Patent ID: 9669779
Date: 2017-06-06
CPC Classifications: B60L,B60R,F02N,H02J,Y02T

Claim:
1. A method for operating a multi-voltage electrical system of a motor vehicle, the multi-voltage electrical system including a first subsystem and a second subsystem, the first subsystem including an attenuator, a current being selectively and alternatively feedable from the first subsystem into the second subsystem and from the second subsystem into the first subsystem, and an electrical consumer being coupleable to the first subsystem and decoupleable from the first subsystem, the method comprising: responsive to a failure of the attenuator or an off state of the attenuator provided in the first subsystem, implementing in the multi-voltage electrical system a special operating mode, in which a negative sudden load variation caused by a coupling of the electrical consumer to the first subsystem is counteracted before a minimum threshold is reached by feeding current from the second subsystem into the first subsystem, and a positive sudden load variation caused by a decoupling of the electrical consumer from the first subsystem is counteracted before a maximum threshold is reached by feeding current from the first subsystem into the second subsystem, wherein a power output of a generator in the first subsystem is adjusted in collaboration with current transfer to or from the second subsystem until a negative or positive sudden load variation is counteracted completely by the generator, after which current transfer to or from the second subsystem is stopped.