Hybrid construction machine
First Claim
1. A hybrid construction machine comprising:
- an engine;
a generator-motor configured to make a generator action and a motor action;
a hydraulic pump configured to be driven by the engine;
a hydraulic actuator configured to be operated by the hydraulic pump as a hydraulic pressure source;
an actuator regeneration section configured to make a regenerative action of generating actuator regenerated-electric-power through return fluid from the hydraulic actuator;
an electric storage device capable of being charged and discharging electric power stored therein;
a charging-rate detector configured to detect a charging rate of the electric storage device; and
a control section configured to perform;
causing the electric storage device to be charged with electric power generated by the generator-motor through the generator action and the actuator regenerated-electric-power generated by the actuator regeneration section through the regenerative action;
causing the generator-motor to make the motor action through electric power stored in the electric storage device to thereby assist the engine; and
a regeneration control of stopping the generator action of the generator-motor and restricting the actuator regenerated-electric-power to be generated by the actuator regeneration section when the charging rate of the electric storage device detected by the charging-rate detector is equal to or greater than a preset charging-rate limitation value,wherein the actuator regeneration section includes;
a regeneration circuit connected to the hydraulic actuator to allow return fluid from the hydraulic actuator to be flowed therein;
a regeneration motor provided in the regeneration circuit to be rotationally driven by the return fluid from the hydraulic actuator;
a flow regulating value configured to regulate a regeneration-flow-rate which is a flow rate of the return fluid flowing in the regeneration circuit; and
a regeneration generator configured to be driven by the regeneration motor to generate regenerated-electric-power, wherein the control section is configured to perform the regeneration control through the regulation of the regeneration-flow-rate by the flow regulating valve.
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Accused Products
Abstract
Provided is a hybrid construction machine capable of preventing overcharge, comprising: an engine; a generator-motor; a hydraulic pump; a hydraulic actuator to be operated by the hydraulic pump as a hydraulic pressure source; an actuator regeneration section to make a regenerative action of generating actuator regenerated-electric-power through return fluid from the hydraulic actuator; an electric storage device; a charging-rate detector; and a control section. The control section performs: causing the electric storage device to be charged with electric power generated by the generator-motor and the actuator regenerated-electric-power; causing the generator-motor to make a motor action through electric power stored in the electric storage device to assist the engine; and a regeneration control including stopping the generator action and restricting the actuator regenerated-electric-power, when a detected charging rate of the electric storage device is not smaller than a preset charging-rate limitation value.
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Citations
4 Claims
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1. A hybrid construction machine comprising:
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an engine; a generator-motor configured to make a generator action and a motor action; a hydraulic pump configured to be driven by the engine; a hydraulic actuator configured to be operated by the hydraulic pump as a hydraulic pressure source; an actuator regeneration section configured to make a regenerative action of generating actuator regenerated-electric-power through return fluid from the hydraulic actuator; an electric storage device capable of being charged and discharging electric power stored therein; a charging-rate detector configured to detect a charging rate of the electric storage device; and a control section configured to perform;
causing the electric storage device to be charged with electric power generated by the generator-motor through the generator action and the actuator regenerated-electric-power generated by the actuator regeneration section through the regenerative action;
causing the generator-motor to make the motor action through electric power stored in the electric storage device to thereby assist the engine; and
a regeneration control of stopping the generator action of the generator-motor and restricting the actuator regenerated-electric-power to be generated by the actuator regeneration section when the charging rate of the electric storage device detected by the charging-rate detector is equal to or greater than a preset charging-rate limitation value,wherein the actuator regeneration section includes;
a regeneration circuit connected to the hydraulic actuator to allow return fluid from the hydraulic actuator to be flowed therein;
a regeneration motor provided in the regeneration circuit to be rotationally driven by the return fluid from the hydraulic actuator;
a flow regulating value configured to regulate a regeneration-flow-rate which is a flow rate of the return fluid flowing in the regeneration circuit; and
a regeneration generator configured to be driven by the regeneration motor to generate regenerated-electric-power, wherein the control section is configured to perform the regeneration control through the regulation of the regeneration-flow-rate by the flow regulating valve. - View Dependent Claims (2, 3, 4)
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Specification