CONTROL SYSTEM FOR CONSTRUCTION MACHINERY AND CONTROL METHOD FOR CONSTRUCTION MACHINERY USING THE SAME

摘要

A control system for construction machinery includes first and second hydraulic pumps connected to an engine, a swing control valve and a first boom control valve installed in a first center bypass line connected to the first hydraulic pump, a second boom control valve installed in a second center bypass line connected to the second hydraulic pump, a shutoff valve installed in a control line through which a boom raising pilot signal pressure is supplied to the first boom control valve and configured to selectively open and close the control line, and a control unit configured to electronically control the shutoff valve according to a manipulation signal, wherein the control unit closes the shutoff valve such that the first boom control valve is shifted to a neutral position when a swing operation priority mode is selected.

主权项

1. A control system for construction machinery, comprising:
first and second hydraulic pumps connected to an engine; a swing control valve and a first boom control valve installed in a first center bypass line connected to the first hydraulic pump and connected parallel with each other to the first hydraulic pump by a parallel line, the swing control valve configured to control a drive of a swing motor, the first boom control valve configured to control a drive of a boom cylinder; a second boom control valve installed in a second center bypass line connected to the second hydraulic pump, the second boom control valve configured to control the drive of the boom cylinder; a shutoff valve installed in a control line through which a boom raising pilot signal pressure for raising a boom of the boom cylinder is supplied to the first boom control valve and configured to selectively open and close the control line; and a control unit configured to electronically control the shutoff valve according to a manipulation signal in the construction machinery, wherein the control unit closes the shutoff valve such that the first boom control valve is shifted to a neutral position when a swing operation priority mode is selected.