EGRsüsteeme

EGR stands for Exhaust Gas Recirculation. An EGR system is a pollution control device that reduces nitrogen oxide (NOx) emissions from gasoline and diesel engines. Nitrogen oxides are formed at high temperatures when nitrogen and oxygen in the air react. By recirculating a portion of the exhaust gas back into the engine's intake manifold, the EGR system lowers combustion temperatures. The exhaust gas is inert and does not contain oxygen, so when mixed with the incoming air-fuel mixture, it displaces some of the oxygen and absorbs heat, thereby reducing the peak combustion temperature.

There are two main types of EGR systems: internal EGR and external EGR. Internal EGR is achieved by adjusting valve timing to allow some exhaust gas to remain in the cylinder after the exhaust stroke. External EGR systems use a separate EGR valve to physically move exhaust gas from the exhaust manifold to the intake manifold. Modern EGR systems are often electronically controlled, allowing for precise regulation of the amount of exhaust gas recirculated based on engine operating conditions such as speed, load, and temperature. This precise control is crucial for maintaining engine performance and fuel efficiency while effectively reducing NOx emissions.

Over time, EGR systems can become clogged with carbon deposits, which can lead to reduced effectiveness and potential engine problems. Regular maintenance and cleaning are recommended to ensure the EGR system operates efficiently.