The need for continuous and smooth power flow during shifting of power shift and automatic transmissions has long been recognized. In addition, over the years, vehicle users have demanded continuing transmission improvement in such areas as shift quality, clutch durability, overspeed protection, and performance. The factors - clutch size, clutch coefficient variation, gear ratio step, and clutch apply pressure characteristics - which influence shift quality (or smoothness) have been identified. Compensation for the first three of these can be achieved by controlling the fourth, the clutch apply pressure characteristics, by means described as clutch capacity modulation. A fifth factor which has an influence on shift smoothness in automatic transmissions is the proper scheduling of range shifts with respect to vehicle speed, engine speed, and engine throttle position. Several methods of shift point modulation have been developed, each with its own advantages and disadvantages. (DePo)


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    Titel :

    Hydraulic shift modulation of automatic and powershift transmissions


    Weitere Titelangaben:

    Hydraulische Schaltung automatischer Getriebe und Lastschaltgetriebe


    Beteiligte:
    Schaefer, G.W. (Autor:in)


    Erscheinungsdatum :

    1977


    Format / Umfang :

    9 Seiten, 20 Bilder


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Shift Modulation of Allison Automatic and Powershift Transmissions

    Harmon, K. B. / Schaefer, R. H. | SAE Technical Papers | 1973


    Shift Modulation Electronic Controls Applied to Powershift Transmissions

    Spokas,R.B. / Sturges,F.D. / Borg Warner,Rockford Div.,US | Kraftfahrwesen | 1981


    Shift Modulation Electronic Controls Applied to Powershift Transmissions

    Sturges, Fred D. / Spokas, Romas B. | SAE Technical Papers | 1981


    Electric controls for powershift transmissions

    Black, R.L. / Schaefer, R.H. | Engineering Index Backfile | 1968


    Design considerations in powershift transmissions

    Härdtle, W. | Tema Archiv | 1990