Vehicle payload weight display method and system

• US 9,157,215 B2
• Filed: 12/17/2012
• Issued: 10/13/2015
• Est. Priority Date: 12/17/2012
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Stanley, Robert W., Buettner, Jeffrey E.
• Primary Examiner(s): HUNNINGS, TRAVIS R
• Application Number:
  US13/717,301
• Publication Number:
  US 20140167971A1
• Time in Patent Office: 1,030 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: E02F 9/2296 Systems with a variable displacement pump
• CPC Class Codes: E02F 9/264 Sensors and their calibration for indicating the position of the work tool
• CPC Class Codes: G01G 19/083 lift truck scale

Abstract

A computer-based method for displaying an implement payload weight to an operator of a vehicle is provided. The method includes calculating an implement payload weight at a lift position, displaying, at a first location on a monitor, the calculated implement payload weight, determining an accuracy of the calculated implement payload weight, and displaying, at a second location on the monitor proximate to the first location, an accuracy indicator based on the accuracy of the calculated implement payload weight.

Claims

1. A computer-based method for displaying an implement payload weight to an operator of a vehicle, comprising:

calculating, by a processor, an implement payload weight at a lift position of an implement, the lift position being a raised position of the implement above a ground position of the implement in contact with the ground;

displaying, at a first location on a monitor, the calculated implement payload weight;

determining, by the processor, an accuracy of the calculated implement payload weight; and

displaying, at a second location on the monitor proximate to the first location, an accuracy indicator based on the accuracy of the calculated implement payload weight.

2. The method of claim 1, wherein the calculated implement payload weight is displayed as a number and the accuracy indicator is displayed as an icon.

3. The method of claim 2, wherein the icon surrounds the number.

4. The method of claim 3, wherein the icon is green.

5. The method of claim 3, wherein the icon is a rectangle.

6. The method of claim 3, wherein the icon is a green rectangle.

7. The method of claim 1, wherein the accuracy indicator is displayed when the lift position of the implement is within a predetermined lift range.

8. The method of claim 7, wherein the predetermined lift range is between 10% and 90% of a maximum lift position.

9. The method of claim 7, wherein the lift position is measured by a rotation sensor and the maximum lift value is a fully-racked carry position.

10. The method of claim 7, wherein calculating the implement payload weight includes:

determining a pressure difference between an implement lift cylinder head-end pressure and an implement lift cylinder rod-end pressure;

determining a calibration payload pressure difference at the lift position based on data associated with a calibration payload weight;

determining a zero payload pressure difference at the lift position based on data associated with a zero payload weight; and

determining the implement payload weight based on the pressure difference, the calibration payload pressure difference, the zero payload pressure difference and the calibration payload weight.

11. The method of claim 10, wherein the implement is a bucket, and the calibration payload weight is a predetermined percentage of a maximum bucket payload weight.

12. The method of claim 11, wherein the predetermined percentage is about 95%.

13. The method of claim 7, wherein calculating the implement payload weight includes measuring a deflection of a linkage component supporting the implement using an optical sensor.

14. The method of claim 7, wherein calculating the implement payload weight includes measuring a strain of a linkage component supporting the implement using a strain gauge.

15. A system for displaying an implement payload weight to an operator of a vehicle, comprising:

a monitor; and

a controller, coupled to the monitor, including a processor adapted to;

calculate an implement payload weight at a lift position of an implement, the lift position being a raised position of the implement above a ground position of the implement in contact with the ground,

cause the calculated implement payload weight to be displayed on the monitor at a first location,

determine an accuracy of the calculated implement payload weight, and

cause an accuracy indicator to be displayed on the monitor, at a second location proximate to the first location, based on the accuracy of the calculated implement payload weight.

16. The system of claim 15, wherein the calculated implement payload weight is displayed as a number and the accuracy indicator is displayed as an icon.

17. The method of claim 16, wherein the icon is a green rectangle that surrounds the number.

18. The system of claim 15, wherein the accuracy indicator is displayed when the lift position of the implement is within a predetermined lift range.

19. The system of claim 15, further comprising a rotation sensor, an optical sensor or a strain gauge coupled to the controller.

20. A system for displaying an implement payload weight to an operator of a vehicle, comprising:

means for calculating an implement payload weight at a lift position of an implement, the lift position being a raised position of the implement above a ground position of the implement in contact with the ground;

means for determining an accuracy of the calculated implement payload weight; and

means for displaying the calculated implement payload weight and an accuracy indicator proximate thereto, the accuracy indicator being based on the accuracy of the calculated implement payload weight.