Investigation of different temperature-optimized control strategies for electrical machines in a virtual complete vehicle network
In light of climate changes, especially the transport sector offers an enormous potential for the reduction of greenhouse gases. Electrification of the powertrain combined with a fuel cell or battery is a key component in this context. In this regard, efficiency is of central importance, since on the one hand the dimensioning of the battery or fuel cell and the tank system depends on it, and on the other hand a reduced energy demand of the drive can be achieved.
In the context of increasing energy efficiency, thermal investigations and the exploitation of these effects in favor of efficiency are crucial. For this purpose, simulative investigations have already been carried out, showing the potential for reducing energy demand. In order to be able to validate these results, an existing test bench will be equipped to determine the efficiency of two test objects in thermal comparative tests. Not only the electric machine and the inverter will be considered, but also the entire vehicle and its operating strategy are taken into account using the HiL (hardware-in-the-loop) approach. For this purpose, an RCP system will be acquired that offers a high degree of freedom with regard to the control algorithms (six-phase simultaneous operation) and can cover the simulative mapping of the entire vehicle and its operating strategy. Since simultaneous operation of two test objects using different cooling strategies is advantageous due to direct comparability with identical boundary conditions, a three-phase test bench converter will be extended to six phases in order to enable this mode of operation.
The aim of the investigations is to develop a universal, methodical approach that can be used to optimize electrified powertrains in terms of thermal aspects (operating strategy and component design) and to validate it by means of test bench trials.