Thermodynamic Analysis and Benchmark of Various Gasoline Combustion Concepts

Abstract

<div class="htmlview paragraph">Novel Combustion technologies and strategies show high potential in reducing the fuel consumption of gasoline spark ignition (SI) engines. In this paper, a comparison between various gasoline combustion concepts at two representative engine operating points is shown. Advantages of the combustion concepts are analyzed using thermodynamic split of losses method. In this paper, a tool for thermodynamic assessment (Split of Losses) of conventional and new operating strategies of SI engine and its derivatives is used.</div> <div class="htmlview paragraph">Technologies, like variable valve actuation and/or gasoline direct injection, allow new strategies to run the SI engine unthrottled with early inlet valve closing (SI-VVA) combined with high EGR, charge stratification (SI-STRAT) and controlled auto ignition (CAI), also known as gasoline homogeneous charge compression ignition (HCCI). These diverse combustion concepts show thermodynamic gains that stem from several, often different sources.</div> <div class="htmlview paragraph">This thermodynamic gains will be pointed out herein and the differences will be described and analyzed in detail to highlight the merits of the different combustion concepts.</div>