US 2015/0284934 A1Published application

Apparatus and method for controlling swing of construction machine

AssigneeVolvo Construction Equipment AB

InventorOk-Jin Suk

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Abstract

Disclosed are an apparatus and method for controlling the swing of a construction machine, which are capable of achieving a preferential boom-up function or a preferential swing function based on a swing angle during the loading work using a complex operation of a boom-up and swing. The method for controlling the swing of a construction machine, comprises: a first step of selecting a preferential boom-up function or a preferential swing function via an external input device; a second step of determining whether to operate a complex operation by an operation signal based on the operation of a boom joystick and a swing joystick; and a third step of variably controlling, if the preferential boom-up function is selected and if it is a complex operation condition, the degree of opening of an electro hydraulic valve for the swing so as to relatively limit the flow that is supplied from a hydraulic pump to a swing motor, and variably controlling, if the preferential swing function is selected and if it is a complex operation condition, the degree of opening of an electro hydraulic valve for the boom so as to relatively limit the flow that is supplied from the hydraulic pump to a boom cylinder.

Claims10

Dependent claims

A swing control method for a construction machine including a hydraulic pump 10, a swing motor 11 and a boom cylinder 12 connected in parallel to the hydraulic pump 10, a swing electro-hydraulic valve 13 installed in a flow path between the hydraulic pump 10 and the swing motor 11, a boom electro-hydraulic valve 14 installed in a flow path between the hydraulic pump 10 and the boom cylinder 12, a swing joystick 15 and a boom joystick 16, and a controller 17, the swing control method comprising:

a first step (S100) of selecting a boom-up priority function or a swing priority function through an external input device;
a second step (S200) of determining whether to perform a combined operation of boom-up and swing based on a manipulation signal applied to the controller 17 in response to a manipulation of the boom joystick 16 and the swing joystick 15;
and
a third step (S300) of relatively limiting the flow rate of hydraulic fluid supplied from the hydraulic pump 10 to the swing motor 11 by variably controlling the amount of opening of the swing electro-hydraulic valve 13 if a boom-up priority function is selected and the combined operation is set to be performed, and relatively limiting the flow rate of hydraulic fluid supplied from the hydraulic pump 10 to the boom cylinder 12 by variably controlling the amount of opening of the boom electro-hydraulic valve 14 if a swing priority function is selected and the combined operation is set to be performed.

1 more element

A swing control apparatus for a construction machine, comprising:

a hydraulic pump 10 connected to an engine;
a swing motor 11 and a boom cylinder 12, which are connected in parallel to the hydraulic pump 10;
a swing electro-hydraulic valve 13 which is installed in a flow path between the hydraulic pump 10 and the swing motor 11 and of which the amount of opening is variably controlled by a control signal applied thereto from an outside;
a boom electro-hydraulic valve 14 which is installed in a flow path between the hydraulic pump 10 and the boom cylinder 12 and of which the amount of opening is variably controlled by a control signal applied thereto from the outside;
a swing joystick 15 configured to output a manipulation signal for controlling the swing motor 11;
a boom joystick 16 configured to output a manipulation signal for controlling the boom cylinder 12;
an external input device configured to select a boom-up priority function or a swing priority function;
and
a controller 17 configured to relatively limit the flow rate of hydraulic fluid supplied from the hydraulic pump 10 to the swing motor 11 by variably controlling the amount of opening of the swing electro-hydraulic valve 13 if the boom-up priority function is selected by a manipulation of the external input device and a combined operation of boom-up and swing is set to be performed by the manipulations of the swing joystick 15 and the boom joystick 16, and relatively limit the flow rate of hydraulic fluid supplied from the hydraulic pump 10 to the boom cylinder 12 by variably controlling the amount of opening of the boom electro-hydraulic valve 14 if the swing priority function is selected by a manipulation of the external input device and the combined operation is set to be performed by the manipulations of the swing joystick 15 and the boom joystick 16.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/440,015Filed 5 Nov 2012
Published: 8 Oct 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

E02F 9/2228
Using pressure-compensating valves: including an electronic controller
E02F 9/123
Turntables, i.e. structure rotatable about 360°: drives or control devices specially adapted therefor
E02F 9/2037
Particular purposes of control systems not otherwise provided for: coordinating the movements of the implement and of the frame
E02F 9/205
Particular purposes of control systems not otherwise provided for: remotely operated machines, e.g. unmanned vehicles