This content is not included in your SAE MOBILUS subscription, or you are not logged in.
New Concepts for Control of Power Transients in Flywheel Assisted Drivelines with a CVT
Published June 12, 2000 by Society of Automotive Engineers of Korea in South Korea
Annotation ability available
Vehicle powertrains with a continuously variable transmission (CVT) have a large freedom in controlling the engine speed and the torque at the wheels. Due to rotating inertias within the engine and transmission, the response of the vehicle during large engine speed shifts may appear reluctant or even counteractive. To overcome this behaviour, the CVT is augmented with a planetary gear set and compact steel flywheel. The new transmission seamlessly combines two contradictive 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 can be achieved by cruising the vehicle at extremely low engine speeds which is possible by the large ratio-coverage of the CVT. The latently impassive pedal-to-wheel response that normally would emerge is now eliminated by the gear set and the flywheel. In this paper two control strategies for the engine throttle valve and the CVT ratio shift speed are presented and analysed. The control laws are able to realize high driveability and fuel economy at the same time. Results from simulations will be discussed.
- Alex F.A. Serrarens - Eindhoven University of Technology Fac. of Mechanical Engineering, Section Systems & Control P.O. Box 513, 5600 MB Eindhoven, The Netherlands
- Frans E. Veldpaus - Eindhoven University of Technology Fac. of Mechanical Engineering, Section Systems & Control P.O. Box 513, 5600 MB Eindhoven, The Netherlands
CitationSerrarens, A. and Veldpaus, F., "New Concepts for Control of Power Transients in Flywheel Assisted Drivelines with a CVT," SAE Technical Paper 2000-05-0128, 2000.
- Druten, R.M van, et al. 2000 Design and Construction aspects of a Zero Inertia CVT for Passenger Cars FISITA World Automotive Congress Seoul
- Ford 1997 http://www.uscar.org/techno/hyb_ford.htm
- Honda 1999 http://www.evworld.com/reports/hondavv.html
- McRuer, D. Krendel E. 1957 Dynamic response of human operators Columbus Wright Air Development Centre
- Pacejcka, H.B. Bakker, E. 1993 The Magic Formula Tyre Model, Vehicle System Dynamics 21 Proceedings 1st International Colloquium on Tyre Models for Vehicle Dynamics Analysis
- Serrarens, A.F.A. Veldpaus, F.E. Kok J.J. 1999 Powertrain Control of a Flywheel Assisted Driveline with CVT CVT'99 Congress Eindhoven, The Netherlands
- Spijk, G. van Veenhuizen, B. 1998 An upshift in CVT efficiency VDI Berichte Nr. 1393
- Vroemen, B.G. 2000 Control of a CVT in a Flywheel Assisted Driveline FISITA World Automotive Congress Seoul