The new dual-charged FSI petrol engine by Volkswagen

Krebs, Rudolf; Szengel, Rüdiger; Middendorf, Hermann; Fleiss, Michael; Laumann, Alfons; Voeltz, Stefan

doi:10.1007/bf03227794

Cited by 11 publications

(4 citation statements)

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Section: The Fundamentals and The Types Of Superchargermentioning

confidence: 99%

“…It thus predates the Otto cycle engine.) Both Volkswagen and Volvo used Eaton (Roots-type) superchargers in their production compound-charged gasoline engines, 34,35,40 and Lotus, Audi and Jaguar have used them as singlestage boosting devices in recent production engines. [41][42][43] Figure 2 show an Eaton Twin-Vortices Series (TVS) Roots-type supercharger 44 and the lobes from a Lysholm screw-type supercharger 45 respectively.…”

Section: The Fundamentals and The Types Of Superchargermentioning

confidence: 99%

“…This is especially the case for a compoundcharging arrangement, in which two or more charging devices are used to provide greater system capability. [33][34][35][36] Because of the strong possibility that supercharging technology will be applied to more passenger car engines in the near future to facilitate further downsizing and more aggressive down-speeding, either in a supercharger-turbocharger arrangement or in a turbocharger-supercharger arrangement, a review of the current concept and approach to achieving supercharging is necessary.…”

Section: Introductionmentioning

confidence: 99%

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Observations on and potential trends for mechanically supercharging a downsized passenger car engine:a review

Turner

Akehurst

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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Engine downsizing is a proven approach for achieving a superior fuel efficiency. It is conventionally achieved by reducing the swept volume of the engine and by employing some means of increasing the specific output to achieve the desired installed engine power, usually in the form of an exhaust-driven turbocharger. However, because of the perceptible time needed for the turbocharger system to generate the required boost pressure, a characteristic of turbocharged engines is their degraded driveability in comparison with those of their naturally aspirated counterparts. Mechanical supercharging refers to the technology that compresses the intake air using the energy taken directly from the engine crankshaft. It is anticipated that engine downsizing which is realised either solely by a supercharger or by a combination of a supercharger and a turbocharger will enhance a vehicle's driveability without significantly compromising the fuel consumption at an engine level compared with the downsizing by turbocharging. The capability of the supercharger system to eliminate the high exhaust back pressure, to reduce the pulsation interference and to mitigate the surge issue of a turbocharged engine in a compound-charging system offsets some of the fuel consumption penalty incurred in driving the supercharger. This, combined with an optimised down-speeding strategy, can further improve the fuel efficiency performance of a downsized engine while still enhancing its driveability and performance at a vehicle level. This paper first reviews the fundamentals and the types of supercharger that are currently used, or have been used, in passenger car engines. Next, the relationships between the downsizing, the driveability and the down-speeding are introduced to identify the improved synergies between the engine and the boosting machine. Then, mass production and prototype downsized supercharged passenger car engines are briefly described, followed by a detailed review of the current stateof-the-art supercharging technologies that are in production as opposed to the approaches that are currently only being investigated at a research level. Finally, the trends for mechanically supercharging a passenger car engine are discussed, with the aim of identifying potential development directions for the future. Enhancement of the low-end torque, improvement in the transient driveability and reduction in low-load parasitic losses are the three main development directions for a supercharger system, among which the adoption of a continuously variable transmission to decouple the supercharger speed from the engine speed, improvement of the compressor isentropic and volumetric efficiency and innovation of the supercharger mechanism seem to be the potential trend for mechanically supercharging a passenger car engine.

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Section: The Fundamentals and The Types Of Superchargermentioning

confidence: 99%

Section: The Fundamentals and The Types Of Superchargermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Observations on and potential trends for mechanically supercharging a downsized passenger car engine:a review

Turner

Akehurst

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…When the supercharger is placed upstream of the turbocharger in the compound boosting system consisting of a turbocharger and a supercharger, it is called the supercharger-turbocharger (SC-TC) boosting system, such as implemented on a 1.4 l four-cylinder SI engine 3,4 and a 2.0 l four-cylinder SI engine. 5 When the turbocharger is placed upstream of the supercharger in the compound boosting system consisting of a turbocharger and a supercharger, it is called the turbocharger-supercharger (TC-SC) boosting system, such as applied on CI engines.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a turbocharger and supercharger compound boosting system for a Miller cycle engine

Sun

Liu

Zhu

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper describes the design optimization of a compound boosting system consisting of a turbocharger and a supercharger for a 2.0 l four-cylinder Miller cycle engine which has a high expansion ratio of 12.0:1 and variable valve actuation. Various system configurations and supercharger sizes were evaluated numerically and experimentally to reduce the supercharger power consumption and the engine fuel consumption while maintaining the same engine torque performance in steady-state conditions. The supercharger–turbocharger boosting system with a V400 supercharger showed an average engine fuel consumption that was 2.8% lower in boosted conditions than did the turbocharger–supercharger boosting system with the same V400 supercharger; this was predicted by engine cycle simulations and verified by experiments. When the supercharger was placed upstream of the turbocharger, the supercharger inlet pressure was lower and the total mass flow rate through the supercharger was reduced, which reduced the supercharger power consumption and the bypass air flow. The turbocharger–supercharger boosting system with a smaller supercharger (R340 or V250) significantly improved the engine efficiency (by 3.3% or 5.0% respectively in comparison with the turbocharger–supercharger boosting system with a V400 supercharger), by reducing the mass air flow rates through the supercharger and minimizing the supercharger power consumption. The turbocharger–supercharger boosting system with a V250 supercharger achieved the lowest engine fuel consumption in full-load conditions of all the turbocharger and supercharger compound boosting system options evaluated for the 2.0 l Miller cycle engine on the basis of the simulation results. This study defined the optimal system layout and the optimal supercharger size for implementing the turbocharger and supercharger compound boosting system on a 2.0 l Miller cycle spark ignition engine to maximize the improvement in the fuel economy of the vehicle while maintaining the same torque performance.

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