Patent ID: 11884221
Assignee: FORD GLOBAL TECHNOLOGIES, LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  H  Y | IPC B  H

Claim 8:
9. A method of operating an on-board electrical network of a motor vehicle, wherein the network has a first voltage circuit, a second voltage circuit, and DC-to-DC converter coupled between the first voltage circuit and the second voltage circuit, wherein the first voltage circuit has a first operating voltage which is higher than a second operating voltage in the second voltage circuit, wherein the first voltage circuit comprises a first battery at the first operating voltage, wherein the second voltage circuit comprises a main battery and an auxiliary voltage source at the second operating voltage, and wherein the second voltage circuit further comprises at least one of a transmission control unit and an integrated hybrid controller, the method comprising the steps of:
closing a first switching element in the second voltage circuit between the main battery and the at least one of a transmission control unit and an integrated hybrid controller while simultaneously closing a second switching element in the second voltage circuit between the auxiliary voltage source and the least one of a transmission control unit and an integrated hybrid controller to redundantly supply electrical energy to the at least one of a transmission control unit and an integrated hybrid controller;
switching the first switching element to an open state in response to detection of a fault associated with the main battery; and
switching the second switching element to an open state in response to detection of a fault associated with the auxiliary voltage source.