Control circuit and control method for boom energy regeneration
First Claim
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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.
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Abstract
The present disclosure relates to a control circuit and a control method for boom energy regeneration, and the control circuit for boom energy regeneration includes: a control unit which controls a discharge amount control valve, such that the amount of oil, which is discharged from a head of a boom cylinder, is supplied to a regeneration device or a rod of the boom cylinder through a hydraulic regeneration line, and when the regeneration device has an abnormality, the amount of oil, which is discharged from the head of the boom cylinder, is supplied to the main control valve through a hydraulic discharge line.
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Citations
18 Claims
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1. A control circuit for boom energy regeneration, comprising:
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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 Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A control method for boom energy regeneration, comprising:
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determining whether an accumulator and a hydraulic motor, which regenerate energy of a boom cylinder for operating a boom of a construction machine, are normally operated, wherein the hydraulic motor is connected to a driving shaft of an engine and is configured to provide a rotational force to a hydraulic pump, and the accumulator is connected to a head of the boom cylinder and the hydraulic motor through a hydraulic regeneration line to accumulate an amount of oil discharged from the head of the boom cylinder or an amount of oil discharged from the hydraulic motor; and controlling a bypass valve provided between a main control valve and an operating unit for manipulating the boom so as to transmit control pressure generated by the operating unit to the main control valve, and to supply the main control valve with the amount of oil discharged from the head of the boom cylinder at the same time as an operation of lowering the boom, when it is determined that at least one of the accumulator and the hydraulic motor is erroneously operated. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification