This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Modeling, Simulation, and Control Implementation for a Split-Torque, Geared Neutral, Infinitely Variable Transmission
Annotation ability available
Sector:
Language:
English
Abstract
Split-torque, geared-neutral transmissions have been shown to improve vehicle performance over a conventional continuously variable transmission. Although control of these transmissions has presented significant problems in the past, we have been able to achieve good driveability and fuel economy through the use of an integrated engine/transmission control philosophy.
Development of the transmission/engine control strategies are based on detailed dynamic models and computer simulations of the driveline. In developing the control laws, specific attention has been given to providing characteristics similar to that of a conventional automatic transmission, such as creep and hill-holding capabilities.
Test results show adequate transmission response with high initial jerk if demanded, excellent stability at the geared-neutral point, and smooth transitions through the synchronous point as well as in all other driving conditions.
Recommended Content
Authors
Topic
Citation
Vahabzadeh, H. and Linzell, S., "Modeling, Simulation, and Control Implementation for a Split-Torque, Geared Neutral, Infinitely Variable Transmission," SAE Technical Paper 910409, 1991, https://doi.org/10.4271/910409.Also In
References
- Macey, J. P. Vahabzadeh, H. “Geared-Neutral Continuously Variable Transmission,” February 24 1987
- Vahabzadeh, H. Macey, J. P. Dittrich, O. “A Split-Torque, Geared-Neutral Infinitely Variable Transmission Mechanism,” FISITA Paper 905089 May 1990
- Ironside, J. M. Stubbs, P. W. R. “Microcomputer Control of an Automotive Perbury Transmission,” C200/81 Proc. of 3rd International Conference on Automotive Electronics Mechanical Engineering Publication 1981
- Stubbs, P. W. R. “The Development of a Perbury Traction Transmission for Motor Car Applications,” ASME Paper No. 80-C2/DET-59 August 1980
- Hanachi, S. “A Study of the Dynamics of a Split-Torque, Geared-Neutral Transmission Mechanism,” Journal of Mechanical Design Transactions of ASME 112 261 September 1990
- Wilson, W. E. “Positive Displacement Pumps and Fluid Motors,” Pitman & Sons 1950