For the development of innovative drive systems, FKFS has been operating a new type of engine test bench for hybridized drive trains since 2019. The so-called hybrid engine test bench (HMP) of FKFS extends the capabilities of an engine test bench by a facility for exhaust gas analysis in compliance with legal requirements (CVS facility) and a battery simulation with which the electrical components can be operated.
This enables the one component that is most difficult to be described in terms of its emission behavior, the combustion engine, to be operated transiently in a way as it is in a hybrid powertrain.
Extensive exhaust gas analysis systems are available to quantify the resulting pollutant emissions. This includes a complete CVS (Constant Volume Sampling) system with full-flow dilution system, as commonly used on vehicle chassis dynamometers for exhaust gas certification. This makes it possible to make statements about how pollutant emissions will perform in RDE and WLTP for compliance with EU7 at an early stage, when only individual components of the hybrid powertrain exist actually.
This is supplemented by very fast exhaust gas analyzers that make it possible to identify emission peaks occurring over a limited period of time, and to assign them to specific driving situations and driving modes. This in turn enables an optimization of the operating strategy of the hybrid system, i.e. the targeted coordination of individual subsystems from the point of view of minimizing pollutant emissions.
This is initially done simulatively (SiL - Software in the Loop) on the basis of raw emission and exhaust gas aftertreatment models, which are also created on the basis of measurement data determined on the hybrid engine test bench. In an iterative process, the operating strategies are then validated and further optimized on the hybrid engine test bench (HiL - Hardware in the Loop).
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