Determining the criteria and the degree of the stratification of the air-fuel charge in a cylinder of a spark-ignition engine during injecting fuel

Abstract

In internal combustion engines with spark ignition and the direct fuel injection, the indicators are offered to evaluate the organization of the working process in the form of a criterion for the stratification of the air-fuel charge and the degree of stratification of the air-fuel mixture. Using the experimental data of a two-stroke engine with spark ignition and the direct injection of fuel with load characteristics, the values of the excess air coefficient in a cylinder and in the volume of the air-fuel mixture are determined. A comparative assessment of the suggested indicators in the organization of the workflow with the stratification of depleted fuel-air charge is presented. It has been defined that a more promising way of organizing the workflow to improve the fuel and economic performance of a spark ignition engine is organizing the fuel injection with the stratification of a depleted air-fuel charge.