Method for operating an onboard network

Patent metadata

Field	Value
Publication number	US-9929574-B2
Application number	US-201514665925-A
Country	US
Kind code	B2
Filing date	Mar 23, 2015
Priority date	Sep 24, 2012
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

An electrical distribution system includes a first energy store and a second energy store. The two energy stores are connected in parallel. Characteristic values of the first and/or second energy store are detected and a regeneration phase of the first energy store is implemented depending on the detected characteristic values. In the regeneration phase, a first operating voltage is preset and provided by means of a generator in such a way that said first operating voltage contributes to the second energy store having, after a preset time span, a higher open-circuit voltage than the first energy store.

First claim

What is claimed is:

1. A method for operating an electrical distribution system having a first energy store and a second energy store, wherein the first and second energy stores are connected in parallel, wherein the method comprises the acts of:
detecting characteristic values of at least one of the first energy store and the second energy store; and
implementing a regeneration phase of the first energy store depending on said detected characteristic values, wherein in the regeneration phase a first operating voltage is preset and provided by a generator such that said first operating voltage contributes to the second energy store having, after a preset time span, a higher open-circuit voltage than the first energy store,
wherein once a preset state of charge of the second energy store has been reached, a second preset operating voltage is provided by the generator, where such second preset operating voltage contributes to the first energy store being charged and the second energy store approximately maintaining its state of charge.

2. The method as claimed in claim 1 , in which during the regeneration phase, characteristic values of the first energy store are monitored.

3. The method as claimed in claim 2 , wherein the electrical distribution system further comprises a switch by which the first energy store can be galvanically isolated from the second energy store.

4. The method as claimed in claim 1 , wherein the electrical distribution system further comprises a switch by which the first energy store can be galvanically isolated from the second energy store.

5. The method as claimed in claim 1 , wherein the first energy store has a lead-acid rechargeable battery.

6. The method as claimed in claim 1 , wherein the second energy store has a lithium-ion rechargeable battery.

7. The method as claimed in claim 1 , in which if there is no or still only a preset low charge flow between the first energy store and the second energy store, a check is performed, depending on the detected characteristic values, to ascertain whether the regeneration phase was successful.

8. A method for operating an electrical distribution system having a first energy store and a second energy store, wherein the first and second energy stores are connected in parallel, wherein the method comprises the acts of:
detecting characteristic values of at least one of the first energy store and the second energy store; and
implementing a regeneration phase of the first energy store depending on said detected characteristic values, wherein in the regeneration phase a first operating voltage is preset and provided by a generator such that said first operating voltage contributes to the second energy store having, after a preset time span, a higher open-circuit voltage than the first energy store,
wherein if there is no or still only a preset low charge flow between the first energy store and the second energy store, a check is performed, depending on the detected characteristic values, to ascertain whether the regeneration phase was successful.

9. The method as claimed in claim 8 , in which during the regeneration phase, characteristic values of the first energy store are monitored.

10. The method as claimed in claim 8 , wherein the electrical distribution system further comprises a switch by which the first energy store can be galvanically isolated from the second energy store.

11. The method as claimed in claim 8 , wherein the first energy store has a lead-acid rechargeable battery.

12. The method as claimed in claim 8 , wherein the second energy store has a lithium-ion rechargeable battery.

13. An apparatus for operating an electrical distribution system comprising:
a first energy store connected in parallel with a second energy store;
a program and data memory configured to store a program; and
an arithmetic logic unit connected to the program and data memory, wherein the arithmetic logic unit is configured to execute the program to:
detect characteristic values of at least one of the first energy store and the second energy store, and
implement a regeneration phase of the first energy store depending on said detected characteristic values, wherein in the regeneration phase a first operating voltage is preset and provided by a generator such that said first operating voltage contributes to the second energy store having, after a preset time span, a higher open-circuit voltage than the first energy store,

wherein once a preset state of charge of the second energy store has been reached, a second preset operating voltage is provided by the generator, where such second preset operating voltage contributes to the first energy store being charged and the second energy store approximately maintaining its state of charge.

14. The apparatus as claimed in claim 13 , in which during the regeneration phase, the arithmetic logic unit is further configured to execute the program to monitor characteristic values of the first energy store.

15. The apparatus as claimed in claim 13 , wherein the electrical distribution system further comprises a switch by which the first energy store can be galvanically isolated from the second energy store.

16. The apparatus as claimed in claim 13 , in which if there is no or still only a preset low charge flow between the first energy store and the second energy store, the arithmetic logic unit is further configured to execute the program to perform a check, depending on the detected characteristic values, to ascertain whether the regeneration phase was successful.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Schindler Moritz
• Schaeck Stefan

Classifications

• H02J2105/33

  exchanging power with road vehicles · CPC title

• H02J7/875

  Charging or discharging for charge maintenance, battery initiation or rejuvenation · CPC title

• H02J7/342

  The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging (with circuits for polarity protection H02J7/68) · CPC title

• H02J7/0054

  Electricity · mapped topic

• H02J7/0021 Primary

  Electricity · mapped topic