Electrical system for motor vehicles

Details Electrical system for motor vehicles Electrical system for motor vehicles

1999-08-23

2001-10-16

Wong, Peter S. (Department: 2838)

Electricity: battery or capacitor charging or discharging

One cell or battery charges another

Vehicle battery charging

C307S010100

Reexamination Certificate

active

06304054

ABSTRACT:

TECHNICAL DOMAIN
The present invention relates to an electrical system with double batteries, particularly for motor vehicles.
STATE OF THE ART
A practice known from, for example, DE 40 28 242 A1 is the use of double batteries in an electrical system for motor vehicles. In such cases, the starting battery and the starter motor form a starting battery side, while the generator, consumer battery and other consumers form a consumer battery side. A problem with this type of electrical system is that of simply and safely separating the two battery sides so that the starting battery is always kept well charged. Another problem with known solutions is that they often use relays which, like cables and contact devices, have to be amply dimensioned in order to cope with the currents which occur during charging.
OBJECT OF THE INVENTION
The invention has the object of providing an electrical system which constitutes a simple, inexpensive and reliable solution for separating the two batteries. A further object is to ensure that the starting battery is kept as well charged as possible.
SUMMARY OF THE INVENTION
The object of the invention is achieved by executing the aforeside electrical system by providing a charging regulator.
The chosen location of the charging regulator creates a simple separation of the batteries, while current regulation to the starting battery creates the possibility of moderate charging currents which permit relatively thin conductors and connections.
Further providing the charging regulator with transistors of a special type creates the possibility of safe supply of current from each battery to an engine control unit which is essential for the operation of the engine.


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