A control-oriented model of a Dual Clutch Transmission (DCT) was developed for real-time Hardware In the Loop (HIL) applications, to support model-based development of the DCT controller and to systematically test its performance. The model is an innovative attempt to reproduce the fast dynamics of the actuation system while maintaining a simulation step size large enough for real-time applications. The model comprehends a detailed physical description of hydraulic circuit, clutches, synchronizers and gears, and simplified vehicle and internal combustion engine sub-models. As the oil circulating in the system has a large bulk modulus, the pressure dynamics are very fast, possibly causing instability in a real-time simulation; the same challenge involves the servo valves dynamics, due to the very small masses of the moving elements. Therefore, the hydraulic circuit model has been modified and simplified without losing physical validity, in order to adapt it to the real-time simulation requirements. The results of offline simulations have been compared to on-board measurements to verify the validity of the developed model, which was then implemented in a HIL system and connected to the Transmission Control Unit (TCU). Several tests have been performed on the HIL simulator, to verify the TCU performance: electrical failure tests on sensors and actuators, hydraulic and mechanical failure tests on hydraulic valves, clutches and synchronizers, and application tests comprehending all the main features of the control actions performed by the TCU. Being based on physical laws, in every condition the model simulates a plausible reaction of the system. A test automation procedure has finally been developed to permit the execution of a pattern of tests without the interaction of the user; perfectly repeatable tests can be performed for non-regression verification, allowing the testing of new software releases in fully automatic mode.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Control-Oriented Models for Real-Time Simulation of Automotive Transmission Systems


    Contributors:
    Cavina, N. (author) / Corti, E. (author) / Marcigliano, F. (author) / Olivi, D. (author) / Poggio, L. (author)


    Publication date :

    2015


    Size :

    24 Seiten, Bilder, Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Real-time Simulation of Detailed Automotive Models

    Elmqvist, H. / Mattsson, S.E. / Olsson, H. et al. | German Aerospace Center (DLR) | 2003

    Free access

    Real time simulation of complex automatic transmission models

    Bataus,M. / Maciac,A. / Oprean,M. et al. | Automotive engineering | 2010


    Automotive Vapor Compression Cycles: Validation of Control- Oriented Models

    Alleyne, Andrew / Eldredge, Brian / Rasmussen, Bryan | SAE Technical Papers | 2006


    Automotive vapor compression cycles: validation of control-oriented models

    Eldredge,B. / Rasmussen,B. / Alleyne,A. et al. | Automotive engineering | 2006


    Automotive real-time control systems engine control using a MC 68332

    Lobaza,A.G. / General Motors,US | Automotive engineering | 1989