Hydraulic system, control method and wheel excavator: Fid-Bau Portal

Hydraulic system, control method and wheel excavator

OK YOU-EUN / LIU XIAOQIANG / HE BING / MO JIAYOU

The invention relates to a hydraulic system, and aims to solve the problem that an existing hydraulic system is difficult to be compatible with large-flow control and small-flow fine control. The invention provides a hydraulic system, a control method and a wheel excavator. An oil inlet and a first working oil port of an electric proportional valve in the hydraulic system are correspondingly connected with a pressure oil source and a first oil port of a hydraulic execution part; an oil inlet and an oil outlet of the opening and closing electromagnet are correspondingly communicated with an oil inlet and a first working oil port of the electric proportional valve, and the controller outputs an electric proportional valve control current used for controlling the opening degree of a valve port from the oil inlet of the electric proportional valve to the first working oil port according to a control signal of the control device; and when the control signal is smaller than or equal to the valve port full-opening minimum signal value, the controller controls the opening and closing electromagnetic valve to be in a cut-off state, and otherwise, the controller controls the opening and closing electromagnetic valve to be in a conducting state. According to the invention, fine operation control of small flow and high-speed action operation control of large flow can be well compatible.

本发明涉及液压系统，为解决现有液压系统中难以兼容大流量控制与小流量精细化控制的问题；提供一种液压系统、控制方法和轮式挖掘机，其中液压系统中电比例阀的进油口和第一工作油口对应与压力油源和液压执行件的第一油口连接；开闭电磁的进油口和出油口对应与电比例阀的进油口和第一工作油口连通，控制器依据操纵装置的操纵信号输出用于控制电比例阀进油口至第一工作油口的阀口开度的电比例阀控制电流；当操纵信号小于等于阀口全开最小信号值时所述控制器控制开闭电磁阀处于截止状态，否则控制开闭电磁阀处于导通状态。本发明能很好地兼容小流量的精细化操作控制和大流量高速动作操作控制。

Zugriff

Download

Seitennavigation

Dokumentinformationen

Ähnliche Titel

Exportieren, teilen und zitieren