Hybrid excavator and method of controlling hybrid excavator
First Claim
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1. A hybrid excavator comprising:
- a lower running body;
an upper turning body that is positioned on the lower running body;
a boom including one end that is rotatably attached to the upper turning body;
an engine that is positioned at the upper turning body;
a motor generator that is positioned at the upper turning body and is configured to perform an assist operation for the engine and an electric power generating operation using the engine;
a motor generator control part that is configured to control the motor generator in response to a switching control signal supplied from a control unit;
a first electrical energy storage device that is positioned at the upper turning body;
a second electrical energy storage device that is positioned at the upper turning body and is electrically connected to the motor generator control part;
a charge/discharge control part that is positioned at the upper turning body and is configured to control a charge/discharge operation between the first electrical energy storage device and the second electrical energy storage device in response to an externally supplied control command signal;
a motor that is positioned at the upper turning body and is electrically connected to the second electrical energy storage device, the motor being configured to perform a regeneration operation for generating electric energy from mechanical energy and store the electric energy generated by the regeneration operation in the second electrical energy storage device; and
the control unit that is configured to supply a control signal to at least one of the motor generator control part and the charge/discharge control part;
wherein the control unit is configured to set a second electrical energy storage target value for the second electrical energy storage device to a higher value than a first electrical energy storage target value for the first electrical energy storage device during the regeneration operation performed by the motor, andwherein, during a period in which the motor performs a power running operation, the control unit sets the second electrical energy storage target value for the second electrical energy storage device to a higher value than a previous electrical energy storage target value for the second electrical energy storage device that is set up before the motor performs the power running operation.
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Abstract
A hybrid excavator includes a control unit that is arranged at an upper turning body and is configured to supply a drive signal to at least one of a motor generator control part and a charge/discharge control part. During a regeneration operation performed by a motor, the control unit sets an electrical energy storage target value for a second electrical energy storage device to a higher value than an electrical energy storage target value for a first electrical energy storage.
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Citations
12 Claims
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1. A hybrid excavator comprising:
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a lower running body; an upper turning body that is positioned on the lower running body; a boom including one end that is rotatably attached to the upper turning body; an engine that is positioned at the upper turning body; a motor generator that is positioned at the upper turning body and is configured to perform an assist operation for the engine and an electric power generating operation using the engine; a motor generator control part that is configured to control the motor generator in response to a switching control signal supplied from a control unit; a first electrical energy storage device that is positioned at the upper turning body; a second electrical energy storage device that is positioned at the upper turning body and is electrically connected to the motor generator control part; a charge/discharge control part that is positioned at the upper turning body and is configured to control a charge/discharge operation between the first electrical energy storage device and the second electrical energy storage device in response to an externally supplied control command signal; a motor that is positioned at the upper turning body and is electrically connected to the second electrical energy storage device, the motor being configured to perform a regeneration operation for generating electric energy from mechanical energy and store the electric energy generated by the regeneration operation in the second electrical energy storage device; and the control unit that is configured to supply a control signal to at least one of the motor generator control part and the charge/discharge control part; wherein the control unit is configured to set a second electrical energy storage target value for the second electrical energy storage device to a higher value than a first electrical energy storage target value for the first electrical energy storage device during the regeneration operation performed by the motor, and wherein, during a period in which the motor performs a power running operation, the control unit sets the second electrical energy storage target value for the second electrical energy storage device to a higher value than a previous electrical energy storage target value for the second electrical energy storage device that is set up before the motor performs the power running operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling a hybrid excavator including a lower running body;
- an upper turning body that is positioned on the lower running body;
a boom including one end that is rotatably attached to the upper turning body;
an engine that is positioned at the upper turning body;
a motor generator that is positioned at the upper turning body and is configured to perform an assist operation for the engine and an electric power generating operation using the engine;
a motor generator control part that is configured to control the motor generator in response to a switching control signal supplied from a control unit;
a first electrical energy storage device that is positioned at the upper turning body;
a second electrical energy storage device that is positioned at the upper turning body and is electrically connected to the motor generator control part;
a charge/discharge control part that is positioned at the upper turning body and is configured to control a charge/discharge operation between the first electrical energy storage device and the second electrical energy storage device in response to an externally supplied control command signal; and
a motor that is positioned at the upper turning body and is electrically connected to the second electrical energy storage device, the motor being configured to perform a regeneration operation for generating electric energy from mechanical energy and store the electric energy generated by the regeneration operation in the second electrical energy storage device, the method comprising the steps of;supplying a drive control signal to at least one of the motor generator control part and the charge/discharge control part; and setting a second electrical energy storage target value for the second electrical energy storage device to a higher value than a first electrical energy storage target value for the first electrical energy storage device during the regeneration operation performed by the motor, and wherein, during a period in which the motor performs a power running operation, the control unit sets the second electrical energy storage target value for the second electrical energy storage device to a higher value than a previous electrical energy storage target value for the second electrical energy storage device that is set up before the motor performs the power running operation. - View Dependent Claims (10, 11, 12)
- an upper turning body that is positioned on the lower running body;
Specification