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HYBRID EXCAVATOR BOOM ACTUATING SYSTEM AND METHOD FOR CONTROLLING SAME

  • US 20130291531A1
  • Filed: 12/26/2011
  • Published: 11/07/2013
  • Est. Priority Date: 12/24/2010
  • Status: Active Grant
First Claim
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1. A boom actuating system for use with a hybrid excavator, comprising:

  • an electric motor operated as a motor or a generator;

    an electricity storage device configured to store electricity generated in the electric motor;

    a hydraulic pump motor driven by the electric motor to supply hydraulic fluid to the boom;

    a boom control valve configured to selectively connect or disconnect an outlet line and an inlet line of the hydraulic pump motor to or from a head or a rod of a boom cylinder operating the boom;

    a motor bypass valve connected to the outlet line and the inlet line to interconnect the outlet line and the inlet line or disconnect the outlet line from the inlet line; and

    a controller configured to control the electric motor, the hydraulic pump motor, the boom control valve, and the motor bypass valve.

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