Transient Investigation of Two Variable Geometry Turbochargers for Passenger Vehicle Diesel Engines

Brace, Chris; Cox, A.; Hawley, J G; Vaughan, N. D.; Wallace, F. W.; Horrocks, R. W.; Bird, Guy

doi:10.4271/1999-01-1241

Cited by 17 publications

(7 citation statements)

References 3 publications

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“…This is accomplished by analysing data from thousands of engine cycles using a standard gaseous emissions bench. The air/ fuel ratios for these cycles are determined by including CO and HC emissions with equation ( 8) and then calculating the air/fuel ratios when CO and HC emissions are neglected with equation (9). For all the cycles investigated, the average error in air/fuel ratio calculation is 1.02 per cent.…”

Section: Measurement Error and Sensitivity Analysismentioning

confidence: 99%

“…The formation of particulates and NO x in diesels is extremely complex [4][5][6][7]. Generating experimental insight into dynamic engine behaviour has been particularly challenging [8][9][10][11][12][13][14][15][16]. Hence, while the relevance of emissions formation during transients has been recognized, the availability of scientific data pertaining to this issue is limited.…”

Section: Introductionmentioning

confidence: 99%

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Cycle-resolved measurements of in-cylinder constituents during diesel engine transients and insight into their impact on emissions

Hagena

Assanis

Filipi

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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Diesel engine transients, in particular the rapid increase of load from idle, lead to significant excursions of operating parameters from normal, steady-state operation. A typical transient event is initiated by a sudden increase of fuelling followed by a turbo lag period. The trajectories of key parameters, such as boost pressure, air/fuel ratio, and amount of residual in the cylinder, depend on the complex interplay between the control system behaviour, actuator response, and time scales of physical processes. The end result is a significant deviation of the combustion event and emission formation. For example, it has been shown that transient spikes of soot may be responsible for up to half of total particulate emissions during a city driving cycle. The present paper introduces an experimental technique to quantify cycle-resolved pre-combustion in-cylinder constituents during transient engine operation and uses measurements to generate insight into mechanisms that cause increased emissions during a diesel engine transient event. A 6.0-litre V-8 diesel engine is instrumented for fuel injector needle lift and injection pressure measurements, cylinder pressure, simultaneous fast measurements of CO2 concentrations in the exhaust and in the cylinder, and fast measurements of NO and particulate spectrum. Analytical techniques are introduced to process measurements and determine cycle-resolved mass of fuel, air, and stoichiometric combustion products, thus providing insight into reasons for significant variations of emission during the transient. The technique is utilized to study engine behaviour over an FTP-72 driving cycle.

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Section: Measurement Error and Sensitivity Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cycle-resolved measurements of in-cylinder constituents during diesel engine transients and insight into their impact on emissions

Hagena

Assanis

Filipi

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The transient performance of variable-geometry turbochargers was investigated by Lundstrom and Gall (1986), Pilley et al (1989), Brace et al (1999), and Filipi et al (2001). Dynamic optimization and the differences between the steady-state and transient conditions were researched by Wijetunge et al (1999).…”

Section: Turbocharged Diesel Engine Transient Performancementioning

confidence: 99%

Diesel engine system dynamics, transient performance, and electronic controls

Xin¹

2013

Diesel Engine System Design

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“…To reduce such deterioration, new technologies such as the additional mechanical supercharging system [3], twin turbo system [4,5], turbocharger power assist system [6], variable geometry turbo charger system [7][8][9][10], and variable flow turbocharger [11] have been proposed in recent years.…”

Section: Introductionmentioning

confidence: 99%

High pressure air spray assistant power supply control strategies and their effects on diesel engine under transient operations

Han

Liu

Wang

et al. 2007

Front. Energy Power Eng. China

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In order to reduce smoke from direct-injection (DI) turbo-charged and after-cooled (TCA) diesel engines under transient operations, the real-time controlling and measuring system of a high pressure air spray assistant power supply (HPAS) was developed. Effects of HPAS on a DI TCA diesel engine under constant engine speed and increased torque (CSIT) transient operations were studied by using different control strategies. Pre-spray (PS) strategy, which means supplying highly pressurized air into the exhaust manifold two seconds before the accelerating-graph begins to rise and stopping spraying air when the acceleratinggraph stops rising. Two other strategies-full-time-spray (FTS) and middle-time-spray (MTS)-were used to fully exploit HPAS potential. With the FTS and MTS strategies, the HPAS system can remarkably decrease smoke from DI TCA diesel engines under transient operations.

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Transient Investigation of Two Variable Geometry Turbochargers for Passenger Vehicle Diesel Engines

Cited by 17 publications

References 3 publications

Cycle-resolved measurements of in-cylinder constituents during diesel engine transients and insight into their impact on emissions

Cycle-resolved measurements of in-cylinder constituents during diesel engine transients and insight into their impact on emissions

Diesel engine system dynamics, transient performance, and electronic controls

High pressure air spray assistant power supply control strategies and their effects on diesel engine under transient operations

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