Volume Flow Characterization of PWM-Controlled Fast-Switching Pneumatic Valves

Pipan, Miha; Herakovič, Niko

doi:10.5545/sv-jme.2016.3531

Cited by 16 publications

(10 citation statements)

References 22 publications

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“…We use the real experimental data which are collected from experiments instead of building valve models to solve these problems. This method of acquiring data is originally proposed by Pipan M. and Herakovič N. [21], and their work proves the feasibility of the method. We make some improvements to this method and test it in a different frequency range.…”

Section: Volume Flow Feature Of the Solenoid On-off Valvementioning

confidence: 78%

“…It is very inaccurate to use the simplified model and may cause problems in the following experiments. To solve this problem, Pipan M. and Herakovič N. [21,22] proposed a measuring method to find the correlation between the PWM frequency, the PWM duty cycle, and the volume flow of a PWM-driven valve. This method is a good replacement for traditional modeling.…”

Section: Introductionmentioning

confidence: 99%

“…The volume flow data are firstly acquired by several high-precision instruments. In the original volume flow control method from Pipan M. and Herakovič N. [21,22], the method of raw volume flow data with simple interpolation was used to control the valve. Based on their research, we manage to apply the segmented, polynomial fitting method to process the data.…”

Section: Introductionmentioning

confidence: 99%

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An Electro-Pneumatic Force Tracking System using Fuzzy Logic Based Volume Flow Control

Lin

Wei

et al. 2019

Energies

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In this paper, a fuzzy logic based volume flow control method is proposed to precisely control the force of a pneumatic actuator in an electro-pneumatic system including four on-off valves. The volume flow feature, which is the relationship between the duty cycle of the pulse width modulation (PWM) period, pressure difference, and volume flow of an on-off valve, is based on the experimental data measured by a high-precision volume flow meter. Through experimental data analysis, the maximum and minimum duty cycles are acquired. A new volume flow control method is introduced for the pneumatic system. In this method, the raw measured data are innovatively processed by a segmented, polynomial fitting method, and a newly designed procedure for calculating the duty cycle is adopted. This procedure makes it possible to combine the original data with fuzzy logic control (FLC). Additionally, the method allows us to accurately control the minimum and maximum opening pulse width of the valve. Several experiments are performed based on the experimental data, instead of the traditional theoretical models. Only 0.141 N (1.41%) overshoot and 0.03 N (0.03%) steady-state error are observed in the step response experiment, and 0.123 N average error is found while tracking the sine wave reference.

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Section: Volume Flow Feature Of the Solenoid On-off Valvementioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Electro-Pneumatic Force Tracking System using Fuzzy Logic Based Volume Flow Control

Lin

Wei

et al. 2019

Energies

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“…A mass flow sensor is used to measure the mass flow through a valve for different duty cycles and pressure ratios. We follow a similar procedure to that described in [26]. The duty cycle is set directly, while the pressure ratio is adjusted by changing the upstream source pressure and enforcing ambient pressure conditions at the valve outlet.…”

Section: A Valve and Pressure Dynamicsmentioning

confidence: 99%

Design, Modeling and Control of a Soft Robotic Arm

Hofer

D’Andrea

2018

2018 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

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In this paper we present the design of a hybrid robotic arm using soft, inflatable bladders for actuation. Low cost switching valves are used for pressure control, where the valve model is identified experimentally. A model of the robotic arm is derived based on system identification and used to derive a linear quadratic Gaussian controller. A method to solve limitations of the employed switching valves is proposed and experimentally proven to improve tracking performance. The closed loop control performance of the robotic arm is demonstrated by stabilizing a rotational inverted pendulum known as the Furuta pendulum.

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“…According to the ratio of the pressure of the upstream side p u to the pressure of downstream pressure p d , the flow equation for the flow through a restriction can be written as follows [17]:…”

Section: The New Kind Of Cae With Four Valvesmentioning

confidence: 99%

Dynamic Characteristics Research on Power System of a Four-Valve of Compressed Air Engine

2018

SV-JME

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To alleviate air pollution and eliminate pollutants from internal combustion engines, many researchers have paid more attention to compressed air engines (CAEs). However, the low energy utilization efficiency and low output power of a CAE hinder its development. In this paper, a new kind of CAE, which has four valves is proposed, which reduces the kinetic energy of the flowing air. Through analysis of the CAEs, a mathematical model of the working processes was developed. Using the simulation method, the performance of the new kind of CAE was obtained. To verify the theoretical model, a prototype of a four-valve of single cylinder piston type CAE was designed, and the experiment was carried out. Parameter influence analysis and optimization were studied to improve the four-valve CAE performance. Results show that, first, the output torque and output power of the four-valves of CAE are higher than of the two-valves of CAE. When the intake pressure is set at 0.6 MPa and 0.7 MPa, and the rotation speed is 450 rpm, the output torque of the four-valve of CAE is about 2.7 and 2.2 times that of the twovalve of CAE. The output torque and power differences between the two kinds of CAE ascend sharply with increased rotation speed. Second, the energy efficiency and output power are impacted significantly by the intake valve close angle and exhaust passage diameter. Thirdly, the optimization of the four-valve CAE can significantly enhance the output power compared with two-valve CAE. This research can be referred to in the design of the CAEs.

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Volume Flow Characterization of PWM-Controlled Fast-Switching Pneumatic Valves

Cited by 16 publications

References 22 publications

An Electro-Pneumatic Force Tracking System using Fuzzy Logic Based Volume Flow Control

An Electro-Pneumatic Force Tracking System using Fuzzy Logic Based Volume Flow Control

Design, Modeling and Control of a Soft Robotic Arm

Dynamic Characteristics Research on Power System of a Four-Valve of Compressed Air Engine

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