JPS585633Y2 - Vehicle light control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle light control device, and more particularly to a device that changes the brightness of one lamp to make it a multi-purpose lamp.

For example, if you look at the lamps installed at the rear of a car, there are parking lamps, tail lamps, and stop lamps.

Although these are all lamps of the same color, red, they are functionally differentiated by differences in brightness, such as 5W, 10W, and 25W.

For this reason, lamps with different brightness are prepared for each, which is a factor in the complexity of the same color lamp section.

Even if double-filament type lamps with different brightnesses are used, the number of lamps will be reduced, but the number of power supply lines to each filament, that is, the number of harnesses, will remain the same, so the wiring complexity will remain the same.

This invention is a combination of single-centered lamps of the same color system that are placed adjacent to each other among various types of vehicle lamps and each has an independent function due to the difference in brightness. The object of the present invention is to provide a vehicle light control device that controls the lamps to have different functions by changing the brightness of the lamps.

Conventionally, methods for changing the brightness of a lamp include changing the voltage applied to the lamp, or changing the current supplied to the lamp at a cycle of 0N- to the extent that the brightness of the lamp does not flicker.
There is a method in which the average value of the current is changed by turning it OFF and changing the time width of the ON current.

The present invention uses the latter control method, and if the ratio of ON current to OFF current, that is, the unity ratio, is 50%, the average value of the current will also be 50%, and the brightness will be lower than the rated value of the lamp used. It takes advantage of becoming.

Hereinafter, preferred embodiments of the present invention will be described in detail as illustrated in the accompanying drawings.

FIG. 1 shows an example in which the control device according to the present invention is used, and the control device 4 has one lamp load (one pair on the left and right).

The on-vehicle battery 2 is connected to the input side of the control device 4, and the switch input side is connected to, for example, a stop (brake) lamp switch S1, a tail lamp switch S2, and a parking lamp switch S3.

The lamp 6 that performs three functions is a 25W lamp that corresponds to the brightest lamp in the above example.

FIG. 2 shows an example of the internal configuration of the control device 4 according to the present invention, in which 8 is a switching element such as a power transistor, the input side of which is directly connected to the battery 2, and the output side of which is directly connected to the lamp 6.

A NAND circuit 10 is connected to a control terminal of the switching element 8 .

A stop lamp switch S1 is connected to a first input of the NAND circuit 10.

The second and third inputs of the NAND circuit 10 are connected via inverters to oscillators 14 and 16 that generate signals with different duty ratios, respectively, and switches S2 and S3 are connected to their excitation inputs, respectively. .

The operation will be explained with reference to FIG. 3. When the switch S3 closes at time t1, the oscillator 16 generates a signal d with a duty ratio of 40%, and its inverted signal e.
is supplied to the switching element 8 via the NAND circuit 10.

At this time, the NAND circuit 10 requires 40% of its human power.
Since the output signal is low level for a period of 40%, a signal that is high level for 40% of the period is output.
40% of current flows through lamp 6, and lamp 6
Functions as a lamp equivalent to W.

When switch S2 closes at time t2, oscillator 14 generates a signal with a duty ratio of 70%, for example, and the inverted signal C is supplied to switching element 8 via NAND circuit 10.

At this time, the NAND circuit 10 has one of its inputs at 70%.
Since it is at a low level for a period of , a signal that is at a high level for a 70% period is output, and 70% of the current flows through the lamp 6, so that the lamp 6 functions as a lamp equivalent to 10W.

Furthermore, when the switch S1 closes at time t3, a constant continuous signal, in other words, a signal a with a tenacity ratio of 100% is supplied to the switching element 8 via the NAND circuit 10.

At this time, the NAND circuit 10 has one of its inputs as 100
%, a 100% high level signal is output, and 100% current flows through the lamp 6, so that the lamp 6 functions as a rated 25W lamp.

Next, three switches S1. S2. Any 2 of S3
The following describes the case where one or all of the files are closed in duplicate.

It is now assumed that the switch S2 is closed, the signal e is input to the NAND circuit 10, and the lamp 6 is functioning as a 5W lamp.

At this time, it is assumed that the switch S2 is closed and the signal C is input to the NAND circuit 10.

The NAND circuit 10 is a logic element that gives a high level signal to its output when at least one of its three inputs is low level, so if two or more signals are input to the NAND circuit 10, the output signal will be Among the input signals, the signal with the longest period of low level is followed.

Therefore, if the signals e and C are simultaneously input to the NAND circuit 10, the output signal f will naturally follow the signal C.

Similarly, if switch S1 is closed while switch S2 and/or switch S3 are closed, the output signal f of the NAND circuit 10 will follow the signal a.

That is, switch S1. S2. When S3 is closed for two or more times, the switches S,, S2. It becomes effective preferentially in the order of S3.

Note that the oscillators 14 and 16 in this case must synchronize their output signals at the leading edge of the rising edge (leading edge of the falling edge of the input signal to the NAND circuit 10).

For this purpose, for example, the oscillators 14, 16 can be made of monostable elements, which can be triggered by the leading edge of the signal from another oscillator.

Otherwise, instead of synchronizing the oscillators, the same effect can be achieved by disabling the function of switch S3 by closing switch S2.

The switching element 8 and the signal generating circuit for controlling it shown in FIG. 2 are merely examples, and it goes without saying that other equivalent circuits may be used as long as they achieve the purpose of the device of the present invention. There is.

According to the device of the present invention, multiple lamp functions can be performed by one lamp, so that the number of lamp loads can be reduced.

Actuators such as relays that remotely control loads are reduced.

Furthermore, the number of harnesses used for wiring can be significantly reduced.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of the use of the control device according to the present invention;
The figure is a block diagram showing an example of the internal configuration of the control device according to the present invention, and FIG. 3 is a waveform diagram of the main part in the block diagram of FIG. 2. 2...Battery, 4...Control device, 6
... Lamp, 8 ... Switching element, 10 ... NAND circuit, 14.16 ...
...Oscillator.

Claims (1)

[Scope of utility model registration request] a switching element connected between a lamp load and a power source; a device for separately or simultaneously generating a plurality of signals having different tenacity ratios to be applied to a control input of the switching element; a gate device that prioritizes signals to be applied to the switching element according to the order of the duty ratio when the signals of 1 and 2 are generated simultaneously.