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Power matching method of hydraulic excavator

A technology of hydraulic excavator and matching method, applied in the direction of earth mover/shovel, construction, etc., to achieve the effect of stable rotation speed, soft operation and balanced action

Inactive Publication Date: 2011-08-17
龙工(上海)机械制造有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above is the introduction of some characteristics of the engine. So far, there is no mature method for the hydraulic excavator to use the power of the engine to meet the needs of the excavator on the basis of analyzing the above characteristics.

Method used

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  • Power matching method of hydraulic excavator

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Embodiment

[0020] A kind of power matching method of hydraulic excavator provided by the present invention, its steps are:

[0021] Step 1. According to the known engine speed-power characteristic data, set multiple speeds and output different powers to meet the output requirements of different working conditions. Rotating speed;

[0022] Step 2. When the hydraulic excavator is working, adjust the maximum proportional valve current value of the hydraulic pump of the hydraulic excavator at the corresponding speed to the target current I ob , so that the power of the hydraulic pump matches the output power of the engine;

[0023] Step 2.1, detect the real-time speed of the engine, obtain the corresponding engine output power according to the known engine speed-power parameters, and simultaneously detect the pressure P of the hydraulic pump, that is, the size of the external load;

[0024] Step 2.2, hydraulic pump power=pressure P*flow Q=pressure P*displacement V*engine speed n=engine out...

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Abstract

The invention relates to a power matching method of a hydraulic excavator, which comprises the following steps: setting a plurality of rotating speeds and outputting different powers according to the known rotating speed of an engine-power characteristic data so as to meet the requirement of different work conditions; the power matching method is characterized in that when the hydraulic excavatorworks, the method causes that the power of a hydraulic pump and the output power of the engine are matched; when the external load is suddenly added in the working process of the hydraulic excavator,the electric current I of a proportional valve of the hydraulic pump are amplified step by step so that the delivery volume V of the hydraulic pump is amplified step by step and finally the output power of the hydraulic pump is steadily increased; and when the external load is suddenly added in the working process of the hydraulic excavator, the dynamic actual electric current is output by tracking the variation condition of the rotating speed of the engine and the detected real-time pump pressure. The power matching method has the advantages of meeting the operational requirement of the excavator by using the power of the engine, thus achieving the purpose of increasing the operational efficiency and reducing the oil consumption.

Description

technical field [0001] The invention relates to a power matching method of a hydraulic excavator, which is used for power matching between a hydraulic system and a power system of the hydraulic excavator, and belongs to the technical field of hydraulic excavator power and hydraulic control. Background technique [0002] The hydraulic power of the hydraulic excavator (that is, the load of the excavator) is characterized by unstable jumps, and is closely related to the working conditions, and the power output requirements of different working conditions are different. Reasonable use of engine power to meet the needs of excavator operations can improve efficiency on the one hand, and is also a requirement for energy saving on the other hand. [0003] The power output characteristics of the engine are as figure 1 As shown, when the throttle position of the engine is fixed, the output power changes with the speed, and the economical and efficient area of ​​the output power is in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/22
Inventor 郑可文王彦章龚润弘李锋伟
Owner 龙工(上海)机械制造有限公司
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