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:
Aug. 28, 2012
Filed:
Apr. 09, 2009
Yuji Fujii, Ann Arbor, MI (US);
Gregory Michael Pietron, Canton, MI (US);
Seung-hoon Lee, Northville, MI (US);
James William Loch Mccallum, Ann Arbor, MI (US);
Mohamed Redissi, Ann Arbor, MI (US);
David Popejoy, Clawson, MI (US);
John Butwin, Ann Arbor, MI (US);
Robert Orley Burkhart, Novi, MI (US);
Diana Yanakiev, Canton, MI (US);
Yuji Fujii, Ann Arbor, MI (US);
Gregory Michael Pietron, Canton, MI (US);
Seung-Hoon Lee, Northville, MI (US);
James William Loch McCallum, Ann Arbor, MI (US);
Mohamed Redissi, Ann Arbor, MI (US);
David Popejoy, Clawson, MI (US);
John Butwin, Ann Arbor, MI (US);
Robert Orley Burkhart, Novi, MI (US);
Diana Yanakiev, Canton, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
A closed loop shift control apparatus and method based on friction element load controls a torque transfer phase when shifting from a low gear configuration to a high gear configuration for an automatic transmission system. When pressure actuated friction elements are selectively engaged and released to establish torque flow paths in the transmission, measurements or estimates of torsional load exerted on the off-going friction element are used to predict the optimal off-going friction element release timing for achieving a consistent shift feel. The ideal timing to release the off-going friction element is uniquely defined when torque load exerted onto the off-going friction element becomes substantially zero. An on-coming clutch engagement process is controlled by a closed loop control based on measurements or estimates of on-coming clutch torque capacity for a constant shift feel under dynamically changing conditions.