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:
Nov. 15, 2011
Filed:
Apr. 22, 2009
Micheal P. Portell, Ann Arbor, MI (US);
Daryl A. Wilton, Macomb, MI (US);
Carlos E. Marin, Oxford, MI (US);
Leonid Basin, Farmington Hills, MI (US);
Ajit S. Grewal, Canton, MI (US);
Micheal P. Portell, Ann Arbor, MI (US);
Daryl A. Wilton, Macomb, MI (US);
Carlos E. Marin, Oxford, MI (US);
Leonid Basin, Farmington Hills, MI (US);
Ajit S. Grewal, Canton, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A vehicle powertrain includes an engine capable of being selectively turned on and turned off, a transmission operatively connected to the engine, and a hydraulic control system including a pump in fluid communication with the transmission. The pump is operatively connected to the engine for supplying fluid to the transmission when the engine is on, wherein the pump is idle when the engine is off. The hydraulic control system additionally includes an accumulator arranged to accumulate the fluid when the engine is on. The accumulator is also controlled to accumulate fluid when the engine is on, to retain the fluid when the engine is turned off, and to discharge the fluid to the transmission when the engine is restarted.