Importance

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Abstract

A passive hydraulic controller is disclosed, in which the volumes V.sub.1 and V.sub.2 at the two sides of the piston of two or more hydraulic cylinders in each case are connected to one another hydraulically, so that a displacement of the piston in one of the cylinders results in a displacement of the piston in at least one of the other cylinders (follow-up control). The sum of all the piston travels .DELTA.s=k.sub.1s.sub.1+k.sub.2s.sub.2+ . . . +k.sub.ns.sub.n in hydraulic controllers of said type should ideally always be .DELTA.s=0=const, with the proportionality factors k.sub.1; k.sub.2 . . . k.sub.n representing the reciprocal of the piston surfaces of the cylinder, and their signs being dependent on whether the connecting lines between the hydraulic cylinders 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, the 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.sub.1 und V.sub.2 for the purpose of exchanging hydraulic fluid between the two volumes, in that the 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.

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First Claim