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:
Jan. 06, 2009
Filed:
May. 25, 2006
Norman K. Bucknor, Troy, MI (US);
Tejinder Singh, Canton, MI (US);
John A. Diemer, Farmington Hills, MI (US);
Alan G. Holmes, Clarkston, MI (US);
James D. Hendrickson, Belleville, MI (US);
Joshua E. Lehrmann, Ann Arbor, MI (US);
Madhusudan Raghavan, West Bloomfield, MI (US);
Norman K. Bucknor, Troy, MI (US);
Tejinder Singh, Canton, MI (US);
John A. Diemer, Farmington Hills, MI (US);
Alan G. Holmes, Clarkston, MI (US);
James D. Hendrickson, Belleville, MI (US);
Joshua E. Lehrmann, Ann Arbor, MI (US);
Madhusudan Raghavan, West Bloomfield, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
An electrically variable transmission family is provided which has low-content, low-cost electrically variable transmission mechanisms including first and second differential gear sets, a battery, two electric machines serving interchangeably as motors or generators, up to six selectable torque-transfer devices and possibly a dog clutch. The selectable torque transmitting devices are engaged to yield an EVT with a continuously variable range of speeds (including reverse) and at least four mechanically fixed forward speed ratios. The torque transmitting devices and the first and second motor/generators are operable to provide five operating modes in the electrically variable transmission, including battery reverse mode, EVT reverse mode, reverse and forward launch modes, continuously variable transmission range mode, and fixed ratio mode.