JPH03107502U

JPH03107502U -

Info

Publication number: JPH03107502U
Application number: JP1699390U
Authority: JP
Priority date: 1990-02-22
Filing date: 1990-02-22
Publication date: 1991-11-06

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例を示すブロツク図
、第２図ａは負荷圧力と制御流量との一例を示す
特性図、第２図ｂは負荷圧力と特性変換器出力の
一例を示す特性図、第３図はこの考案の他の実施
例を示すブロツク図、第４図ａは弁差圧と制御流
量との一例を示す特性図、第４図ｂは弁差圧と特
性変換器出力の一例を示す特性図、第５図は従来
の閉ループ速度制御装置の一例を示すブロツク図
である。図において、１……ＰＩＤ補償器、３……圧力
源、４……比例電磁式流量制御弁、５……油圧ア
クチユエータ、８……圧力センサ、９……速度セ
ンサ、１２……特性変換器、１３……掛算器であ
る。なお、各図中同一符号は同一または相当部分
を示す。 Fig. 1 is a block diagram showing an embodiment of this invention, Fig. 2a is a characteristic diagram showing an example of load pressure and control flow rate, and Fig. 2b is a characteristic diagram showing an example of load pressure and characteristic converter output. Fig. 3 is a block diagram showing another embodiment of this invention, Fig. 4a is a characteristic diagram showing an example of valve differential pressure and control flow rate, and Fig. 4b is a characteristic diagram of valve differential pressure and characteristic converter output. FIG. 5 is a block diagram showing an example of a conventional closed loop speed control device. In the figure, 1... PID compensator, 3... Pressure source, 4... Proportional electromagnetic flow control valve, 5... Hydraulic actuator, 8... Pressure sensor, 9... Speed sensor, 12... Characteristic converter. , 13... is a multiplier. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims

[Scope of Claim for Utility Model Registration] (1) In a closed-loop speed control device that controls the speed of a hydraulic actuator using a proportional electromagnetic flow control valve that operates based on an input value, the load pressure applied to the hydraulic actuator is detected and converted into an electrical signal. A feed forward comprising: a pressure sensor for converting the load pressure; a characteristic converter for converting the load pressure into a flow rate signal related to control of the hydraulic actuator; and a multiplier for correcting the input value based on the output of the characteristic converter. A closed loop speed control device characterized in that it performs control. (2) The closed loop speed control device according to claim 1, wherein the load pressure is a differential pressure between the input and discharge output of the proportional electromagnetic flow control valve.