Thesis /

ROMDOC-THESIS-2017-929

Modeling and numerical simulation of the automotive fluid control systems

Dragne, Florin Daniel
2011-04-29

Abstract: In the context of unprecedented automotive automted systems developpment, the author approached, using systems theory modern tools, a mathematical modeling and simulation of the automotive fluid control systems. This paper is an attempt to formulate a method of modeling, analysis and simplification of physical systems with application in construction and validation of an ABS / ESP braking system and the posibility to integrate this model into a real time simulation environment ( Hardware in the Loop - HIL). To fulfill this purpose the author had all the time in mind the basic principles used in modeling, simplification and simulation of tehnical systems - for a model to be representative in terms of results it must meet the following criteria: to have physically meaningful parameters, to have physically meaningful state variables and to have the minimum complexity required to address the modeling objective. These principles were applied by dividing the research and development activities in three categories: physical modeling, numerical methods and computer science and programming. The research and development stages were based and structured on these activities but also on the AMESim (simulation program) facilities for modeling and simulation. These facilities can bring out certain aspects of big importance for system simplification. You can find out the number of iterations for each system state variable (State Count) or the amount of energy exchanged by sistem components (Activity Index). Based on these considerations this paper proposes a methodology that can develop and then simplifies the mathematical models in order to reach a level of simplicity that allows real-time simulation but remain sufficiently representative to make decisions based on the simulation results analysis. In the first phase an complex system was developed and modeled. All this system elements were modeled and solution were found to simplify the elements through static and dynamic behavior analysis. Then the whole system was ansambled, tested and validated. The results were analyzed and new decissions were made on the necesity to do other simplifications. After a series of iterations, tests and after a detailed analisys, the conclusion is that the final goal was reached and we can say that the methodology is validated. Keywords: ABS / ESP system, modeling, simulation, simplification, system reduction, valve, state variables, energy exchange.

Keyword(s): Autovehicule rutiere -- Transmisii hidraulice -- Teză de doctorat ; Simulare pe calculator -- Sisteme hidraulice -- Teză de doctorat
OPAC: See record in BC-UPB Web OPAC
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