Motor vehicle electrical system having an electrical machine functioning as an on-board power supply generator

US5539286A · kind A · utility

Assignee

• Mercedes-Benz Group AG · DE

Inventors

• Horst Brinkmeyer · Waiblingen, DE
• Wolf-Dieter Blauensteiner · Bad Liebenzell, DE
• Thomas Binder · Wulfen, DE
• Gunter Loose · Waiblingen, DE
• Alfred Wirth · Schweinfurt, DE
• Gerhard Muenkel · Fellbach, DE
• Reinhard Steinkaemper · Winnenden, DE

Key dates

• Filing date: Oct 20, 1994
• Grant date: Jul 23, 1996
• Expiry date: Oct 20, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A motor vehicle electrical system has an electrical machine with an on-board power supply generator function. The electrical machine can be operated, in a first mode, as an on-board power supply generator, having a regulator for setting the excitation current for the electrical machine, and having an electrical load having a comparatively high power consumption, for example a heating device for an exhaust gas catalytic converter. A changeover switch, by means of which an output of the electrical machine can optionally be connected to an on-board power supply cable or to the load, as well as a control unit for controlling the regulator and changeover switch optionally in the first mode or a second mode, is provided so that the electrical machine is connected to the on-board power supply and the regulator regulates the operating voltage at an on-board power supply voltage. Alternatively, the electrical machine is connected to the load and the regulator regulates the operating voltage at a higher nominal value. In addition to these two functions, a third function as a starter motor is provided for the electrical machine.