Method and apparatus for providing detents on an electronic control handle

• US 5,642,653 A
• Filed: 10/23/1995
• Issued: 07/01/1997
• Est. Priority Date: 10/23/1995
• Status: Expired due to Term

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Hutchison, Eric A.
• Primary Examiner(s): LOPEZ, FRANK D
• Application Number:
  US08/547,049
• Time in Patent Office: 617 Days
• Field of Search: 91/361, 91/459, 60/393
• US Class Current: 91/459
• CPC Class Codes: E02F 9/2025 Particular purposes of control systems not otherwise provided for E02F3/16, E02F3/26, sub-groups of E02F3/43, E02F3/651, sub-groups of E02F3/84, E02F3/907, E02F5/145 take precedence
• CPC Class Codes: F15B 13/14 Special measures for giving the operating person a "feeling" of the response of the actuated device

Abstract

An apparatus and method for providing a detent function on a hydraulic system. The hydraulic system includes a hydraulic implement movable between first and second implement positions. The apparatus and method receives a control input signal generated by an electronic control handle in response to operator input, monitors the control input signal, and actives a detent function if the control input signal follows a preset pattern. The preset pattern includes moving the handle to a detent area, between first and second positions, and then back to neutral, within a given time period. There is also a force feedback to the handle, opposing operator movement; which is proportional to the distance moved from neutral, and which has different attributes within and outside the detect area.

Claims

1. An apparatus for providing a detent function on a hydraulic system, the hydraulic system including a hydraulic implement movable between first and second implement positions, comprising:

control input means, operable by an operator between first and second control positions, for producing a control input signal indicative of desired movement of the hydraulic implement between the first and second implement positions;

electronic control means, coupled to said control input means, for receiving said control input signal and responsively producing a valve actuation signal;

hydraulic control means, coupled between said electronic control means and the hydraulic implement, for receiving the valve actuation signal and responsively providing hydraulic fluid flow to the hydraulic implement;

wherein said electronic control means includes;

means for monitoring said control input signal and responsively producing an active detent signal if said control input signal follows a preset pattern; and

means for receiving said active detent signal and automatically providing a detent function by actuating said hydraulic control means at full displacement in response to receiving said active detent signal.

2. An apparatus, as set forth in claim 1, wherein said preset pattern is followed if said control input signal is equal to a first preset value and subsequently equal to a second preset value within a predetermined time period.

3. An apparatus, as set forth in claim 1, wherein said control input means includes an electronic control handle movable from a NEUTRAL position to a first control position and from said first control position to a second control position, the area from said first control position to said second control position defining a detent request area.

4. An apparatus, as set forth in claim 3, wherein said preset pattern is defined as movement by said operator of said electronic control handle from said NEUTRAL position to said detent request area and subsequent release of said electronic control handle back to said NEUTRAL position.

5. An apparatus, as set forth in claim 4, wherein said electronic control means includes means for terminating said detent function if one of the following occur:

the hydraulic implement reaches a pre-set position, and

said operator moves said electronic control handle.

6. An apparatus, as set forth in claim 4, including force feedback means for providing feedback to said operator through said control input means, said feedback to said operator is defined as a force applied to said electronic control handle in a direction opposite to movement of said electronic control handle by said operator, said force being proportional to the distance of the electronic control handle from a NEUTRAL position.

7. An apparatus, as set forth in claim 6, wherein the force applied to the electronic control lever between said NEUTRAL position and said first control position is linear with a first preset slope and the force applied to the electronic control lever between said first control position and said second control position being linear with a second preset slope.

8. An apparatus, as set forth in claim 7, wherein said force applied to said electronic handle (108) between said first and second control positions being greater than the force applied between said NEUTRAL position and first control position.

9. An apparatus, as set forth in claim 8, wherein said second preset slope is greater than said first preset slope.

10. An apparatus, as set forth in claim 1, including force feedback means for providing feedback to said operator through said control input means.

11. An apparatus, as set forth in claim 10, wherein said control input means includes an electronic control handle and said feedback to said operator is defined as a force applied to said electronic control handle in a direction opposite to movement of said electronic control handle by said operator.

12. An apparatus, as set forth in claim 11, wherein said force is proportional to the distance of the electronic control handle from a NEUTRAL position.

13. An apparatus for providing a detent function on a hydraulic system, the hydraulic system including a hydraulic implement movable between first and second implement positions, comprising:

an electronic control handle, operable by an operator between first and second control positions, for producing a control input signal indicative of desired movement of the hydraulic implement between the first and second implement positions;

electronic control means, coupled to said electronic control handle, for receiving said control input signal and responsively producing a valve actuation signal;

hydraulic control means, coupled between said electronic control means and the hydraulic implement, for receiving the valve actuation signal and responsively providing hydraulic fluid flow to the hydraulic implement;

wherein said electronic control means including means for monitoring said control input signal and responsively providing a detent function if said operator moves said electronic control handle into a detent request area and releases said electronic control handle within a predetermined time period.

14. An apparatus, as set forth in claim 13, wherein said means for providing a detent function includes means for actuating said hydraulic control means at full displacement until one of the following occur:

the hydraulic implement reaches a detent position, and

said operator moves said electronic control handle.

15. An apparatus for providing a detent function on a hydraulic system, the hydraulic system including a hydraulic implement movable between first and second implement positions, comprising:

an electronic control handle, operable by an operator between first and second control positions, for producing a control input signal indicative of desired movement of the hydraulic implement between the first and second implement positions;

electronic control means, coupled to said control input means, for receiving said control input signal, providing a detent function, and responsively producing a valve actuation signal;

hydraulic control means, coupled between said electronic control means and the hydraulic implement, for receiving the valve actuation signal and responsively providing hydraulic fluid flow to the hydraulic implement; and

,

force feedback means for providing feedback to said operator through said control input means, said feedback to said operator is defined as a force applied to said electronic control handle in a direction opposite to movement of said electronic control handle by said operator, said force being proportional to the distance of the electronic control handle from a NEUTRAL position;

wherein the force applied to the electronic control lever between said NEUTRAL position and said first control position is linear with a first preset slope and the force applied to the electronic control lever between said first control position and said second control position being linear with a second preset slope;

wherein said force applied to said electronic handle between said first and second control positions being greater than the force applied between said NEUTRAL position and first control position; and

, wherein said second preset slope is greater than said first preset slope.

16. A method for providing a detent function on a hydraulic system, the hydraulic system including a hydraulic implement movable between first and second positions, including:

receiving a control input signal generated by a control handle in response to operator input;

monitoring said control input signal;

activating a detent function if said control input signal follows a preset pattern; and

,

wherein said preset pattern is followed if said input control signal is equal to a first predetermined value and subsequently equal to a second predetermined value within a predetermined period of time.