Systems and methods for operating unmanned aerial vehicles

Patent metadata

Field	Value
Publication number	US-11275389-B2
Application number	US-201916271530-A
Country	US
Kind code	B2
Filing date	Feb 8, 2019
Priority date	Aug 17, 2016
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A method of controlling an unmanned aerial vehicle includes receiving a first signal including information relating to a payload of the unmanned aerial vehicle, retrieving a predetermined value from a memory of the unmanned aerial vehicle based on the information of the first signal, and generating a second signal for changing a configuration of an arm of the unmanned aerial vehicle to change a distance of at least one of a plurality of propulsion units of the unmanned aerial vehicle corresponding to the arm from a reference point on a central body of the unmanned aerial vehicle based on the predetermined value.

First claim

What is claimed is:

1. A method of controlling an unmanned aerial vehicle, comprising:
receiving a first signal comprising information relating to a payload of the unmanned aerial vehicle, the information including at least one of a payload type or a payload configuration state of the payload, wherein the unmanned aerial vehicle comprises:
a plurality of arms, at least one of the plurality of arms extending from a central body; and
a plurality of propulsion units, at least one of the plurality of propulsion units being positioned on a corresponding arm of the plurality of arms at a distance from a reference point on the central body;

accessing a table stored in a memory of the unmanned aerial vehicle using the information including the at least one of the payload type or the payload configuration state to obtain a predetermined value indicating a change in length of one or more of the plurality of arms, the change in length of the one or more of the plurality of arms corresponding to the at least one of the payload type or the payload configuration state; and
generating a second signal for changing a configuration of the one or more of the plurality of arms based on the predetermined value to change the distance of the at least one of the plurality of propulsion units from the reference point.

2. The method of claim 1 , wherein receiving the first signal comprises receiving information indicating the payload type of the payload.

3. The method of claim 1 , wherein receiving the first signal comprises receiving information of the payload configuration state of the payload.

4. The method of claim 1 , wherein receiving the first signal comprises receiving the first signal from at least one sensor on the unmanned aerial vehicle.

5. The method of claim 1 , further comprising:
performing a calculation using the predetermined value;
wherein generating the second signal for changing the configuration of the one or more of the plurality of arms based on the predetermined value comprises generating a signal based on a result of the calculation.

6. The method of claim 1 , wherein generating the second signal for changing the configuration of the one or more of the plurality of arms based on the predetermined value comprises generating a signal comprising an instruction to change a length of the one or more of the plurality of arms.

7. The method of claim 1 , wherein:
the information is measured by one or more sensors of the unmanned aerial vehicle and/or derived from values measured by the one or more sensors and indicates:
the payload configuration state prior to and after a configuration change; or
that a telescope feature of the payload will be, is being, or has been extended or retracted.

8. A unmanned aerial vehicle comprising:
a central body;
a plurality of arms, at least one of the plurality of arms extending outwardly from the central body; and
a plurality of propulsion units coupled to corresponding arms of the plurality of arms, a distance of at least one of the plurality of propulsion units from a reference point on the central body being adjustable by manipulating a configuration of at least one of the corresponding arms in response to a change in a center of gravity of the unmanned aerial vehicle, including, in response to the center of gravity being outside a thrust shifting zone that is a largest area enclosed by lines connecting rotational axes of rotors of the plurality of propulsion units:
extending one or more of the plurality of arms to expand the thrust shifting zone to cause the center of gravity to be within the thrust shifting zone;
calculating values of angular velocities of rotors of the plurality of propulsion units;
comparing the calculated values with a threshold; and
controlling the rotors according to the comparison, including:
in response to one of the calculated values being greater than the threshold:
setting an angular velocity of a corresponding rotor corresponding to the one of the calculated values to the threshold; and
adjusting an arm length of one of the arms corresponding to the corresponding rotor; or

in response to the calculated values being smaller than or equal to the threshold, setting the angular velocities of the rotors to the calculated values without adjusting an arm length of any of the arms.

9. The unmanned aerial vehicle of claim 8 , wherein the distance of the at least one of the plurality of propulsion units from the reference point comprises a distance from a rotational axis of the rotor of the at least one of the plurality of propulsion units to the reference point.

10. The unmanned aerial vehicle of claim 8 , further comprising:
a plurality of sets of rotor blades;
wherein:
each set of the plurality of sets of rotor blades is coupled to a corresponding one of the plurality of rotors; and
an angular velocity of at least one set of the plurality of sets of rotor blades is adjustable in response to the change in the center of gravity of the unmanned aerial vehicle.

11. The unmanned aerial vehicle of claim 8 , further comprising:
a payload;
wherein the change in the center of gravity of the unmanned aerial vehicle comprises a change in a configuration of the payload.

12. The unmanned aerial vehicle of claim 11 , wherein the payload comprises a telescoping feature.

13. The unmanned aerial vehicle of claim 8 , further comprising:
one or more sensors; and
one or more processors configured to receive a first signal comprising information relating to a payload of the unmanned aerial vehicle;
wherein the information is measured by the one or more sensors and/or derived from values measured by the one or more sensors, the information including at least one of a payload type or a payload configuration state of the payload, and indicating:
the payload configuration state prior to and after a configuration change; or
that a telescope feature of the payload that will be, is being, or has been extended or retracted.

14. A method of operating an unmanned aerial vehicle, comprising:
receiving a first signal indicating a change in a center of gravity of the unmanned aerial vehicle, wherein the unmanned aerial vehicle comprises:
a central body;
a plurality of arms, at least one of the plurality of arms extending outwardly from the central body; and
a plurality of propulsion units, the plurality of propulsion units being coupled to corresponding arms of the plurality of arms; and

adjusting a distance of at least one of the plurality of propulsion units from the central body by manipulating a configuration of at least one of the corresponding arms in response to the change in the center of gravity of the unmanned aerial vehicle, including, in response to the center of gravity being outside a thrust shifting zone that is a largest area enclosed by lines connecting rotational axes of rotors of the plurality of propulsion units:
extending one or more of the plurality of arms to expand the thrust shifting zone to cause the center of gravity to be within the thrust shifting zone;
calculating values of angular velocities of rotors of the plurality of propulsion units;
comparing the calculated values with a threshold; and
controlling the rotors according to the comparison, including:
in response to one of the calculated values being greater than the threshold:
setting an angular velocity of a corresponding rotor corresponding to the one of the calculated values to the threshold; and
adjusting an arm length of one of the arms corresponding to the corresponding rotor; or

in response to the calculated values being smaller than or equal to the threshold

Assignees

• Sz Dji Technology Co Ltd

Inventors

• Qu Zongyao
• Wu Tao

Classifications

• B64U2201/10

  autonomous, i.e. by navigating independently from ground or air stations, e.g. by using inertial navigation systems [INS] · CPC title

• B64U2201/20

  Remote controls · CPC title

• B64U2201/00

  UAVs characterised by their flight controls · CPC title

• B64U30/20 Primary

  Rotors; Rotor supports · CPC title

• G05D1/0094

  involving pointing a payload, e.g. camera, weapon, sensor, towards a fixed or moving target · CPC title