JPH033074Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a vehicle headlight control device that controls turning on or off of headlights according to vehicle speed or engine rotational speed, and in particular, to The present invention relates to an improved vehicle headlight control device that prevents malfunctions.

BACKGROUND ART Conventionally, when driving at night, when a vehicle is stopped at a traffic light or the like, the headlights are turned off out of consideration for the driver of the vehicle in front or the oncoming vehicle.

For this reason, control devices have been put into practical use that turn on or off headlights depending on the speed of the vehicle or the engine speed.

FIG. 2 is a schematic wiring diagram showing a power supply line for a general vehicle headlamp.

In the figure, 1 is a light switch installed inside the vehicle, for example next to the steering wheel, and headlight 4
and the lighting position a of the vehicle width light, the lighting position b of the vehicle width light,
It has three switching contacts, one for the headlights 4 and one for the off position c of the side marker lights.

Reference numeral 2 denotes an interlocking switch that is switched in conjunction with the switching of the light switch 1, and when the light switch 1 is switched to the switching contact a, the contacts d and e are electrically connected.

3 is the downward lamp of headlight 4 (low beam)
5 and an upward lamp (high beam) 6. It is installed in the vehicle interior together with the light switch 1, and the low beam 5 is turned on at the contact Lo side, and the high beam 6 is turned on at the contact Hi side. Ru.

With this configuration, when the light switch 1 is switched to the switching contact b, the power +B from the battery is supplied to the not-illustrated sidemarker lights and rear lights, and the sidemarkers and rear lights are turned on. At this time, since the contacts d and e of the interlocking switch 2 are not connected, the headlight 4 remains off.

Next, when the light switch 1 is switched to the switching contact a, the contacts d and e of the interlocking switch 2 are connected, so power +B from the battery is also supplied to the headlights 4, and the vehicle width In addition to the headlights and rear lights, the headlights 4 are also turned on.

FIG. 3 is a block diagram of a conventional vehicle headlamp control device.

In the figure, the control device 7 detects the vehicle speed or engine rotation speed, and the vehicle speed is set to a predetermined speed (for example, 5 km/h).
h) When the engine speed is below or below a predetermined speed (1500 rpm), the relay switch 8 is shut off, and when the speed is above the predetermined speed or above the predetermined speed, the relay switch 8 is turned on. Reference numeral 9 denotes an automatic/manual changeover switch, which when turned on activates the control device 7 to set the automatic mode; when turned off, the switch turns into the manual mode and keeps the relay switch 8 in a conductive state at all times. 10 is a power input terminal of the control device 7.

When installing this headlight control device on a vehicle,
Cut the connection line between contact e of interlock switch 2 and contact f of Hi/Lo changeover switch 3, connect terminals i and g of the headlamp control device to contact e of interlock switch 2,
This is also done by connecting the terminal h to the contact f of the Hi/Lo changeover switch 3, and by connecting the vehicle speed or engine speed signal input terminal 11 to the vehicle speed or engine speed signal supply line of the vehicle.

As a result, when the automatic/manual changeover switch 9 is turned on and the light switch 1 is switched to the changeover contact a, power +B is supplied from the battery to the power input terminal 10 of the control device 7 via the interlocking switch contacts d and e. be done. Therefore, the headlight 4 is turned on only when the vehicle speed is above a predetermined vehicle speed or when the engine speed is above a predetermined speed.

Problems that the invention aims to solve: However, with this configuration, if the control device or relay switch fails and the relay switch is not conductive, no power is supplied to the headlights and the headlights cannot be turned on. There was a problem that I couldn't do it.

The present invention has been developed in view of these conventional problems, and even if the control device or relay switch malfunctions, the headlights can be turned on or off, and the present invention is compatible with existing light switches and front lights. The object of the present invention is to provide a vehicle headlight control device capable of automatically or manually switching the lighting of headlights using power lines for headlights and sidemarker lights.

Means for Solving the Problem In order to achieve the above object, the present invention provides a connection between a power source and a headlamp and a vehicle width light, through each power supply line. a light switch that selectively supplies power to the lamp; a switch interposed between the power source and the headlamp;
A control device that detects vehicle speed or engine rotation speed and controls connection of the switch according to the vehicle speed or engine rotation speed, and a connection between the power supply line of the side marker light and an input terminal of the control device. a self-holding type switch having a starting power input terminal connected to a power supply line of the headlamp, and a self-holding type switch having a starting power input terminal connected to a power supply line of the headlamp; The present invention is characterized in that the relay switch is brought into conduction and maintained in the conduction state by switching its connection state to a position where power is supplied to the side marker lights.

Effects According to the present invention, since it has the above-mentioned configuration, the control device can be operated in a state where the side marker lights are turned on. Therefore, the control device can operate independently of the vehicle's headlight power supply line, so even if the control device or relay switch fails, the headlights can be turned on via the original power supply line to the headlights. It becomes possible to turn the light on or off. Moreover, the headlights can be switched on and off automatically or manually by operating the existing light switch that switches on and off the headlights or side lights.
There is no need to separately provide a manual changeover switch.

Examples of ideas The present invention will be explained below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and parts given the same reference numerals as in FIG. 2 indicate those having the same functions.

In the figure, 21 is a vehicle headlight control device according to the present invention, and terminals i and k are connected to the vehicle headlight 4.
and the terminal l to the power supply line 13 to the side lamp of the vehicle, respectively, and the vehicle speed or engine speed signal input terminal 26 to the vehicle speed or engine speed signal supply line of the vehicle. It is attached to the vehicle by connecting.

The starting power input terminal of the self-holding relay switch 24 is grounded via the diode D and the coil L of the self-holding relay switch 24, and the connection point between the diode D and the relay switch 24 is connected to the control device 2.
It is connected to the power input terminal 25 of No. 2. The terminal l is connected to the other end of the relay switch 24, and the other end m of the relay switch 23 is connected to the terminal l and the relay switch 24.
connected to the connection point.

The control device 22 inputs a vehicle speed signal or an engine rotation speed signal, performs signal processing such as smoothing, compares it with a reference level using a comparator, and delays this comparison output for a predetermined period of time (about 4 to 5 seconds). The relay switch 23 is configured to be turned on or off depending on the signal received. That is, after a predetermined time (about 4 to 5 seconds) has elapsed since the vehicle speed became less than a predetermined speed (for example, 5 km/h) or the engine speed became less than a predetermined number of revolutions (for example, 1500 rpm), the relay switch 23
cut off. Further, the relay switch 23 is turned on after a predetermined period of time has elapsed since the vehicle speed reached a predetermined speed or the engine speed reached a predetermined speed or higher.

When the headlight control device 21 automatically turns on or off the headlights 4 depending on the vehicle speed or engine speed, first the light switch 1 is switched to the switching contact a. As a result, the interlocking switch 2 is switched, contacts d and e are connected, power +B from the battery is supplied to the headlight 4, and the coil L of the relay switch 24 is connected via the diode D.
The relay switch 24 becomes conductive.
Therefore, the power supply +B is also supplied to the power supply input terminal 25 of the control device 22 via the diode D or the relay switch 24. Next, when the light switch 1 is switched to the switching contact b, the interlocking switch 2 is switched, and the contacts d and e are cut off, and the power +B is no longer supplied to the power supply line 12 to the headlight.
However, since power +B continues to be supplied to the power supply line 13 to the sidemarker lights, power +B is supplied to the control device 22 via the relay switch 24. Therefore, from now on, by the action of the control device 22,
Depending on the vehicle speed or engine rotation speed, the power supply +B is supplied or cut off to the headlight 4 via the relay switch 23, and the headlight 4 is automatically turned on and off.

When light switch 1 is switched to switching contact c,
Power +B is no longer supplied to the power supply line 13 to the sidemarker lights, the relay switch 24 is cut off, and the power supply to the control device 22 is cut off.

Therefore, the headlight 4 remains off.

According to this configuration, since the control device 22 operates independently of the power supply line 12 of the headlight, even if the control device 22 or the relay switch 23 breaks down, the light switch 1 can be switched to the contact a.
By switching to , power +B can be supplied to the headlamp 4 via the power supply line 12 to the headlamp,
It is possible to prevent problems such as the inability to turn on the headlights 4 due to a failure of the control device 22 or the relay switch 23.

Further, there is no need to separately provide an automatic/manual changeover switch in the headlight control device 21.

The control device 22 uses a hysteresis comparator or the like to determine the speed at which the relay switch 23 is turned off (for example, 1 to Km/h) or the engine rotation speed (for example, 1000 rpm) and the speed at which the relay switch 23 is turned on (for example, 10 Km/h). h) or engine rotation speed (for example, 2000 rpm).

Further, the control device 22 may be realized by a microcomputer.

Furthermore, one end m of the relay switch 23 is not a connection point between the terminal l and the relay switch 24, but a contact point e.
Alternatively, it may be connected directly to the battery.
In this way, the length of the electric wire for power supply can be shortened, and problems such as the headlight 4 becoming dark due to a voltage drop in the electric wire can therefore be prevented.

Effects of the Invention As described above in detail, according to the present invention, it is possible to prevent the inconvenience of not being able to turn on the headlights due to a failure of the control device or relay switch.
Moreover, the headlights can be switched on and off automatically or manually by operating the existing light switch, and there is no need to provide a separate automatic/manual switch for the headlights, so the configuration does not become complicated. do not have.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a schematic wiring diagram showing a power supply line for a general vehicle headlamp, and FIG. 3 is a block diagram of a conventional example. In the figure, 1 is a light switch, 2 is an interlocking switch, 4 is a headlamp, 21 is a vehicle headlight control device, 22 is a control device, 23 is a relay switch, 2
4 is a self-holding relay switch.

Claims (1)

[Scope of Claim for Utility Model Registration] A light switch that is connected between a power source and a headlamp and a side lamp, and selectively supplies power to the headlamp and side lamp through each power supply line, respectively. a switch interposed between the power source and the headlamp; a control device that detects vehicle speed or engine rotation speed and controls connection of the switch according to the vehicle speed or engine rotation speed; a self-holding switch having a relay switch connected between a power supply line of the side lamp and an input terminal of the control device, and a starting power input terminal connected to the power supply line of the headlamp; By operating the light switch and switching its connection state from a position where power is supplied to the headlights to a position where power is supplied to the side marker lights, the relay switch becomes conductive and the conductive state is maintained. A vehicle headlight control device characterized in that: