| US 7,545,109 B2 | ||
| Method and apparatus for monitoring an electrical energy storage device | ||
| Mutasim A. Salman, Rochester Hills, Mich. (US); Nick S. Kapsokavathis, Shelby Township, Mich. (US); Xiaodong Zhang, Madison Heights, Mich. (US); David W. Walters, Sterling Heights, Mich. (US); and Xidong Tang, Sterling Heights, Mich. (US) | ||
| Assigned to GM Global Technology Operations, Inc., Detroit, Mich. (US) | ||
| Filed on Apr. 17, 2007, as Appl. No. 11/736,151. | ||
| Claims priority of provisional application 60/871458, filed on Dec. 22, 2006. | ||
| Prior Publication US 2008/0150457 A1, Jun. 26, 2008 | ||
| Int. Cl. H02P 1/00 (2006.01) | ||
| U.S. Cl. 318—139 [388/806] | 20 Claims |
| 1. Method for monitoring an electrical energy storage device adapted to transfer electric energy to drive an electric motor,
comprising:
determining a state of charge and a temperature of the electrical energy storage device subsequent to a stabilization period;
selectively actuating the electric motor;
measuring a minimum voltage output from the electrical energy storage device during the selective actuation of the electric
motor;
determining a threshold voltage state based upon the state of charge and the temperature of the electrical energy storage
device; and,
determining a remaining useful life of the electrical energy storage device based upon the minimum voltage and the threshold
voltage state.
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