Analysis of Dynamic Characteristics and Power Losses of High Speed on/off Valve with Pre-Existing Control Algorithm

Zhong, Qing; Wang, Xiele; Xie, Geng; Yang, Huayong; Cheng, Yu; Xu, Enguang; Li, Yanbiao

doi:10.3390/en14164901

Cited by 14 publications

(4 citation statements)

References 25 publications

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“…In Refs. [45,46], a pre-existing voltage control algorithm which adapts to the different supply pressures was proposed, and the corresponding flow chart is presented in Figure 8. In this research, a low voltage was preloaded to the coil before the valve opened and the opening dynamic performance of the valve was improved by increasing the initial current.…”

Section: Four-voltage 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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Section: Four-voltage Controlmentioning

confidence: 99%

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

et al. 2023

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“…Wang et al 16 focused on addressing the spool oscillation of a dual-system direct drive servo valve and identified the pressure pulsation of the valve cavity shoulder surface caused by valve port cavitation as the primary factor contributing to valve spool oscillation. Zhong et al 17,18 investigated the dynamic characteristic and temperature rising characteristic of the high-speed on/off valve. Most of the studies focused on the oscillation of servo and poppet valves and the cavitation caused by oscillation.…”

Section: Introductionmentioning

confidence: 99%

Generation mechanism of high-frequency oscillation in proportional valve with a high-speed on/off valves bridge as the pilot stage

Li,

Ji,

Wei

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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A digital proportional valve has a main spool that operates with a high-speed on/off valves bridge as the pilot stage. However, this can cause the spool to undergo high-frequency oscillation during movement, leading to a slower valve response, lower control accuracy, and even control failure. Therefore, it is important to study the oscillation mechanism of the valve. To address this issue, we establish a detailed dynamic model of the digital proportional valve, and analyze the factors affecting the response performance of the proportional valve spool. A method of half-bridge control based on duty cycle is proposed to eliminate the oscillation. The influence regularity of each factor on the response performance of the valve is explored. It is proved that the control method of the high-speed on/off valves bridge and the Pulse-width modulation (PWM) signal-switching frequency of the high-speed on/off valves are the main reasons for the oscillation of the main spool. The proposed half-bridge control method based on duty cycle can eliminate the oscillation in a lower frequency range. In addition, the results show that the pilot oil pressure is an important contributor to the oscillation; the higher the pilot oil pressure, the easier the main spool oscillation occurs. However, the spool mass, oil temperature, and coil temperature of the high-speed on/off valve do not affect the stability of the digital proportional valve.

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“…Generally, the opening and closing lag time of the HSV can be reduced through preloading a signal to make the current of the valve core close to the critical switch value. Zhong et al [24,25] proposed a pre-excitation control algorithm (PECA) based on the principle of multi-voltage driving, which reduced the lag time of the valve response, and improved the energy conversion efficiency. In [13], Zhong et al extended the controllable duty cycle range, by switching PWM signals with different amplitudes through real-time current feedback.…”

Section: Introductionmentioning

confidence: 99%

Pulse-Width-Modulation-Based Time-Delay Compensation Control for High-Speed On/Off Valves

Li,

Hao,

Wang

et al. 2023

Electronics

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The dynamic characteristics of high-speed on/off valves (HSVs) are a key factor in measuring their performance, and determining the control accuracy of valve-controlled systems. Furthermore, the hysteresis characteristics of HSVs can seriously affect their dynamic characteristics. This study evaluated the hysteresis characteristics of HSVs in a valve-controlled hydraulic control system, and considered the pressure changes in front of the valve during the opening and closing process of the valve core. A time-delay compensation control (TDCC) based on pulse-width modulation (PWM) was proposed. The reference PWM signal was used to control the opening and closing time of the HSV, while the loading signal was composed of an opening compensation PWM, an excitation PWM, an opening holding PWM, and a closing compensation PWM. Using an opening compensation PWM to start the initial current, combined with current feedback and pressure changes in front of the valve, the amplitude and duty cycle of different PWM signals were determined in real time. This reduced the time delay and working current of the HSV during opening and closing. A simulation comparison analysis was conducted, with a single PWM control and a pre-excitation control algorithm (PECA). The results showed that, compared to a single PWM control, the TDCC can reduce the overall opening and closing time delay by 78.1%, and the energy consumption by 64.7%. Compared with PECA, the overall opening and closing time delay was reduced by 10.9%, and the energy consumption was reduced by 28%. At the same time, the frequency response of the valve core displacement increased by 70%, compared to the single PWM control.

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Analysis of Dynamic Characteristics and Power Losses of High Speed on/off Valve with Pre-Existing Control Algorithm

Cited by 14 publications

References 25 publications

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

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

Generation mechanism of high-frequency oscillation in proportional valve with a high-speed on/off valves bridge as the pilot stage

Pulse-Width-Modulation-Based Time-Delay Compensation Control for High-Speed On/Off Valves

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