The project aims to develop a prototype range extender in the laboratory to test the feasibility and viability of such a system for an industrial electric vehicle. In particular, the aim is to develop the control logic required to link the different elements of the system, i.e.: management of the different recharging modes, management of the starting of the combustion engine in different climatic conditions, management of the control of the speed of the combustion engine, management of the different operating modes, management of the state of charge of the battery and of the level of recharging required according to the type of accumulator installed (lead-acid or lithium-ion battery), and management of the communication and scheduling between the different components. The design will be based on a 1D model made with AMESim software and will then be validated in the laboratory. The development of the autonomy extender is a partnership project between Motrec International and Hydraulique EP, in collaboration with the INNO-VÉ consortium and ITAQ (IVI), and with the financial participation of NSERC. Hydraulique EP wishes to become involved in the control of hybrid off-road vehicles, while Motrec wishes to develop a range extender and offer it as an option on its electric vehicles to replace its thermal vehicles and thus simplify this assembly line. Hybrid off-road vehicles are an increasingly interesting market segment for Hydraulique EP, which specialises in hydraulics but is increasingly diversifying its activities, notably by developing a programming and integration department. Hybridization of vehicles makes it possible to considerably reduce consumption and polluting emissions without reducing autonomy. On the other hand, the architecture of this type of vehicle is much more complicated than that of a conventional vehicle and deserves to be studied in detail before being put on the market.