...Seyfi Polat; Hamit Solmaz; Ahmet Uyumaz; Alper Calam; Emre Yılmaz; H. Serdar Yucesu In this study, the effects of negative valve overlap (NVO) on homogenous charge compression ignition (HCCI) combustion and engine performance were experimentally investigated. A four stroke, single cylinder, port...

...Jacek Hunicz; Maciej Mikulski The present study investigates various measures to reduce pressure rise rates (PRRs) in a residual-affected homogeneous charge compression ignition (HCCI) engine. At the same time, the impact of those measures on efficiency and emissions is assessed. Experimental...

...Hsin-Luen Tsai; J.-Y. Chen; Gregory T. Chin In conclusion, good agreement is shown with the diesel engine cases while unsatisfactory agreement is shown with the IQT and HCCI engine tests. More development work needs to be performed on the mechanism in the low temperature, low pressure regime...

... a homogeneous charge compression ignition (HCCI) fuel index suitable for comparing different fuels for HCCI operation. One way to characterize a fuel is to use the auto-ignition temperature (AIT). The AIT can be extracted from the pressure trace. Another potentially interesting parameter is the amount of low...

... charge compression ignition (HCCI) engine fueled with n-heptane. The engine was operated with four fuel blends containing up to 50% iso-octane by liquid volume at 900 rpm, 50:1 air-to-fuel ratio, no exhaust gas recirculation, and an intake mixture temperature of 30 ° C . A detailed analysis...

...Junseok Chang; Zoran S. Filipi; Tang-Wei Kuo; Dennis N. Assanis; Paul M. Najt; Rodney B. Rask Expanding the range of HCCI operation will be critical for maximizing the fuel economy benefits in future vehicle applications. The mixture stratification, both thermal and compositional, can have very...