Title: A modern concept for the digital control of hydraulic gears

Authors: W. Marner, M. Ulm

Addresses: University of Duisburg, West Germany. ' University of Duisburg, West Germany

Abstract: The paper describes a new concept for the speed control of a vehicle by means of an infinitely variable hydraulic gear. The hydraulic gear consists of a central pressure generating unit, a pressure lining system and several hydraulic motors. The speed is controlled by a variation of the motor displacement (secondary control). The mathematical background of the gear system and the proposed control concept is presented. Experimental results derived for a pilot plant are discussed.

Keywords: hydraulic gears; motor displacement; secondary controlled hydraulic drives; transmission capabilities; wheel-ground interaction; speed control; vehicle design.

DOI: 10.1504/IJVD.1989.061549

International Journal of Vehicle Design, 1989 Vol.10 No.5, pp.560 - 580

Published online: 26 May 2014 *

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