This content is not included in your SAE MOBILUS subscription, or you are not logged in.
The Effect of Hydraulic Circuit Design and Control on the Efficiency of a Continuously Variable Transmission
ISSN: 0148-7191, e-ISSN: 2688-3627
Published August 01, 1996 by SAE International in United States
Annotation ability available
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.
CitationVaughan, N., Gübeli, M., and Burrows, C., "The Effect of Hydraulic Circuit Design and Control on the Efficiency of a Continuously Variable Transmission," SAE Technical Paper 961797, 1996, https://doi.org/10.4271/961797.
- Kalkert, W. Eggert, U. 1988 Field Experience and Further Developments of Control Systems for CVTs in Passenger Cars SAE 885061 FISITA '88 Dearborn, Michigan September 25-30 1988
- Abromeit, G. Wilkinson, A.C.N. 1984 An electronic control concept for a continuously variable transmisison ISATA 1984 Milan
- Engels, H.R. Main, J.J. 1985 Motorentechnische Zeitschrift 46 12 481 487
- Guo, Z.Y. Yang, X.C. Yang, D. Frank, A.A. 1988 On obtaining the best fuel economy and performance for vehicles with engine-CVT transmissions SAE 881735
- Deacon, M. Brace, C.J. Gübeli, M. Vaughan, N.D. Burrows, C.R. Dorey, R.E. 1994 A modular approach to the computer simulation of a passenger car powertrain incorporating a Diesel engine and CVT Control '94, IEE 320 325 Warwick March 1994
- Seidel, W. Petersmann, J. Hickmann U. Möllers W. 1992 Adaptive control system for continuously variable transmission (CVT) IMechE C389/328 SAE 925062
- Schwab, M. 1990 Electronically controlled transmission systems - current position and future developements SAE 901156
- Narumi, N. Suzuki, H. Sakakiyama, R. 1990 Trands of powertrain control SAE 901154
- Gieles, W.T.M. 1989 Electronic control of continuously variable transmission and its extension to engine transmission management IMechE C382/048
- Hendriks, E. Heegde, ter P. Prooijen, van T. 1988 Aspects of a metal Pushing V-Belt for Automotive Cut Application SAE paper 881734 1988 Passenger Car Meeting and Exposition Dearborn, Michigan 31 Oct. 3 Nov.
- Hendriks, E. 1993 Qualitative and quantitative influence of fully electronically controlled CVT on fuel economy and vehicle performance SAE 930668
- Röper, H. 1987 Antrietstechnik 26 8
- Vaughan, N.D. Gubeli, M. Burrows, C.R 1994 Fuel economy benefits with effective powertrain control IMechE 9th Int Conf on Automotive Electronics May 1994
- Micklem, J.D. Longmore, D.K. Burrows, C.R. 1994 Modelling of the steel pushing V-belt, continuously variable transmission Proc IMeehE 208 13 27 1994
- Tilley, D.G. Richards, C.W. Tomlinson, S.P. Burrows, C.R. 1991 Role of simulation in the design of fluid power systems IFAC Symp CAD in Control Systems July 1991
- Micklem, J.D. Longmore, D.K. Burrows, C.R. 1994 Belt torque loss in a steel V-belt, continuously variable transmission Proc IMechE 208 91 97 1994
- Becker, H.J. 1987 457
- Gerbert, G. 1984 Metal V-belt mechanics ASME 84-DET-227
- Sun, D.C. 1988 Performance analysis of a variable speed-ratio metal V-belt drive Transmissions and Automation in Design 110 472 481
- McCandlish, D. Dorey, R.E. 1984 The mathematical modelling of hydrostatic pumps and motors Proc IMechE vol. 198B 10