JPS634408B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a battery charging device for a vehicle, and an object of the present invention is to provide a charging device that can lower the generated voltage when a lighting system is turned on than the generated voltage when the lighting system is turned off.

In order to obtain good charging of the battery, a corresponding charging voltage must be secured, and it is desirable from the viewpoint of charging performance that this charging voltage be as high as possible without overcharging the battery. However, on the other hand, the power line for small lamps such as head lamps, license plate lamps, clearance lamps, and tail lamps is usually connected directly to the battery terminal, so if the battery charging voltage becomes too high when the lamp is lit at night, etc. Because the high voltage remains applied to each lamp, the lifespan of these lamps is shortened and other adverse effects occur.

Conventionally, due to the above-mentioned limitations, the charging voltage at the battery terminal, which is adjusted by a voltage regulator, was
Due to the charging performance of the battery, it was not possible to increase it to the optimum value.

In addition, if the voltage detection point is fixed at the output end of a charging generator such as an alternator, a voltage drop between the alternator and the battery may occur due to the load, not only when using lighting at night but also during the day when the load is applied to the blower motor, defogger, etc. The voltage drop also occurs when a battery is used, and the battery voltage decreases by the amount of the drop, which is not desirable in terms of charging performance.

The present invention includes a lighting detection means for detecting lighting of a lighting device of a vehicle, and a generator (alternator) for charging a battery when the lighting is turned on based on an output signal of the lighting detection means.
an output voltage switching means for controlling an output voltage adjustment circuit (regulator) of the generator so as to reduce the output terminal voltage of the generator to be lower than the output terminal voltage when the lights are off, and the detection voltage of the regulator is changed when the lights are on and when the lights are off. By switching between 1 and 2, the charging voltage applied to the battery terminal can be increased somewhat when the lighting system is not used, such as during the day, increasing the amount of charge in the battery and improving the charging performance of the charging device. When the lamp is turned on, the battery charging voltage is slightly lowered to extend the life of the lamp.The structure of the lamp will be explained below with reference to the drawings.

In the first embodiment shown in FIG. 1, the generated voltage of an alternator 1 is adjusted by current control of a field coil 2, and the voltage detection point of the voltage detection terminal 4, which is the B terminal of the regulator 3, is not fixed, When the light is off, such as when the light is off, the terminal 6 of the battery 5 is used, and when the light is turned on, such as at night, the switch is switched to the B terminal 7 of the alternator 1. In the illustrated example, the regulator 3 is a Chiril type regulator, which controls the voltage generated by the alternator 1, and controls the voltage detection point of the voltage detection terminal 4 by a voltage detection point control relay 10 that operates in conjunction with a light control switch 9. When the light is turned off, it is connected to the terminal 6 of the battery 5, and when it is turned on, that is, when the small type lamps (including the license plate lamp 11, tail lamp 12, clearance lamp 13, etc.) are turned on, and when the head lamp 14 is turned on,
It is connected to the B terminal 7 of the alternator 1 by switching. That is, the control relay 10
The coil 16 is used as a lighting detection means, and the contact 16a is used as an output voltage switching means of the regulator 3. The control relay 10 is a relay having transfer contacts or make, before, and break contacts.

In the illustrated example, the terminal 6 and the headlamp 14
There is a headlight control switch 1 between
Similarly, small lights such as the license plate lamp 11, tail lamp 12, clearance lamp 13, etc. are small lights that are opened and closed by the light control switch 9 as described above. This is done by control relay 17.

Switching terminals 18, 19 of control relay 10
are connected to the terminal 6 and the B terminal 7 of the alternator 1, respectively, and when the light is off, that is, when no current flows to the light control switch 9 and no current flows to the coil 16, the voltage detection end 4 is connected to the contact 16a as shown in the figure. is connected to terminal 6 via
When a current flows through the coil 16 during lighting, the contact 16a
is switched and connected to the B terminal 7.

In FIG. 1, 20 is an ignition switch, and 21 is a charge warning lamp.

Next, the effects of this embodiment will be described.

As an example, the voltage adjusted by regulator 3 is
14.8V, the total current consumption of the head lamp 14 and the small lamps 11, 12, 13, etc. is about 15A, and this current consumption is transferred to the B terminal 7 of the alternator 1.
Suppose that a voltage drop of about 0.5V occurs in the conductor 8, which is a charging line, from the B terminal 7 of the alternator 1 to the terminal 6 of the battery 5 when the voltage is supplied to each lamp via the terminal 6 of the battery 5.

According to the voltage detection point switching method of this embodiment, when the lights are turned off, such as during the day, the battery voltage is adjusted to a maximum of 14.8V by detecting the battery voltage at the terminal 6 of the battery 5, and when the lights are turned on, such as at night, the battery voltage is adjusted to a maximum of 14.8V. By sensing the alternator voltage at the B terminal 7 of 1, the alternator voltage is regulated to a maximum of 14.8V, in which case the battery voltage is 14.8-0.5=14.3V. Therefore, when the lights are off,
Compared to the case where the voltage is detected at the battery terminal both when the lamp is lit, the battery voltage can be lowered by 0.5V when the lamp is lit at night.

In addition, when voltage is detected at the alternator B terminal both when the lights are off and when the lights are on, even when the lights are off during the daytime, when other loads such as the blower motor and defogger are used, these load currents cause the voltage in the conductor 8 between the alternator and the battery to increase. A voltage drop occurs, and the battery voltage decreases by this voltage drop. However, in the voltage detection point switching method of this embodiment, since battery voltage is detected when the light is off, the battery voltage decreases by the voltage drop of the conductor 8. It never gets lower,
It is convenient for loads other than lighting systems and for charging batteries. That is, by using the voltage detection point switching method, it is possible to have both the advantages of setting the voltage detection point of the regulator 3 to the alternator B terminal 7 and the advantages of setting it to the battery terminal 6, and to turn off the lights during the daytime. At times, the best battery charging voltage can be secured, and when the lamp is turned on, such as at night, the battery voltage can be kept low by the voltage drop in the charging line caused by the current consumption of the lighting system load, extending the lamp life. .

Next, a second embodiment will be explained with reference to FIG.

In FIG. 2, the same components as in FIG. 1 are indicated by the same reference numerals or are omitted. In Figure 2, IG goes to the IG terminal of the regulator 3 as in Figure 1, L goes to the L terminal, B goes to the terminal 6 of the battery 5, H goes to the coil of the headlight control switch 15, and S goes to the small light control relay. 17 coils, alternator 1, regulator 3, battery 5, headlight control switch 15, headlamp 14, small light control relay 1.
7. The license plate lamp 11, tail lamp 12, clearance lamp 13, etc. are omitted because they are the same.

In this embodiment, a control relay 22 is used instead of the control relay 10 of the first embodiment.
are provided, the contacts 23 of which are connected in parallel to short-circuit the resistor 24, and the coil 2
5 is connected between the terminal 6 of the battery 5 and the light control switch 9 like the coil 16 in FIG. 1, and the resistor 24 is connected between the ignition switch 20 and the IG terminal of the regulator 3. . That is, the coil 25 of the control relay 22 is used as a lighting detection means,
The contact 23 is used as an output voltage switching means of the regulator 3.

The contact 23 of the control relay 22 is a B contact, that is, it is normally closed, and when no current flows through the coil 25, the resistor 24 is short-circuited, and when the light control switch 9 operates to the lighting side and current flows through the coil 25, the contact 23 is opened, and the short-circuited state of the resistor 24 is released.

With the above-mentioned configuration, when the lights are turned off, such as during the day, the resistor 24 is short-circuited, and the voltage applied to the IG terminal of the regulator 3 is the voltage at the terminal 6 of the battery 5, and when the lights are turned on, such as at night, the resistor 24 is short-circuited.
The voltage applied to the terminal is lower than the voltage at terminal 6 of battery 5 by the voltage drop across resistor 24, and as a result, the current in field coil 2 of alternator 1 decreases due to the operation of regulator 3.
When the light is on, the voltage generated by the alternator 1 is lower than when the light is off. This generated voltage drop is determined by the resistance 24
Depends on the resistance value.

Therefore, the same effects as in the first embodiment can be obtained.

In this embodiment, the B terminal of the regulator 3 is connected to the terminal 6 of the battery 5 or the alternator 1.
It is fixedly connected to one of the B terminals 7 of the terminal.

Further, a third embodiment will be explained with reference to FIG.

In Figure 3, the same configuration as in Figure 1 is
They are indicated by the same reference numerals in the figures or are omitted.
In the figure, B is connected to the terminal 6 of the battery 5, H is connected to the coil of the headlight control switch 15, S is connected to the coil of the small light control relay 17, and as in FIG. 2, part of the alternator 1, regulator 3, battery 5, headlight control switch 15, headlamp 14, small light control relay 17,
License plate lamp 11, tail lamp 1
2. The clearance lamp 13 and the like are omitted because they are the same.

In this embodiment, instead of the control relay 10 of the first embodiment, a resistor 28 is connected in series with the coil 27 of the voltage control relay 26 of the regulator 3, and the resistor 28 can be short-circuited as in the second embodiment. A control relay 29 is provided.
The contacts 30 of the relay 29 are connected in parallel to the resistor 28, and the coil 31 of the relay 29 is connected to the terminal 6 of the battery 5, similar to the coil 16 in FIG.
and the light control switch 9. That is, the control relay 2
The coil 31 of 9 is used as a lighting detection means, and the contact 30 is used as an output voltage switching means of the regulator 3.

The contact 30 of the control relay 29 is an a contact, that is, it is normally open, and if no current flows through the coil 31 when the light is off, the resistor 28 works, and the light control switch 9 operates to the on side and current flows through the coil 31. The contact 30 is closed to short-circuit the resistor 28.

With the above-mentioned configuration, when the lights are turned off, such as during the day, the resistor 28 is inserted into the circuit of the coil 27, so the current flowing through the coil 27 is reduced by the voltage drop across the resistor 28, and when the lights are turned on, such as at night, the resistor 28 is inserted into the circuit of the coil 27. Since 28 is short-circuited, the current flowing through coil 27 increases.

As a result, due to the operation of the regulator 3, the current in the field coil 2 of the alternator 1 is reduced when the light is on, compared to when the light is off, and the voltage generated by the alternator 1 is lower when the light is on, compared to when the light is off.

The amount of power generation voltage drop depends on the resistance value of the resistor 28.

Therefore, the same effects as in the first embodiment can be obtained.

The B terminal of the regulator 3 is fixedly connected to either the terminal 6 of the battery 5 or the B terminal 7 of the alternator 1.

Since the present invention has the configuration described in the claims, the output voltage switching means can switch the regulated voltage in the voltage regulating circuit by detecting whether or not the lighting is on by the lighting detection means, and the adjustment voltage in the voltage regulating circuit can be switched by the output voltage switching means. When the lamp is on, the output voltage of the generator can be kept lower than when the lamp is off, such as during the day. This ensures the best battery charging voltage when the lamp is off, and extends the lamp life by lowering the generator output voltage when the lamp is on. This is an excellent invention that can be used.

[Brief explanation of the drawing]

Figure 1 is the circuit diagram of the first embodiment, Figure 2 is the circuit diagram of the second embodiment.
FIG. 3 is a partial circuit diagram of the third embodiment. 1... Alternator, 2... Field coil, 3
...Regulator, 5...Battery, 9...Light control switch, 10, 22, 29...Control relay, 16, 25, 31...Coil, 16
a, 23, 30...Contact.

Claims (1)

[Claims] 1. The battery charging generator detects the voltage at a predetermined position in the power supply system of the vehicle, and adjusts the field current of the generator so as to maintain the voltage at the predetermined position at the set voltage, thereby increasing the output terminal voltage of the generator. In a vehicle battery charging device, the vehicle battery charging device includes a lighting detection means for detecting lighting of a lighting device of the vehicle, and an output terminal voltage of the generator at the time of lighting based on an output signal of the lighting detection means. and output voltage switching means for controlling the output voltage adjustment circuit so that the voltage at the output terminal is lower than the voltage at the output terminal when the lights are turned off.