Electric turbo, a key technology to achieve Eu7 hybridized powertrain (lambda 1, performance and energy efficiency)

Bontemps, Nathaniel; Ortíz, Ángel; Ladonnet, M.; Zecchetti, Daniele; Heintz, S.; Davies, P.O.A.L.

doi:10.1007/978-3-658-26528-1_6

Cited by 4 publications

(2 citation statements)

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“…Scavenging strategies are usually adopted to improve the time-to-boost in turbocharged engines avoiding unstable operating condition of the compressor by increasing the air mass flow rate thanks to an increase in the overlap of the intake and exhaust valves; this method results in a lean air fuel mixture with a strong reduction in the conversion efficiency of the three way catalytic converter. 19 The results of the first type of test described in paragraph Transient experimental set-up are shown below: to understand the time-to-boost advantage provided by the e-compressor, it is necessary to compare the transient response of the main turbocharger and the e-compressor. In Figure 8, the solid line represents the transient response of the boosting system when the waste-gate valve is moved from a fully open to a fully closed position and the e-compressor is kept in idle condition.…”

Section: Transient Experimental Resultsmentioning

confidence: 99%

Experimental analysis and 1D simulation of an advanced hybrid boosting system for automotive applications in transient operation

Marelli

Usai

2021

International Journal of Engine Research

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Due to the increasingly restrictive limits of pollutant emissions, electrification of automotive engines is now mandatory. For this reason, adopting hybrid boosting systems to improve brake specific fuel consumption and time-to-boost is becoming common practice. In this paper an advanced turbocharging system is analyzed, consisting in an electrically assisted radial compressor and a traditional turbocharger. As a first step, the steady-state performance of each component was measured at the University of Genoa test rig. Subsequently another experimental campaign was carried out to evaluate the transient response of the entire turbocharging system. Two different layouts were compared: upstream and downstream. In the upstream configuration the electrically assisted compressor was placed in front of the traditional turbocharger, in the downstream configuration the e-compressor was positioned after the traditional turbocharger. The two different coupling configurations, upstream and downstream, were then modeled in 1-D simulation software following the dimensions and characteristics of the experimental line from which the exploited data originates. The models were first validated by emulating the steady-state condition and subsequently the transient response was simulated and analyzed. Secondly, the transient response of the two layouts was compared, removing the constraints imposed by the experimental activity. The practical significance of the results is outlined, with reference to the transient response of the turbocharger. The adoption of the boosting system presented here allows a fast and stable transient response. Moreover, a reduction in the engine back pressure could be achieved through an optimization of the boosting system-engine matching calculation.

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Section: Transient Experimental Resultsmentioning

confidence: 99%

Experimental analysis and 1D simulation of an advanced hybrid boosting system for automotive applications in transient operation

Marelli

Usai

2021

International Journal of Engine Research

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“…Presumably, the number of particles will need to be examined over a larger size range (from 10 nm versus 23 nm). Another possible change could be the introduction of limit values for NO 2 and even for N 2 O, NH 3 and aldehydes (Bielaczyc and Woodburn, 2019;Bontemps et al, 2019).…”

Section: Relevant Legislation and Limits For Gasoline Engine's Emissionmentioning

confidence: 99%

Investigation of Possibilities of λ = 1 Full Load Operation for Gasoline Engines in the Light of Future Emission Regulation

Szabados

Szűcs

Hézer

et al. 2022

Period. Polytech. Transp. Eng.

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To date, huge amounts of money have been invested in the development of internal combustion engines to reach the current level of technology. High specific power and good thermal efficiency have been achieved, thanks to which, internal combustion engines are now widely used. However, the driving force behind the developments is no longer the high performance, but the compliance with strict emission standards. Future emissions regulation, namely Euro 7, will be challenging for engine and vehicle manufacturers. One possible technical solution may be to use a stoichiometric air-fuel mixture on the entire engine map to meet the requirements of the Euro 7 emission standard. This article analyzes the change in Euro regulations in the light of Euro 7, as well as the theoretical background of the λ = 1 operation. Several technical possibilities to achieve the stoichiometric ratio, such as e.g. water injection or variable compression ratio are presented.

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Numerical Analysis of Electrically Assisted Turbocharger Application on Hybrid Vehicle

Eggimann¹,

Frigo²,

Lutzemberger³

et al. 2021

SAE Technical Paper Series

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Electric turbo, a key technology to achieve Eu7 hybridized powertrain (lambda 1, performance and energy efficiency)

Cited by 4 publications

References 0 publications

Experimental analysis and 1D simulation of an advanced hybrid boosting system for automotive applications in transient operation

Experimental analysis and 1D simulation of an advanced hybrid boosting system for automotive applications in transient operation

Investigation of Possibilities of λ = 1 Full Load Operation for Gasoline Engines in the Light of Future Emission Regulation

Numerical Analysis of Electrically Assisted Turbocharger Application on Hybrid Vehicle

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