Realtime Co-Simulation

  Realtime Network Copyright: RWTH Aachen | VKA

Virtual system development (“frontloading”) is getting more and more important in a plenitude of industrial domains to reduce development time, costs and time-to-market. Co-simulation is a particularly promising approach for interoperable modular development. However, coupling and integration of real-time systems into simulation environments (especially for networks of distributed HiL systems and simulations) still requires enormous effort. The coupling of different testbeches at CMP to detailed environment simulations shows realistic interactions with the traffic scenario. Through this, the implementation of complex test scenarios allows to draw conclusions about the performance of the powertrain system in a connected environment at an early development stage.

Furthermore, the fundemental work is base for the application of the ACOSAR Project. The aim is to develop both a non-proprietary “Advanced Co-simulation Interface” (ACI) for RT-System integration and an according integration methodology, which shall be a substantial contribution to international standardization (FMI). The results of ACOSAR will lead to a modular, considerably more flexible as well as shorter system development process for numerous industrial domains and will enable the establishment of new business models.


Systemic investigations on the drivetrain

New technical developments in mobile propulsion, especially hybrid and battery technology, and widen the evelopment of propulsion systems to an integrated research field of numerous different disciplines. Tasks concerning the research of new powertrains hence become constantly more complex and therefore require interdisciplinary cooperation.

The interdisciplinary approach chosen for the establishment of the Center for Mobile Propulsion is also reflected in the experimental instrumentation of the research center: Within the CMP, component test benches for batteries, electric motors, transmissions, combustion engines and powertrains are installed.

  Realtime Network Copyright: RWTH Aachen | VKA

Realtime Network

By focusing all these test benches at one facility, real-time communication between the different component test benches is enabled (via network). The integration of a simulator facilitates to simulate a systematic behavior of early stage components. Thereby, virtual powertrains can be outlined independently from individual setups. By this, researchers can examine interactions of single components in dynamic use, consider the effects of different topologies and explore necessary control strategies of the overall system in an early project phase. Moreover, the test laboratory has an integrated workshop to conduct setups and alterations on-site. The test benches are designed highly flexible for time saving and an effective use. Simulated virtual components of the drive train will be integrated into the test bed infrastructure. The exchange of information between different test rigs in real time allows the test in the system network in the combination of real and virtual components.




Co-Simulation is a key factor for early predictions and corresponding early design decision in a modern development process. In the “ACOSAR” project, an new standard interface for extension of this approach to the realtime domain is developed.


Connected vehicle and intelligent infrastructure offer a high potential for improvement of the powertrain efficiency. In the joint research project “Hy-Nets” a novel approach for realtime coupling of hybrid propulsions on a test bench to an environmental simulation of the vehicles incl. car2car communication is developed.


Fuel economy is a key aspect to reduce operating costs and improve efficiency of freight traffic, thus increasing truck competitiveness. Under the coordination of AVL, the main objective of the IMPERIUM project is to achieve fuel consumption reduction up to 20% (diesel and urea) whilst keeping the vehicle within the legal limits for pollutant emissions.



Timm Fahrbach

Research Associate


+49 241 80 24221




Electric-Motor-in-the-Loop: Efficient Testing and Calibration of Hybrid Power Trains

The Distributed Co-Simulation Protocol for the Integration of Real-Time Systems and Simulation Environments

Road-to-Rig-to-Desktop – Virtual Development Using Real-Time Engine Modeling and Powertrain Co-Simulation

Virtual Transmission Evaluation using an Engine-in-the-Loop Test Facility

Virtual 48V Mild Hybridization: Efficient Validation by Engine-in-the-Loop

Crank-Angle Resolved Real-Time Engine Modelling A Seamless Toolchain from Concept Design to HiL Testing

Crank Angle Resolved Real-Time Engine Modeling for HiL Based Component Testing

Road-to-Rig-to-Desktop – Virtual Development Using Real-Time Engine Modeling and Powertrain-Co-Simulation

Engine in the Loop: Closed Loop Test Bench Control with Real-Time Simulation

Virtual shaft: Synchronized motion control for real time testing of automotive powertrains