ADJUSTABLE FLOW-CONTROL VALVE FOR THE SELF-ENERGISING ELECTRO-HYDRAULIC BRAKE

Authors

  • Michael Kuehnlein RWTH Aachen University, Institute for Fluid Power Drives and Controls (IFAS), Steinbachstr. 53, D-52074 Aachen, Germany
  • Julian Ewald Michael Kuehnlein He received his Dipl.-Ing. in Mechanical Engineering from RWTH Aachen University, Germany in 2009. Since 2009 he is with the Institute for Fluid Power Drives and Controls (IFAS) at the same university. His research focus is on the Self-energising Electro- Hydraulic Brake and includes non-linear control.
  • Hubertus Murrenhoff RWTH Aachen University, Institute for Fluid Power Drives and Controls (IFAS), Steinbachstr. 53, D-52074 Aachen, Germany
  • Julian Ewald American University of Beirut (AUB), Faculty of Engineering and Architecture (FEA), Riad El Solh, Beirut 1107 2020, Lebanon

Keywords:

hydraulic brake, self-energising, brake torque control, leakage-free adjustable flow-control valve, flow-control valve, integrated valve

Abstract

This paper presents the design and performance of an electrically adjustable flow control valve. It is designed specifically for the self-energising electro-hydraulic brake which requires small volume flows, a fail-safe open characteristic, a leakage tight closed position, simple control by just one solenoid, good dynamics, and repeatability. The valve concept is based on a conventional pressure compensator design usually found in flow-control valves. The measuring orifice used to sense the flow through the valve is typically constant. In the presented design it is made adjustable using a hydro-mechanical pilot servo mechanism. The pilot is actuated by a proportional solenoid. The paper explains static flow equations used to parameterise the design. Dynamic simulation is used to validate the design before manufacturing. Measurements of the prototype show a good match with the simulation. Measurements of the main characteristics of the valve are shown, specifically the dynamic response to a step input as well as the flow-signal tracking and load pressure disturbance rejection behaviour. The valve is also tested in its target application, the self-energising electro-hydraulic brake, where it proves its effectiveness in normalising the response time of the non-linear and the inherently unstable brake. As opposed to a non-linear or gain scheduling control, with the new valve the controller of the brake can be designed as a simple switching control. This is an advantage for the overall brake's safety evaluation and therefore helps to improve the prospects of using the self-energising brake in future applications such as rail vehicles.

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Author Biographies

Michael Kuehnlein, RWTH Aachen University, Institute for Fluid Power Drives and Controls (IFAS), Steinbachstr. 53, D-52074 Aachen, Germany

Michael Kuehnlein He received his Dipl.-Ing. in Mechanical Engineering from RWTH Aachen University, Germany in 2009. Since 2009 he is with the Institute for Fluid Power Drives and Controls (IFAS) at the same university. His research focus is on the Self-energising Electro- Hydraulic Brake and includes non-linear control.

Julian Ewald, Michael Kuehnlein He received his Dipl.-Ing. in Mechanical Engineering from RWTH Aachen University, Germany in 2009. Since 2009 he is with the Institute for Fluid Power Drives and Controls (IFAS) at the same university. His research focus is on the Self-energising Electro- Hydraulic Brake and includes non-linear control.

Julian Ewald He received his Dipl.-Ing. in Mechanical Engineering from RWTH Aachen University, Germany in 2007. He received his PhD from RWTH Aachen University in 2011. Since 2007 he is with IFAS. Since 2010 he is group leader “System and Control Technology”. His research focus is on the Self-energising Electro- Hydraulic Brake.

Hubertus Murrenhoff, RWTH Aachen University, Institute for Fluid Power Drives and Controls (IFAS), Steinbachstr. 53, D-52074 Aachen, Germany

Hubertus Murrenhoff He received his Dipl.-Ing. and PhD degree in Mechanical Engineering from RWTH Aachen University, Germany. From 1978 until 1986 he was with the Institute of Hydraulic and Pneumatic Drives (IHP). After eight years in industry as of October 1994 he is Executive Director of the Institute for Fluid Power Drives and Controls (IFAS) in conjunction with the corresponding chair at RWTH Aachen University, Germany. The renamed Institute IFAS was the former IHP headed by Professor Backé until 1994. Besides other involvements since 1999 he is Chairman of the Board of ‘Network of Fluid Power Centres in Europe‘ (FPCE).

Julian Ewald, American University of Beirut (AUB), Faculty of Engineering and Architecture (FEA), Riad El Solh, Beirut 1107 2020, Lebanon

Matthias Liermann He received his Dipl.-Ing. in Mechanical Engineering from RWTH Aachen University, Germany in 2004. From 2004 until 2009 he was with IFAS. He received his PhD from RWTH Aachen University in 2008. Since 2009 he is Assistant Professor at the American University of Beirut (AUB), Beirut, Lebanon where he teaches control and automation.

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Published

2012-08-01

How to Cite

Kuehnlein, M., Ewald, J., Murrenhoff, H., & Ewald, J. (2012). ADJUSTABLE FLOW-CONTROL VALVE FOR THE SELF-ENERGISING ELECTRO-HYDRAULIC BRAKE. International Journal of Fluid Power, 13(2), 5–14. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/233

Issue

2012: Vol 13 Iss 2

Section

Original Article

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