JPH07291026A - Rear fog lamp lighting control device - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent forgetting to turn off the rear fog lamp and to simplify the circuit. [Configuration] The rear fog lamp lighting control device 10 does not turn on the rear fog lamp switch 18 again even if the tail lamp switch 12 is turned on and the lighting conditions are satisfied once the rear fog lamp 34 is turned off.
The rear fog lamp 34 does not light up.
Further, the rear fog lamp switch 18 of the rear fog lamp lighting control device 10 has a normally open ON contact 18A for lighting the rear fog lamp 34, and a normally closed state for continuing to light the rear fog lamp 34 even when the power supply voltage changes. It is a 1-knob non-holding type having an OFF contact 18B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear fog lamp lighting control device for lighting or extinguishing a rear fog lamp mounted on a rear portion of a vehicle body of an automobile.

[0002]

2. Description of the Related Art In Europe, it is obligatory to equip a rear fog lamp on the rear part of an automobile body, and a vehicle equipped with a rear fog lamp has a rear fog lamp lighting control device for turning on or off the rear fog lamp. It is installed (Japanese Patent Laid-Open No. 61-22634).
No. 3).

Conventionally, the lighting conditions of the rear fob lamp by these rear fog lamp lighting control devices are generally as shown in the timing chart of FIG.

As shown in FIG. 3, in this timing chart, when the rear fog lamp switch is turned on while the lamp switch is operated to the headlamp on position, the rear fog lamp is turned on and the rear fog lamp switch is turned on. The rear fog lamp is turned off when it is turned off or when the lamp switch is operated to the tail lamp on position, that is, the head lamp off position.

[0005]

However, in these rear fog lamp lighting control devices, when the driver forgets to turn off the rear fog lamp switch as shown at the position of timing T0 in the timing chart of FIG. 3, the lamp switch is turned on again. When the vehicle is operated to the position where the headlamp is turned on, the rear fog lamp is lit regardless of the driver's intention. Therefore, it is easy to forget to turn off the rear fog lamp.

In order to improve this, it is conceivable to construct a circuit by using a non-holding type switch for the rear fog lamp switch. In this case, for example, the ignition switch is started after the rear fog lamp is turned on. Position, and when the power supply voltage drops below the specified value,
In order to prevent the keep relay from turning off and the rear fog lamp from turning off, it is necessary to make the power supply a constant voltage. Therefore, elements such as a Zener diode, a capacitor, and a resistor for forming a constant voltage circuit and wiring are required, which causes a problem that the circuit becomes complicated.

In view of the above facts, an object of the present invention is to provide a rear fog lamp lighting control device capable of preventing forgetting to turn off the rear fog lamp and simplifying the circuit.

[0008]

A rear fog lamp lighting control device according to a first aspect of the present invention includes a head lamp switch for lighting a head lamp, a tail lamp switch for lighting a tail lamp, and a front fog lamp. A front fog lamp switch for lighting, a non-holding type rear fog lamp switch for lighting the rear fog lamp, and an off state when the rear fog lamp switch is turned on by the headlight switch or the front fog lamp switch on. And a control circuit for turning on a rear fog lamp and turning off the rear fog lamp when the tail lamp switch is turned off, the rear fog lamp switch for turning on the rear fog lamp. And usually contacts for on the open state, are usually characterized in that the off contacts in the closed state, with one knob not holding type having to even when the power supply voltage fluctuation continuously illuminates the rear fog lamp.

[0009]

In the rear fog lamp lighting control device according to the first aspect of the present invention, when the rear fog lamp switch is turned on by the head lamp switch-on or the front fog lamp switch-on, the control circuit turns off the rear fog lamp. It lights up. Further, when the tail lamp switch is turned off, the control circuit turns off the rear fog lamp in the lit state.

In this case, in the rear fog lamp lighting control device of the present invention, since the rear fog lamp switch is the non-holding type, the rear fog lamp switch is returned to the original position after the ON operation. That is, in order to turn on the rear fog lamp once after turning it off, the rear fog lamp switch must be turned on when the lighting conditions are satisfied. Therefore, regardless of the driver's intention, the rear fog lamp does not light up, and it is possible to prevent forgetting to turn off the rear fog lamp.

Further, in the rear fog lamp switch, the OFF contact is closed even when the rear fog lamp is in the lighting state, and due to this closed state, the rear fog lamp continues to light even when the power supply voltage changes. Therefore, since the rear fog lamp is prevented from being extinguished when the power supply voltage changes, it is not necessary to make the circuit a constant voltage as in the conventional structure, and the circuit can be simplified.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rear fog lamp lighting control device according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, the rear fog lamp lighting control device 10 of the present embodiment includes a tail lamp switch 1
2, a head lamp switch 14, a front fog lamp switch 16 and a rear fog lamp switch 18 are provided, and the rear fog lamp switch 18 is a non-holding type. In addition, the rear fog lamp switch 18
Is a normally open ON contact 18A for lighting the rear fog lamp, and a normally closed OFF contact 18 for continuously lighting the rear fog lamp even when the power supply voltage fluctuates.
B is a one-knob type momentary switch.

The tail lamp switch 12 is always turned on if the head lamp switch 14 is turned on.

The tail lamp switch 12 is connected to the battery B via the coil 20B of the tail lamp relay 20.
The tail lamp 22 is connected to the battery B via the contact 20A of the tail lamp relay 20. Therefore, when the tail lamp switch 12 is turned on, the contact 20A of the tail lamp relay 20 is closed and current flows from the battery B to the tail lamp 22.

The headlamp switch 14 is connected to the battery B via the coil of the headlamp relay 24, and the headlamp (not shown) is connected to the battery via the contact (not shown) of the headlamp relay 24. ing. Therefore, when the headlamp switch 14 is turned on, the contact of the headlamp relay 24 is closed, and the current flows from the battery to the headlamp.

Further, the front fog lamp switch 16
Is connected to the battery B via the coil of the front fog lamp relay 26, and the front fog lamp (not shown) is connected to the battery via the contact (not shown) of the front fog lamp relay 26. Therefore, when the front fog lamp switch 16 is turned on,
The contacts of the front fog lamp relay 26 are closed so that a current flows from the battery to the front fog lamp.

The headlamp switch 14 is a diode 3
2, the contact 18 for turning on the rear fog lamp switch 18
A, a transistor 33 (NPN) forming a control circuit
Type), rear fog lamp relay 3 that constitutes a latch circuit
0 coil 30B, contact 20 of tail lamp relay 20
The front fog lamp switch 16 is connected to the battery B via A, and the front fog lamp switch 16 includes a diode 28, an ON contact 18A of the rear fog lamp switch 18, a transistor 33 forming a control circuit, and a coil 30B of a rear fog lamp relay 30 forming a latch circuit. , And is connected to the battery B via the contact 20A of the tail lamp relay 20.

Therefore, when the tail lamp switch 12 is turned on, the contact 20A of the tail lamp relay 20 is closed, and the head fog lamp switch 14 or the front fog lamp switch 16 is turned on, the rear fog lamp switch 18 is turned on. The ON contact 18A of the rear fog lamp switch 18 is closed and the contact 30A of the rear fog lamp relay 30 is closed, so that a current flows through the rear fog lamp 34.

At the same time, a current flows through the diode 36 connected to the contact 30A of the rear fog lamp relay 30 to turn on the transistor 38, which causes a new current loop L1.
You can Therefore, even if both the head lamp switch 14 and the front fog lamp switch 16 are turned off, if the tail lamp switch 12 is turned on, the transistors 33 and 38 are turned on, and the ground loop of the coil 30B of the rear fog lamp relay 30 is turned on. Is ensured and the current continues to flow to the rear fog lamp 34.

The OFF contact 18B of the rear fog lamp switch 18 connects the collector C of the transistor 33 and the collector C of the transistor 38, and after the operation of the rear fog lamp switch 18, it is the same as before the operation. The contact 18B for OFF is closed at this time, and a current flows through the contact 18B for OFF to the transistor 38 to form a current loop L2. Therefore, even if the voltage of the battery B fluctuates and the transistor 33 momentarily turns off, the current loop L2 causes the rear fog lamp relay 3 to operate.
The current of the coil 0B of 0 is not cut off.

On the other hand, when the tail lamp switch 12 is turned off, the contact 20A of the tail lamp relay 20 is opened, and the current loop to the circuit is broken. Therefore, regardless of whether the head lamp switch 14 and the front fog lamp switch 16 are on or off, Transistor 33, transistor 38,
All the rear fog lamp relays 30 are turned off, and the rear fog lamps 34 are also turned off. Further, since the rear fog lamp switch 18 is a non-holding type, the ON contact 18A is opened after the operation, so once the rear fog lamp 34 is turned off, the tail lamp switch 12 is turned on again and the lighting conditions are complete. Also, unless the rear fog lamp switch 18 is turned on again,
The rear fog lamp 34 does not light up.

Reference numeral 19 in FIG. 1 indicates a night lamp. Next, the operation of this embodiment will be described with reference to the timing chart of FIG.

As shown in FIG. 2, in the rear fog lamp lighting control device 10 of this embodiment, the tail lamp switch 12 is turned on and the front fog lamp switch 16 is turned on, as shown at the position of timing T1 in the timing chart of FIG. In this state, when the driver turns on the rear fog lamp switch 18, the unlit rear fog lamp 34 is turned on.

As shown at the position of timing T2 in the timing chart, when the driver turns off the tail lamp switch 12 while the rear fog lamp 34 is in the lighting state, the rear fog lamp 34 in the lighting state is turned off.

As shown at the position of timing T3 in the timing chart, even if the tail lamp switch 12 is on, if the head lamp switch 14 and the front fog lamp switch 16 are off, the driver
Even if the rear fog lamp switch 18 is turned on, the rear fog lamp 34 does not light up.

Even if the driver turns on the rear fog lamp switch 18 while the tail lamp switch 12 is on and the head lamp switch 14 is on as shown at the position of the timing T4, the rear fog lamp in the off state is also turned on. 34 is turned on.

As described above, in the rear fog lamp lighting control device 10 of this embodiment, since the rear fog lamp switch 18 is the non-holding type, the rear fog lamp switch 18 is returned to the original position after the ON operation. . That is, in order to turn on the rear fog lamp 34 once again, when the tail lamp switch 12 is turned on and the front fog lamp switch 16 is turned on or the head lamp switch 14 is turned on, the rear fog lamp switch 18 is turned on again. Therefore, regardless of the driver's intention, the rear fog lamp 34 does not light up, and it is possible to prevent forgetting to turn off the rear fog lamp 34.

Further, in the rear fog lamp lighting control device 10 of the present embodiment, the rear fog lamp switch 18 has the OFF contact 18B closed even when the rear fog lamp 34 is in a lighting state. Flows to the transistor 38 via the OFF contact 18B, forming a current loop L2.

Therefore, for example, even if the ignition switch is set to the start position after the rear fog lamp 34 is turned on and the power supply voltage becomes a predetermined value or less and the transistor 33 is momentarily turned off, the coil 30 of the rear fog lamp relay 30 is turned on.
The current of B is not cut off, and the rear fog lamp 34
Never goes out. Note that the transistor 33, which has been turned off for a moment, is turned on again when the power is restored.

Therefore, since the rear fog lamp 34 is prevented from being extinguished when the power supply voltage changes, it is not necessary to make the circuit a constant voltage as in the conventional structure, and the circuit can be simplified.
In addition, the ability of the power supply fluctuations can withstand fluctuations up to the return voltage (2 to 3 V) of the rear fog lamp relay 30.

[0032]

Since the rear fog lamp lighting control device according to the present invention is configured as described above, it has the excellent effects of preventing forgetting to turn off the rear fog lamp and simplifying the circuit.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a rear fog lamp lighting control device according to an embodiment of the present invention.

FIG. 2 is a timing chart of a rear fog lamp lighting control device according to an embodiment of the present invention.

FIG. 3 is a timing chart of a rear fog lamp lighting control device according to a conventional example.

[Explanation of symbols]

 10 Rear fog lamp lighting control device 12 Tail lamp switch 14 Head lamp switch 16 Front fog lamp switch 18 Rear fog lamp switch 18A ON contact 18B OFF contact 20 Tail lamp relay 30 Rear fog lamp relay 33 Transistor 34 Rear fog lamp

Claims (1)

[Claims] 1. A headlamp switch for turning on a headlamp, a tail lamp switch for turning on a tail lamp, a front fog lamp switch for turning on a front fog lamp, and a non-holding type for turning on a rear fog lamp. When the rear fog lamp switch and the front fog lamp switch are turned on and the rear fog lamp switch is turned on, the rear fog lamp is turned off, and when the tail lamp switch is turned off, the rear fog lamp is turned on. A control circuit for turning off a certain rear fog lamp, and the rear fog lamp switch is a normally open ON contact for turning on the rear fog lamp, and the rear fog lamp is continuously turned on even when the power supply voltage changes. A rear fog lamp lighting control device having a 1-knob non-holding type having a normally-closed OFF contact for opening.