Enhancing safety of independent metering systems for mobile machines by means of fault detection

B. Beck
Technische Universität Dresden, Dresden, Germany

J. Weber
Technische Universität Dresden, Dresden, Germany

Ladda ner artikelhttp://dx.doi.org/10.3384/ecp1714492

Ingår i: Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden

Linköping Electronic Conference Proceedings 144:9, s. 92-102

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Publicerad: 2017-12-20

ISBN: 978-91-7685-369-6

ISSN: 1650-3686 (tryckt), 1650-3740 (online)


Systems with independent metering offer a high potential for increasing the functionality and efficiency of valve-controlled hydraulic drives. But nowadays there are only a few prototypical applications. One reason for that are the so far insufficient safety investigations. Besides the structural investigations carried out at the research institute, this contribution deals with a fault detection by means of limit checking of the applied pressure sensors. A detection algorithm is derived from several software-in-the-loop simulations of the independent metering system applied at an excavator arm. The functionality and limits of the fault detection will be shown by means of measurements. As a result, all safety-critical faults can be detected which leads to a Diagnostic Coverage of DC = 99% and thus allows the use of independent metering up to a Performance Level PL = e.


Hydraulic systems, independent metering, machine safety, ISO 13849, fault detection


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