×

Control circuit and control method for boom energy regeneration

  • US 10,174,484 B2
  • Filed: 12/17/2014
  • Issued: 01/08/2019
  • Est. Priority Date: 12/26/2013
  • Status: Active Grant
First Claim
Patent Images

1. A control circuit for boom energy regeneration, comprising:

  • a boom cylinder configured to operate a boom of a construction machine;

    a regeneration device configured to regenerate energy of the boom cylinder;

    a hydraulic regeneration line configured to connect the boom cylinder and the regeneration device;

    a discharge amount control valve provided on the hydraulic regeneration line;

    a hydraulic discharge line branching off from the hydraulic regeneration line at a front of the discharge amount control valve and is connected to a main control valve; and

    a control unit configured to control the discharge amount control valve, such that an amount of oil discharged from a head of the boom cylinder is supplied to the regeneration device or a rod of the boom cylinder through the hydraulic regeneration line, and when the regeneration device has an abnormality, the amount of oil discharged from the head of the boom cylinder is supplied to the main control valve through the hydraulic discharge line,wherein the regeneration device includes;

    a hydraulic motor connected to a driving shaft of an engine, wherein the hydraulic motor is configured to provide a rotational force to a hydraulic pump; and

    an accumulator configured to accumulate the amount of oil discharged from the head of the boom cylinder or an amount of oil discharged from the hydraulic motor,wherein one end of the hydraulic regeneration line is connected to the head of the boom cylinder, and the other end of the hydraulic regeneration line is diverged to be connected to the hydraulic motor and the accumulator, respectively.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×