SuperGen on Ultraboost: Variable-Speed Centrifugal Supercharging as an Enabling Technology for Extreme Engine Downsizing

Turner, J. W. G.; Popplewell, A.; Marshall, Dave; Johnson, T. R.; Barker, L.; King, J.; Martin, John J.; Lewis, Andrew; Akehurst, Sam; Brace, Chris; Copeland, Colin

doi:10.4271/2015-01-1282

Cited by 22 publications

(31 citation statements)

References 8 publications

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“…49 Second, a compressor suitable for generating increased boost at low engine speeds can also help to improve the transient driveability owing to its quicker boost generation ability. A CVT inherently provides this capability, given that its ratio range is sufficiently wide.…”

Section: Improvement In the Transient Driveabilitymentioning

confidence: 99%

“…To the present authors’ knowledge, there does not seem to be any literature covering this topic. However, from some simulations and test projects conducted at the University of Bath, 10,38,46,49,65,79,80 it is still possible to summarise some key challenges for developing a viable control strategy for the supercharger system (it should be noted that these follow only some suggestions arising from the engine simulations and test results from the University of Bath and that these should not be interpreted to represent or be calibrated for any specific application).…”

Section: Challenges Of Conventional Supercharged Passenger Car Enginesmentioning

confidence: 99%

“…Also, it should be noted that, at high engine speeds when the fixed-ratio supercharger is not operational, a longer transient response is anticipated which delivers an inconsistent driveability characteristic. 49…”

Section: Challenges Of Conventional Supercharged Passenger Car Enginesmentioning

confidence: 99%

“…As such, their findings were in line with those of Turner et al, who investigated the SuperGen electromechanical supercharger in a highly downsized compound-charged engine application. 49…”

Section: Potential Trends For Mechanically Supercharging a Passenger mentioning

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: Improvement In the Transient Driveabilitymentioning

confidence: 99%

Section: Challenges Of Conventional Supercharged Passenger Car Enginesmentioning

confidence: 99%

Section: Challenges Of Conventional Supercharged Passenger Car Enginesmentioning

confidence: 99%

“…As such, their findings were in line with those of Turner et al, who investigated the SuperGen electromechanical supercharger in a highly downsized compound-charged engine application. 49…”

Section: Potential Trends For Mechanically Supercharging a Passenger mentioning

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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“…The approximate power flow is shown for a mid-load condition. 35 vehicle and engine components that are traditionally mechanically driven. This, on one hand, will bring some fuel efficiency benefits as the electrically operated devices (such as the water pump and oil pump) can be operated in 'demand controlled' mode without any fixed mechanical drive; and, on the other hand, provides some second-order advantages, for example deletion of the FEAD to reduce the length of the engine and the capability of still operating during the engine-off condition.…”

Section: Additional Benefits Of the 48 V Electrical Systemmentioning

confidence: 99%

Progress and recent trends in 48 V hybridisation and e-boosting technology on passenger vehicles – a review

Chen²,

Zhan³

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Electrification of the powertrain system will play an important role in reducing fuel consumption and engine-out emissions in the next few decades. Compared to the pure electric and full hybrid concept, 48 V mild hybridisation and the accompanying 48 V e-boosting concept, due to their superior cost-benefit performance, may become mainstream for the next generation of fuel reduction measures. The mild hybrid system can realise advanced stop-start, active and passive engine-off coasting, braking recuperation, boost assistance, e-creeping and torque vectoring functions, and is thus deemed to give approximately 10-15% fuel consumption benefits in the New European Driving Cycle (NEDC); and the e-boosting concept, due to its capability for further downsizing and down-speeding, allows the engine operating points to be shifted into a more efficient area. A strong synergy between 48 V mild hybridisation and the 48 V e-boosting concept has been found after reviewing both technologies, and the trends for developing such a combined electrical system are also discussed. Together with more engine and vehicle component electrification, fuel efficiency could be further improved, although the interactions between these technologies are highly complex and need to be optimised at a system level.

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Magnetoresistive Sensoren für Weg-, Winkel-, Strom- und Feldmessung im Automobil

Slatter¹,

Manteuffel²

2016

Automobil-Sensorik

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SuperGen on Ultraboost: Variable-Speed Centrifugal Supercharging as an Enabling Technology for Extreme Engine Downsizing

Cited by 22 publications

References 8 publications

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

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

Progress and recent trends in 48 V hybridisation and e-boosting technology on passenger vehicles – a review

Magnetoresistive Sensoren für Weg-, Winkel-, Strom- und Feldmessung im Automobil

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