Work vehicle stabilizer

• US 7,434,838 B2
• Filed: 06/21/2006
• Issued: 10/14/2008
• Est. Priority Date: 10/20/2003
• Status: Active Grant

• Current Assignee: Blue Leaf IP Incorporated (CNH Industrial N.V.)
• Original Assignee: CNH Industrial America LLC (CNH Industrial N.V.)
• Inventors: Dix, Peter J., Heyne, Dennis J.
• Primary Examiner(s): Ellis; Christopher
• Assistant Examiner(s): WALTERS, JOHN DANIEL
• Application Number:
  US11/471,886
• Publication Number:
  US 20060237958A1
• Time in Patent Office: 846 Days
• Field of Search: 280/764.1, 280/763.1, 700/85, 700/17, 700/32, 700/33, 700/35, 700/56, 700/60, 700/75, 700/245, 700/264
• US Class Current: 280/764.1
• CPC Class Codes: E02F 9/085 Ground-engaging fitting for supporting the machines while working, e.g. outriggers, legs for vehicles in general B60S9/00, for cranes B66C23/78
• CPC Class Codes: E02F 9/2203 Arrangements for controlling the attitude of actuators, e.g. speed, floating function

Abstract

A system for automatically moving a stabilizer of a work vehicle is disclosed. A joystick is connected to an electronic controller, which in turn, is connected to valve drivers to drive stabilizer raising and lowering valves. In one mode of operation, the controller is programmed to move the stabilizers up or down at a rate that is proportional to the deflection of the joystick from a neutral position. If the operator holds the joystick in a certain position or range of positions, the controller enters a second mode in which it automatically raises the stabilizers even if the joystick is released. The stabilizer can be placed in a third mode of operation by moving the joystick rapidly back and forth. When the operator does this, the controller is configured to reduce the ramp rate or damping of its response to joystick movement.

Claims

1. A system for automatically raising a stabilizer of a work vehicle, comprising

a proportional control operator input device configured to signal both a plurality of upward stabilizer raising rates and a plurality of stabilizer lowering rates;

at least one electronic controller configured to receive a signal indicating a commanded raising rate and a commanded lowering rate from the input device; and

at least one hydraulic valve coupled to the controller to raise and lower the stabilizer in response to rate signals received from the controller;

wherein;

the controller has a first mode of operation in which it signals the at least one valve to raise and lower the stabilizer proportionate to the position of the input device;

the controller has a second mode of operation in which it automatically raises the stabilizer to a predetermined higher up position; and

the controller is configured to change from the first mode of operation to the second mode of operation based upon the operator'"'"'s positioning and holding the input device in a single position of a range of positions for a period of time.

2. The system of claim 1, wherein the controller is configured to exit the second mode of operation when the stabilizer reaches the predetermined higher up position.

3. The system of claim 2, wherein the predetermined higher up position is indicated by a hydraulic pressure spike.

4. The system of claim 3, wherein the controller is configured to monitor a sensor responsive to the hydraulic pressure spike.

5. The system of claim 2, wherein the controller is configured to leave the second mode of operation at least after a predetermined period of time by closing the at least one valve.

6. The system of claim 1, wherein the controller is configured to leave the second mode of operation at least when the operator does not release the input device.

7. A system for automatically raising a stabilizer of a work vehicle, comprising:

an input device configured to generate signals indicating a plurality of stabilizer rates of movement;

an electronic controller configured to receive the signals from the input device and generate corresponding valve signals; and

at least one hydraulic valve coupled to the controller to move the stabilizer in response to the valve signals;

wherein;

the controller has a first mode of operation in which it is configured to signal the at least one hydraulic valve to raise and lower the stabilizer proportionate to the input device position;

the controller has a second mode of operation in which it automatically raises the stabilizer to a predetermined upper position; and

the controller is configured to change from the first mode of operation to the second mode of operation based upon the operator'"'"'s positioning and holding the input device in a single position of a range of positions for a period of time.

8. The system of claim 7, wherein the controller is configured to exit the second mode of operation when the stabilizer reaches the predetermined upper position.

9. The system of claim 8, wherein the controller determines the predetermined upper position by sensing a hydraulic pressure spike.

10. The system of claim 9, wherein the controller is configured to monitor a sensor responsive to the hydraulic pressure spike.

11. The system of claim 8, wherein the controller is configured to leave the second mode of operation at least after a predetermined period of time by closing the at least one valve.

12. The system of claim 7, wherein the controller is configured to leave the second mode of operation at least when the operator does not release the input device.

13. The system of claim 7, further comprising:

a second input device configured to generate second signals indicating a plurality of stabilizer rates of movement for a second stabilizer;

wherein the controller is configured to receive the second signals from the second input device and generate corresponding second valve signals; and

at least a second hydraulic valve coupled to the controller to move the second stabilizer in response to the second valve signals;

wherein the controller is further configured to control the stabilizer and the second stabilizer independently of one another in both the first and second modes of operation.

14. The system of claim 7, wherein the controller is configured to damp stabilizer movement in the first mode of operation, and further wherein the controller is configured to enter a third, less damped, proportional control mode of operation.