US 6,982,540 B2
Energy management system for a motor vehicle electrical system
Gerolf Richter, Hildesheim (Germany); and Christian Rosenkranz, Wunstorf (Germany)
Assigned to VB Autobatterie GmbH, Hannover (Germany)
Filed on May 03, 2002, as Appl. No. 10/138,198.
Claims priority of application No. 101 21 962 (DE), filed on May 05, 2001.
Prior Publication US 2002/0171392 A1, Nov. 21, 2002
Int. Cl. H02J 7/00 (2006.01)
U.S. Cl. 320—104 15 Claims
OG exemplary drawing
 
1. An energy management system for an electrical system of a motor vehicle subjected to a large number of loads, comprising:
at least one generator;
at least one storage battery; and
a controller of energy distribution in the, system which bases such control at least on efficiency of individual components of the motor vehicle involved in power generation, energy storage and power consumption;
wherein during selected instants of operation of the motor vehicle, two efficiency chains determined from products of (a) current individual efficiencies for an internal combustion engine in the motor vehicle in combination with the generator driven by the internal combustion engine, and (b) the generator driven by braking energy in combination with the electric store, are compared by the controller.