In the paper, the potentialities offered by an advanced valve lift design are numerically analyzed. In particular, the study is carried out by a 1D approach and regards the characterization of a VVA strategy named “pre-lift” applied to a downsized turbocharged four-cylinder engine. The pre-lift consists of a small, almost constant lift of the intake valve during the exhaust stroke, so to increase the valves overlapping. The results show a benefit on the fuel economy and on the gas-dynamic noise at part load and a substantial increase in the delivered torque at full load, while preserving the fuel consumption.
Effects of Pre-Lift intake valve strategies on the performance of a DISI VVA turbocharged engine at part and full load operation / DE BELLIS, Vincenzo; Gimelli, Alfredo; Muccillo, Massimiliano. - In: ENERGY PROCEDIA. - ISSN 1876-6102. - 81:(2015), pp. 874-882. (Intervento presentato al convegno 69th Conference of the Italian Thermal Engineering Association, ATI 2014 tenutosi a Milan; Italy nel 10 September 2014 through 13 September 2014) [10.1016/j.egypro.2015.12.141].
Effects of Pre-Lift intake valve strategies on the performance of a DISI VVA turbocharged engine at part and full load operation
DE BELLIS, VINCENZO;GIMELLI, ALFREDO;MUCCILLO, MASSIMILIANO
2015
Abstract
In the paper, the potentialities offered by an advanced valve lift design are numerically analyzed. In particular, the study is carried out by a 1D approach and regards the characterization of a VVA strategy named “pre-lift” applied to a downsized turbocharged four-cylinder engine. The pre-lift consists of a small, almost constant lift of the intake valve during the exhaust stroke, so to increase the valves overlapping. The results show a benefit on the fuel economy and on the gas-dynamic noise at part load and a substantial increase in the delivered torque at full load, while preserving the fuel consumption.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
