PWM-digital control of hydraulic actuator utilizing 2-way solenoid valves.

Muto, Takayoshi; Yamada, H.; Suematsu, Yoshikazu

doi:10.5739/jfps1970.19.564

Cited by 13 publications

(6 citation statements)

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“…• A functional relationship of the valve between the displacement x and time t is described by the equation comprised of a time lag and a linear stroking (Muto, 1990). • Each equation of two pipelines (l 1 , l 2 ) for connecting the valves and hydraulic cylinder is described by the equation of a lumped-parameter-system model with one-DOF.…”

Section: Mathematical Model For Simulation Analysismentioning

confidence: 99%

“…The first problem is how to minimize the moving resolution of the table (Mansfeld, 1978); here, the moving resolution means the table displacement per one pulse of input signal. The second is how to realize a smooth waveform for the displacement, under the operating condition of the ON/OFF control (Muto, 1990). The third is to reduce the oscillations and noises induced in Downloaded by [University of Connecticut] at 10:32 14 October 2014 the system to the lowest possible levels.…”

Section: Introductionmentioning

confidence: 99%

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A Precision Driving System Composed of a Hydraulic Cylinder and High-Speed on/off Valves

Tsuchiya

Yamada²,

Muto³

2001

International Journal of Fluid Power

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In manufacturing technology, the predominant tendency in recent years has been for machine tools, for example, turning-, milling-, and drilling-machines, to employ electrically operated actuators such as a servo-motor equipped with a ball screw. There are, however, various problems with these electric driving systems; they are excessively large-sized with complex machinery, and their application is expensive, as seen, for example, in the case of the NC-machine. In order to solve these problems, this study aims to develop a precision driving system actuated by a hydraulic cylinder. The hydraulic driving system consists of a cylinder and four ON/OFF solenoid valves. The valves are the same as those used in a fuel injector of an automobile, which are capable of high speed switching, as fast as 1.5 ms. It was confirmed in experiments that the developed system had a moving resolution of 1.2 μm and, as a result, was applicable to a precision driving table for micro-processing.

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Section: Mathematical Model For Simulation Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Precision Driving System Composed of a Hydraulic Cylinder and High-Speed on/off Valves

Tsuchiya

Yamada²,

Muto³

2001

International Journal of Fluid Power

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“…The mean flow or pressure is controlled by the duty cycle, defined as the time in the on position divided by the switching period. Switch-mode hydraulics have been proposed for buck/boost converters [2], pumps [3][4][5][6], linear actuators [7], engine valves [8], and multiple actuators [9]. The benefits of this approach are low cost, low weight, good response time, and improved efficiency over throttling valve control [3,9].…”

Section: Introductionmentioning

confidence: 99%

“…While the switching frequency limit for off-the-shelf solenoid valves is around 10 Hz [12], multiple researchers are developing high-speed valves specifically for switch-mode circuits. Highspeed valve designs reported in the literature include: solenoid valves [7,13], poppet valves [14], linear spool valves [4,15], and continuously rotating axial and radial flow valves [6,[16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Crank-Slider Spool Valve for Switch-Mode Circuits

Yudell

Koktavy

Ven

2015

ASME/BATH 2015 Symposium on Fluid Power and Motion Control

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A key component of switch-mode hydraulic circuits is a high-speed two-position three-way valve with a variable duty cycle. This paper presents a new valve architecture that consists of two valve spools that are axially driven by crank-slider mechanisms. By phase shifting the two crank links, which are on a common crankshaft, the duty cycle of the valve is adjusted. The two spools split and re-combine flow such that two switching cycles occur per revolution of the crankshaft. Because the spools move in a near-sinusoidal trajectory, the peak spool velocities are achieved at mid-stroke where the valve land transitions across the ports, resulting in short valve transition times. The spool velocity is lower during the remainder of the cycle, reducing viscous friction losses. A dynamic model is constructed of this new valve operating at 120 Hz switching frequency in a switch-mode circuit. The model is used to illustrate design trade-offs and minimize energy losses in the valve. The resulting design solution transitions to the on-state in 5% of the switching period and the combined leakage and viscous friction in the valve dissipate 1.7% of the total power at a pressure of 34.5MPa and volumetric flow rate of 22.8L/min.

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“…In 1988 Muto proposed a 2-way-solenoid-valves-system with PWM control for a hydraulic actuator [1]. In last decades digital hydraulic systems with different configurations have been more and more researched due to their potentials in higher efficiency performance and better characteristics of control methods.…”

Section: Introductionmentioning

confidence: 99%

An Zero-Flowrate-Switching (ZFS) Control Method Applied in a Digital Hydraulic System

Peng¹

2017

Linköping Electronic Conference Proceedings

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During past decades digital hydraulic technology has become the new trend in hydraulic area due to less consumed power, better controllability and larger tolerance of contaminations. In some digital hydraulic systems, PWM controller is applied to regulate the system flowrate. Thus pressure pulses and switching power loss resulted in by high frequent switching becomes the challenge of digital hydraulics. In this work, it aims to develop a control system where the digital valve always switches off at the moment when the value of the flowrate through the valve is around zero. In this paper a Zero-Flowrate-Swiching (ZFS) control system is presented in a application of a typical 2-valve digital hydraulic system. Operating principles and mathematical models are presented in the paper. According to the simulation results, the system with ZFS controller consumes 14.7% switching power loss compared to that of a HardSwitching (HS) control system. This gives a bright sight view that ZFS control method can be a potential solution for pressure pulses and switching power loss resulted by high frequent switching in digital hydraulic systems.

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PWM-digital control of hydraulic actuator utilizing 2-way solenoid valves.

Cited by 13 publications

References 0 publications

A Precision Driving System Composed of a Hydraulic Cylinder and High-Speed on/off Valves

A Precision Driving System Composed of a Hydraulic Cylinder and High-Speed on/off Valves

Crank-Slider Spool Valve for Switch-Mode Circuits

An Zero-Flowrate-Switching (ZFS) Control Method Applied in a Digital Hydraulic System

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