Patent ID: 9593466
Date: 2017-03-14
CPC Classifications: E02F

Claim:
1. A hydraulic shovel comprising: a traveling lower body; a slewing upper body that is mounted on the traveling lower body as being capable of being slewed; an engine; a hydraulic pump driven by the engine; an excavating attachment including a boom provided at the slewing upper body, an arm rotatably provided at a front end of the boom and a bucket rotatably provided at a front end of the arm; a boom cylinder that drives the boom by being provided with high pressure oil of the hydraulic pump; an arm cylinder that drives the arm by being provided with high pressure oil of the hydraulic pump; a bucket cylinder that drives the bucket by being provided with high pressure oil of the hydraulic pump; a motor generator connected to the hydraulic pump; and a controller, wherein, upon detecting a closing operation in which the arm is moved close to the slewing upper body, the controller controls to increase torque applied to an input shaft of the hydraulic pump by the motor generator to increase a horsepower of the hydraulic pump.