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. 06, 2009
Filed:
Jul. 09, 2007
Patrick Dreher, Bad Duerrheim, DE;
Martin Seufert, Steinheim, DE;
Frank Nageleisen, Kirchzarten, DE;
Patrick Dreher, Bad Duerrheim, DE;
Martin Seufert, Steinheim, DE;
Frank Nageleisen, Kirchzarten, DE;
GETRAG Getriebe- und Zahnradfabrik Hermann Hagenmeyer GmbH & Cie KG, Untergruppenbach, DE;
Abstract
A method for controlling an automated step-by-step variable transmission which has a plurality of gear stages which set up a different transmission ratio in each case. The method comprises the steps: a) detecting whether a gear stage is to be engaged, b) detecting an input actual variable which is substantially proportional to an input rotational speed of the step-by-step variable transmission, and an output actual variable which is substantially proportional to an output rotational speed of the transmission, c) checking as to whether a difference between a ratio of the input and the output actual variables and the transmission ratio which would be set up by the gear stage is smaller for a predefined timespan than a predefined tolerance range, and d) determining a fault state if the difference does not lie within the tolerance range for the predefined timespan.