For years, the interest of the UDR1 research group has focused on the\r\ndevelopment of a Hybrid Series (HS) vehicle, different from the standard one thanks to the\r\nuse of a Gas Turbine set (GT) as a thermal engine. The reason for this choice resides in the\r\nopportunity to reduce weight and dimensions, in comparison to a traditional Internal\r\nCombustion Engine (ICE). It is not possible to use the GT engine set directly for the\r\nvehicle traction, therefore the UDR1 HS configuration shows the GT set connected with\r\nthe electric generator only. The result is that the traction is purely electric. The resulting\r\nengine configuration is a commonly defined Hybrid Series. Many efforts are spent in the\r\ndefinition of a generic scientific method to define the correct ratio (Degree of\r\nHybridization) between the installed power of the battery pack and that of the GT electric\r\ngenerator, which simultaneously guarantees the life of the battery pack and the capacity of\r\nthe vehicle to complete a common mission without lack of energy or stopping. This article\r\nreports a method to define the power ratio between battery pack and GT generator, applied\r\nto a recent commission for the development of a mini city bus.
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