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. 08, 2003
Filed:
Oct. 26, 2000
Bernd Löffler, Ravensburg, DE;
ZF Batavia, L.L.C., Batavia, OH (US);
Abstract
A method is described for control of a CVT automatic transmission ( ) in which a sensed main pressure (p_hd_act) and a sensed contact pressure (p_s _act) of a secondary pulley ( ) are entered as signals in an electronic transmission control ( ). For diagnosis of an error in the sensing of the main pressure (p_hd_act) and/or of the contact pressure (p_s _act) of the secondary pulley ( ) their actual values or comparison variable (|p_hd_act-p_hd_nom|, |p_s _act-p_s _nom|) formed therefrom are compared with applicable threshold values (p_hd_min, pd_phd_regdiff, p_s _min, pd_ps _regdiff) associated with a range of plausible pressure values.