactivated.
Exhaust gas recirculation can reduce NOX by up to 70%, while diesel vehicles can reduce soot particles by 10%.ĭepending on the load and driving condition, the engine control unit determines how much exhaust gas is added to the intake via the EGR valve, which is the so-called ‘exhaust gas recirculation flow rate’. The colder the combustion is, the less harmful NOX nitrogen oxides are produced during combustion. The lower oxygen content lowers the combustion temperature in the cylinder. This reduces the proportion of oxygen in the air-fuel mixture because the exhaust gases suppy contains much less oxygen than fresh air.
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