The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 2009
Filed:
Feb. 03, 2005
Uwe Allerding, Ehbsen, DE;
Matthias Düwel, Hamburg, DE;
Thomas Stolten, Tremsbüttel, DE;
Jungheinrich Aktiengesellschaft, Hamburg, DE;
Abstract
Method for the adjustment of a control current of current-controlled, hysteresis-affected hydraulic valves for the actuation of individual hydraulic functions of industrial trucks, the control current being generated in an electronic control device according to a manually pre-set transmitter signal, characterised by the following steps for each hydraulic function which is controlled by a hydraulic valve, an average characteristic line I=f(Q) is determined by experiments or via calculation, in which I is the control current and Q is the volume flux of the hydraulic medium flowing through the hydraulic valve, the specific characteristic line I.sub.res=f(Q) is measured for each individual hydraulic valve, and a first average control current value for a predetermined volume flux value is determined from the characteristic line values, between the first average control current value and a second average control current value, which is derived from the determined characteristic line I=f(Q) at the pre-set volume flux value, the difference is formed and a constant is added, and the control current correction value thus determined is attached to the case of the individual hydraulic valve as a code, upon assembly of the hydraulic valve, the code is read out and memorised into the control device, for the purpose of correction of the respective control current, when the hydraulic function is triggered, for the control current correction value according to the characteristic line I=f(Q) laid down in the control device.