Shovel
First Claim
1. A shovel comprising:
- a lower travelling body;
an upper swivel body;
an operation attachment;
an engine;
a motor generator which is connected to the engine;
a hydraulic pump which is connected to the motor generator and supplies hydraulic oil to the operation attachment;
a swiveling electric motor which is mounted on the upper swivel body;
a power storage device;
a DC bus which electrically connects the power storage device and the swiveling electric motor to each other; and
a control device,wherein the control device decreases a charging/discharging limit value of the power storage device and changes a discharging requirement value which is the maximum value of power which is supplied from the power storage device to the swiveling electric motor, according to a decrease of temperature.
1 Assignment
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Accused Products
Abstract
A shovel according to embodiments of the present invention includes a lower travelling body, an upper swivel body, an operation attachment, an engine, a motor generator which is connected to the engine, a hydraulic pump which is connected to the motor generator and supplies hydraulic oil to the operation attachment, a swiveling electric motor which is mounted on the upper swivel body, a power storage device, a DC bus which electrically connects the power storage device and the swiveling electric motor to each other, and a control device, in which the control device decreases a charging/discharging limit value of the power storage device and changes a discharging requirement value which is the maximum value of power which is supplied from the power storage device to the swiveling electric motor, according to a decrease of temperature.
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Citations
14 Claims
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1. A shovel comprising:
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a lower travelling body; an upper swivel body; an operation attachment; an engine; a motor generator which is connected to the engine; a hydraulic pump which is connected to the motor generator and supplies hydraulic oil to the operation attachment; a swiveling electric motor which is mounted on the upper swivel body; a power storage device; a DC bus which electrically connects the power storage device and the swiveling electric motor to each other; and a control device, wherein the control device decreases a charging/discharging limit value of the power storage device and changes a discharging requirement value which is the maximum value of power which is supplied from the power storage device to the swiveling electric motor, according to a decrease of temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification