Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1993-07-02
1996-06-11
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 16, H01M 1044
Patent
active
055258913
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a power supply device in a motor vehicle.
Formerly, the power supply in a motor vehicle was achieved in most cases with a single battery charged by a generator. In modern motor vehicles with a plurality of electrical consumers one battery is sometimes no longer sufficient for the power supply so that two separate batteries which are connected either in series or in parallel must be used.
Since most of the electrical consumers in the motor vehicle require a supply voltage adjusted to a constant value, supply problems occur particularly during the starting process. This is because the starter has a low internal resistance and therefore overloads the vehicle supply system by a high current of more than 100 amperes so that the vehicle supply voltage drops during the starting process to a value at which e.g. the ignition or the injection no longer functions perfectly.
To avoid this problem in a vehicle supply system for a motor vehicle known from DE-OS 38 12 577, the starter is connected to a battery, while the sensitive consumers requiring constant voltage are connected to another battery. The two batteries can be supplied with voltage optionally by one or two separate generators.
However, the known vehicle supply system for a motor vehicle has the disadvantage that the connection between the two batteries cannot be interrupted when starting so that a drop in voltage at the battery connected with the starter can affect the rest of the vehicle supply system.
A further disadvantage of the known vehicle supply system consists in that the nominal voltage of the battery connected with the starter is higher than the nominal voltage of the other battery so that a discharged starter battery cannot easily be recharged by the other battery.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a power supply device in a motor vehicle, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a power supply device for a motor vehicle with a first voltage storage for supplying the motor vehicle supply system and a second voltage storage which is connected with the first voltage storage and with which the starter can be connected, and at least one generator for charging the voltage storages, wherein in accordance with the present invention the voltage storages are connected with one another and with the generator or generators via a charging/separating module which interrupts the connection between the voltage storage and between at least one of the voltage storages and at least one generator as a function of parameters which can be predetermined.
When the power supply device is designed in accordance with the present invention, it has the advantage over the prior art that two voltage storages are provided, e.g. the normal battery for the vehicle supply system and a so-called starter storage for supplying the starter, and the starter as well as the respective voltage storage are separated from the rest of the vehicle supply system and from the first voltage storage during the starting process via a charging/separating module so that the voltage drop caused by the starter has no effect on the remaining vehicle supply system voltage.
When the nominal voltage of the second voltage storage associated with the starter is selected lower than the nominal voltage of the first voltage storage, the second voltage storage which is extensively discharged after repeated attempts at starting the vehicle can easily be recharged from the first voltage storage via the charging/separating module.
Since a number of vehicle supply system parameters or measurement variables are supplied to the charging/separating module, this charging/separating module can automatically switch over or switch off as a function of predetermined parameters.
When a step-up transformer is associated with the charging/separatin
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Doege Mathias
Frey Wunibald
Meyer Friedhelm
Law Patrick B.
Robert & Bosch GmbH
Striker Michael J.
Wong Peter S.
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