The effect of VGT vane control on pumping losses during full-load transient operation of a common-rail diesel engine

Black, John D.; Eastwood, P G; Tufail, Khizer; Winstanley, T; Hardalupas, Y.; Taylor, A. M. K. P.

doi:10.4271/2007-24-0063

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…It has been suggested that exhaust gas pulsation is damped at low vane positions. 10,24 Indeed, many authors have found this damping effect on diesel VGT turbochargers, 22,45,46 which can result in increased residual gas concentration, turbine inlet temperature and pumping losses. 3 In addition, Eichhorn et al 10 state that the exhaust gas pulsation can also be distorted due to the large space between the nozzles and the turbine wheel.…”

Section: Challenges Of Gasoline Vgt Applicationmentioning

confidence: 99%

“…66 In addition, it has been highlighted on diesel engines that the VGT turbocharger can provide further opportunities to control the EGR rate. 45 This is a result of the relatively low efficiency of the VGT turbocharger at the near fully closed position. The EGR flow is thus driven by the differential pressure between the exhaust manifold and inlet manifold.…”

Section: Downsized Gasoline Enginesmentioning

confidence: 99%

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A review of the application of variable geometry turbines to the downsized gasoline engine

Tang

Pennycott

Akehurst

et al. 2014

International Journal of Engine Research

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Engine downsizing through turbocharging is a proven method of improving fuel economy by using a smaller engine operating at higher levels of specific engine load and higher efficiency. Turbocharging is more challenging for the gasoline engine than the diesel engine due to the higher variability in the flow rate of air and the higher exhaust gas temperature. Although the variable geometry turbine offers the potential for improving the low-end torque, lowering part-load fuel consumption and delivering a fast transient response on a downsized gasoline engine, the cost, durability and the limited allowable turbine inlet temperature on the currently available devices present challenges to widespread application. This article details the main operating principles and types of the variable geometry turbine, its potential to deliver performance improvements, implementation challenges on the gasoline engine and the measures available to alleviate those challenges. Of the available types of variable geometry turbine, the variable nozzle form has the highest efficiency over a wide flow range while the variable flow and sliding wall types have better reliability and lower cost. Using additional technologies such as the water-cooled exhaust manifold, specialist turbocharger materials, exhaust gas recirculation and novel combustion systems in combination with advanced control strategies will facilitate variable geometry turbine application and hence allow further downsizing of the gasoline engine.

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Section: Challenges Of Gasoline Vgt Applicationmentioning

confidence: 99%

Section: Downsized Gasoline Enginesmentioning

confidence: 99%

A review of the application of variable geometry turbines to the downsized gasoline engine

Tang

Pennycott

Akehurst

et al. 2014

International Journal of Engine Research

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“…Black et al [13] have evaluated how VGT control strategy influences pumping losses and specific fuel consumption during transient engine operation. They used an experimental matrix based on comparing load transients with different rise time and VGT positions in order to identify the influence of the different parameters involved.…”

Section: Transient Controlmentioning

confidence: 99%

A study of combustion and emission formation characteristics during production engine transients using optical diagnostics

Lindström

Westlund

Ångström

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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In order to identify some of the special combustion and emission formation phenomena that occur in a turbocharged heavy-duty diesel engine during transient operation, the transient strategy of a production engine has been characterized at four different engine speeds. From each transient some points have been selected for further investigation by recreating these load points as steady-state points in a single-cylinder engine. This allows the emissions to be measured with a high degree of accuracy. An endoscope which makes it possible to evaluate flame temperatures was used in both engines. An empirically derived method of calculating nitric oxide (NO) formation from a combination of measured flame temperature, calculated gas temperature, and heat release rate has been developed and applied. This provides an increased understanding of combustion and emission formation phenomena during transient operation. An optical engine was also used to provide a full combustion chamber view for some of the operating points, and a specially developed software was used to calculate temperature distributions based on high-speed camera colour information. The NO formation formula was applied on these images, which resulted in spatially resolved NO formation distributions.

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“…The common monitoring parameters for turbochargers are the oil pressure, turbine inlet gas temperature, compressor outlet temperature and rotating speed. 10,11 When the turbocharger deteriorates, the engine control unit (ECU) can manage the turbocharger operation by VGT vane position 12 or waste-gate, 13 offsetting the problem and reaching the inlet pressure required but hiding any degradation that may gradually have the turbocharging system.…”

Section: Introductionmentioning

confidence: 99%

A methodology to study oil-coking problem in small turbochargers

Serrano

Tiseira

García-Cuevas

et al. 2018

International Journal of Engine Research

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In compliance with oncoming emission directives, turbocharging and increasing complexity in the turbocharger system demands a great effort from researchers on the development of effective procedures and tools to cope with the new technological exigencies. This article describes a methodology for studying oil-coking influence in turbocharger performance. A preliminary evaluation and calibration is done. The aim of this work focuses on the development of methodologies and tools that help to evaluate and understand the consequences that degraded oils can generate in the bearing system during enhanced oil-coking procedure. Several experimental tests have been carried out in an engine test bench and using an independent lubrication system that only feeds the turbocharger. The test campaign is done under a specific engine cycle and using oil artificially contaminated at two different levels. The work is divided into two parts. The first part provides a description and definition of test conditions for measuring of the maximum temperature in the bearing system and the second part tackles the measurement and post-processing of the main instantaneous parameters defining the engine and turbocharger behavior.

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The effect of VGT vane control on pumping losses during full-load transient operation of a common-rail diesel engine

Cited by 6 publications

References 27 publications

A review of the application of variable geometry turbines to the downsized gasoline engine

A review of the application of variable geometry turbines to the downsized gasoline engine

A study of combustion and emission formation characteristics during production engine transients using optical diagnostics

A methodology to study oil-coking problem in small turbochargers

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