CONSTRUCTION MACHINE
First Claim
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1. A construction machine comprising:
- an engine;
a hydraulic pump that is driven by the engine;
a motor-generator that is coupled to the engine and to the hydraulic pump and capable of generating electrical power;
a hydraulic work device that is driven by a hydraulic fluid discharged from the hydraulic pump;
a swing structure on which the hydraulic work device is mounted;
an AC motor that drives the swing structure;
a power supply system having a capacitor that supplies electrical power to the motor-generator and/or to the AC motor and that becomes charged with electrical power regenerated by the motor-generator and/or by the AC motor; and
a controller that controls the power supply system;
wherein the controller includesan motion estimation section that estimates the next motion of the hydraulic work device and/or the swing structure in accordance with the current operation performed by an operator,an energy calculation section that calculates the amount of electrical power to be regenerated by the motor-generator and/or by the AC motor, in accordance with the estimated next operation, anda capacitor control section that sets a target voltage for the capacitor in accordance with the calculated amount of electrical power.
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Abstract
An object of the present invention is to provide a construction machine that is capable of effectively charging electrical power into the capacitor in consideration of the drive of a swing section and hydraulic work device. To achieve the object, the present invention grasps the status of the construction machine (2) in advance to calculate energy, predicts the next operation, determines the amount of energy to be charged into a capacitor (13), and controls a DC-DC converter (15) accordingly. Consequently, the loss in a conventional battery (lead storage battery) during regeneration can be reduced to provide increased efficiency.
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Citations
8 Claims
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1. A construction machine comprising:
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an engine; a hydraulic pump that is driven by the engine; a motor-generator that is coupled to the engine and to the hydraulic pump and capable of generating electrical power; a hydraulic work device that is driven by a hydraulic fluid discharged from the hydraulic pump; a swing structure on which the hydraulic work device is mounted; an AC motor that drives the swing structure; a power supply system having a capacitor that supplies electrical power to the motor-generator and/or to the AC motor and that becomes charged with electrical power regenerated by the motor-generator and/or by the AC motor; and a controller that controls the power supply system; wherein the controller includes an motion estimation section that estimates the next motion of the hydraulic work device and/or the swing structure in accordance with the current operation performed by an operator, an energy calculation section that calculates the amount of electrical power to be regenerated by the motor-generator and/or by the AC motor, in accordance with the estimated next operation, and a capacitor control section that sets a target voltage for the capacitor in accordance with the calculated amount of electrical power. - View Dependent Claims (2, 3, 4)
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5. A construction machine comprising:
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a power supply system having a capacitor that supplies electrical power to an AC motor for driving a swing structure and that becomes charged with electrical power regenerated by a motor-generator and/or by the AC motor, the swing structure being a structure on which the motor-generator and/or a hydraulic work device are mounted, the motor-generator being coupled to an engine and to a hydraulic pump and capable of generating electrical power, the hydraulic work device being driven by a hydraulic fluid discharged from the hydraulic pump; and a controller that controls the power supply system; wherein the controller estimates the next operation of the hydraulic work device and/or the swing structure in accordance with the current operation performed by an operator, calculates the amount of electrical power to be regenerated by the motor-generator and/or by the AC motor in accordance with the estimated next operation, and sets a target voltage for the capacitor in accordance with the calculated amount of electrical power. - View Dependent Claims (6, 7, 8)
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Specification