Leveling system for lift device

Patent metadata

Field	Value
Publication number	US-11565920-B2
Application number	US-202117164317-A
Country	US
Kind code	B2
Filing date	Feb 1, 2021
Priority date	Apr 8, 2016
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A leveling system for a lift device includes a control system. The control system has programmed instructions to acquire operation data regarding operation of the lift device, fluidly couple a first leveling actuator and a second leveling actuator based on the operation data, acquire an update regarding the operation data, fluidly decouple the first leveling actuator and the second leveling actuator based on the update regarding the operation data, and selectively control the first leveling actuator and the second leveling actuator to (i) selectively reposition a first tractive element and a second tractive element relative to each other about a longitudinal axis defined by the lift device and (ii) selectively reposition the first tractive element and the second tractive element about a first lateral axis defined by the lift device.

First claim

The invention claimed is:

1. A leveling system for a lift device, the leveling system comprising:
a control system having programmed instructions to:
acquire operation data regarding operation of the lift device;
fluidly couple two of a first leveling actuator, a second leveling actuator, a third leveling actuator, and a fourth leveling actuator based on the operation data;
acquire an update regarding the operation data;
fluidly decouple the two of the first leveling actuator, the second leveling actuator, the third leveling actuator, and the fourth leveling actuator based on the update regarding the operation data;
selectively control the first leveling actuator and the second leveling actuator to (i) selectively reposition a first tractive element and a second tractive element relative to each other about a longitudinal axis defined by the lift device and (ii) selectively reposition the first tractive element and the second tractive element about a first lateral axis defined by the lift device; and
selectively control the third leveling actuator and the fourth leveling actuator to (i) selectively reposition a third tractive element and a fourth tractive element relative to each other about the longitudinal axis and (ii) selectively reposition the third tractive element and the fourth tractive element about a second lateral axis defined by the lift device.

2. The leveling system of claim 1 , wherein the operation data includes data regarding at least one of a pitch angle of the lift device, a roll angle of the lift device, a first position of the first leveling actuator, a second position of the second leveling actuator, a third position of the third leveling actuator, a fourth position of the fourth leveling actuator, a position of a boom of the lift device, a drive speed of the lift device, or a load on one or more tractive elements of the lift device.

3. The leveling system of claim 1 , further comprising a sensor configured to acquire the operation data.

4. The leveling system of claim 1 , further comprising the first leveling actuator, the second leveling actuator, the third leveling actuator, and the fourth leveling actuator, wherein the first leveling actuator, the second leveling actuator, the third leveling actuator, and the fourth leveling actuator are configured to couple to a chassis of the lift device.

5. The leveling system of claim 1 , wherein the control system has programmed instructions to fluidly decouple the other two of the first leveling actuator, the second leveling actuator, the third leveling actuator, and the fourth leveling actuator based on the operation data while the two of the first leveling actuator, the second leveling actuator, the third leveling actuator, and the fourth leveling actuator are fluidly coupled.

6. The leveling system of claim 1 , wherein the control system has programmed instructions to fluidly couple the other two of the first leveling actuator, the second leveling actuator, the third leveling actuator, and the fourth leveling actuator based on the update regarding the operation data while the two of the first leveling actuator, the second leveling actuator, the third leveling actuator, and the fourth leveling actuator are fluidly decoupled.

7. The leveling system of claim 1 , wherein the operation data provides an indication of a selection of an operation mode, and wherein the operation mode includes at least one of a transport or stowed mode, a boom operation mode, a calibration mode, or a driving mode.

8. The leveling system of claim 7 , wherein the control system has programmed instructions to fluidly decouple and control the first leveling actuator, the second leveling actuator, the third leveling actuator, and the fourth leveling actuator to reduce an overall height of the lift device to a target height in response to the selection of the transport or stowed mode.

9. The leveling system of claim 7 , wherein the control system has programmed instructions to fluidly decouple and actively control the first leveling actuator, the second leveling actuator, the third leveling actuator, and the fourth leveling actuator to attempt maintain the lift device substantially level while a boom of the lift device is manipulated during the boom operation mode.

10. The leveling system of claim 9 , wherein the control system has programmed instructions to selectively limit a speed of the lift device in the boom operation mode.

11. The leveling system of claim 7 , further comprising a sensor, wherein the control system has programmed instructions to fluidly decouple and control the first leveling actuator, the second leveling actuator, the third leveling actuator, the fourth leveling actuator, and a boom of the lift device to return the first leveling actuator, the second leveling actuator, the third leveling actuator, the fourth leveling actuator, and the boom to a nominal position to facilitate establishing a reference for the sensor in response to the selection of the calibration mode, and wherein the sensor includes at least one of a displacement sensor, a roll sensor, a pitch sensor, or a load sensor.

12. The leveling system of claim 7 , wherein the control system has programmed instructions to selectively limit operation of a boom of the lift device during the driving mode.

13. The leveling system of claim 7 , wherein the control system has programmed instructions to fluidly couple the two of the first leveling actuator, the second leveling actuator, the third leveling actuator, and the fourth leveling actuator to in response to the selection of the driving mode.

14. A method for controlling a leveling system of a lift device, the method comprising:
acquiring, by a control system, operation data regarding operation of the lift device;
fluidly coupling, by the control system, two of a first leveling actuator, a second leveling actuator, a third leveling actuator, and a fourth leveling actuator of the lift device based on the operation data;
acquiring, by the control system, an update regarding the operation data;
fluidly decoupling, by the control system, the two of the first leveling actuator, the second leveling actuator, the third leveling actuator, and the fourth leveling actuator based on the update regarding the operation data;
selectively controlling, by the control system, the first leveling actuator and the second leveling actuator to (i) selectively reposition a first tractive element and a second tractive element relative to each other about a longitudinal axis defined by the lift device and (ii) selectively reposition the first tractive element and the second tractive element about a first lateral axis defined by the lift device; and
selectively controlling, by the control system, the third leveling actuator and the fourth leveling actuator to (i) selectively reposition a third tractive element and a fourth tractive element relative to each other about the longitudinal axis and (ii) selectively reposition the third tractive element and the fourth tractive element about a second lateral axis defined by the lift device.

15. The method of claim 14 , wherein the operation data includes data regarding at least one of a pitch angle of the lift device, a roll angle of the lift device, a first position of the first leveling actuator, a second position of the second leveling actuator, a third position of the third leveling actuator, a fourth position of the fourth leveling actuator, a position of a boom of the lift device, a drive speed of the lift device, or a load on one or more tractive elements of the lift device.

16. The method of claim 14 , wherei

Assignees

• Oshkosh Corp

Inventors

• Hao Jihong
• Puszkiewicz Ignacy

Classifications

• B66C9/00 Primary

  Travelling gear incorporated in or fitted to trolleys or cranes ({for floor-to-roof stacking devices B66F9/072}; for dredgers E02F) · CPC title

• B66F9/065

  non-masted (mobile jacks of the garage type mounted on wheels or rollers B66F5/00) · CPC title

• B60G2400/252

  vertical · CPC title

• B66F13/00

  Common constructional features or accessories · CPC title

• B60G2500/30

  Height or ground clearance · CPC title