Work linkage position determining system

• US 20060124323A1
• Filed: 11/30/2004
• Published: 06/15/2006
• Est. Priority Date: 11/30/2004
• Status: Abandoned Application

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Glover, Clarence Matthew, Padgett, Clayton Lucas
• Application Number:
  US10/998,737
• Publication Number:
  US 20060124323A1
• Time in Patent Office: Days
• US Class Current: 172/2
• CPC Class Codes: E02F 9/26 Indicating devices E02F5/145 takes precedence
• CPC Class Codes: E02F 9/265 with follow-up actions (e.g. control signals sent to actuate the work tool)

Abstract

A position determining system for a work machine includes a body and a work linkage. A laser receiver may be configured to detect a laser beam and communicate a height signal indicative of the height of the work machine body relative to the laser beam. A swing frame may pivot in a lateral direction relative to the work machine body about a swing axis and may include a swing frame sensor configured to monitor the swing position. A portion of a digging arm may pivot in the lateral direction about the swing axis and may include at least one digging arm sensor configured to monitor the position of the digging arm. A control module may be in communication with the laser receiver, the swing frame sensor, and the digging arm sensor. The control module may be configured to determine a position of the work linkage relative to the desired grade.

Claims

1. A position determining system for a work machine having a body and a work linkage, the position determining system being usable with a laser beam generator configured to generate a laser beam indicative of a desired grade, comprising:

a laser receiver disposed on the work machine body and configured to detect the laser beam, the laser receiver being configured to communicate a height signal indicative of the height of the work machine body relative to the laser beam;

a work linkage supported by and extending from the work machine body, the work linkage including

a swing frame configured to pivot in a lateral direction relative to the work machine body about a swing axis,

a swing frame sensor configured to monitor the swing position of the swing frame,

a digging arm associated with the swing frame, at least a portion of the digging arm being configured to pivot in the lateral direction about the swing axis, and

at least one digging arm sensor associated with the digging arm, the at least one digging arm sensor being configured to monitor the position of the digging arm; and

a control module in communication with the laser receiver, the swing frame sensor, and the at least one digging arm sensor, the control module being configured to determine a position of a portion of the work linkage relative to the desired grade.

2. The position determining system of claim 1, including an inclinometer disposed on the work machine to monitor the pitch and the roll of the work machine body, wherein the control module is configured to determine the position of a portion of the work linkage relative to the desired grade based on the monitored pitch and roll.

3. The position determining system of claim 1, including a swing frame actuator configured to pivot the swing frame and the digging arm about the swing axis.

4. The position determining system of claim 1, including a display associated with the control module and configured to convey information regarding the position of the portion of the work linkage relative to the desired grade to an operator.

5. The position determining system of claim 4, wherein the display includes a series of lights indicating whether the work linkage is above or below the desired grade.

6. The position determining system of claim 1, including an audible indicator configured to indicate whether the work linkage location relative to the desired grade.

7. The position determining system of claim 1, wherein the digging arm includes a work implement having a work implement tip, wherein the control module is configured to determine a position of the work implement tip relative to the desired grade.

8. The position determining system of claim 1, wherein the digging arm includes:

a boom connected to the swing frame;

a stick connected to the boom; and

a work implement connected to the stick.

9. The position determining system of claim 8, wherein the at least one digging arm sensor includes:

a boom sensor associated with the boom and configured to monitor a position of the boom;

a stick sensor associated with the stick and configured to monitor a position of the stick; and

a work implement sensor associated with the work implement and configured to monitor a position of the work implement.

10. The position determining system of claim 8, wherein the boom, stick, and work implement sensors are position sensors associated with actuators configured to actuate the boom, stick, and work implement.

11. The position determining system of claim 10, wherein the position sensors are in-cylinder position sensors.

12. The position determining system of claim 8, wherein the stick is an extendable stick.

13. The position determining system of claim 12, wherein the at least one digging arm sensor includes:

a boom sensor associated with the boom and configured to monitor a position of the boom;

a stick sensor associated with the stick and configured to monitor a position of the stick;

an E-stick sensor associated with the extendable stick and configured to monitor an extension of the extendable stick; and

a work implement sensor associated with the work implement and configured to monitor a position of the work implement.

14. The position determining system of claim 1, wherein the height of the laser receiver is automatically controlled by the control module to correspond to the height of the laser beam as the work machine moves over a work site.

15. A method for determining the position of a work implement on a work machine relative to a desired grade defined by a laser beam, the work machine having a body and a work linkage, comprising:

detecting the laser beam at a laser receiver;

communicating a height signal based on the laser beam from the laser receiver, the height signal being indicative of a position of the work machine body relative to the laser beam;

pivoting a swing frame of the work linkage in a lateral direction relative to the work machine body about a swing axis;

monitoring the swing position of the swing frame;

communicating a signal indicative of the position of the swing frame;

monitoring a position of a digging arm of the work linkage with at least one digging arm sensor;

communicating a signal indicative of the position of the digging arm; and

determining a position of a portion of the work linkage relative to the desired grade.

16. The method of claim 15, wherein determining the position of the portion of the work linkage includes determining the position of a tip of a work implement relative to the desired grade.

17. The method of claim 15, including:

monitoring the pitch and the roll of the work machine; and

determining the position of the portion of the work linkage relative to the desired grade based on the monitored pitch and roll.

18. The method of claim 15, including pivoting the swing frame and the digging arm about the swing axis with a swing frame actuator.

19. The method of claim 15, including communicating a display signal to a display indicative of the position of the portion of the work linkage.

20. The method of claim 19, including indicating whether the digging arm is above or below the desired grade using a display including a series of lights.

21. The method of claim 20, wherein the lights are LEDs.

22. The method of claim 20, including generating an audible signal that indicates the location of the digging arm relative to the desired grade.

23. The method of claim 15, wherein monitoring the position of the digging arm includes:

monitoring a position of a boom with a boom sensor;

monitoring a position of a stick with a stick sensor; and

monitoring a position of a work implement with a work implement sensor.

24. The method of claim 23, wherein monitoring the position of the digging arm includes monitoring a position of an extendable stick with an E-stick sensor.

25. The method of claim 23, wherein the boom sensor, the stick sensor, and the work implement sensor are position sensors configured to monitor the extension of actuators associated with the boom, the stick, and the work implement.

26. A backhoe, comprising:

a backhoe body;

a work linkage supported by and extending from the backhoe body, the work linkage including a swing frame, a boom, a stick, and a work implement, wherein the swing frame is configured to pivot in a lateral direction relative to the backhoe body about a swing axis, and wherein the boom, the stick, and the work implement are supported by the swing frame;

a swing frame sensor configured to monitor the swing position of the swing frame;

a boom sensor, a stick sensor, and a work implement sensor configured to monitor a position of the boom, the stick, and the work implement, respectively;

a laser receiver disposed on the backhoe body and configured to detect a laser beam, the laser receiver being configured to communicate a height signal indicative of the height of the backhoe body relative to the laser beam; and

a control module in communication with the laser receiver, the swing frame sensor, the boom sensor, the stick sensor, and the work implement sensor, the control module being configured to determine a position of a portion of the work implement relative to the desired grade.

27. The backhoe of claim 26, including an inclinometer disposed on the backhoe to monitor the pitch and the roll of the backhoe, wherein the control module is configured to determine the position of the portion of the work implement relative to the desired grade based on the monitored pitch and roll.

28. The backhoe of claim 26, including a swing frame actuator configured to pivot the work linkage in a lateral direction relative to the backhoe body.

29. The backhoe of claim 26, including a display associated with the control module and configured to convey information regarding the position of the portion of the work implement relative to the desired grade to an operator.

30. The backhoe of claim 26, wherein the display is a light display indicating whether the portion of the work implement is above or below the desired grade.

31. The backhoe of claim 26, wherein the control module is configured to determine the position of a tip of the work implement relative to the desired grade.

32. The backhoe of claim 26, wherein the display includes an audible indicator indicating whether the portion of the work implement is above or below the desired grade.

33. The backhoe of claim 26, wherein the stick is an extendable stick and an E-stick sensor is configured to monitor a position of the extendable stick.