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Integrating Functional Mock-up Units for HIL Simulation

Hilding Elmqvist (Dassault Systèmes ), Dr. A. Uhlig (ITI), Andreas Pillekeit (dSPACE), Dan Henriksson (Dassault Systèmes), Torsten Blochwitz (ITI) (from left to right) present the integration of FMUs from different vendors into one real-time simulation model.

dSPACE at Modelica Conference 2014
At the Modelica Conference 2014 in Lund, Sweden, dSPACE joined ITI and Dassault Systèmes to demonstrate how FMUs (functional mock-up units) from different vendors can be integrated to make one real-time capable application for hardware-in-the-loop (HIL) simulation.
 
The objective was to replace some parts of the virtual vehicle simulation model in an existing HIL testing system for an electronic stability program (ESP) ECU with new ones developed according to a physical modeling (acausal) approach. The virtual vehicle simulation model was developed in Simulink® by dSPACE using the Automotive Simulation Model (ASM) library and interface descriptions. ITI and Dassault Systèmes provided the new model parts in the form of real-time-capable C code functional mock-up units (FMUs). The FMUs are based on Functional Mock-up Interface (FMI) for Co-Simulation 2.0, Release Candidate 1. dSPACE supports this standard with Release 2014-A of the VEOS and SCALEXIO platforms.
 
All the simulation model parts – the engine (Dymola® from Dassault Systèmes), drivetrain (SimulationX® from ITI), and vehicle dynamics including driver and maneuver control (Simulink-based Automotive Simulation Model from dSPACE) – were imported into dSPACE ConfigurationDesk and integrated to make one application. The existing project data for the I/O and the real load, i.e., the real ESP ECU, was easy to reuse in ConfigurationDesk® and did not need adapting. In the next step, the integrated overall simulation application was downloaded onto a dSPACE SCALEXIO HIL system and executed. The simulation run was controlled and visualized with ControlDesk® and MotionDesk®, using the same layouts and project data as with the former model version.
 
The demonstration showed clearly that by using FMUs with dSPACE hardware and software, new functionality can be integrated into existing simulation models without comprehensive adaptations to the system.
 
The presentation can be downloaded at the official FMI web site. www.fmi-standard.org/

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