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Electrohydraulic control device for construction machine and method thereof

A technology for construction machinery and control devices, which is applied to fluid pressure actuation devices, mechanical equipment, servo meter circuits, etc., and can solve problems such as reducing the performance of construction machinery.

Active Publication Date: 2020-10-27
DOOSAN INFRACORE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, there is a problem that the pump pressure shows a working pressure different from the design specification, thereby reducing the performance of the construction machinery

Method used

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  • Electrohydraulic control device for construction machine and method thereof
  • Electrohydraulic control device for construction machine and method thereof
  • Electrohydraulic control device for construction machine and method thereof

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Embodiment Construction

[0029] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] In each drawing of the present invention, for the sake of clarity of the present invention, the size of the structure is shown enlarged than the actual size.

[0031] In the present invention, terms such as first and second may be used to describe various constituent elements, but these constituent elements should not be limited to these terms. These terms are used only for the purpose of distinguishing one constituent element from another constituent element.

[0032] The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. Expressions in the singular include expressions in the plural unless clearly defined differently in the context. In this application, terms such as "comprising" or "having" should be interpreted as specifying the existence of featur...

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PUM

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Abstract

An electrohydraulic control device for a construction machine comprises: a control valve, installed in a hydraulic line between a hydraulic pump and an actuator, for controlling an operation of the actuator according to the amount of displacement of a spool provided therein; a spool displacement adjusting valve for outputting a secondary pressure proportional to an input pressure command signal toa spool of the control valve to control the amount of displacement of the spool of the control valve; a pressure sensor for detecting the secondary pressure output from the spool displacement adjusting valve; and a control unit for outputting a pressure command signal to the spool displacement adjusting valve in accordance with an operation signal of the construction machine and correcting the pressure command signal when the pressure difference between the detected secondary pressure and a predetermined design pressure by the pressure command signal deviates from a predetermined allowable range.

Description

technical field [0001] The invention relates to an electro-hydraulic control device and method for engineering machinery. More specifically, it relates to an electronic control device and method for a construction machine having an electrohydraulic main control valve using an electronic proportional pressure reducing valve. Background technique [0002] Electrohydraulic main control valves that are electronically controlled by electronically proportional pressure reducing valves (EPPRV) may be used in construction machinery. Therefore, compared with the existing hydraulic main control valve, the danger caused by the failure of the electronic proportional pressure reducing valve is greater, which makes the countermeasure in case of failure more important. [0003] As the use period of the electronic proportional pressure reducing valve passes, the secondary pressure of the electronic proportional pressure reducing valve may be generated smaller or larger than the pressure co...

Claims

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Application Information

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IPC IPC(8): E02F9/22F15B21/08
CPCE02F9/2285E02F9/2228F15B13/0433F15B2211/327F15B2211/329F15B2211/575F15B2211/526F15B2211/50554F15B2211/6316F15B2211/665F15B2211/67F15B2211/6346F15B2211/30525F15B2211/3144F15B21/087E02F9/2221E02F9/2267F15B21/08E02F9/2235E02F9/2296F15B13/025F15B2211/6355F15B2211/36F15B2211/355
Inventor 金泰润张启凤
Owner DOOSAN INFRACORE CO LTD