Motor vehicle electrical system having subsystems and a generator system, generator system and method for operating a vehicle electrical system

A generator system for a motor vehicle electrical system having at least one first subsystem and one second subsystem having different voltage levels, wherein the first subsystem includes a generator system configured to supply the first subsystem with a first subsystem voltage, the generator system having an electrically excited generator including an exciter winding and a generator governor for controlling the exciter winding, and wherein the exciter winding is connected to the second subsystem and supplied with a second subsystem voltage from the second subsystem, the generator system comprising:

• a generator;
• and
• a generator governor configured to detect the first subsystem voltage of the first subsystem of the motor vehicle electrical system and to supply an exciter winding of the generator with the second subsystem voltage of the second subsystem.

A method for operating a motor vehicle electrical system having a generator system and at least one first subsystem and one second subsystem having different voltage levels, wherein the first subsystem includes a generator system configured to supply the first subsystem with a first subsystem voltage, the generator system having an electrically excited generator including an exciter winding and a generator governor for controlling the exciter winding, and wherein the exciter winding is connected to the second subsystem and supplied with a second subsystem voltage from the second subsystem, the generator system having a generator and a generator governor configured to detect the first subsystem voltage of the first subsystem of the motor vehicle electrical system and to supply an exciter winding of the generator with the second subsystem voltage of the second subsystem, the method comprising:

• supplying, with the aid of the generator governor, the exciter winding of the generator system with the second subsystem voltage of the second subsystem;
• and
• outputting an output voltage of the generator system to the first subsystem.