JPS6145757Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a power generation display for an alternator with a non-contact regulator equipped with an excitation diode for supplying a part of the current generated during power generation by the alternator to the field coil as excitation current. Regarding equipment.

Conventionally, automotive alternators (hereinafter referred to as alternators) have used contact type regulators that mechanically interrupt the field current of the alternator using contacts to maintain a constant voltage generated by the alternator, but in recent years, hybrid regulators have been used. AC generators with non-contact type regulators that use semiconductor circuits mainly composed of ICs to intermittent field current are coming into use. This alternator with a non-contact type regulator does not use mechanical contacts, so it is characterized by high reliability and long life.

An example of the circuit of such a conventional vehicle alternator is shown in FIG. In the figure, reference numeral 10 includes a stator coil 12, a rectifier 14, a field coil 16, and an excitation diode 18 for supplying part of the current generated during power generation to the field coil 16 as an excitation current, and a hybrid IC is used. 22 is a charge warning lamp, one terminal of which is connected to the regulator terminal L of the alternator 10, for warning of a power generation stop state; , the charge warning lamp 22
The ignition switch 26 is connected to the other terminal of the alternator 10 via a fuse 30, and is connected to the battery terminal B of the alternator 10.
A battery connected to the other terminal of the ignition switch 24, 28 a fusible link, 3
0 is a fuse.

In such a conventional alternator circuit, when the ignition switch 24 is off, the circuit is open and the charge warning lamp 22 does not light up. When the ignition switch 24 is turned on and the engine is in a standby state where the engine is stopped or in an engine stall state after starting, the potential at point A of the alternator 10 is almost zero, so the current supplied from the battery 26 is However, the ignition switch 24, charge warning lamp 22, regulator terminal L,
The field current flows through the field coil 16 and the IC regulator 20, and the field current is supplied to the field coil 16, and the charge warning lamp 22 is turned on. When the engine is put into operation by rotating the starter, the alternator 10 starts generating electricity, and a voltage close to the battery voltage is generated at point A. Therefore, both ends of the charge warning lamp 22 are at almost the same potential, and the charge warning lamp 22 is at almost the same potential. The awning lamp 22 is turned off.

In this way, the charge warning lamp 22 detects that the ignition switch 24 is on and the engine is stopped, and that the alternator 10 has stopped generating electricity due to a failure. , in the conventional circuit, the charge warning lamp 2 is activated during power generation.
When the potential difference between both ends of the alternator 2 becomes slightly large, the charge warning lamp 22 lights up slightly even when the alternator 10 is normal, causing a problem in that the function of the alternator may be insecure.

Furthermore, even when the ignition switch 24 is on and the engine (alternator 10) is stopped, there is a voltage drop due to the field coil 16 of the alternator 10 and the transistor Tr in the IC regulator 20, so a charge warning occurs. There was also a problem in that the terminal on the alternator 10 side of the lamp 22 was not completely at ground potential, but had a slightly positive potential with respect to the ground potential. In this way, charge warning lamp 2
If the terminal on the alternator 10 side of No. 2 does not reach the ground potential completely, various parts that operate while the ignition switch 24 is on and the engine is stopped, for example, may be turned on to check for disconnection. A problem arises in that the disconnection check (failure diagnosis) of the stop lamp disconnection warning light, washers level warning light, battery fluid level warning light, engine oil level warning light, etc., which is often performed, may not be completed completely.

The present invention was made to solve the above-mentioned drawbacks of the conventional technology, and it is possible that the switch connected to the energizing circuit to the field coil is on and the alternator is not generating electricity or the alternating current generator is not generating electricity due to a malfunction. An alternating current that can operate the power generation display means only in a worn-out state to eliminate the confusing operation of the power generation display means and completely set the potential of one terminal of the power generation display means to which the fault diagnosis means is connected to the ground potential. The purpose of the present invention is to provide a power generation display device for a generator.

The present invention provides a power generation display device for an alternator with a non-contact type regulator equipped with an excitation diode for supplying part of the generated current to the field coil as excitation current during power generation of the alternator.
a power generation display means whose one terminal is connected to the battery via a switch connected to the energizing circuit for the field coil; a relay coil connected to the output side of the excitation diode; a current limiting resistor and a backflow prevention diode inserted into a current supply circuit for supplying an initial excitation current to the field coil and for preventing malfunction of the relay coil due to the initial excitation current; One contact, which is opened by excitation, is grounded, and the other contact connects the other terminal of the power generation display means and the other contact to ground potential to perform failure diagnosis when the alternator is not generating power. The above-mentioned object is achieved by providing a normally closed contact connected to a fault diagnosing means.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In the present embodiment, as shown in FIG. Awning lamp 22 and relay coil 4 connected to the output side of excitation diode 18
4, an initial excitation current is supplied to the field coil 16 inserted into the energization circuit from the ignition switch 24 to the field coil 16 via the fuse 32, and the relay coil 44 is activated by the initial excitation current. A current limiting resistor 34 and a backflow prevention diode 36 are used to prevent malfunction, and one contact that is opened by excitation of the relay coil 44 is grounded, and the other contact is grounded.
A normally closed contact 42 is connected to the other terminal of the charge warning lamp 22 and to various parts of a fault diagnosis means for diagnosing a fault when the alternator 10 is not generating electricity, with the other contact at ground potential. This is different from the conventional example.

The power generation display relay 4 is operated by the normally closed contact 42 and the relay coil 44 for exciting it.
0, and one terminal of the relay coil 44 is connected to the normally closed contact 42 and grounded. Further, the other terminal of the relay coil 44 is connected to the regulator terminal L of the alternator 10. Further, the other terminal of the normally closed contact 42 is connected to the other terminal of the charge warning lamp 22, and the other terminal of the normally closed contact 42 is connected to the other terminal of the charge warning lamp 22.
When the engine is stopped and 0 is not in a power generation state, the other terminal of the normally closed contact 42 is set to ground potential to perform fault diagnosis.
It is connected to the stop lamp disconnection warning light, washer level warning light, battery fluid level warning light, engine oil level warning light, etc., which are often checked for disconnection.

The operation will be explained below.

First, when the ignition switch 24 is off, no current is supplied to the charge warning lamp 22, so the charge warning lamp 22 is in an off state.

When the ignition switch 24 is turned on, the current supplied from the battery 26 passes through the ignition switch, the reverse current prevention diode 36, and the current limiting resistor 34 to the field coil 16.
At the same time, part of the current flows through the ignition switch 24, the charge warning lamp 22, and the normally closed contact 42 of the power generation display relay 40. is lit. When the engine is stopped, the potential of the regulator terminal L of the alternator 10 is approximately OV.
In addition, since the excitation current supplied from the ignition switch 24 to the field coil 16 via the reverse current prevention diode 36 and the current limiting resistor 34 is also limited, the power generation display relay 40
The current flowing through the relay coil 44 is also small, and the potentials at both ends are approximately equal, so that the normally closed contact 42
is in a closed state. At this time, since the terminal on the side of the power generation display relay 40 of the charge warning lamp 22 is directly grounded by the normally closed contact 42, the various components receiving signals from this terminal have a complete ground potential. The various parts mentioned above will not malfunction.

Furthermore, when the starter is rotated to put the engine into operation, the alternator 10 starts generating electricity, and a voltage rectified by the excitation diode 18 is generated at the regulator terminal L of the alternator 10. This voltage is not only supplied to the field coil 16 as an exciting current, but also current flows through the relay coil 44 of the power generation display relay 40, so the normally closed contact 42 of the power generation display relay 40 is opened, and the charge The awning lamp 22 is turned off again. At this time, since the relay coil 44 is energized by the output of the substantially DC excitation diode 18, no noise is generated due to the energization even when the relay coil 44 is energized.

In this way, the device in this embodiment operates the charge warning lamp 22 only when the ignition switch 24 is on, the engine is stopped, and the alternator 10 has stopped generating electricity due to a failure. , it is possible to eliminate the confusing operation of the charge warning lamp 22. Furthermore, since the relay coil 44 is energized by a substantially direct current signal, no noise is generated when the relay coil 44 is energized. Furthermore, when the engine is stopped, the potential of one terminal of the charge warning lamp 22 is completely at the ground potential, regardless of the on/off state of the ignition switch 24, so that various parts can be securely connected. can be supplied with ground potential.

In the above embodiment, the power generation display means of the power generation display device was a warning lamp, but
The power generation display means is not limited to this, and for example, a sound warning can also be used.

Further, in the above embodiment, the present invention is applied to a power generation display device for an automobile alternator, but the scope of application of the present invention is not limited to this, and it is clear that the present invention can be applied to a power generation display device for a general alternator. be.

As explained above, according to the present invention, only when the switch connected to the energizing circuit to the field coil is on and the alternator is not generating electricity or when the alternator has stopped generating electricity due to a failure It is possible to eliminate the confusing operation of the power generation display means by activating the power generation display means, and it is also possible to prevent noise from being generated when the relay coil is energized.
Further, it has excellent effects such as being able to prevent malfunctions of the fault diagnosis means that diagnoses faults when the alternator is not generating electricity by setting the normally closed contacts of the relay coils to ground potential.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a conventional power generation display device for an alternator with a non-contact type regulator, and FIG. 2 is a circuit diagram showing an embodiment of the power generation display device for an alternator according to the present invention. 10... Alternator, 12... Stator coil, 14... Rectifier, 16... Field coil, 18... Excitation diode, 20...
...IC regulator, 22...Charge warning lamp, 24...Ignition switch,
26... Battery, 34... Current limiting resistor, 36
... Backflow prevention diode, 40 ... Power generation display relay, 42 ... Normally closed contact, 44 ... Relay coil.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Power generation display for an alternator with a non-contact regulator equipped with an excitation diode for supplying part of the current generated during power generation by the alternator to the field coil as excitation current The device includes: a power generation display means whose one terminal is connected to the battery via a switch connected to a current supply circuit to the field coil; a relay coil connected to the output side of the excitation diode; and the switch. a current limiting resistor and a backflow prevention diode inserted into a current supply circuit from to the field coil for supplying an initial excitation current to the field coil and for preventing malfunction of the relay coil due to the initial excitation current; opened by excitation of the relay coil,
One contact is grounded, and the other contact is connected to the other terminal of the power generation display means and to a fault diagnosis means for diagnosing a fault when the alternator is not generating power by setting the other contact at ground potential. A power generation display device for an alternator, characterized by comprising a normally closed contact and the following. (2) The power generation display device for an AC generator according to claim 1, wherein the power generation display means is a lamp.