JP2780197B2 - Headlamp control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control device for a headlamp, which is suitable for being applied to a motorcycle in which a headlamp is turned on even during daytime running.

(Conventional technology) A motorcycle has a smaller frontal area than a car, making it difficult to confirm from a distance. In addition, on a highway or the like, a motorcycle generally approaches in a shorter time than a car. In order to increase the visibility of the running vehicle, it is recommended that headlights be turned on even during daytime driving, and some countries require it.
For this reason, some vehicles automatically turn on the headlamp when the engine is started. However, there are still many vehicles in which the driver turns on the lighting switch and turns on the light. In any case, it is needless to say that it is better to drive while turning on the headlamp especially on a highway.

(Problems to be Solved by the Invention) As described above, when the headlamps are turned on even during traveling in the daytime, there are the following problems. That is, since the headlights are lit during the daytime in addition to the nighttime, the life of the headlamp is shortened. A horizontally cut low beam has poor visibility when driving in the daytime. On the other hand, the high beam has good visibility in the daytime, but it gives an illusion to the driver who looks at the rearview mirror of the oncoming vehicle and the vehicle running ahead. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problem that occurs when a headlight is turned on in the daytime as it is.

(Means for Solving the Problems) As a means for solving the above-mentioned problems, the present invention relates to a method in which a high beam 21 and a low beam 24 of a headlamp are connected via contacts of a relay 12 (fixed contacts 20, 22 and movable contacts 15). Light-receiving element (CdS7) that connects to the power supply (coil 1 of the generator) and detects the surrounding brightness and converts it into an electric signal
And a control circuit (relay circuit 6) that acts on the light receiving element to receive the output of the light receiving element, switch the contact 15 of the relay 12 to the high beam 21 side, and at the same time lower the voltage applied to the headlamp. ) Are connected.

(Operation) With such a configuration, when the headlamp is turned on during driving in a bright daytime environment, the headlamp always becomes the high beam 21 and the voltage applied to the headlamp becomes low. This does not give any illusion to the person, and also significantly improves the visibility from a distance.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes an output coil of a generator (magnet).
When the engine operates, an AC voltage is generated between both ends. One end of the coil 1 is connected to a ground circuit to form a common circuit on the negative side, and the other end is connected to a series circuit of a fuse 3 and a battery 4 via a regulator circuit (including a rectifier circuit) 2 and one pole of an ignition switch 5. It is connected to the. The other pole of the ignition switch 5 is a relay circuit 6
Is connected to one end of CdS7. CdS7 is a well-known light receiving element, and its resistance value changes according to the brightness of the surroundings, and when it is bright, the resistance value decreases. this
CdS7 is fixed around the meter or steering wheel of the motorcycle.

A resistor 8 is connected in parallel to CdS7, and two resistors 9, 10 are connected in series between the other end and the ground circuit. The connection point of the resistors 9 and 10 is connected to the base of the transistor 11, and is turned on and off by this divided voltage. The emitter of the transistor 11 is connected to a ground circuit, and the collector is connected to one end of the coil 13 of the relay 12. The coil 13 is connected in parallel with the resistor 14, and the other end is connected to the ignition switch 5. The relay 12 is provided with two sets of switching circuits. One of the movable contacts 15 is connected to the ON contact 17 of the lighting switch 16. Lighting switch 16
Of the coil 1 is connected to the intermediate tap 1a of the coil 1.

A high beam 21 of a headlamp is connected between one fixed contact 20 of the two fixed contacts to which the movable contact 15 of the relay 12 selectively contacts and the grounding circuit, and the other fixed contact 22 A low beam 24 of a headlamp is connected to a ground circuit via a dimmer switch 23. A load 25 other than a headlamp is connected between the on contact 17 of the dimmer switch 16 and the ground circuit, and a daytime dummy resistor 26 is connected to the off contact 18. The movable contact 27 of the relay 12 is connected to a voltage adjusting resistor 29 of a regulator connected to the output side of the rectifier. The fixed contact 30 is connected to a resistor 31 connected to the output side of the rectifier 28. The fixed contact 32 is not connected anywhere.

The control device thus configured operates as follows. The ignition switch 5 is turned on to start the engine. When the headlights are turned on during the daytime, the lighting switch 16 is turned on first. Since the daytime is bright, the resistance value of CdS7 is small, so that the transistor 11 is turned on. Transistor 11
Is turned on, a current flows through the coil 13 of the relay 12, so that the coil 12 is excited and the movable contact 15 contacts the fixed contact 20. Thereby, the high beam 21 is turned on.

When operating in this manner, the other movable contact 27 of the relay 12
Are also interlocked and come into contact with the fixed contact 30. As a result, the resistor 30 is connected in parallel with the resistor 29 for adjusting the voltage of the regulator, so that the adjustment voltage of the regulator is reduced. When operating in this way, the dimmer switch 23 is generally in contact with the high beam side, but even if it is in contact with the low beam side, the relay 12
As a result, a voltage is directly applied to the high beam side.

During night driving, the resistance value of CdS7 increases because the surroundings are dark. As a result, the transistor 11 is turned off. When the transistor 11 is turned off, the coil 13 of the relay 12 is de-energized.
Will touch the side. When the movable contact 15 is switched to the fixed contact 22 in this way, the current from the lighting switch 16 is supplied to the headlamp via the dimmer switch 23. Therefore, when the dimmer switch 23 is L, the low beam and H In this case, the high beam is turned on. At this time, the other movable contact 27 of the relay 12 contacts the fixed contact 32 and releases the parallel state of the resistor 31 and the resistor 29, so that the regulator returns to the normal adjustment voltage. . FIG. 2 shows the lamp voltage during night driving, and the lamp voltage during day driving.

In the embodiment described above, CdS
However, the present invention is not limited to this.
It goes without saying that other light receiving elements may be used.

(Effect of the Invention) Since the present invention is a headlamp control device configured as described above, when the headlamp is turned on during daytime traveling, a high beam is always provided, so that visibility from a distance is improved. At this time, since the voltage applied to the headlamp is reduced, the life of the headlamp is not shortened.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of one embodiment of the present invention, and FIG. 2 is a graph showing a voltage state. 1 ... coil 6 ... relay circuit 7 ... CdS 12 ... relay 13 ... coil 15, 27 ... movable contact 20, 22, 30, ... fixed contact 21 ... high beam 24 ... low beam

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60Q 1/14 H05B 37/02

Claims (1)

(57) [Claims] 1. A high-light and a low-beam of a headlamp are connected to a power supply through a contact of a relay, and a light-receiving element for detecting ambient brightness and converting it into an electric signal is provided. A control device for a headlamp, comprising: a control circuit for switching a contact point of the relay to a high beam side in response to an output of the element, and at the same time, connecting a control circuit acting to reduce a voltage applied to the headlamp.