Outdoor robot and control method therefor

Patent metadata

Field	Value
Publication number	US-12189390-B2
Application number	US-202017642665-A
Country	US
Kind code	B2
Filing date	Jun 4, 2020
Priority date	Sep 12, 2019
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

A outdoor robot includes an execution apparatus and an execution motor for driving the execution apparatus to perform a work task. The control method includes: obtaining a load parameter of the execution motor during running of the outdoor robot; calculating a change rate parameter of a load; and when it is determined that the change rate parameter of the load represents that the load increases and the change rate parameter of the load exceeds a preset threshold range, braking running of the execution apparatus.

First claim

What is claimed is:

1. A control method of an outdoor robot, wherein the control method comprises:
obtaining a load parameter of an execution motor of the outdoor robot during running of the outdoor robot;
obtaining a change rate parameter of a load according to the load parameter; and
in response to determining that the change rate parameter of the load represents that the load increases and the change rate parameter of the load exceeds a preset threshold range, detecting that an obstacle is present on a path of the outdoor robot, and braking an execution apparatus of the outdoor robot.

2. The control method according to claim 1 , wherein the change rate parameter of the load comprises a first derivative or an nth derivative of the load parameter.

3. The control method according to claim 1 , wherein the change rate parameter of the load comprises a change amount of the load parameter within a preset time interval, and in response to determining that a change amount of the load parameter represents that the load increases and the change amount of the load parameter within the preset time interval is greater than or equal to a preset threshold, braking the execution apparatus.

4. The control method according to claim 1 , wherein braking the execution apparatus comprises reducing or stopping a speed output or an energy output of the execution motor.

5. The control method according to claim 1 , wherein the load parameter of the execution motor comprises at least one of a speed of the execution motor, a current of the execution motor, or a torque of the execution motor.

6. The control method according to claim 1 , wherein obtaining the load parameter of the execution motor of the outdoor robot during the running of the outdoor robot comprises:
obtaining a first load parameter at a first time point, and obtaining a second load parameter at a second time point after a preset time interval; and
obtaining the change rate parameter of the load of the execution motor based on a difference between the first load parameter and the second load parameter.

7. The control method according to claim 6 , wherein a range of the preset time interval is 0.1 s to 10 s.

8. The control method according to claim 7 , wherein the range of the preset time interval is 0.1 s to 2 s.

9. The control method according to claim 1 , wherein the outdoor robot further comprises a movement apparatus and a driving motor used for driving the movement apparatus to move, and the control method further comprises: in response to determining that the change rate parameter of the load of the execution motor represents that the load increases and the change rate parameter of the load exceeds the preset threshold range, braking the movement apparatus.

10. An outdoor robot, comprises:
a housing;
a movement apparatus, mounted on the housing, and used for driving the outdoor robot to move;
an execution apparatus and an execution motor, mounted on the housing, the execution motor running to drive the execution apparatus to perform a work task; and
a control apparatus comprising one or more processors and memory, the control apparatus configured to;
control the execution motor to run to drive the execution apparatus to perform the work task;
control the movement apparatus to drive the outdoor robot to move;
obtain a load parameter of the execution motor during running of the outdoor robot;
obtain a change rate parameter of a load according to the load parameter; and
in response to determining that the change rate parameter of the load represents that the load increases and the change rate parameter of the load exceeds a preset threshold range, detect that an obstacle is present on a path of the outdoor robot, and brake the execution apparatus.

11. The outdoor robot according to claim 10 , wherein the change rate parameter of the load comprises a first derivative or an nth derivative of the load parameter.

12. The outdoor robot according to claim 10 , wherein the change rate parameter of the load comprises a change amount of the load parameter within a preset time interval, and in response to determining that a change amount of the load parameter represents that the load increases and the change amount of the load parameter within the preset time interval is greater than or equal to a preset threshold, the control apparatus is further configured to brake the execution apparatus.

13. The outdoor robot according to claim 12 , wherein a range of the preset time interval is 0.1 s to 2 s.

14. The outdoor robot according to claim 10 , wherein the outdoor robot comprises a robotic lawnmower, the execution apparatus comprises a cutting apparatus, and the execution motor comprises a cutting motor.

15. A control method of an outdoor robot, the control method comprising:
detecting a load parameter of an execution motor of an outdoor robot during running of the outdoor robot; and
if a detection result represents that a load changes abruptly in a rise direction, detecting that an obstacle is present on a path of the outdoor robot, and braking an execution apparatus of the outdoor robot.

16. The control method according to claim 15 , wherein a change rate parameter of the load is obtained according to the load parameter, and in response to determining that the change rate parameter of the load represents that the load increases and the change rate parameter of the load exceeds a preset threshold range, the detection result represents that the load changes abruptly in the rise direction.

17. The control method according to claim 16 , wherein the change rate parameter of the load comprises a first derivative or an nth derivative of the load parameter.

18. The control method according to claim 16 , wherein the change rate parameter of the load comprises a change amount of the load parameter within a preset time interval, and in response to determining that a change amount of the load parameter represents that the load increases and the change amount of the load parameter within the preset time interval is greater than or equal to a preset threshold, braking the execution apparatus.

19. The control method according to claim 15 , wherein braking the execution apparatus comprises reducing or stopping a speed output or an energy output of the execution motor.

20. The control method according to claim 15 , wherein the load parameter comprises at least one of a speed of the execution motor, a current of the execution motor, or a torque of the execution motor.

Assignees

• Positec Power Tools Suzhou Co Ltd

Inventors

• Andriolo Paolo
• Testolin Federico
• Dalfra Davide
• Conti Emanuel

Classifications

• G05D1/43

  Control of position or course in two dimensions [2D] · CPC title

• G05B2219/50391

  Robot · CPC title

• G05B19/4155

  characterised by program execution, i.e. part program or machine function execution, e.g. selection of a program · CPC title

• A01B35/30

  Undercarriages · CPC title

• A01D34/828

  Safety devices · CPC title