Engines of modern cars, like direct injection engines or electrical drives, are able to generate high torques and steep gradient torque changes. Due to a simultaneous decrease of mass in powertrain elements for reduced fuel consumption, driveline oscillations occur, especially in case of load changes. Because the driveline oscillations can tremendously affect comfort and driveability, software functions in the electronic control unit of passenger cars are used to reduce oscillations as well as to combine high comfort with sportiness. To ensure this combination, time-consuming driving tests are required to adjust the controller parameters of the software functions. The increasing number of vehicle segments and variants as well as the decreasing development times detain an optimized tuning of the functional parameters through standard approaches. To overcome this problem and thus to fulfill the high customer requirements regarding driveability in the future, an alternative algorithm to reduce driveline oscillations via software function has to be developed. Therefore, this thesis presents a model-based approach, which is able to reduce time-consuming driving tests and additionally accomplishes a high standard of comfort without constricting the engine dynamics. Research is done for powertrains with manual as well as with automatic transmission, as these gearbox types today represent more than 90 % of the produced powertrain variants worlwide. The damping concept is based on physically motivated driveline models. Depending on the gearbox type, models with two or three masses are used. To address nonlinear driveline characteristics while passing from overrun to traction condition and vice versa, backlash models are added. An adaptation to different vehicles is easily possible through identifying the model parameters from measurement data. The damping concept is designed in a predictive way. Using the model, the driveline dynamics as well as the desired driveline dynamics are predicted. To calculate the desired dynamics, the damping characteristics of the driveline models are altered. This way, continuous adjustments of the driving performance are possible. During application, only the damping parameter has to be tuned experimentally. Thus, a model-based concept for damping driveline oscillations is available which ensures a high standard of driveability through only small application effort.


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    Titel :

    Modellbasierte prädiktive Dämpfung von Lastwechselreaktionen bei Fahrzeugen mit manuellen und automatisierten Getrieben


    Beteiligte:


    Erscheinungsdatum :

    2013


    Format / Umfang :

    138 Seiten, Bilder, Tabellen, Quellen



    Medientyp :

    Hochschulschrift


    Format :

    Print


    Sprache :

    Deutsch







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    Modellbasierte prädiktive Regelung eines Kraftfahrzeugs

    WEHLEN TIMO / BUSSE TIMON / ENGEL VALERIE et al. | Europäisches Patentamt | 2023

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