The impact of injector placement on the dose preparation conditions in a gasoline direct injection system

Maciej Sidorowicz,Ireneusz Pielecha

doi:10.19206/ce-2018-104

Abstract

Direct fuel injection requires appropriate conditions for proper ignition of the formed mixture. The proper combustion process is shaped by the direct fuel injection, whose parameters vary. Preparation of the dose requires proper injector placement in the combustion chamber. This article focuses on the issue of the injector specific spatial and angular position in order to implement the injection and atomization of the fuel. The injectors pseudo-optimal location has been presented along with several changed positions. The research was conducted as a simulation experiment using AVL FIRE 2017 software. The best position of the injector was selected based on the fuel spraying and injection process indicators. It has been shown that the spatial position has the most impact and the injector placement angle is of secondary importance.

Highlights

Internal combustion engines with SI remain the main drives in passenger cars, and their position on the market will strengthen [6]
This trend is influenced by, among others, the current aim to reduce the share of CI engines in passenger cars, due to their negative environmental impact [8], and hybridization of car drives, by combining internal combustion engines with electric motors [7, 10]
Downsizing was achieved by increasing the intake air pressure supplied to the engine and using direct fuel injection into the combustion chamber

Summary

Introduction

Internal combustion engines with SI remain the main drives in passenger cars, and their position on the market will strengthen [6]. The development of internal combustion engines with SI in recent years has focused on downsizing, i.e. increasing the engine's power while maintaining a small engine displacement value This was enforced due to the apparent fuel economy (shown only in drive tests carried out under laboratory conditions) as well as the tax regulations used in many countries, where the fee for owning or purchasing a car is determined based on its engine’s displacement value. Gasoline direct injection is a solution that is currently very rapidly replacing indirect injection technology in spark ignition engines. The share of these injection systems in new vehicles equipped with SI engines in the US market increased in years 2009-2015 from 5% to 46%. There are many technical solutions for the fuel injection systems for SI engines, which have found commercial applications

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Conclusion