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:
Sep. 10, 2013
Filed:
Nov. 07, 2011
Jinming Liu, Saginaw, MI (US);
Lan Wang, Troy, MI (US);
Shannon E. Reeves, Milford, MI (US);
Jy-jen F. Sah, West Bloomfield, MI (US);
Jinming Liu, Saginaw, MI (US);
Lan Wang, Troy, MI (US);
Shannon E. Reeves, Milford, MI (US);
Jy-Jen F. Sah, West Bloomfield, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A hybrid electric vehicle has a controller, an engine, a traction motor, and a transmission. The controller is configured for calculating, using a costing function, the total system losses incurred at each operating point of the HEV, including the losses for each of the engine, the traction motor, and the transmission. The controller selectively modifies the calculated cost of at least one of the engine, the traction motor, and the transmission in a designated one of the transmission states as a function of transmission fluid temperature. An optimal transmission state is then selected as the state having the optimal cost relative to the other transmission states. Selectively modifying the calculated cost may include penalizing the cost of using designated transmission states when the measured fluid temperature exceeds certain calibrated temperature limits. Designated operating states may be disabled above an upper temperature limit to protect the transmission from overheating.