Filing Information

Inventor(s)	Bo Vigholm · Nils-Erik Bånkestad · Rauno Räisanen ·
Assignee(s)	Volvo Contruction Equipment AB ·  View assignee updates
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	US20070039457 - 02/22/2007
Predicted expiration date	03/29/2025
U.S. Classifications	604/45  · 700/75  ·
International Classifications	E02F922  · G05B1500  ·
Kind Code	B2
Related U.S. Application Data	CROSS-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 ·

Patent Family

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.