Robert Boschgmbh

Manuel Mueller

Miriam Riederer

Sebastian Paulus

Zoltan Ersek

Paul Mehringer

Michael Wohlfarth

Udo Schulz

Wolfgang Fischer

Kurt Reutlinger

Fabio Magini

Hermann Mehling

Klaus Habr

Method for detecting a state of an electric system () in a motor vehicle, said electric system () comprising a generator unit that includes an electric machine () with a rotor winding () and a stator winding () as well as a rectifier () which is connected to the electric machine () and via which the electric system () is connected to the electric machine (); in said method, a decision about the current state of the electric system (), especially about the availability of a battery () of the electric system, is made in accordance with an excitation current (I) flowing through the rotor winding () of the electric machine ().

Method for detecting a state of a vehicle electric system

The invention relates to a method for detecting an error in a generator unit which has an electric machine () with a rotor winding (), a stator winding (), and a rectifier () connected thereto, via which the electric machine () is connected to an onboard electrical system () of a motor vehicle, wherein a voltage of the onboard electrical system () is controlled to a target value via an excitation current (I) through the rotor winding () of the electric machine (), and a curve of a phase voltage (U) of the stator winding () is monitored, wherein an error in the generator unit is inferred when a change of the phase voltage (U) is detected and a voltage of the onboard electrical system () changing within a threshold value range (S) is detected.

Method for detecting an error in a generator unit

A method for detecting an error in a generator unit which has an electric machine () with a rotor winding () and a stator winding () and a rectifier () connected thereto, via which rectifier the electric machine () is connected to an electrical system () of a motor vehicle, the excitation current (IE) flowing through the rotor winding () of the electric machine () being plotted and it being concluded that there is an error in the generator unit depending on whether a frequency component (A) of a frequency spectrum of the plot of the excitation current (IE) in a frequency range above a lower speed limit (SW) is larger than a threshold value (S).

The invention relates to a method for detecting an error in a generator unit which has an electric machine () with a rotor winding (), a stator winding () transformer-coupled to the rotor winding (), and a rectifier () connected to said stator winding, via which the electric machine () is connected to an onboard power supply () of a motor vehicle, wherein a decision is made, depending on a magnitude of a correlation (K, K) between a curve of an excitation current (I) flowing through the rotor winding () of the electric machine () and a curve of a voltage drop (U, U) on one side of the transformer, as to whether the error is present or not.

A method for determining a speed (nG) of a generator unit which has an electric machine () with a rotor winding () and a stator winding () and a rectifier () connected thereto, via which rectifier the electric machine () is connected to an electrical system () of a motor vehicle, the speed (nG) being determined depending on the plot of an excitation current (IE) flowing through the rotor winding () of the electric machine (). In particular, the speed is determined from a known relationship between the speed, the frequency of the excitation current, the number of pole pairs and optionally the number of phases when there is an error that leads to a constant phase voltage being output.

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Kisslegg, Germany

Manuel Mueller