Modeling of working processes of engines operating on gaseous fuels

Abstract

This paper examines a promising approach to reducing operating costs of internal combustion engines: converting them to run on gaseous fuel. The challenge with this method is the fundamental change in the operating conditions of most powertrain components and assemblies, which requires careful preliminary analysis. To address this issue, a mathematical model was developed, which is a universal system of volume balance differential equations. A key advantage of the proposed model is its capability to interact with other subsystems—such as intake and exhaust manifolds—via feedback loops, enabling comprehensive simulation of heat and mass transfer, mixture formation, fuel supply, and air exchange processes. Implemented in the MathCAD environment, the model is currently adapted for highspeed, naturally aspirated gas engines with external mixture formation and a cylinder diameter of 70–95 mm. The developed approach provides a reliable tool for predicting key engine performance parameters, optimizing operating conditions, and reducing the time and cost of experimental refinement during the conversion of conventional engines to gaseous fuels.