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:
Feb. 11, 2003
Filed:
Feb. 15, 2001
Andreas Wolf, Ravensburg, DE;
Matthias Winkel, Weingarten, DE;
Christoph Rüchardt, Wangen i. Allgäu, DE;
Bertram Wengert, Markdorf, DE;
Jürgen Müller, Friedrichshafen, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
The invention relates to a method for determining a starting gear step for a vehicle with a stepped variable speed transmission with several gear steps. It is proposed that a maximum admissible value for a slip time ( ) and/or a maximum admissible value for a frictional work ( ) of the starting clutch during the starting process, the same as an available engine torque ( ) for starting be determined, that beginning with a highest suitable gear step ( ) for starting, values for the slip time ( ) and/or the frictional work ( ) be calculated in advance depending on the vehicle mass ( ), that the precalculated values ( ) be compared with the maximum admissible values ( ), that the calculation loop be repeated with the next smaller suitable gear step for starting when at least one of the precalculated values is greater than the maximum admissible values and that a gear step be issued as starting gear step when the precalculated values are smaller than or equal to the maximum admissible values.