The EGR valve is a small component that is designed to facilitate the movement of gases in and out of the combustion chamber by simply opening and closing the valve. The role of the EGR stays the same irrespective of the engine system configuration. Like everything in nature, these EGR valves also have limitations and tend to fail. First remove the engine cover. Then loosen the electrical cable on the valve and remove the electrical connections and/or vacuum lines, checking for signs of damage. Remove the fastening screws and check the valve for damage, corrosion or carbon build-up. Clean the EGR valve mounting surface thoroughly and fit new valve and gasket. A Euro 6 Nissan 1.5 dCi engine (model K9K) was used in this study. This is a four-cylinder turbocharged, intercooled, direct-injection diesel engine, which is equipped with double EGR system, one low-pressure cooled EGR (LP-EGR) and another high-pressure non-cooled EGR (HP-EGR). In addition, the after-treatment system includes a diesel badunit said: The emissions equipment is as follows: Cooled exhaust gas recirculation (EGR) to reduce NOx. Selective Catalyst Reduction (SCR) that requires injection of diesel exhaust fluid (DEF) to reduce NOx. The DEF vaporizes into ammonia and carbon dioxide. When it mixes with the exhaust gases in the SCR, the NOx in the exhaust converts to The bypass flap allows the exhaust gases to be routed past the EGR cooler in the warm-up phase so that the engine and catalytic converter achieve their operating temperature more quickly. A further advantage is a reduction in noise generation, so-called “diesel knock” as well as in the level of raw hydrocarbon emissions in the warm-up phase. In general, for marine diesel engines, an EGR scrubber, a demister, and a water treatment system for PM and SO x reduction in recirculated gas should be integrated into the EGR system because the engine is damaged by introducing uncleaned EGR gas. The difference of the position at which exhaust gas is taken in for recirculation exists for LP Exhaust Gas Recirculation (EGR) Engines The NOx emissions reduction technique lies within the engine, wherein the engine re-circulates a portion of the exhaust gas back to the engine cylinders depriving it of certain amount of oxygen thereby leading to lower temperature burn. This reduces NOx emissions, but produces more PM which is reduced using diesel oxidation catalyst (DOC) and particulate Electronic engine control plays a vital role in the exhaust emission control from today’s advanced engines. From the emission perspective, the goal of the engine control system is to provide the demanded quantity of fuel, air, and EGR (if any) at the required time and in the required temperature and pressure state. Vay Tiền Nhanh Chỉ Cần Cmnd.

how egr works in diesel engine