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Apparatus and method for controlling a hydraulic pump of a construction machine

A technology of construction machinery and control devices, applied in pump control, mechanical equipment, liquid variable capacity machinery, etc., can solve problems such as engine flameout, and achieve the effect of optimizing the response speed

Active Publication Date: 2012-09-19
HYUNDAI DOOSAN INVIGORATE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the latter case, if the compensation torque value of the pump is greater than the maximum torque value of the engine, the engine will stall

Method used

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  • Apparatus and method for controlling a hydraulic pump of a construction machine
  • Apparatus and method for controlling a hydraulic pump of a construction machine
  • Apparatus and method for controlling a hydraulic pump of a construction machine

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Embodiment Construction

[0027] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] figure 1 It is a block diagram showing a schematic configuration of a hydraulic pump control device for a construction machine according to an embodiment of the present invention. refer to figure 1 , A hydraulic pump control device for a construction machine according to an embodiment of the present invention includes a pump control unit 30 that controls the discharge pressure of a hydraulic pump 20 directly connected to the engine 10 . The hydraulic pump 20 includes a swash plate 20 a, and the pump discharge flow rate (Qp) of the hydraulic pump 20 varies with the inclination angle of the swash plate 20 a, that is, the swash plate angle. A swash plate angle sensor (not shown) is provided on the swash plate 20 a, and the discharge flow rate (Qp) of the hydraulic pump 20 proportional to the detected swash plate angle is calculated and tr...

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Abstract

The present invention relates to an apparatus and method for controlling a hydraulic pump of a construction machine. The disclosed apparatus of the present invention comprises: a pump control unit which controls a discharge pressure of the hydraulic pump driven by an engine, wherein the pump control unit includes a set pressure value calculation unit which calculates a set pressure value on the basis of an engine output torque estimation value or an engine RPM; and a failure- handling unit which selects either the set pressure value and a pressure instruction value in accordance with whether or not failures of a swash plate angle sensor have occurred, and outputs the selected value.; According to the present invention, the set pressure value is calculated on the basis of the engine output torque estimation value, and the pump is controlled in accordance with the calculated set pressure value. Thus, it is possible to prevent a suction torque value of the pump from exceeding the maximum torque value of the engine even upon the occurrence of failures in the swash plate angle sensor, thereby preventing engine stall even upon the occurrence of failures in the swash plate angle sensor in a high-load work condition of the engine.

Description

technical field [0001] The present invention relates to a hydraulic pump control device and control method for construction machinery, and more specifically, to a hydraulic pump control device and control method for construction machinery including a hydraulic pump driven by an engine and whose compensation torque is variable according to a control signal . Background technique [0002] In order to control the hydraulic pump electrically, a swash plate angle sensor capable of detecting the angle of the swash plate is provided. The pump control unit calculates the discharge flow rate of the pump based on the detected swash plate angle, thereby calculating the pressure command value of the hydraulic pump and issuing the command. However, if the swash plate angle sensor fails, the pump control unit cannot know the pump discharge flow rate and cannot calculate the pressure command value. Therefore, an arbitrary preset pressure, that is, a pressure set value, is usually output a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22F04B27/04E02F9/24F04B27/18
CPCE02F9/2235F04B2203/0603F04B49/065F04B2203/0605F04B49/002F04B17/05F04B1/324E02F9/22E02F9/24F04B27/04F04B27/18
Inventor 郑雨容
Owner HYUNDAI DOOSAN INVIGORATE CORP
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