Requirements for the fuel injection system to use of biodiesel

Abstract

ABSTRACT
• Biodiesel, when used as an alternative fuel in its pure state 
or mixed with diesel, requires certain modifications of time 
and pressure of the fuel injection to the engine. In the 
present study, the properties and characteristics to fulfill 
by fuel injector nozzles when biodiesel is used as fuel, are 
determined. With the characterization results of neat diesel 
and neat biodiesel; as well as a blend of 20% biodiesel and 
80% diesel, the main parameters of the fuel injection were 
calculated and simulated according to the power requirements 
of the engine. The purpose of the present investigation is to 
determine the fuel injection control parameters that allow 
equivalent use of diesel and biodiesel, without any change in 
its components. It was found that maintaining the diameter of 
the nozzle holes, the atomization characteristics of both type 
of fuels can be maintained by controlling the injection time 
and pressure; compensating in addition, differences in heat 
values, density and viscosity of biodiesel blends compared to 
neat diesel. Biodiesel is the alternative to pollution problems 
and sources of energy to operate internal combustion engines; 
however, to be established as a sustainable and immediately 
applicable solution, modifications to the engine must be at the 
level of fuel injection control, avoiding any kind of change or 
replacement of components. 
• Keywords: Biodiesel, Diesel, Nozzle, Flow rate, Density, Fuel 
injection.