The Theoretycal Contribution Modelling Gasoline Injection at Engines with Spark Lighting

Abstract

the authors present the general aspects of theoretical modeling of gasoline injection, the principle modeling of some of the elements of gasoline injection, namely the gasoline pump model and the pressure regulator model. It is presented the general model of a spark engine with gasoline injection. The modeling of the motor cycles with spark engines and gasoline injection suggested by the authors is realized by executing a computer program for determining the variation of the three-dimensional and bi-dimensional parameters with the subprograms: program for calculating the SIE (dependence according to n and lambda at to=-35...+45ºC and po=1•102 kPa); program for calculating the SIE (dependence according to n and to at lambda=1 and po=1•102 kPa);program for calculating the SIE cycle with gasoline injection. It was realized a study for calculating the pressure from the admission gallery pga and the admission pressure pa.

A comparative study of calculated and experimental indicated diagrams of a S.I. Engine

“…It is considered that in this point the exhausted valve closes instantly and the intake valve opens instantly at the maximum value. The cycle is based on some assumptions [5] and [6].…”

“…The polytropic exponent of the compression process (n c ) can be express as a function of the adiabatic exponent of the compression process (k c ) and of the coefficient that takes into consideration the heat exchange between the working fluid and the cylinder's walls during this process (Φ c =1,06) [1] and [6]:…”