JPH0367890B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a room lamp control device for an automobile, etc., which is equipped with a so-called delayed light-off function in which the room lamp is turned off after a certain predetermined period of time has elapsed after the door of the automobile is closed. Regarding.

(Summary of the Invention) The present invention enables the delayed extinguishing time of the interior lamp to be switched in two ways, long or short, depending on whether the driver gets into the car or gets out of the car after the engine stops. .

(Prior art and its problems) Room lamps in automobiles, etc. can usually be turned on and off by turning a manual switch on and off, and can also be turned on and off in conjunction with the opening and closing of a door. I'm starting to be able to do it.

Here, regarding the case where the light turns on and off in conjunction with the opening and closing of the door, generally speaking, the room lamp turns on immediately when the door is opened, and turns off immediately when the door is closed. For example, in order to be able to inspect the inside of the vehicle even after the door is closed, the interior lamp is left on even after the door is closed, and the interior lamp is turned on after a predetermined period of time has elapsed. make the lights go out,
A so-called delayed light-off function is being considered.

An example of a room lamp control device having this delayed light-off function is shown in FIG. The delayed light-off operation of this room lamp control device a will be explained. First, when the door is closed while the ignition switch b is off, the door switch c is turned off. In response to this, a delayed light-off signal having a predetermined pulse width is output from the delayed signal output circuit d, and this delayed light-off signal is applied to the base of the switching transistor f via the AND circuit e. As a result, the switching transistor f turns on, causing the room lamp g to continue to be lit even after the door is closed, and after being lit for a time equal to the pulse width of the delayed light-off signal, the room lamp g is turned off.

Note that conventionally, in order to take enough time to inspect the room, the delay time from when the room lamp is turned on until it is turned off is generally set to be long.

In the case of this conventional room lamp control device, when the door is closed, it operates regardless of whether the door is opened or closed when exiting the vehicle or when entering the vehicle.

However, while the above-mentioned delayed turn-off function of the room lamp is convenient for inspecting the interior of the vehicle when getting into the vehicle, it can also be inconvenient depending on the situation when getting off the vehicle or getting on the vehicle.

In other words, if the delayed turn-off function of the room lamp is activated when the driver gets into the car,
Even if the interior lamp is turned on for a long time due to this function, there is no problem because the driver is inside the vehicle, but the delayed extinguishing function of the interior lamp was activated when the driver left the vehicle and exited the vehicle. In some cases, the room lamps do not turn off for a while after the door is closed, leading to the illusion that the lamps have been turned off and causing the driver to return to the car.
Or even if you know that the lights will turn off automatically,
I get so anxious that I can't leave the car until the interior lights are completely turned off.

(Objective of the Invention) The present invention has been made in view of the above circumstances, and it is an object of the present invention to determine whether the interior lamp is turned on in response to the operation of the driver when the driver gets into the vehicle or when the driver exits the vehicle. To solve the conventional problems by automatically switching the delayed extinguishing time of a room lamp into two ways, long or short, by sensing the situation.

(Structure and effects of the invention) In order to achieve such an object, the present invention has the following features:
It has the following structure.

The room lamp control device of the present invention includes a switching means for turning on or off the room lamp in response to opening/closing of the door, and a switching means for turning on or off the room lamp in response to opening/closing of the door, and determining whether the door is opened/closed after the engine is stopped when getting into the vehicle. a first calculation signal when the situation determination means determines that the driver has alighted from the vehicle; a signal output means for outputting two operation signals, and the first
A first delayed light-off signal that turns off the room lamp with a short delay when the calculation signal is applied is transmitted to the second delayed light-off signal.
a delayed light-off time setting means for respectively outputting a second delayed light-off signal for turning off the room lamp with a long delay when the calculation signal is applied;
and a control means for controlling the timing of turning off the room lamp by the switching means in response to each delayed light-off signal.

Therefore, according to the present invention, it is possible to detect whether the door is opened and closed when getting on the vehicle or when exiting the vehicle, and then adjust the delayed extinguishing time of the room lamp to be longer or shorter. It can be switched automatically according to the street. In other words, when exiting the vehicle, the lighting time of the interior lamp after the door is closed is made relatively short, so the driver is not held up unnecessarily, and when getting into the vehicle, the lighting time of the interior lamp after the door is closed is lengthened. Therefore, the interior of the vehicle can be inspected thoroughly and conveniently.

(Description of Examples) Hereinafter, the present invention will be described in detail based on examples shown in the drawings.

FIG. 1 is a circuit configuration diagram of a room lamp control device for an automobile or the like according to an embodiment of the present invention. In the figure, 1 is a room lamp control device, 2 is a door switch, 4 is an ignition switch, 6 is a pulse output circuit, 8 is an inverter, 10 is a differential circuit,
12 is the first AND circuit, 14 is the latch circuit, 16
18 is a first delay signal output circuit, 20 is a second delay signal output circuit, 22 is an OR circuit, 24 is a second AND circuit, 26 is a switching transistor, 28 is a room lamp, 30 ，
Both 31 indicate input terminals of the power supply voltage +Vcc.

In this embodiment, the time from when the engine is stopped to when the door is opened is used to determine whether the door was opened and closed when exiting the vehicle or when entering the vehicle. It is configured to do so. In other words, when exiting the vehicle, the time from stopping the engine to opening the door is relatively short. On the other hand, when getting into the vehicle, the engine has already stopped and only the door can be opened, so if the time when the engine is stopped is taken as the starting point, the time from stopping the engine to opening the door will be longer than when getting off the vehicle. Focusing on this, in this embodiment, a certain set time is determined based on the time generally required from the engine stop to the door opening when exiting the vehicle, and this set time and the time from the actual engine stop to the door opening are determined. By comparing the time for the latter, if the latter time is shorter than the former, it is determined that the opening/closing of the door is when exiting the vehicle, and if the latter time is longer than the former, it is uniquely determined that the opening/closing of the door is for when the vehicle is getting in. .

Each of the above configurations will be specifically explained below.

The door switch 2 is turned on and off in conjunction with the opening and closing of the door of the automobile, and is turned on when the door is opened and turned off when the door is closed.

The ignition switch 4 is turned on when the engine is started with the ignition key, and turned off when the engine is stopped.

The pulse output circuit 6 is composed of a monostable multivibrator or the like that outputs a high-level timer signal for a predetermined period T ₀ in response to the ignition switch 4 being turned off. The period T ₀ is set (for example, 10 seconds) based on the average time required from stopping the engine to opening the door when exiting the vehicle.

The inverter 8 inverts the low level signal output when the door switch 2 is turned on.

The differentiating circuit 10 differentiates the rising edge of the output signal from the inverter 8.

The door switch 2, ignition switch 4, pulse output circuit 6, inverter 8, and differential circuit 10 described above also constitute the situation determining means set forth in the claims.

The first AND circuit 12 generates a high level signal (first calculation signal) or a low level signal (second calculation signal) based on the AND of the differential signal from the differentiation circuit 10 and the timer signal from the pulse output circuit 6. signal)
, respectively, and corresponds to the signal output means described in the claims. In other words, the period during which the timer signal is output from the pulse output circuit 6
When door switch 2 is turned on within T ₀ ,
That is, the first calculation signal is output when the door is opened when getting off the vehicle, and the second calculation signal is output when the door switch 2 is turned on outside the period _T0 , that is, when the door is opened or when getting into the vehicle. Ru.

The latch circuit 14 latches the signal output of the first AND circuit 12, and is composed of, for example, an R/S flip-flop.

The delayed light-off time setting means 16 includes a first delayed signal output circuit 18 , a second delayed signal output circuit 20 , and an OR circuit 22 . A first delayed light-off signal that turns off the room lamp 28 with a short delay when the calculation signal is given, and a second delayed light-off signal that turns off the room lamp 28 with a long delay when the second calculation signal is given. This is what is output. The first delayed signal output circuit 18 delays the timing of switching from low level to high level by a predetermined time (for example, 3 seconds) in response to a signal output when the door switch 2 is turned off, and outputs a second delayed signal. The circuit 20 delays the switching timing from a low level to a high level by a predetermined time (for example, 10 seconds) in response to a signal output when the door switch 2 is turned off.
generates a low-level or high-level signal (first and second delayed light-off signals) based on the logical sum of low-level or high-level output signals provided from the first and second delayed signal output circuits 18 and 20. This is what is output.

The second AND circuit 24 receives the output signal from the OR circuit 22 and the ignition switch 4.
The switching operation of the switching transistor 26 is controlled based on the AND with the output signal when the switching transistor 26 is turned on or off, and corresponds to the control means described in the claims.

The switching transistor 26 turns on and off the room lamp 28 in response to the output signal given from the second AND circuit 24, and corresponds to the switching means described in the claims.

Next, regarding the control operation of the room lamp 28,
This will be explained with reference to FIGS. 2 and 3.

When the ignition switch 4 is turned off to stop the car engine, the pulse output circuit 6
Since the input terminal of drops to the ground level, the pulse output circuit 6 outputs a high-level timer signal for a predetermined period T ₀ (for example, 10 seconds) in response to this, and
It is applied to one input terminal 12a of the first AND circuit 12. This opens the gate of the first AND circuit 12. Furthermore, when the ignition switch 4 is turned off, a low level signal is input to one inverting input terminal 24a of the second AND circuit 24. Note that this state continues until the ignition switch 4 is turned on.

Therefore, as shown in FIG. 2, when the door is opened and the door switch 2 is turned on during the period _T0 during which the timer signal is output, a low level signal is sent to the first delay signal output circuit 18 and the inverter. 8 respectively. In response to this signal, the first
While the output of the delayed signal output circuit 18 is inverted from high level to low level, the inverter 8 inverts the low level signal and outputs it to the next stage differentiating circuit 1.
Enter 0. The short pulse high-level differential output from the differentiating circuit 10 is applied to the other input terminal 12b of the first AND circuit 12. At this time, since the gate of the first AND circuit 12 has already been opened by the signal from the pulse output circuit 6, the differential output passes through the first AND circuit 12 and is output as the first calculation signal, and the latch is It is input to the set input terminal 14a of the circuit 14 and latched.
As a result, it is assumed that the door is opened when the vehicle exits the vehicle, and the latched first calculation signal is applied to the output prohibition input terminal 20a of the second delay signal output circuit 20 of the delayed light-off time setting means 16. . The signal output of the second delayed signal output circuit 20 is always set to a high level by this high-level first calculation signal, and this signal is applied to one inverting input terminal 22a of the OR circuit 22. On the other hand, since the first delayed signal output circuit 18 has already applied a low level signal to the other inverting input terminal 22b of the OR circuit 22 by turning on the door switch 2, the inverting output terminal of the OR circuit 22 A low level signal is output, and the second AND circuit 24
A low level signal is applied to the other inverting input terminal 24b. Since a low level signal is already applied to one inverting input terminal 24a of the second AND circuit 24 when the ignition switch 4 is turned off as described above, the second AND circuit 24
, a high level signal is applied to the base of the switching transistor 26. In this way, the switching transistor 26 becomes conductive, and the room lamp 2
8 lights up. In other words, the room lamp 28 continues to be lit while the door is open. Thereafter, when the door is closed and the door switch 2 is turned off after a predetermined period of time has elapsed since the door was opened, the first delay signal output circuit 18 outputs a first delay time (short time, e.g. It maintains the low level until 3sec) has elapsed, and then switches to the high level. Therefore, even if the door is closed, the room lamp 2
8 remains lit for 3 seconds. And the first
When the output of the delayed signal output circuit 18 becomes high level, the inverted output of the OR circuit 22 becomes high level, and then the output of the first AND circuit 24 becomes low level, so the switching transistor 26 becomes non-conductive, and the room lamp 28 becomes non-conductive. The light goes out with a delay. Note that since the output signal of the OR circuit 22 is also applied to the reset terminal 14b of the latch circuit 14, the latch circuit 1
4 cancels the inhibition of the operation of the second delay signal output circuit 20.

Next, as shown in FIG. 3, after the timer signal is output from the ignition switch ₄ turned off, the output signal of the pulse output circuit 6 has already become low level. Since the gate of the first AND circuit 12 is closed, even if the door is opened and a differential output is generated from the differential circuit 10, it is not applied to the latch circuit 14. Therefore, the latch circuit 14 is not set, and the second delay signal output circuit 20 is in the state where the operation inhibition is released. Therefore, if you open the door after the above period T ₀ has elapsed,
In response to this, the first delay signal output circuit 18 and the second
Both outputs of the delayed signal output circuit 20 are inverted to low level, and as a result, the room lamp 28 is turned on. After this, when the door is closed and the door switch 2 is turned off, the first delay signal output circuit 18
The operation is the same as that shown in the figure, but the output of the second delay signal output circuit 20 is maintained at a low level for a second delay time (10 seconds) after the door is closed. For this reason, the room lamp 28 is turned off 10 minutes after the door is closed.
The light will continue to turn on for only a second. After the period has elapsed, the second delayed signal output circuit 20 applies a high-level signal to one inverting input terminal 22a of the OR circuit 22, thereby rendering the switching transistor 26 non-conductive via the first AND circuit 24. , the room lamp 28 is turned off with a delay.

As explained above, in this embodiment, by determining whether or not the door switch 2 is turned on before a predetermined set time elapses after the ignition switch 4 is turned off, the driver can exit the vehicle. Since the ignition switch 4 is turned off, the door switch 2 is turned off after the timer signal output period _T0 has elapsed even slightly.
If turned on, it is treated as if the door was opened when entering the vehicle.

Incidentally, in the above embodiment, the timer signal output period T ₀ is set to 10 seconds based on the average time required for the driver to exit the vehicle after stopping the engine. However, it goes without saying that this period T ₀ can be set as appropriate.

Furthermore, in the embodiment described above, the determination of whether the driver exits or gets into the vehicle is made by the ignition switch 4 and the door switch 2, but the present invention is not limited to this. 2, it is also possible to implement it, for example, as a seat switch provided on the driver's seat.

[Brief explanation of drawings]

1 to 3 relate to an embodiment of the present invention, in which FIG. 1 is a circuit diagram of a room lamp control device, and FIGS. This is a timing chart for explaining the operation. Moreover, FIG. 4 is a circuit configuration diagram of a room lamp control device according to a conventional example. DESCRIPTION OF SYMBOLS 1... Room lamp control device, 2... Door switch, 4... Ignition switch, 6... Pulse output circuit, 8... Inverter, 10... Differential circuit, 12... First AND circuit, 16... Delayed light-off time setting means, 24...Second AND circuit, 26
...Switching transistor, 28...Room lamp.

Claims (1)

[Scope of Claims] 1. Switching means for turning on or off a room lamp in response to opening and closing of a door, and whether the opening and closing of the door after the engine is stopped is performed when exiting the vehicle or when getting into the vehicle. a first calculation signal when the situation determination means determines that the driver has alighted from the vehicle, and a second calculation signal when it determines that the driver has gotten into the vehicle. a first delayed light-off signal that turns off the room lamp with a short delay when the first calculation signal is applied, and a signal output means that outputs a first delayed light-off signal that turns off the room lamp with a short delay when the second calculation signal is applied; a delayed light-off time setting means for respectively outputting a second delayed light-off signal for time-delayed light-off time; and a delayed light-off time setting means for respectively outputting a second delayed light-off signal to turn off the light with a time delay; 1. A room lamp control device for an automobile, etc., comprising a control means for controlling.