JPS63187703U

JPS63187703U -

Info

Publication number: JPS63187703U
Application number: JP7944287U
Authority: JP
Priority date: 1987-05-26
Filing date: 1987-05-26
Publication date: 1988-12-01
Also published as: JPH0442561Y2

Description

[Brief explanation of the drawing]

第１図は本考案の第１実施例によるピストンシ
リンダ装置の位置決め制御回路を示す回路図、第
２図はデイザの加算がない場合のウインドコンパ
レータ回路の特性図、第３図はデイザが加算され
た場合のウインドコンパレータ回路の出力状態と
電磁切換弁のオン・オフ動作の関係を示すタイム
チヤート、第４図は本考案の第２実施例によるピ
ストンシリンダ装置の位置決め制御回路を示す回
路図、第５図は従来のピストンシリンダ装置とそ
の油圧回路を示す概略図、第６図は従来の他のピ
ストンシリンダ装置とその油圧回路を示す概略図
、第７図は従来のさらに他のピストンシリンダ装
置とその油圧回路を示す概略図、第８図は電磁切
換弁のコイル電圧とコイル電流との関係を示す波
形図である。図中、符号１……差動トランス（フイードバツ
クセンサ）、２……検波回路、３……偏差検出回
路、４……ジヨイステツク（指令装置）、５……
ヒステリシス付きウインドコンパレータ回路、６
ａ，６ｂ……比較器、１１……デイザ電圧発生回
路、１２……抵抗回路、１３……駆動回路、１７
，１８……電磁切換弁。 Fig. 1 is a circuit diagram showing a positioning control circuit for a piston-cylinder device according to the first embodiment of the present invention, Fig. 2 is a characteristic diagram of the window comparator circuit when dither is not added, and Fig. 3 is a characteristic diagram when dither is added. FIG. 4 is a time chart showing the relationship between the output state of the window comparator circuit and the on/off operation of the electromagnetic switching valve when Fig. 5 is a schematic diagram showing a conventional piston cylinder device and its hydraulic circuit, Fig. 6 is a schematic diagram showing another conventional piston cylinder device and its hydraulic circuit, and Fig. 7 is a schematic diagram showing another conventional piston cylinder device and its hydraulic circuit. A schematic diagram showing the hydraulic circuit, and FIG. 8 is a waveform diagram showing the relationship between the coil voltage and coil current of the electromagnetic switching valve. In the figure, numerals 1... differential transformer (feedback sensor), 2... detection circuit, 3... deviation detection circuit, 4... joystick (command device), 5...
Window comparator circuit with hysteresis, 6
a, 6b...Comparator, 11...Dither voltage generation circuit, 12...Resistance circuit, 13...Drive circuit, 17
, 18... Solenoid switching valve.

Claims

[Claims for Utility Model Registration] (1) At least two electromagnetic switching valves provided in the piston cylinder device for changing the flow path of the hydraulic circuit are energized and these electromagnetic switching valves are turned on. A positioning control circuit for a piston cylinder device capable of maintaining a piston in an intermediate state by: a command device for instructing the position of the piston; a feedback sensor for detecting the position of the piston; a command signal from the command device; a deviation detection circuit that detects a difference from the feedback signal from the feedback sensor; and a hysteresis device that determines whether to continue holding the piston or to move it based on the output signal of the deviation detection circuit. A positioning control circuit for a piston cylinder device, comprising a window comparator circuit and a dither voltage generation circuit that applies dither to any part of the circuit. (2) The positioning control circuit for a piston cylinder device according to claim 1, wherein the dither is added to each of a plurality of reference voltages included in the window comparator circuit. (3) The positioning control circuit for a piston cylinder device according to claim 1, wherein the dither is added to the command signal. (4) The positioning control circuit for a piston cylinder device according to claim 1, wherein the dither is added to the feedback signal. (5) The positioning control circuit for a piston cylinder device according to claim 1, wherein a dither is added to the output signal of the deviation detection circuit.