Hydraulic system for construction machinery and method for operating same

Abstract

The present invention relates to a hydraulic system for construction machinery, comprising: a drive device operated by hydraulic pressure; an operation unit for controlling the drive device; a prime mover for generating power; a main pump driven by the prime mover and configured to discharge main hydraulic fluid; a main control valve configured to receive a corrected pilot pressure and control the supply of the main hydraulic fluid to the drive device; a pilot pump driven by the prime mover and configured to discharge pilot hydraulic fluid; and a pilot compensation unit configured to generate, via the pilot hydraulic fluid, the corrected pilot pressure, which is obtained by adding a compensation pilot pressure to an initial pilot pressure corresponding to the operation amount of the operation unit, and to provide the corrected pilot pressure to the main control valve, wherein the pilot compensation unit varies the compensation pilot pressure in correspondence with the rotational speed of the prime mover.

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