Control system for tool coupling

• US 7,810,260 B2
• Filed: 12/21/2007
• Issued: 10/12/2010
• Est. Priority Date: 12/21/2007
• Status: Active Grant

• Current Assignee: Caterpillar Trimble Control Technologies LLC
• Original Assignee: Caterpillar Trimble Control Technologies LLC
• Inventors: Pope, Richard M., Arumugam, Anand
• Primary Examiner(s): Beach; Thomas A
• Application Number:
  US11/962,203
• Publication Number:
  US 20090158625A1
• Time in Patent Office: 1,026 Days
• Field of Search: 374/03, 374/68, 37408-410, 374/14, 414/423, 414/697, 414/699, 414/700, 414/705, 414/723, 701/50, 172 2- 45
• US Class Current: 37/468
• CPC Class Codes: E02F 3/3677 allowing movement, e.g. rotation or translation, of the tool around or along another axis as the movement implied by the boom or arms, e.g. for tilting buckets
• CPC Class Codes: E02F 3/3681 Rotators
• CPC Class Codes: E02F 3/435 for dipper-arms, backhoes or the like

Abstract

A control system for a tool coupling of the type that attaches a tool to an excavator dipper stick and provides for rotation of the tool with respect to the dipper stick about an axis, and further provides for tilting of the tool, includes a rotation sensor and a tilt sensor. The rotation sensor is mounted on the coupling for determining the amount of rotation of the tool with respect to the dipper stick about an axis. The tilt sensor is mounted on the coupling for determining the amount of tilt of the tool with respect to gravity. A control is responsive to the rotation sensor and to the tilt sensor for determining the orientation of the tool.

Claims

1. A control system for a tool coupling of the type used to attach a tool to an excavator having a boom pivotally attached to a dipper stick, said boom and said dipper stick defining a common plane, the tool coupling being attached to the end of the dipper stick and the tool coupling providing for rotation of the tool with respect to the dipper stick about a rotation axis that is generally in said common plane of said boom and dipper stick, and for tilting of the tool about an axis that is generally perpendicular to the rotation axis, comprising:

a rotation sensor on said coupling for determining the amount of rotation of the tool about said rotation axis with respect to the dipper stick,

a tilt sensor on said coupling for determining the amount of tilt of the tool with respect to gravity, and

a control, responsive to said rotation sensor and to said tilt sensor, for determining the orientation of the tool.

2. The control system of claim 1 in which said tilt sensor determines the amount of tilt of the tool with respect to gravity about two orthogonal axes.

3. The control system of claim 1 in which said control provides an output indicating the rotation of the tool about the rotation axis with respect to the dipper stick and the tilting of the tool with respect to a gravity reference.

4. The control system of claim 3 in which the tool is an excavator bucket having teeth and the control provides an output indicating the rotation of the bucket with respect to the dipper stick and the tilting of the teeth of the bucket with respect to gravity.

5. The control system of claim 4 further comprising a display, and in which the output of the control is provided to a display to assist an operator in controlling the position of the excavator bucket.

6. The control system of claim 4 in which the output of the control is provided to a position control system for controlling the orientation and position of the bucket to effect excavation automatically in a desired manner.

7. A control system for an excavator of the type having a boom extending from the excavator frame, a dipper stick pivotally attached to the boom and extending therefrom, said boom and said dipper stick defining a common plane, a bucket having bucket teeth, and a coupling attaching the bucket to the excavator dipper stick and providing for rotation of the tool about a rotation axis that is generally in said common plane of said boom and dipper stick and generally parallel to said dipper stick, and tilting of the tool about an axis that is generally perpendicular to the rotation axis, comprising:

a rotation sensor on said coupling for determining the amount of rotation of the bucket about said rotation axis with respect to the dipper stick, and

a tilt sensor on said coupling for determining the amount of tilt of the bucket with respect to gravity,

a control, responsive to said rotation sensor and to said tilt sensor, and further responsive to a positioning system on said excavator, for determining the position and orientation of the teeth of the bucket and for controlling movement of the teeth of the bucket to excavate in a desired manner.

8. The control system of claim 7 in which said in which said tilt sensor determines the tilt of the bucket with respect to a gravity reference in two orthogonal axes.

9. The control system of claim 7 in which said control provides an output indicating the rotation of the bucket about the rotation axis with respect to the dipper stick and the tilting of the bucket with respect to a gravity reference.

10. The control system of claim 7 in which the output of the control is provided to a display for viewing by the operator of the excavator.

11. An excavator, comprising:

an excavator frame,

a boom extending from the excavator frame,

a dipper stick pivotally attached to the boom and extending therefrom, said boom and said dipper stick defining a common plane,

a bucket having bucket teeth,

a coupling attaching the bucket to the excavator dipper stick and providing for rotation of the tool with respect to the dipper stick about a rotation axis that is generally in said common plane of said boom and dipper stick and generally parallel to said dipper stick, and for tilting of the bucket about a tilt axis that is generally perpendicular to said rotation axis,

a positioning system on said excavator for determining the location of said coupling,

a rotation sensor on said coupling for determining the amount of rotation of the bucket about said rotation axis,

a tilt sensor on said coupling for determining the amount of tilt of the bucket with respect to gravity, and

a control, responsive to said rotation sensor and to said tilt sensor, and further responsive to a positioning system on said excavator, for determining the position and orientation of the teeth of the bucket and for controlling movement of the teeth of the bucket to excavate at the work site in a desired manner.

12. The excavator of claim 11 in which said tilt sensor determines the tilt of the bucket with respect to a gravity reference in two orthogonal axes.

13. The excavator of claim 12 in which said control provides an output indicating the rotation of the bucket with respect to the dipper stick and the tilting of the bucket with respect to a gravity reference.

14. The excavator of claim 12 in which the output of the control is provided to a display for viewing by the operator of the excavator.

15. A control system for an earth working machine of the type having a boom, and a dipper stick pivotally attached to said boom and extending therefrom, said boom and said dipper stick defining a common plane, a tool having a working portion, and a coupling attaching the tool to the dipper stick and providing for rotation of the tool with respect to the dipper stick about a rotation axis that is generally in said common plane of said boom and dipper stick, and for tilting of the tool about an axis that is generally perpendicular to the rotation axis, comprising:

a rotation sensor on the coupling for determining the amount of rotation of the tool about said rotation axis,

a tilt sensor on the coupling for determining the amount of tilt of the tool with respect to gravity, and

a control, responsive to the rotation sensor and to the tilt sensor, and further responsive to a positioning system on the excavator, for determining the position and orientation of the working portion of the tool and for controlling movement of the working portion of the tool.

16. The control system of claim 15 in which the tilt sensor determines the tilt of the tool with respect to a gravity reference in two orthogonal axes.

17. The control system of claim 15 in which the control provides an output indicating the rotation of the tool with respect to the dipper stick and the tilting of the tool with respect to a gravity reference.

18. The control system of claim 15 in which the output of the control is provided to a display for viewing by the operator of the earth working machine.