JPH0329236Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an ignition switch lighting circuit, and is useful when used in conjunction with a small lamp forgetting to turn off alarm circuit.

<Prior Art> Modern automobiles are equipped with an ignition switch lighting circuit and a small lamp alarm circuit. The ignition switch lighting circuit is a circuit that illuminates the ignition switch when the door is opened, making it easier to enter the car and insert the key into the ignition switch when it is dark, such as at night. In addition, the forget-to-turn-off alarm system is a circuit that issues an alarm if the ignition switch is turned off with small side lamps or other small lamps on, and prevents passengers from exiting the vehicle with the headlights or small lamps still on.

A conventional technique incorporating this type of circuit will be explained with reference to FIG. In the figure, reference numeral 1 denotes a forget-to-turn-off alarm circuit, which is composed of a relay 2, a small lamp switch 3, a side lamp (small lamp) 4, an alarm drive device 5, and an alarm sound generator 6. Further, 7 is a battery, 8 is an ignition switch, and 16 is a meter panel light that illuminates the meter panel. When the small lamp switch 3 is turned on, the relay 2 is energized and turned ON, and the side marker lights 4 and meter panel lights 16 are turned on. When the side marker lights 4 are on, a closing signal 9 indicating that the small lamp switch is turned on is input to the warning drive device 5. When the ignition switch 8 is turned off in this state, the alarm driving device 5 passes current to the alarm sound generator 6, and an alarm is issued. In other words, if you forget to turn off the small lamp switch 3 and turn off the ignition switch 8 while trying to get out of the vehicle with the side marker lights 4 on, an alarm will be issued.
As a result, the driver knows that he has forgotten to turn off the vehicle width lights 4.

Furthermore, in FIG. 3, reference numeral 10 denotes an ignition switch lighting circuit, which is composed of a foot lamp 11, an ignition switch lamp 12, a control device 13, and a door sensor 14. Ignition switch light 1
2 is installed near the ignition switch 8 to illuminate it, or is built into the ignition switch 8 itself to display its location. Also footlight 11
illuminates the footwell of the driver's seat. Furthermore, door sensor 1
Reference numeral 4 detects the opening of the door and sends out a door open signal 15. For example, a courtesy switch which is closed when the door opens is employed. Therefore, when the door open signal 15 is input, the control device 13 controls the foot lamp 11 and the ignition switch lamp 1.
2 is made conductive for a certain period of time, and both are turned on for a certain period of time. Therefore, even when it is dark, such as at night, the ignition switch 8 is illuminated, making it easier to insert the key, and the area under the driver's feet is illuminated.

In the conventional circuit described above, when parking the vehicle at night and getting out of the vehicle, the driver first opens the small lamp switch 3 to turn off the width lights 4 and meter panel lights 16, and then turns on the ignition switch. 8 and place it in the OFF position.
The reason for doing this is that if the ignition switch 8 is opened first, an alarm will be issued.

However, in this conventional technology, the meter panel light 16 goes out at the same time as the small lamp switch 3 is turned off, so the interior of the car becomes dark at night, and the driver has to grope around to find the ignition switch 8 and turn it on. It's inconvenient because you have to turn it off and pull out the key. In other words, the ignition switch light 12 is of no use when exiting the vehicle. Naturally, if the driver's side door is opened after opening the small lamp 3, the door open signal 15 will be sent and the ignition switch light 12 will turn on, but such an operation is extremely unnatural and unsafe. There is a problem above. Furthermore, the possibility of locking the key inside the car increases.

In order to solve the above-mentioned problems, the applicant of the present invention proposed an ignition switch lighting circuit (see FIG. 4) disclosed in Japanese Patent Laid-Open No. 17430/1983. This ignition switch lighting circuit includes an ignition switch light 12 that illuminates the ignition switch 8, and a door sensor 1 that detects the opening of a door and sends out a door open signal 15.
4, and the ignition is turned off on the condition that the small lamp switch 3, which was turned on to supply power to the small lamp, is opened when the door open signal 15 is input or the ignition switch 8 is turned on. The ignition switch light 12 is energized, and the ignition switch light 12 is energized on the condition that a certain period of time has elapsed after the start of energization, or the ignition switch 8 that had been turned on is released. It is characterized by comprising a control device 13 for stopping the operation. In other words,
In this ignition switch lighting circuit, when exiting the vehicle, the condition is that while the ignition switch 8 is inserted, the small lamp switch 3 is opened and the input signal 9 is no longer input to the control device 13. At this time, the foot lamp 11 and the ignition switch lamp 12 are turned on, and the ignition switch 8 can be illuminated even when getting off the vehicle.

<Problems to be solved by the invention> By the way, in the ignition switch lighting circuit shown in FIG. Light 11 is turned off. For this reason, turn off ignition switch 8.
The inconvenience is that the inside of the car is completely dark because the foot lamp 11 and the ignition switch lamp 12 do not turn on after turning it off and before the key is removed and the door is opened, and the small lamp is also turned off in advance. It was hot.

This invention was made to solve the above problems, and when getting off the car, turn on the ignition switch,
To provide an ignition switch lighting circuit capable of lighting an ignition switch light for a certain period of time after the small lamp switch is turned off, regardless of whether it is turned off.

<Means for Solving the Problems> In order to solve the above problems, the ignition switch lighting circuit according to the present invention has an ignition switch lamp that illuminates the ignition switch, and a door opening/closing lamp. A door sensor is used to detect the door, and energization to the ignition switch lamp is started on the condition that the door sensor detects that the door is opened or a small lamp switch is opened, and the door close is detected by the door sensor. a lighting control logic circuit that stops energizing the ignition switch lamp on the condition that a predetermined period of time has elapsed or a predetermined period of time has elapsed after the small lamp switch is opened; The present invention is characterized by comprising a transistor that prevents the lighting control logic circuit from energizing the ignition switch lamp when the door sensor detects that the door is closed.

<Function> The lighting control logic circuit of the ignition switch lighting circuit according to the present invention allows the ignition to be turned off for a certain period of time after the small lamp switch is turned off, regardless of whether the ignition switch is turned on or off when exiting the vehicle. The switch light can be turned on, and when the transistor turns on the small lamp switch and the door sensor detects that the door is closed, the ignition switch light that has been turned on can be forcibly turned off.

<Example> Hereinafter, the present invention will be explained in detail with reference to an illustrated example.

FIG. 1 is a circuit diagram showing an embodiment of the present invention. As shown in this figure, is a forget-to-turn-off alarm circuit, which includes a small lamp 101, an alarm generation logic circuit 102, a transistor 103, and an alarm sound generator 104. Further, 105 is a small lamp switch, 106 is a relay, 107 is a battery, and 108 is an ignition switch.
Here, when the small lamp switch 105 is turned on, the relay 106 is excited and becomes energized. The small lamp 101 lights up. and,
When the small lamp switch 105 is turned on, a turn-on signal 109 (high level signal) is input to the alarm generation logic circuit 102 via line ₁ . Furthermore, when the ignition switch 108 is opened, an open signal 110 (low level signal) is input to the alarm generation logic circuit 102 via line ₂ . When the alarm generation logic circuit 102 receives the input signal 109 and the release signal 110, the alarm generation logic circuit 102 generates the alarm signal 11.
1 (high level signal) and transistor 1
03 conducts, thereby the alarm sound generator 104
to drive. In other words, small lamp switch 1
If the driver forgets to turn off the ignition switch 108 and turns off the ignition switch 108 while trying to exit the vehicle with the small lamp 101 on, an alarm will be issued, thereby letting the driver know that the driver has forgotten to turn off the small lamp 101.

Also, is an ignition switch lighting circuit, a door sensor 112, a lighting control logic circuit 11
3. Ignition switch light 114, transistor 115 for forced extinguishing, transistor 116 for driver of ignition switch light 114,
It has 117. The door sensor 112 detects the opening and closing of a door, and employs, for example, a courtesy switch that is closed when the door is opened. Transistor 115 has its base connected to the line
₃ , is connected to the small lamp switch 105 via the resistor 118 and the relay 106, and
It is connected to the door sensor 112 via line ₃ and diode 119, and the collector is connected to the lighting control logic 113 via line ₄ . Note that the alarm generation logic circuit 102 and the lighting control logic circuit 113 are integrally formed within the integrated circuit 120.

The lighting control logic circuit 113 outputs the energization signal 121 from the output terminal 113c under the following conditions (a), (b), and (c).
(high level signal).

(a) When the potential of the input terminal 113a is low level.

(b) A certain period of time has elapsed since the potential of the input terminal 113a changed from low level to high level.

(c) A certain period of time has elapsed since the potential of the input terminal 113b changed from low level to high level.

In cases other than the above (a), (b), and (c), the energization signal 121
is not output, and when this energization signal 121 is input to the transistor 116, the transistor 11
6, 117 becomes conductive, and the ignition switch light 114 lights up.

The transistor 115 becomes conductive when its base potential becomes high level, and becomes cut off when its base potential becomes low level. Therefore,
When the transistor 115 becomes conductive, even if the lighting control logic circuit 113 outputs the energization signal 121, the energization signal 121 is input to the transistor 115 via the line ₅ and the diode 122 and is grounded.

Next, the operation of this embodiment will be explained with reference to FIGS. 1 and 2.

(a) When riding (see Figure 2 a).

When you open the door to board the vehicle, the door sensor 112
is input, the line ₆ becomes the ground potential, the potential of the input terminal 113a becomes low level, and the above-mentioned condition A is satisfied. Power signal 1
21 is output, transistors 116 and 117 become conductive, and ignition switch lamp 114 lights up. After that, when you close the door, the door sensor 11
2 is open and line ₆ is powered by battery 107 via line ₇ , so input terminal 113
a changes from low level to high level. Therefore, the above-mentioned condition B is satisfied, and the energization signal 121 is not activated for a certain period of time t (about 5 seconds) after the door is closed.
is output and the ignition switch light 114
lights up and then goes out.

(b) When the small lamp switch 105 is turned on immediately after getting in the car and closing the door (Fig. 2b)
reference).

Similarly to a above, even if the door is closed, the energization signal 121 is output for a certain period of time t. However, if the small lamp switch 105 is turned on within a certain time t, the turn-on signal 1, which is a high level signal,
09 is applied to the base of transistor 115 through resistor 118 and line ₃ , making transistor 115 conductive. Therefore, the energization signal 121 is input to the transistor 115 via line ₅ and the diode 122 and is grounded, so the energization signal 121 is input to the transistor 116.
is no longer input, and the ignition switch light 114 goes out. In this way, when the door is closed, the door sensor 112 is opened, and when the small lamp switch 105 is turned on and the small lamp 101 is turned on, the energization signal 121 is cut off by the transistor 115, and the ignition switch turns on. 114 is turned off.

(c) When getting off the vehicle (see Figure 2c).

When the small lamp switch 105 is opened to turn off the small lamp 101, the input signal 1 is turned off.
Since 09 (high level signal) is not output, the transistor 115 becomes low level and becomes cut off. Also, since line ₈ is powered by battery 107 via line ₉ , input terminal 113b changes from low level to high level. Therefore, the above-mentioned condition C is satisfied and the fixed time t
(for about 5 seconds), the energization signal 121 is output and the ignition switch light 114 lights up.
Then the lights go out. In this way, until the ignition switch 108 is turned off, the key is removed, and the door is opened (within a certain period of time t).
The ignition light is on.

(d) When the small lamp switch 105 that was turned on is released while the vehicle is running (see Figure 2 d).

For example, if you enter a tunnel in the daytime and turn on the small lamp 101, etc., and then exit the tunnel and open the small lamp switch 105 to turn off the small lamp 101, the operation will be exactly the same as in the case of getting off the vehicle described above. do. That is, since the input signal 109 (high level signal) is not output, the transistor 115 becomes low level and becomes cut off. Also, line ₈
is supplied with power by the battery 107 via the line ₉ , so the input terminal 113b changes from low level to high level. Therefore, the condition C is satisfied, the energization signal 121 is output for a certain period of time t (about 5 seconds), and the ignition switch light 114 is turned on, and then turned off.

(e) In case d, the small lamp switch 105 is turned on again within a certain period of time t (see FIG. 2e).

When the small lamp switch 105 is turned on again, the turn-on signal 109 (high level signal) is passed through the resistor 118 and line ₃ to the transistor 1.
The transistor 115 is connected to the base of the transistor 115.
becomes conductive. Therefore, the energization signal 121
is input to transistor 115 via line ₅ and diode 122 and is grounded, so
The energization signal 121 is no longer input to the transistor 116, and the ignition switch light 114 is turned off. In this way, when the door is closed, the door sensor 112 is opened, and the small lamp switch 105 is turned on to turn on the small lamp 101.
As a result, the energizing signal 121 is cut off by the transistor 115 and the ignition switch light 114 is turned off.

<Effects of the invention> As explained in detail with the embodiments above, according to the invention, the lighting control logic circuit opens the small lamp switch when exiting the vehicle, regardless of whether the ignition switch is ON or OFF. Since the ignition switch light will be on for a certain period of time, the light can be illuminated even when the ignition switch is turned off and the key is removed.

In addition, when the small lamp switch is turned on and the door sensor detects that the door is closed, the transistor cuts off the energizing signal to the ignition switch light, turns off the ignition switch light instantly, and the small lamp Since the switch and the ignition switch are linked together, there is no need for both to be turned on at the same time, and necessary and sufficient illumination can be provided.

Furthermore, as mentioned above, when the small lamp switch is turned on and the door sensor detects that the door is closed, the operation of forcibly turning off the lit ignition switch lamp is performed by a transistor. Accordingly, the circuit configuration of the lighting control logic circuit becomes easier and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an ignition switch lighting circuit according to an embodiment of the present invention; FIG.
b, c, d, e, and f are all explanatory diagrams showing the operation of the present invention, and FIGS. 3 and 4 are circuit diagrams showing conventional ignition switch illumination circuits. In the drawing, 101 is a small lamp, 102 is an alarm generation logic circuit, 105 is a small lamp switch, 108 is an ignition switch, 112 is a door sensor, 113 is a lighting control logic circuit, 114
1 is an ignition switch, and 115 is a transistor.

Claims (1)

[Scope of utility model registration request] an ignition switch lamp that illuminates the ignition switch; a door sensor that detects whether the door is opened or closed; and a door sensor that illuminates the ignition switch; The ignition switch starts energizing the light, and on the condition that a certain period of time has elapsed after the door sensor detected that the door was closed, or a certain period of time had elapsed after the small lamp switch was opened. a lighting control logic circuit that stops energization;
An ignition switch lighting device comprising: a transistor that prevents the lighting control logic circuit from energizing the ignition switch lamp when the small lamp switch is turned on and the door sensor detects that the door is closed. circuit.