Engine Performance Parametres and Emissions Reduction Methods for Spark Ignition Engine

An experimental study is carried out to investigate engine performance parameters and methods of reducing emissions from spark ignition engine. The used engine is four stroke four cylinder naturally aspirated spark ignition engine with compression ratio of 9, bore diameter of 80 mm and stroke of 90 mm. The engine performance parameters are presented with and without exhaust gases recirculation (EGR). Engine cylinder pressure measurements and engine geometry are used for calculating indicated engine performance parameters. UHC and CO concentrations are measured with EGR, catalyst converter and air injection in the exhaust manifold. UHC and CO concentrations for different methods are compared with the original engine emissions. The investigated parameters are indicated and brake engine performance parameters, air/fuel ratio (AFR) and exhaust gases temperature (Texhaust). Also, engine cycle to cycle variation (CCV) and sound pressure level (SPL) generated from engine are calculated using cylinder pressure, inlet and exhaust manifold pressure measurements. EGR rate of 5%, 7%, 8%, 10% and air injection rate of 3%, 4%, 5%, 6% are used in the present work.. Catalyst converter and air injection in exhaust manifold are useful methods for reducing UHC and CO concentrations on contrast UHC and CO concentrations increase with the increase of EGR. Air injection in the exhaust manifold represents method for reducing UHC and CO exhausted from spark ignition engine. The present work is useful for improving engine performance parameters, reducing engine emissions and further development of spark ignition engines.