Automotive wiring harness modelling for sub-transient vehicular power system simulations up to 150 kHz

Modelling the electric parameters of vehicles is one of the primary aspects of modern automobile development, and even more so as electrification plays an ever-increasing role today and in the near future, with current political debate in the EU focusing on the phase-out of internal combustion engine vehicles in favour of ones equipped with electric motors. Current issues in this field deal with the reliable energy supply of safety-relevant components for automated driving functions. To provide this feature, it is necessary to fully understand the phenomena that take place in the electric and electronic components of the vehicle, both in steady state conditions as well as during transients and, therefore, create simulable models of the vehicular power system. The aim of this work in the BMW Research & Development Division is to derive the simplified mathematical representation of the wiring harness of the vehicle low voltage power system by implementing FEM calculations of the wiring harness itself. As a further step, automatable modellingmethods of the on-board power system of vehicles are designed, with the aim of extracting necessary simulation parameters directly from the wiring harness description list (KBL) and 3D model of the car body. These are utilized to achieve a more detailed model of the system in sub-transient scenarios, specifically taking into account the 3D geometry of the wiring harness, therefore considering both self- and mutual inductances of conductors. The findings of this work will be useful for the better understanding of how vehicle energy systems work, and how they may be improved.