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:
Jun. 27, 2017
Filed:
Dec. 15, 2014
GM Global Technology Operations Llc, Detroit, MI (US);
Vijay A. Neelakantan, Rochester Hills, MI (US);
Joshua McDonough, Novi, MI (US);
Matthew R. Knoth, Indianapolis, IN (US);
Philip C Lundberg, Keego Harbor, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A hydraulic control system for a transmission includes a source of pressurized hydraulic fluid, a park servo connected to a park mechanism, the park servo having a park side, an out-of-park side, and a biasing member disposed on the park side. A first valve assembly includes a first inlet port in fluid communication with the source of pressurized hydraulic fluid, a first outlet port, and a first valve for selectively allowing fluid communication between the first inlet port and the first outlet port. A second valve assembly includes a second inlet port in direct fluid communication downstream of the first valve assembly, a second outlet port in direct fluid communication with the out-of-park side of the park servo, and a second valve moveable between an out-of-park position and a park position.