A new CVT powertrain without jet start behaviour : analysis of design, dynamics and control

A.F.A. Serrarens, B.G. Vroemen, F.E. Veldpaus

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

1 Citation (Scopus)
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Abstract

Due to rotating inertias within the engine and transmission, the response of a vehicle during large engine speed shifts may appear reluctant or even counteracting. Reminiscent of comparable behaviour seen in aircraft jet-propulsion, this phenomenon is also referred to as 'jet-start'. To overcome this behaviour, a CVT powertrain is augmented with a planetary gear set and compact steel ywheel. The new transmission seamlessly combines two contradictory features: the driveability in terms of the pedal-to-wheel response is greatly improved and a large leap towards optimal fuel economy can be made. This is achieved by cruising the vehicle at extremely low engine speeds, using the large ratio-coverage of the CVT. The ywheel acts as a 'peak shaver' during speed shifts: it delivers power during engine acceleration and absorbs kinetic energy during engine decelerations. In this paper, optimal design, system dynamics and control aspects of the new powertrain are discussed.
Original languageEnglish
Title of host publicationSelected papers from the 20th international congress of theoretical and applied mechanics : held in Chicago, 28 August - 1 September 2000 /
Place of PublicationAmsterdam
PublisherSwets & Zeitlinger
Pages181-205
ISBN (Print)90-265-1812-9
Publication statusPublished - 2001

Publication series

NameVehicle system dynamics
Volumesuppl.35
ISSN (Print)0042-3114

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