Control method for a hydraulic drive of a technical process

Details Control method for a hydraulic drive of a technical process Control method for a hydraulic drive of a technical process

G - Physics

05

B

G05B 19/19 (2006.01)

Patent

CA 2280971

According to the invention, the control method is used to produce a manipulated variable (y) to control a hydraulic mechanism (HA). To this end, at least one desired value (vs) for the speed of the hydraulic mechanism (HA), a first parameter (K1) which emulates the transmission procedure (KV, AO) of the hydraulic mechanism (HA), and a second parameter (K2) which emulates the internal resistance (KD, AK, AO), set against the hydraulic mechanism (HM) by the technical process (TP), are taken into account. One advantage is that non- linear sensitivities of the hydraulic mechanism can be taken into account to produce the manipulated variable (y) which controls the hydraulic mechanism (HA), thereby providing the added advantage of avoiding technically complex sensor technology. In one embodiment, the inventive control method is particularly useful for non-linear control of a plastic injection moulding machine.

Le procédé selon l'invention est utilisé pour l'obtention d'une valeur de réglage (y) pour la commande d'une transmission hydraulique (HA). A cet effet, on prend en considération au moins une valeur de consigne (vs) pour la vitesse d'entraînement (vi) du système de transmission hydraulique (HA), un premier paramètre (K1) simulant le comportement de transfert (KV, AO) de la transmission hydraulique (HA), et un deuxième paramètre (K2) simulant la résistance interne (KD, AK, AO) que le processus technique (TP) oppose au système de transmission hydraulique (HA). Pour l'obtention d'une valeur de réglage (y) commandant le système de transmission hydraulique (HA), il est avantageux de tenir compte des variations non linéaires du système de transmission hydraulique (HA), évitant ainsi de recourir à des moyens de détection compliqués à mettre en oeuvre. Suivant une forme d'exécution, le procédé selon l'invention est utilisé notamment pour la commande non linéaire d'une machine de moulage par injection pour les matières plastiques.

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