A New De-throttling Concept in a Twin-Charged Gasoline Engine System

Hu, Bo; Copeland, Colin; Lu, Pengfei; Akehurst, Sam; Brace, Chris; Turner, J. W. G.; Romagnoli, Alessandro; Martinez-Botas, Ricardo

doi:10.4271/2015-01-1258

Cited by 11 publications

(16 citation statements)

References 8 publications

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“…An example is given here to explain why the consolidated point method (termed Minimap methodology in some of the literature 10,49,74,80,92 ) and the kinematic mode cannot reproduce the boost system transient response and cannot exhibit the real fuel economy in a driving cycle for comparing boosted engines with different transient performances. 66 During a vehicle acceleration event, the transient performance of the engine influences the driver’s pedal demand, which can further cascade to the transmission shifts event.…”

Section: Modelling Methodologiesmentioning

confidence: 99%

“…It seems that parasitic losses always exist even though the drive ratio and the transmission efficiency can be further improved. However, Hu et al 92 first proposed a novel concept to eliminate parasitic losses completely at part-load without the use of a clutch. They extrapolated the test data seen in Figure 18 and Figure 19 and imported the data into their twin-charged gasoline model.…”

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: Modelling Methodologiesmentioning

confidence: 99%

Section: Potential Trends For Mechanically Supercharging a Passenger mentioning

confidence: 99%

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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“…If the literature [28][29][30][31][32][33] is compared with the e-boosting configuration, it seems that there will be an additional potential benefit of the e-boosting device if the drive motor of the compressor is run in the 'generator mode'. This is realised in the following scenarios:…”

Section: E-boosting Technologymentioning

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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“…Variable speed supercharging can be achieved easily through electrical supercharging. Although several attempts have been reported to use electrical roots type superchargers to retrieve otherwise wasted throttling losses [6,7], recovering the fuel penalty associate with supercharger consumed electricity is not easy. Considering this fact, electrical supercharging seems to be a good option for transient performance improvement and for enabling high fuel economy concepts such as highly diluted combustion.…”

Section: Dscc2016-9691mentioning

confidence: 99%

A Coordinated Boost Control in a Twincharged Spark Ignition Engine With High External Dilution

Nazari

Stefanopoulou

Kiwan

et al. 2016

Volume 2: Mechatronics; Mechatronics and Controls in Advanced Manufacturing; Modeling and Control of Automotive Systems and Com

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This paper proposes a novel master-slave control strategy for coordination of throttle, wastegate and supercharger actuators in an electrically twincharged engine in order to guarantee efficient boost control during transients, while at steady state a throttle-wastegate coordination provides minimum engine backpressure hence engine efficiency elevation. The benefits and challenges associated with Low Pressure Exhaust Gas Recirculation (LP-EGR) in a baseline turbocharged engine, including improved engine efficiency, mainly due to better combustion phasing, and sluggish engine response to a torque demand due to slowed down air path dynamics were studied and quantified in [1]. Hence in this paper an electrical Eaton TVS roots type supercharger at high pressure side of the turbocharger compressor (TC compressor) is added to the baseline turbocharged engine and the performance of the proposed controller in the presence of LP-EGR, which is a more demanding condition, is evaluated and compared to the turbocharged engine. One dimensional (1D) crankangle resolved engine simulations show that the proposed master-slave control strategy can effectively improve the transient response of the twincharged engine, making it comparable to naturally aspirated engines, while the consumed electrical energy during transients can be recovered from the decreased fuel consumption due to LP-EGR conditions at steady state in approximately 1 second. Finally, a simple controller is developed to bypass the TC compressor and maximize the engine feeding charge during the transients in order to avoid TC compressor choking and achieve faster response.

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A New De-throttling Concept in a Twin-Charged Gasoline Engine System

Cited by 11 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

A Coordinated Boost Control in a Twincharged Spark Ignition Engine With High External Dilution

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