Passive hydraulic control with position correction by...

F - Mech Eng,Light,Heat,Weapons – 15 – B

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F15B 7/10 (2006.01) B61F 5/38 (2006.01)

Patent

CA 2611405

The invention relates to a passive hydraulic controller, in which the volumes V 1 and V 2 at the two sides of the piston of two or more hydraulic cylinders (1) in each case are connected to one another hydraulically, so that a displacement of the piston in one of the cylinders (1) results in a displacement of the piston in at least one of the other cylinders (1) (follow- up control). The sum of all the piston travels .DELTA.s = k 1 s 1 +k 2 s 2 +... + k n s n in hydraulic controllers of said type should ideally always be .DELTA.s = 0 = const, with the proportionality factors k 1 ; k 2 ... k n representing the reciprocal of the piston surfaces of the cylinder (1), and their signs being dependent on whether the connecting lines (2) between the hydraulic cylinders (1) are crossed or not. Passive hydraulic controllers of the generic type are, however, not positionally stable over time (.DELTA.s.noteq.O.noteq.const), in particular under the action of static basic loads. A varying positional error .DELTA.s must be taken into consideration, said varying positional error .DELTA.s being corrected according to the invention in that in each case when the positional error .DELTA.s exceeds a positive positional error limit +.DELTA.s which is to be defined, or falls below a negative positional error limit -.DELTA.s which is to be defined, a connection is produced between the two volumes V 1 undV 2 for the purpose of exchanging hydraulic fluid between the two volumes, in that said connection always permits the exchange of hydraulic fluid in only one direction which is determined as a function of the sign of the positional error .DELTA.s, in that said connection at least

L'invention concerne une commande hydraulique passive, dans laquelle les volumes V 1 et V 2 des deux côtés des pistons de plusieurs cylindres hydrauliques (1) sont reliés hydrauliquement, de sorte qu'un déplacement du piston dans un des cylindres (1) entraîne un déplacement du piston dans au moins un des autres cylindres (1) (commande séquentielle). Idéalement, la somme de toutes les courses de piston ?s = k1s1+k2s2+... +knsn dans des commandes hydrauliques de ce type devrait toujours être ?s= 0 = const, les facteurs de proportionnalité k1 ; k2 ... kn représentant le réciproque des surfaces de piston des cylindres (1) et leurs signes dépendant du fait que les lignes de raccordement (2) entre les cylindres hydrauliques (1) sont croisées ou non. Cependant, la position de commandes hydrauliques passives de ce type n'est pas stable dans le temps (?s?0?const), en particulier sous l'effet de charges de base statiques et il faut s'attendre à une erreur de position variable ?s. L'objectif de l'invention est de corriger cette erreur. A cet effet, lorsque l'erreur de position ?sdépasse une limite positive d'erreur de position à définir +?s ou est inférieure à une limite négative d'erreur de position -?s, une liaison est établie entre les deux volumes V 1 et V 2 afin de permettre l'échange de fluide hydraulique entre ces deux volumes ; cette liaison autorise toujours l'échange de fluide hydraulique dans un seul sens qui est déterminé en fonction de signes de l'erreur de position?s ; cette liaison

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