HYDRAULIC DRIVE SYSTEM OF CONSTRUCTION EQUIPMENT

摘要

A pump control apparatus according to the present invention outputs, as a command rotation number to an engine control apparatus, a standby rotation number smaller than a selected reference rotation number when an operation apparatus is not receiving a first operation and a second operation, changes the command rotation number such that a rate of increase of the rotation number gradually becomes smaller as the first operation becomes larger from the standby rotation number to a first target rotation number when the operation apparatus has received the first operation, changes the command rotation number such that the rate of increase of the rotation number gradually becomes larger as the second operation becomes larger from the standby rotation number to a second target rotation number when the operation apparatus has received the second operation, and supplies a command current to an electromagnetic proportional valve that outputs a secondary pressure to a regulator that adjusts a tilt angle of a pump such that the sizes of the first operation and the second operation and a discharge flow amount of the pump achieve a proportional relationship.