Control method and control device for identifying working condition of excavator stick hydraulic cylinder
A control method and technology for hydraulic cylinders, which are applied to fluid pressure actuation devices, mechanical equipment, fluid pressure actuation system components, etc., can solve problems such as inaccurate identification of controller operating conditions, unstable operation of hydraulic cylinders, and frequent switching. , to achieve the effect of improving displacement accuracy, reducing pressure and speed fluctuations, and improving accuracy
Active Publication Date: 2022-07-01
YANSHAN UNIV
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[0003] However, the status of the stick is judged according to signals such as pressure and speed. When the collected signal fluctuates near the threshold, the controller will not recognize the working condition accurately, which will lead to frequent switching between different states of the system, spool vibration, hydraulic cylinder not running smoothly
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[0048] In order to detail the technical content, achieved objects and effects of the present invention, the following will be described in detail with reference to the accompanying drawings.
[0049] The invention relates to a control method suitable for identifying and judging working conditions of an excavator stick hydraulic cylinder and automatically selecting corresponding control signals for different working conditions. The control method controls the stick hydraulic cylinder 10 and can realize continuous and stable operation of the stick Require. The control method consists of a hydraulic module and a control module. The hydraulic module consists of a three-phase asynchronous motor 2, an electric proportional variable pump 1, a stick hydraulic cylinder 10, a safety valve 3, a back pressure valve 5, a displacement sensor 9, and a three-position sensor. It is composed of a three-way electromagnetic reversing valve and a pressure sensor. The control module is composed of...
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The present invention provides a control method and a control device for identifying the working condition of an excavator stick hydraulic cylinder. The specific steps of the method are: S1. Collect the outlet of the electric proportional variable pump, the stick hydraulic cylinder and the return valve respectively through a pressure sensor. The pressure of the oil tank, the displacement of the hydraulic cylinder is collected by the displacement sensor; S2, the actual displacement signal of the hydraulic cylinder collected by the displacement sensor in S1 is compared with the expected displacement signal, and the working condition category of the stick hydraulic cylinder is judged; S3. According to The working condition of the stick hydraulic cylinder obtained from S2 sends out the corresponding control signal. The device includes an electric proportional variable pump, a three-phase asynchronous motor, a safety valve, a pressure sensor, a back pressure valve, a three-position three-way electromagnetic reversing valve, a displacement sensor, a stick hydraulic cylinder and a controller. In the process of switching between different working conditions, the invention improves the accuracy of the working condition identification result, avoids the phenomenon of frequent switching of the hydraulic cylinder between different working conditions, improves the pressure fluctuation and makes the hydraulic cylinder run more stably.
Description
technical field [0001] The invention belongs to the technical field of intelligent identification and control of working conditions of hydraulic systems, in particular to an intelligent control method for identifying working conditions of excavator stick hydraulic cylinders, in particular to a method suitable for smooth switching between different complex working conditions control device. Background technique [0002] At present, the control of the stick hydraulic system of the valve-port independent excavator is mainly based on the collected pressure, speed and displacement signals, and the controller uses the set threshold to distinguish the different working conditions of the stick hydraulic cylinder, and then the controller outputs the corresponding The control signal of the working condition makes the stick move according to the predetermined planned trajectory. The method of identifying the working condition of the hydraulic cylinder by setting the threshold has the ...
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IPC IPC(8): F15B21/02F15B21/00F15B19/00
CPCF15B21/02F15B21/001F15B19/007
Inventor 李永泉胡双陈宁超陈伯文王力航张立杰袁晓明
Owner YANSHAN UNIV
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