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The constant growth of the automotive market demands for comfort to the user and energy efficiency have caused the intensification of the industry researches and development of the automatic transmissions (AT). However, vehicles equipped with these gearboxes entails in higher fuel consumption levels than the one required by vehicles equipped with manual transmission. In the automotive industry due to the advantages offered using computer simulations, such as fast evaluation an optimization, many researchers are using virtual models for optimization of dynamic behavior of systems and fuel consumption. Aiming to study the dynamic behavior of an AT and the influence of its components on that behavior, this paper presents an AT dynamic model developed in MATLAB® / Simulink®.

Model-based design (MBD) methodology has been intensely evolved in the last decades as a simulation-approach to enhance complex systems development and understanding. It offers great trade-offs when compared to traditional hardware-based techniques by reducing design time and costs due to the reduced risk of implementation errors. It is desired when developing a complex system model to create an accurate plant, capable of offering the designer a reliable platform for system evaluation and control design. In order to have a better understanding of MBD technique, this paper presents the development of an electromagnetic coupling system, which aims smooth engagement control. As part of the MBD implementation loop, it is also presented the electromagnetic and structural simulations performed to estimate the actuator force and return mechanism stiffness coefficient, which were post validated by bench tests.