초록 ▼

A two-battery on-board electrical system in a motor vehicle is disclosed, in which an on-board electrical system control unit is disposed between the batteries, and one battery is used primarily to supply the usual consumers while the other is used primarily to supply the starter. The on-board elect

A two-battery on-board electrical system in a motor vehicle is disclosed, in which an on-board electrical system control unit is disposed between the batteries, and one battery is used primarily to supply the usual consumers while the other is used primarily to supply the starter. The on-board electrical system control unit 16 includes an on-board electrical system module, which performs the requisite reverse switching operations and has one further terminal, by on-board electrical system components required for starting an operation can be supplied with voltage. These on-board electrical system components are supplied at maximum priority, and if the supply battery is too greatly discharged are jointly supplied by both batteries, but it is nevertheless assured that during the starting process the other on-board electrical system components are not connected to the starter battery.

대표청구항 ▼

[ We claim:] [1.] A device for supplying voltage in a motor vehicle, said device comprisingsupply circuit means (10) including a generator (G) having an output voltage, a first battery (13) connected electrically with the generator (G), and at least one consumer (14,15) connected electrically with t

[ We claim:] [1.] A device for supplying voltage in a motor vehicle, said device comprisingsupply circuit means (10) including a generator (G) having an output voltage, a first battery (13) connected electrically with the generator (G), and at least one consumer (14,15) connected electrically with the generator and the first battery (13);starting circuit means (20) including a starter (S) and a second battery (18) connected electrically with the starter (S);operations-relevant electrical components (21) necessary for operation of the motor vehicle including a voltage regulator connected electrically with the supply circuit means (10) for regulation of the output voltage of the generator (G);control means (16) comprising a plurality of terminals (Kl.30, Kl.30a, Kl.30b; Kl.A, Kl.B, Kl.C) including at least one (Kl.30a, Kl.A)) of said terminals electrically connected to the starting circuit means (20), at least one other (Kl.30, Kl.B) of said terminals electrically connected to the supply circuit means (10) and at least one further one (Kl.30b, Kl.B) of said terminals for electrical connection of the operations-relevant electrical components (21) with the supply circuit means (10) or the starting circuit means (20); and an on-board electrical system module (22a-22f) including means (23, 24, 30) for reverse switching between said terminals to electrically connect and disconnect the starting circuit means (20) and the second battery (18) to said generator (G) and said first battery (13) of said supply circuit means (10) via said at least one (Kl30.A, Kl.A) of said terminals electrically connected to the starting circuit means (20) and said at least one other (Kl.30, Kl.B) of said terminals electrically connected to the supply circuit means (10) and for electrically connecting and disconnecting the operations-relevant components (21) with the supply circuit means (10) or with the starting circuit means (20) via the at least one further one of said terminals (Kl.30b, Kl.C); and means (25) for controlling the means for reverse switching between said terminals so that the operations-relevant components (21) are supplied with electrical power at a highest priority in relation to a supply of said at least one consumer (14,15) for emergency operation of the motor vehicle when both of said batteries (13,18) are in a substantially discharged or poorly charged state.