Numerical Analysis of Electrically Assisted Turbocharger Application on Hybrid Vehicle

Eggimann, Francesco; Frigo, Stefano; Lutzemberger, Giovanni; Pasini, Gianluca; Marmorini, Luca

doi:10.4271/2021-01-5090

Cited by 3 publications

(4 citation statements)

References 26 publications

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“…This complexity may translate into maintenance challenges, requiring a commensurate investment in specialized knowledge and resources. Furthermore, the incorporation of electric components elevates the overall cost of the vehicle, potentially impacting market competitiveness [72].…”

Section: Methodsmentioning

confidence: 99%

“…Opportunities: The contemporary landscape witnesses a growing market for ecofriendly vehicles, providing a substantial opportunity for the adoption of hybrid models featuring HETs. As advancements in electric motor and battery technologies continue, there exists promising potential for further refinement and optimization of HET integration, aligning with broader trends toward sustainable transportation [72,73].…”

Section: Methodsmentioning

confidence: 99%

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Review of the Integration of Hybrid Electric Turbochargers for Mass-Produced Road Vehicles

Suciu,

Igret,

Vetres

et al. 2024

Energies

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This study presents the findings of a comprehensive SWOT analysis on the integration of hybrid electric turbochargers (HETs) in mass-produced road vehicles. Through a synthesis of multiple research findings, this study compared the performance of HETs on thermal engines versus traditional turbochargers and HETs on thermal engines versus HETs on hybrid engines. The analysis highlights key strengths, weaknesses, opportunities, and threats associated with the adoption of HET technology in the automotive industry. The results of the SWOT analysis provide valuable insights for both manufacturers and consumers regarding the feasibility and benefits of adopting HET technology in modern vehicles. By elucidating the fundamental mechanics of turbochargers and demonstrating the potential of hybrid electric turbocharging, this study contributes to a deeper understanding of the role of HETs in shaping the future of automotive engineering. In conclusion, this study underscores the potential of HETs to substantially mitigate the environmental impact of the transportation sector by reducing emissions and conserving energy. The novelty of this study is reflected in its comprehensive synthesis of multiple research findings, offering insights into the feasibility and benefits of adopting HET technology in modern vehicles, thereby contributing to a deeper understanding of the role of HETs in shaping the future of automotive engineering and highlighting their continued significance, as evidenced by the systematic SWOT analysis presented. Their ability to optimize fuel efficiency and power output, coupled with the feasibility of downsized engines, positions HETs as an attractive option for sustainable mobility solutions. Further research is warranted to comprehensively understand the environmental and economic implications of widespread HET adoption.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Review of the Integration of Hybrid Electric Turbochargers for Mass-Produced Road Vehicles

Suciu,

Igret,

Vetres

et al. 2024

Energies

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show abstract

“…The results demonstrate the effectiveness of the model in accurately predicting the behavior of the power unit and its impact on the overall performance of the series hybrid vehicle powered by a 2 L turbocharged diesel engine. Eggimann et al [13] made only a numerical analysis on the benefits of the electrically assisted turbocharger in a hybrid electric vehicle powered by a 1.3 L gasoline engine. A recent work by Pipitone et al [14] evaluates with a theoretical approach the efficiency improvements obtainable by the separated compound electric engine in comparison with a traditional turbocharged engine for hybrid vehicle applications.…”

Section: Introductionmentioning

confidence: 99%

Energy Analysis of a Novel Turbo-Compound System for Mild Hybridization of a Gasoline Engine

Lombardi,

Ricci,

Martinelli

et al. 2023

Energies

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Efficient and low-polluting mobility is a major demand in all countries. Hybrid electric vehicles have already shown to be suitable to respond to this need, being a reliable alternative to conventional cars, at least in urban environments. Nevertheless, such vehicles present a yet unexplored potential. In this paper, we will investigate how the powertrain efficiency may possibly benefit, in an integrated drivetrain for a hybrid electric vehicle, based on a turbocharged gasoline engine, of an innovative supercharging system. The compressor and turbine will be mechanically decoupled so as to independently optimize their operation, avoiding turbo lag and maximizing energy recovery by completely eliminating the waste-gate valve. This, in turns, requires changing the turbine so as to have a flattest possible efficiency/load curve. Therefore, an ad-hoc designed turbine will be implemented in the decoupled configuration, to be used to drive an electrical generator and produce electrical energy for charging the battery. This study presents a preliminary assessment of the potential of a turbo-compounded system for a 1L turbocharged gasoline engine for a small city car. To this aim, a one-dimensional dynamic model of the engine has been built in GT-Suite and has been calibrated and validated by means of experimental data obtained on a dynamometer, both in steady state and dynamic conditions. In particular, the model has been calibrated by means of experimental data obtained in stationary conditions and its robustness has then been verified through experimental data obtained under transient conditions. The model also includes data retrieved from the characterization of the existing turbine and compressor, while a new performance map for the turbine has been designed to better exploit the potential of the components’ decoupling. Results include the estimation of energy recovery potential of such a solution. Under the implementation of a straightforward control strategy, which runs both compressor and turbine at the same speed, the system is able to achieve a 60.57% increase in energy recovered from the exhaust gasses in the turbine. Afterwards, an attempt was made to limit the minimum turbine speed to 45000 rpm and simultaneously decrease the instantaneous speed by 3000 rpm compared to the compressor, attaining a further increase of 1.7% in the energy recovered by the turbine.

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“…They claimed that the overall efficiency of the engine with ETC improved when it provided a variable power output. In a subsequent work [17], Eggimann et al carefully evaluated the integration of the ETC concept in a full vehicle following the WLTC driving cycle, evidencing the importance of sizing the ETC unit for the average power required by the vehicle and not for the maximum that can be obtained from the engine.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of energy recovery system for turbocharged internal combustion engines via a parallel compounding turbine

Frigo

Francesconi

Sani

et al. 2022

J. Phys.: Conf. Ser.

Self Cite

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Increasing energy efficiency requirements mandatory ask for optimizing energy utilization in many devices, which include internal combustion engines. One of the most investigated subjects is the energy recovery from the exhaust, such as turbo-compound systems, which usually consist in a secondary turbine located afterward the turbocharger. Here an alternative arrangement is proposed and analysed via a numerical model. The recovery turbine works in parallel to the main turbine and uses the gasses which would be otherwise wasted through the waste-gate valve, once the set-point boost pressure is reached. The reference case analysed is a 12.4L turbocharged diesel engine, commonly used in marine, road and light railroad applications, with a nominal power of 380kW. The results showed that an overall 8% of power can be gained, without nor increasing the fuel mass flow rate, neither requiring significant modifications to the baseline engine. Moreover, in the case of the recovery system failure, the operation of the engine is not affected, thus resulting in no engine availability reduction. This work also shows a feasible way to convert the mechanical energy delivered by the recovery turbine into electrical energy, by making use of a high-speed electrical generator.

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Numerical Analysis of Electrically Assisted Turbocharger Application on Hybrid Vehicle

Cited by 3 publications

References 26 publications

Review of the Integration of Hybrid Electric Turbochargers for Mass-Produced Road Vehicles

Review of the Integration of Hybrid Electric Turbochargers for Mass-Produced Road Vehicles

Energy Analysis of a Novel Turbo-Compound System for Mild Hybridization of a Gasoline Engine

Numerical analysis of energy recovery system for turbocharged internal combustion engines via a parallel compounding turbine

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