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Electro-hydraulic compound control hydraulic system of loader and control method thereof

A composite control, hydraulic system technology, applied in the direction of earth mover/shovel, construction, etc., can solve problems such as engine flameout, achieve the effect of strong adaptability and avoid high pressure overflow loss

Active Publication Date: 2015-05-27
XCMG CONSTR MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there are joint actions such as cutting into the stockpile at this time, the possibility of engine stalling is greater

Method used

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  • Electro-hydraulic compound control hydraulic system of loader and control method thereof
  • Electro-hydraulic compound control hydraulic system of loader and control method thereof
  • Electro-hydraulic compound control hydraulic system of loader and control method thereof

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Embodiment Construction

[0054] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] Such as figure 1 As shown, the loader electro-hydraulic composite control hydraulic system of the present invention includes a hydraulic oil tank 1, an engine 2, a variable pump 3, an electronically controlled reversing valve block 4, a third shuttle valve 5, a first shuttle valve 6, and a second shuttle valve 7 , distribution valve 8, pilot valve 11, pilot oil source block 12, electric control handle 26 and controller 27; the oil inlet port of the variable pump 3 is connected with the hydraulic oil tank 1; The oil inlet P1 is connected; the oil return port T1 of the distribution valve 8 is connected with the hydraulic oil tank 1; the oil inlet P2 of the pilot oil source block 12 is connected with the oil outlet P of the vari...

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Abstract

The invention discloses an electro-hydraulic compound control hydraulic system of a loader. The electro-hydraulic compound control hydraulic system comprises a hydraulic tank, an engine, a variable pump, an electric control reversing valve block, a first shuttle valve, a second shuttle valve, a third shuttle valve, a distribution valve, a pilot valve, a pilot oil source block, an electric control handle and a controller. The invention further provides a control method which uses the electro-hydraulic compound control hydraulic system of the loader. According to the electro-hydraulic compound control hydraulic system of the loader and the control method, staged compound control is performed according to actual working conditions of the loader, so as to guarantee good inching performance and manoeuverability when the loader slowly moves; when the loader quickly moves, energy losses can be further reduced, the loader can automatically adapt to actual load, and load impact on the pump is reduced; under high pressure and large load, the output of the hydraulic system is automatically adjusted, so as to reduce load impact on the engine and guarantee stable and reliable operation of the engine.

Description

technical field [0001] The invention relates to a loader hydraulic system, in particular to a loader electro-hydraulic composite control hydraulic system and a control method thereof. Background technique [0002] The loader is a kind of construction machinery with a very wide range of uses. Different uses and complex working conditions determine the complexity of its hydraulic system work. At present, the common hydraulic systems of loaders include dual quantitative systems, combined systems of quantitative pumps and variable pumps, and dual variable pump systems. As the society pays more and more attention to energy saving and environmental protection, the variable system with obvious energy saving effect is widely used in construction machinery. Among them, the dual-variable pump system that has attracted much attention is a more advanced variable system. Its typical control method is hydraulic load sensing control. Because of its simple and reliable control method and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22
Inventor 谢朝阳杨东升任大明马鹏鹏赵梅范小童胡重贺陈冉马锦锦
Owner XCMG CONSTR MACHINERY
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