This thesis is based on a retrofit kit project aimed at converting vintage vehicles into electric ones. Specifically, it focuses on the model-based software development of the Vehicle Control Unit (VCU), the kit component responsible for regulating and supervising vehicle operations. In preparation for the work, a comprehensive study of electric vehicles was conducted, covering history, the state of the art, topologies, and key components. Subsequently, the existing VCU algorithm, implemented in LabVIEW®, was thoroughly analyzed to gather requirements and understand specifications. Documentation and schematic representations were produced to map the control logic, by tracking the variables flow and structuring a data dictionary.