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. 23, 2018
Filed:
Aug. 30, 2016
GM Global Technology Operations Llc, Detroit, MI (US);
Peter J. Giles, Ypsilanti, MI (US);
Shaun D. Hoffman, West Bloomfield, MI (US);
Anthony Capobianco, Bloomfield Hills, MI (US);
GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US);
Abstract
A method for shifting between a low speed range and a high speed range for a two-speed transfer case in a four-wheel drive vehicle includes determining a target transmission gear ratio and a desired transfer case range based on the current vehicle speed and the initial transfer case range. The transmission is shifted to the target transmission gear ratio when it is determined that the vehicle speed is in an appropriate range. The transfer case input torque is reduced to a minimum value, and the transfer case is shifted to neutral. The method further includes adjusting the engine speed and transmission gear setting to control the transmission output shaft speed to a desired range. The transfer case is shifted from neutral to the desired transfer case range when the transmission output shaft speed is within the desired range of transmission output shaft speed.