VILNIUS TECH Library invites you to follow the published new dissertations. The dissertation „Investigation of the energy and environmental indicators of a bioethanol spark ignition engine exploitation in a hybrid vehicle“ prepared by VILNIUS TECH, Nour Nassar. The dissertation was prepared in 2020–2025. Scientific Consultant – Prof. Dr Alfredas Rimkus.
The dissertation was defended at the public meeting of the Dissertation Defence Council of the Scientific Field of Transport Engineering in the Aula Doctoralis Meeting Hall of Vilnius Gediminas Technical University at 1 p.m. on 13 June 2025.
Environmental concerns and the depletion of fossil resources necessitate the replacement of fossil fuels with renewable fuels produced from local resources. The impact of road transport on environmental pollution is also reduced by improving vehicle energy efficiency. This dissertation investigates renewable fuels suitable for spark-ignition engines (SI) used in hybrid vehicles. The research mainly focuses on the operating characteristics of a hybrid vehicle’s SI engine using various petrol and bioethanol blends. The dissertation aims to determine the influence of petrol–bioethanol blend composition on the energy and environmental performance of an SI engine operating in both conventional and hybrid vehicles. This objective is achieved using experimental and theoretical research methods, including mixture enrichment, supplementary hydrogen supply, and ignition timing adjustments. The results are used to provide recommendations for the most efficient use of these fuel blends. The dissertation consists of an introduction, four chapters, a summary of the results, a list of references, a list of the author’s publications related to the dissertation, and appendices. The introduction discusses the research problem and the relevance of the study, describes the research object, defines the research aim and objectives, presents the research methodology, outlines the scientific novelty, the practical significance of the results, and the defended statements. The introduction closes by listing the author’s publications and conference presentations on the dissertation topic and presenting the dissertation structure. The First Chapter is dedicated to the literature review. It supplements and refines dissertation objectives and provides conclusions. The Second Chapter presents the methodology for engine bench testing, hybrid vehicle WLTC testing, and data analysis. The Third Chapter presents and analyses the results of experimental research on a spark ignition engine and a hybrid vehicle operating on various petrol–bioethanol mixtures. The Fourth Chapter presents the results of numerical analysis and forecasting of the combustion process of petrol–bioethanol mixtures using an artificial neural network. The dissertation topic has served as the basis for three scientific articles published in journals indexed by the Web of Science database (Rimkus et al., 2023; Rimkus et al., 2024a; Rimkus et al., 2024b). The research findings from this dissertation were presented at three scientific conferences.
Doctoral dissertation readers can search via VILNIUS TECH Virtual Library.
