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We highlight an automotive powertrain co-simulation solution for developing SiL (Software in loop) simulation environment. This solution provides a co-simulation interface for importing control algorithm from Simulink to Modelica environment using RTW toolbox. Detailed illustration is given on how to realize this co-simulation interface. To verify the cosimulation solution, a SiL environment is constructed for an AMT control software, and a virtual vehicle acceleration experiment is launched in a Modelica simulation environment. This experiment gives reasonable results and validates the cosimulation solution.

A transmission integrated with more than one motor is defined as Vehicular Active Transmission. It can not only transmit the mechanical power, but also convert the energy between electrical and mechanical. The transient control in gear or mode switching process is one of the key technologies of active transmission. This paper applies optimal control theory to motor speed control in the process of gear shifting. The simulation comes to good control results that the motor reach rapidly target speed and keep stable around, which validates the feasibility of this motor speed control method.