KR100349498B1 - Automotive light control device - Google Patents

Abstract

The present invention can easily prevent temporary lighting of a small lamp at low cost and with a simple configuration by using the light once signal from the small light when the light switch is ON.

With the configuration, the small ramp point to the microcomputer 5 when the output of the haute light switch 10 and the light end signal obtained from the small lamp 6 are each input and the auto light switch 70 is OFF. The gate circuit which turns off the control output for a light is provided.

Description

Automotive Auto Light Control

(Industrial use)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle auto light control device that controls the lighting and turning off of head height and small lamps in accordance with illuminance obtained from an auto light sensor.

(Prior art and its problems)

6 is a circuit diagram showing a conventional vehicle auto light control device, in which 1 is a head lamp connected to a power source via a head lamp relay 2, and 3 is a head lamp relay ( It is a low beam switch connected to the power source via 2).

4 is a relay driver for the head lamp which receives the control output from the microcomputer 5 and drives the head lamp relay 2, which is composed of R1, R2, transistor T1 and constant voltage diode ZD1.

6 is a small lamp connected to the power supply through the small lamp relay 7, 8 is a small lamp switch connected to the power supply through the small lamp relay 7, and 9 is a control output from the microcomputer 5 ( A small lamp relay driver that receives A) and drives the small lamp, which is composed of resistors R2, R3, transistor T2, and constant voltage ZD2.

In addition, 10 is an auto light switch which is installed independently of the low beam switch 3 and the small lamp switch 8 and constitutes 11 together with them, and 12 is an auto light switch 10 which is a microcomputer 5 ) Is an input interface for an auto light switch. This input interface 12 also consists of resistors R7, R8, condenser C1 and diode D2.

T3 is a transistor whose base is connected between the auto light switch 10 and the input interface 12 through the resistor R5, and a collector of the transistor is connected to the base of the transistor T1. The emitter is grounded. Here, the resistor R6 is connected between the base and the emitter of the transistor T3.

The emitter of the transistor T2 constituting the relay driver 9 is connected between the auto light switch 10 and the input interface 12 via a diode D3. 13 is an input interface for a light end switch connected to a light end signal line connecting the small lamp 6 and the microcomputer 5, which is composed of resistors R9, R10, constant voltage diode ZD3 and capacitor C2. do.

14 is an auto light sensor as an illuminance sensor, which is connected to the microcomputer 5 via an input interface 15 for an auto light sensor, and is composed of resistors R1, R12 and capacitor C3. 16 is an unlit alarm chime, and is connected to the microcomputer 5 via the chime driver 17. As shown in FIG. R18 is a resistor.

Next, the operation will be described with reference to the flowchart of FIG. First, in the manual mode, the head lamp 1 and the small lamp 6 turn the low beam switch 3 or the small lamp switch 8 ON, respectively, and the head lamp relay 2 The lamp is turned on by operating the small lamp relay 7.

In the auto light mode, the low beam switch 3 and the small lamp switch 8 are turned off and the auto light switch 10 is turned on so that the selection signal of the auto light mode is set to the microcomputer 5. Is entered.

Regardless of the auto light mode and the manual mode, the auto light sensor 14 detects the brightness around the vehicle and inputs a signal corresponding to the brightness to the microcomputer 5. In the microcomputer 5, the lighting control and the extinguishing control of the small lamp 6 and the head lamp 1 are performed in accordance with the brightness level. Here, the control of lighting and extinguishing is performed by comparing the setting reference value of three levels with the level of the brightness, for example.

Therefore, the microcomputer 5 outputs a signal for turning on both the head lamp 1 and the small lamp 6 when the brightness is equal to or lower than the first level, which is the lowest level. When the signal (1) is turned off and the small lamp 6 is turned on, the signal for turning off both the head lamp 1 and the small lamp 6 is output when the signal is above the second level and below the third level.

Therefore, the microcomputer 5 always performs a control operation for determining whether to turn on / off according to the illuminance obtained by the auto light sensor 14, and also the small lamp relay 7 according to the ON and OFF of the auto light switch 10. Hardware control of output

In the case where the auto light switch 10 is turned on so that the control output A of the microcomputer 5 for the small lamp relay 7 is turned on, a tail lamp relay driver, that is, a small lamp The transistor T2 of the relay driver 9 is turned on, and thus the small lamp relay 7 is operated to light the small lamp 6. When the auto light switch 10 is turned on, the illuminance calculated so far in the microcomputer 5 is collated and the control is resumed with the illuminance at this cleared point.

Moreover, the lighting and extinguishing conditions of the small lamp in the manual mode and the auto light mode are the same as those of the eighth degree.

On the other hand, based on the light end signal obtained by the small lamp 6 and the ignition switch OFF signal (not shown), when the light end signal is ON and the door is opened, the light off alarm signal is output from the microcomputer 5. Output to the chime driver 17. This allows the alarm chime to be activated to inform the driver of the light off hardness.

(Tasks to be solved by the invention)

However, in such a conventional vehicle auto light control device, when the auto light switch 10 is turned on, the calculation value is cleared and the illuminance at that point is judged, and the calculation is performed. In the case of having hysteresis; i), by starting control from the light-off side, the hardware operates without time delay when the auto light switch 10 is turned on.

However, since the microcomputer 5 recognizes that the auto light switch 10 is turned on after the input processing time (70 to 80 ms) in the chattering avoidance of the auto light switch 10 or the like, the above conditions are not met. Thereby, there was a problem in which the small lamp 6 was turned on instantaneously during the above input processing when outputting an unlit signal as the control output A.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and by using the light signal from the small light once, the temporary lighting of the small lamp can be easily prevented with low cost and simple configuration when the light switch is turned on. It is an object to provide a vehicle auto light control device.

(Configuration to solve the task)

The vehicle auto light control apparatus of the present invention turns off the control output for small lamp lighting to the microcomputer when the output of the haute light switch and the light end signal obtained from the small lamp are each input and the auto light switch is turned off. To install a gate circuit.

(Action)

In the vehicle auto light control apparatus of the present invention, when the auto light switch is OFF and the light once signal used as the light extinction path signal is turned OFF, the auto light switch stops the control operation by the microcomputer, and then the auto light switch is turned ON. The small lamp is prevented from being lit by mistake within the input processing time such as avoidance.

(Example)

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 21 is an OR gate as a gate circuit, and an output terminal of the input interface 12 for auto light switch is connected to one input terminal of the OR gate 21, and the input interface 12 is connected to a sixth gate. Unlike the one shown in the figure, the microcomputer 5 is not directly connected.

On the other hand, the other input terminal of the OR gate 21 is connected to the output terminal of the input interface 13 for switching the write end via an inverter 22, and thus the write end signal is connected to this input terminal. A signal obtained by inverting the signal is input. In addition, since the other circuit structure is as showing in FIG. 5, the overlapping description is abbreviate | omitted.

Next, the operation will be described with reference to the flowchart of FIG. In this flowchart, the lighting and the extinguishing of the small lamp 6 are changed in accordance with the third degree according to the magnitudes of the setting levels a and b of the output level VS which are sensor values of the auto light sensor 14.

First, the microcomputer 5 performs sampling of the combination switch 11 every 10 ms (step ST1) and performs chattering avoidance processing at the time of switching (step ST2). The output (sensor value) is sampled (step ST3).

Next, the microcomputer 5 checks whether the auto light switch 10 is ON or OFF (step ST4), and the light end signal indicating that the auto light switch 10 is OFF and the state of the small lamp 6 is also present. When it is OFF, the control output is turned OFF and the small lamp 6 is turned off (step ST5).

On the other hand, if the auto light switch is ON, it is determined whether the auto light switch is changed from OFF to ON (step ST6). If the auto light switch is changed to ON from OFF, the sensor value is initialized (step ST7). Calculate using the initialized sensor value.

That is, it is determined what size the sensor value VS is with respect to the set values a and b (step ST8). If the surroundings of the vehicle are dark and the sensor value VS is smaller than the set value a (VS ≤ a), the small lamp 6 is turned on. (Step ST9), when the set value is larger than a and smaller than the set value b (a < VS < b), the small ramp 6 is turned off (step ST10), and when the set value is larger than the set value b (VS? B), the light is turned off similarly ( Step ST11).

On the other hand, if the auto light switch 10 is not changed from OFF to ON in step ST6, it is determined whether the sensor has risen or decreased relative to the previous sensor value (step ST12). It is determined whether or not it is larger (step ST13), and when large (VS> b), the small lamp 6 is turned off (step ST14), and when small (VS? B), it is turned on (step ST15).

If it is determined in step ST12 that the sensor value VS is greater than the set value a (step ST16), if it is larger than a (VS> a), the small lamp 6 is turned off (step ST17), If small (VS? A), the lamp is turned on (step ST18).

In the present invention, the control operation is stopped as in the fifth diagram when the auto light switch 10 and the light end signal are OFF using the light end signal obtained by the small lamp 6 for the light extinction warning.

By doing so, it is possible to turn the auto light switch from OFF to ON as in the fourth diagram, and to turn off the operation of the small lamp relay 7 and the small lamp 6 even when the auto light switch 10 is turned on again. It is possible. That is, when the auto light switch 10 is ON, the small lamp 6 can be prevented from momentarily turning on as in the prior art.

5 shows the state of the control output A and the state of the small lamp 6 with respect to the relationship between the input state of the auto light switch 10 and the light end signal with respect to each switch state and the state of the auto light sensor 14. In the present invention, the control output A is turned OFF when the auto light switch 10 and the light end signal are OFF as described above, thereby preventing instantaneous lighting of the small lamp as in the prior art.

1 is a circuit diagram showing a vehicle auto life control apparatus according to an embodiment of the present invention.

2 is a flowchart showing a lighting / lighting control procedure of a small lamp in the present invention.

3 is an explanatory diagram showing a relationship between sensor values and small lamps on and off in the flowchart of FIG. 2;

4 is a flowchart showing signals of respective circuit parts in FIG.

FIG. 5 is a table showing the control states of the combination switch and the small lamp corresponding to the auto light sensor in FIG.

6 is a circuit diagram showing a conventional vehicle auto light control device.

FIG. 7 is a flowchart showing signals of circuit portions in FIG. 6. FIG.

FIG. 8 is a table showing a control state of a small lamp corresponding to the combination switch and auto light sensor in FIG. 6; FIG.

Explanation of symbols on the main parts of the drawings

1: head lamp 3: low beam switch

5: micro-computer

6: small lamp

8: small lamp switch

10: auto light switch

14: auto light sensor

21: gate circuit

As described above, the present invention turns off the control output for small lamp lighting to the microcomputer when the output of the auto light switch and the light end signal obtained by the small lamp are each one input, and the auto light switch is OFF. By employing the structure in which the gate circuit is formed, the light once signal from the small light can be used to easily prevent temporary lighting of the small lamp when the light switch is turned ON at low cost and in a simple configuration.

Claims (1)

1.Auto light switch installed independently against furnace beam switch, small lamp switch, Auto light sensor to detect the brightness around the vehicle, In a vehicle auto light control apparatus having a microcomputer that controls the head lamp or the small lamp to be turned on or off automatically in accordance with the illuminance detected by the auto light sensor when the auto light switch is ON. The output of the auto light switch and the light end signal obtained from the small lamp are each input, and the control output for turning off the small lamp to the microcomputer is turned off when the auto light switch is turned off. Gate circuits Auto light control device for a vehicle, characterized in that provided.