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:
Jul. 22, 2003
Filed:
May. 03, 2001
Wolfgang Danz, Friedrichshafen, DE;
Andreas Piepenbrink, Meersburg, DE;
Andreas Schwenger, Friedrichshafen, DE;
ZF Batavia L.L.C., Batavia, OH (US);
Abstract
Within the scope of the method for adjusting the ratio value for a continuously variable transmission having a variator, a minimum contact pressure force P , and/or P is continuously calculated for the two variator discs on the basis of the actual ratio and of the actual torque to be transmitted and according to the calculated contact pressure minimum force the primary or the secondary disc is determined as controlled variable to be used for the variator ratio, the controlled variable being determined by a comparison of the required pressure values P or P with the calculated contact-pressure minimum value in a manner such that if P ≦P , the controlled variable changes from the primary to the secondary side and if the condition P ≦P is fulfilled, the secondary side changes to the primary side, the primary side being the controlled variable at the start of the method.