Practical Implementation of Secondary Control Principles in an Electro-Hydraulic Speed-Variable Drive Applied to an Injection Moulding Machine

Rasmus Aagaard Hertz, Ole Therkelsen, Søren Kristianen, Jesper Kjærsgaard Christensen, Christian-Emil Helver, Lasse Schmidt

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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Abstract

In this work, a hydraulic state of the art injection molding machine is retrofitted with a dual pump drive. The dual pump drive is an electro-hydraulic speed-variable drive, with focus on high bandwidth control through secondary control principles. Secondary control is based on providing the torque references for the electric machines directly, instead of a speed reference. The pressure control loop is based on decoupling of the piston load pressure and sum pressure enabling the possibility to utilize two SISO controllers. The application is the injection cylinder of an industrial injection molding machine, retrofitted with the designed dual pump drive. Experimental results for the proposed secondary control structure are presented and difficulties of implementation are documented, and a large gap between the theoretical achievable bandwidth and the experimental achievable bandwidth is shown. Three possible reasons for this gap are identified, namely amplification of high frequency components from e.g. signal noise on sensors, the use of axial piston pumps which induce pressure pulsations and the influence of the discrete sample time of the digital controller hardware. Lastly future work within the field is considered, including possible methods to minimize the influence of the identified issues.
Original languageEnglish
Title of host publicationProceedings of ASME/BATH 2023 Symposium on Fluid Power and Motion Control, FPMC 2023
Number of pages9
PublisherAmerican Society of Mechanical Engineers
Publication dateOct 2023
Pages1-9
Article numberv001t01a057
ISBN (Electronic)978-0-7918-8743-1
DOIs
Publication statusPublished - Oct 2023
Event2023 ASME/BATH Symposium on Fluid Power and Motion Control - Lido Beach Resort, Sarasota, Florida, United States
Duration: 16 Oct 202318 Oct 2023
https://event.asme.org/FPMC

Conference

Conference2023 ASME/BATH Symposium on Fluid Power and Motion Control
LocationLido Beach Resort
Country/TerritoryUnited States
CitySarasota, Florida
Period16/10/202318/10/2023
Internet address

Keywords

  • electro-hydraulic variable-speed drive
  • secondary control

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