Influence of the single EGR valve usability on development of the charge directed to individual cylinders of an internal combustion engine

Abstract

Abstract. Exhaust gas recirculation systems (EGR), aside to a catalytic converters, are nowadays widely used in piston internal combustion engines to reduce nitrogen oxides (NOx) in the exhaust gas. They are characterized in that a portion of exhaust gases from the exhaust manifold is recirculated (via a condenser), and directed to a particular valve. The valve, depending on the current engine load and speed, doses the appropriate amount of exhaust gas into the exhaust manifold. Moreover, its location has a significant impact on the diverse formation of nitrogen oxides and fumes smokiness from the individual cylinders of the engine, which is a result of uneven propagation of exhaust gas into the channels of the intake manifold. This article contains the results of numerical characterized charges formed in symmetrical intake manifold with a centrally-placed EGR valve. Simulations were performed for the original intake system derived from the two-liter, turbocharged VW diesel engine.

Effect of deposition of carbon deposits on charge flow in EGR valve in CI engine

“…Such a valve doses the appropriate amount of exhaust gas into the inlet manifold, relative to the engine load and speed. The location of the EGR valve causes diverse formation of NO x and fumes smokiness from the individual cylinders of the engine, due to an uneven propagation of exhaust gas into the channels of the inlet manifold [19].…”