Conference article

Simulation models play a fundamental role in the development of transmission control software. In the ideal case; the same model can be used throughout the whole development process from concept and design over implementation to system verification. The idea is to use one uniform model along this V-scheme. This leads to the requirement that simulations have to be able to run in real-time on hardware-in-the-loop platforms. On the other hand; very detailed models of some components might be needed during the early design phase. Thus; a trade-off between modeling depth and computational performance has to be found. This may be achieved by selectively simplifying parts of the model that are prone to generating stiff sub-systems or a large number of state events. Within this framework; the present paper introduces the Modelica simulation model of TraXon; the new modular transmission for heavy commercial vehicles by ZF. The model can be adapted to various needs by replacing components according to the required modeling depth and/or dynamical behavior. After a brief overview of the ZF in-house Modelica libraries and the architecture of the TraXon model; some approaches and tools are described for evaluating and optimizing models with respect to real-time issues.

ZF Modelica libraries; model simplification; performance analysis; hardware-in-the-loop