Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1998-01-12
1999-05-25
Elms, Richard T.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
307 106, 180 651, 320104, 36452821, B60L 2200
Patent
active
059071940
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for the voltage supply in a motor vehicle and, more particularly, to a device for supplying voltage in a motor vehicle having two batteries.
2. Prior Art
Until now, the voltage supply in motor vehicles was typically done with the aid of a single battery charged by a generator. In modern motor vehicles with many electrical consumers, one battery is sometimes no longer sufficient for the voltage supply, and so two separate batteries are used that typically connected parallel to one another. To assure that the two batteries will not deleteriously affect one another, and thus to keep voltage drops that can occur during actuation of the starter away from voltage-critical components, a charging/disconnection module is connected between the two batteries, in a device for the voltage supply in a motor vehicle known from German Patent 41 38 943. During the starting process this module disconnects the battery connected with the starter from the rest of the on-board electrical system. Since the rated voltage of the battery connected to the starter is somewhat lower than the rated voltage of the on-board electrical system battery, it is assured that the starter battery will be optimally charged at all times. In one embodiment of the known device for the voltage supply in a motor vehicle, a voltage converter be used, for example a stepup device. It is thus possible to use a starter battery whose rated voltage is higher than that of the on-board electrical system battery. The charging voltage required for charging the starter battery can be obtained by increasing the voltage obtained from the on-board voltage.
SUMMARY OF THE INVENTION
The device for supplying voltage in a motor vehicle comprises: generator-speed dependent output voltage without voltage regulation; voltage regulation to produce the at least one generator speed dependent output voltage including controlled rectifier bridge means connected to the at least one generator, an intermediate voltage circuit connected to the controlled rectifier bridge means, means for controlling the at least one generator, the controlled rectifier bridge means and the intermediate voltage circuit and a plurality of terminals by means of which the at least two batteries are connected with the electrical consumers to supply the electrical consumers with electrical power and by means of which at least one of the at least two batteries is connected to the electrically powered starter to supply the starter with electrical power during a starting process.
The device for supplying voltage to a motor vehicle according to the invention has the advantage that an especially powerful yet reliable and safe voltage supply is made possible for the consumers of an on-board vehicle electrical system. This advantage is attained by operating at least one generator in such a way that it furnishes an rpm-dependent or rpm-independent output voltage. This rpm-dependent output voltage is adapted with the aid of an electronic power control system to the requirements of the on-board electrical system, and this adaptation can be optimized such that the components to be supplied are each supplied with what is the optimally adapted voltage for them. Via the electronic power control system, an optimal power adaptation with regard to a maximum energy yield can be attained in the generator by impedance adaptation.
Further advantages of the invention are attained by the provisions recited in the dependent claims. One of these advantageous provisions is to vary the number of active generator windings by switching the windings or the winding connections and thus to achieve an additional generator adaptation. In a two-battery on-board electrical system with an intermediate circuit and a supply circuit that are each at the same voltage level, the voltages can advantageously be made available to the consumers in the power control unit directly without conversion, that is, without losses, so that an optimal-efficiency distrib
REFERENCES:
patent: 5525891 (1996-06-01), Meyer et al.
Schenk Joachim
Schoettle Richard
Schramm Dieter
Elms Richard T.
Kaplan Jonathan S.
Robert & Bosch GmbH
Striker Michael J.
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