# US 2021/0276698 A1 · Distributed landing gear system architecture for electromechanical actuation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0276698 A1 - Document ID: US20210276698A1 - Status: Published application - Kind: A1 - Application number: 17/128,143 - Filed: 2020-12-20 - Published: 2021-09-09 - Earliest claimed: 2020-03-05 - Assignees: Goodrich Corporation - Applicants: Goodrich Corporation - Inventors: Ashish Vijay; Adnan Cepic; Anil Prasad Josyula; Harish Gondihalli Venkatesha - Web page: https://patentgrep.com/patent/US20210276698A1 ## CPC - B64C 25/24: electric - B64C 25/26: Control or locking systems therefor - B64C 25/44: Actuating mechanisms - B64C 25/50: Steerable undercarriages; Shimmy-damping - B64C: AEROPLANES; HELICOPTERS ## Abstract A system for controlling landing gear subsystems may comprise a controller and a first motor drive unit in operable communication with the controller. A first electric motor and a second electric motor may be in operable communication with the first motor drive unit. A second motor drive unit may be in operable communication with the controller. A third electric motor and a fourth electric motor may be in operable communication with the second motor drive unit. An AC/DC converter may be electrically coupled to the first drive unit and the second motor drive unit. ## Claims ### Claim 1 A system for controlling landing gear subsystems, comprising: a controller; a nose gear motor drive unit in operable communication with the controller; a first electric motor in operable communication with the nose gear motor drive unit; a second electric motor in operable communication with the nose gear motor drive unit, wherein the nose gear motor drive unit is configured to drive one of the first electric motor or the second electric motor at a time; a main gear motor drive unit in operable communication with the controller; a third electric motor in operable communication with the main gear motor drive unit; and a fourth electric motor in operable communication with the main gear motor drive unit, wherein the main gear motor drive unit is configured to drive one of the third electric motor or the fourth electric motor at a time. ### Claim 2 (depends on 1) The system of claim 1, further comprising an alternating current direct current converter electrically coupled to the nose gear motor drive unit and the main gear motor drive unit. ### Claim 3 (depends on 2) The system of claim 2, further comprising a braking resistor electrically coupled to the nose gear motor drive unit and the main gear motor drive unit. ### Claim 4 (depends on 3) The system of claim 3, further comprising: a steering motor drive unit in operable communication with the controller; and a fifth motor in operable communication with the steering motor drive unit. ### Claim 5 (depends on 4) The system of claim 4, wherein the first electric motor is configured to actuate a nose landing gear bay door, and wherein the second electric motor is configured to actuate a nose landing gear between a landing gear up position and a landing gear down position. ### Claim 6 (depends on 5) The system of claim 5, wherein the third electric motor is configured to actuate a main landing gear bay door, and wherein the fourth electric motor is configured to actuate a main landing gear brake assembly. ### Claim 7 (depends on 6) The system of claim 6, further comprising: a first sensor operably coupled to at least one of the first electric motor or the second electric motor and in operable communication with the controller; and a second sensor operably coupled to at least one of the third electric motor or the fourth electric motor and in operable communication with the controller. ### Claim 8 (depends on 7) The system of claim 7, wherein the controller is configured to output commands to the nose gear motor drive unit in response to signals output from the first sensor, and wherein the controller is configured to output a second set of commands to the main gear motor drive unit in response to signals output from the second sensor. ### Claim 9 A landing gear system, comprising: a nose gear door motor; a nose gear motor drive unit in operable communication with the nose gear door motor; a nose gear retraction-extension motor in operable communication with the nose gear motor drive unit; an alternating current direct current converter electrically coupled to the nose gear motor drive unit; a controller in operable communication with the nose gear motor drive unit; and a tangible, non-transitory memory configured to communicate with the controller, the tangible, non-transitory memory having instructions stored thereon that, in response to execution by the controller, cause the controller to perform operations comprising: receiving, by the controller, a pilot command; determining, by the controller, a nose landing gear power sequence for providing power to the nose gear door motor and the nose gear retraction-extension motor in response to receiving the pilot command; and outputting, by the controller, a first command to the nose gear motor drive unit, wherein the nose gear motor drive unit is configured to power either the nose gear door motor or the nose gear retraction-extension motor based on the first command from the controller. ### Claim 10 (depends on 9) The landing gear system of claim 9, wherein the nose gear motor drive unit includes a programmable logic device configured to receive commands, including the first command, from the controller, and wherein the programmable logic device generates pulse width modulation signals configured to control at least one of the nose gear door motor or the nose gear retraction-extension motor based on the commands received from the controller. ### Claim 11 (depends on 10) The landing gear system of claim 10, further comprising: a first sensor operably coupled to the nose gear door motor and in communication with the controller; and a second sensor operably coupled to the nose gear retraction-extension motor and in communication with the controller. ### Claim 12 (depends on 11) The landing gear system of claim 11, wherein the operations further comprise: receiving, by the controller, a first signal from the sensor; and determining, by the controller, whether to power the nose gear door motor or the nose gear retraction-extension motor based on the first signal. ### Claim 13 (depends on 12) The landing gear system of claim 12, further comprising: a main gear motor drive unit electrically coupled to the alternating current direct current converter and in operable communication with the controller; a main gear door motor in operable communication with the main gear motor drive unit; and a brake control motor in operable communication with the main gear motor drive unit. ### Claim 14 (depends on 13) The landing gear system of claim 13, wherein the operations further comprise: determining, by the controller, a main landing gear power sequence for powering the main gear door motor and the brake control motor in response to receiving the pilot command; and outputting, by the controller, a second command to the main gear motor drive unit, wherein the main gear motor drive unit is configured to power either the main gear door motor or the brake control motor based on the second command from the controller. ### Claim 15 A system for controlling landing gear subsystems, comprising: a controller; a first motor drive unit in operable communication with the controller; a first electric motor in operable communication with the first motor drive unit; a second electric motor in operable communication with the first motor drive unit; a second motor drive unit in operable communication with the controller; a third electric motor in operable communication with the second motor drive unit; a fourth electric motor in operable communication with the second motor drive unit; and an alternating current direct current converter electrically coupled to the first motor drive unit and the second motor drive unit. ### Claim 16 (depends on 15) The system of claim 15, further comprising a braking resistor electrically coupled to the first motor drive unit and the second motor drive unit. ### Claim 17 (depends on 16) The system of claim 16, wherein the first motor drive unit includes a first programmable logic device configured to receive a first command from the controller and generate first pulse width modulation signals configured to control at least one of the first electric motor or the second electric motor in response to the first command from the controller, and wherein the second motor drive unit includes a second programmable logic device configured to receive a second command from the controller and generate second pulse width modulation signals configured to control at least one of the third electric motor or the fourth electric motor in response to the second command from the controller. ### Claim 18 (depends on 16) The system of claim 16, further comprising: a first sensor operably coupled to the first electric motor and in communication with the controller; a second sensor operably coupled to the second electric motor and in communication with the controller; a third sensor operably coupled to the third electric motor and in communication with the controller; and a fourth sensor operably coupled to the fourth electric motor and in communication with the controller. ### Claim 19 (depends on 15) The system of claim 15, wherein the first motor drive unit is configured to either the first electric motor non-simultaneously with the second electric motor, and wherein the second motor drive unit is configured to drive the third electric motor non-simultaneously with the fourth electric motor. ### Claim 20 (depends on 19) The system of claim 19, wherein the first electric motor is configured to actuate a nose landing gear bay door, and wherein the second electric motor is configured to actuate a nose landing gear between a landing gear up position and a landing gear down position.