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

Yang, Gang; Chen, Kai; Du, Li; Du, Jingmin; Li, Baoren

doi:10.1177/0959651818780866

Cited by 9 publications

(5 citation statements)

References 31 publications

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“…The multiple-valve structure of the discharging unit can thus satisfy the requirement of choosing the combination modes of the flow area, and thereby enable the flexible optimization of the balance between charging and discharging abilities by the controller. Due to the limitation of the pumping ability of the vacuum pump, the chamber pressure change rate in curve 6 is approximately equal to that recorded in curve 5 [23].…”

Section: Figure 2 Experimental Results Of System Charging and Dischamentioning

confidence: 82%

“…However, these studies used the expensive proportional/servo valve as the control element of the vacuum servo system. Accordingly, Gang Yang et al [23] designed a dynamic vacuum pressure tracking system with HSVs that adopted SMC strategy to improve the performance and robustness of control for accurate dynamic vacuum tracking a sinusoidal signal with a frequency of 2Hz. However, the above research can only achieve tracking control with low frequency (≤2Hz) pneumatic pressure [21]- [23].…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Backstepping Control of Vacuum Servo System Using High-Speed on-off Valves

Yang

Lei

et al. 2020

IEEE Access

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Using high-speed on-off valves (HSVs) with small size, low cost, and high switching accuracy instead of expensive proportional/servo valves, and researching high-performance vacuum servo system can further enhance the competitiveness of vacuum servo technology. However, due to the delay characteristics of high-speed on-off valve (HSV), the average gas mass flow rate of the output has dead zone, saturated zone and nonlinear zone. A linear compensation method for flow output is designed, so that the average gas mass flow rate of the output is approximately positively correlated with the duty cycle of the pulse width modulation (PWM) signal. Furthermore, because of the air compression and the leakage of the system, there exist parametric uncertainties, unmodeled dynamics and disturbances in the vacuum servo system. An adaptive backstepping control (ABC) strategy based on discontinuous projection mapping is designed. The adaptive backstepping control strategy inhibit the influence of system's parametric uncertainties through on-line update of the uncertain parameters, and uses its own robustness to eliminate the effects of unmodeled dynamics and disturbances. Compared with the sliding mode control (SMC) strategy, the experimental results show that when the tracking frequency reaches 3-4Hz, the adaptive backstepping control strategy can ensure good tracking performance. INDEX TERMS Adaptive backstepping control, High-speed on-off valves, Pulse width modulation, Vacuum servo system.

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Section: Figure 2 Experimental Results Of System Charging and Dischamentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Adaptive Backstepping Control of Vacuum Servo System Using High-Speed on-off Valves

Yang

Lei

et al. 2020

IEEE Access

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“…In Refs. [68,69], a negative pressure servo system, which is based on parallel HSVs and consists of a charging unit and a discharging unit, was designed. To eliminate the influences of operating points on the characteristics of the charging unit and discharging unit, an asymmetric compensation control algorithm of the PWM signal was proposed to achieve high-accuracy tracking at different frequencies and different pressures.…”

Section: Single Coding Control Strategy 411 Pwm Controlmentioning

confidence: 99%

Research Status and Prospects of Control Strategies for High Speed On/Off Valves

et al. 2023

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As the working conditions of host equipment become more complex and severe, performance improvement and increased intelligence of high speed on/off valves (HSV) are inevitable trends in the development of digital hydraulic technology. The characteristics of HSVs can be regulated by control strategies, which determine the comprehensive performance of the system. This paper discusses the development of control strategies for HSVs. First, the results of research in relation to the discrete voltage and pulse control of single HSVs and the coding control of parallel HSVs are summarized. In addition, the advantages, disadvantages and application scope of different control strategies are analyzed and compared. Finally, the development trends are predicted from the performance regulation, intelligent maintenance, intelligent coding and function programmability.

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“…In previous publications [15,22,23], the values of the initial duty cycles were all selected as 0.5. This is because when the initial duty cycle is 0.5, the output flow rates of the two HSVs are the same, and better linearity of the flow rate is obtained.…”

Section: Asymmetric Pressure Difference Compensation (Apdc)mentioning

confidence: 99%

“…In Ref. [22], an asymmetric structure comprising one HSV in the charging unit and three HSVs in the discharging unit were used to control the pressure in one chamber. In the research, a sliding mode controller with an asymmetric compensator was proposed to achieve high precision tracking of vacuum pressure.…”

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

Cited by 9 publications

References 31 publications

Adaptive Backstepping Control of Vacuum Servo System Using High-Speed on-off Valves

Adaptive Backstepping Control of Vacuum Servo System Using High-Speed on-off Valves

Research Status and Prospects of Control Strategies for 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

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