JPH10309978A - Rear fog lamp lighting controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the circuit configuration of fog lamps by employing a single switch serving as a front fog lamp switch and a rear fog lamp switch as well. SOLUTION: A control circuit 70 is adapted to light a rear fog lamp on when a switch 60 is flicked so that its movable contact 60A comes into contact with its fixed contact 60B and a switch 62 is flicked so that its movable contact 62A comes into contact with both its fixed contacts 62B and 62C, and to light the fog lamp off when the switch 60 is turned off with the switch 62 held still on in which the movable contact 62A is held in contact with both the fixed contacts 62B and 62C. With the fog lamp being off in that way, the circuit 70 keeps the fog lamp off even when the switch 60 is flicked on again so that the movable contact 60A comes into contact with the fixed contact 60B.

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 controlling a rear fog lamp to turn on or off under a predetermined condition a rear fog lamp mounted on a rear part of a vehicle body of an automobile.

[0002]

2. Description of the Related Art It is well known in Europe that a rear fog lamp is required to be mounted on the rear part of a vehicle body of a vehicle. The device is mounted.

A conventional rear fog lamp lighting control device is disclosed in Japanese Patent Application Laid-Open No. 7-32937. FIG. 3 shows the configuration of this device. In the figure,
The rear fog lamp lighting control device 10 includes a tail lamp switch 12, a head lamp switch 14, a front fog lamp switch 16, and a rear fog lamp switch 1.
8 and the rear fog lamp switch 18 is a non-holding type. Note that the tail lamp 12 is configured to operate in conjunction with the head lamp switch 14 and to be turned on whenever the head lamp switch 14 is turned on.

In the circuit configuration shown in FIG. 3, when the tail lamp switch 12 is turned on, the contact 20 of the tail lamp relay 20 is turned on.
When the rear fog lamp switch 18 is turned on while the head lamp switch 14 or the front fog lamp switch 16 is turned on, the contact 30A of the rear fog lamp relay 30 is closed and a current flows through the rear fog lamp 34, The fog lamp 34 lights up.
At the same time, current flows through the diode 36 connected to the contact 30A of the rear fog lamp relay 30, the transistor 38 is turned on, and a new current loop L1 is formed. For this reason, even if both the headlamp switch 14 and the front fog lamp switch 16 are off, if the tail lamp switch 12 is on, the transistor 3
3 and 38 are on, the rear fog lamp relay 30
Since the ground loop of the coil 30B is secured and current continues to flow through the rear fog lamp 34, the lighting state of the rear fog lamp 34 is maintained.

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 cut off, so that 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 contacts 30A of the rear fog lamp relay 30 are turned off, and the rear fog lamp 34 is also turned off. Therefore, once the rear fog lamp 34 is turned off, even if the tail lamp switch 12 is turned on again and the lighting conditions are met, the rear fog lamp 34 does not turn on unless the rear fog lamp switch 18 is turned on again.

As described above, in the conventional rear fog lamp lighting control device, the front fog lamp switch and the rear fog lamp switch are provided independently, and the operating conditions of the rear fog lamp are controlled by various switches including the front fog lamp switch and the rear fog lamp switch. Control the lighting of the rear fog lamp based on the operation state,
The circuit was configured to prevent forgetting to turn off the rear fog lamp.

[0007]

As described above, in the conventional rear fog lamp lighting control device, the front fog lamp switch and the rear fog lamp switch are provided independently, and the operation conditions of the rear fog lamp are determined by the front fog lamp switch. In addition, there is a problem that the circuit configuration is complicated because the circuit is configured to correspond to the operation states of various switches including the rear fog lamp switch.

The present invention has been made in view of such circumstances, and provides a rear fog lamp lighting control device in which the front fog lamp switch and the rear fog lamp switch are configured by a single switch, and the circuit configuration is simplified. The purpose is to do.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, a first switch means for supplying power to a control means and a second switch means for lighting only a front fog lamp are provided. A second switching means having a first switching position and a second switching position for turning on a front fog lamp and a rear fog lamp; and a rear fog lamp based on operation outputs of the first switching means and the second switching means. Control means for controlling lighting,
The control means turns on a rear fog lamp when the first switch means is switched on and the second switch means is switched to a second switching position, and the second switch means If the first switch is switched off in the state where the first switch is switched to the second switching position, the rear fog lamp is turned off and the first switch is switched on. After the second switch means is once switched from the second switching position to another switching position, control is performed so that the rear fog lamp remains off unless switched to the second switching position again. It is characterized by doing.

In the rear fog lamp lighting control device having the above-described structure, the control means includes: a first switch unit which is turned on and a second switch unit which is switched to a second switching position; Is turned on, and when the first switch means is turned off while the second switch means is kept switched to the second switching position, the rear fog lamp is turned off, and then the first switch means is turned off. Even if the switch means is switched to the ON state, the second switch means is once switched from the second switching position to another switching position, and unless the second switching position is switched again to the second switching position, The fog lamp is controlled so as to remain turned off.

According to the first aspect of the present invention, the rear fog lamp switch and the rear fog lamp switch which are independently provided in the conventional device are constituted by a single switch so as to satisfy the operating conditions of the rear fog lamp. Since the circuit is configured, the number of components can be reduced and the circuit configuration can be simplified.

[0012]

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

A rear fog lamp lighting control device according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a configuration of a rear fog lamp lighting control device according to an embodiment of the present invention. In the rear fog lamp lighting control device according to the embodiment of the present invention, the front fog lamp switch and the rear fog lamp switch are configured by a single switch, and the circuit is configured to satisfy the operation conditions of the rear fog lamp. In FIG. 1, a rear fog lamp lighting control device 50 includes a tail lamp 69, a switch 60 for turning on or off one or both of a head lamp, and a switch 62 for turning on or off one or both of a front fog lamp and a rear fog lamp. , Head lamp relay 64, front fog lamp relay 66, rear fog lamp relay 67
, A tail lamp relay 68, and a control circuit 70.

The switch 60 includes a tail lamp switch and a head lamp switch as a single switch, and includes a movable contact 60A and fixed contacts 60B and 60C.
, And one end of the movable contact 60A is grounded. The fixed contact 60B is connected to the battery (+ B) via the relay coil 68B of the tail lamp relay 68, and the fixed contact 60C is connected to the battery (+ B) via the relay coil 64B of the head lamp relay 64. The switch 60 functions as a switch for supplying power from the battery (+ B) to the control circuit 70.

The switch 62 is a single switch composed of a front fog lamp switch and a rear fog lamp switch, and includes a movable contact 62A and a fixed contact 62.
B, 62C, and one end of the movable contact 62A is grounded. The fixed contact 62B is connected to a battery (+ B) via a relay coil 66B of the front fog lamp relay 66 and a relay contact 68A of the tail lamp relay 68.
The fixed contact 62C is connected to the emitter of the transistor Q1 included in the control circuit 70. One end of the tail lamp 69 is connected to the battery (+ B) via a relay contact 68A of the tail lamp relay 68, and the other end is grounded.

Further, one end of the relay coil 67B of the rear fog lamp relay 67 is connected to the collector of the transistor Q1, and the other end of the relay coil 67B is connected to the battery (+ B) via the relay contact 68A of the tail lamp relay 68.

In FIG. 1, the relay contacts of the head lamp relay 64, the front fog lamp relay 66, and the rear fog lamp relay 67 are omitted for convenience of explanation.

Although not shown, the headlamp, the front fog lamp, and the rear fog lamp include a headlamp relay 64, a front fog lamp relay 6, respectively.
6 and the rear fog lamp relay 67 are connected to a battery (+ B) via respective relay contacts.

The control circuit 70 includes transistors Q1, Q2, Q3, and Q4 as switching elements, diodes 72, 76, 78, a Zener diode 74, and resistors 82, 84, 86, 88, 90, 92 for bias. 9
4, 96, 98 and 100 and a capacitor C1.

The collector of the transistor Q1 is connected to the cathode of the Zener diode 74, and the anode of the Zener diode 74 is grounded. Transistor Q1
Is the relay contact 68A of the tail lamp relay 68
Is connected through resistors 82 and 84 and a diode 72, and a connection point between the resistor 84 and the diode 72 is connected to a resistor 86.
Grounded. The anode of the diode 72 is connected to a connection point between the resistors 84 and 86, and the cathode is connected to the base of the transistor Q1.

The collector of the transistor Q2 is connected via a diode 76 to a connection point between the resistors 82 and 84, and the emitter is grounded. Also, the transistor Q2
Is grounded via a resistor 88 and a resistor 9
0 and 92 are connected to the collector of the transistor Q3. The anode of the diode 76 is connected to the connection point of the resistors 82 and 84, and the cathode is connected to the collector of the transistor Q2.

The emitter of the transistor Q3 is connected to one end of a relay contact 68A of the tail lamp relay 68 and is connected to the base via a resistor 94. The base of the transistor Q3 is connected to the switch 62 via a resistor 96.
Are connected to the fixed contact 62C. The collector of the transistor Q3 is connected to the anode of the diode 78 via the resistor 92, and the cathode of the diode 78 is connected to the collector of the transistor Q4.

The base of the transistor Q4 is connected to the connection point between the resistors 82 and 84 via the resistor 98, and the emitter is grounded. A parallel circuit of a capacitor C1 and a resistor 100 is connected between the base and the emitter of the transistor Q4.

In the embodiment of the present invention, the first switch means of the present invention corresponds to the switch 60, the second switch means corresponds to the switch 62, and the control means corresponds to the control circuit 70.

Next, the operation of the rear fog lamp lighting control device 50 having the above configuration will be described with reference to the timing chart of FIG. In FIG. 2, at time T1, the switch 60
Is operated to switch the movable contact 60A to a position where the movable contact 60A contacts the fixed contact 60B, the relay coil 68B of the tail lamp relay 68 is energized.
A is closed, and the tail lamp 69 is turned on. At this point, the switch 62 is in the OFF state, so that the transistor Q
1, Q2, Q3, and Q4 are in a non-conductive state, and since no current flows through the relay coils 66B and 67B of the front fog lamp relay 66 and the rear fog lamp relay 67, the front fog lamp and the rear fog lamp (not shown) are turned off. is there.

Next, at time T2, the switch 62 is operated.
When the movable contact 62A of the switch 62 is switched to a position where it contacts the fixed contact 62B, the tail lamp relay 68
The current flows from the battery (+ B) to the relay coil 66B of the front fog lamp relay 66 via the relay contact 68A, so that the front fog lamp is turned on.
At this point, the rear fog lamp is off. Further, when the switch 62 is operated at time T3 and the movable contact 62A of the switch 62 is switched to a position where it contacts both the fixed contact 62B and the fixed contact 62C, the transistor Q
Since the connection point P between the emitter 1 and the resistor 96 is grounded, a battery (+ B) is connected to the transistors Q1, Q3 and Q4.
Since a DC bias is applied so as to operate in a more saturated region and the capacitor C1 is already charged, the transistors Q1, Q3, and Q4 are substantially simultaneously turned on.
As a result, the tail lamp relay 6
A current flows through the relay coil 67B of the rear fog lamp relay 67 via the relay contact 68A of No. 8, and a rear fog lamp (not shown) is turned on. Note that a DC bias is not applied to the transistor Q2 unless the transistor Q3 is turned on. However, when the transistor Q3 is turned on, the base potential of the transistor Q2 is ground potential because the transistor Q4 has already been turned on. , And the transistor Q2 is turned off.

On the other hand, at time T4, while the movable contact 62A of the switch 62 is switched to the position where it contacts both the fixed contact 62B and the fixed contact 62C, the switch 60
Is switched from the position where the movable contact 60A is in contact with the fixed contact 60B to the position where it is turned off, the tail lamp 69 is turned off, and the power supply from the battery (+ B) to the transistors Q1, Q2, Q3 and Q4 is cut off. As a result, the transistors Q1, Q2, Q3, and Q4 are turned off, and no current flows through the relay coils 66B and 67B of the front fog lamp relay 66 and the rear fog lamp relay 67. Turns off. In this state, when the switch 60 is operated at the time T5 and the movable contact 60A is switched from the OFF state to the position in contact with the fixed contact 60B, the tail lamp 69 is turned on, and the relay contact 68A of the tail lamp relay 68 is closed. Since a current flows from the battery (+ B) to the relay coil 66B of the front fog lamp relay 66 via the relay contact 68A, the front fog lamp is turned on. However, power is supplied from the battery (+ B) to the transistors Q1, Q2, Q3, and Q4. Nevertheless, at this point the rear fog lamp remains off. That is, the transistors Q1, Q2, Q3, Q4 are output from the battery (+ B).
When power is supplied to the transistor Q3, a DC bias is applied to the transistor Q3, so that the transistor Q3 is immediately turned on. However, the DC bias is applied to the transistor Q4 only until the capacitor C1 is charged. Is in a non-conducting state due to a delay in the operation. Therefore, a current is supplied from the transistor Q3 to the base of the transistor Q2, and the combined resistance value of the bias resistors 84 and 86 connected to the base side of the transistor Q1 and the operating resistance of the diode and the diode connected to the collector of the transistor Q2. The collector current flows into the transistor Q2 due to the difference between the operating resistance and the transistor Q2, and the transistor Q2 is turned on. As a result, transistors Q1,
Since the base potential of Q4 drops to a value close to the ground potential, transistors Q1 and Q4 are turned off. Therefore, only the transistors Q2 and Q3 are turned on. Therefore, no current flows from the battery (+ B) to the relay coil 67B of the rear fog lamp relay 67 via the relay contact 68A of the tail lamp relay 68 because the transistor Q1 is non-conductive, and the rear fog lamp remains off. .

Therefore, the rear fog lamp lighting control device according to the embodiment of the present invention can prevent forgetting to turn off the rear fog lamp as in the conventional device.

At time T6, the switch 62 is once operated to switch from the position where the movable contact 62A is in contact with both the fixed contact 62B and the fixed contact 62C to another switching position, and again at time T7. When the switch 62 is operated so as to switch the movable contact 62A to a position where the movable contact 62A contacts both the fixed contacts 62B and 62C, the operating conditions at the time T3 are exactly the same.
A duplicate description will be omitted.

At time T8, the movable contact 6 of the switch 60
When 0A is switched to a position where it contacts both the fixed contact 60B and the fixed contact 60C, the tail lamp 69 is turned on, and a current flows from the battery (+ B) to the relay coil 64B of the head lamp relay 64, and a head not shown. The lamp lights up. The movable contact 60 of the switch 60
The state in which A is switched to a position where it contacts both the fixed contact 60B and the fixed contact 60C means that the movable contact 60A is
Since the circuit operation is the same as the state where the switch is made to the position where only B contacts, the description of this point is also omitted.

According to the rear fog lamp lighting control device according to the embodiment of the present invention, the tail lamp switch and the head lamp switch are constituted by a single switch 60, and the front fog lamp switch and the rear fog lamp switch are constituted by a single switch. Since the switch 62 is used, the number of components can be reduced and the circuit configuration can be simplified.

[0032]

As described above, according to the first aspect of the present invention, the front fog lamp switch and the rear fog lamp switch which are independently provided in the conventional device are constituted by a single switch, and the rear fog lamp switch is provided. Since the circuit is configured to satisfy the operating conditions, the number of parts can be reduced and the circuit configuration can be simplified.

[Brief description of the drawings]

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

FIG. 2 is a timing chart for explaining the operation of the rear fog lamp lighting control device shown in FIG. 1;

FIG. 3 is a circuit diagram showing a configuration of a conventional rear fog lamp lighting control device.

[Explanation of symbols]

 Reference Signs List 50 rear fog lamp lighting control device 60 switch 62 switch 64 head lamp relay 66 front fog lamp relay 67 rear fog lamp relay 68 tail lamp relay 70 control circuit

Claims (1)

[Claims] 1. A first switch means for supplying power to the control means, a first switching position for lighting only the front fog lamp, and a second switching position for lighting the front fog lamp and the rear fog lamp. And a control means for controlling lighting of a rear fog lamp based on operation outputs of the first switch means and the second switch means, wherein the control means comprises a first switch. The rear fog lamp is turned on when the device is switched to the ON state and the second switch device is switched to the second switching position, and the second switch device remains switched to the second switching position. When the first switch is turned off in the state of the above, the rear fog lamp is turned off, and then the first switch is turned off. Even if the rear fog lamp is switched to the ON state, the rear fog lamp is turned off unless the second switch is temporarily switched from the second switching position to another switching position and then to the second switching position again. A rear fog lamp lighting control device, which controls so as to remain in a state.