Combination of High EGR Rates and Multiple Injection Strategies to Reduce Pollutant Emissions

Investigation of Cluster-Nozzle Concepts for Direct Injection Diesel Engines

“…One approach to reduce the emissions in a diesel engine is PCCI which has been studied over the past years by many researchers using engine experiments [59][60][61][62][63][64][65][66][67] and simulation studies [68][69][70][71]. The basic idea of PCCI is to enhance mixing and evaporation by an early fuel injection in the compression cycle before TDC.…”

A Physics and Tabulated Chemistry Based Compression Ignition Combustion Model: from Chemistry Limited to Mixing Limited Combustion Modes

“…But it is very difficult to reproduce physical phenomena occurring during multiple injections. Indeed, a great part of these phenomena is driven by internal engine geometry, in-cylinder temperature and species distribution and is modified by each previous injection [5,22]. In this study, an approach with multi virtual zones is chosen to describe interactions between each spray.…”

“…Many strategies are developed to control HCCI combustion such as massive EGR combined with multiple injection events. In [5] authors investigate the potential of high EGR rate with an early pilot injection and a main injection close to TDC (Top Dead Center). These latest developments in engine technology involve strong developments of engine models to describe the effects of fuel injection systems on combustion process.…”

“…Today high EGR rates are used together with multi injection strategies to lower NO x and soot emissions and also combustion noise [5,22]. In zero dimensional models, high EGR rates are taken into account through the thermodynamical model and the Auto Ignition model.…”

Study of the association of premixed and diffusive combustion processes on the combustion and pollutant emissions in a mid-size Diesel engine

“…In the last years, many researches have been performed around this new combustion concept [3] and have shown its capability to reduce both soot and N O x emissions even keeping some degree of inhomogeneity in the air/fuel mixture [4]. However HCCI combustion process is limited to low load engine operation and its introduction in serial engine is therefore compromised because, on one hand, an increase in local equivalence ratios results in a fast transition to knocking combustion and, on another hand, ignition timing control is hard to attain [5].…”