Abstract
AbstractThe focus on the expansion of the electrification of vehicles becomes stronger. Thus, the development process of powertrains of those cars needs to be more dynamic to react to the new challenges. One way to accelerate the development is to automate predevelopment and evaluation at an early stage. An automated method to synthesize transmission topologies and pre-design gears for the generated topologies for electric vehicles is presented within this paper. The method contains two internal evaluations—one after the topology synthesis and the second after the initial design of the gears. The results of the method are gear ratios and gear data for the single transmission steps of each topology. The inputs and boundary conditions can be easily changed and fitted to specific requirements for all use-cases. Here, the process is explained, and the methods' results are validated using state-of-the-art passenger vehicle transmission. As for electric trucks, no state-of-the-art electric powertrains exist; the method is subsequently applied to find topologies for a heavy-duty truck. Extracts of the results are presented. The application for trucks is carried out within the publicly funded research project “Concept ELV2”. In general, the method is capable of synthesizing transmissions for any given vehicle and motor combination.
Highlights
The United Nations agreed on reducing greenhouse emissions significantly within the Paris Agreement [27]
The topology synthesis produces every transmission topology which is suited to fulfil driving requirements for the specified vehicle motor combination
The synthesis equipped with the weight factors from the survey produces six transmission topologies, which are theoretically feasible for the BMW i3
Summary
The United Nations agreed on reducing greenhouse emissions significantly within the Paris Agreement [27]. A further aspect of developing new transmissions with an electric drive is a reduction in iterations within the design process to save costs and accelerate the development process. This is important as the market is very dynamic due to fast improvements in the technology sector of electrified vehicles which is underlined by a growing number of different EVs in the market. One possibility to conquer the challenges described are automated transmission syntheses, which may integrate evaluations of their solutions based on preliminary parameters and designs This process can support engineers in a very early development stage by finding possible solutions and giving a holistic overview of the solution space. The following section gives a short overview of transmission synthesis approaches in different use-cases
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