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Within the motorcycle- and powersport sector the hybridization and electrification of the powertrain is increasingly becoming an important topic. In the automotive sector the hybridization of the powertrain is already well established and shows improvements regarding fuel consumption and emission behavior. Also in the motorcycle sector the emission legislation limits are getting stricter and the requirement for a significant reduction of fuel consumption, especially under real drive condition, is being focused. Furthermore, the increasing environmental awareness of the customer requires measures regarding fuel consumption- and emission minimization. Due to the high system complexity and degrees of freedom of hybrid powertrains, the simulation of the complete vehicle is essential for the component dimensioning, concept selection and the development of operation strategies.

This publication covers the development process of a thermal model within a complete longitudinal vehicle simulation. Therefore a dynamic/forward simulation within MATLAB Simulink is used. The modeling of the heat transport in the cooling circuit and the lubrication system as well as the heat input by the internal combustion engine is the focus of research. In the first part various possible numerical solution methods for the heat transport model are analyzed and evaluated with regard to the accuracy of the system description and real time capability. The latter is important as functionalities should be able to be subsequently implemented in an engine control unit. In addition, a method for the modeling of the heat input of the internal combustion engine is evaluated. Finally, a validation of the heat transport and heat input model is performed, using a two-cylinder motorcycle.

Within the automotive sector, the hybridization of the powertrain is well investigated and first announcements about mass production start dates have been made. Studies have shown that improvements regarding fuel economy and emission are possible. This potential and additional positive effects regarding driving performance should also be gained for the power-sport sector, even though very few investigations have been performed for this vehicle class. Though the requirements for a power-sport drivetrain differ from that of the automobile sector due to the high demand on the transient behavior, intense investigations have been started. The use of a complete vehicle simulation during the development of a hybrid vehicle is advantageous in the early phase and in the pre series calibration phase. The foreground topic for the simulation of a conventional powertrain is the power and torque distribution.