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. 24, 2015
Filed:
Jul. 24, 2013
GM Global Technology Operations Llc, Detroit, MI (US);
Kristopher J. Kokko, Novi, MI (US);
Dara Monajemi, Lansing, MI (US);
David C. Webert, Livonia, MI (US);
Amanda P. Igel, Howell, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A vehicle transmission includes a plurality of oncoming clutches that are hydraulically-actuated. A controller is operatively connected to the plurality of oncoming clutches. An algorithm stored on and executable by the controller causes the controller to determine if at least one predefined coast condition is met and identify the plurality of oncoming clutches configured to be engageable during a downshift event from an initial gear ratio to respective other gear ratios. The initial gear ratio is greater than each of the respective other gear ratios. The algorithm causes the controller to generate a first pressure command to at least partially pressurize a first one of the oncoming clutches to a first staging pressure (P) if the at least one predefined coast condition is met prior to the downshift event. The first staging pressure (PS) is defined as a first return spring pressure (P) minus a first variable correction factor (CF).