scholarly journals Digital Cotrol of Hydrulic Rotary Actuator System by the Method of Differential-Pulse Width Modulation.

1992 ◽  
Vol 23 (7) ◽  
pp. 839-846
Author(s):  
Takayoshi MUTO ◽  
Hiroki KATO ◽  
Kimihiro OHNO ◽  
Hironao YAMADA ◽  
Yoshikazu SUEMATSU
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Differential Pulse ◽  
Rotary Actuator ◽  
Actuator System

Investigation on positioning control strategy and switching optimization of an equal coded digital valve system

2019 ◽  
Vol 234 (8) ◽  
pp. 959-972
Author(s):  
Qiang Gao ◽  
Matti Linjama ◽  
Miika Paloniitty ◽  
Yuchuan Zhu
Keyword(s):  
Cost Function ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Differential Pulse ◽  
Pulse Number ◽  
Equal Distribution ◽  
Positioning Control ◽  
Valve System ◽  
Circular Buffer ◽  
Switching Method

This article concerns high accuracy positioning control with switching optimization for an equal coded digital valve system. Typically, pulse number modulation control cannot realize micro-positioning due to the characteristics of step-wise flow variation, therefore, a new position controller consisting of a model-based pulse number modulation and a differential pulse width modulation strategy is proposed to control the position of a hydraulic cylinder at high and low velocity cases, respectively. In addition, in order to solve several problems caused by the pulse number modulation and differential pulse width modulation, such as increased number of switchings and large difference among number of switchings of valves, a switching optimization consisting of a switching cost function, a circular buffer and a circular switching method is proposed. An adaptive weight of the switching cost function is proposed for the first time to reduce the total number of switchings under different pressure differences and its design criterion is presented. A circular buffer and a new circular switching method are used to improve the degree of equal distribution of switchings when the pulse number modulation and differential pulse width modulation are used, respectively. Comparative experimental results indicated that the average and the minimum positioning error for the proposed controller are only 10 and 1 μm, respectively. The number of switchings and the degree of equal distribution of switchings are significantly optimized. Moreover, the pressure fluctuations caused by the proposed controller remain acceptable.

scholarly journals Digital Control of Electrohydraulic Servosystem by Differential-Pulse Width Modulation.

1991 ◽  
Vol 57 (537) ◽  
pp. 1596-1603 ◽  
Author(s):  
Yoshikazu SUEMATSU ◽  
Hironao YAMADA ◽  
Tetuya TUKAMOTO ◽  
Takayoshi MUTO
Keyword(s):  
Digital Control ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Differential Pulse

Application of pulse width modulation and by-pass valve control for increasing energy efficiency of pneumatic actuator system

2018 ◽  
Vol 232 (10) ◽  
pp. 1314-1324 ◽  
Author(s):  
Dragan Šešlija ◽  
Stanimir Čajetinac ◽  
Vladislav Blagojević ◽  
Jovan Šulc
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Cross Flow ◽  
Good Alternative ◽  
Compressed Air ◽  
Pneumatic Actuator ◽  
Joint Application ◽  
Actuator System ◽  
Modulation Control ◽  
Valve Control

Control of a pneumatic actuator using pulse width modulation (control) represents a good alternative for control of pneumatic actuator that uses proportional valve. Important advantage of pulse width modulation control is fewer consumption of compressed air. In addition, air consumption can be further reduced by the use of inter-chamber cross flow (chamber by-passing). This article discusses joint application of pulse width modulation and by-pass chamber control on the example of pneumatic rodless cylinder which is controlled by programmable logic controller. Saving of compressed air was experimentally determined, as well as the influence of inter-chamber cross flow on the quality of the control. With this application of pulse width modulation and by-pass valve control, pneumatic actuator system shows that 30% of energy can be saved under the same working conditions in comparison to the traditional pulse width modulation control system.

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