Car power supply system

Details Car power supply system Car power supply system

1999-09-24

2001-03-13

Ponomarenko, Nicholas (Department: 2834)

Prime-mover dynamo plants

Plural prime mover

Plural prime movers with fluid interconnection

C322S007000

Reexamination Certificate

active

06201310

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a car power supply system comprising a plurality of generators.
2. Description of the Prior Art
FIG. 7
is a sectional view of a car AC generator of the prior art. This AC generator comprises a case
3
formed by connecting an aluminum front bracket
1
and an aluminum rear bracket
2
by a bolt
3
B, a generator shaft
5
provided in the case
3
and fitted with a pulley
4
for receiving the torque of an engine transmitted from a belt at one end, a randol type rotor
6
fixed to the generator shaft
5
, fans
6
F fixed to both side of the rotor
6
, a stator
7
A fixed on the inner wall of the case
3
, slip rings
8
, fixed to the other end of the generator shaft
5
, for supplying a current to the rotor
6
, a pair of brushes
9
and
9
which slide in contact with the slip rings
8
, a brush holder
10
for storing the brushes
9
and
9
, a rectifier
11
, electrically connected to the stator
7
A, for rectifying an AC generated in the stator
7
A into a DC, a heat sink
12
attached to the brush holder
10
, and a regulator
13
, attached to the heat sink
12
, for regulating an AC voltage generated in the stator
7
A. Denoted by
14
a
and
14
b
are bearings, and
15
brackets for connecting the AC generator to the engine.
The above rotor
6
comprises a rotor coil
6
A for generating a magnetic flux with a current supplied and a pole core
6
B for covering the rotor coil
6
A and forming a magnetic pole with the magnetic flux. The pole core
6
B consists of a pair of pole core unit
6
x
and a pole core unit
6
y
which engage with each other. The pole core units
6
x
and
6
y
are made from iron and have claw-like magnetic poles
62
and
62
, respectively.
The stator
7
A comprises a stator core
17
A and a stator coil
17
B formed of a conductor wound round the stator core
17
A. An AC is generated in the stator coil
17
B by the rotation of the rotor
6
according to changes in the magnetic flux from the rotor coil
6
A.
In the car AC generator constituted above, a current is supplied to the rotor coil
6
A from a battery (unshown) through the brushes
9
and
9
and the slip rings
8
to generate a magnetic flux. Meanwhile, the pulley
4
is driven by the engine and the rotor
6
is turned by the generator shaft
5
, thereby giving a rotating field to the stator coil
17
B to generate electromotive force in the stator coil
17
B. This AC electromotive force is rectified into a DC by the diodes
16
and
16
of the rectifier
11
, the DC is regulated by the regulator
13
, and the regulated DC is charged into the battery and supplied to electric loads.
FIG. 8
is a sectional view of a car brushless AC generator of the prior art. The same or corresponding elements as those of
FIG. 7
are given the same reference symbols and their descriptions are omitted. In the case of this car brushless AC generator, when the engine is started, an excitation current is supplied from the battery to an excitation coil incorporated in an excitation core
19
and the pole core units
6
x
and
6
y
of the rotor
6
are turned by the rotation of the generator shaft
5
, whereby electromotive force is generated in the stator coil
17
B of the stator
7
A. This AC electromotive force is rectified into a DC by the diodes
16
and
16
of the rectifier
11
, the DC is regulated by the regulator
13
A, and the regulated DC is charged into the battery and supplied to electric loads.
FIG. 9
is a diagram showing a car power supply system of the prior art comprising the generator shown in FIG.
7
and FIG.
8
.
The generator
20
for supplying power to the electric loads of a vehicle is connected to an engine E by the above brackets
15
and attachment arms
15
A. A belt
20
b
is stretched between the pulley
20
a
of the generator
20
and the pulley F
a
of the crank shaft F of the engine E.
When the engine E is started, an excitation current is supplied to the rotor coil
6
A of the generator
20
and the generator shaft
5
is turned by the belt
20
b
for transmitting the torque of the engine E to start the power generation of the generator
20
.
SUMMARY OF THE INVENTION
Since the output of the generator is determined by the size (D
2
(outer diameter of rotor) L (length of stator)) of the generator, a large-sized generator is required to obtain high output for a large-capacity electric load.
However, when a large-sized generator is used, the installation freedom of the engine is small and there is a good possibility that the generator may crash into the cabin at the time of a car crash. That is, there has been problems with the installation freedom of the engine and safety against crash.
It is therefore an object of the present invention which has been made to solve the above problems to provide a car power supply system which can improve the installation freedom of an engine and safety against crash and can obtain high output for a large-capacity electric load.
According to a first aspect of the present invention, there is provided a car power supply system comprising first and second generators which are smaller in size than a generator which is large in size and obtains high output for a large-capacity electric load by itself and a controller which causes the first generator to generate power by the start of the engine and causes the second generator to generate power when it detects that a vehicle is braked, wherein high output is obtained for the large-capacity electric load with the first and second generators.
When it is detected that the voltage of a battery loaded on the vehicle falls below a predetermined value, the second generator is caused to generate power, thereby making it possible to obtain high output for a large-capacity electric load with the first and second generators.
The above and other objects, features and advantages of the invention will become more apparent from the following description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 2020591 (1935-11-01), Temple
patent: 4347473 (1982-08-01), Stroud
patent: 4730097 (1988-03-01), Campbell et al.
patent: 4757249 (1988-07-01), Farber et al.
patent: 4788486 (1988-11-01), Mashino et al.
patent: 5254936 (1993-10-01), Leaf et al.
patent: 5739676 (1998-04-01), Judge et al.
patent: 6066897 (2000-05-01), Nakamura
patent: 4-197065 (1992-07-01), None

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