Method and apparatus for determining the location and orientation of a work machine

• US 5,438,771 A
• Filed: 05/10/1994
• Issued: 08/08/1995
• Est. Priority Date: 05/10/1994
• Status: Expired due to Term

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Sahm, W. Charles, Gudat, Adam J., Henderson, Daniel E.
• Primary Examiner(s): Taylor, Dennis L.
• Assistant Examiner(s): PEZZUTO, ROBERT ERIC
• Application Number:
  US08/241,118
• Time in Patent Office: 455 Days
• Field of Search: 342/25, 342/149, 342/174, 342/191, 342/357, 364/DIG. 1, 364/232.9, 364/230.2, 364/424, 364/458, 364/424.07, 37/348, 37/349, 37/103, 172/4.5, 172/7, 111/903, 111/904
• US Class Current: 37/348
• CPC Class Codes: E02F 3/435 for dipper-arms, backhoes or the like
• CPC Class Codes: E02F 9/2045 Guiding machines along a predetermined path for graders E02F3/841; machines for construction of roads E01C19/004

Abstract

An apparatus is provided for determining the location of a digging implement at a work site. The apparatus includes an undercarriage, a car body rotatably connected to the undercarriage, a receiver connected to the car body, a positioning system for determining the location of the receiver in three dimensional space, the positioning system determining the location of the receiver at a plurality of points along an arc, and a processor for determining the location and orientation of the car body in response to the location of the plurality of points.

Claims

1. An apparatus for determining the location of a digging implement at a work site, comprising:

an undercarriage;

a car body rotatably connected to said undercarriage;

a receiver connected to said car body;

positioning system means for determining the location of said receiver in three dimensional space;

means for rotating said car body whereby said receiver moves through an arc, said positioning system means determining the location of said receiver at a plurality of points along said arc; and

a processing means for determining the location of said car body in response to the location of said plurality of points.

2. The apparatus, as set forth in claim 1, wherein said processing means determines a plane of rotation of said receiver.

3. The apparatus, as set forth in claim 2, wherein said processing means calculates a center of rotation of said receiver.

4. The apparatus, as set forth in claim 1, wherein said processing means determines the location of an intersection of an axis of rotation of said receiver with the ground.

5. The apparatus, as set forth in claim 1, wherein said processing means calculates a table of fore-aft pitch and side-side roll for a complete car body rotation.

6. The apparatus for determining the location of a digging implement at a work site, comprising:

an undercarriage;

a car body rotatably connected to said undercarriage;

an implement linkage connected to said car body;

one or more sensor means for producing linkage signals indicative of the configuration of said implement linkage, said implement linkage including a digging implement;

a receiver connected to said car body;

a positioning means for determining the location of said receiver in three dimensional space;

means for rotating said car body whereby said receiver moves through an arc, said positioning means determining the location of said receiver at a plurality of points along said arc; and

a processing means for determining the location of said digging implement in response three or more of said plurality of points and said linkage signals.

7. The apparatus, as set forth in claim 6, wherein said processing means determines the location of an intersection of an axis of rotation of said receiver with the ground.

8. The apparatus, as set forth in claim 6, wherein said processing means calculates a table of fore-aft pitch and side-side roll for a complete car body rotation.

9. A method for determining the location of a work machine at a work site, the work machine including an undercarriage and a car body rotatably connected to the undercarriage, comprising the steps of:

rotating the car body;

receiving signals from an external reference source;

determining the location of a receiver in three dimensional space as said car body rotates whereby the location of the receiver is determined at a plurality of points along an arc; and

determining the location of said car body in response to the location of three or more of said plurality of points.

10. The method, as set forth in claim 9, including the step of determining a plane of rotation of said receiver.

11. The method, as set forth in claim 10, including the step of calculating a center of rotation of said receiver.

12. The method, as set forth in claim 9, including the step of determining the location of an intersection of an axis of rotation of said receiver with the ground.

13. The method, as set forth in claim 9, including the step of calculating a table of fore-aft pitch and side-side roll for a complete car body rotation.

14. The method, as set forth in claim 9, wherein the work machine includes an implement linkage connected to said car body and a bucket connected to the implement linkage and including the steps of:

producing linkage signals indicative of the configuration of the implement linkage; and

determining the location of the bucket in response to said linkage signals and the location of said plurality of points.

15. An apparatus for determining the location of a digging implement at a work site, comprising:

an undercarriage;

a car body rotatably connected to said undercarriage;

a receiver connected to said car body;

positioning system means for determining the location of said receiver in three dimensional space;

means for rotating said car body whereby said receiver moves through an arc, said positioning system means determining the location of said receiver at a plurality of points along said arc; and

a processing means for determining the orientation of said car body in response to the location of three or more of said plurality of points.

16. The apparatus, as set forth in claim 15, wherein said processing means determines the location of said car body in response to the location of three or more of said plurality of points.

17. A method for determining the location of a work machine at a work site, the work machine including an undercarriage and a car body rotatably connected to the undercarriage, comprising the steps of:

rotating the car body;

receiving signals from an external reference source;

determining the location of a receiver in three dimensional space as said car body rotates whereby the location of the receiver is determined at a plurality of points along an arc; and

determining the orientation of said car body in response to the location of three or more of said plurality of points.

18. The method, as set forth in claim 17, including the step of determining the location of said car body in response to the location of three or more of said plurality of points.