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:
Oct. 18, 2011
Filed:
Sep. 27, 2007
Charles F. Long, Pittsboro, IN (US);
Phillip F. Mccauley, Zionsville, IN (US);
Jeffrey J. Cole, Plainfield, IN (US);
Charles F. Long, Pittsboro, IN (US);
Phillip F. McCauley, Zionsville, IN (US);
Jeffrey J. Cole, Plainfield, IN (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A control system is provided for selectively actuating a dual area apply piston having first and second piston areas each selectively biased by hydraulic pressure within a respective first and second fill cavities. The control system includes a pressure regulator valve, a dual area activation valve, and a solenoid valve operable to selectively and variable operate the pressure regulator valve to effect biasing of the first and second piston areas by communicating hydraulic pressure to the first fill cavity and/or the second fill cavity.