Method for operating a hybrid vehicle

Abstract

The invention relates to a method for operating a hybrid vehicle (1), which is operated with an internal combustion engine, an electric machine (7) and a transmission, the transmission being connectedto said internal combustion engine via an input shaft, a first electrical network, a second electrical network as an on-board network, which is operated on a lower voltage level than the first electrical network, the first electrical network being operated at a higher voltage level than the second electrical network. The following elements are operated while being coupled to the first electricalnetwork: the electrical machine, an electrical energy storage device, and an energy converter which transfers electrical power at least from the first electrical network to the second electrical network, an alternator being dispensed with in the second electrical network. The invention is characterized in that the first electrical network is designed as part of a transmission system which is actuated together with the components coupled thereto by means of a transmission control device, wherein power is generated by the electrical machine, and wherein the energy supply of the second electricalnetwork has a higher priority during power distribution than a motor support of the drive of the input shaft by the electrical machine.

Description

technical field [0001] The invention relates to a method for operating a hybrid vehicle according to the type defined in detail in the preamble of claim 1 . Background technique [0002] Hybrid vehicles are already known from the general prior art in the field of passenger vehicles. Hybrid vehicles are also increasingly being used in the field of commercial vehicles, for example in small commercial vehicles or especially in commercial vehicles that are frequently started and stopped. Such a commercial vehicle can be, for example, a transport vehicle or, in particular, a bus, mainly a bus that travels within a city on a bus line service. [0003] In principle, it is known from the general prior art to dispense with a generator in hybrid vehicles. Thus, the electrical energy supply to the vehicle electrical system is carried out by the hybrid system, for example, by causing an energy converter, in particular a DC / DC converter, to convert power from the voltage level of the e...

AI Technical Summary

Problems solved by technology

In commercial vehicles, which are typically much heavier than this, this requires very large and thus expensive and heavy energy storage devices, which is disadvantageous, especially when the hybrid system of the vehicle is to be used as a so-called mild hybrid when designed as a hybrid powertrain, that is, as a hybrid system suitable only for supporting driving and not exclusively for electric driving of the vehicle, since such hybrid systems are typically used for energy storage devices that are not too large

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