Device for supplying voltage in a motor vehicle including two batteries and having improved reliability

US5977652A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wunibald Frey · Schwieberdingen, DE
• Hans Gegusch-Brunner · Ettlingen, DE
• Joachim Schenk · Hemmingen, DE
• Volker Breunig · Neckarsulm, DE
• Richard Schoettle · Maulbronn, DE
• Bernd Aupperle · Steinheim, DE

Key dates

• Filing date: Jan 12, 1998
• Grant date: Nov 2, 1999
• Expiry date: Jan 12, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/70
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

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.