The design of a new controller for the variator in a pushbelt continuously variable transmission (CVT) is investigated. A conventional variator controller is typically based on a variator model with large uncertainties, which results in a limited variator efficiency. The proposed controller simultaneously optimizes the variator efficiency and tracks a transmission ratio reference, for which a detailed variator model is not required. The controller, a combination of extremum seeking control and tracking control, only uses measurements from standard sensors. Experiments on the basis of a driving cycle show that a conventional variator controller is outperformed.
van der Meulen, S., de Jager, A. G., Veldpaus, F. E., & Steinbuch, M. (2014). Combining extremum seeking control and tracking control for high-performance CVT operation. Control Engineering Practice, 29, 86-102. https://doi.org/10.1016/j.conengprac.2014.02.013