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, wherein the transmission is connected to the internal combustion engine via an input shaft, the hybrid vehicle having a first A power grid, a second power grid, the second power grid operates at a lower voltage level than the first power grid as an on-board power grid, and the first power grid operates at a higher voltage level than the second power grid, wherein, compared with the second power grid In the case of a grid connection: the electrical machine is operated, the electrical energy storage device is operated, the energy converter is operated, the energy converter transmits electrical power at least from the first grid to the second grid, wherein the generator is omitted in the second grid. The invention is characterized in that the first grid is designed as part of the transmission system, which together with the components coupled thereto is driven via the transmission controller, wherein power is generated by the electric machines, and wherein when the power is distributed , the energy supply to the second grid has a higher priority than the motor support of the drive of the input shaft by the electric machine.

Description

technical field [0001] The invention relates to a method for operating a hybrid vehicle. 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 electrical network of the hybrid drive to the voltage level of the el...

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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