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首页> 外文会议>FPST-vol.12; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >SELECTION OF OPERATING MODES OF A MULTI-FUNCTIONAL HYDRAULIC DEVICE
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SELECTION OF OPERATING MODES OF A MULTI-FUNCTIONAL HYDRAULIC DEVICE

机译：多功能液压装置的工作模式选择

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摘要

The field of earth moving equipment is experiencing a transformation due to the introduction of more electronic control capability and advanced control concepts. Conventional hydraulic control systems are controlled by proportional directional spool valve. The construction of the spool valve is such that a given position of the spool determines the flow in and the flow out restriction sizes. Thus, metering in and metering out are dependent or coupled. A certain restriction size on the inlet corresponds to a certain restriction size on the outlet. Therefore, we have one degree of freedom. It can provide for good motion control but it cannot achieve energy saving potential at the same time. In this paper, the concept of 'independent meter in/meter out' will be emphasized. Decoupling of meter in from meter out provides for more controllability and potential for energy saving in overrunning load cases when compared with a conventional spool valve controlled hydraulic system. A four-valve configuration controlling a hydraulic cylinder will be stressed. The four-valve configuration can operate in several modes because each of the four valves is controlled separately from the others. Five of these metering modes will be pointed out; two conventional modes and three regenerative modes. An industry system supplier has introduced a novel distributed independent metering in/meter out hydraulic system with actuator force feedback. This control system is going to pre- sented in brief. The distributed, actuator mounted implementation of this system maximizes the efficiency of the regeneration flow by minimizing the line losses associated with the re-circulating fluid. This control system can be used to control a multi-functional hydraulic device, e.g. excavators, tractor loader backhoes, etc...An experiment was done where a typical dig cycle was performed by a tractor loader backhoe equipped with this new technology. The data recorded from this experiment is used to perform an off-line optimization of metering modes selection for each function during the cycle. this off-line optimization can be used to maximize machine productivity or machine efficiency or a weighted combination of both. A general objective function will be presented and results will be given for maximizing machine productivity. Finally conclusions and future work suggestions are presented.
机译：由于引入了更多的电子控制功能和先进的控制概念，土方设备领域正在经历变革。常规液压控制系统由比例方向滑阀控制。滑阀的结构应使滑阀的给定位置决定流入和流出的限制尺寸。因此，计量和计量是相互依赖或耦合的。入口上的特定限制尺寸对应于出口上的特定限制尺寸。因此，我们有一个自由度。它可以提供良好的运动控制，但不能同时实现节能潜力。在本文中，将强调“独立的仪表进/出仪表”的概念。与传统的滑阀控制液压系统相比，仪表输入与输出输出的解耦提供了更多的可控制性，并在超负荷情况下节省了能源。控制液压缸的四阀配置将受到压力。四阀配置可在几种模式下运行，因为四个阀中的每个阀都是彼此独立控制的。将指出其中的五种计量模式。两种常规模式和三种再生模式。一家行业系统供应商推出了一种新颖的，具有执行器力反馈功能的分布式独立计量/进/出液压系统。将简要介绍该控制系统。该系统的分布式安装在执行器上的实现方式通过使与再循环流体相关的管路损失最小化，使再生流的效率最大化。该控制系统可用于控制多功能液压装置，例如挖掘机，拖拉机装载机反铲等...进行了一项实验，其中配备了这项新技术的拖拉机装载机反铲进行了典型的挖掘循环。从该实验中记录的数据用于对周期内每个功能的计量模式选择进行离线优化。这种离线优化可用于最大化机器生产率或机器效率或两者的加权组合。将介绍一个通用的目标函数，并给出使机器生产率最大化的结果。最后提出结论和今后的工作建议。

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