Vehicle Level Parameter Sensitivity Studies for a 1.5L Diesel Engine Powered Passenger Car with Various Boosting Systems

Biller, Brandon; Wetzel, Philip; Chandras, Pavan; Keidel, Sean

doi:10.4271/2015-01-0982

Cited by 4 publications

(6 citation statements)

References 5 publications

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Section: Discussionmentioning

confidence: 99%

“…In the meantime, due to the faster transient behaviour, an optimized transmission gear ratio or shifting strategy could be implemented, achieving down-speeding in order to improve fuel efficiency, shifting frequency and driveability. [33][34][35] The trade-off between part load BSFC and transient performance For a positive-displacement device, a larger pulley ratio will enhance the engine's transient response while compromising some of the partial load BSFC, especially at the just boosted condition. In addition, a larger pulley ratio could also make the compressor over-speed at lower engine speeds, thus affecting the driveability consistency at high engine speeds.…”

Section: Driving Cycle Fuel Efficiency Improvement By Further Downsizmentioning

confidence: 99%

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Experimental analysis of the V-Charge variable drive supercharger system on a 1.0 L GTDI engine

Akehurst

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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A compound charging system that pairs a turbocharger with a supercharger seems to be a potential trend for future passenger car gasoline engines, as the strength of both could be enhanced and the deficiencies of each could be offset. The use of a fixed-ratio positive-displacement supercharger system on a downsized turbocharged gasoline engine has already appeared on the market. Although such systems can achieve enhanced low-end torque and improved transient response, several challenges still exist. An alternative solution to the fixed-ratio positive-displacement supercharger is the V-Charge variable ratio centrifugal supercharger. This technology utilizes a Torotrak continuously variable transmission (CVT) coupled to a centrifugal compressor for near silent boosting. With a wide ratio spread of 10:1 and rapid rate of ratio change, the compressor speed can be set independently of the engine speed to provide an exact boost pressure for the required operating points, without the need to recirculate the air through a bypass valve. A clutch and an active bypass valve can also be eliminated, due to the CVT capability to down-speed, thus improving the noise vibration and harshness performance. This paper will, for the first time, present and discuss the V-Charge technology optimization and experimental validation on a 1.0 L GTDI engine to achieve a better brake specific fuel consumption and transient response over the turbo-only and the fixed-ratio positive-displacement supercharger solution. The potential for the V-Charge system to increase the low-end torque and enable a down-speeding strategy is also discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Driving Cycle Fuel Efficiency Improvement By Further Downsizmentioning

confidence: 99%

Experimental analysis of the V-Charge variable drive supercharger system on a 1.0 L GTDI engine

Akehurst

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…A recent trend in vehicle simulations is adopting a model-based feedforward dynamic solution with a corrective feedback loop (PI gains) to follow driving-cycle speed targets accurately. 110 Because the PI controller of a dynamic solution is used to correct only small errors that exist, the simulation speed is significantly increased. It should be noted that a fully developed dynamic model should incorporate dynamic modules for both the vehicle and the driveline.…”

Section: Modelling Methodologiesmentioning

confidence: 99%

“…A fast-running model may need to be used in this case to save some simulation time. 110 This is, in essence, achieved by lumping pipe objects together on the intake side and the exhaust side of a detailed engine model. Although this method cannot represent the higher-frequency wave dynamic content, a high level of fidelity of the low-frequency and primary-engine-order dynamics is maintained, which is normally of interest to transient simulations.…”

Section: Modelling Methodologiesmentioning

confidence: 99%

“…108 In addition, the effects of the down-speeding and the transmission shift frequency on the fuel efficiency may be able to be simulated only in this mode for different boosting solutions 69 which, in contrast with the conventional engine-map-based vehicle models, has the capability to model transient phenomena such as the turbo-lag during drive-away and gear shifts. 110…”

Section: Modelling Methodologiesmentioning

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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Engine Downsizing; Global Approach to Reduce Emissions: A World-Wide Review

Namar

Jahanian

Shafaghat

et al. 2021

HighTech. Innov. J.

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Engine downsizing is a promising method to reduce emissions and fuel consumption of internal combustion engines. The main concept is reducing engine displacement volume keeping needed output characteristics unchanged. The issue became one of the most filed of interest in recent years after the International Energy Agency defined a target of 50 % reduction in global average emissions by the year 2030. In this review paper, different aspects of researchers’ efforts on engine downsizing are configured and due to overlaps, categorized into five main areas. Each category is discussed thoroughly and recent works are pointed. The global attention into these categories, countries involved and the trend changed in recent four years are presented in details. Doi: 10.28991/HIJ-2021-02-04-010 Full Text: PDF

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Vehicle Level Parameter Sensitivity Studies for a 1.5L Diesel Engine Powered Passenger Car with Various Boosting Systems

Cited by 4 publications

References 5 publications

Experimental analysis of the V-Charge variable drive supercharger system on a 1.0 L GTDI engine

Experimental analysis of the V-Charge variable drive supercharger system on a 1.0 L GTDI engine

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

Engine Downsizing; Global Approach to Reduce Emissions: A World-Wide Review

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