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:
Jul. 25, 2008
Vijay A. Neelakantan, Rochester Hills, MI (US);
John C. Schultz, Saline, MI (US);
Bret M. Olson, Canton, MI (US);
Hamid Vahabzadeh, Oakland, MI (US);
Robert L. Moses, Ann Arbor, MI (US);
Vijay A. Neelakantan, Rochester Hills, MI (US);
John C. Schultz, Saline, MI (US);
Bret M. Olson, Canton, MI (US);
Hamid Vahabzadeh, Oakland, MI (US);
Robert L. Moses, Ann Arbor, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A hydraulic control system for actuating a torque transmitting device in a transmission includes a sump for receiving a hydraulic fluid and a piezoelectric pump for pumping the hydraulic fluid from the sump to the torque transmitting device. A first fluid flow path communicates the hydraulic fluid from the sump to the piezoelectric pump and a second fluid flow path communicates the hydraulic fluid from the piezoelectric pump to the torque transmitting device. An exhaust means selectively communicates the hydraulic fluid from the torque transmitting device to the sump.