Chain converter types of transmissions today can be found in modern passenger cars as well as in applications for industrial use and in land or marine navigation. Different applications lead to different requirements for the control of the continuously variable transmission (CVT). The pull type chain variator has been subject of research projects at the Department of Agricultural Machinery of Technische Universität München for tractors and passenger cars. Results have been presented together with the presentation of the 'Autarkic Hybrid', a common large research project of several departments. In order to provide fast, comfortable and successful range shifts it is essential to exactly control the speed ratio at synchronous points. When controlling the speed ratio not only in one single point, but over the whole range of spreading, a controller, a variable instructor, has proved itself in different CVT applications. This new adaptive controller for chain converters for universal use in different applications and set-ups is being presented in this paper. The underlying disturbance feedforward control which already took into account the disturbance variables torque and speed was extended by an additional dimension in order to cover the whole spreading of the transmission. Moreover an adaptation of the influence of the disturbance variables was implemented in order to fit different gearbox designs and clamping strategies. At the end an open loop control of the rate of speed ratio change becomes possible which might be useful for some applications.
Control and operating behavior of continuously variable chain transmissions
Adaptivregelung eines stufenloses Kettengetriebes
2003
6 Seiten, 6 Bilder, 8 Quellen
Conference paper
English
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