JPH0230897B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a control device for a single bulb (also referred to as a single filament valve) used as an automotive lamp, and particularly to a control device for a single filament (hereinafter referred to as a single filament). The present invention relates to a single valve control device that variably controls the illuminance level of each marker function in a single bulb having a plurality of marker functions.

[Prior art] Conventionally used as an automobile lamp2
For valves with two filaments,
Because the two filaments installed in one bulb chamber are in different positions, the relative positions of each filament and the reflector and front lens tend to shift.
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, single filament has been developed for stop, tail and parking.
A single valve with two marking functions has been proposed. This single bulb has a single filament placed at the focal point of a parabolic reflector, and the reflected light from this filament is emitted through a predetermined lens system, thereby supporting each stop, tail, and parking sign function. It is configured to have light distribution characteristics. A single bulb with such a structure has the advantage that the relative positions of the single filament, the reflective surface, and the lens system can be made accurate, the decrease in luminous intensity is small, and the bulb 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 purpose is to control the illumination intensity of each sign function of a single bulb with a simple configuration, and to control the illuminance level while the single bulb is lit when the vehicle is stopped. The object of the present invention is to provide a single-valve control device that can reduce battery consumption by switching to a lower level.

In order to achieve such an objective, the present invention
A single bulb having a plurality of indicator functions with one filament, and a control circuit that controls energization of the single bulb in conjunction with switches that operate each indicator function of the single bulb so as to obtain illuminance corresponding to each of the switches. and a detection means for detecting a stopped state of the vehicle when the ignition switch is turned on, and by controlling the control circuit based on the detection result of the detection means, the single bulb is turned on. A certain illumination level is switched to a lower level after a certain period of time. Embodiments of the present invention will be described below with reference to the drawings.

〔Example〕

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. 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,
3 is a stop switch (hereinafter referred to as ST switch) connected in series with this IG switch 2;
5 is a tail switch (hereinafter referred to as a TA switch), and 5 is a parking switch (hereinafter referred to as a PA switch), and one ends of these switches 4 and 5 are connected to the battery 1 in parallel. 6 is a speedometer that detects the speed of the car and outputs an output corresponding to the speed; 7 is a detection circuit that detects the stopped state of the car based on the output of the speedometer 6 and the ON/OFF operation of the ST switch 3. . Reference numeral 10 controls the energization of a commonly known single valve 12 according to the stop, tail, and parking sign functions based on the on/off operations of the switches 3 to 5, and lights up according to the detection output of the detection circuit 7. 11 is a drive transistor for switching the illuminance level of the stop indicator function to a lower level of the tail indicator function;
A specific example of the control circuit 10 is shown in FIG.

Here, 21, 22 and 23 are anodes
These are reverse current blocking diodes connected in series with the other ends of ST, TA, and PA switches 3 to 5, respectively, and the cathodes of these diodes 21 to 23 are commonly connected to a power supply line 24, and this power supply line 24 is supplied with a predetermined drive voltage Vcc from the battery 1 when each of the switches 3 to 5 is turned on. 25 is an operational amplifier 26
, input resistors 27 and 28, and feedback resistor 29
The pulse oscillator 25 is composed of a time constant circuit 32 including a resistor 30 and a capacitor 31. , which oscillates a pulse with a constant period determined by the time constant of the resistor 30 and capacitor 31 of the time constant circuit 32, and whose pulse width is changed by a variable duty ratio circuit described later. It is becoming.

Further, 35 is a comparator having two input terminals, one of which is connected to a connection point C between the resistor 30 and the capacitor 31 of the time constant circuit 32 via a resistor 36. and,
A switch circuit 39 consisting of a bias circuit 38 including a transistor 37, a diode, and a resistor is configured for the capacitor 31, and this switch circuit 39 is turned on and off in response to the operation of the ST switch 3. The other input terminal is connected to the collector of a transistor 40 constituting a switch circuit 41 that is turned on and off by the output of the operational amplifier 26, and is also grounded through a resistor 42. A resistor 4 is connected between one end of this resistor 42 and the output terminal a of the operational amplifier 26.
3, resistor 44, and switching transistor 45
A parallel circuit 46 is connected to a series body including the following. 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,
This switch circuit 49 turns on and off in response to the operation of the TA switch 4, thereby turning on and off the transistor 45. Further, the output terminal e of the comparator 35 is connected to the connection point between the resistor 30 and the capacitor 31 via a diode 50 and a resistor 51, and the capacitor 31 is rapidly charged in accordance with the output voltage. , the duty ratio of the pulse is varied by changing the pulse width of the pulse oscillator 25. Also, 54
is a bias circuit 5 including a transistor 52 and a resistor.
The collector of this transistor 52 is connected to the base side of the transistor 37 of the switch circuit 39 through a diode 55, and the collector of the transistor 52 is connected to the base side of the transistor 37 of the switch circuit 39 through a diode 56.
9 is connected to the collector side of the transistor 47. Therefore, when the output detected by the detection circuit 7, which will be described later, is input to the switch circuit 54 when the vehicle is stopped, the switch circuit 54 is turned on, turning on the transistor 45 of the parallel circuit 46, and also turning on the switch circuit 54. 39 transistors 37 are turned off. Note that each of the comparators 35, the switch circuits 39, 41, and 49, the resistor 42, and the parallel circuit 46 constitute a variable duty ratio circuit. In Figure 2,
57 is a buffer transistor.

FIG. 3 is a block diagram showing a specific example of the detection circuit 7. As shown in FIG. In the figure, 60 is a transistor 6 that is turned on and off as the ST switch 3 is operated.
1 is an inverter, 62 is a speedometer 6
The speedometer 6 is a NOR circuit which receives the output of Other than (v≠0Km/Hr)
Assuming that an output of "H" (high level) is generated when
When the IG switch 2 is on and the ST switch 3 is off and the output of the inverter 60 is at "H", the output is "L". Then, when the output of the speedometer 6 is "L" and the ST switch 3 is turned on, and the output of the inverter 60 becomes "L", the output becomes "H". 63 is a timer that is reset when the output of the NOR circuit 62 is "L" and starts timing operation when it is "H"; 64 is a timer that compares the measured value of the timer 63 with a reference value set in the reference setting device 65; This is a comparator that generates an "H" output when the measured value exceeds a reference value, and the output of this comparator 64 is used as a control output of the transistor 53 constituting the switch circuit 53 shown in FIG. entered in the base. Therefore, the detection circuit 7 having such a configuration performs the standard setting when the output of the speedometer 6 is "L" with the IG switch 2 on, that is, when the vehicle is stopped and the ST switch 3 is held on. The comparator 64 generates an "H" output after a certain period of time corresponding to the reference value set in the comparator 65, and otherwise generates an "L" output.

Next, the operation of the above embodiment will be explained with reference to the time chart of FIG. First, when the IG switch 2 is turned on and the car is running, when the car is stopped, the ON time of the ST switch 3 is shorter than the preset reference value, and the detection circuit 7 outputs "L". The case where the switch circuit 53 is turned off due to the occurrence of the switch circuit 53 will be explained. However, when only ST switch 3 is turned on, the power supply voltage is changed from battery 1 to ST.
The switch 3 is connected to the operational amplifier 26 of the pulse oscillator 25 and the switch circuit 41 via the power line 24.
The signal is input to the switch circuit 39 as well as to the switch circuit 39. Then, the switch circuit 41 is turned on and at the same time the switch circuit 39 is also turned on, and the capacitor 31 of the time constant circuit 32 is instantaneously discharged through the transistor 37 of the switch circuit 39. As a result, the potential at the connection point b determined by the input resistors 27 and 28 and the feedback resistor 29 is inputted to the input terminal of the operational amplifier 26, and at the same time, the switch circuit 39 is turned on to input the potential at the connection point c to the input terminal of the operational amplifier 26. The potential at the point is held at zero. As a result, regardless of the operation of the switch circuit 41, the output terminal point a of the operational amplifier 26 is at the voltage Vcc of the power supply line 24.
A potential approximately equal to that can be obtained steadily. As a result, the drive transistor 11 drives the single valve 12 with direct current (DC) via the buffer transistor 57. Therefore, the single bulb 12 lights up with high illuminance and functions as a stop lamp. Further, this indicator function can be preferentially activated when the IG switch 2 is turned on, regardless of whether the TA switch 4 or the PA switch 5 is turned on.

Next, when only the TA switch 4 is turned on, the power supply voltage from the battery 1 is input to the operational amplifier 26 of the pulse oscillator 25 and the switch circuit 41 via the TA switch 4 and the power line 24, and the switch circuit 49 is input.
Then, this switch circuit 41 is turned on, and at the same time, the switch circuit 49 is also turned on, and the parallel circuit 4 is turned on.
6 transistor 45 is turned on. As a result, as shown in FIG. 4a, the potential Vb of the connection point b is input to the input terminal of the operational amplifier 26, and the potential Vc of the capacitor 31, which increases exponentially, is input to the input terminal of the operational amplifier 26. At this time, the input terminal of the comparator 35 is connected to the capacitor 31.
Since the potential Vc at the connection point d is input to the input terminal, the comparator 35 outputs the voltage at the output terminal e when the input potential Vc exceeds the potential at the connection point d. A high level output is generated as shown in Figure 4c. Therefore,
This output is sent to the capacitor 31 via a diode 50 and a resistor 51.
charges rapidly according to the time constant τ ₂ with its resistor 51. As a result, the output potential of the operational amplifier 26 instantaneously falls from a high level to a low level, as shown in FIG.
1 is the time constant τ ₁ with the resistor 30, as shown in Figure 4a.
This operation is repeated every cycle T of the output pulse. At this time, the potential of the connection point d input to the input terminal of the comparator 35 is Vd, the resistance value of the resistor 42 is R ₂ , and the parallel circuit 4
The resistance values of resistors 43 and 44 of 6 are R ₃ and
Assuming R ₄ , this potential Vd is Vd=VccR ₂ /R ₂ +(R ₃ R ₄ )...(1), and the comparator 35 is connected to the potential at the connection point d.
The capacitor 31 is rapidly charged in response to Vd. Therefore, as shown in FIG. 4b, from the pulse oscillator 25, the pulse width that transitions from a low level to a high level and falls to a low level again, that is, the on-time t ₁ (t ₁ <T _ON ), is only shortened. A pulse with a constant off time t _pff is oscillated at , and the duty ratio of this pulse is set to D ₁ . Therefore, the above
When the TA switch 4 is on, the single bulb 12 is energized by the duty D ₁ of the pulse oscillated by the pulse oscillator 25, so it lights up at low illuminance and functions as a tail lamp. It can be activated with priority regardless of the ON operation of the switch 5.

When only the PA switch 5 is 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. Ru. Then, comparator 3
The same capacitor 31 as described above is connected to the input terminal of 5.
The potential Vc is input to the input terminal, but
Since the transistor 45 of the parallel circuit 46 is in an off state, the potential at the connection point d divided by the resistors 42 and 43 is input. Therefore, if the potential of this connection point d is Vd ₁ , this potential Vd ₁ becomes Vd ₁ = VccR ₂ /R ₂ +R ₃ <VccR ₂ /R ₂ + (R ₃ R ₄ )...(2) . As a result, the comparator 35 quickly charges the capacitor 31 using the potential Vd ₁ more quickly than when the voltage is Vd. Therefore, the pulse oscillator 25 oscillates a pulse whose on time t ₂ (t ₂ <t ₁ ) is even shorter and whose off time t _pff is constant,
Assuming that the duty ratio of this pulse is _D2 , this becomes even smaller than the above-mentioned duty ratio _D1 .
As a result, when the PA switch 5 is on, the single valve 12 has the duty ratio D ₂
By controlling the energization, the bulb 12 lights up at even lower illuminance and can function as a parking lamp.

On the other hand, if the ON operation of the ST switch 3 is maintained at a preset reference value or higher when stopping the car, the control circuit 10 operates in the same manner as described above at the same time as the ST switch 3 is turned on, and the single valve 1
2 to function as a stop lamp. At this time, the speedometer 6 detects that the car has stopped and its output changes from "H" to "L", so the NOR circuit 62 shown in FIG. 3 has the "L" output of the speedometer 6 and the ST switch. The "L" output of the inverter 60 accompanying the turning on of the inverter 3 is input, and the output changes from "L" to "H". Therefore, timer 63
The reset is canceled by the "H" output of the NOR circuit 62, and time measurement is started. As a result, comparator 6
4 generates an "H" output when the measured value of the timer 23 exceeds the reference value, and this "H" output is the second
The signal is input to a switch circuit 54 shown in the figure. Then, the transistor 52 of the switch circuit 54 is turned on by the "H" output of the comparator 64, and at the same time,
In order to turn on the transistor 45 of the parallel circuit 46 and turn off the transistor 37 of the switch circuit 39, the control circuit 10 controls the energization of the single bulb 12 in the same way as when turning on the TA switch 4 described above. The illuminance level of the stop lamp can be switched to a lower tail level. Therefore, if the ST switch 3 is kept on when the IG switch 2 is turned on and the car is stopped, the single valve 12 is turned on after a certain period of time preset in the reference setting device 65.
The tail lamp can be dimmed from the stop lamp while it is lit. In this case, in the detection circuit 7, the timer 63 detects the "H" output of either the speedometer 6 or the inverter 60, that is, the vehicle is in a running state or the ST switch 3 is turned on, before the measured value reaches the reference value. When turned off,
It is reset again by the "L" output of the NOR circuit 62. Also, once the comparator 64 has reached the reference value,
When the comparator 64 generates an output of "H" and then resets again, the output of the comparator 64 becomes "L".

As described above, according to the above embodiment, the pulse oscillator 25 is provided which oscillates pulses with a constant period in conjunction with the operations of the ST switch 3, TA switch 4 and PA switch 5, and the pulse width oscillated from this pulse oscillator is set as described above. In addition to changing the duty ratio according to the operation of each switch, the priority of each switch is set to ST switch 3, ST switch 3,
By applying the TA switch 4 and the PA switch in that order and controlling the single bulb based on the output of the pulse oscillator, this single bulb can function as a stop lamp, a tail lamp, and a parking lamp with an illuminance depending on the purpose of use. . Furthermore, by changing the pulse width oscillated by the pulse oscillator 25 and varying its duty ratio, it is possible to change the on time of the drive pulse and keep the off time constant.
When the duty ratio is small (10% or less), the duty ratio can be changed more easily than when the frequency is constant and only the duty ratio is changed.Moreover, the frequency does not become infinitely small, and the on/off It is possible to prevent the lighting from flickering due to Furthermore, when IG switch 2 is turned on to stop the car, if ST switch 3 is kept on, the illumination level of the stop lamp can be switched to a lower tail level after a certain period of time, which reduces battery life. Power consumption can be reduced.

FIG. 5 is a circuit diagram corresponding to FIG. 2 showing another embodiment of the present invention. The difference from FIG. 2 is that in order to change the pulse width of the pulse oscillator 25, the time constant of the time constant circuit 32 inserted into the feedback system of the operational amplifier 26 is changed by operating the ST switch 3, TA switch 4, and PA switch 5. By changing the discharge time constant of the resistor 30 and the capacitor 31, the charging time constant of the capacitor 31 is controlled. When the ST switch 3 is kept in the on state when stopping the car, the control output obtained from the detection circuit 7 is used to switch the illuminance level of the stop lamp while the single bulb 12 is lit to a lower tail level. This is because the control circuit 10 was controlled in the following manner. In this case, between both ends of the resistor 30 of the time constant circuit 32 is a parallel circuit 74 with a series body including a resistor 71, a resistor 72, and a switching transistor 73.
and a backflow prevention diode 75 connected in series to the parallel circuit 74 are connected in parallel, and a diode 76a and a resistor 76b are connected to the base of the transistor 73.
By adding a bias circuit 76 consisting of ~76d,
When the TA switch 4 is turned on, the transistor 73 is turned off. Further, a switch circuit 82 is provided which includes a transistor 81 that is turned on and off by the control output of the detection circuit 7 shown in FIG. switch circuit 84
will be established. Then, the collector of the transistor 81 is connected to the switch circuit 3 via a diode 85.
The detection circuit 7 The transistor 73 is configured to be turned off when the control output from the transistor 73 is "H".

According to this embodiment, when the ST switch 3 is turned on, the switch circuit 39 is turned on, so that from the pulse oscillator 25, as in the above-mentioned embodiment,
It will generate a DC level output. Also,
When only the TA switch 4 is turned on, the transistor 73 of the parallel circuit 74 is turned off, and the resistor 71 is inserted in parallel with the resistor 30 of the time constant circuit 32, so the resistance value of these resistors 30 is R ₁ , the resistance value of resistor 71 is R ₅ , and the capacitance value of capacitor 31 is
When C ₁ is assumed, the discharge time constant τ _pff becomes τ _pff = C ₁ (R ₁ R ₅ )<C ₁ R ₁ (3). Therefore, by controlling the charging time constant of the time constant circuit 32 to the capacitor 31, the pulse oscillator 25
On-time T _{1 of the pulse oscillated from T 1} (T ₁ < T _ON )
The duty ratio can be varied by changing .
Also, if only PA switch 5 is turned on,
Since the transistor 73 of the parallel circuit 74 is turned on and the parallel circuit 74 consisting of the resistors 71 and 72 is inserted to the resistor 30 of the time constant circuit 32, the discharge time constant τ _pff is set to the resistance value of the resistor 72 by R ₆ Then, τ _pff = C ₁ (R ₁ R ₅ R ₆ ) < C ₁ (R ₁ R ₅ )...(4). Therefore, the duty ratio can be varied by changing the on time T ₂ (T ₂ <T ₁ ) of the pulse oscillated from the pulse oscillator 25 in the same manner as when the TA switch 4 is operated. On the other hand, if you keep ST switch 3 on when stopping the car,
The control circuit 10 includes a single valve 1 as described above.
The transistor 81 of the switch circuit 82 is turned on by the "H" control output obtained from the detection circuit 7 after a certain period of time, and the transistor 8 of the switch circuit 84 is turned on.
3 is also turned on, and the transistor 73 of the parallel circuit 74 is turned off, so that it operates in the same way as when the TA switch 4 is turned on, and the illuminance level of the stop lamp can be switched to the tail level. Therefore, the embodiment with such a configuration can also achieve the same effect as the embodiment described above.

FIG. 6 shows a modification of the detection circuit shown in FIG. turning on the rotation sensor 91;
This shows a case in which the stopping of the vehicle is reliably determined using the pulse signal associated with the off-state. Here, a retriggerable one-shot multi-circuit 93 that is triggered by a pulse signal detected from the rotation sensor 91 is provided, and a set time determined by the time constant when this multi-circuit 93 is no longer triggered by the pulse signal is provided. Afterwards, an "H" output is generated as a control output, and by inputting the control output to the switch circuit 54 (see FIG. 2) or the switch circuit 82 (see FIG. 5) of the above embodiment, ,Similarly to the above, when the car is stopped, ST switch 3
It is also possible to switch the illuminance level of the stop lamp to the tail level after a certain period of time when the on operation is held. In addition, in FIG. 6, 92 is a waveform shaping circuit that shapes the pulse signal of the rotation sensor 91;
Reference numeral 95 denotes a speedometer control section that forms the main part of the speedometer 6.

FIG. 7 is an operation flow showing a modification of FIG. 6, in which the microprocessor configuring the speedometer control section 95 shown in FIG. 6 is used to perform processing for determining whether the vehicle is stopped. . here,
It is assumed that, in addition to the pulse signal from the rotation sensor 91, the microprocessor is input with operation signals associated with turning on and off the IG switch 2 and the ST switch 3. Therefore, if the IG switch 2 is on, the microprocessor determines whether or not the ST switch 3 is operated in step 110, and if the ST switch 3 is off, the microprocessor proceeds to step 111 to reset the timer, and in step 112, the microprocessor proceeds to step 111 to reset the timer. The output circuit generates an "L" output. If the ST switch 3 is on, the process advances to step 113, and the rotation sensor 9
The speed of the car is determined by the pulse signal input from 1. At this time, when the pulse signal is no longer input, the microprocessor determines that the speed of the vehicle is zero, that is, the vehicle is stopped, and starts a timer in step 114. As a result, when the timer value T exceeds the reference value _T0 in step 115, (T
T ₀ ), proceed to step 116 and output “H” from the output circuit.
will generate the output. Therefore, by using this "H" output as a control output, the same effect as the embodiment shown in FIG. 6 described above can be obtained.

In addition, although the case where a single bulb is used as an automobile lamp to function at the illuminance level of a stop lamp, a tail lamp, and a parking lamp is described above, the present invention is not limited to this, and the single bulb can be used as a headlamp. The same can be applied to the case where the illuminance level is switched from high to low.

〔Effect of the invention〕

As explained above, according to the single valve control device of the present invention, it is possible to easily switch the illuminance of each indicator function of the single valve, and
When the car is stopped, it detects the stoppage and after a certain period of time switches the illuminance level while the single bulb is on to a lower level, which has excellent effects as an automotive light, such as reducing battery consumption. There is.

[Brief explanation of drawings]

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 block diagram of the detection circuit shown in FIG. 1, and FIG. 4 is a diagram of the above embodiment. FIG. 5 is a waveform diagram of the main parts used in the operation of the second embodiment of the present invention.
FIG. 6 is a configuration diagram showing a modification of the detection circuit shown in FIG. 3, and FIG. 7 is a flowchart showing a modification of FIG. 6. 1... Battery, 2... Ignition switch (IG switch), 3... Stop switch (ST switch), 4... Tail switch (TA switch), 5... Parking switch (PA switch), 6... Speed Meter, 7...detection circuit,
10...Control circuit, 11...Drive transistor, 12...Single valve, 21-23...
Diode, 25... Pulse oscillator, 26... Operational amplifier, 27, 28... Resistor, 29... Feedback resistor, 32... Time constant circuit, 35... Comparator, 39, 41, 49, 53... Switch circuit ,
42-44, 71-72...Resistance, 45,73...
...Transistor, 46,74...Parallel circuit, 60
... Inverter, 62 ... NOR circuit, 63 ... Timer, 64 ... Comparator, 65 ... Standard setter, 8
2, 84... Switch circuit, 91... Rotation sensor, 92... Waveform shaping circuit, 93... Retriggerable one shot multi circuit.

Claims (1)

[Claims] 1. A single bulb with a single filament having a plurality of indicator functions, and a control that controls energization of the single bulb in conjunction with switches that activate each indicator function of this single bulb so as to obtain illuminance corresponding to each of the switches. and a detection means for detecting a stopped state of the vehicle when the ignition switch is turned on, and by controlling the control circuit based on the detection result of the detection means, the single bulb is turned on. A single-valve control device characterized in that a certain illumination level is switched to a lower level after a certain period of time.