This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Adaptive nth Order Lookup Table used in Transmission Double Swap Shift Control
Technical Paper
2008-01-0538
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The new Chrysler six-speed transaxle makes use of an underdrive assembly to extend a four-speed automatic transmission to six-speed. It is achieved by introducing double-swap shifts. During double-swap shift, learning the initial clutch torque capacity of the underdrive assembly's subsystem has a direct impact on the shift quality. A new method is proposed to compute and learn the initial clutch torque capacity of the releasing element. In this paper, we will outline a new mathematical method to compute and learn the accurate starting point of the clutch torque capacity for double swap shift control. The performance of the shift is demonstrated and the importance of the adaptation to shift quality is highlighted. An nth order lookup table is presented; this table contains n rows and m columns. Every row defines a relationship between the dependent variable such as actuator duty cycle and one independent variable such as transmission oil temperature, input torque or battery voltage. For given values of the independent variables, one dependent variable is computed as a function of weighted linear combination of n different interpolations. An example is given to calculate the initial duty cycle based on two independent variables (transmission oil temperature and the input torque). Based on shift results, this method is demonstrated to be effective, and accurate.
Recommended Content
Ground Vehicle Standard | Automatic Transmission Functions—Terminology |
Ground Vehicle Standard | Park Standard for Automatic Transmissions |
Technical Paper | Modeling, Control, and Adaptation for Shift Quality Control of Automatic Transmissions |
Authors
Topic
Citation
Dourra, H. and Mourtada, A., "Adaptive nth Order Lookup Table used in Transmission Double Swap Shift Control," SAE Technical Paper 2008-01-0538, 2008, https://doi.org/10.4271/2008-01-0538.Also In
References
- Winchell F.J. Route W.D. “Ratio Changing the Passenger Car Automatic Transmission” SAE paper number 311A
- Benford H.L. Leising M.B. “The Lever Analogy: A New Tool in Transmission Analysis” SAE paper number 810102
- Dourra H.A. Kwapis D. “Development of Output Torque Equation for Double Swap Shift Control” SAE paper
- Martin Dourra H. Redinger C. Champine M. Goedtel F. Lowe G. Barrer S. “62TE 6-Speed Transaxle for Chrysler Group” SAE paper number 07PFL-868
- Dourra Hussein Mourtada Ali “Double Swap Shift with Accuracy” CTI Symposium June 12-14 2007