Fuel consumption and driveline efficiency are important issues in the automotive industry. Continuously Variable Transmission s(CVT) can cover a wide range of ratios which makes it possible to operate a combustion engine in more efficient working points than stepped transmissions. The main reason for the low efficiency of modern production CVT are the high clamping forces in the variator necessary to prevent belt slip. In this paper, a method is presented to measure and control slip in a modern production CVT. The Jatco CK2 is used for testing, which is based on the metal push belt from Van Doorne's Transmissie (VDT). An increase in torque in the variator will lead to more slip. When the slip level remains in the microslip region, an increase in slip will also lead to an increasing traction coefficient, thus allowing the higher torque to be transmitted. In the macroslip region however, slip will increase drastically if no action is taken when the torque increases. Using slip control, the clamping forces are actively controlled to maximize the efficiency of the CVT. This is achieved by maintaining an amount of slip, where the traction coefficient is near its maximum. This means that the slip is controlled in the transition area of the micro- and macroslip regions. An increase in the torque level will lead to an increase in beltslip, but by adjusting the clamping force fast enough the slip will not reach destructive levels and therefore damage can be avoided. The most important requirement of the slip controller is the ability to attenuate the load disturbances caused by torque peaks in the driveline. To meet all requirements, a synthesis model for robust PI(D)-controllers with optimal load disturbance response is used. The slip controller is simulated and tested on a test rig that is equipped with a 2.0-l internal combustion engine, a flywheel, and eddy-current brake and a disc brake to simulate realistic road loads.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    LPV control of slip in a pushbelt-type variator. Slip control implemented in an Audi A3


    Contributors:


    Publication date :

    2005


    Size :

    13 Seiten, 11 Bilder, 1 Tabelle, 7 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    LPV control of slip in a pushbelt type variator : Slip control implemented in an Audi A3

    Bonsen,B. / Steinbuch,M. / Veenhuizen,P.A. et al. | Automotive engineering | 2005



    Gross slip-based control of a variator assembly

    ZHANG ZHEN J / BRADLEY JESSE B / ZHOU JING et al. | European Patent Office | 2015

    Free access

    Performance optimisation of the push-belt CVT by variator slip control

    Bonsen,B. / Klaassen,T.W. / Pulles,R.J. et al. | Automotive engineering | 2005


    Performance optimisation of the push-belt CVT by variator slip control

    Bonsen, B. / Klaassen, T.W.G.L. / Pulles, R.J. et al. | Tema Archive | 2005