Pool cleaning robot

• US 20090057238A1
• Filed: 09/04/2007
• Published: 03/05/2009
• Est. Priority Date: 09/04/2007
• Status: Abandoned Application

• Current Assignee: Maytronics Ltd (Kibbutz Yizreel)
• Original Assignee: Maytronics Ltd (Kibbutz Yizreel)
• Inventors: Garti, Efraim
• Application Number:
  US11/896,611
• Publication Number:
  US 20090057238A1
• Time in Patent Office: Days
• US Class Current: 210/739
• CPC Class Codes: E04H 4/1654 Self-propelled cleaners
• CPC Class Codes: G05D 1/027 comprising intertial navigation means, e.g. azimuth detector inertial navigation G01C21/16; inertial navigation combined with non-inertial navigation instruments G01C21/165

Abstract

A pool cleaning robot adapted to move in a direction along the bottom surface of a pool. The robot comprises a compass, a rate gyroscope, and a controller adapted to determine the orientation of the robot, relative to a reference orientation thereof, based on readings of the compass and the gyroscope.

Claims

1. A pool cleaning robot adapted to move in a direction along the bottom surface of a pool, said robot comprising a compass, a rate gyroscope, and a controller adapted to determine the orientation of the robot, relative to a reference orientation thereof, based on readings of the compass and the gyroscope.

2. A pool cleaning robot according to claim 1, wherein said rate gyroscope is a Micro-Electro-Mechanical System rate gyroscope.

3. A pool cleaning robot according to claim 1, wherein said compass is a digital compass.

4. A pool cleaning robot according to claim 1, wherein said controller is adapted to calculate the average compass reading over a predetermined period of time, compare said average to the gyroscope reading over said predetermined period, and compensate the reading of the rate gyroscope based on the comparison.

5. A pool cleaning robot according to claim 1, further comprising at least one tilt sensor, said controller being adapted to selectively determine, based on the reading of the at least one tilt sensor, the location of the robot based on the readings of the compass alone or based on the readings of the compass and the rate gyroscope.

6. A pool cleaning robot according to claim 1, further comprising a temperature sensor, said controller being adapted to compensate for reading of the rate gyroscope based on the reading of the temperature sensor.

7. A pool cleaning robot according to claim 1, said pool being rectangular, the reference orientation being one of the length and width of the pool.

8. A method of determining the orientation of a pool cleaning robot relative to a reference location, said robot comprising a compass, a rate gyroscope, and a controller adapted to determine said orientation, the method comprising determining said orientation based on readings of the compass and the gyroscope.

9. A method according to claim 8, wherein said rate gyroscope is a Micro-Electro-Mechanical System rate gyroscope.

10. A method according to claim 8, wherein said compass is a digital compass.

11. A method according to claim 8, wherein said controller is adapted to calculate the average compass reading over a predetermined period of time, compare said average to the gyroscope reading over said predetermined period, and compensate the reading of the rate gyroscope based on the comparison.

12. A method according to claim 8, said robot further comprising at least one tilt sensor, said controller being adapted to selectively determine, based on the reading of the at least one tilt sensor, the location of the robot based on the readings of the compass alone or based on the readings of the compass and the rate gyroscope.

13. A method according to claim 8, said robot further comprising a temperature sensor, said controller being adapted to compensate for reading of the rate gyroscope based on the reading of the temperature sensor.

14. A method according to claim 8, said pool being rectangular, the reference orientation being one of the length and width of the pool.

15. A setup system for a pool cleaning system, said pool cleaning system comprising a pool cleaning robot and a control system, said control system comprising a first controller adapted to direct the operation of the robot based on predetermined setup parameters, a second controller, and a user interface having at least one input/output mechanism;

said second controller being adapted to;

(a) communicate with said first controller to provide said setup parameters thereto;

(b) issue commands to the first controller to direct the operation of the robot; and

(c) prompt a user, via said user interface, to perform an operation and/or to provide information, based on which at least some of the operational parameters are determined.

16. A setup system according to claim 15, wherein at least one of said setup parameters is selected from the group comprising one or more dimensions of the pool, cycle time, delay until cycle start, scanning method, whether to log scanning data, and pool shape.

17. A setup system according to claim 15, wherein said control system is adapted to store multiple sets of setup parameters for multiple pools.

18. A setup system according to claim 15, wherein said control system is adapted to store scanning data.

19. A setup system according to claim 18, wherein said control system is adapted to store said scanning information on removable media.

20. A setup system according to claim 15, wherein said user interface further comprises a remote control adapted to communicate with said first controller to provide instructions regarding directing the robot.

21. A setup system according to claim 20, wherein said instructions relate to the orientation of the robot.

22. A setup system according to claim 15, wherein said user interface is adapted to display information regarding the status the robot.

23. A setup system according to claim 22, wherein said information relates to one or more of filter status, alert status, pool information, and cycle status.

24. A setup system for a pool cleaning robot adapted to move in a direction along the bottom surface of a substantially rectangular pool, said robot comprising a controller, adapted to direct the operation of the robot, and digital compass in communication with said controller said controller being adapted to direct the operation of the robot based on geometric parameters of the pool, said setup system being adapted to communicate with said controller to direct the robot to perform the following operations to determine at least some of said parameters:

(a) aligning the robot such that its direction of travel is perpendicular to a sidewall of the pool;

(b) scanning along a straight trajectory for a first predetermined time; and

(c) calculating the average trajectory of the robot measured by the digital compass over the first predetermined time; and

(d) determining at least some of said parameters based on the average trajectory.

25. A setup system according to claim 24, wherein said setup system is further adapted to receive user input based on which the controller performs the alignment.

26. A method for cleaning a bottom surface of a pool, said method comprising the steps of providing a pool cleaning robot comprising a controller adapted to direct its operation, said controller directing operation of the robot such that:

(a) the robot scans in a first scanning direction until a front detection occurs;

(b) after the front detection, the robot reverses direction and performs a straight lap along a path which is shifted, in a first shifting direction perpendicular to that of the first scanning direction, from the previous path;

(c) the robot repeats step (b) for a predetermined number of times;

(d) subsequently, the robot performs a stepped lap, and after the 90°

rotation thereof, scans in a second shifting direction which is opposite the first shifting direction for a distance equal to twice the total amount shifted during step (c);

(e) subsequently, the robot rotates 90°

, and scans until a front detection occurs;

(f) steps (b) through (d) are repeated until a front detection occurs during step (d);

(g) subsequently, the robot reverses direction and scans for a distance equal to the total amount shifted during one iteration of step (c), then rotates 90° and

scans until a front detection occurs; and

(h) subsequently, the robot repeats steps (b) through (f), with the directions of the first and second shifting directions being reversed.

27. A method according to claim 26, wherein said controller further directs operation of the robot such that:

(i) subsequently, the robot performs a stepped lap, and performs a straight lap; and

(j) the robot repeats steps (a) through (i) until a predetermined condition is met.

28. A method according to claim 27, wherein the predetermined condition is selected from the group comprising a predetermined amount of time having elapsed and a predetermined number of complete traversals of the pool floor.

29. A method according to claim 26, said robot further comprising an alignment-detection mechanism.

30. A method according to claim 29, wherein said alignment-detection mechanism comprises a compass and a rate gyroscope.

31. A method according to claim 30, wherein said rate gyroscope is a Micro-Electro-Mechanical System rate gyroscope.

32. A method according to claim 30, wherein said compass is a digital compass.

33. A method according to claim 30, said controller being further adapted to calculate the average compass reading over a predetermined period of time, compare said average to the gyroscope reading over said predetermined period, and compensate the reading of the rate gyroscope based on the comparison.

34. A method according to claim 30, said robot further comprising at least one tilt sensor, said controller being adapted, based on the reading of the at least one tilt sensor, to selectively determine the location of the robot based on the readings of the compass alone or based on the readings of the compass and the rate gyroscope.

35. A method according to claim 30, said robot further comprising a temperature sensor, said controller being adapted to compensate for reading of the rate gyroscope based on the reading of the temperature sensor.

36. A method according to claim 26, wherein previous to step (a), the robot orients itself such that its initial path is parallel to one sidewall of the pool.