JP3058712B2 - Vehicle interior lighting circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle interior lighting circuit for controlling vehicle interior lighting (room lamp) according to the state of a door and a door lock.

[0002]

2. Description of the Related Art Heretofore, it has been practiced to turn on / off the vehicle interior lighting in conjunction with opening / closing of a door and door locking. That is, when it is detected that all the doors are closed, the room lamp is automatically turned off after a predetermined time has elapsed, and when all the doors are closed and all the doors are locked, the room lamp is turned off immediately. Was. According to this method, the open / closed state of the door and the locked state of the door can be determined based on the turning-on / off state of the room lamp.

[0003] A conventional vehicle interior lighting circuit will be described with reference to FIGS. 4 and 5. FIG. 4 is a block diagram of a vehicle interior lighting circuit, wherein a door open / close detection switch 1 is shown.
The control circuit 30 controls the turning on and off of the room lamp 20 in accordance with 0 and the door close signal and the door lock signal from the door lock detection switch 12.

The control circuit 30 receives a door close signal from the door open / close detection switch 10 to turn off the room lamp 20 after a lapse of a predetermined time after the door is closed. A room lamp timer control circuit 32 for outputting is provided. On the other hand, the door open / close detection switch 1
0 and a signal from the door lock detection switch 12 are input, and an OR gate 34 for outputting a lighting cutoff signal is provided.

In order to turn off the room lamp 20 in response to the signals from the room lamp timer control circuit 32 and the OR gate 34, a signal from the room lamp timer control circuit 32 and the OR gate 34 is input, and a signal for turning off the light is output. An AND gate 36 for outputting a signal, a fade-out control circuit 38 for outputting an ON / OFF control signal for the transistor in accordance with a signal from the AND gate 36, and a transistor 40 for controlling the ON / OFF of the room lamp 20 are provided.

Here, the fade-out control circuit 38
This is a circuit for gradually turning off (fading out) the room lamp. Further, in this example, the door open / close detection switch 10 and the door lock detection switch 12 are shown one by one, but they are actually provided for each door, and when all the doors are closed and when all the doors are closed. Are output when the is locked.

Next, the operation of this circuit will be described with reference to FIG. First, when the door is closed, a door close signal L is output, and the room lamp timer control circuit 3
2 recognizes this, and after a lapse of a predetermined time, the AND gate 36
Is supplied with an L signal. As a result, the fade-out control circuit 38 turns off the transistor 40, and the room lamp 20 is turned off.

On the other hand, when all the doors are closed and locked, the door open / close switch 10 is turned on, and the door lock detection switch 12 is also turned on. The signal is input to the OR circuit 34. Therefore, this OR gate 34
Outputs an L signal. Therefore, the AND gate 36
Regardless of the output from the room lamp timer control circuit 32,
L is output, and the transistor 40 is turned off. Therefore, when all the doors are closed and all the doors are locked, the room lamp 20 is turned off instantly, and when all the doors are simply closed, the room lamp 20 is turned off after a lapse of a predetermined time. It will be. Thus, when the driver locks the doors and leaves the vehicle, it is possible to determine whether or not all the doors are locked based on the timing of turning off the room lamp 20.

[0009]

However, in the above-mentioned conventional example, there is a possibility that a malfunction may occur during a keyless lock operation or the like. That is, in the keyless lock operation, for example, all the doors are locked by operating the lock lever in a state where the driver's seat side door is released. Thereafter, all the doors are locked by closing the doors while pulling the door handle. Here, when closing the door while pulling the handle of the door, the door may be closed in a state where the handle is separated and the handle returns, and locking may fail. In this case, the driver's door is unlocked. At this time, the output signal of the door lock detection switch 12 changes from L to H by releasing the door lock. On the other hand, the door close signal becomes L when all the doors are closed. However,
The order of turning on and off the door lock detection switch 12 and the door opening / closing switch 10 at this time is not constant due to variations in the door lock mechanism, the accuracy in assembling the body, and the like. Then, as shown in FIG. 5, when L → H of the door lock signal is later than H → L of the door close signal, both signals become L, and the OR gate 34 outputs L.
Therefore, the transistor 40 is turned off by the L output of the OR gate 34, and the room lamp 20 is turned off immediately after the door is closed. Therefore, there is a problem that the room lamp is turned off immediately even though all the doors are not locked.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a vehicle interior lighting circuit capable of performing control of turning on and off a room lamp without malfunction.

[0011]

A vehicle interior lighting circuit according to the present invention comprises a door lock switch for outputting a door lock signal indicating whether or not a door is locked, and a door close signal for indicating whether the door is open or closed. A door open / close switch to be output, a door lock signal and a door close signal are input, and a shutoff circuit for turning off the vehicle interior lighting when the door is locked and the door is closed; And a signal delay circuit inserted and disposed at

[0012]

The vehicle interior lighting control circuit according to the present invention has the above-described configuration, and has a signal delay circuit on an input path through which a door close signal is input to the shutoff circuit. For this reason, the timing at which the door close signal is input to the shutoff circuit is delayed by a certain time. Therefore, it is possible to prevent a malfunction when the door is unlocked when the door is closed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle interior lighting control circuit according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration of the embodiment, and FIG. 2 is a timing chart showing the operation thereof.
As described above, the delay circuit 50 is inserted and arranged on the input path of the door close signal from the door open / close switch 10 to the OR gate 34. Therefore, as shown in FIG. 2, the change from H to L of the signal from the door open / close detection switch 10 input to the OR circuit 34 is delayed. That is, as shown by the solid line in FIG.
Is changed, the signal input to the OR gate 34 via the delay circuit 50 is equal to T as indicated by the broken line.
Only slow. Therefore, L is not input to the two inputs of the OR gate 34, and the malfunction as described above does not occur.

Accordingly, when the door is removed from the handle of the door during keyless locking and the door is closed in the unlocked state, the room lamp 20 is controlled by the timer control circuit 32.
Until the time is up, the driver or the like can recognize that the vehicle is not locked.
In addition, since the delay time T is about 100 to 200 msec, the user does not feel uncomfortable with the light-off delay.

Here, an example of the delay circuit 50 is shown in FIG. The output from the door open / close detection switch 10 is input to the base of the transistor 52, and the collector of the transistor 52 is connected to the base of the transistor 54. The collector side of the transistor 54 is an output terminal to the OR gate 34. The base of the transistor 54 is connected to a capacitor 56 whose other end is connected to the ground. Therefore, when the door open / close detection switch 10 is off and the door is open, H is input to the transistor 52 and the transistor 52 is on. Therefore, the collector side of the transistor 52 becomes L, and the transistor 54 is off. Therefore, the output is in the H state.

When the door open / close switch 10 is turned on and the transistor 52 is turned off, the collector side of the transistor 52 becomes H, the transistor 54 turns on and the output changes to L. Is delayed by the capacitor 56.
Therefore, the operation delay as described above is achieved. The delay time T can be adjusted by adjusting the capacitance of the capacitor 56 or the like.

Note that the delay circuit 50 is not limited to this configuration, and can take various known configurations.

[0019]

As described above, according to the vehicle interior lighting control circuit according to the present invention, since the delay circuit is provided, it is possible to effectively prevent a malfunction occurring at the time of the keyless lock operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of a vehicle interior lighting control circuit according to an embodiment of the present invention.

FIG. 2 is a timing chart illustrating the operation of the embodiment.

FIG. 3 is a circuit diagram showing a configuration example of a delay circuit of the embodiment.

FIG. 4 is a block diagram showing a configuration example of a conventional vehicle interior lighting control circuit.

FIG. 5 is a timing chart for explaining the operation of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Door open / close detection switch 12 Door lock detection 20 Room lamp 30 Interior lighting control circuit 32 Room lamp timer control circuit 34 OR gate 40 Transistor 50 Delay circuit

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tatsumi Tashiro 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Toshio Shinohara 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Koichi Sugiyama 3rd Iyama, Shinomecho, Anjo, Aichi Prefecture Inside Anden Corporation (72) Inventor Shinichiro Takahashi 1-1-3 Shimaya, Konohana-ku, Osaka Sumitomo Electric Industries, Ltd. (56) References Opened Sho 62-225443 (JP, A) Opened Sho 62-83746 (JP, U) Opened Sho 58-37697 (JP, U) Opened Sho 63-195943 (JP, U) (58) Int.Cl. ⁷ , DB name) B60Q 3/02

Claims (1)

(57) [Claims] A door lock switch for outputting a door lock signal indicating whether or not the door is locked; a door open / close switch for outputting a door close signal indicating an open / closed state of the door; a door lock signal and a door close signal Is entered, the door is locked and the door is closed,
A vehicle interior lighting control circuit comprising: a blocking circuit for turning off vehicle interior lighting; and a signal delay circuit inserted and arranged in an input path to a door closing signal blocking circuit.