Investigation into the Relationship between Super-Knock and Misfires in an SI GDI Engine

The super-knock poses new challenges for further increasing the power density of spark ignition (SI) engines. critical factors and mechanism connecting regarding occurrence are still unclear. Misfire is a common phenomenon in SI engines that mixture cylinder not ignited normally, which often caused by plug failure. However, effect misfire on engine combustion has been paid enough attention to, particularly connection to super-knock. paper presents results experimental investigation into relationship between misfires at low speed full load conditions. In this work, boosted gasoline direct injection (GDI) with an exhaust manifold integrated head was employed. Four piezoelectric pressure transducers were used acquire data trace cylinder. plugs four cylinders controlled manually, system could be cut off as demanded. particular, transducer installed pipe before turbocharger capture traces pipe. illustrated one would cause other well itself. After misfired, unburned burn produce oscillating waves. abnormal fluctuation strongly correlated sharper fluctuation, greater intensity knock whose valve overlapped misfired prone