Optimisation of transient response of a gasoline engine with variable geometry turbine turbocharger

H. Tang, S. Akehurst, C. J. Brace, S. Garrett, L. Smith

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Maintaining transient torque response is challenging on turbocharged engines because of the period of time required to accelerate the turbocharger. Variable Geometry Turbine (VGT) turbochargers offer a route to improve the transient response. In order to explore the transient operation without any limitation imposed by the production control strategy, an on line search was conducted using a series of open loop actuator trajectories applied to a VGT turbocharger installed on a gasoline engine. The trade-off between the responses in different stages in the transient event has been illustrated. The time required to reach 50% of maximum torque rise (T50) was improved by up to 0.54s (35.5%) whilst the turbocharger acceleration was maintained. Fully closing the VGT resulted in high exhaust back pressure and low volumetric efficiency. This suggests that a simple boost pressure feedback control will likely not deliver optimised performance due to the excessive exhaust back pressure, reducing the available brake torque during the early part of the transient. Therefore, a model based control strategy may be required.

Original languageEnglish
Title of host publicationInstitution of Mechanical Engineers - 11th International Conference on Turbochargers and Turbocharging
PublisherWoodhead Publishing Ltd.
Pages163-175
Number of pages13
ISBN (Electronic)9780081000335
DOIs
Publication statusPublished - 29 Sep 2014
Event11th International Conference on Turbochargers and Turbocharging - London, UK United Kingdom
Duration: 13 May 201414 May 2014

Publication series

NameInstitution of Mechanical Engineers - 11th International Conference on Turbochargers and Turbocharging

Conference

Conference11th International Conference on Turbochargers and Turbocharging
Country/TerritoryUK United Kingdom
CityLondon
Period13/05/1414/05/14

ASJC Scopus subject areas

  • Automotive Engineering
  • Fuel Technology

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