The impact of peak-and-hold and reverse current solenoid driving strategies on the dynamic performance of commercial cartridge valves in a digital pump/motor

Authors

  • Farid Breidi Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA http://orcid.org/0000-0003-4959-3292
  • Tyler Helmus Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA
  • John Lumkes Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA

DOI:

https://doi.org/10.1080/14399776.2015.1120138

Keywords:

Digital hydraulics, High speed on/off valves, Pump/ Motor, Peak and Hold, Valve driving strategies

Abstract

Valve dynamics play an important role in existing fluid power systems and are key enablers to a wide range of digital hydraulic systems. Varying the electrical input signal to the solenoids is used to improve the dynamic performance and response times of on–off valves by reducing the eddy currents and coil inductance. This work examines the effects of the peak-and-hold and reverse current driving strategies on the performance of two commercially available direct actuated valves, and the resulting impact on the efficiency of a digital pump/motor. An electric circuit was designed to execute the driving strategies and a single valve hydraulic test stand was assembled to perform the valve timing studies. The differential pressure across the valves was found by installing the valves between two high frequency pressure transducers, allowing the calculation of the transition and delay time of the valves. The durations of the peak and reverse voltage signals were varied over a range of 0–10 ms with a 1 ms increment. Peak voltages were between 50 and 55 V, followed by a holding voltage of 12 V. The optimum response was found at peak duration of 6–8 ms. A reverse current strategy was used to increase the decay rate of the eddy currents during a turn-off response, improving the response time. The modified peak-andhold input signal was able to improve the turn-on response time of a commercially available valve from a range of 33–55 ms to a range of 7–9 ms, while the reverse current signal was able to improve the turn-off response time from around 130 ms to a range of 16–50 ms. These valves were then tested both in simulation and experimentally on a three-piston digital pump/motor to examine the improvement of the pump/motors efficiency resulting from the improvement of the valves switching times. The improvement in valve performance resulted in significant energy savings; up to 15 and 12% in the simulation model and digital pump/motor test stand respectively.

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Author Biographies

Farid Breidi, Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA

Farid Breidi received his BE degree from the American University of Beirut in 2010, the MSE from the University of Wisconsin- Madison in 2012, and is working towards PhD in the area of digital hydraulics at Purdue University. His research interests include fluid power systems, modeling and simulation, and component design.

Tyler Helmus, Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA

Tyler Helmus received his BSE degree from Calvin College in 2012 and is currently working towards his doctorate at Purdue University with a focus on digital hydraulics. His research interests include mechatronics, fluid power systems, simulation, and design.

John Lumkes, Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA

John Lumkes received the BSE degree from Calvin College in 1990, the MSE from the University of Michigan-Ann Arbor in 1992, and the PhD from the University of Wisconsin-Madison in 1997. From 1997 to 2004 he was an assistant and associate professor at Milwaukee School of Engineering. In 2004, he joined Purdue University where he is an associate professor and is active in digital hydraulics, modeling and controls, mechatronics, and design.

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Published

2016-03-01

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Original Article