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US7571604: Method for shaking a work implement

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Filing Information

Inventor(s) Bo Vigholm · Nils-Erik Bånkestad · Rauno Räisanen ·
Assignee(s) Volvo Contruction Equipment AB ·
Attorney/Agent(s) Novak Druce + Quigg LLP ·
Primary Examiner Thomas E Lazo ·
Application Number US11550988
Filing date 10/19/2006
Issue date 08/11/2009
Prior Publication Data
Predicted expiration date 03/29/2025
U.S. Classifications 604/45  · 700/75  ·
International Classifications E02F922  · G05B1500  ·
Kind CodeB2
Related U.S. Application DataCROSS-REFERENCE TO RELATED APPLICATIONS
The present application is a continuation patent application of International Application No. PCT/SE2005/000466 filed 29 Mar. 2005 which is published in English pursuant to Article 21(2) of the Patent Cooperation Treaty and which claims priority to Swedish Application No. 0401029-4 filed 19 Apr. 2004. Said applications are expressly incorporated herein by reference in their entireties.
Foreign Priority SE0401029 - 04/19/2004 ·
19 Claims, 3 Drawings


Abstract

A method and arrangement for controlling a function of a work implement utilizing a device including a source of pressurized fluid (1), a circuit of pressurized fluid (2) for driving the work implement, an electronically controlled hydraulic valve (5) being arranged in the circuit of pressurized fluid (2) for controlling the function of the work implement, a control unit (4) for controlling the hydraulic valve (5) based upon a signal from a control member (3) for transmitting a control command to the control unit (4), wherein the control unit (4) is arranged for controlling the hydraulic valve (5) in accordance with a smooth mode function or an abrupt mode function. The opening time for opening the hydraulic valve (5) to a predetermined opening degree is changed when switching from one operating mode function to the other operating mode function.

Independent Claims | See all claims (19)

  1. 1. A working machine comprising: a source of pressurized fluid (1); a circuit of pressurized fluid (2) for driving the work implement; an electronically controlled hydraulic valve (5) arranged in the circuit of pressurized fluid (2) for controlling the function of the work implement; and a computer-based control unit (4), with machine-executable program statements thereon, that controls the hydraulic valve (5) based upon a signal from a control member (3) for transmitting a control command to the control unit (4), wherein the control unit (4) alternately controls the hydraulic valve (5), using a filter function to do so, in accordance with a smooth mode function or an abrupt mode function and wherein the filter function operates differently in the smooth mode and in the abrupt mode so that the opening time for opening the hydraulic valve (5) to a predetermined opening degree is changed when switching from one operating mode function to the other operating mode function, the ramp time for the hydraulic valve (5) to open to said predetermined degree being shorter in the abrupt mode than in the smooth mode.
  2. 10. A method for controlling a function of a work implement by means of a device including a source of pressurized fluid (1), a circuit of pressurized fluid (2) for driving the work implement, an electronically controlled hydraulic valve (5) arranged in the circuit of pressurized fluid (2) for controlling the function of the work implement, and a control unit (4), said method comprising: controlling the hydraulic valve (5) based upon a signal from a control member (3) for transmitting a control command to the control unit (4), said control unit (4) alternately controlling the hydraulic valve (5), using a filter function to do so, in accordance with a smooth mode function or an abrupt mode function wherein the filter function operates differently in the smooth mode and in the abrupt mode so that the opening time for opening the hydraulic valve (5) to a predetermined opening degree is changed when switching from one operating mode function to the other operating mode function, the ramp time for the hydraulic valve (5) to open to said predetermined degree being shorter in the abrupt mode than in the smooth mode.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US5235809* Incorporated Vickers Farrell Aug 1993
US5765594 Danfoss A/S Collins et al. Jun 1998
US5880957 Caterpillar Inc. Aardema et al. Mar 1999
US6029445 Case Corporation Lech Feb 2000
US6047228 Caterpillar Inc. Stone et al. Apr 2000
US6757992* New Holland North America, Inc. Berger et al. Jul 2004
US6763661* Husco International, Inc. Tabor et al. Jul 2004
US6895319* Deere & Company Alexander et al. May 2005
US20020065575* Francis et al. May 2002
* cited by examiner

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