Modelling the performance of a continuously variable supercharger drive system

Rose, Adam T J M; Akehurst, Sam; Brace, Chris

doi:10.1177/0954407011406320

Cited by 13 publications

(11 citation statements)

References 19 publications

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“…It is a lower-speed machine and can therefore have a simple drive system to the crankshaft; it also has air consumption characteristics similar to those of a typical internal-combustion engine. 38…”

Section: The Fundamentals and The Types Of Superchargermentioning

confidence: 99%

“…Their drawback lies in the fact that the supplied boost increases with the square of the rotational speed, resulting in a low boost at low engine speeds. 38 This is ideal in aircraft and marine engines, which are commonly matched to a propeller, 32 but not for an automotive engine which uses far more of its operating map. Furthermore, pressurisation requires high tip speeds and therefore, in order to provide sufficient boost, centrifugal superchargers usually need to be driven by some form of step-up gearing which inevitably incurs some additional mechanical losses.…”

Section: The Fundamentals and The Types Of Superchargermentioning

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%

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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“…A 1.4 L Twin-charger Stratified Injection (TSI) engine could have the same output power as a 2.31 L Natural Aspiration (NA) engine, but the fuel consumption was increased [12]. The system structure adopted a roots-type supercharger and a turbocharger in series.…”

Section: Introductionmentioning

confidence: 99%

“…The engine will demand high flow rates and compression ratios at high altitudes. This means much more size and weight increment for the roots-type supercharger [12]. Compared to the roots-type supercharger, the centrifugal supercharger is much smaller and more efficient.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Performance of a New Speed Adjustable Compound Supercharging Diesel Engine Working under Plateau Conditions

et al. 2017

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Abstract:In order to improve the diesel engine performance under plateau (high altitude) conditions, a new Speed Adjustable Compound (SAC) supercharging method is proposed. A simulation model based on a six-cylinder V-type turbocharged intercooler diesel engine is built on the GT-POWER platform, and then simulation-based research is carried out. A genetic algorithm (GA) is used to identify the best operation parameters, including the supercharger speed and fuel injection quantity under steady state conditions. Transient performance is obtained through starting process simulation of a vehicle with SAC engine on the MATLAB/Simulink GT-POWER co-simulation platform. Both the steady and transient performance of the SAC engine are compared with those of the original engine. Results show that the torque of the SAC engine at full load is significantly increased when the engine speed n < 1600 r/min. The increment of the maximum torque can reach up to 31% at 1000 r/min compared to that of the original engine, while the peak torque is increased by 9%. The fuel consumption deterioration is restricted within 5%. What's more, the SAC engine can help reducing the acceleration time by 20% during tip-in pedal events during the vehicle starting process.

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“…There are works on drive systems as reported by Fenina et al (2008), vehicle transmission by Popovic et al (2012), Rose (2011), on shafts by Croccolol and Vincenzil (2009) and Paynter et al (2009) and Cao et al (2009) and Sun et al (2009). However there are a few papers of direct relevance to hub, rim and drum.…”

Section: Introductionmentioning

confidence: 99%

Design analysis of Hub, Rim and Drum in Brake Assembly

Ramamurti¹,

T²,

Mithun³

et al. 2013

MER

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Stress analysis connected with the brake assembly of heavy vehicles is a complicated problem in view of the machine elements involved. The hub (on the rear axle), the rim (holding the wheel) and the drum (holding the brake shoe) experience severity of loads. While the vehicle is being driven the power is transmitted from the hub to the rim. When the brake is applied, the brake drum receives the braking torque and communicates it to the rim. Analysis associated with braking is actually transient since the braking torque varies with time in a short period of time whereas the one associated with driving is predominantly steady while the vehicle moves with uniform speed. None of them can be considered rotationally symmetric. Even though 3D brick element can be used for modelling all the three members, the computational effort needed to handle the problem of braking becomes extremely cumbersome. Hence a compromise solution is presented in this paper.Keywords: drum brake, design analysis, input forces, finite element application, 3D brick, axisymmetric concept

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Modelling the performance of a continuously variable supercharger drive system

Cited by 13 publications

References 19 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

Modeling the Performance of a New Speed Adjustable Compound Supercharging Diesel Engine Working under Plateau Conditions

Design analysis of Hub, Rim and Drum in Brake Assembly

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