This paper has analysed the system dynamics of a simple CVT system. The technique employed in this research is the unified bond graph approach. It has the convenience of constructing the mathematical model from the mechanical configuration directly. A set of dynamic equations of state variables, representing the energy flow of the powertrain system, were established. A computer programm based on the Matlab platform has been written to solve the equation set. The steady-state results reveal that the CVT reduction ratio is a function of the input engine speed and the load torque fed back from the road condition. The reduction ratio ranges from 0.4 to 2.8. The step response test shows that the CVT system has a time lag, which is owing to the pre-load compression spring in the driven pulley. Frequncy response simulation has been carried out to draw the Bode diagram. The diagram concludes that the bandwith of this CVT system is 2 Hz, and the dynamics can be simplified as a 'first to second' order system. This information is important for future electronic control implementation to this CVT system.
Bond graph dynamics of a rubber-belt continuously variable transmission
Dynamik eines CVT-Getriebes (Keilriementrieb) mit Hilfe des graphischen Bond-Verfahrens
International Journal of Vehicle Design ; 35 , 4 ; 383-398
2004
16 Seiten, 13 Bilder, 1 Tabelle, 8 Quellen
Article (Journal)
English
Anwendung im Fahrzeugbau , mathematisches Modell , CVT-Getriebe , Fahrzeuggetriebe , dynamisches Verhalten , Frequenzgang , Bode-Diagramm , dynamisches System , graphisches Verfahren , Keilriementrieb , Keilriemen , Motorroller , Drehzahlregler , Drehmomentregler , Anwenderprogramm , Systemeigenschaft , Antriebstechnik , Fahrzeugantrieb , Drehzahlbereich , Übersetzung (Getriebe) , Übersetzungsverhältnis , elektronische Steuerung
Bond graph dynamics of a rubber-belt continuously variable transmission
Automotive engineering | 2004
|Bond graph dynamics of a rubber-belt continuously variable transmission
Online Contents | 2004
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