JPH0343062Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a retractable headlamp control device that controls lighting of a retractable headlamp installed at the front of a vehicle by raising it by operating a lighting switch.

Conventionally, in this type of retractable headlamp control device, in order to prevent a retractable headlamp that has been energized to the upward side from continuing to move downward, a drive section limiter has been installed in the control circuit of the retractable headlamp, for example. relays, etc. were installed. The drive unit limiting relay is, for example, a coil that is excited when the small lamp system of the lighting switch is turned on, and a power supply circuit that is installed in a power supply circuit that controls the retractable headlamp to move downward. This relay has a normally closed contact point, and the relay prevents the retractable headlamp from lowering when the lighting switch is turned on.

However, according to the related art, if the fuse of the small lamp system is disconnected for some reason, the coil of the drive section limiting relay becomes de-energized, and therefore the normally closed contact of the relay becomes closed. The retractable headlamp was biased toward the downward direction. In other words, if a fuse in the small lamp system breaks while driving at night, not only will the vehicle's side lights and tail lights, which alert other vehicles to the presence of the vehicle, go out, but the lights in front of the vehicle will also be turned off. The retractable head lamps that provide illumination were also hidden inside the vehicle body, and the vehicle ended up driving without any lights at night, creating a risk of traffic accidents such as rear-end collisions and collisions.

This invention prevents the retractable headlamp from descending by cutting off the power supply line of the motor for raising and lowering the retractable headlamp when the small lamp system fuse breaks, thereby preventing the retractable headlamp from running without the light on. The purpose is to prevent.

A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Reference numeral 1 denotes a drive unit, which includes retractable headlamps 6 installed on the left and right sides of the front of the vehicle.
6' becomes a driving source for raising and lowering. still,
The head lamps 6, 6' have upward filaments 6a, 6a' and downward filaments 6b, 6b'. The drive unit 1 includes the head lamps 6, 6'.
left and right motors 2, 2' that drive the motors up and down from the vehicle body, two control switches 3, 3', and two motor control relays 4, 4' that control the operation of the motors 2, 2'. and monitor lamps 5 and 9
It consists of two backflow prevention diodes _D1 to _D9 .

The control switches 3, 3' operate in conjunction with the rotation of the motors 2, 2', respectively, and control the raising and lowering operations of the head lamps 6, 6'. The right side control switch 3 that controls the right side headlamp 6 includes a movable contact 3a that rotates in conjunction with the rotation of the right side motor 2, and a movable contact 3a that rotates in conjunction with the rotation of the right side motor 2.
Two fixed contact pieces 3 arranged to have sliding contact with a
b, 3c. Furthermore, the movable contact 3a
When the right headlamp 6 is completely retracted into the vehicle body, it is located on the imaginary line A, and the first fixed contact piece 3
When the headlamp 6 is fully extended from the vehicle body, it is located on the imaginary line B and is arranged to be in contact and conduction only with the second fixed contact piece 3c.

The right motor control relay 4 has its coil 4a
One end is connected to the movable contact 3a of the control switch 3, the other end is connected to the ground, the movable contact 4b is grounded via the motor 2, and also grounded via the diode _D1 and the monitor lamp 5, and the normally open fixed contact is connected to the ground. 4c
is connected to a connection point between a small lamp type fuse _F3 , which will be described later, and a terminal g of a lighting switch 8, and a normally closed fixed contact 4d is connected to ground.

In the drive unit 1, the connection configuration of the left motor 2', the left control switch 3', the left motor control relay 4', and the diode _D2 is such that the right motor is connected to the left motor in order to control the left headlamp 6'. 2. The connection configuration is the same as that of the right side control switch 3, the right side motor control relay 4, and the diode _D1 .

8 is a lighting switch. The lighting switch 8 is generally mounted on a steering wheel (not shown), and the switch mechanism can be turned to the OFF position or to the stage where small lamps (not shown) such as side marker lights and tail lamps are turned on. At the same time, the headlamps 6, 6' are turned on at each switch position in the rotation operation by vertically operating the operating knob (not shown) of the lighting switch 8. Switch to the dimer position (D position) where the headlamps 6, 6' are lit upwards, the main position (M position) where the headlamps 6, 6' are lit upwards, and the passing position (position P) where the headlamps 6, 6' are lit upwards for passing. It is configured so that it can be operated. In addition, when operating to P position,
It automatically returns to the D position. Next, the connection configuration at each switch position in the lighting switch 8 will be explained.

The writing switch 8 switches terminals a to j.
Consists of 10 terminals. There is no switch connection when the switch position in the rotation operation is set to the OFF position, the M position and the D position, and the terminals a and b and terminals d and e are connected only when the switch is set to the P position.
Next, when the switch position in the rotation operation is set to the stepped position, terminals g and h are always connected,
Other connections are made between terminals a and b and between terminals d and e when the terminal is in the P position. Also, when the switch position in the rotation operation is set to the step position, the terminals g and h and between the terminals i and j are always connected, and when the switch is set to the M position and P position, the terminals a and b and the terminals are connected at all times. The terminals d and e are connected, and when the terminals are in the D position, the terminals a and c and the terminals d and f are connected, respectively.

Reference numerals 9 and 9' indicate cut relays that limit the lighting of the head lamps 6 and 6' based on the operation of the control switches 3 and 3'.

10 is a lamp sensor that monitors the lighting state of the headlamps 6, 6', and coils 10a, 10b.
, reed switches 10c and 10d, and a monitor lamp 10e.

A lighting control relay 11 controls the lighting state of the upward filaments 6a, 6a' in the headlamps 6, 6' based on the operation of a headlamp control circuit 14, which will be described later.

Reference numeral 12 designates a retractor switch that raises and lowers the head lamps 6, 6' from the vehicle body while the lighting switch 8 remains OFF, and is constructed so that a normally open contact 12a and a normally closed contact 12b are interlocked.

Reference numeral 13 denotes a drive section limiting relay that limits the operation of the drive section 1 based on the operation of the headlamp control circuit 14, and is composed of a coil 13a, a movable contact 13b, a normally open fixed contact 13c, and a normally closed fixed contact 13d. are doing. The drive section limiting relay 13 is a relay for preventing the retractable headlamps 6, 6' from lowering when the lighting switch 8 is turned on when the small lamp system fuse _F3 is in normal condition. That is, the normally closed contact 13d is connected to the second fixed contact piece 3 of the control switch 3.
However, when the coil 13a is excited by turning on the lighting switch 8, the normally closed contact 13d is opened, and the energization to the motor control relays 4 and 4' is stopped. The retractable headlamps 6, 6' are prevented from descending.

Reference numeral 14 denotes a headlamp control circuit that controls the lighting control relay 11 and the drive section limiting relay 13 based on the operation of the drive section 1 and lighting switch 8. The headlamp control circuit 14 includes three NPN transistors T ₁ to T ₃ , capacitors C ₁ and C ₂ , and three Zener diodes D _z1 to T 3 .
D _z3 , seven resistors R ₁ to R ₇ and six diodes D ₁₀ to D ₁₅ .

In the writing switch 8, terminals a,
d, g, and i are connected to the positive electrode of the DC power supply 7 via fuses _F1 to _F3, respectively. Also,
Terminal h is connected to a small lamp.

Next, the operation of the above configuration will be explained.

When the fuse _F3 of the small lamp system is disconnected due to an abnormal condition such as the short of the small lamp, the terminal g of the lighting switch 8 becomes in a no-voltage state.

Therefore, coil 1 of drive section limiting relay 13
3a is in a de-energized state, the movable contact 13b is brought into contact with the normally closed contact 13d, and the coils 4a, 4 of the motor control relays 4, 4' are connected via the control switch 3.
Excitation current is applied to a′. Therefore, the movable contact 4
b, 4b' are contacted with normally open contacts 4c, 4c'. However, the normally open contacts 4c and 4c' are connected to the fuse _F3 of the small lamp system, and when the fuse _F3 of the small lamp system is disconnected, operating current is supplied to the motors 2 and 2'. Never.

It should be noted that the above embodiment may be used as motor control relays 4, 4'.
A similar effect can be obtained by connecting the normally open contacts 4c and 4c' of the DC power source 7 only to the positive pole of the DC power source 7, and connecting the movable contact 13b of the drive section limiting relay 13 only to the terminal g of the writing switch 8. That is,
When fuse _F3 of the small lamp system is disconnected,
Since the movable contact 13b is always in a non-voltage state, the movable contacts 3a and 3 in the control switches 3 and 3'
Even if a' is in contact with the second fixed contact piece 3c at the imaginary line B position, the motor control relays 4, 4'
Since the coils 4a, 4a' are not energized, the motors 2, 2' do not operate and do not lower the headlamps 6, 6'.

Since it has the above structure and operation, the following effects are achieved.

Connect the normally closed contact and movable contact of the motor control relay of the motor for driving the retractable headlamp up and down between both terminals of the motor, and connect the normally open contact to the connection point between the small lamp system fuse and the lighting switch. Therefore, even if the small lamp fuse breaks and the small lamp goes out while driving at night, the retractable headlamp will not be hidden inside the vehicle body. , driving without lights is prevented, which prevents rear-end collisions and collisions, making it extremely effective for traffic safety.

[Brief explanation of drawings]

The drawing is an electrical circuit diagram showing an embodiment of a retractable headlamp control device according to the present invention. 2, 2'... Motor, 4, 4'... Motor control relay, 6, 6'... Head lamp, 8... Lighting switch, 13... Drive section limit relay, F ₃ ... Small lamp system. Hughes.

Claims (1)

[Claims for Utility Model Registration] A lighting switch having operating positions for a small lamp and a headlamp, a DC power supply connected to the input side of the lighting switch via a fuse, and a control switch on the output side of the lighting switch. In a retractable headlamp control device comprising a motor control relay connected via a motor control relay, and a retractable headlamp raising and lowering drive motor connected to the motor control relay, the motor control relay comprises: It has a normally closed contact, a normally open contact, and a movable contact, and the normally closed contact and the movable contact are connected between both terminals of the motor, and the normally open contact is connected to a connection point between a small lamp system fuse and a lighting switch. A retractable headlamp control device characterized by: