Patent ID: 9518370
Filing Date: 2016-12-13
CPC Classification: E02F

Claim Text:
1. A shovel comprising: an excavation operation detection part configured to detect a complex excavation operation of the shovel, the complex excavation operation including a boom raising operation, and an arm closing operation or a bucket closing operation; a position detection part configured to detect a position of the shovel; a maximum allowable pressure calculation part configured to calculate, during the detected complex excavation operation, a maximum allowable pressure of a contraction-side oil chamber of a boom cylinder based on the position of the shovel detected during the detected complex excavation operation, the maximum allowable pressure being a pressure of the contraction-side oil chamber of the boom cylinder corresponding to an excavation reaction force at a time when the shovel is lifted by the excavation reaction force; and a boom cylinder pressure control part configured to control the pressure of the contraction-side oil chamber of the boom cylinder not to exceed the maximum allowable pressure during the detected complex excavation operation.