Modeling and position sliding mode control of a hydraulic actuators using on/off valve with PWM technique

Adeli, Mahdieh; Kakahaji, H.

doi:10.1109/sce.2011.6092125

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…In Ref. [11], two switching valves were used to control the speed of the hydraulic motor, and a sliding mode controller was designed to control the duty cycle of the PWM to overcome some parameter uncertainties. In the four HSV-controlled pneumatic servo systems, sixteen possible input combinations are presented and analyzed [12,13].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Adaptive Control with Asymmetric Pressure Difference Compensation of a Hydraulic Pressure Servo System Using Two High Speed On/Off Valves

Gao

2022

Machines

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A hydraulic pressure servo system based on two high-speed on/off valves (HSV) is a discontinuous system due to the discrete flow of HSV when driven by pulse width modulation (PWM) signal. Pressure variation in the testing chamber is determined by the flow rate difference between the charging and discharging HSV. In this paper, a pressure controller consisting of a differential PWM (DPWM) scheme, asymmetric pressure difference compensation (APDC) and nonlinear adaptive control (NAC) is proposed to precisely control the pressure. The DPWM scheme is designed to improve the resolution of the net flow rate into the testing chamber. Furthermore, due to the strong asymmetry between the charging and the discharging process, the APDC method is proposed to design the two initial duty cycles of the DPWM signal which help to balance its charging and discharging ability under different working pressure points. Since the pressure system is a nonlinear, uncertain system due to oil compression and leakage, the NAC is designed to calculate the control duty cycle of the DPWM signal, which is used to overcome the unmodeled dynamic and parameter uncertainties. Comparative experiments indicate that the proposed controller can ensure good pressure tracking performance and enhance system robustness under different working pressure points and tracking frequencies.

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Section: Introductionmentioning

confidence: 99%

Nonlinear Adaptive Control with Asymmetric Pressure Difference Compensation of a Hydraulic Pressure Servo System Using Two High Speed On/Off Valves

Gao

2022

Machines

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“…[6][7][8][9] As a consequence, the HSDV holds a lot of prospective applications in various fields and equipment for pressure and position control, such as machinery industry, automobile, aviation, high-speed reciprocating drill, as well as crushing machine and printer. 10,11 In consideration of the desirable characteristics associated with the HSDV, experts and scholars have conducted many relevant works and efforts on the structural design, specific application, and service performance of the HSDV. For instance, Yamada et al 12 developed a high-speed on/off digital valve for use in a hydraulic control system and found that the switching time of the valve is less than 0.7 ms. Rannow et al 13 utilized the high-speed on/off valve for the control of hydraulic systems as a way to avoid the inefficiency associated with the throttling valves.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of priority control system for high-speed on–off digital valve

Zeng

Wang

et al. 2015

Advances in Mechanical Engineering

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Dynamic characteristics of the priority control system are of great influence to the control effect, response speed, and working stability of the high-speed on–off digital valve. The main focus of this study is on revealing the dynamic properties of the priority control system for a developed high-speed on–off digital valve. In this article, a detailed introduction to the high-speed on–off digital valve and its priority control system is performed first, which includes the system function, structural composition, and operation principle. Thereafter, a simulation model of the priority control system is established using the AMESim software and the dynamic characteristics are simulated. Simulation results including the variations in the pulse-width modulation signal, coil current, and the main spool displacement of the directional valve are presented and discussed. They indicate that the opening time of the main spool increases with the duty ratio of the voltage signal. Moreover, the main spool displacement is basically equal in one single pulse-width modulation signal cycle, and thus, it is proportional to the cycle number of the pulse-width modulation signal. As a consequence, the priority control system possesses a good dynamic characteristic for the high-speed on–off digital valve as a pilot valve to achieve proportional control of main spool displacement for the directional valve.

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“…In order to decrease the cost and complexity, high-speed on-off valve (HSV) is proposed with the advantage of low-cost, compact structure, antipollution, high speed responsibility, adjusted by pulse, and so forth [3]. HSV has been used in many situations, for example, pressure control [4] and position control [5]. With the mechanical and electromagnetic inertia leading the flow delay, many researchers have applied some methods to deal with the flow delay.…”

Section: Introductionmentioning

confidence: 99%

Collaborative Synchronization Digital Control for Double Hydraulic Cylinders

Liu

Gao

Chen

et al. 2014

Advances in Mechanical Engineering

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By researching the synchronization motion of double hydraulic cylinders controlled by high-speed on-off valve, the paper aims to solve the shortage of current hydraulic synchronization system with low synchronization precision. The flow characteristic of high-speed on-off valve with pulse width-frequency modulation is researched compared with pulse width modulation. The mathematical equations of the double hydraulic cylinders are formulated with bulk-cavity-node method in MATLAB/Simulink. The collaborative synchronization control is analyzed and the compound algorithm of collaborative synchronization control and pulse width-frequency modulation is simulated compared with collaborative synchronization control. The hydraulic loop is set up to verify the simulation result with the proposed control algorithm on the FESTO platform. The research finds that (1) the pulse width-frequency modulation control can be linear to the flow of high-speed on-off valve on the duty bound of 0∼100%; (2) the collaborative synchronization control is effective to eliminate the displacement error between the double cylinders which results from the different load environment and other disturbance.

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Modeling and position sliding mode control of a hydraulic actuators using on/off valve with PWM technique

Cited by 5 publications

References 4 publications

Nonlinear Adaptive Control with Asymmetric Pressure Difference Compensation of a Hydraulic Pressure Servo System Using Two High Speed On/Off Valves

Nonlinear Adaptive Control with Asymmetric Pressure Difference Compensation of a Hydraulic Pressure Servo System Using Two High Speed On/Off Valves

Dynamic characteristics of priority control system for high-speed on–off digital valve

Collaborative Synchronization Digital Control for Double Hydraulic Cylinders

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