Design, Modeling, and Validation of a High-Speed Rotary Pulse-Width-Modulation On/Off Hydraulic Valve

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Haink C. Tu ◽  
Michael B. Rannow ◽  
Meng Wang ◽  
Perry Y. Li ◽  
Thomas R. Chase ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Pulse Width ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Hydraulic Systems ◽  
Rotary Valve ◽  
Output Pressure ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Actuation Power

Efficient high-speed on/off valves are an enabling technology for applying digital control techniques such as pulse-width-modulation (PWM) to hydraulic systems. Virtually variable displacement pumps (VVDPs) are one application where variable displacement functionality is attained using a fixed-displacement pump paired with an on/off valve and an accumulator. High-speed valves increase system bandwidth and reduce output pressure ripple by enabling higher switching frequencies. In addition to fast switching, on/off valves should also have small pressure drop and low actuation power to be effective in these applications. In this paper, a new unidirectional rotary valve designed for PWM is proposed. The valve is unique in utilizing the hydraulic fluid flowing through it as a power source for rotation. An unoptimized prototype capable of high flow rate (40 lpm), high speed (2.8 ms transition time at 100 Hz PWM frequency), and low pressure drop (0.62 MPa), while consuming little actuation power (<0.5% full power or 30 W, scavenged from fluid stream), has been constructed and experimentally validated. This paper describes the valve design, analyzes its performance and losses, and develops mathematical models that can be used for design and simulation. The models are validated using experimental data from a proof-of-concept prototype. The valve efficiency is quantified and suggestions for improving the efficiency in future valves are provided.

Modeling and Validation of a High Speed Rotary PWM On/Off Valve

2009 ◽  
Author(s):  
Haink C. Tu ◽  
Michael B. Rannow ◽  
Meng Wang ◽  
Perry Y. Li ◽  
Thomas R. Chase
Keyword(s):  
High Speed ◽  
Pulse Width Modulation ◽  
Hydraulic Systems ◽  
Rotary Valve ◽  
Flow Area ◽  
Output Pressure ◽  
Critical Technology ◽  
Variable Displacement ◽  
Pressure Ripple ◽  
Actuation Power

Efficient high-speed on/off valves are a critical technology for enabling digital control of hydraulic systems via pulse-width-modulation (PWM). High-speed valves, when used in virtually variable displacement pumps (VVDP), increase system bandwidth and reduce output pressure ripple by enabling higher PWM frequencies. Our approach to achieving high speed and large flow area with low actuation power is a unidirectional rotary valve designed specifically for PWM. In comparison to conventional valves, the rotary valve reduces valve actuation power from a cubic dependence on PWM frequency to a square dependence by eliminating motion reversals during transition. This paper presents experimental data that validates the rotary valve concept, valve design equations, and dynamic model of a rotary valve based VVDP. Our unoptimized prototype exhibits 65% efficiency at 50% displacement and 15Hz PWM frequency while the validated model projects that an optimized valve is capable of achieving 85% efficiency at 15Hz and 73% at 75Hz.

High-Speed 4-Way Rotary On/Off Valve for Virtually Variable Displacement Pump/Motor Applications

2011 ◽  
Author(s):  
Haink C. Tu ◽  
Michael B. Rannow ◽  
Meng Wang ◽  
Perry Y. Li ◽  
Thomas R. Chase ◽  
...  
Keyword(s):  
High Speed ◽  
Hydraulic Systems ◽  
Rotary Valve ◽  
Hydraulic Pump ◽  
Hydraulic Hybrid ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Pump Valve ◽  
Cycle Efficiency ◽  
Physical Displacement

The application of switched mode control to hydraulic systems has the potential of decreasing component complexity, size, and cost. This is accomplished by enabling variable pump or motor functionality using a single on/off valve paired with a compact, inexpensive fixed displacement machine. A 4-way tandem rotary on/off valve is presented in this paper that extends a novel rotary valve concept (experimentally validated for pump applications) to hydraulic pump/motors. The pump/valve system is referred to as a Virtually Variable Displacement Pump/Motor (VVDPM) since the effective displacement of the system is variable and not the physical displacement of the pump itself. This paper investigates the design and efficiency of the proposed rotary valve when utilizing the VVDPM on a light weight power-split hydraulic hybrid passenger vehicle that is driven over a standard federal drive cycle. Simulated VVDPM efficiency maps are presented for motoring and pumping and the cycle efficiency of an optimized VVDPM is compared to that of a typical bent axis unit. Vehicle fuel economy is also explored through simulation.

Dynamic vacuum pressure tracking control with high-speed on-off valves

2018 ◽  
Vol 232 (10) ◽  
pp. 1325-1336 ◽  
Author(s):  
Gang Yang ◽  
Kai Chen ◽  
Linglong Du ◽  
Jingmin Du ◽  
Baoren Li
Keyword(s):  
Mass Flow ◽  
Pulse Width ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Sliding Mode ◽  
Tracking System ◽  
Vacuum Pressure ◽  
Chamber Pressure ◽  
Asymmetric Structure ◽  
The Impact

A vacuum pressure tracking system with high-speed on-off valves is a discontinuous system due to the discrete nature of high-speed on-off valves. Chamber pressure changes in the system are determined by the mass flow rates during the processes of charging and discharging. Here, a sliding mode controller with an asymmetric compensator based on average mass flow rate is designed for accurate vacuum pressure tracking. The controller output signal is converted into the duty cycles of the high-speed on-off valves via a pulse width modulation pulsing scheme. Owing to the extreme asymmetry of the processes, an asymmetric structure comprising one high-speed on-off valve in the charging unit and three high-speed on-off valves in the discharging unit is applied to weaken the impact of asymmetry. In addition, an asymmetric compensator is also designed to modify the pulse width modulation pulsing scheme to further eliminate the asymmetry. Experimental results indicate that the proposed controller achieves better performance in pressure tracking with the asymmetric compensator overcoming process asymmetry and enhancing system robustness.

Investigation on adaptive pulse width modulation control for high speed on/off valve

2020 ◽  
Vol 34 (4) ◽  
pp. 1711-1722
Author(s):  
Qiang Gao ◽  
Yuchuan Zhu ◽  
Zhang Luo ◽  
Niyomwungeri Bruno
Keyword(s):  
Pulse Width ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Modulation Control

scholarly journals Performance analysis of a high-speed on/off valve based on an intelligent pulse-width modulation control

2017 ◽  
Vol 9 (11) ◽  
pp. 168781401773324 ◽  
Author(s):  
Qi Zhong ◽  
Bin Zhang ◽  
Hua-Yong Yang ◽  
Ji-En Ma ◽  
Rong-Fong Fung
Keyword(s):  
Performance Analysis ◽  
Pulse Width ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Modulation Control

scholarly journals Space Vector Pulse Width Modulation for High-Speed Induction Motor Implemented in Nios II Softcore Processor

2018 ◽  
Vol 3 (1) ◽  
pp. 99-107
Author(s):  
Maciej Chojowski
Keyword(s):  
Induction Motor ◽  
Pulse Width ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Classical Method ◽  
Hardware Description Language ◽  
Description Language ◽  
Space Vector ◽  
Nios Ii ◽  
Hardware Description

Abstract The purpose of the article was to present the idea of space vector pulse width modulation (SVPWM) and implementation in Nios II softcore processor. The SVPWM module was described in a classical method in hardware description language both as an independent structure and as an additional component to softcore processor. The available methods were compared, and the experiment was carried out in the laboratory to test implemented SVPWM algorithm using high-speed induction motor.

scholarly journals PENGENDALIAN KECEPATAN MOTOR DC DENGAN METODA FUZZY LOGIC BERBASIS MIKROKONTROLLER

2018 ◽  
Vol 1 (2) ◽  
pp. 1-12
Author(s):  
Nasrul Harun
Keyword(s):  
Fuzzy Logic ◽  
Pulse Width ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Control Process ◽  
Dc Motor ◽  
Small Scale ◽  
Motor Speed ◽  
Fuzzy Logic Method ◽  
Logic Method

The Technology and information development involve production process in industries using microcontroller as a brain in control process. The number  of control process with microcontroller using Fuzzy Logic method to get the function as is needed. Motors DC are used in some  equipment as a driver, not only in small scale but also in huge scale. It used in low or high speed too. The way of controlled chosen depend on the function of DC motor movement. The another method is Pulse Width Modulation (PWM). This is an effective method to controlled DC motor. This method produces square pulses which have specific comparison between high pulse and low pulse. It is usual scale from 0% to 100%. In this research, both Fuzzy Logic method and Pulse Width Modulation (PWM) method base of microcontroller ATMega 8535, both are integrated to control lthe  DC motor speed.

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