Influence of Fuel Injection, Turbocharging and EGR Systems Control on Combustion Parameters in an Automotive Diesel Engine

Giorgio Zamboni

doi:10.3390/app9030484

Abstract

Indicated pressure diagrams were measured during experimental campaigns on the control of fuel injection, turbocharging and hybrid exhaust gas recirculation systems in an automotive downsized diesel engine. Three-part load operating conditions were selected for four test sets, where strategies aimed at the reduction of NOX emissions and fuel consumption, limiting penalties in soot emissions and combustion noise were applied to the selected systems. Processing of in-cylinder pressure signal, its first derivative and curves of the rate of heat release allowed us to evaluate seven parameters related to the combustion centre and duration, maximum values of pressure, heat release and its first derivative, heat released in the premixed phase and a combustion noise indicator. Relationships between these quantities and engine operating, energy and environmental parameters were then obtained by referring to the four test sets. In the paper, the most significant links are presented and discussed, aiming at a better understanding of the influence of control variables on the combustion process and the effects on engine behaviour. The proposed methodology proved to be a consistent tool for this analysis, useful for supporting the application of alternative fuels or advanced combustion modes.

Highlights

Diesel engines are losing popularity, especially in the transport sector considering both private and public mobility, due to their negative impact on NOX and Particulate Matter (PM) emissions and the high costs required to develop propulsion systems complying with current and future legislation.their complete replacement in all the applications is hard to be predicted, taking into account their overall efficiency and amount of energy which can be stored on a vehicle.As a consequence, investigations on the main engine subsystems and their influence on performance, fuel consumption and emissions are still worth to be made, especially if focusingAppl
Sci. 2019, 9, 484 on peculiar aspects such as the combustion process and its relationship with operating, energy and environmental parameters. Taking into account this point, the paper presents an experimental study on the analysis of changes in a wide set of combustion parameters when applying control strategies to fuel injection, turbocharging and hybrid exhaust gas recirculation (EGR) systems in an automotive diesel engine with a total displacement of 1.248 dm3
Combustion parameters were obtained through proper processing of indicated pressure diagrams, the first derivative of the in-cylinder pressure signal and rate of heat release (RoHR) curves

Summary

Introduction

Diesel engines are losing popularity, especially in the transport sector considering both private and public mobility, due to their negative impact on NOX and Particulate Matter (PM) emissions and the high costs required to develop propulsion systems complying with current and future legislation.their complete replacement in all the applications is hard to be predicted, taking into account their overall efficiency and amount of energy which can be stored on a vehicle.As a consequence, investigations on the main engine subsystems and their influence on performance, fuel consumption and emissions are still worth to be made, especially if focusingAppl. Diesel engines are losing popularity, especially in the transport sector considering both private and public mobility, due to their negative impact on NOX and Particulate Matter (PM) emissions and the high costs required to develop propulsion systems complying with current and future legislation Their complete replacement in all the applications is hard to be predicted, taking into account their overall efficiency and amount of energy which can be stored on a vehicle. Combustion parameters were obtained through proper processing of indicated pressure diagrams, the first derivative of the in-cylinder pressure signal and rate of heat release (RoHR) curves Relationships between these parameters, fuel consumption and emissions were developed in order to describe the observed variations, offering numerical instruments for the modelling of detected trends and the development of suitable control strategies aiming at the achievement of proper goals involving selected variables

Objectives

Results

Conclusion