Patent ID: 7276880

Claim:
A device for determining the availability of electrical energy in an on-board electrical system having energy-storing circuits that form at least two subsystems, in the form of battery circuits, which communicate with one another via a voltage converter, and having a control unit, which influences the voltage converter and includes computation means, which evaluate charge-specific algorithms, wherein the charge-specific algorithms include at least one threshold value statement (SOCS) for the availability of electrical energy in at least one subsystem, threshold value statements (SOHS) for malfunctions in at least one subsystem, and both at least one threshold value statement (SOCS) for availability of electrical energy in at least one subsystem and threshold value statements (SOHS) for malfunctions in at least one subsystem, further comprising means for displaying the availability of the electrical energy, a malfunction, or displaying both the availability of electrical energy and a malfunction.