Next Level of Testing - Extended Frontloading through Latency-optimized EiL Test Benches
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Next Level of Testing – Extended Frontloading through Latency-optimized EiL Test Benches Optimized EiL test benches for the precise simulation and differentiated reproduction of real drives make it possible to counteract the significantly increased test effort caused by RDE test drives on the road. In particular, process times and latencies in the exchange of information have a negative influence on the quality and significance of the measurement results. The focus of current work is therefore on minimizing precisely those influencing parameters in order to be able to map real drives as accurately as possible, as shown in this article by RWTH Aachen and dSpace.
AUTHORS
Daniel Guse, M. Sc. is Research Assistant at the Insti tute for Combustion Engines (vka) at RWTH Aachen University in Aachen (Germany).
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Prof. Dr.-Ing. Jakob Andert is Junior Professor for the Field of Mechatronic Systems for Com bustion Engine at RWTH Aachen University in Aachen (Germany).
Stefan Walter, M. Sc. is Strategic Product Manager at dSpace GmbH in Paderborn (Germany).
Norbert Meyer, M. Sc. is Group Leader for Modeling Powertrain Components at dSpace GmbH in Paderborn (Germany).
© dSpace
THE RDE CHALLENGE
The introduction of both the Real Driving Emissions (RDE) test procedure and the Euro 6d emissions standard places more focus on optimizing and validating Electronic Control Unit (ECU) and powertrain functionalities that influence emissions. The effort required to perform validations is continuously increasing due to ever-more complex powertrains and a rising number of vehicle variants in combination with a nonreproducible RDE test procedure. To deal with this effort effectively, it is essential to frontload the scope of development and testing [1-5]. Early feedback on the impact of component development on the overall vehicle level thus leads to a sustainable reduction in costs [3-5]. Hardware-in-the-Loop (HiL) systems are more frequently used for the realistic and reproducible validation of the in creasingly interlinked and partially interMTZ worldwide 10|2020
disciplinary functional structures of modern powertrain control units. Consecutively replacing individual ECUs with comprehensive mechatronic component test benches, for example, in the Enginein-the-Loop (EiL) application scenario, allows for making statements about pollutant generation and conversion taking place in combustion engines in dynamic and realistic operating scenarios. Test scopes on EiL test benches can be executed automatically and they are highly reproducible. This makes it possible to separately evaluate and optimize the effects of individual hardware and/or software modifications on individual operating states and emission events of the combustion engine in interaction with the virtual vehicle concept and operating scenario. To implement an EiL test scenario, an internal combustion engine with the appropriate engine ECU and the complete exhaust aftertreatment system that is comparable to the one of the real vehicle is installed on a highly dy
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