JPS60154928A - Single valve controller - Google Patents

Abstract

PURPOSE:To control the illuminance of stop, tail and parking indicating functions of single valve by controlling power supply to single valve on the basis of output from pulse oscillator. CONSTITUTION:A stop switch 3 is connected through an ignition switch 2 to a car mount battery 1 while tail switch (TA switch) 4 and parking switch (PA switch) 5 are connected in parallel to a battery 1. A seat sensor 6 will close a movable contact 6a to TA contact 6b upon seating of driver while close said contact 6a to PA contact 6c upon leaving of driver under stoppage of car. Control circuit 10 for controlling power supply to single valve 12 on the basis of the indicating function will vary the pulse width of pulse oscillator to vary the duty ratio thus to perform power supply control with correspondence to the output.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a control device for a single pulp (also referred to as a single filament valve) used as an automobile lamp, and in particular to a control device for a single filament (hereinafter referred to as a single filament). This invention relates to a single pulp control device that uses reflected light from a single bulb to fully variable control the illuminance level of each sign function using a single bulb that has light distribution characteristics according to the three sign functions of stop, tail, and parking. .

[Prior art]

In bulbs with a built-in two-horn filament that have been conventionally used as automotive lamps, the positions of the two filaments placed in one bulb chamber are different.
The relative position between each filament, the reflecting mirror, and the front lens tends to shift, and the light distribution characteristics tend to change slightly. Particularly in car body color lamps, if the light source position is shifted, the light will not be concentrated in the gap between the coatings between the lenses, causing a problem in which the luminous intensity will drop significantly.

For this reason, recently, a single pulp has been proposed that has three marking functions: stop, tail, and parking in a single filament. This single pulp corresponds to each stop, tail, and parking sign function by placing a single filament at the focal point of a parabolic reflector and emitting the reflected light from this filament through a predetermined lens system. It is configured to have light distribution characteristics. A single pulp having such a structure has the advantage that the relative positions of the single filament, the reflective surface, and the lens system can be precisely positioned, the decrease in luminous intensity is small, and the pulp can be made compact.

However, since the illuminance of each stop, tail, and parking area varies greatly depending on the purpose of use, a device for controlling the illuminance of these areas has been desired.

[Summary of the invention]

The present invention has been made in view of the above points, and its object is to control the illuminance of each single-pulp stop, tail and parking sign function by a simple configuration, and to control the illumination of each single-pulp stop, tail and parking sign function by a simple configuration, and to A single-valve control device that can switch the illuminance level to a lower level to reduce panteria consumption.
I'm going to provide t+.

In order to achieve such an object, the present invention provides a single pulp that utilizes all of the reflected light from a single filament and has light distribution characteristics according to the three sign functions of stop, tail, and parking, and a It is fully equipped with a control circuit that controls the illuminance and a detection means that detects whether the vehicle has stopped, and the control Oki 1 Road is based on the operation of three switches that respectively activate the stop, tail, and parking sign functions. A pulse oscillator that oscillates all pulses at a constant period, and this pulse oscillator! The output of the pulse oscillator is comprised of: a duty ratio variable means for varying the duty ratio by varying the pulse width of the oscillated pulse in accordance with the operation of each switch for operating each of the stop, tail and parking sign functions; To control the energization of the single pulp based on this! The IC changes the illuminance level in conjunction with each switch corresponding to each of the stop, tail, and parking indicator functions, and also adjusts the illuminance level during the lighting of the single pulp according to the detection result of the detection means. There is a version that switches the level to a lower level. Embodiments of the present invention will be described below with reference to the drawings.

[Examples]

FIG. 1 and FIG. wJ2 are a schematic configuration diagram of a single pulp control device according to an embodiment of the present invention and its υ1 road diagram. In Fig. 1, 1 is an in-vehicle battery, 2 is an ignition switch (hereinafter referred to as an IG switch) whose one end is connected to the battery 1, and a stop switch (hereinafter referred to as an IG switch) connected in series with three IG switches 2-. , ST switch), 4 is a tail switch (hereinafter referred to as TA switch), and 5 is a parking switch (hereinafter referred to as P switch).
One ends of these switches 4 and 5 are connected to the battery 1 in parallel with each other. Reference numeral 6 indicates a seating sensor consisting of a microswitch, a pressure switch, etc. installed in the driver's seat of the car.When the driver is seated, the movable contact 6a closes to the TA contact 6b, and the sensor 6 is activated when the car is stopped. The movable contact 6a closes to the PA point 6C when the person leaves the sensor. 10 is a control circuit for controlling the energization of the commonly known single pulp 12 according to the stop, tail and parking sign functions based on the on/off operation of each of the switches 3 to 5; 11 is a drive transistor thereof; A specific example of the control circuit 10 is shown in FIG.

Here, 21 is a diode whose anode is connected to the other end of the 81' switch 3, and 22 is a TA contact 6b of the seating sensor 6 to which the other end of the TA switch 4 and the movable contact 6a are connected.
23 is a diode whose anode is commonly connected to the other end of the PA switch 5 and the TA contact 6c of the seating sensor 6. The cathodes of these backflow prevention diodes 21 to 230 are commonly connected. It is connected to a power supply line 24, and a predetermined drive voltage VCe is supplied from the battery 1 to this power supply line 24 when each of the switches 3 to 5 is on (25).
is a pulse oscillator consisting of an operational amplifier 26, input resistors 27 and 28, a feedback resistor 29, and a time constant circuit 32 including a resistor 30 and a capacitor 31. This pulse oscillator 25 is used to drive the power supply line 24. The voltage obtained by dividing the voltage by the human resistors 27 and 28 is input to one input terminal (■) of the operational amplifier 26, and a pulse with a constant period determined by the time constant of the resistor 30 and the capacitor 31 of the time constant circuit 32 is oscillated. , the pulse width of which can be changed by a variable duty ratio circuit, which will be described later.

The reference numeral 35 is a comparator circuit having two input terminals, one of which is connected via a resistor 36 to a connection point C between the resistor 3o of the time constant circuit 32 and the capacitor 31. A switch circuit 39 consisting of a bias circuit 38 including a transistor 37, a diode, and a resistor is configured for the m-type capacitor 31, and this switch circuit 39 is turned on and off in response to the operation of the 8T switch 3. Works off. Further, the driving voltage of the power supply line 24 is input to the other input terminal Q by valving a switch circuit 41 consisting of a transistor 4° which is turned on and off by the output of the operational amplifier 26, and the input terminal is connected to a resistor 42. is grounded through.

A parallel circuit 46 is connected between one end of this resistor 42 and the output terminal a of the operational amplifier 26, which is a series body including a resistor 43, a resistor 44, and a switching transistor 45. A bias circuit 4 including a transistor 47, a diode, and a resistor is connected to the transistor 45.
A switch circuit 49 consisting of 8 is configured, and this switch circuit 49 is turned on and off in response to the operation of the TA switch 4.
Then, the transistor 45 is turned on and off. In addition, the output terminal e of the comparator 35 is connected to the diode 5.
0 and the resistor 3° and the capacitor 3 through the resistor 51.
1, and by rapidly charging the capacitor 31 according to its output voltage, the pulse width of the pulse oscillator 25 is changed and the duty ratio of the pulse is varied. . In addition, the duty ratio variable circuit j
! It consists of 3 parts. 1p12 In the figure, 52 is a buffer transistor.

Next, the operation of the above embodiment will be explained with reference to the time chart of FIG. Here, the driver turns on the IG switch 2 and drives the car, and the seating sensor 6 has the movable contact 6a at TA.
It is assumed that contact 6b is closed. When the fcsT switch 3 is turned on while driving, the power supply voltage changes from the battery 1 to the ST switch 3. The signal is input to the operational amplifier 26 of the pulse oscillator 25 and the switch circuit 41 via the power supply line 24, and is also input to the ridge switch circuit 39. Then, this switch circuit 41 is turned on and at the same time, the switch circuit 39 is also turned on. As a result, the potential at the connection point S determined by the input resistors 27, 28 and the feedback resistor 29 is inputted to the input terminal (2) of the operational amplifier 26, and at the same time, the switch circuit 39 is turned on, so that the input terminal θ of the operational amplifier 26 becomes 0. The potential at the point is held at zero. As a result, a potential substantially equal to the voltage Vcc of the power supply line 24 is constantly obtained at the output terminal point a of the operational amplifier 26, regardless of the operation of the switch circuit 41. As a result, the drive transistor 11 drives the single pulp 12 with direct current (DC) via the buffer transistor 52. Therefore, single bulb 12#-j: lights up with high illuminance and functions as a stop lamp. Also, this indicator function is activated when the IG switch 2 is turned on.
, it is possible to give priority to the operation regardless of the ON operation of the PA switch 5.

In addition, when the IG switch 2' (i- is turned off and the TA switch 4 is turned on, the power supply voltage from the battery 1 is applied to the TA switch 42, the movable contact 6b of the seating sensor 6, the TA contact 6b, and the power line 24. It is input to the operational amplifier 26 of the pulse oscillator 25 and the switch circuit 41 via the pulse oscillator 25, and also to the switch circuit 49. Then, at the same time as this switch circuit 41 is turned on, the switch circuit 49 is also turned on, and the parallel circuit 46 turns on the transistor 45 and decreases L2.As a result, the operational amplifier 26
As shown in FIG. 3(a), the potential Vb of the connection point S is input to the input terminal 1 of the 11. Ru. At this time, the potential Vc of the capacitor 31 is input to the input terminal (3) of the comparator 35, and the potential of the connection point d is input to the input terminal Q of the comparator 35. When the input potential Vc exceeds the potential, a high level output is generated at the output terminal e as shown in FIG. 3(c). Therefore, this output is applied to the capacitor 31 via the diode 50 and the resistor 51, and the capacitor 31 is rapidly charged according to the time constant τ2 with the resistor 51. As a result, the output potential of the operational amplifier 26 instantaneously drops from a high level to a low level as shown in FIG. 3(b), and at the same time, the capacitor 31 drops as shown in FIG. It discharges according to the time constant τl with the resistor 30, and this operation is performed at one output pulse.
This will be repeated every cycle T. At this time, the potential kVd of the connection point d input to the input terminal e of the comparator 35
, resistance value 'kRz of resistor 42, resistance 43 of parallel circuit 46
Assuming that the resistance values of and 44 are respectively Rs l R4, the potential Vd is as follows.The comparator 35 quickly charges the capacitor 31 in response to the potential Vd at the connection point d. Therefore, as shown in FIG. 3(b), the pulse oscillator 25 outputs a pulse width that transitions from a low level to a high level and then falls to a low level again, that is, an on-time ts (t+<T
OFF time t only becomes shorter. A pulse with constant ff is oscillated, and the duty ratio k of this pulse is
Let it be DI. Therefore, when the TA switch 4 is on, the single pulp 12 is activated by the pulse oscillator 2.
Duty D of the pulse oscillating from 5! It lights up at low illuminance by being energized by the PA switch 5, which functions as a tail lamp.
It can be activated with priority regardless of the 0-on operation.

On the other hand, when only the P and A switches 5 are turned on, the power supply voltage from the battery 1 is input to the operational amplifier 26 of the pulse oscillator 25 via the PA switch 5 and the power line 24, and is also input to the switch circuit 41. is input. Then, the potential Vc of the capacitor 31 similar to that described above is input to the input terminal 3 of the comparator 35, but since the transistor 45 of the parallel circuit 45 is in the off state, the potential Vc of the capacitor 31 is input to the input terminal e of the comparator 35. The voltage-divided potential at the connection point d is input. Therefore, if the potential of this connection point d is Vd, this potential Vd is as follows. Thereby, the comparator 35 charges the capacitor 31 more quickly by the potential Vd+ than when the voltage is Vd. Therefore, the on-time t2 (
tg<tl) is further shortened and the off time t. ff
When all pulses are oscillated with a constant value, and the duty ratio of this pulse is k D z, this becomes even smaller than the above-mentioned duty ratio. As a result, when the PA switch 5 is on, the single pulp 12 is energized at the FIJ ratio D2, so that the pulp 12 is lit at a lower illuminance and can function as a parking lamp.

Next, when the driver stops the car and leaves the driver's seat with the TA switch 4 turned on, the movable contact 6a of the seating sensor 6 switches from the TA contact 6b to the PA contact 6c.

Therefore, the control circuit 10 controls the energization of the single pulp 12 in the same way as when the PA switch 5 is turned on, so that the illuminance level of the tail lamp that is turned on can be switched to a lower parking level. At this time, as shown in FIG. 4, by inserting a seat sensor 7 that turns off when the driver takes a seat and turns on when the driver leaves the seat, between the base of the transistor 47 of the switch circuit 49 and the ground. Turn on TA switch 4 and fc'li
When the driver leaves the seat, the seat sensor γ turns on and turns off the transistor 47, so it can be operated in the same manner as the seat sensor 6 described above.

Thus, according to the above embodiment, the three ST switches 3. A pulse oscillator 25 is provided which oscillates a pulse of a constant period in conjunction with the operation of the TA switch 4 and the PA switch 5, and the duty ratio is adjusted by changing the width of the pulse oscillated from this pulse oscillator in accordance with the operation of each of the switches. In addition, the priority of each switch is given to ST switch 3, TA switch 4, and PA switch in this order, and by controlling the single pulp based on the output of the pulse oscillator, this single valve can be adjusted according to the purpose of use. Depending on the illuminance, it can function as a stop lamp, tail lamp, or parking lamp. Furthermore, by changing the pulse width oscillated by the pulse oscillator 25 and fully varying its duty ratio, it is possible to change the on time of the drive pulse and keep the off time constant, so the duty ratio is small (10% (below), the duty ratio can be easily varied compared to a case where the frequency is constant and only the duty ratio is small or variable.

Moreover, the frequency does not become infinitely small;
It is possible to prevent the lighting from flickering due to being turned off. Furthermore, when the driver leaves the driver's seat with the TA switch 4 turned on, the illuminance level can be switched to a parking level lower than that level, thereby reducing battery power consumption.

FIG. 5 is a circuit diagram equivalent to FIG. 2 showing another embodiment of the present invention. The difference from FIG. 2 is that the feedback system of the operational amplifier 26 is The time constant of the time constant circuit 32 inserted into the ST switch 3. The discharging time constants of the resistor 30 and the capacitor 31 and the charging time constants of the capacitor 31 are fully controlled by varying them according to the operations of the TA switch 4 and the PA switch. Then, the seating sensor 7 similar to that shown in FIG. 4 is connected to a parallel circuit 64'is
This is because the transistor 63 is inserted between the base of the transistor 63 and the ground. In this case, the resistor 30 of the time constant circuit 32
A parallel circuit 64 of a series body including a resistor 61 and a resistor 62 and a switching transistor 63 is connected in full parallel with a backflow prevention diode 65 connected in series to the parallel circuit 64. diode,
A bias circuit 66 consisting of a resistor is added so that the transistor 63 is turned off when only the TA switch 4 is turned on.

According to this embodiment, when the ST switch 3 is turned on, the switch circuit 39 is turned on, so the pulse oscillator 25
. . . generate a DC level output as in the above embodiment.

Further, when only the TA switch 4 is turned on, the transistor 63 of the parallel circuit 64 is turned off, and the time constant circuit 32 is turned off.
Since the resistor 61 is inserted in parallel with the resistor 30,
The resistance value of resistor 30 is R1s, the resistance value of resistor 61'ThR5
, the capacitance value of the capacitor 31 is C], then the above discharge time constant τ is. ff is τoff = C1(R'//Rs
) < C+ Rt (3). Therefore, the on-time TI of the pulse oscillated from the pulse oscillator 25 is controlled by controlling the charging time constant of the time constant circuit 32 to the capacitor 31.
The duty ratio can be varied by changing (TI<TON).

Further, when only the PA switch 5 is turned on, the transistor 63 of the parallel circuit 64 is turned on, and the time constant circuit 3 is turned on.
Parallel circuit 6 consisting of resistance 61.62 for resistance 30 of 2
4 is inserted, the discharge time constant τ. ff is resistance 62
When the resistance value fi=Rg, τ(, ff=C+(R
+//Rs/insect a)<C+(R+//Rs) (4). Therefore, the on time Tz of the pulse oscillated from the pulse oscillator 25 in the same manner as when the TA switch 4 is operated.
(T2<TI) The duty ratio can be varied by changing t. Therefore, even in this embodiment, the same effects as in the above-mentioned embodiment can be achieved.

FIG. 6 is a circuit diagram of the main part corresponding to FIG. 2 showing another embodiment of the present invention. The difference from Fig. 2 is that the detection sensor 8f is turned on and off in conjunction with the handbrake as a means of detecting the stoppage of the vehicle.
A resistor 71 is inserted between the base of the transistor TO and ground, and the base of the transistor TO is connected to a resistor 72. It is connected to the IC switch 2 in FIG. 2 via a diode 13. The collector of the transistor 70 is connected to the midpoint between the resistors 74 and 75 connected between the base of the transistor 45 and the collector of the transistor 47. In this embodiment, when only the TA switch 4 is on, the handbrake is pulled to stop the car, and the IC switch 2 is on to turn off the engine, the detection sensor 8 is turned on (closed) and the vehicle is stopped. The transistor 70 is turned on.Therefore, the transistor 45 is turned on, and the illuminance level of the lit tail lamp can be switched to the parking level in the same way as described above.

FIG. 7 is a circuit diagram of the main part corresponding to FIG. 5 showing still another embodiment of the present invention, and shows a detection sensor 8 similar to that shown in FIG. 6.
Transistor 10. Diode 73 and resistor 71.7
The circuit consisting of 2,74.75 is the transistor 6 in Figure 5.
3 and the bias 1 path 66, the same effect as the embodiment shown in FIG. 6 described above can be obtained.

FIG. 8 is a circuit diagram of the main part corresponding to FIG. 2 showing still another embodiment of the present invention. The difference from FIG. 6 is that the means for detecting the stoppage of the vehicle is composed of a speed sensor 80, a sensor circuit 81, and an IJ gala pull one-shot multi-circuit 82 that is triggered by an output pulse from the sensor circuit. , the output of this circuit 82 is connected to the transistor 7
I entered it as 0. In addition, in FIG. 8, 83 is a speed meter control section. According to this example, ′v
When only one A switch is on and the car is stopped and the engine is off, the retrigger pull one-shot multi-circuit 82 inputs a low level output corresponding to the traveling speed OKm/Hr to the transistor 70 and outputs it. Since the tail lamp is turned on, the illuminance level of the lit tail lamp can be switched to the parking level after a certain period of time determined by the retriggerable one-shot multi-circuit 82. Note that a tachometer or the like that detects the number of revolutions of the engine may be used as a means for detecting whether the engine is turned off.

FIG. 9 is a circuit diagram of the main parts corresponding to FIG. 5 showing still another embodiment of the present invention, and includes a speed sensor 80 and a sensor circuit 81 (not shown) and a retrig puller similar to those shown in FIG. 8. The above-mentioned eighth
The same effect as the embodiment shown in the figure can be obtained.

FIG. 1θ is a schematic configuration diagram showing still another embodiment of the present invention, and shows the functions of the embodiment of FIG. A case is shown in which a microprocessor (hereinafter referred to as CPU) 90 performs a function of switching the illuminance level of the stop lamp to the tail level after a certain period of time when is held. Here, the CPU 90 is a CPU capable of displaying various information such as a speedometer, trip meter, and odometer on a meter display section 92, and this CPU 90 includes an IC switch 2. ST switch 3, TA switch 4 and PA
Input signals associated with turning on and off the switch 5 are input through an interface 91, and a distance pulse from a distance sensor 89 that detects the distance traveled by the car is directly input. In normal times, each of the switches 2 to 5
, and follow the priority order of ST switch 3, TA switch 4, and PA switch 5? Single valve 12 (
(also called a lamp). At this time, among the sign functions of the single bulb 12, the stop lamp is on duty at 100% (1”) and the tail run is on.

The on-duty of parking lamps and parking lamps is A% (Drop A') and B% ('B'), respectively, and these are 1
It is assumed that the relationship is ＞A＞B.

When the distance pulse and the ON signal of the ST switch 3 are input to the CPU 90 from the distance sensor 89 while the IG switch 2 is on, the CF2O0 performs a step as shown in the 70-chart of FIG. 110~
Proceed to 112. At this time, if there is a distance pulse from the distance sensor 89 in step 112, step 113
Go to step 1 and set the timer setting time Ts'e'). Then, in step 114, the drive output of each duplex 1 is sent to the single bulb 12, and the duty 1 lights up all the distop lamps. In addition, the above step 112
If it is determined that there is no distance pulse in step 115
Proceed to. Here, if the ST switch 30 remains on for a certain period of time and the time T8 exceeds the timer set time Tsk, the process proceeds to step 116, and the step 114 described above
This operation is continued while the vehicle is stopped and the ST switch 3 remains on. Then, when the ST switch 3 is turned off, the CPUjO proceeds to steps 118 and 116 and steps 119 and 120, performs an operation that depends only on whether the TA switch 40 or the PA switch 50 is turned on, and returns to normal operation.

On the other hand, if the IG switch 2 is turned off in step 110 and the TA switch 4 is turned on in step 121, the process proceeds to step 122. Konoto@, TA switch 4
is turned on (Tt) for - time, followed by timer setting time TT.
When the level exceeds k, the duplex 4A (D tail level (Stella 7126) f) is switched to the parking level of the tuner 1B (step 125), and this operation is continued. Note that the CPU 90 outputs 1 when the IG switch 1 and 2 are turned on.
It operates and controls the meter display and lamp. Also, when IQ switch 2 is off and TAX/1tsuchi4 is on, KUC
The PU901d operates to control all lamps, but the meter display operates to turn off all lights.

〔Effect of the invention〕

As explained above, according to the single valve control device of the present invention, a Norms oscillator is provided which oscillates a one-leg cycle pulse in conjunction with the three switches, the ST switch, the TA switch, and the PA switch. The duty ratio is varied by changing the pulse width oscillated by the pulse oscillator according to the operation of each of the switches, and the single valve is controlled based on the duty ratio.
This single bulb can function as a stop lamp, tail lamp, or parking lamp with illuminance depending on the purpose of use. In addition, by changing the pulse width of the pulse oscillator, the on time can be varied and the off time can be made constant, making it possible to easily change the duty ratio and prevent flickering during lighting. . In addition, when the car is stopped, the illuminance level that occurs while the single bulb is lit can be switched to a lower level, so battery consumption can be completely reduced, providing excellent effects as an automotive lamp.

[Brief explanation of the drawing]

1 and 2 are a schematic configuration diagram and a circuit diagram of a single valve control device according to an embodiment of the present invention, FIG. 3 is a waveform diagram of the main parts used for the operation of the above embodiment, and FIG. 4 is the same as above. FIG. 5 is a circuit diagram showing a modification of the embodiment; FIG. 5 is a circuit diagram showing another embodiment of the invention; FIGS. 6 to 9 are circuit diagrams of main parts showing another embodiment of the invention; FIG. The figure is a schematic configuration diagram showing yet another embodiment of the present invention, and FIG. 11 is a flowchart for the operation of the embodiment of FIG. 10. 1# fist - battery, 2eΦ... ignition switch (IG switch), 3... and middle strap switch (S
T switch), 4φ... tail switch (TA switch), 5... parking switch (PA switch), 6.7φos-seating sensor, 8 @... detection sensor, 10 parables, tension, control circuit, 11...drive transistor, 12---single valve, 21 to 23
11@1111 diode, 2511 II-11 pulse oscillator, z6... operational amplifier, 2T, 2B...
...Resistance, 29...Feedback resistance, 32...Time constant circuit, 3511・Q・Comparator, 39,41゜49
・---・Switch circuit, 42-44.61-62...-
・Resistance, 45.83-... Switching transistor, 46.64... Parallel circuit, 65 Medium Φ diode, 80... Speed sensor, 8911...
・Distance sensor. Patent Applicant Koito Manufacturing Co., Ltd. Agent Masaki Yamakawa (TLA-2) Figure 1 Figure 2 Figure 3 Figure 4 Figure 7 Figure 5 Figure 6 Figure 3 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] Stop using reflected light from one filament,
The vehicle is equipped with a single bulb having light distribution characteristics corresponding to the three sign functions of tail and parking, a control circuit for controlling the illuminance of the single bulb, and a detection means for detecting the complete stoppage of the vehicle, the control circuit comprising: A pulse oscillator that oscillates a pulse with a one-leg period based on the operation of the three switches that activate the stop, tail, and parking sign functions, respectively, and a pulse oscillator that controls the width of the pulse oscillated by the pulse oscillator for each of the stop, tail, and parking signs. A duty ratio variable means is configured to vary the duty ratio by changing the duty ratio in response to the operation of each switch for fully activating the indicator function, and by controlling the energization of the single valve based on the output of the pulse oscillator, each of the above-mentioned The illuminance level is varied in conjunction with each switch corresponding to the stop, tail, and parking sign functions, and the illuminance level that is present when the single pulp is lit is reduced to a lower level based on the detection result of the detection means. A single valve control device characterized by switching.