System and method for load control of a lift arm

Patent metadata

Field	Value
Publication number	US-11898326-B2
Application number	US-202217730673-A
Country	US
Kind code	B2
Filing date	Apr 27, 2022
Priority date	Apr 27, 2022
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

An arm load control system for a work vehicle including a controller comprising a memory and a processor. The controller is configured to determine whether a lift arm is in a maximum load configuration based on a position of the lift arm relative to a chassis of the work vehicle and output a control signal to a propulsion assembly of the work vehicle indicative of instructions to adjust a tractive effort of the work vehicle based on whether the lift arm is in the maximum load configuration.

First claim

The invention claimed is:

1. An arm load control system for a work vehicle, comprising:
a controller comprising a memory and a processor, wherein the controller is configured to:
determine whether a lift arm is in a maximum load configuration corresponding to engagement between the lift arm and a chassis of the work vehicle or a mechanical stop coupled to the chassis based on a position of the lift arm relative to the chassis of the work vehicle; and
output a control signal to a propulsion assembly of the work vehicle indicative of instructions to adjust a tractive effort of the work vehicle based on whether the lift arm is in the maximum load configuration.

2. The arm load control system of claim 1 , comprising an arm position sensor communicatively coupled to the controller, wherein the arm position sensor is configured to output a sensor signal indicative of the position of the lift arm relative to the chassis, and the controller is configured to receive the sensor signal.

3. The arm load control system of claim 2 , wherein the sensor signal is indicative of engagement of the lift arm with the chassis or the mechanical stop coupled to the chassis, disengagement of the lift arm from the chassis or the mechanical stop, or a combination thereof.

4. The arm load control system of claim 1 , wherein the lift arm is configured to transfer a portion of a horizontal load exerted onto the lift arm to the chassis.

5. The arm load control system of claim 1 , wherein the control signal is indicative of instructions to decrease a flow of hydraulic fluid to one or more hydraulic motors of the propulsion assembly to decrease the tractive effort of the work vehicle.

6. The arm load control system of claim 5 , wherein the control signal is indicative of instructions to close a valve of a valve assembly of the propulsion assembly to decrease the flow of the hydraulic fluid to the one or more hydraulic motors.

7. The arm load control system of claim 1 , wherein the controller is configured to determine a maximum operation tractive effort of the work vehicle based on whether the lift arm is in the maximum load configuration, and the controller is configured to output the control signal to adjust the tractive effort of the work vehicle to less than or equal to the maximum operation tractive effort based on determining the lift arm is not in the maximum load configuration.

8. A method for controlling a lift arm of a work vehicle, comprising:
receiving, via a controller, a first signal indicative of a position of the lift arm;
determining, via the controller, whether the lift arm is in a maximum load configuration corresponding to engagement between the lift arm and a chassis of the work vehicle or a mechanical stop coupled to the chassis based on the position of the lift arm relative to the chassis; and
outputting, via the controller, a control signal indicative of instructions to adjust a tractive effort of the work vehicle based on the determination.

9. The method of claim 8 , comprising:
determining, via the controller, the lift arm is in the maximum load configuration;
retrieving, via the controller, a maximum load rating of the lift arm;
determining, via the controller, a maximum tractive effort of the work vehicle based on the maximum load rating; and
outputting, via the controller, the control signal indicative of instructions to operate at the maximum tractive effort of the work vehicle.

10. The method of claim 8 , wherein the first signal is received, via the controller, from an arm position sensor integrated in the chassis.

11. The method of claim 10 , wherein the first signal is indicative of engagement of the lift arm with the chassis or a mechanical stop coupled to the chassis, disengagement of the lift arm from the chassis or the mechanical stop, or a combination thereof.

12. The method of claim 8 , comprising:
decrease or change the tractive effort of the work vehicle based on the first signal being indicative of the position of the lift arm not being in the maximum load configuration, wherein the first signal is received from a sensor integrated in a pivot joint of the lift arm.

13. The method of claim 8 , wherein the first signal indicative of the position of the lift arm is received from a sensor integrated in one or more hydraulic cylinder lifts of the arm, wherein detecting an extension from the sensor is indicative of the lift arm not being in a lowered position.

14. The method of claim 8 , wherein the control signal is indicative of instructions to decrease a flow of hydraulic fluid to one or more hydraulic motors of a propulsion assembly to decrease the tractive effort of the work vehicle.

15. The method of claim 14 , wherein the control signal is indicative of instructions to close a valve of a valve assembly of the propulsion assembly to decrease the flow of hydraulic fluid to the one or more hydraulic motors.

16. An apparatus comprising:
at least one non-transitory, tangible, machine-readable medium having instructions encoded thereon for execution by a processor, the instructions comprising:
instructions to determine whether a lift arm is in a maximum load configuration corresponding to engagement between the lift arm and a chassis of a work vehicle or a mechanical stop coupled to the chassis based on a position of the lift arm relative to the chassis; and
instructions to output a control signal to a propulsion assembly of the work vehicle indicative of instructions to adjust a tractive effort of the work vehicle based on whether the lift arm is in the maximum load configuration.

17. The apparatus of claim 16 , wherein the instructions to adjust the tractive effort of the work vehicle comprise instructions to decrease the tractive effort or change the tractive effort to zero based on determining the position of the lift arm is not in the maximum load configuration.

18. The apparatus of claim 16 , wherein the instructions to determine whether the lift arm is in the maximum load configuration comprise:
instructions to receive a first signal from a sensor integrated with the chassis, a mechanical stop of the chassis, a hydraulic cylinder of the lift arm, or a pivot joint of the lift arm, the first sensor signal indicative of the position of the lift arm relative to the chassis.

19. The apparatus of claim 18 , wherein the instructions to output the control signal indicative of instructions to adjust the tractive effort comprise:
instructions to determine the lift arm is not in a maximum load configuration based on the first signal; and
instructions to determine an adjusted tractive effort of the work vehicle based on the lift arm not being in the maximum load configuration.

20. The apparatus of claim 18 , wherein the instructions to output the control signal comprise:
instructions to determine the lift arm is in the maximum load configuration based on the first signal indicative of engagement between the lift arm and the chassis or the mechanical stop of the chassis; and
instructions to operate at a maximum tractive effort based on the lift arm being in the maximum load configuration.

Assignees

• Cnh Ind America Llc

Inventors

• Lewis Brady Dorr

Classifications

• E02F9/2221 Primary

  Control of flow rate; Load sensing arrangements (E02F9/2203 take precedence over E02F9/2221) · CPC title

• E02F3/845

  using mechanical sensors to determine the blade position, e.g. inclinometers, gyroscopes, pendulums · CPC title

• E02F9/2246

  Control of prime movers, e.g. depending on the hydraulic load of work tools · CPC title

• E02F9/2267

  Valves or distributors (position of valves arrangements on upper-structures E02F9/0875) · CPC title

• F15B2211/6336

  representing a state of the output member, e.g. position, speed or acceleration · CPC title