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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Huova, Mikko Linjama, Matti Siivonen, Lauri Deubel, Till Försterling, Heino Stamm, Edgar |
| Copyright Year | 2018 |
| Abstract | This paper studies a novel on/off-valve-based fine positioning method for hydraulic drives. The method proposed utilizes four on/off-valves in independent metering configuration to reach good positioning accuracy and low power losses. Previously, servo valves have been used in precise position control of hydraulic double acting cylinders. Another approach uses on/off-valves, which are typically driven by using pulse width modulation (PWM) or, if there are parallel connected valves, pulse code modulation (PCM). Typically, both cylinder sides are modulated simultaneously. The new concept proposed uses a cylinder model to calculate a correct opening sequence for the on/off-valves, such that the target piston position is reached. The method proposed modulates single cylinder side at a time in order to achieve small piston position step sizes. Despite relying on the modelled compressibility of the fluid, the method presented requires no knowledge about the bulk modulus of the fluid. It is enough that the bulk modulus of the fluid in both cylinder chambers can be assumed equal. The paper includes the design of the control method, a simulation study proving the validity of the method, and an experimental part investigating the performance in practice. The experimental results show a positioning accuracy of +/− 1 μm with an on/off-valve-based hydraulic drive, the maximum velocity of which is 0.7 m/s. |
| Sponsorship | Fluid Power Systems and Technology Division |
| File Format | |
| ISBN | 9780791851968 |
| DOI | 10.1115/FPMC2018-8891 |
| Conference Proceedings | BATH/ASME 2018 Symposium on Fluid Power and Motion Control |
| Language | English |
| Publisher Date | 2018-09-12 |
| Publisher Place | Bath, UK |
| Access Restriction | Subscribed |
| Subject Keyword | Pistons Design Fluids Compressibility Simulation Position control Pulse width modulation Valves Servomechanisms Bulk modulus Hydraulic drive systems Cylinders |
| Content Type | Text |
| Resource Type | Article |
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