System for supplying voltage to electrical loads of a motor vehicle

US8324754B2 · kind B2 · utility

Assignee

• Bayerische Motoren Werke Aktiengesellschaft · DE

Inventors

• Andreas Broesse · Munich, DE
• Dieter Polenov · Munich, DE
• Hartmut Proebstle · Augsburg, DE
• Marcus Hafkemeyer · Jersey City, US

Key dates

• Filing date: Feb 3, 2009
• Grant date: Dec 4, 2012
• Expiry date: Apr 5, 2030

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 system is provided for supplying voltage to electrical loads in the onboard electrical system of a motor vehicle, in which system the onboard electrical system includes at least two onboard electrical system regions. The first onboard electrical system region has an electric generator, a vehicle battery, and one or more first electrical loads, and the second onboard electrical system region has a double-layer capacitor or a so-called supercap, and one or more second electrical loads. A blocking apparatus, in particular a semiconductor diode or a circuit breaker, is provided between the two onboard electrical system regions. The blocking apparatus permits current to flow from the first onboard electrical system region to the second onboard electrical system region and largely prevents current from flowing in reverse from the second onboard electrical system region to the first onboard electrical system region. The output voltage of the electrical generator is increased and the supercap is charged when a first threshold value of the electrical voltage is undershot in the second onboard electrical system region.