DIFFERENTIAL CONFIGURATION OF REMOTE HYDRAULIC VALVE FLOW RATES FOR EXTEND AND RETRACT MODES OF OPERATION

• US 20020157712A1
• Filed: 04/30/2001
• Published: 10/31/2002
• Est. Priority Date: 04/30/2001
• Status: Active Grant

• Current Assignee: Blue Leaf IP Incorporated (CNH Industrial N.V.), CNH Industrial America LLC (CNH Industrial N.V.)
• Original Assignee: Case Corporation (CNH Industrial N.V.)
• Inventors: Halgrimson, Curtis A., Hou, Yanming
• Granted Patent: US 6,561,076 B2
• Time in Patent Office: Days
• US Class Current: 137/554
• CPC Class Codes: A01B 63/00 Lifting or adjusting devices or arrangements for agricultural machines or implements lifting mechanisms for the cutter-bar of a mower A01D34/24; adjusting devices for the cutter-bar of a mower A01D34/28; constructional features of lifting devices per se B66F
• CPC Class Codes: A01B 71/06 Special adaptations of coupling means between power take-off and transmission shaft to the implement or machine couplings for transmitting rotation F16D
• CPC Class Codes: F15B 11/165 for adjusting the pump output or bypass in response to demand
• CPC Class Codes: F15B 21/082 with different modes
• CPC Class Codes: F15B 21/087 Control strategy, e.g. with block diagram
• CPC Class Codes: F15B 2211/20553 with pilot circuit, e.g. for controlling a swash plate
• CPC Class Codes: F15B 2211/30525 Directional control valves, e.g. 4/3-directional control valve
• CPC Class Codes: F15B 2211/3111 the pump port being closed in the centre position, e.g. so-called closed centre
• CPC Class Codes: F15B 2211/3144 the positions being continuously variable, e.g. as realised by proportional valves
• CPC Class Codes: F15B 2211/327 electrically or electronically
• CPC Class Codes: F15B 2211/6054 using shuttle valves
• CPC Class Codes: F15B 2211/6313 the pressure being a load pressure
• CPC Class Codes: F15B 2211/6346 representing a state of input means, e.g. joystick position
• CPC Class Codes: F15B 2211/6355 having valve means
• CPC Class Codes: F15B 2211/6654 Flow rate control
• CPC Class Codes: F15B 2211/7053 Double-acting output members
• CPC Class Codes: F15B 2211/71 Multiple output members, e.g. multiple hydraulic motors or cylinders
• CPC Class Codes: F15B 2211/855 Testing of fluid pressure systems
• CPC Class Codes: F15B 2211/8636 Circuit failure, e.g. valve or hose failure
• CPC Class Codes: F15B 2211/87 Detection of failures
• CPC Class Codes: Y10T 137/8242 : Electrical

Abstract

A method of individually adjusting auxiliary hydraulic valves for work vehicles is provided such that they provide different maximum flow rates for opposite flow directions through the valve. The valve is controlled by a flow rate control for setting a maximum flow rate and is also controlled by a proportional control input device having one range of positions for providing a corresponding first range of flow rates in the one direction, a central position for providing substantially no flow, and another range of positions for providing a corresponding second range of flow rates in the other direction. The method of adjusting the valves includes the steps of electronically selecting a first auxiliary valve from a plurality of available auxiliary valves, electronically selecting a first direction of operation of the first auxiliary valve, electronically selecting a desired first offset signal for the first direction of operation of the first auxiliary valve, and saving the first offset signal in association with an identifier of the first valve and the first direction in an electronic memory.

Claims

1. A method of individually configuring an auxiliary hydraulic valve for a work vehicle such that it provides different maximum flow rates for hydraulic fluid flows in opposite directions through the valve, wherein the valve is controlled by a flow rate control for setting a maximum flow rate in both the opposite directions, and is also controlled by a proportional control device having one range of positions for providing a corresponding first range of flow rates in one direction, a central position for providing substantially no flow, and another range of positions for providing a corresponding second range of flow rates in another direction opposite the one direction, the method comprising the steps of:

electronically selecting a first auxiliary valve from a plurality of available auxiliary valves;

electronically selecting a first direction of operation of the first auxiliary valve;

electronically selecting a desired first offset signal for the first direction of operation of the first auxiliary valve; and

saving the first offset signal in association with an identifier of the first valve and the first direction in an electronic memory.

2. The method of claim 1, further comprising the steps of:

electronically selecting a second direction of operation opposite the first direction of operation of the first auxiliary valve;

electronically selecting a desired second offset signal different from the first offset signal for the second direction of the first auxiliary valve; and

saving the second offset signal in association with an identifier of the first valve and the second direction in an electronic memory.

3. The method of claim 1 further comprising the steps of:

electronically selecting a second auxiliary valve from the plurality of available auxiliary valves;

electronically selecting a third direction of operation of the second auxiliary valve;

electronically selecting a desired third offset signal for the third direction of operation of the second auxiliary valve; and

saving the third offset signal in association with an identifier of the second valve and the third direction in an electronic memory.

4. The method of claim 1, further comprising the steps of:

retrieving a position of a proportional control input device;

retrieving a position of a flow rate control device;

determining the first direction from the position of the proportional control input device;

combining a value indicative of the position of the proportional control input device, a value indicative of the position of the flow rate control device, and the first offset in a microprocessor to produce a combined value;

generating a valve signal from the combined value; and

applying the valve signal to the first auxiliary hydraulics valve.

5. The method of claim 2, further comprising the steps of:

retrieving a first position of a proportional control input device;

retrieving a first position of a flow rate control device;

determining the first direction from the first position of the proportional control input device;

combining a first value indicative of the first position of the proportional control input device, a first value indicative of the first position of the flow rate control device, and the first offset in a microprocessor to produce a first combined value;

generating a first valve signal from the first combined value;

applying the first valve signal to the first auxiliary hydraulics valve;

retrieving a second position of a proportional control input device different from the first position of the proportional control input device;

retrieving a second position of a flow rate control device;

determining the second direction from the second position of the proportional control input device that is opposite the first direction of the proportional control input device;

combining a second value indicative of the second position of the proportional control input device, a second value indicative of the second position of the flow rate control device, and the second offset in a microprocessor to produce a second combined value;

generating a second valve signal from the second combined value; and

applying the second valve signal to the first auxiliary hydraulics valve.

6. The method of claim 1 wherein the step of electronically selecting a first auxiliary valve includes the steps of:

providing a plurality of visual indicia each representative of the plurality of available auxiliary valves on an electronic display; and

selecting one of the plurality of valves from the plurality of visual indicia.

7. The method of claim 6 wherein the step of selecting one of the plurality of valves includes the step of pressing a switch associated with the one of the plurality of visual indicia.

8. The method of claim 7, wherein the electronic display is a touch screen and the step of pressing a switch includes the step of pressing a location on the touch screen visually associated with the one of the visual indicia.

9. The method of claim 1, wherein the step of electronically selecting a first direction of operation of the first auxiliary valve includes to steps of:

providing visual indicia representative of at least one direction of operation on an electronic display; and

selecting at least one visual indicia indicative of one of the at least one direction of travel from the visual indicia.

10. The method of claim 9, wherein the step of selecting at least one visual indicia includes the step of pressing a switch associated with the at least one visual indicia.

11. The method of claim 10, wherein the electronic display is a touch screen, and further wherein the step of pressing a switch includes the step of pressing a location on the touch screen visually associated with the at least one visual indicia.

13. The apparatus of claim 12 wherein the controller is configured to save a second selected valve offset that is different from the first selected valve offset in association with a second selected direction of flow that is different from the first selected direction of flow.

14. The apparatus of claim 13, wherein the operator input device includes a plurality of switches associated with the electronic display.

15. The apparatus of claim 14, wherein the electronic display is a touch screen display and further wherein the plurality of switches includes a touch screen switch matrix.

12. An apparatus for selecting and applying separate auxiliary hydraulic valve flow rate offsets from a plurality of offsets for an auxiliary hydraulic valve comprising:

a first proportional control input device associated with the auxiliary hydraulics valve;

a flow rate control input device associated with the auxiliary hydraulics valve;

a microprocessor-based controller coupled to the proportional control input device and the flow rate control input device and configured to periodically scan both the proportional control input device and the flow rate control input device to determine their respective positions;

an electronic display coupled to and driven by the microprocessor-based controller and configured to display indicia indicative of (1) the auxiliary hydraulic valve, (2) two opposing directions of flow through the auxiliary hydraulic valve, and (3) a plurality of valve offsets; and

an operator input device coupled to the controller and configured to respond to operator manipulations indicative of (1) manual selection of the auxiliary hydraulic valve, (2) manual selection of each of the two opposing directions of flow, and (3) manual selection of a desired valve offset of the plurality of valve offsets, and further wherein the controller is configured to monitor the operator input device and, in response to manipulation of the operator input device, to save a first selected valve offset in association with a first selected direction of flow.