System and method for estimating quantity of payload

Patent metadata

Field	Value
Publication number	US-9841312-B2
Application number	US-201414558821-A
Country	US
Kind code	B2
Filing date	Dec 3, 2014
Priority date	Dec 3, 2014
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

A method for estimating a quantity of a payload within a bed of a wagon coupled to a machine is provided. The method includes raising the bed of the wagon to a predetermined height. The method includes receiving a pressure signal indicative of a pressure in a hoist cylinder coupled to the bed of the wagon. The method also includes receiving a load signal indicative of a load at a hitch of the wagon. The method further includes estimating the quantity of the payload in the bed of the wagon based, at least in part, on a predetermined relationship between the pressure signal and the load signal.

First claim

What is claimed is:

1. A method for estimating a quantity of a payload in a bed of a wagon coupled to a machine, the method comprising:
raising the bed of the wagon to a predetermined height;
receiving a pressure signal indicative of a pressure in a hoist cylinder coupled to the wagon in response to the bed of the wagon being raised to the predetermined height, the hoist cylinder being directly coupled to the wagon of the machine wherein a first end of the hoist cylinder is attached to a chassis of the machine and a second end of the hoist cylinder is attached to the bed of the wagon;
receiving a load signal indicative of a load at a hitch of the wagon; and
estimating the quantity of the payload in the bed of the wagon based, at least in part, on a predetermined relationship between the pressure signal and the load signal.

2. The method of claim 1 , wherein the estimating step further includes:
computing the quantity of the payload in the bed of the wagon based on the predetermined relationship.

3. The method of claim 1 , wherein the estimating step further includes:
comparing the pressure signal and the load signal with a pre-calibrated dataset.

4. The method of claim 1 , wherein the raising step further includes:
activating the hoist cylinder to raise the bed of the wagon to the predetermined height.

5. The method of claim 1 further comprising:
displaying the estimated quantity of the payload on a display device.

6. A machine comprising:
a frame having a hitch;
a wagon coupled to the frame via the hitch, the wagon having a bed, wherein the bed is configured to be adjusted in height via a hoist cylinder;
at least one pressure sensor coupled to the hoist cylinder of the wagon, the at least one pressure sensor configured to generate a pressure signal indicative of a pressure in the hoist cylinder, the hoist cylinder being directly coupled to the wagon of the machine wherein a first end of the hoist cylinder is attached to a chassis of the machine and a second end of the hoist cylinder is attached to the bed of the wagon; and
a measurement module communicably coupled to the at least one pressure sensor, the measurement module configured to:
receive the pressure signal from the at least one pressure sensor in response to the bed of the wagon being raised to a predetermined height via the hoist cylinder;
receive a load signal indicative of a load at the hitch of the wagon; and
estimating a quantity of a payload in the bed of the wagon based, at least in part, on a predetermined relationship between the pressure signal and the load signal.

7. The machine of claim 6 , wherein the measurement module is configured to:
compute the quantity of the payload in the bed of the wagon based on the predetermined relationship.

8. The machine of claim 6 , wherein the measurement module is configured to:
compare the pressure signal and the load signal with a pre-calibrated dataset.

9. The machine of claim 6 , wherein the at least one pressure sensor further includes:
a first pressure sensor coupled to a first hoist cylinder; and
a second pressure sensor coupled to a second hoist cylinder, wherein the first hoist cylinder and the second hoist cylinder are positioned on either sides of the wagon.

10. The machine of claim 6 , wherein the hoist cylinder is configured to:
raise the bed of the wagon to a predetermined height for receiving the pressure signal.

11. The machine of claim 6 further comprising:
a payload determination module communicably coupled to the measurement module, the payload determination module configured to generate the load signal.

12. The machine of claim 6 further comprising:
a display device communicably coupled to the measurement module, the display device configured to display the estimated quantity of the payload.

13. The machine of claim 6 , wherein the wagon is of an unsuspended type.

14. A system for a wagon coupled to a machine, the system comprising:
at least one pressure sensor coupled to a hoist cylinder of the wagon wherein the hoist cylinder is configured to adjust a height of a bed of the wagon, the at least one pressure sensor configured to generate a pressure signal indicative of a pressure in the hoist cylinder, the hoist cylinder being directly coupled to the wagon of the machine wherein a first end of the hoist cylinder is attached to a chassis of the machine and a second end of the hoist cylinder is attached to the bed of the wagon; and
a measurement module communicably coupled to the at least one pressure sensor, the measurement module configured to:
receive the pressure signal from the at least one pressure sensor in response to the bed of the wagon being raised to a predetermined height via the hoist cylinder;
receive a load signal indicative of a load at a hitch of the wagon; and
estimate a quantity of a payload in a bed of the wagon based, at least in part, on a predetermined relationship between the pressure signal and the load signal.

15. The system of claim 14 , wherein the measurement module is configured to:
compute the quantity of the payload in the bed of the wagon based on the predetermined relationship.

16. The system of claim 14 , wherein the measurement module is configured to:
compare the pressure signal and the load signal with a pre-calibrated dataset.

17. The system of claim 14 , wherein the at least one pressure sensor further includes:
a first pressure sensor coupled to a first hoist cylinder; and
a second pressure sensor coupled to a second hoist cylinder, wherein the first hoist cylinder and the second hoist cylinder are positioned on either sides of the wagon.

18. The system of claim 14 , wherein the hoist cylinder is configured to:
raise the bed of the wagon to a predetermined height for receiving the pressure signal.

19. The system of claim 14 further comprising:
a payload determination module communicably coupled to the measurement module, the payload determination module configured to generate the load signal.

20. The system of claim 14 further comprising:
a display device communicably coupled to the measurement module, the display device configured to display the estimated quantity of the payload.

21. The method of claim 1 , wherein the first end of the hoist cylinder is hingedly attached to the chassis.

Assignees

• Caterpillar Inc

Inventors

• Vail Robert S
• Brooks Jr Thomas N

Classifications

• G01G19/083 Primary

  lift truck scale · CPC title