Abstract
High speed on/off valves (HSV) have often been used to control flow or pressure in digital hydraulic systems due to higher switching frequency. However, the dynamic performance and energy efficiency are highly affected by the supply pressure and the carrier frequency. In this paper, a new adaptive PWM control method for HSV based on software is proposed. The proposed adaptive PWM consists of a reference PWM, an excitation PWM, a high frequency PWM, and a reverse PWM. First, the nonlinear model of the HSV was established, and the structural composition and working principle of the proposed adaptive PWM control strategy were presented. Secondly, individual feedback controllers for the excitation PWM, the high frequency PWM, and the reverse PWM were designed, respectively; and each of the individual feedback controllers was experimentally verified. Finally, the comparative experimental results demonstrated that, with the proposed adaptive PWM control, the rising delay time of the control pressure drastically reduces by 84.6 % (from 13 ms to 2 ms), the duty cycle's effective range remains large (12 %-85 %) even with high carrier frequency (100 Hz), and the temperature rise of the valve's coil shell is reduced by 61.5 %, compared to the three-voltage control. In addition, the dynamic performance and the energy efficiency of the HSV are not affected by the supply pressures and carrier frequencies, which proves that the proposed control strategy can improve the robustness and stability of the valve system.
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This work was supported by the National Natural Science Foundation of China (grant number 51975275, 51575258).
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Qiang Gao received the B.S. in 2014 in Mechanical Engineering at Nanjing Institute of Technology and received the M.S. in 2017 in Mechanical Engineering at Yanshan University. He is currently a Ph.D. candidate in the College of Mechanical and Electrical Engineering at Nanjing University of Aeronautics and Astronautics. His research interests are digital hydraulics and smart materials.
Yuchuan Zhu is currently a Professor at National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing, China. He received the M.S. from Anhui University of Science and Technology, Huainan, China, in 2003 and the Ph.D. from Nanjing University of Science and Technology, Nanjing, China, in 2007. His research interests include smart material and structure technology, and fluid power transmission and control.
Zhang Luo received the B.S. in Mechanical Engineering from Taiyuan University of Technology, Taiyuan, China, in 2014 and the M.S. in Mechanical Engineering from Nanjing University of Aeronautics and Astronautics, Jiangsu, China, in 2019. His research interests include High speed on/off valve and smart materials.
Niyomwungeri Bruno received the B.S. in Mechanical Engineering from the University of Rwanda, Kigali, Rwanda, in 2015 and he is currently pursuing the M.S. in Mechatronic Engineering at Nanjing University of Aeronautics and Astronautics, Nanjing, China. His research interests include smart materials-based actuators and digital fluid power systems.
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Gao, Q., Zhu, Y., Luo, Z. et al. Investigation on adaptive pulse width modulation control for high speed on/off valve. J Mech Sci Technol 34, 1711–1722 (2020). https://doi.org/10.1007/s12206-020-0333-y
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DOI: https://doi.org/10.1007/s12206-020-0333-y