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:
Dec. 15, 2009
Filed:
Jun. 08, 2007
Hussein Dourra, Bloomfield, MI (US);
Javed A. Dada, Lapeer, MI (US);
Teddy Siy, Royal Oak, MI (US);
Ali Mourtada, Dearborn Heights, MI (US);
Hussein Dourra, Bloomfield, MI (US);
Javed A. Dada, Lapeer, MI (US);
Teddy Siy, Royal Oak, MI (US);
Ali Mourtada, Dearborn Heights, MI (US);
Chrysler Group LLC, Auburn Hills, MI (US);
Abstract
An automatic transmission for a vehicle includes a main box controlled using a series of clutches, and an underdrive assembly controlled using a series of clutches and at least one overrunning clutch. In achieving a double-swap downshift from a first transmission 'gear' employing a first main box clutch and a first underdrive assembly clutch, to a second transmission 'gear' employing a second main box clutch and a second underdrive assembly clutch, a controller delays release of the first main box clutch until after the second underdrive assembly clutch has been prefilled, and fully applies the second underdrive assembly clutch only after slip has been detected in both the main box and the underdrive assembly. Additionally, the controller fully applies the second main box clutch only after the second underdrive assembly clutch has itself been fully applied.