Method and apparatus for satellite positioning of earth-moving equipment

• US 20060230645A1
• Filed: 04/15/2005
• Published: 10/19/2006
• Est. Priority Date: 04/15/2005
• Status: Active Grant

• Current Assignee: Topcon Positioning Systems Incorporated (Topcon Corporation)
• Original Assignee: Topcon Positioning Systems Incorporated (Topcon Corporation)
• Inventors: McCain, Steven Daniel
• Granted Patent: US 7,640,683 B2
• Time in Patent Office: Days
• US Class Current: 37/348
• CPC Class Codes: E02F 3/437 providing automatic sequences of movements, e.g. linear excavation, keeping dipper angle constant

Abstract

A method and apparatus for using satellite positioning systems to more precisely locate the position of a portion of an attachment on an earthmoving machine is disclosed. More specifically, satellite positioning system antennas are mounted to an arm or other point relative to the arm of an illustrative excavator. A reference point relative to these antennas is used to determine the precise location of a portion of an attachment to the excavator, such as the prongs of a bucket. In one embodiment, an angle sensor or inclinometer is used to ascertain the position of the prongs when the bucket is scooped. In another embodiment, an angle sensor or inclinometer is used to measure the tilt of the body of the excavator, such as would occur when the excavator is resting on a sloped surface.

Claims

1. Apparatus comprising:

a first arm;

a second arm rotatably connected to said first arm;

an attachment connected to said second arm;

at least a first satellite positioning system receive antenna attached to a known location relative to said second arm;

means for determining the position of said at least a first satellite positioning system receive antenna; and

means for determining the position of a portion of said attachment as a function of said position of said at least a first positioning system receive antenna.

2. The apparatus of claim 1 further comprising a second satellite positioning system receive antenna attached to a known location relative to said second arm.

3. The apparatus of claim 2 further comprising a third satellite positioning system receive antenna attached to a known location relative to said second arm.

4. The apparatus of claim 1 further comprising at least a first inclinometer for determining the inclination of at least a first portion of said apparatus.

5. The apparatus of claim 1 wherein said first arm comprises a boom of an excavator;

said second arm comprises the stick of said excavator; and

said attachment comprises a bucket of an excavator.

6. The apparatus of claim 5 wherein said first arm and said second arm are attached to said stick.

7. The apparatus of claim 1 wherein said portion of said attachment comprises one or more prongs of said bucket.

8. The apparatus of claim 1 wherein said second arm is connected to said first arm at a pivot point about which said second arm may pivot.

9. The apparatus of claim 1 wherein said satellite positioning system comprises the Global Positioning System (GPS).

10. The apparatus of claim 1 wherein said satellite positioning system comprises the Global Orbiting Navigation Satellite System (GLONASS).

11. The method of claim 1 wherein said means for determining the position of said at least a first satellite positioning system receive antenna comprises a satellite positioning system receiver.

12. The method of claim 11 further comprising a radio receiver adapted to receive a correction signal from a base station.

13. The apparatus of claim 1 wherein said means for determining the position of a portion of said attachment comprises a computer for geometrically determining the position of said portion from a point relative to said least a first positioning system receive antenna.

14. The apparatus of claim 1 wherein said means for determining the position of a portion of said attachment comprises:

means for determining the orientation of a plane in which a point at a known location relative to said at least a first positioning system receive antenna is located.

15. The apparatus of claim 14 wherein said means for determining the orientation of a plane comprises:

means for determining a first position of said point, said first position of said point a function of a first position of said first arm;

means for determining a second position of said point, said second position of said point a function of a second position of said first arm; and

means for determining a third position of said point, said third position of said point a function of a third position of said first arm.

16. A method for use in controlling an earthmoving machine, said earthmoving machine comprising a first arm, a second arm rotatably connected to said first arm, and an attachment connected to said second arm, said method comprising:

determining the position of at least two satellite positioning system receive antennas disposed at known locations relative to said second arm; and

determining the position of a portion of said attachment as a function of said position of said at least two positioning system receive antennas.

17. The method of claim 16 wherein the step of determining the position of a portion of said attachment comprises:

determining the position of a known point relative to said positions of said at least two positioning system receive antennas;

determining an offset angle relative to a known plane, said offset angle associated with said second arm;

determining a longitudinal distance between a portion of said attachment and said position of said known point, said longitudinal distance a function of said offset angle; and

determining a vertical distance between said portion of said attachment and said known point, said vertical distance a function of said offset angle.

18. The method of claim 17 wherein said longitudinal distance and said vertical distance are determined as a function of an angle of rotation of said portion.

19. The method of claim 16 further comprising:

determining the orientation of a plane in which a point at a known location relative to said at least a first positioning system receive antenna is located.

20. The method of claim 19 wherein said step of determining the orientation of a plane comprises:

determining a first position of said point, said first position of said point a function of a first position of said first arm;

determining a second position of said point, said second position of said point a function of a second position of said first arm; and

determining a third position of said point, said third position of said point a function of a third position of said first arm.

24. The earthmoving machine of claim 20 wherein each antenna in said plurality of satellite positioning system receive antennas is attached to said stick.

21. An earthmoving machine comprising:

an arm, said arm comprising a tool;

a plurality of satellite positioning system receive antennas, each antenna in said plurality attached to a known location relative to said arm;

at least a first positioning system receiver for determining the position of each antenna in said plurality of antennas; and

at least a first circuit for geometrically determining the position of a portion of said tool as a function of the position of said plurality of antennas.

22. The earthmoving machine of claim 21 wherein said arm comprises a stick of an excavator.

23. The earthmoving machine of claim 22 wherein said tool comprises a bucket of an excavator.

25. The earthmoving machine of claim 21 wherein said portion of said tool comprises one or more prongs of said bucket.

26. The earthmoving machine of claim 21 wherein said arm is connected to a second arm of said earthmoving machine at a pivot point about which said load-bearing arm may pivot.

27. The earthmoving machine of claim 21 wherein said satellite positioning system comprises the Global Positioning System (GPS).

28. The earthmoving machine of claim 21 wherein said satellite positioning system comprises the Global Orbiting Navigation Satellite System (GLONASS).

29. The earthmoving machine of claim 21 further comprising a radio receiver adapted to receive a correction signal from a base station.