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CONSTRUCTION MACHINE

  • US 20140147238A1
  • Filed: 10/04/2011
  • Published: 05/29/2014
  • Est. Priority Date: 10/14/2010
  • Status: Abandoned Application
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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