JPH07195973A - Auto light control device for vehicle - Google Patents

Abstract

PURPOSE:To easily prevent a small lamp from being temporarily lighted in a simple constitution at low cost when a light switch is turned on by making use of a light single signal from the small light. CONSTITUTION:A gate circuit 21 is provided, which allows a control output for lighting a small lamp to a microcomputer 5 to be turned off while the output of an auto light switch 10 and a light single signal obtained by the small lamp 6 are being made to be one output by each when the auto light switch 10 is turned off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular autolight control device for controlling lighting and extinction of headlights and small lamps based on an illuminance value taken in by an autolight sensor.

[0002]

2. Description of the Related Art FIG. 6 is a circuit diagram showing a conventional vehicle automatic light control device. In FIG. 6, 1 is a headlamp connected to a power source (battery) through a headlamp relay 2 and 3 is a head. It is a low beam switch connected to the power source via a lamp relay 2.

Reference numeral 4 denotes a headlamp relay driver for driving the headlamp relay 2 in response to a control output from the microcomputer 5, which are R1 and R.
2. A transistor T1 and a constant voltage diode ZD1.

Further, 6 is a small lamp connected to the power source through the small lamp relay 7, 8 is a small lamp switch connected to the power source through the small lamp relay 7, and 9 is a signal from the microcomputer 5. A relay driver for a small lamp that receives the control output A and drives the small lamp.
3, R4, transistor T2 and constant voltage diode Z
It consists of D2.

Further, 10 is provided independently of the low beam switch 3 and the small lamp switch 8,
In addition, the automatic light switch and the automatic light switch 12 which constitute the combination switch 11 together with these are the automatic light switch 1
0 is an input interface for an auto light switch that connects 0 to the microcomputer 5. The input interface 12 includes resistors R7, R8 and a capacitor C1.
And a diode D2.

Further, the base of T3 is an auto light switch 10 and an input interface 1 via a resistor R5.
A transistor connected between two transistors, the collector of which is connected to the base of the transistor T1 and the emitter of which is grounded. Here, a resistor R6 is connected between the base and emitter of the transistor T3.

The emitter of the transistor T2 which constitutes the relay driver 9 is connected between the auto light switch 10 and the input interface 12 via a diode D3. Reference numeral 13 denotes an input interface for a light one-stage switch connected to a light one-stage signal line connecting the small lamp 6 and the microcomputer 5, which includes resistors R9, R10 and a constant voltage diode Z.
It consists of D3 and capacitor C2.

Reference numeral 14 denotes an auto light sensor as an illuminance sensor, which is connected to the microcomputer 5 via an input interface 15 for the auto light sensor, and has resistors R11 and R12 and a capacitor C.
It consists of three. Further, 16 is an alarm chime for which the light is forgotten to be turned off, and is connected to the microcomputer 5 via a chime driver 17. R18 is a resistance.

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

In the auto light mode, the low beam switch 3 and the small lamp switch 8 are also provided.
Is turned off, the auto light switch 10 is turned on, and an auto light mode selection signal is input to the microcomputer 5.

On the other hand, 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 according to the brightness to the microcomputer 5. The microcomputer 5 controls the lighting and extinguishing of the small lamp 6 and the headlamp 1 according to the brightness level. Here, these lighting and extinguishing controls are performed by comparing, for example, three-level setting reference values with the above-mentioned brightness levels.

Therefore, when the brightness is below the lowest level of the first level, the microcomputer 5 outputs a signal for turning on both the headlamp 1 and the small lamp 6, which is above the first level and below the second level. In the case of, a signal for turning off the headlamp 1 and for turning on the small lamp 6, and for a signal exceeding the second level and below the third level, a signal for turning off both the headlamp 1 and the small lamp 6, respectively. Output.

By the way, the microcomputer 5 always carries out a control calculation for deciding on / off of light based on the illuminance value taken in by the auto light sensor 14, and moreover, the small lamp is turned on / off by turning on / off the auto light switch 10. The output of the relay 7 is controlled by hardware.

Under the condition that the auto light switch 10 is turned on and the control output A of the microcomputer 5 for the small lamp relay 7 is turned on, the transistor 2 of the tail lamp relay driver 9 is turned on,
As a result, the small lamp relay 7 operates and the small lamp 6 lights up. And the auto light switch 1
When 0 is turned on, the illuminance value calculated up to now in the microcomputer 5 is cleared, and the control is restarted at the illuminance value at the time of this clearing.

The lighting and extinguishing states of the small lamp in the manual mode and the automatic light mode are as shown in the table of FIG.

On the other hand, based on the light one-step signal obtained from the small lamp 6 and an ignition switch-off signal (not shown), when the light one-step signal is on and the door is opened, the microcomputer 5 outputs the signal. The write forgetting signal is output to the chime driver 17. By doing so, the alarm chime can be activated to warn the driver leaving the car that he / she has forgotten to turn off the light.

[0017]

However, in this conventional vehicle autolight control device, the above calculated value is cleared when the autolight switch 10 is turned on, and the illuminance at that time is determined. When the illuminance has hysteresis as shown in FIG. 7,
By starting the control from the light-off side, the hardware operates without a time delay when the auto light switch 10 is turned on.

However, the input processing time (70 to 80) for avoiding chattering of the auto light switch 10 or the like.
ms) later, the microcomputer 5 recognizes that the auto light switch 10 is turned on. Therefore, when the extinguishing signal is output as the control output A under the above conditions, the small lamp 6 is momentarily operated during the input process. There was a problem that lights up.

The present invention has been made by paying attention to the conventional problems as described above, and by using the light one-stage signal from the small light, it is possible to temporarily turn on the small lamp at a low cost when the light switch is turned on. An object of the present invention is to obtain a vehicle auto light control device that can be easily prevented with a simple configuration.

[0020]

A vehicle auto light control device according to the present invention uses the output of the auto light switch and a light one-stage signal obtained from the small lamp as one input, and turns off the auto light switch. At times, a gate circuit for turning off the control output for lighting the small lamp to the microcomputer is provided.

[0021]

In the vehicle autolight control device according to the present invention, when the autolight switch is off and the light one-step signal used as the light-off forgetting alarm signal is also off, the control calculation by the microcomputer is stopped. This prevents the small lamp from being erroneously turned on within the time for input processing such as chattering avoidance after the auto light switch is turned on.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 21 is an OR gate as a gate circuit, and one input terminal of this OR gate 21 has an input interface 12 for an auto light switch.
Output terminals are connected, and the input interface 12 is not directly connected to the microcomputer 5 unlike the one shown in FIG.

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 the write one-stage switch through the inverter 22. Therefore, the write one-stage is connected to this input terminal. A signal obtained by inverting the signal is input. Since the other circuit configurations are the same as those shown in FIG. 5, duplicated description thereof will be omitted.

Next, the operation will be described with reference to the flowchart of FIG. In this flowchart, it is assumed that the small lamp 6 is switched on and off according to the magnitude of the output level VS, which is the sensor value of the auto light sensor 14, with respect to the set levels a and b. To do.

First, the microcomputer 5 performs sampling of the combination switch 11 every 10 ms (step ST1), and further performs chattering avoidance processing during switching (step ST2), and then outputs the output of the auto light sensor 14 (sensor value). ) Is sampled (step ST3).

Next, the microcomputer 5 checks whether the auto light switch 10 is on or off (step ST
4) If the auto light switch 10 is off and the light one-stage signal indicating the state of the small lamp 6 is also off, the control output is turned off and the small lamp 6 is turned off (step ST5).

On the other hand, when the auto light switch is on, it is determined whether the auto light switch is switched from the off state to the on state (step ST
6) When the off state is switched to the on state, the sensor value is initialized (step ST7).
Calculation is performed using this initialized sensor value.

That is, it is determined how the sensor value VS is with respect to the set values a and b (step ST
8) When 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), and the set value b is larger than the set value a.
If it is smaller (a <VS <b), the small lamp 6 is turned off (step ST10), and if it is larger than the set value b (VS ≧ b), it is also turned off (step ST1).
1).

On the other hand, if it is not the case that the auto light switch 10 is switched from off to on in step ST6, it is judged whether the auto light switch 10 has increased or decreased with respect to the previous sensor value (step ST12), and it is increased. If it is, the sensor value VS is judged whether it is larger than the set value b (step ST13).
> B), the small lamp 6 is turned off (ST14), and if it is smaller (VS ≦ b), it is turned on (step ST).
15).

Further, when it is determined in step ST12 that the sensor value VS has dropped, it is determined whether or not the sensor value VS is larger than the set value a (step ST16), and when it is larger than a (VS> a). , The small lamp 6 is turned off (step ST17), and when smaller than a (VS ≦ a),
It is turned on (step ST18).

In the present invention, the light one-step signal obtained by the small lamp 6 is used as a warning for forgetting to turn off the light, and when the auto light switch 10 and the light one-step signal are off, as shown in FIG. Stop the control calculation.

As a result, as shown in FIG. 4, the control signal A can be turned off after the auto light switch is turned off, and even when the auto light switch 10 is turned on again, the small lamp relay 7 and the small lamp relay 7 are turned on. The operation of the lamp 6 can be turned off. That is, when the auto light switch 10 is turned on, it is possible to prevent the small lamp 6 from being momentarily lit as in the conventional case.

FIG. 5 shows the relationship between the input state of the auto light switch 10 and the one-stage light signal with respect to each switch state and the state of the auto light sensor 14.
The state of the control output A and the state of the small lamp 6 are displayed. In the present invention, the control output A is turned off when the auto light switch 10 and the light one-stage signal are off as described above, and It prevents the small lamp from flashing for a moment.

[0034]

As described above, according to the present invention, the output of the auto light switch and the light one-stage signal obtained from the small lamp are used as one input, and when the auto light switch is turned off, the microcomputer is turned on. Since the gate circuit that turns off the control output for lighting the small lamp is provided to, by using the light one-stage signal from the small light, the temporary lighting of the small lamp when the light switch is turned on is low cost. In addition, there is an effect that a simple structure can be easily prevented.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a vehicle autolight control device according to an embodiment of the present invention.

FIG. 2 is a flow chart showing a procedure for controlling lighting / extinguishing of a small lamp according to the present invention.

FIG. 3 is an explanatory diagram showing a relationship between a sensor value and lighting and extinguishing of a small lamp in the flowchart of FIG.

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

5 is a table showing a control state of small lamps corresponding to the combination switch and the auto light sensor in FIG. 1. FIG.

FIG. 6 is a circuit diagram showing a conventional vehicle autolight control device.

FIG. 7 is a flowchart showing signals of respective parts of the circuit in FIG.

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

[Explanation of symbols]

 1 Head Lamp 3 Low Beam Switch 5 Microcomputer 6 Small Lamp 8 Small Lamp Switch 10 Auto Light Switch 14 Auto Light Sensor 21 Gate Circuit

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[Procedure amendment]

[Submission date] January 11, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 7]

[Fig. 2]

[Figure 6]

[Figure 8]

Claims (1)

[Claims] 1. An auto light switch provided independently for a low beam switch and a small lamp switch, an auto light sensor for detecting brightness around a vehicle, and the auto light sensor when the auto light switch is turned on. In a vehicle autolight control device including a microcomputer that automatically turns on or off a headlamp or a small lamp according to the illuminance to be detected, an output of the autolight switch and a light one-step signal obtained by the small lamp And a gate circuit for turning off the control output for lighting the small lamp to the microcomputer when the auto light switch is turned off.