Vehicle electrical system and methods for operating a vehicle electrical system

Abstract

A vehicle electrical system comprising an electrical energy storage device (ES), an inverter (I), a DC / DC converter (D), and an electric machine (EM), wherein the inverter (I) is connected to the energy storage device (ES) via the DC / DC converter (D), and the electric machine (EM) is connected to the DC / DC converter (D) via the inverter (I), wherein the vehicle electrical system includes a bypass switch (US) through which the energy storage device (ES) is directly switchably connected to the inverter (I), and wherein the vehicle electrical system further includes a controller (C) which is connected to the bypass switch (US) and is configured to control the bypass switch (US) in the closed switching state when, with the same power demand at a demand input (E) of the controller (C), a minimum of a total power loss function (Z) is determined by inverter and DC / DC converter operating state values ​​(ΔU_I1, ΔU_D1, ΔU_I2, &Dgr;U_D2) depends on, is greater than the power loss of the inverter (I).;

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