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. 29, 2013
Filed:
Sep. 28, 2009
Kazuaki Nakamura, Toyota, JP;
Toshimitsu Sato, Toyota, JP;
Kazuaki Nakamura, Toyota, JP;
Toshimitsu Sato, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
In one embodiment, a hydraulic pressure control circuit () of an automatic transmission includes a mechanical oil pump (MOP) and an electrical oil pump (EOP). The discharge side of the electrical oil pump (EOP) is caused to be in communication with the direct upstream side of a hydraulic pressure servo of a first clutch (C) via a shunt hydraulic pressure supply passage (). At the time of idle reduction, a linear solenoid () on the upstream side of the first clutch (C) is caused to enter a forced closure state, thus preventing oil from the electrical oil pump (EOP) from flowing to a manual shift valve () side.