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. 08, 2006
Filed:
Sep. 12, 2003
Joseph Slayton, Macomb Township, MI (US);
Bradley Riedle, Northville, MI (US);
Pramod Jain, Farmington Hills, MI (US);
Balaram Sankpal, Canton, MI (US);
Steven Meisner, Dexter, MI (US);
David Bidner, Livonia, MI (US);
Armand Giannamore, Farmington Hills, MI (US);
Joseph Slayton, Macomb Township, MI (US);
Bradley Riedle, Northville, MI (US);
Pramod Jain, Farmington Hills, MI (US);
Balaram Sankpal, Canton, MI (US);
Steven Meisner, Dexter, MI (US);
David Bidner, Livonia, MI (US);
Armand Giannamore, Farmington Hills, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
An automatic transmission ratio shift control system and method for a powertrain having an engine and multiple-ratio gearing controlled by friction elements actuated by hydraulic pressure, an electronic controller for establishing torque transitions among the friction elements as the gear ratio changes, the engine speed being controlled by an electronic throttle control. The strategy employs an electronic throttle and closed loop engine speed control and uses fuel and air as an energy source to increase engine speed during a power-off downshift. The engine speed is boosted to a level close to the synchronous speed in conjunction with release of the off-going friction element. The on-coming friction element is then applied as the engine speed approaches a desired speed. The engine speed increase is timed to lead an increase in torque converter speed.