Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1998-01-12
1999-11-02
Paladini, Albert W.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
307 44, 307 64, 307 66, 320104, 340455, H02J 110
Patent
active
059776528
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. To assure starting two separate batteries are used that are typically connected in parallel to one another. To assure that the two batteries are not cyclized at the same time and thus to prevent voltage drops that can occur during actuation of the starter at voltage-critical components, a charging/disconnection module is connected between the two batteries. This charging/disconnection device is provided in a device for voltage supply in a motor vehicle described in German Patent 41 38 943. During the starting process this module disconnects the battery associated with the starter from the rest of the on-board electrical system. Since the rated voltage of the battery assigned 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.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved circuit device for supplying voltage in a motor vehicle including two batteries and having improved reliability for vehicle operation even when both of the batteries are in a poorly charged state.
According to the invention the device for supplying voltage in a motor vehicle includes first battery connected electrically with the generator and at least one consumer connected electrically with the generator and the first battery; electrically with the starter; of the motor vehicle including a voltage regulator connected electrically with the supply circuit means for regulation of the output voltage of the generator; terminal electrically connected to the starting circuit, at least one other terminal electrically connected to the supply circuit and at least one further terminal for electrical connection of the operations-relevant electrical components with the supply circuit or the starting circuit; and an on-board electrical system module including means for reverse switching between the terminals for electrically connecting and disconnecting the starting circuit and the second battery to the generator and the first battery of the supply circuit via the at least one terminal electrically connected to the starting circuit and the at least one other terminal electrically connected to the supply circuit and for electrically connecting and disconnecting the operations-relevant components with the supply circuit or the starting circuit via the at least one further terminal; and means for controlling the means for reverse switching between the terminals, preferably a microprocessor, so that the operations-relevant components are supplied with electrical power at a highest priority in relation to a supply of the at least one consumer for emergency operation of the motor vehicle when both batteries are in a substantially discharged or poorly charged state.
The device according to the invention for the voltage supply in a motor vehicle has the advantage that even when the batteries are in a poorly charged state it is assured that the vehicle can still be operated for a certain length of time, one that for instance suffices to drive to the next repair facility. This advantage is attained by employing an on-board electrical system control unit, which performs the connection and disconnection function between the two batteries and has one additional terminal by way of which the voltage supply can be assured for those electrical or electronic components that are absolutely necessary for vehicle operation. This additional terminal is supplied with voltage at maximum priority, with the aid of an advanta
REFERENCES:
patent: 5525891 (1996-06-01), Meyer et al.
Aupperle Bernd
Breunig Volker
Frey Wunibald
Gegusch-Brunner Hans
Schenk Joachim
Bosch GmbH Robert
Paladini Albert W.
Striker Michael J.
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