HYDRAULIC APPARATUS OF CONSTRUCTION EQUIPMENT AND CONTROL METHOD THEREFOR
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United States of America Patent
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Apr 13, 2015
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Apr 13, 2015
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Abstract
A hydraulic apparatus of construction equipment for increasing a fluid amount supplied to a small chamber of a boom cylinder in a jack-up operation and a control method therefor are provided. The hydraulic apparatus of construction equipment includes: a variable displacement hydraulic pump; a boom cylinder driven by a hydraulic fluid of the hydraulic pump; a boom manipulation lever; a boom control valve controlling a flow direction of the hydraulic fluid supplied to the boom cylinder; a first pressure sensor detecting a pilot pressure applied to the boom control valve; a second pressure sensor detecting a pressure of the hydraulic fluid supplied to the boom cylinder; and a controller increasing a fluid amount supplied to a small chamber of the boom cylinder by a preset amount when a pressure value of the hydraulic fluid supplied to the small chamber is equal to or greater than a preset value.
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