JPS6324027Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic light extinguishing device for headlights, etc., and particularly to an automatic light extinguishing device suitable for use when driving in a tunnel.

As is well known, automobiles have a switch that turns on the headlights or small lamps, and when driving at night or in a tunnel, the switch is operated to turn on the headlights or small lamps.

By the way, there is no problem at night, but during the daytime, after driving through a tunnel, I sometimes forget to turn off the small lamps and headlights. Forgetting to turn off such lights or lamps results in power loss and shortens the life of the lights or lamps. Therefore,
Devices are being considered that completely automate the blinking of lights or lamps. However, such automated light flashing devices are dangerous because they are configured to turn on the lights after the car enters the tunnel, and they are also dangerous because they are configured to turn on the lights depending on the brightness outside the vehicle. The drawback is that the illuminance settings are unavoidably delicate.

From the above, the present invention can reliably turn off the lights after driving in a tunnel, and can also turn on the lights based on the driver's judgment before entering the tunnel.Furthermore, the present invention is easy to operate and allows for less dangerous driving. One object of the present invention is to provide an automatic light extinguishing device that is capable of extinguishing lights.

Another object of the present invention is to provide an automatic light extinguishing device that allows illuminance to be set with sufficient margin.

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

Fig. 1 is a circuit block diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram of a lamp switch that manually controls the blinking of the light, and Fig. 3 is an explanatory diagram of the assembled state of the lamp switch and blinking instruction switch. be.

In the figure, 101 is a battery, 102 is a key switch contact, and 103 is a switching contact for semi-automatic mode/manual mode switching. In addition, manual mode is a normal mode in which the small lamp and headlight are turned on and off completely manually.
The semi-automatic mode is a mode in which the headlights are turned on by operating a blinking switch, which will be described later, and turned off automatically by detecting the brightness outside the vehicle. Further, this switching contact 103 is switched by a lamp switch that turns on and off the small lamp and head lamp in the manual mode. That is, as shown in Fig. 2, there are two types of lamp switches: a rotary type (Fig. 2 a) and a push type (Fig. 2 b). When this lamp switch is placed in the off position, both the headlight and the small lamp are turned off. The mode can be switched from manual mode to semi-automatic mode. Reference numeral 104 denotes a blinking instruction switch for instructing the lighting of the headlight in the semi-automatic mode, and its operation section 104a is integrated with a rotary lamp switch operation dial DS, as shown in FIG. 3, for example. In addition, the blinking instruction switch 104 is a normally open type,
It closes only when the operating portion 104a is pressed, and returns to its original state when the pressing force is released. Although not shown, when the lamp switch is not a rotary type but a push type, the operating section 104a may be integrated as a rotary operating section. The configuration is such that a lighting setting signal is output. 105 is a T-type flip-flop. A T-type flip-flop inverts its memory state every time a logic "1" (high level) signal is generated at the T input (point B), and a logic "1" pulse is generated at the clear terminal (point D). The storage state is reset (Q=“0”,=“1”) every time. 106 is an amplifier, which is composed of Darlington-connected transistors Tr ₁ and Tr ₂ and transistor Tr ₃ .
It constitutes a stage amplifier circuit. Note that R ₁ to R ₃ are resistances. 107 is a headlight, 108 is a light drive unit for driving the headlight, and amplifier 1
Relay coil 108a and relay contact 108 connected in series to transistor Tr ₃ of the output stage of 06
b. It has a spark killer diode 108c. Relay contact 108b is headlight 1
07 in series. Therefore, when the Q output of the T-type flip-flop becomes "1", the transistor _Tr3 becomes conductive, current flows through the relay coil 108a, and the relay contact 108b is turned on. As a result, in the semi-automatic mode, a current closed circuit is formed along the route of battery→relay contact 108b→headlight 107→earth, and headlight 107 lights up. Note that 110 is mounted on the front panel of the vehicle, and in semi-automatic mode, the headlight 107
This is a pilot lamp that indicates whether or not the headlight 107 is lit and is connected in parallel to the headlight 107. However, this pilot lamp 110 does not necessarily need to be connected in parallel with the headlight 107, but may be connected in series with the transistor _Tr3 . 111 is a chattering prevention circuit which prevents malfunction of the T-type flip-flop 105 due to the chattering of the flashing instruction switch 104, and includes a latch circuit LAT, a not gate NOT, a resistor R ₄ ,
Consists of _R5 . That is, the chattering prevention circuit 111 outputs "1" to its output terminal (point B) only when the blinking instruction switch 104 is pressed. 112 is an initial setting circuit that initializes the state of the T-type flip-flop 105 to Q="0" and "1" when the key switch contact 102 is closed or when the mode is changed from manual mode to semi-automatic mode; It consists of a delay circuit consisting of resistors R ₆ , R ₇ , R ₈ and a capacitor C ₁ and a Schmitt circuit SHM ₁ for waveform shaping. That is, when the key switch contact 102 is closed or set to semi-automatic mode, the initial setting circuit 112 outputs the initial setting signal ICS of logic "1" to its output terminal (point A) after a predetermined delay time has elapsed. and,
This initial setting signal ICS is pulsed by a differentiating circuit at the subsequent stage and inputted to the clear terminal of the T-type flip-flop 105, and the state of the T-type flip-flop is initialized to Q="0" and "1". 113
is a detection circuit that detects the illuminance outside the vehicle, and includes an illuminance detection element 113a using a cadmium sulfide (CdS) cell or the like to detect the brightness outside the vehicle, a variable resistor 113b for illuminance setting, a resistor _R9 , and a transistor Tr. The amplifying section 113c consists of _four amplifying sections. Cadmium sulfide cells generally have the characteristic that the resistance value decreases when the light gets brighter, and the resistance value increases when the light gets darker. Therefore, if the resistance value of the variable resistor 113b is set to an appropriate value, when the brightness outside the vehicle reaches a predetermined level, that is, when the brightness changes from dark to bright, the transistor Tr ₄ becomes non-conductive, and vice versa. When the light changes from bright to dark, it becomes conductive. It is preferable that the cadmium sulfide cell be placed in a location where it will not be affected by the headlights of an oncoming vehicle, such as on the ceiling of the vehicle. 114 is a delay circuit section consisting of a resistor _R10 and a capacitor _C2 ;
It consists of a Schmitt circuit SHM2 for waveform shaping. When the outside of the vehicle is bright, the transistor Tr ₄ of the detection circuit 113 is in a non-conductive state, so the capacitor C ₂ is charged, and "1" appears at point C. However, when it gets dark outside the car, the transistor
Tr ₄ becomes conductive, the charge in the capacitor C ₂ is discharged through the resistor R ₁₀ and the transistor Tr ₄ , and "0" appears at point C. Therefore, when the car finishes passing through the tunnel in the daytime, the outside of the car changes from dark to bright, so the transistor Tr ₄ is turned off, and the capacitor 114c is charged with electric charge through the resistors R ₉ and R ₁₀ , and after the car completes passing through the tunnel. “1” appears at point C after a predetermined time has elapsed. Furthermore, by setting the discharge time constant of capacitor _C2 to be short and the charging time constant to be relatively long, even if the inside of the tunnel becomes temporarily bright, the cadmium sulfide cell will not be damaged by the headlights of an oncoming vehicle in the tunnel. Even if it is temporarily irradiated, "1" does not appear at point C. That is, "1" is output to point C only when the outside of the vehicle becomes brighter than a predetermined brightness for a predetermined period of time or longer. 11
5 is a differentiating circuit, which is connected to the output terminal (point A) of the initial setting circuit 112 or the output terminal (point C) of the delay circuit section 114.
When the level at point) changes from logic “0” to “1”, a differential operation is performed and a reset pulse is applied to point D.
Output RP. In addition, NOT is not gate,
NOR is Noah Gate, OR is Or Gate, C ₃ , C ₄
is a capacitor, and R ₁₁ and R ₁₄ are resistors.

Next, the operation of the circuit shown in FIG. 1 will be explained.

In the semi-automatic mode, in other words, when the switching contact 103 is switched to the semi-automatic mode, insert the key into the keyhole of the car and turn the key to operate the key switch contact 102, and the initial setting is completed. Capacitor of circuit 112
The terminal voltage of _C1 rises, and after a predetermined time, the initial setting signal ICS of logic "1" appears at the output terminal (point A). Differentiator circuit 115 differentiates this initial setting signal ICS and generates reset pulse RP at point D.
As a result, the state of the T-type flip-flop 105 is cleared to Q="0" and "1". The above operation is performed when the operation dial DS of the lamp switch shown in Fig. 3 is set to the off position OFF position, that is, the state shown in Fig. 2 a or the state shown in the upper part of Fig. 2 b, while the engine is starting. In other words, even when switching from manual mode to semi-automatic mode, the same operation is performed.

Now, in the state where the T-type flip-flop 105 is cleared as described above (Q="0"),
When a car approaches a tunnel during the day, the driver presses the operating section 104a of the flashing instruction switch 104. By pressing this blinking instruction switch 104, "1" appears at point B, and the state of the T-type flip-flop becomes Q="1", = "1".
When Q=“1”, the transistor of amplifier 106
Tr ₁ to Tr ₃ become conductive, and relay coil 10
8a is driven, and relay contact 108b is closed,
Headlight 107 and pilot lamp 110
lights up.

Thereafter, the vehicle enters the tunnel with the headlight 107 turned on and travels within the tunnel. Note that when the car enters a tunnel, the outside of the car changes from bright to dark, so the resistance value of the illuminance detection element 113a made of a cadmium sulfide cell increases, and the transistor Tr ₄ turns on. Then, due to the conduction of the transistor Tr ₄ , the charge accumulated in the capacitor C ₂ is rapidly discharged via the resistor R ₁₀ and the transistor Tr ₄ , and the potential at the point C becomes a low level (logic "0").

When the car completes running in the tunnel, the outside of the car changes from dark to bright, so the resistance value of the illuminance detection element 113a decreases and the transistor Tr ₄ turns off. As a result, the capacitor _C2 is charged with electric charge via the resistors _R9 and _R10 , and after a predetermined period of time, for example, several seconds, a tunnel passage completion signal TPE (= "1") is generated at point C.
appears. Next, the differentiating circuit 115 differentiates this tunnel passage completion signal from TPE, generates a reset pulse RP at point D, and clears the T-type flip-flop 105 to Q="0" and "1". Q
="0", the transistor Tr ₃ becomes non-conductive, the relay coil 108a is not driven, and the headlight 107 and pilot lamp 110 are turned off.

By the way, if you make the charging time constant of capacitor _C2 long and the discharging time constant short, even if the inside of the tunnel becomes temporarily bright, the cadmium sulfide cell will be temporarily illuminated by the headlights of an oncoming car inside the tunnel. Even if the tunnels are irradiated, the headlights 107 will not go out even if the distance between the tunnels is short and a car drives between them. For example, if a car arrives at the junction of two tunnels and the outside of the car becomes temporarily bright, the transistor Tr ₄ becomes temporarily non-conductive and the terminal voltage of the capacitor C ₂ gradually increases. However, if the car enters the next tunnel before the terminal voltage rises to such an extent that "1" appears at point C, transistor Tr ₄ turns on, the charge is discharged, and "1" appears at point C. does not appear, and the headlight 107 never goes out.

As described above, according to the present invention, it is possible to reliably turn off the lights after completing the journey inside the tunnel, and the structure is such that the lights are turned on based on the driver's judgment before entering the tunnel, allowing for less dangerous driving. . Furthermore, since the present invention is configured to delay the output of the detection circuit, the headlight will not turn off even if the inside of the tunnel becomes temporarily bright or the illuminance detection element is temporarily illuminated by the headlight. This reduces the risk of driving. Furthermore, since switching between manual and semi-automatic mode is linked to conventional operating mechanisms such as a lamp switch when manually operating lights on and off, there is no need for a special switching knob to select the automatic lights-off function. Furthermore, when the semi-automatic mode is selected, the headlight can be turned on by simply operating the lighting instruction switch integrated with the lamp switch, which, combined with the ease of switching between the manual/semi-automatic mode, further simplifies the operation. be able to. Furthermore, since it is applied when driving through a tunnel in the daytime, it is possible to make a large difference in brightness between the inside and outside of the tunnel, and the illuminance can be set using the variable resistor of the detection circuit with safety in mind, so there is no instability. Furthermore, since a pilot lamp is provided inside the vehicle that flashes in synchronization with the headlights, the flashing instruction switch can be operated while looking at the pilot lamp, resulting in good operability.

Although the present invention has been described in detail with reference to the embodiments, the present invention is not limited to the embodiments and can be modified in various ways.
For example, although FIG. 1 shows a case in which the circuit is constructed using C-MOSIC, it may be constructed using TTL or linear circuits as long as they have the same function. or,
Although a case has been described in which a cadmium sulfide cell is used as the illuminance detection element, other elements such as a phototransistor may also be used. Furthermore, although the embodiment describes the case where the headlight is controlled to blink, it is not limited to the headlight, but can also be applied to small lamps,
It can also be applied to blinking control of fog lamps, etc.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of a lamp switch, and FIG. 3 is an explanatory diagram of the arrangement of a lamp switch and a blinking instruction switch. 101... Battery, 102... Key switch contact, 103... Changeover switch contact, 104...
Flashing instruction switch, 105...T-type flip-flop, 106...amplifier, 107...headlight, 108...light drive section, 110...pilot lamp, 111...chattering prevention circuit,
112...Initial setting circuit, 113...Detection circuit,
113a... illuminance detection element, 114... delay circuit section, 115... differential circuit.

Claims (1)

[Scope of utility model registration request] The light can be turned on or off by a switching means that is linked to the flashing operation mechanism of the light, and an operation part integrated with this switching means, to switch between a semi-automatic mode in which the light is automatically turned off depending on the brightness outside the vehicle, and a manual mode in which the flashing control is manually controlled. a lighting instruction switch that instructs lighting and outputs a lighting setting signal; an initial setting means that detects that the switching means is in a semi-automatic mode and outputs an initial setting signal; illuminance detection means for detecting that the illuminance has decreased and outputting an illuminance detection signal after a delay of a predetermined time;
The lighting device is equipped with a storage means that is set by the lighting setting signal and reset by the initial setting signal or the illuminance detection signal, and a light drive section that turns on and off the light according to the storage state of the storage means, and is capable of operating in a semi-automatic mode. An automatic light extinguishing device characterized in that when the brightness outside the vehicle exceeds a predetermined brightness, the memory means is reset and the light is turned off.