Study on exergy recovery in hybrid vehicles via wastegate losses

Authors : Alessandro JOSÉ TRUTA BESERRA DE LİMA, Caio HENRİQUE RUFİNO, Janito VAQUEİRO FERREİRA, Waldyr LUİZ RİBEİRO GALLO

Pages : 43-51

Doi:10.5541/ijot.633112

View : 12 | Download : 10

Publication Date : 2020-02-29

Article Type : Research Paper

Abstract :Vehicle hybridization is considered a promising alternative for pollutant emission mitigation. This type of vehicle combines the use of an internal combustion engine and electrical power. One of the most common layout is the series-parallel hybrid vehicle, which consists of the use of one combustion engine as the main source of power in parallel to electrical sources. Besides propelling the vehicle, the combustion engine has the task of supplying energy to the electrical system. In parallel to hybridization, other technologies, such as the downsizing of an engine via turbocharging, have been adopted to increase thermal efficiency of internal combustion engines. The purpose of this work is to analyse the viability of combining the aforementioned technologies. To improve energy utilisation, part of the energy of the exhaust system is recovered from a free turbine, being directed to the vehicle`s battery. To evaluate the viability of the proposal, experimental data was obtained from a turbocharged spark-ignition engine. Efficiency indexes were calculated based on exergetic analyses for the turbo-compressor set and the entire engine system. Thereafter, a virtual free turbine was virtually added, assuming that it operates exactly as the main turbine and the efficiency indexes were re-calculated as also absolute values of the recovered energy. The comparison of results indicates the viability of implementing this proposal.
Keywords : Hybrid vehicles, Gasohol, Exergetic Efficiency, Downsizing, Spark ignition Engines