Variable valve timing for fuel economy improvement in a small spark-ignition engine

被引:125
作者
Fontana, G. [1 ]
Galloni, E. [1 ]
机构
[1] Univ Cassino, Dept Ind Engn, I-03043 Cassino, Italy
关键词
S1; engine; VVT; Internal EGR; Reverse Miller cycle; Variable swirl; CFD analyzes; TURBULENT-COMBUSTION; FLAME; MODEL;
D O I
10.1016/j.apenergy.2008.04.009
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
080707 [能源环境工程]; 082001 [油气井工程];
摘要
The potential of a simple variable valve timing (VVT) system has been investigated. This system has been designed to Update a small displacement engine pursuing the objective of optimizing both engine performance and, particularly, fuel consumption at part load operation. A continuously variable cam phaser (CVCP), able to produce a reverse Miller cycle effect during the intake phase and a significant internal EGR generation at the end of the exhaust stroke, has been introduced. A numerical approach, based on both 1-D and 3-D) computational models, has been adopted in order to evaluate the engine performance when load is controlled by the VVT system and to deeply investigate the influence, on in-cylinder phenomena, of the valve timing variation. In this way, the VVT system here analyzed revealed as an effective too[ in reducing the pumping losses, hence the specific fuel consumption, at partial load. (c) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:96 / 105
页数:10
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