On-Board Electrical System, and Method for Operating an On-Board Electrical System

Patent metadata

Field	Value
Publication number	US-2016339795-A1
Application number	US-201515114524-A
Country	US
Kind code	A1
Filing date	Jan 23, 2015
Priority date	Jan 27, 2014
Publication date	Nov 24, 2016
Grant date	—

Abstract

An on-board electrical system for a motor vehicle is disclosed. The on-board electrical system has a low-voltage subsystem for at least one low-voltage load, and has a high-voltage subsystem for at least one high-voltage load, and has a starter generator, wherein the high-voltage subsystem is connected to the low-voltage subsystem by means of a coupling unit, wherein the on-board electrical system has a battery which has at least two battery units having individual voltage taps which are routed to the coupling unit. In this case, the coupling unit is designed such that, in a first operating state, the high-voltage subsystem is fed from all of the battery units and the low-voltage subsystem is fed from one battery unit, and, in a second operating state, the high-voltage subsystem is fed from one battery unit and the low-voltage subsystem is fed from at least one battery unit.

First claim

1 . An onboard electrical system for a motor vehicle, the onboard electrical system comprising:
a low voltage subsystem for at least one low voltage load configured to operate with a low voltage; a high voltage subsystem for at least one high voltage load configured to operate with a high voltage; a starter generator; a coupling unit configured to connect the high voltage subsystem to the low voltage subsystem, the coupling unit being configured to provide at least a first operating state and a second operating state; and a battery configured to produce the high voltage and to supply the high voltage to the high voltage subsystem, the battery including at least two battery units having individual voltage taps that are routed to the coupling unit, wherein in the first operating state, the high voltage subsystem is fed from all battery units of the battery and the low voltage subsystem is fed from one battery unit of the battery, and in the second operating state, the high voltage subsystem is fed from one battery unit of the battery and the low voltage subsystem is fed from at least one battery unit of the battery.

2 . The onboard electrical system as claimed in claim 1 , wherein the battery units are each configured to provide the low voltage.

3 . The onboard electrical system as claimed in claim 1 , wherein the coupling unit includes at least one of switches with reverse blocking capability and switches with forward blocking capability.

4 . The onboard electrical system as claimed in claim 1 , wherein in the second operating state, the at least two battery units of the battery are connected in parallel with one another for the low voltage subsystem.

5 . The onboard electrical system as claimed in claim 1 , wherein in the first operating state, the at least two battery units of the battery are connected in series for the high voltage subsystem.

6 . The onboard electrical system as claimed in claim 1 , wherein the coupling unit is configured to provide at least one further operating state, wherein in the further operating state, the high voltage subsystem is fed from multiple battery units of the battery and the low voltage subsystem is fed from multiple parallel-connected battery units of the battery.

7 . A motor vehicle comprising:
an internal combustion engine; and an onboard electrical system, the onboard electrical system comprising:
a low voltage subsystem for at least one low voltage load configured to operate with a low voltage;
a high voltage subsystem for at least one high voltage load configured to operate with a high voltage;
a starter generator;
a coupling unit configured to connect the high voltage subsystem to the low voltage subsystem, the coupling unit being configured to provide at least a first operating state and a second operating state; and
a battery configured to produce the high voltage and to supply the high voltage to the high voltage subsystem, the battery including at least two battery units having individual voltage taps that are routed to the coupling unit,
wherein in the first operating state, the high voltage subsystem is fed from all battery units of the battery and the low voltage subsystem is fed from one battery unit of the battery, and in the second operating state, the high voltage subsystem is fed from one battery unit of the battery and the low voltage subsystem is fed from at least one battery unit of the battery.

8 . A method for operating an onboard electrical system, the onboard electrical system including (i) a low voltage subsystem for at least one low voltage load configured to operate with a low voltage, (ii) a high voltage subsystem for at least one high voltage load configured to operate with a high voltage, (iii) a starter generator, (iv) a coupling unit configured to connect the high voltage subsystem to the low voltage subsystem, and (v) a battery configured to produce the high voltage and to supply the high voltage to the high voltage subsystem, the battery including at least two battery units having individual voltage taps that are routed to the coupling unit, the method comprising:
controlling the coupling unit to provide one of a first operating state or a second operating state based on an operating phase of the motor vehicle, wherein in the first operating state, the high voltage subsystem is fed from all battery units of the battery and the low voltage subsystem is fed from one battery unit of the battery, and in the second operating state, the high voltage subsystem is fed from one battery unit of the battery and the low voltage subsystem is fed from at least one battery unit of the battery.

9 . The method as claimed in claim 8 , wherein at least one of:
a first operating phase of the motor vehicle is at least one of a switched-off vehicle and parked vehicle, a second operating phase of the motor vehicle is a motor vehicle start; a third operating phase of the motor vehicle is a start/stop mode of the motor vehicle; and a fourth operating phase of the motor vehicle is a driving mode of the motor vehicle.

10 . The method as claimed in claim 8 , further comprising:
supplying, in the first operating state, the low voltage subsystem with power from that battery unit of the battery that has a highest state of charge.

Assignees

• Bosch Gmbh Robert
• Samsung Sdi Co Ltd

Inventors

• Fink Holger

Classifications

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H02J7/575

  Parallel/serial switching of connection of batteries to charge or load circuit · 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

• B60L2260/22

  Standstill, e.g. zero speed · CPC title

• B60W10/26

  for electrical energy, e.g. batteries or capacitors · CPC title