Hydraulic shovel and method of controlling hydraulic shovel
First Claim
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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.
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Abstract
A hydraulic shovel includes an engine; a hydraulic pump driven by the engine; an excavating attachment which is driven by high oil discharged from the hydraulic pump; a motor generator that assists a power supply of the engine; and an assist control unit that controls the motor generator to assist the engine in a latter part of the excavating operation by the excavating attachment.
46 Citations
18 Claims
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1. A hydraulic shovel comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A hydraulic shovel comprising:
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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 including an operation status detection unit that detects an operation status of the shovel, and an assist control unit that assists the operation status, the hydraulic shovel being configured to perform an excavating operation, a boom up swiveling operation, a dump operation and a boom down swiveling operation, wherein the operation status detection unit detects a start and an end of at least one of the excavating operation, the boom up swiveling operation, the dump operation and the boom down swiveling operation, and wherein, when the operation status detection unit detects the start of the one operation, the assist control unit starts assisting of the operation status by controlling to increase torque applied to an input shaft of the hydraulic pump by the motor generator to increase a horsepower of the hydraulic pump. - View Dependent Claims (16, 17, 18)
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Specification