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:
Jul. 07, 2020
Filed:
Jun. 11, 2018
Ford Global Technologies, Llc, Dearborn, MI (US);
Scott Joseph Gittins, Ann Arbor, MI (US);
Lisa Waldock, Livonia, MI (US);
Stephen Michael Cicala, Dearborn Heights, MI (US);
Joseph Scott Slayton, Macomb Township, MI (US);
Derek Kinch, Ypsilanti, MI (US);
Timothy Fedullo, Northville, MI (US);
Bradley D. Riedle, Northville, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
A transmission includes an accumulator to hold one of more shift elements in an engaged state while an engine is off. The transmission also includes a hydraulic park system that disengages park in response to engagement of two shift elements. In some circumstance, draining the accumulator in an uncontrolled manner in the presence of a failed valve may lead to unintentionally disengaging park. To avoid this, the accumulator is discharged in a controlled manner. Fluid is first transferred from the accumulator to a shift element apply chamber. Then, the fluid is vented from the shift element apply chamber.