Method for checking a connection between a low-voltage supply system and a battery, and motor vehicle

US9933472B2 · kind B2 · utility

Assignee

• AUDI AG · DE

Inventors

• Karsten Barth · Bochum, DE
• Rolf Naumann · Krefeld, DE
• Thomas Hackner · Greding, DE

Key dates

• Filing date: Feb 5, 2015
• Grant date: Apr 3, 2018
• Expiry date: Feb 5, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/70
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A process to check a connection between a battery (2) supplying a low-voltage network (1) of a motor vehicle (12), the voltage of which is less than the voltage of a high-voltage network (6) of the motor vehicle (12), and the low-voltage network (1); wherein a DC voltage converter (5), which is configured for exchanging electrical power between the high-voltage network (6) and the low-voltage network (1), connects the high-voltage network (6) to the low-voltage network (1); wherein a DC voltage converter (5) modulates the output voltage into the low-voltage network at a modulation frequency; wherein the current hereby applied and the voltage hereby applied are measured by the battery (2), and a resistance value is determined and evaluated with respect to at least one connection criterion, according to which a connection fault is determined when at least one connection criterion is not fulfilled.