JPH10258678A - Headlight control device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of sorts of electrical connection boxes and use constitution of wire harness in common by composing a circuit correspond ing to DRL (daytime running light) function, of a separate body from the electri cal connection box, and unifying internal constitution of the electrical connection box according to DRL correspondence and not corresponding to DRL. SOLUTION: An electrical connection box 1 is disposed between a battery and lateral headlights, and has a built-in power supply circuit for supplying power to the headlights from the battery. A control unit is formed of a separate body from the electrical connection box 1, and has a built-in circuit for controlling the action of the power supply circuit. The electrical connection box 1 is provided with a power terminal PV1, first to sixth terminals P1-P6 and an earth terminal PE1 serving as supply terminals connected into predetermined circuit positions of the built-in power supply circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile headlamp control device for controlling the lighting of a headlamp provided in an automobile.

[0002]

2. Description of the Related Art In Northern Europe and North America, especially in winter, the amount of sunshine is small even during the daytime. Therefore, in order to save the driver from forgetting to turn on the lamp switch and to save the trouble of operating the switch, the vehicles sold in these countries have DR
A lamp control system called L (Daytime Running Light) is provided.

For example, according to a DRL provided in a car sold in Canada, when the ignition switch is turned on and the parking brake is turned off, and the headlamp switch is not turned on, the headlamp is turned off. The high beam is dimmed from normal use and lights up. When the driver turns on the headlamp switch, the illuminance of the headlamp returns to the normal level and returns to the normal lamp operation.

Further, once the DRL is turned on, it must not be turned off even if the parking brake is applied. The lights do not turn off even if the engine stalls. Turn off the light when the ignition switch is turned off. While DRL is lit, the headlamp cannot be switched between high and low. These restrictions are implemented using a plurality of relays and a logic circuit that controls switching of the relays.

FIG. 8 shows a conventional DRL-compatible headlamp control circuit. The left and right head lamps B1, B2 are provided with high beam lamps L11, L21 and low beam lamps L12, L22, respectively.

In normal use, the headlamp B
To turn on the high beam lamps L11 and L21 of B1 and B2, the control unit 11 turns on the relay RL1, turns on the relays RL11 and RL12, and connects the relay RL13 to the terminal A.

In this connection state, the high beam lamp L1
1, the left end of L21 is grounded to ground by a relay RL11, and the right end of the high beam lamp L11 is a relay R.
Connected to the + terminal of the battery via L12, RL1,
The right end of the high beam lamp L21 is the relay RL13, R
It is connected to the + terminal of the battery via L12 and RL1. Thus, between the battery positive terminal and the earth line, will be high beam lamp L11, L21 is connected in parallel to each high beam lamp L11, L21 battery voltage V _B is applied, the high beam lamp L1
1, L21 is lit with normal illuminance.

On the other hand, when the DRL is operated, the control unit 11 turns on the relay RL1, turns off the relay RL11, turns on the relay RL12,
The relay RL13 is connected to the terminal B (the state of FIG. 8).

In this connection state, the high beam lamp L1
1 is connected to the + terminal of the battery via relays RL12 and RL1, the right end of the high beam lamp L21 is grounded via the relay RL13, and the connection point between the high beam lamp L11 and the high beam lamp L21 is the relay RL11. Cuts off the connection to ground. Therefore, the high beam lamps L11 and L21 are connected in series between the + terminal of the battery and the ground line.
When a voltage of V _B / 2 is applied, each high beam lamp L1
1, L21 is turned on with illuminance reduced from normal illuminance.

On the other hand, in the case of an automobile for a country that does not require a DRL function, it is sufficient that the high beam lamps L11 and L21 can be illuminated with a constant illuminance. A circuit was used.

[0011]

In the above-mentioned conventional DRL headlamp control circuit, it is necessary to satisfy both the dimmed lighting for DRL and the lighting at normal illuminance.
As shown in (1), the configuration of the wire harness is complicated.

Also, as shown in FIGS. 8 and 9, the interior of the electric connection box 11 is different between a vehicle for a country requiring a DRL function and a vehicle for a country not requiring a DRL function. As the number of types of the electric connection box 11 increases, the configuration of the wire harness for connecting the electric connection box 11 and the left and right headlamps B1 and B2 becomes different, and the number of types also increases.

[0013] The present invention solves the above-mentioned problems and provides a D
The circuit for supporting the RL function is configured separately from the electrical junction box, and the internal configuration of the electrical junction box is unified between DRL compatible and non-DRL compatible. It is an object of the present invention to provide a headlamp control device for a vehicle that allows a common configuration of a wire harness.

[0014]

SUMMARY OF THE INVENTION The present invention relates to an automobile headlamp control apparatus for controlling power supply from a power supply to left and right headlamps having a high beam lamp and a low beam lamp, respectively. An electric connection box provided between the lamp and the power supply circuit for supplying the electric power, and a circuit formed separately from the electric connection box for controlling the operation of the electric power supply circuit. A built-in control unit, the electric connection box includes a plurality of supply terminals connected to predetermined circuit positions of the built-in power supply circuit, and the control unit includes a predetermined circuit of the built-in circuit. A plurality of unit terminals connected to the circuit position, and a predetermined terminal among the supply terminals of the electric connection box and the unit of the control unit. A predetermined terminal of the bets terminal is configured to be connected (claim 1).

According to this configuration, the predetermined terminal among the supply terminals connected to the predetermined circuit position of the power supply circuit built in the electric connection box and the circuit of the circuit built in the control unit are connected. By being configured to be connectable to a predetermined terminal among the unit terminals connected to a predetermined circuit position, control can be performed on an electric connection box incorporating a power supply circuit having the same circuit configuration. Only by changing the circuit built in the unit, the control of the operation of the power supply circuit is changed. Further, even if the circuit incorporated in the control unit is changed, the wiring harness between the electric connection box and the left and right head lamps is shared because the inside of the electric connection box has the same circuit configuration. .

Further, in the vehicle headlamp control device according to the present invention, there is provided an automobile headlamp control device, wherein the electric connection box includes a lamp terminal, and a power supply terminal connected to the power supply as the supply terminal. A ground terminal connected to one end of the left and right low beam lamps and grounded; a first terminal connected to one end of the left and right high beam lamps; and a second terminal connected to the other end of the left high beam lamp A third terminal connected to the other end of the right high beam lamp, a fourth terminal connected to the other end of the left low beam lamp, and a fifth terminal connected to the other end of the right low beam lamp; A sixth terminal connected to the lamp terminal; and a switch for turning on and off a connection between the other ends of the left and right low beam lamps and the power supply as the power supply circuit. Comprising a said control means is for controlling on and off of said switch means (claim 2).

According to this structure, when the control means turns on the switch means incorporated in the electric junction box, power is supplied from the power supply to the left and right low beam lamps, so that the left and right low beam lamps are turned on. . On the other hand, lighting of the left and right high beam lamps is controlled by a circuit in the control unit connected to the unit terminal of the control unit to which the first terminal, the second terminal, and the third terminal can be connected.

Further, in the vehicle headlamp control device according to claim 2, the control unit includes, as the unit terminal, a second power supply terminal connectable to the power supply terminal of the electric connection box, and the first terminal. A second ground terminal, a seventh terminal connectable to the second terminal, an eighth terminal connectable to the third terminal, and a third ground terminal connectable to the ground terminal. A circuit included in the control unit, a semiconductor switching element for turning on and off a connection between the second power supply terminal and the seventh and eighth terminals in response to a control signal input to a control terminal; And a short circuit for connecting the third ground terminal. The control means determines whether or not a predetermined dimming lighting condition is satisfied. While turning on the stage and the control signal comprising a PWM signal of a preset duty ratio used to input to the control terminal of the semiconductor switching elements (claim 3).

According to this configuration, when the supply terminal of the electric connection box is connected to the unit terminal of the control unit, the power supply is connected to the second power supply terminal of the control unit, and the seventh terminal of the left high beam lamp is connected to the seventh terminal. The other end is connected, the other end of the right high beam lamp is connected to the eighth terminal,
One ends of the left and right high beam lamps are grounded in common with one end of the left and right low beam lamps via a first terminal, a second ground terminal, a short circuit, a third ground terminal, and a ground terminal. If it is determined in this state that the dimming lighting condition is satisfied, the switch means is turned on, and a control signal including a PWM signal having a preset duty ratio is input to the control terminal of the semiconductor switching element. When the semiconductor switching elements are turned on and off at the set duty ratio, power is supplied from the power supply to the left and right high beam lamps according to the set duty ratio, whereby the left and right high beam lamps are turned on with a light amount corresponding to the set duty ratio, thereby simplifying the operation. DRL is easily performed with a simple configuration.

In the present invention, the "duty ratio" is
(ON time of semiconductor switching element in one cycle /
(One cycle).

According to a third aspect of the present invention, there is provided the vehicle headlamp control device, further comprising a second control unit formed separately from the electric connection box and including a circuit for controlling the operation of the power supply circuit. The second control unit includes a plurality of unit terminals connected to predetermined circuit positions of a built-in circuit, and includes a predetermined terminal among the supply terminals of the electric connection box; A predetermined terminal among the unit terminals of the second control unit and one of the predetermined terminals among the unit terminals of the second control unit are configured to be selectively connectable to each other; The lamp terminal of the connection box is grounded via an operation switch for instructing lighting of the high beam lamp, and the second control unit is used as the unit terminal. A seventh terminal connectable to the second terminal of the electric connection box, 8 connectable to the third terminal
A terminal, a ninth terminal connectable to the fourth terminal, a tenth terminal connectable to the fifth terminal, an eleventh terminal connectable to the first terminal, and a connectable to the sixth terminal. Twelfth
The control unit includes a first short circuit connecting the seventh terminal to the ninth terminal, and a second short circuit connecting the eighth terminal to the tenth terminal. And a third short circuit connecting the eleventh terminal and the twelfth terminal. The control means is configured such that a supply terminal of the electric connection box is connected to a unit terminal of the second control unit. When the operation switch is turned on, the switch means is turned on (claim 4).

According to this configuration, when the supply terminal of the electric connection box is connected to the unit terminal of the second control unit,
One ends of the left and right high beam lamps are the first terminal, the eleventh terminal.
A terminal, a third short circuit, a twelfth terminal, a sixth terminal, and a lamp terminal are connected to the operation switch, and the other end of the left high beam lamp is connected to the second terminal, the seventh terminal, the first short circuit, the ninth terminal. The other end of the right low beam lamp is connected to the other end of the left low beam lamp via the terminal and the fourth terminal, and the other end of the right high beam lamp is connected to the other terminal via the third terminal, the eighth terminal, the second short circuit, the tenth terminal, and the fifth terminal. Connected to the other end of the right low beam lamp. When the operation switch is turned on in this state,
Since one end of each of the left and right high beam lamps is grounded, power is supplied from a power source to the left and right low beam lamps and the left and right high beam lamps by turning on the switch means while using the same electrical connection box. hand,
Both lamps will light up.

[0023]

FIG. 1 is a perspective view showing an appearance of an electric junction box 1 used in an embodiment of a headlamp control device for a vehicle according to the present invention. The electric connection box 1 has, for example, a rectangular parallelepiped shape, and includes a power supply terminal PV1, first to sixth terminals P6 to P6, and a ground terminal PE1 as supply terminals disposed at appropriate locations on the upper surface. Each supply terminal functions as a female connector. As shown in FIG. 1, the sixth terminal P6 is arranged in parallel with the first terminal P1, the fourth terminal P4 is arranged in parallel with the second terminal P2, The fifth terminal P5 is the third terminal P3
Are installed side by side. In addition, the electric connection box 1 includes a lamp terminal PL, a battery terminal PB, and a terminal P15 that are disposed at appropriate positions on the surface.

FIG. 2 is a diagram showing a DRL-compatible automotive headlamp control device. FIG. 2A is a perspective view showing a state in which a control unit 2 is mounted on an electric junction box 1 shown in FIG. 1, and FIG. 2) is a sectional view taken along line AA. FIG. 3 is a circuit diagram of the vehicle headlamp control device in the case of FIG.

As shown in FIG. 3, the vehicle headlamp control device includes left and right headlamps B1 and B2, an electric connection box 1, a control unit 2, an operation unit 3, a control unit 4, a battery (Power supply) 5.

The left headlamp B1 has a high beam lamp L11 and a low beam lamp L12 inside, and the right headlamp B2 has a high beam lamp L21 and a low beam lamp L22 inside similarly to the left, and is electrically connected. The box 1 further includes a relay RL1.

The power supply terminal PV1 of the electric connection box 1 is short-circuited to the battery terminal PB, and the ground terminal PE1 is connected to one end of the left and right low beam lamps L12 and L22 and is grounded to ground.

The first terminal P1 is connected to one end of each of the left and right high beam lamps L11 and L21.
2 is connected to the other end of the left high beam lamp L11, the third terminal P3 is connected to the other end of the right high beam lamp L21, and the fourth terminal P4 is connected to the other end of the left low beam lamp L12. , The fifth terminal P5 is connected to the other end of the right low beam lamp L22, and the sixth terminal P5
6 is short-circuited to the lamp terminal PL. The battery terminal PB is connected to the positive terminal of the battery 5, and the terminal PB
Reference numeral 15 is connected to an output terminal of the control unit 4.

One of the relay contacts of the relay RL1 is connected to the battery terminal PB, and the other is the left low beam lamp L
12 and the other end of the right low beam lamp L22, one end of the coil of the relay RL1 is connected to the battery terminal PB, and the other end is connected to the terminal P15.

The control unit 2 is for making the vehicle headlamp control device compatible with DRL.
As shown in FIG. 3, a DRL control unit 21 is provided, and a power supply terminal PV2, a seventh terminal P
7, an eighth terminal P8 and ground terminals PE2 and PE3.

When the control unit 2 is mounted on the electric connection box 1 as shown in FIG.
As shown in FIG. 2B, it functions as a male connector fitted to each supply terminal of the electric connection box 1. As shown in FIG. 3, the power terminal PV2 is connected to the power terminal PV1, and the seventh terminal is connected to the power terminal PV1. P7 is a second terminal P2, and an eighth terminal P8 is a third terminal P3.
The ground terminal PE2 is connected to the first terminal P1,
E3 is configured to fit into the ground terminal PE1.

The DRL control unit 21 is connected to a ground terminal PE21.
And a semiconductor switching element 22;
E21 is connected to the ground terminals PE2 and PE3. The semiconductor switching element 22 includes a control terminal P21 and switch terminals P22 and P23.
When a predetermined control signal is input to the switch terminal P2
The control terminal P21 is connected to the output terminal of the control unit 4, the switch terminal P22 is connected to the power supply terminal PV2, and the switch terminal P23 is connected to the seventh terminal P7 and the eighth terminal P8. Have been.

The semiconductor switching element 22 is an element capable of high-speed switching with a switching frequency of about 100 Hz or more, and may use a field effect transistor such as a MOSFET or a bipolar transistor such as an insulated gate bipolar transistor (IGBT).

It is to be noted that, since the voltage can be driven, the switching control can be easily performed and the on-resistance is low.
Is most preferred. M as the semiconductor switching element 22
When an OSFET is used, the control terminal P21 is a gate, the switch terminal P22 is a drain, and the switch terminal P2
3 is the source.

With this configuration, when the control unit 2 is mounted on the electric junction box 1, the positive terminal of the battery 5 is connected to the switch terminal P22 of the semiconductor switching element 22, and the other ends of the left and right high beam lamps L11 and L21 are connected. Connected to the switch terminal P23 of the semiconductor switching element 22. Also, the left and right high beam lamps L11, L2
1 has left and right low beam lamps L12, L22.
Of the DRL controller 21 and the ground terminal PE21 of the DRL control unit 21, and are commonly grounded to the ground.

The operation unit 3 is operated by the driver, and includes an ignition switch 31 and a parking brake 32.
And a lamp control switch 33, and an operation signal is input to the control unit 4.
The lamp control switch 33 is for instructing lighting of a lamp such as a low beam lamp, a high beam lamp, and a tail lamp.

The control section 4 is composed of a microcomputer or the like. When the headlamp switch of the lamp control switch 33 is operated, the control section 4 operates according to the operation procedure described later.
High beam lamp L in left and right headlamps B1, B2
11, L21 and the low beam lamps L12, L22.

When the ignition switch 31 is turned on and the parking brake 32 is released, the control unit 4 does not instruct the lamp control switch 33 to turn on any of the high beam lamp and the low beam lamp. At that time, it is determined that the dimming lighting condition is satisfied.

Then, by outputting a low level signal to the terminal P15, an exciting current is supplied to the coil of the relay RL1, and a switching frequency of about 100 Hz or more at a preset duty ratio (for example, 50%). A control signal including a (Pulse Width Modulation) signal is output to the control terminal P21 of the semiconductor switching element 22.

Next, the operation of the control device shown in FIG. 3 will be described with reference to FIG. FIGS. 4A and 4B are timing charts showing the state of each part, and FIG. 4A is a diagram for explaining the DRL operation, and FIG.
FIG. 3 is a diagram illustrating lighting of a high beam lamp, and FIG. 3C is a diagram illustrating lighting of a low beam lamp.

As shown in FIG. 4 (a), the ignition switch 31 is turned on by the driver, when the parking brake 32 is released at the time point t _1, when the lamp control switch 33 is not operated, The controller 4 determines that the DRL operating conditions are satisfied.

Then, the output signal level to the terminal P15 is lowered to the low level by the control unit 4, and the control unit 4 sends the control signal to the control terminal P2 of the semiconductor switching element 22.
1, a PWM signal having a duty ratio of 50% is input. Thus, the left and right low beam lamps L12 and L22 are turned on, and the left and right high beam lamps L11 and L2 are turned on.
The light amount of 1 is reduced and turned on, and the DRL is activated.

Once the DRL is activated, the control unit 4 holds the DRL without releasing it even if the parking brake 32 is turned on halfway.
The lighting of the left and right high beam lamps L11 and L21 with the reduced light amount is continued.

[0044] Then, during operation of DRL in this state, as shown in FIG. 4 (b), the lamp control switch 33 by the driver at t ₂ time is operated and the lighting of the high beam lamp is instructed, the control A high level signal is output from the unit 4 to the control terminal P21 of the semiconductor switching element 22. As a result, the DRL is released, and the high beam lamps L11 and L21 are turned on with a normal light amount.

On the other hand, during the operation of the DRL, as shown in FIG. 4C, when the lamp control switch 33 is operated by the driver at time t ₃ to instruct the low-beam lamp to be turned on, the control unit 4 outputs a signal. Semiconductor switching element 2
A low level signal is output to the control terminal P21 of the second. As a result, the DRL is released and the high beam lamp L1 is released.
1 and L12 are turned off, and the low beam lamps L21 and L22 are turned off.
Only lights up.

FIG. 5 is a diagram showing a standard, that is, a headlamp control apparatus for a vehicle which does not support DRL. FIG. 5 (a) is a perspective view showing a state where the control unit 20 is mounted on the electric junction box 1 of FIG. () Is a sectional view taken along line BB of (a). FIG. 6 is a circuit diagram of the vehicle headlamp control device in the case of FIG. 5, and the same components as those in FIG. 3 are denoted by the same reference numerals.

The control unit 20 is for making this vehicle headlamp control device a standard type, that is, a type not compatible with DRL. As shown in FIG. 6, as a unit terminal, a seventh terminal P7 and an eighth terminal are used. P8, ninth terminal P
9, a tenth terminal P10, an eleventh terminal P11, and a twelfth terminal P12.

The control unit 20 is connected to the seventh terminal P7
Short circuit 25 connecting the ninth terminal P9 and the ninth terminal P9,
A short circuit 26 connecting the eighth terminal to the tenth terminal P10 and a short circuit 27 connecting the eleventh terminal P11 and the twelfth terminal P12 are provided.

When the control unit 20 is mounted on the electric connection box 1 as shown in FIG. 5A, the respective unit terminals are connected to the respective supply terminals of the electric connection box 1 as shown in FIG. 5B. It functions as a mating male connector.
, The seventh terminal P7 is the second terminal P2, the eighth terminal P8 is the third terminal P3, and the ninth terminal P9 is the fourth terminal P4.
The tenth terminal P10 is connected to the fifth terminal P5 and the eleventh terminal P
11 is a first terminal P1, a twelfth terminal P12 is a sixth terminal P
6 are configured to fit each other.

The lamp control switch 34 instructs to turn on a lamp such as a head lamp switch including a high beam lamp switch 35 for instructing lighting of a high beam lamp and a low beam lamp switch for instructing lighting of a low beam lamp, and a tail lamp. A switch and the like are omitted.

The lamp terminal PL of the electric connection box 1 is
It is grounded via a high beam lamp switch 35.

With this configuration, when the control unit 20 is mounted on the electric junction box 1, the left and right high beam lamps L1
1, one end of L21 is connected to the high beam lamp switch 35 via the short circuit 27, and the other end of the left high beam lamp L11 is connected to the relay contact of the relay RL1 via the short circuit 25, and the right high beam The other end of the lamp L21 is connected to the relay RL1 via the short circuit 26.
Connected to the relay contact.

The control section 40 is composed of a microcomputer or the like. When the headlamp switch of the lamp control switch 34 is operated, the left and right headlamps B are controlled.
1 to control the turning on and off of the high beam lamps L11 and L21 and the low beam lamps L12 and L22 in B2.

Next, the operation of the circuit of FIG. 6 will be described. When the driver turns on the low beam lamp switch of the lamp control switch 34, the terminal P1
5, a low level signal is output, and an exciting current is supplied to the coil of the relay RL1. As a result, power is supplied from the battery 5 to the left and right low beam lamps L12 and L22, and the lamps are turned on.

When the high beam lamp switch 35 of the lamp control switch 34 is turned on, a low level signal is output to the terminal P15, and an exciting current is supplied to the coil of the relay RL1. By turning on the high beam lamp switch 35, the left and right high beam lamps L1
1 and L21 are grounded to the ground via the short circuit 27 and the high beam lamp switch 35, so that power is supplied from the battery 5 to the left and right high beam lamps L11 and L21 and the left and right low beam lamps L12 and L22, respectively. Light.

As described above, according to the present embodiment, the electrical junction box 1 has exactly the same configuration between the DRL-compatible type and the non-DRL-compatible type, whereby the electrical junction box 1 is connected to the headlamps B1 and B2. The wiring connection of the wire harness can be shared, the number of types of the electric connection box 1 and the wire harness can be reduced, and the mass productivity can be improved.

The control section 4 applies a PWM signal having a predetermined duty ratio to the control terminal P21 of the semiconductor switching element 22.
Since a signal is input, the amount of light of the high beam lamps L11 and L21 can be reduced with a simple wiring configuration, whereby the DRL can be easily operated.

When an abnormality occurs in the DRL control unit 21, only the control unit 2 needs to be replaced.
Maintenance workability can be improved.

Further, in the control section 4, it is possible to easily change the dimming lighting establishment condition, the release condition, and the change of the light amount by changing the set duty ratio. It can be easily handled.

The present invention is not limited to the above embodiment, but can adopt the following modifications (1) to (3). (1) In the above embodiment, when the DRL is activated, the control unit 4
The duty ratio of the PWM signal output to the control terminal P21 of the semiconductor switching element 22 is not limited to 50%,
What is necessary is just to set according to the required light quantity defined by law.

(2) The DRL control unit 21 controls each lamp L1
In addition to detecting an abnormality such as disconnection of the wire harness to L1, L12, L21, or L22 or a short circuit between the wire harness and the vehicle body or the like, a diagnosis signal is output to the control unit 4 as shown by a dashed line in FIG. May be provided. The level of the diagnosis signal may be, for example, a high level in a normal state and a low level in an abnormal state.

Further, a buzzer or L for notifying the driver of an abnormality is provided.
The control unit 4 is provided with a notification unit such as an ED, and operates the notification unit when a diagnosis signal indicating an abnormality is input. According to this embodiment, the occurrence of the abnormality can be immediately notified to the driver.

The DRL control unit 21 has an IPS (Intelligent Power Switch) having a self-protection function.
May be used.

(3) The control unit 2 may be connected to the electric connection box 1 via the connector 6 with a lead wire as shown in FIG. Good.

[0065]

As described above, according to the present invention,
A predetermined terminal among supply terminals connected to a predetermined circuit position of a power supply circuit built in the electric connection box and a predetermined circuit position of a circuit built in the control unit. Power supply circuit with the same circuit configuration, the power supply circuit can be connected to a predetermined terminal. The control of the operation of the supply circuit can be changed, so that the configuration of the electric junction box and the wiring harness can be shared regardless of the control of the operation of the power supply circuit.

The electric connection box is provided with a lamp terminal, as a power supply circuit, switch means for turning on and off the connection between the other ends of the left and right low beam lamps and the power supply, and is connected to the power supply as a supply terminal. A power terminal, a ground terminal connected to one end of the left and right low beam lamps and grounded, a first terminal connected to one end of the left and right high beam lamps, and a second terminal connected to the other end of the left high beam lamp. A second terminal, a third terminal connected to the other end of the right high beam lamp, a fourth terminal connected to the other end of the left low beam lamp, and a fourth terminal connected to the other end of the right low beam lamp. 5 terminals and a sixth terminal connected to the lamp terminal, and further comprising a control unit for controlling on / off of the switch unit. When switch means is turned on,
Power can be supplied from the power supply to the left and right low beam lamps, and thereby the left and right low beam lamps can be turned on, while the first terminal, the second terminal, and the third terminal are connected to the unit terminals of the connectable control unit. The lighting of the left and right high beam lamps can be controlled by a circuit in the connected control unit.

When the supply terminal of the electric connection box is connected to the unit terminal of the control unit, a power supply is connected to the second power supply terminal of the control unit, and the other end of the left high beam lamp is connected to the seventh terminal. Then, the other end of the right high beam lamp is connected to the eighth terminal, and one end of the left and right high beam lamps is connected via the first terminal, the second ground terminal, the short circuit, the third ground terminal, and the ground terminal. In this state, when it is determined that the dimming lighting condition is satisfied, the switch means is turned on, and the predetermined duty ratio is set to a predetermined value. By inputting a control signal consisting of a PWM signal to the control terminal of the semiconductor switching element and turning the semiconductor switching element on and off at a set duty ratio, the left and right high And the power corresponding to the set duty ratio from the power supplied to Muranpu, can light the left and right high beam lamp at a light quantity corresponding to the set duty ratio, whereby it is possible to easily DRL with a simple structure.

When the supply terminal of the electric connection box is connected to the unit terminal of the second control unit, one end of the left and right high beam lamps is connected to the first terminal, the eleventh terminal, the third short circuit, the twelfth terminal. The other end of the left high beam lamp is connected to the operation switch via the second terminal, the seventh terminal, the first short circuit, the ninth terminal and the fourth terminal. And the other end of the right high beam lamp is connected to the third terminal, the eighth terminal.
When the operation switch is turned on in this state, one of the left and right high beam lamps is connected to the other end of the right low beam lamp via the terminal, the second short circuit, the tenth terminal, and the fifth terminal. Since the end is grounded, by turning on the switch means, it is possible to supply power from the power source to the left and right low beam lamps and the left and right high beam lamps while using the same electrical connection box,
Both lamps can be turned on.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external appearance of an electric junction box used in one embodiment of a vehicle headlamp control device according to the present invention.

FIGS. 2A and 2B are views showing a state in which a control unit is mounted on the electric junction box of FIG. 1, wherein FIG. 2A is a perspective view and FIG.
FIG. 4 is a cross-sectional view taken along a line A.

FIG. 3 is a circuit diagram of the vehicle headlamp control device in the case of FIG. 2;

FIG. 4 is a timing chart showing the state of each unit.

FIGS. 5A and 5B are diagrams showing a state in which a control unit is mounted on the electric junction box of FIG. 1, wherein FIG. 5A is a perspective view and FIG.
FIG. 4 is a cross-sectional view taken along line B.

FIG. 6 is a circuit diagram of the vehicle headlamp control device in the case of FIG. 5;

FIG. 7 is a perspective view showing a different form of the control unit.

FIG. 8 shows a conventional DRL-compatible headlamp control circuit.

FIG. 9 shows a conventional standard (non-DRL compliant) headlamp control circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric connection box 2, 20 Control unit 21 DRL control part 22 Semiconductor switching element 25-27 Short circuit 3 Operation part 31 Ignition switch 32 Parking brake 33, 34 Lamp control switch 35 High beam lamp switch 4, 40 Control part (control means) 5 Battery B1, B2 Headlamp L11, L12 High beam lamp L21, L22 Low beam lamp RL1 Relay

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Miya ▲ saki ▼ Junnoyuki 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi Harness Research Institute, Inc. (72) Inventor Hiroshi Sudo Minami-Nagoya, Aichi 1-7-10 Kikuzumi-ku, Harness Research Institute

Claims (4)

[Claims] 1. An automobile headlamp control device for controlling power supply from a power supply to left and right headlamps having a high beam lamp and a low beam lamp, respectively, being disposed between the power supply and the left and right headlamps. An electrical connection box containing a power supply circuit for power supply, and a control unit formed separately from the electrical connection box and containing a circuit for controlling the operation of the power supply circuit, The electric connection box includes a plurality of supply terminals connected to predetermined circuit positions of the built-in power supply circuit, and the control unit includes a plurality of supply terminals connected to predetermined circuit positions of the built-in circuit. And a predetermined terminal among the supply terminals of the electrical connection box and a predetermined terminal among the unit terminals of the control unit. A headlamp control device for a vehicle, wherein the terminal is configured to be connectable to a terminal. 2. The vehicle headlamp control device according to claim 1, further comprising control means, wherein the electric junction box comprises:
A power supply terminal connected to the power supply as the supply terminal, a ground terminal connected to one end of the left and right low beam lamps and grounded, and connected to one end of the left and right high beam lamps as the supply terminal. First terminal, a second terminal connected to the other end of the left high beam lamp, a third terminal connected to the other end of the right high beam lamp, and a second terminal connected to the other end of the left low beam lamp. A fourth terminal; a fifth terminal connected to the other end of the right low-beam lamp; and a sixth terminal connected to the lamp terminal. As the power supply circuit, the other ends of the left and right low-beam lamps are connected to each other. A headlamp for an automobile, comprising: switch means for turning on / off a connection to a power supply, wherein the control means controls on / off of the switch means. Loop control system. 3. The headlamp control device for a vehicle according to claim 2, wherein the control unit includes, as the unit terminal, a second power supply terminal connectable to the power supply terminal of the electric connection box, and the first terminal. A second ground terminal, a seventh terminal connectable to the second terminal, an eighth terminal connectable to the third terminal, and a third ground terminal connectable to the ground terminal. A circuit included in the control unit, a semiconductor switching element for turning on and off a connection between the second power supply terminal and the seventh and eighth terminals in response to a control signal input to a control terminal; And a short circuit for connecting the third ground terminal. The control means determines whether or not a predetermined dimming lighting condition is satisfied. Means A headlamp control device for an automobile, which is turned on and inputs a control signal consisting of a PWM signal having a preset duty ratio to a control terminal of the semiconductor switching element. 4. The vehicle headlamp control device according to claim 3, further comprising a second control unit formed separately from the electric connection box and including a circuit for controlling the operation of the power supply circuit. The second control unit includes a plurality of unit terminals connected to predetermined circuit positions of a built-in circuit, and includes a predetermined terminal among the supply terminals of the electric connection box; A predetermined terminal among the unit terminals of the second control unit and one of the predetermined terminals among the unit terminals of the second control unit are configured to be selectively connectable to each other; The lamp terminal of the connection box is grounded through an operation switch for instructing lighting of the high beam lamp, and the second control unit is configured as the unit terminal as the unit terminal. A seventh terminal connectable to the second terminal of the electrical junction box, an eighth terminal connectable to the third terminal, a ninth terminal connectable to the fourth terminal, and connectable to the fifth terminal. A tenth terminal, an eleventh terminal connectable to the first terminal, and a twelfth terminal connectable to the sixth terminal, wherein the circuit incorporated in the control unit includes the seventh terminal and the A first short circuit connecting the ninth terminal, a second short circuit connecting the eighth terminal and the tenth terminal, and a third short circuit connecting the eleventh terminal and the twelfth terminal.
A short circuit, wherein the control means turns on the switch means when the operation switch is turned on when the supply terminal of the electric connection box is connected to the unit terminal of the second control unit. An automobile headlamp control device characterized in that: