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.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Adaptive nth Order Lookup Table used in Transmission Double Swap Shift Control


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE World Congress & Exhibition ; 2008



    Publication date :

    2008-04-14




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Adaptive nth Order Lookup Table used in Transmission Double Swap Shift Control

    Dourra, H. / Mourtada, A. / Society of Automotive Engineers | British Library Conference Proceedings | 2008


    Development of Output Torque Equation for Double Swap Shift Control

    Dourra, H. / Kwapis, D. / Society of Automotive Engineers | British Library Conference Proceedings | 2007


    Development of Output Torque Equation for Double Swap Shift Control

    Kwapis, David / Dourra, Hussein | SAE Technical Papers | 2007


    Development of output torque equation for double swap shift control

    Dourra,H. / Kwapis,D. / DaimlerChrysler,US | Automotive engineering | 2007


    2007-01-1308 Development of Output Torque Equation for Double Swap Shift Control

    Dourra, H. / Kwapis, D. / Society of Automotive Engineers | British Library Conference Proceedings | 2007