The effect of hydraulic circuit design and control on the efficiency of a continuously variable transmission


Vaughan, N.D., Gübeli, M. and Burrows, C.R., 1996. The effect of hydraulic circuit design and control on the efficiency of a continuously variable transmission. In: International Off-Highway and Powerplant Congress and Exposition, 1996-08-26 - 1996-08-28.

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As part of a larger programme of work on the integrated control of engine and transmissions a study has been made of the control aspects of the transmission with a detailed investigation of the hydraulic circuit. The requirements of the broader programme necessitated an electrical input for the transmission control and a test bed version was successfully modified with electro-hydraulic valves. Attention to detail in the design of the hydraulic circuit and the control of operating pressure can bring significant benefits to the transmission efficiency with consequent beneficial effects on fuel economy. This paper investigates several aspects of the components used and their effect on efficiency, in particular pump sizing. This investigation is illustrated with results from a computer simulation of the system. Possible improvements through a modified control strategy for the belt pressure are also proposed with steady state results obtained experimentally from the test bed transmission.


Item Type Conference or Workshop Items (Paper)
CreatorsVaughan, N.D., Gübeli, M. and Burrows, C.R.
Related URLs
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
ID Code35891
Additional InformationSAE Technical Paper No.961797


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