WO1999027197A3 - Electronic control for a two-axis work implement - Google Patents

Electronic control for a two-axis work implement Download PDF

Info

Publication number
WO1999027197A3
WO1999027197A3 PCT/US1998/025260 US9825260W WO9927197A3 WO 1999027197 A3 WO1999027197 A3 WO 1999027197A3 US 9825260 W US9825260 W US 9825260W WO 9927197 A3 WO9927197 A3 WO 9927197A3
Authority
WO
WIPO (PCT)
Prior art keywords
loader
bucket
joystick
controller
motion
Prior art date
Application number
PCT/US1998/025260
Other languages
French (fr)
Other versions
WO1999027197A2 (en
WO1999027197A8 (en
Inventor
Alan D Berger
Ketan B Patel
Peter J Dix
Danley C Chan
James M Grupka
Original Assignee
Case Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/978,669 external-priority patent/US6115660A/en
Application filed by Case Corp filed Critical Case Corp
Publication of WO1999027197A2 publication Critical patent/WO1999027197A2/en
Publication of WO1999027197A8 publication Critical patent/WO1999027197A8/en
Publication of WO1999027197A3 publication Critical patent/WO1999027197A3/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
    • E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
    • E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
    • E02F3/433—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude horizontal, e.g. self-levelling
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements

Abstract

A loader (40) of the type controlled with an electronic digital controller (60) is disclosed herein. The loader may include conventional mechanical components. However, the hydraulic valve (54) is electronically controlled to provide improved motion control. In particular, the operator controls the loader with a two-axis joystick (64). When the joystick is moved left or right, the bucket (24) is rolled at a speed proportional to the rate of change of the joystick position and independent of the loader arms. When the joystick is moved forward or backwards, the loader arms (20) of the bucket are raised or lowered. When the joystick is only moved forward or backward with substantially no component of motion left or right, the controller rolls the bucket to maintain a substantially constant angle between the bucket (24) and the loader's frame (12). This constant attitude control decreases the operator workload and increases control accuracy. The controller provides velocity-based control over the loader arm and bucket motion, or flow-based control for improved stability and accuracy. The controller can monitor available flow and can then limit the commanded flows to the actuators to avoid exceeding the available flow.
PCT/US1998/025260 1997-11-26 1998-11-25 Electronic control for a two-axis work implement WO1999027197A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US08/978,669 US6115660A (en) 1997-11-26 1997-11-26 Electronic coordinated control for a two-axis work implement
US08/978,669 1997-11-26
US09/196,675 1998-11-20
US09/196,675 US6233511B1 (en) 1997-11-26 1998-11-20 Electronic control for a two-axis work implement

Publications (3)

Publication Number Publication Date
WO1999027197A2 WO1999027197A2 (en) 1999-06-03
WO1999027197A8 WO1999027197A8 (en) 1999-11-04
WO1999027197A3 true WO1999027197A3 (en) 2003-05-08

Family

ID=26892117

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/025260 WO1999027197A2 (en) 1997-11-26 1998-11-25 Electronic control for a two-axis work implement

Country Status (2)

Country Link
US (1) US6233511B1 (en)
WO (1) WO1999027197A2 (en)

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