METHOD FOR PREVENTING OVERVOLTAGES IN AN ELECTRICAL SYSTEM OF A MOTOR VEHICLE

A method for preventing overvoltages in an electrical system of a motor vehicle is provided. The electrical system has as voltages sources an electric machine coupled to an internal combustion engine and a motor vehicle battery. The electric machine has a stator winding, a rotor winding and a field...

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Bibliographische Detailangaben
Hauptverfasser:	HERBIG RALF, LABITZKE HERBERT
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION PERFORMING OPERATIONS TRANSPORTING VEHICLES IN GENERAL VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR
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Beschreibung
Zusammenfassung:	A method for preventing overvoltages in an electrical system of a motor vehicle is provided. The electrical system has as voltages sources an electric machine coupled to an internal combustion engine and a motor vehicle battery. The electric machine has a stator winding, a rotor winding and a field regulator assigned to the rotor winding for controlling a field current flowing through the rotor winding. The voltage generated by the electric machine is limited to an upper voltage threshold value if (i) a rotational speed corresponding to the rotational speed of the electric machine is below a rotational speed threshold value, and (ii) a temperature corresponding to the temperature of the motor vehicle battery is below a temperature threshold value.