Transient investigation of two variable geometry turbochargers for passenger vehicle diesel engines

C.J. Brace, A. Cox, J.G. Hawley, N.D. Vaughan, F.W. Wallace, R.W. Horrocks, G.L. Bird

Research output: Contribution to conferencePaperpeer-review

11 Citations (SciVal)


The use of variable geometry turbocharging (VGT) as an aid to performance enhancement has been the subject of much interest for use in high-speed, light-duty automotive diesel applications in recent times (4). One of the key benefits anticipated is the improved transient response possible with such a device over the conventional fixed geometry turbine with wastegate. The transient responses of two different types of variable geometry turbocharger have been investigated on a dynamic engine test bed. To demonstrate the effect of the turbocharger on the entire system a series of step changes in engine load at constant engine speed were carried out with the turbocharger and exhaust gas recirculation (EGR) systems under the control of the engine management microprocessor. Results are presented which compare the different performance and emissions characteristics of the devices. Some control issues are discussed with a view to improving the transient response of both types. Of particular importance is the interaction between the turbocharger system and the EGR system.
Original languageEnglish
Publication statusPublished - 1999
EventInternational Congress and Exposition - Detroit, MI , USA United States
Duration: 1 Mar 19994 Mar 1999


ConferenceInternational Congress and Exposition
Country/TerritoryUSA United States
CityDetroit, MI

Bibliographical note

SAE Technical Paper 1999-01-1241


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