| US 7,489,113 B2 | ||
| Energy storage system for a motor vehicle | ||
| Hartmut Proebstle, Augsburg (Germany); Thomas Christ, Auburn Hills, Mich. (US); Johannes von Grundherr, Munich (Germany); Marcus Hafkemeyer, Munich (Germany); and Michael Roesler, Pullach (Germany) | ||
| Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (Germany) | ||
| Filed on Jan. 19, 2007, as Appl. No. 11/655,139. | ||
| Claims priority of application No. 10 2006 002 985 (DE), filed on Jan. 21, 2006. | ||
| Prior Publication US 2007/0170896 A1, Jul. 26, 2007 | ||
| Int. Cl. H02P 9/00 (2006.01); H02P 11/00 (2006.01) | ||
| U.S. Cl. 322—17 [322/44; 322/37] | 14 Claims |
| 1. An energy storage system for a motor vehicle, comprising:
an electric machine configured for operation at least as a generator, for generating a generator current;
a vehicle electrical system battery connected in parallel to the electric machine;
a capacitor unit connected in parallel to the electric machine; and
a controller configured such that the battery is charged with a maximum battery charging current, if the vehicle is in a boost
or braking operating mode, and in all other operating modes, the battery is charged by a battery charging current that is
adjusted as a function of a state of charge of the battery, wherein
the controller is configured to adjust discharging of the battery such that a pre-defined minimum battery charging current
flows through the battery, if the state of charge of the battery exceeds a pre-defined first charge threshold value;
the controller is configured to adjust charging of the battery such that a pre-defined maximum battery charging current flows
through the battery, if the state of charge of the battery falls below a pre-defined second charge threshold value; and
the controller is configured to regulate the generator current such that a predetermined minimum charging current flows through
the battery, if the state of charge of the battery is equivalent to a predetermined state of charge.
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