Patent ID: 9016312
Filing Date: 2015-04-28
Classification: E02F,F04B,Y10T

Abstract:
1. An apparatus for controlling the flow of a hydraulic pump of a construction machine, comprising: a pressure sensor configured to detect pressure signals corresponding to various control signal input values of the construction machine; a shuttle block coupled to the pressure sensor and having a plurality of shuttle valves configured to extract pressure oil from a hydraulic line having the highest pressure among hydraulic lines connected with the pressure sensor, which are divided into groups, within the respective group, and to discharge the pressure oil from the hydraulic line having the highest pressure; an auxiliary pressure sensor coupled to the shuttle block and configured to detect the pressure of the pressure oil discharged from the shuttle block; an electro proportional control valve configured to control flows to a signal line with an opening rate being adjusted according to a signal supplied thereto, to adjust discharge flow of a main pump; and a controller coupled to the auxiliary pressure sensor such that the shuttle block and auxiliary pressure sensor are operably coupled between the sensor and the controller, the controller configured to control the electro proportional control valve such that the opening rate of the electro proportional control valve is adjusted according to the magnitude of the pressure signal supplied from the pressure sensor; wherein the controller is further configured to determine whether the pressure sensor is abnormal, and when the pressure sensor is determined to be abnormal, the controller controls the opening rate of the electro proportional control valve to an opening rate corresponding to the magnitude of a signal outputted from the auxiliary pressure sensor.