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:
May. 05, 2015
Filed:
Oct. 14, 2011
Tami A. Curtis, South Lyon, MI (US);
Michael L. Duhaime, Northville, MI (US);
Anthony P. Tata, Fenton, MI (US);
Peter Donald Bock, Commerce Township, MI (US);
Tami A. Curtis, South Lyon, MI (US);
Michael L. Duhaime, Northville, MI (US);
Anthony P. Tata, Fenton, MI (US);
Peter Donald Bock, Commerce Township, MI (US);
GM Global Technology Operations, LLC, Detroit, MI (US);
Abstract
An active/passive system for managing the temperature of fluid within an automatic transmission includes two heat exchangers, an active solenoid valve and a passive wax motor valve. A first heat exchanger provides transmission fluid heating and receives a flow of engine coolant. A second heat exchanger provides transmission fluid cooling and is exposed to ambient air. The solenoid valve which is preferably driven by a signal from a transmission control module (TCM) and the wax motor valve cooperate to provide three states of operation: transmission fluid heating, that is, heat added, cooling, that is, heat removed and pass-through or bypass (without heating or cooling).