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Hybrid construction machine

  • US 9,217,239 B2
  • Filed: 08/21/2014
  • Issued: 12/22/2015
  • Est. Priority Date: 09/24/2013
  • Status: Active Grant
First Claim
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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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