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:
Jul. 07, 2009
Filed:
Oct. 26, 2006
Jy-jen F. Sah, West Bloomfield, MI (US);
Aniket Kothari, Southfield, MI (US);
Bryan R. Snyder, Waterford, MI (US);
Michael D. Foster, Carmel, IN (US);
Jy-Jen F. Sah, West Bloomfield, MI (US);
Aniket Kothari, Southfield, MI (US);
Bryan R. Snyder, Waterford, MI (US);
Michael D. Foster, Carmel, IN (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A method and an apparatus for controlling an electro-mechanical transmission selectively operative in a plurality of fixed gear modes and continuously variable modes is provided. The exemplary transmission comprises first and second electrical machines and a hydraulic circuit comprising a plurality of pressure control devices and flow management valves. The method comprises monitoring an operating temperature of the electrical machines. A cooling flow rate in the hydraulic circuit effective to reduce the operating temperature of the electrical machines is determined. Availability of active cooling for each of the electrical machines is determined. Hydraulic flow in the hydraulic circuit is selectively controlled.