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Instrumented Infinitely Variable Transmission for Instruction

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2011 Louisville, Kentucky, August 7-10, 2011  1110742.(doi:10.13031/2013.37293)
Authors:   Josh J Heber, Dennis R Buckmaster
Keywords:   Controller area network, education, efficiency, electro-hydraulic, hydraulic, infinitely variable transmission, laboratory, trainer

An infinitely variable transmission (IVT) for instructional purposes was designed and built. It was an input-coupled power split transmission with a hydrostatic transmission used as the variable unit. The IVT cart was built to connect to a dynamometer for output power, torque, and speed measurement. With instrumentation for input torque and speed as well as hydraulic oil pressures, temperature, and pump swash plate position, all variables and parameters can be displayed through the controller area network system’s display; with a personal computer connected, data logging can be accomplished easily. Example laboratory handouts were created to streamline instruction and assess comprehension of IVT concepts, hydrostatic circuits, and control algorithms. A 6.2 kW diesel engine powers the IVT with timing belts and pulleys transferring power between the hydrostatic transmission and the input and output. A 3:1 planetary gear set collects power at the output. The hydrostatic transmission has a variable pump and fixed motor with displacements of 21 cc per revolution. The maximum allowable pressure in the hydrostatic transmission is 145 bar as set by the cross-port relief valves. The output speed of the transmission is infinitely variable between approximately 20 and 2500 rpm for an input speed of 3800 rpm. The maximum output torque of the IVT is 105 Nm -- limited by hydraulic pressure and pump and motor displacement.