US 12,577,756 B2Granted

Control method for executing a floating function of a boom, corresponding control systems and work vehicles comprising such control systems

AssigneeCNH Industrial Italia S.p.A.

InventorsAdriano Garramone, Andrea Gravili, Stefano Liberti, Antonio Venezia

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Abstract

A control method for executing a floating function of a boom in a work vehicle includes determining that a predetermined floating function activation command has been inputted by the operator by means of a command input means. When the floating function activation command has been inputted by the operator, acquiring, a signal or data indicative of the current position of the boom along a travel path of the boom over time, the travel path including a first section between a boom full extension position and a deceleration position, a second section between the deceleration position and a grounding position, and a third section between the grounding position and a full retract position, and moving the boom from the current position, determined based on the signal or data indicative of the position of the boom, to the full retract position.

Claims18

Dependent claims

A control method for executing a floating function of a boom in a work vehicle powered by a motor, wherein the actuation of the boom occurs by means of hydraulic actuating means including at least one hydraulic cylinder operatively connected the boom, and a directional solenoid valve whose opening degree is adapted to control the flow of a working fluid to the at least one hydraulic cylinder, and a rate of actuation of the boom is controlled by the opening degree of the directional solenoid valve by means of a driving current thereof, the control method comprising:

determining that a predetermined floating function activation command has been inputted by an operator by means of a command input means;
and
when it is determined that the floating function activation command has been inputted by the operator:
acquiring a signal or data indicative of the current position of the boom along a travel path of the boom over time, wherein the travel path include a first section between a boom full extension position and a deceleration position, a second section between the deceleration position and a grounding position, and a third section between the grounding position and a full retract position;
and
moving the boom from the current position, determined based on the signal or data indicative of the position of the boom, to the full retract position, wherein:
when the boom is in the first section, moving the boom according to a first rate of actuation of the boom by means of a first value of driving current,
when the boom is in the second section, moving the boom according to a second rate of actuation of the boom, lower than said first rate of actuation of the boom, by means of a second value of driving current, and
when the boom is in the third section, moving the boom according to the force of gravity, with a null-rate of actuation of the boom by means of a third value of driving current.

6 more elements

A control system for a work vehicle, comprising:

first input means for receiving at least a signal or data indicative of the position of a boom along a travel path of the boom;
second input means for receiving a predetermined floating function activation command inputted by an operator by means of a command input means;
and
first output means for issuing at least a signal indicative of driving current intended to control an opening degree of a directional solenoid valve of hydraulic actuating means of said boom;
the control system being configured to carry out a control method comprising:
determining that a predetermined floating function activation command has been inputted by the operator by means of a command input means;
and
when it is determined that the floating function activation command has been inputted by the operator:
acquiring a signal or data indicative of the current position of the boom along a travel path of the boom over time, wherein the travel path include a first section between a boom full extension position and a deceleration position, a second section between the deceleration position and a grounding position, and a third section between the grounding position and a full retract position;
and
moving the boom from the current position, determined based on the signal or data indicative of the position of the boom, to the full retract position, wherein:
when the boom is in the first section, moving the boom according to a first rate of actuation of the boom by means of a first value of driving current,
when the boom is in the second section, moving the boom according to a second rate of actuation of the boom, lower than said first rate of actuation of the boom, by means of a second value of driving current, and
when the boom is in the third section, moving the boom according to the force of gravity, with a null-rate of actuation of the boom by means of a third value of driving current.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/245,709Filed 16 Sep 2021
Priority: IT 10202000002180816 Sep 2020
Published: US 2023/0358021 A19 Nov 2023
Granted: 17 Mar 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification27 codes

E02F 9/2203
Hydraulic or pneumatic drives: arrangements for controlling the attitude of actuators, e.g. speed, floating function
E02F 3/431
Control of dipper or bucket position; Control of sequence of drive operations: for bucket-arms, front-end loaders, dumpers or the like
E02F 9/265
Sensors and their calibration for indicating the position of the work tool: with follow-up actions
F15B 13/044
For use with a single servomotor: operated by electrically-controlled means, e.g. solenoids, torque-motors