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Piston position estimation for an electro-pneumatic actuator at standstill

Abstract : In this paper, a first strategy to reconstruct the piston position of a pneumatic cylinder supplied by two servovalves is proposed using only the chambers pressure measurements. This work focuses on the position observation at standstill. Starting from a classical model of this actuator, a transformation of the inputs is used. This way, for the first time, a link is established between electro-pneumatic actuators and Permanent Magnet Synchronous Motors (PMSM). This allows to apply PMSM zero speed observation strategies to electro-pneumatic actuators. Thus, following an observability analysis, a signal injection based methodology is used to ensure the observability of the electro-pneumatic system. A non-linear position observer is synthesized and a Lyapunov function is provided to ensure the global stability. Experimental results confirm the proposed strategy efficiency. The proposed technique constitutes a first step toward sensorless position control of electro-pneumatic actuators.
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https://hal.archives-ouvertes.fr/hal-01256427
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Submitted on : Tuesday, April 23, 2019 - 2:13:48 PM
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Frédéric Abry, Xavier Brun, Michaël Di Loreto, Sylvie Sesmat, Eric Bideaux. Piston position estimation for an electro-pneumatic actuator at standstill. Control Engineering Practice, Elsevier, 2015, 41 (8), pp.176-185. ⟨10.1016/j.conengprac.2015.04.016⟩. ⟨hal-01256427⟩

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