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:
Oct. 30, 2012
Filed:
Apr. 03, 2009
Ingo-gerd Sauter, Meckenbeuren, DE;
Ingo-Gerd Sauter, Meckenbeuren, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A control method and system for a vehicle transmission that incorporates gradient road resistance in selecting an appropriate gear ratio for an automatic manual transmission or an automatic transmission are disclosed. The traction resistance of a vehicle is calculated in order to determine the traction force required for maintaining, increasing, or decreasing vehicle speed in response to operator input. Traction resistance may be a function of rolling resistance, air resistance, and the component of the gravitational force acting parallel to the road surface. The change in traction resistance is also determined. The calculated traction resistance and change in traction resistance may advantageously be used to calculate an offset to a shift point motor speed in order to delay or advance a transmission upshift when climbing a grade.