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Hydraulic pump control device for building machine

A technology for control devices and construction machinery, applied in pump control, fluid pressure actuation devices, construction, etc., can solve problems such as discomfort, reduce fuel efficiency, noise, etc., and achieve improved fuel efficiency, improved operability, and improved operability and fuel efficiency

Active Publication Date: 2014-04-02
DOOSAN INFRACORE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] If such a phenomenon occurs, it will cause noise or discomfort, make the operator feel a strong sense of fatigue, and reduce fuel efficiency

Method used

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  • Hydraulic pump control device for building machine
  • Hydraulic pump control device for building machine
  • Hydraulic pump control device for building machine

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Effect test

Embodiment Construction

[0034] Hereinafter, a hydraulic pump control device for a construction machine according to an embodiment of the present invention will be described.

[0035] refer to figure 2 A hydraulic pump control device for a construction machine according to an embodiment of the present invention includes a control unit 30 for controlling the torque increase rate of the hydraulic pump 20 so as to correspond to the torque increase rate of the engine 10 .

[0036] Since the hydraulic pump 20 is connected to the engine 10 , the torque of the hydraulic pump 20 directly acts on the engine 10 as a load. Therefore, if the torque of the hydraulic pump 20 is too large, the rotation speed of the engine 10 may decrease, and the driving of the engine 10 may be stopped.

[0037] The above hydraulic pump 20 is provided with a swash plate 20a, and the discharge amount of oil can be changed according to the inclination angle of the swash plate 20a. Therefore, when the discharge pressure of the hydra...

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Abstract

The invention provides a hydraulic pump control device for building machine, which is suitable for a building machine comprising an engine and a hydraulic pump. The hydraulic pump is connected with the engine and is driven by the engine, and the absorption toque changes according to the applied control signal. The hydraulic pump control device comprises a control portion that when the information related to the target rotation speed of the engine (Ncmd), the information related to the oil amount needed by the hydraulic pump (Qcmd), and the current output pressure of the hydraulic pump (Ppress), the torque needed by the pump (Trequest) is calculated according to the oil amount needed by the hydraulic pump (Qcmd) and the current output pressure of the pump (Ppress), the absorption torque of the hydraulic pump is changed, so that the time when the absorption torque of the hydraulic pump reaches the torque needed by the pump (Trequest) is delayed, which is correspondent to the time when the engine reaches the target engine torque corresponding to the target rotation speed of the engine (Ncmd).

Description

technical field [0001] The present invention relates to construction machines such as excavators, and more particularly to a hydraulic pump control device for a construction machine capable of controlling absorption torque of a hydraulic pump according to changes in engine torque. Background technique [0002] In order to improve fuel efficiency, construction machines such as excavators are set to automatically reduce the rotational speed of the engine without driving the work machine. At this time, the reduced engine speed is set according to the responsiveness when the working machine is re-driven. [0003] As an example, the engine is initially driven at an IDLE RPM of approximately 800 RPM. In addition, in order to drive the work machine, the operator sets the engine speed to approximately 2000 RPM to drive the work machine. However, if the working machine is not driven for a certain period of time, the engine speed is automatically reduced to about 1200 RPM (AUTO IDLE...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B49/00F04B49/20F04B17/00F04B17/05
CPCB60Y2200/41E02F9/2232E02F9/2296F15B2211/20523
Inventor 郑雨容
Owner DOOSAN INFRACORE CO LTD
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