Agricultural tractor engine combustion in dual-fuel mode: Optimization of pilot fuel injection

Abstract

Presently, ecological degradation due to pollutant emissions and the gradual depletion of fossil fuels, becoming very worrying, are prompting Asian directives to set emission limits for pollutants. This has led manufacturers to continue their research into the development of clean and efficient engine designs using alternative fuels in internal combustion engines. In this work, we focus on the study of engines operating in dual-fuel mode to improve its combustion. The charges take into account, are, 25%, 50%, 75% and 100% of the full engine load, for a speed of rotation kept constant at 1500 rpm. Two types of primary fuels were considered, natural gas and biogas.Biogas is generally composed mainly of methane (CH4) and dioxide carbon (CO2), with a volume composition varying from 50% to 70% for methane and from 30% to 50% for carbon dioxide.In the present study, biogas is composed of 70% methane (CH4) and 30% carbon dioxide (CO2). The results showed that the injection advance improved the effective yield from an advance of 4.5 °CA to 6 °CA.