JPH0771906B2 - Vehicle headlamp lighting control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a vehicle headlamp lighting control device for forcibly lighting a dimmed headlamp by detecting the presence or absence of an ignition switch and engine rotation. .

B. Conventional technology Some foreign countries require that headlamps be dimmed and turned on even during daytime driving. This is called DAY TIME RUNNING LIGHT (hereinafter DRL
It is generally practiced that even if the dimmer lamp switch is off, the lamp is forcibly turned on in a dimmer state when the vehicle runs.

FIG. 4 shows a conventional lighting circuit in consideration of such DRL,
The figure shows a case where the headlamp is applied to one having a pair of left and right filaments.

In the figure, L _R and L _L are left and right headlamp filaments, RL ₇ and RL ₈ are relays having relay coils A ₇ and A ₈ and relay switches SW ₇ and SW ₈ , respectively, and SW _L is a headlamp switch. . CC is a control circuit and is a battery power source (hereinafter,
B power source) BT, ignition switch SW _Ig , starter switch SW _ST , head lamp switch SW _L , and ON signal are input, and engine speed sensor SEN
The engine rotation presence signal from is input, and the control circuit CC determines the DRL state by these signals. At that time, the control circuit CC outputs a drive signal to the relay coils A ₇ and A ₈ .

Both ends of the left headlamp filament L _L are connected to the movable contacts a and d of the relay switches SW ₇ and SW ₈ , respectively, and one end of the right headlamp filament L _R is connected to the relay switch SW.
_It is connected to the fixed contact b of ₇ and the fixed contact f of the relay switch SW ₈ , and the other end is grounded. The fixed contact c of the switch SW ₇ is connected to the B power source BT, and the fixed contact e of the relay switch SW ₈ is grounded. When the relay coils A ₇ and A ₈ are not excited, the relay switches SW ₇ and SW ₈ are connected to the contacts a and b and the contacts d and e, respectively, as shown in the figure.

In such a configuration, when the control circuit CC does not determine the DRL state and the headlamp switch SW _L is turned on in the state where the drive signal is not output to the relay coils A ₇ and A ₈ , the relays RL ₇ and RL ₈ are turned on. Is in the position shown in the figure, so fixed contact b of B power supply BT → headlamp switch SW _L → relay switch SW ₇
→ Movable contact a → Left headlamp filament L _L → Relay switch SW ₈ movable contact d → Fixed contact e → Grounding route and B power supply BT → Headlamp switch SW _M → Right headlamp filament L _R → Ground Currents flow through the paths. That is, the filament for the left and right headlamps
L _L and L _R are connected in parallel to the B power source BT, and a current flows through them to turn on with normal brightness.

Next, when the ignition switch SW _Ig is turned on, the headlamp switch SW _L is turned off, and the engine rotation presence signal is input to the control circuit CC, the control circuit CC determines that the vehicle is in the DRL state. As a result, a drive signal is output from the control circuit CC to excite the relay coils A ₇ and A ₈ , and the contacts of the relay switches SW ₇ and SW ₈ are switched. Therefore,
B power supply BT → fixed contact c of relay switch SW ₇ → movable contact a → left headlamp filament L _L → relay switch SW ₈ movable contact d → fixed contact f → right headlamp filament L _R → ground path Power flows. That is, the left and right headlamp filaments L _L , L _R are B power source B
It is connected in series with T and current flows. Therefore, in the DRL state, each lamp illuminates with half the brightness of normal illumination.

At this time, when the headlamp switch SW _L is turned on, the drive signal output from the control circuit CC to the coils A ₇ and A ₈ disappears, so the relay switches SW ₇ and SW ₈ are fixed contacts.
The filaments L _L and L _R are switched to the b and e sides, respectively, are connected in parallel to the B power source BT, and are lit with normal brightness.

C. Problem to be Solved by the Invention In such a conventional configuration, since the left and right headlamp filaments L _L and L _R are connected in series to the B power source BT in the DRL state, when one of the filaments is disconnected. The B power source BT is not supplied to the other filament, and both lamps are turned off.

A technical problem of the present invention is to make it possible to maintain the lighting state of another filament even if one filament is broken in the DRL state.

D. Means for Solving the Problems The configuration of the present invention will be described with reference to FIG. 1 showing an embodiment. The headlamp lighting control device according to the present invention is provided with a main lamp switch SW _M and a dimmer lamp switch SW.
_D , a pair of main lamp filaments L _ML , L _MR and dimmer lamp filaments L _DL , L _DR provided on the left and right of the vehicle, respectively, and an ignition switch SW _Ig is turned on,
Judgment means for outputting a switching signal when it is judged that both the main and dimmer lamp switches SW _M , SW _D are off
CC and lighting circuit switching means RL _{1 to} RL ₅ that form a first lighting circuit when the switching signal is not output and a second lighting circuit when the switching signal is output. When the first lighting circuit is formed, the left and right main lamp filaments L _ML and L _MR and the dimmer lamp filaments L _DL and L _DR are connected in parallel to the battery power source BT, and the dimmer lamp switch SW _D is turned on. The Dima lamp filament L _DL , L _DR is energized, and the main lamp filament SW L _M , L is turned on by turning on the main lamp switch SW _M.
MR is energized. Further, when the second lighting circuit is formed, the pair of left and right main lamp filaments and the dimmer lamp filaments L _ML and L _DL and L _MR and L _DR are connected in parallel with each other and the left and right parallel connection circuits are connected in series. Therefore, even if the dimmer lamp switch SW _D and the main lamp switch SW _M are off, each pair of the dimmer lamp filament and the main lamp filament is energized.

E. Action When the second lighting circuit is formed, the circuit configuration is as shown in FIG. 2, so that even if one of the filaments for the dimmer lamp or the main headlamp is broken, the remaining three lights.

It should be noted that, in the above-mentioned items D and E for explaining the configuration of the present invention, the drawings of the embodiments are used to make the present invention easy to understand, but the present invention is not limited to the embodiments.

F. Example-First Example-Hereinafter, an example of the present invention will be described with reference to FIG. In FIG. 1, the same elements as those in FIG.

L _MR , L _DR and L _ML , L _DL are the right and left main headlamp filaments and dimmer lamp filaments installed on the vehicle, respectively, and RL _{1 to} RL ₅ are relays, SW _M and SW _D
Is the filament L for the main and dima lamps respectively
Main headlamp switch and dimmer lamp switch controlled by B power source BT to control lighting of _DR and L _DL , CC
Is a control circuit, and D ₁ and D ₂ are diodes. The relay RL ₁ has a relay coil A ₁ and relay switches SW ₁₁ and SW ₁₂ ,
Each relay RL ₂ ~RL ₅ has a relay coil A ₂ to A ₅ and Riresuichi SW ₂ to SW _5. A B power source BT is connected to the control circuit CC, an ON signal from the ignition switch SW _Ig and the starter switch SW _ST, and a rotation present signal from the engine rotation sensor SEN are input, and its output (OUT) is output from each relay RL ₁ ~ Connected to relay coils A _{1 to} A ₅ of RL ₅ .

One end of each of the right main headlamp filament L _MR and the dimmer lamp filament L _DR is grounded, and the other end of the right main headlamp filament L _MR is a relay R.
It is connected to the movable contact a of the relay switch SW ₁₂ of the relay RL ₁ and the other end of the left main headlamp filament L _ML via the relay switch SW ₂ of L ₂ . The other end of the right dimmer lamp filament L _DR is connected to the dimmer lamp switch SW _D. Further, the filament L _MR for the right lamp, L other ends diode D ₁ of the _DR, D ₂ of the cathode - via the switch SW ₃ of the anode and the relay RL ₃ the fixed contact f of the relay switch SW ₅ of the relay RL ₅ Connected. Further, the fixed contact b of the relay switch SW ₁₂ is connected to the main headlamp switch SW _M.

Filament for left main and dimmer lamp L _ML , L _DL
Each one end of which is both connected to the movable contact d of relay switch SW ₅ of the relay RL _5, the other end relay switch SW ₄ of the relay RL ₄
Connected to both ends of. Also filament for dimmer lamp
The other end of L _D is connected to the dimmer lamp switch SW _D via the relay switch SW ₁₁ of the relay RL ₁ . Relay switch S
The fixed contact e of W ₅ is grounded, and the fixed contact c of the relay switch SW ₁₂ is connected to the B power source BT. The relay switches SW ₁₁ , SW ₁₂ , SW _{2 to} SW ₅ of the relays RL _{1 to} RL ₅ are output from the control circuit CC (OU
When the drive signal is not output to (T), the first lighting circuit is formed at the position shown in the figure, and when the drive signal is sent, the relay coils A _{1 to} A ₅ are excited and switched to the other position. A second lighting circuit is formed.

Next, the operation of the lighting control circuit having such a configuration will be described.

When the DRL state is not judged by the control circuit CC, the drive signal is not sent to the output (OUT) and the relays RL _{1 to} RL
_{Since the five} relay coils A _{1 to} A ₅ are not excited, the relay switches SW ₁₁ , SW ₁₂ , SW _{2 to} SW ₅ are set to the positions shown in the figure. When the main headlamp switch SW _M is turned on in this first lighting circuit formation state, B power source BT → main headlamp switch SW _M → fixed contact b of relay switch SW ₁₂ → movable contact a → relay switch SW ₂ → right side Main headlamp filament L _MR → grounding path,
B power supply BT → main headlamp switch SW _M → fixed contact b of relay switch SW ₁₂ → movable contact a → left main headlamp filament L _ML → movable contact d of relay switch SW ₅ → fixed contact e → ground path Electric current flows through the main headlamps on the left and right, and the main headlamps turn on at normal brightness.

When the dimmer lamp switch SW _D turns on, B power supply BT
→ Dima lamp switch SW _D → Right dima lamp filament L _DR → Grounding route and B power supply BT → Dima lamp switch SW _D → Relay switch SW ₁₁ → Left Dima lamp filament L _DL → Moving contact d of relay switch SW ₅ → A current flows through the fixed contact e → ground path. That is, the left and right dimmer lamp filaments L _DL and L _DR are connected in parallel to the B power source BT, and the power source is turned on, as in the case of turning on the main headlamp switch SW _M.

Next, when the ON signal of the ignition switch SW _Ig , the rotation rotation signal from the engine rotation sensor SEN, and the OFF signals of the dimmer lamp switch SW _D and the main headlamp switch SW _M are input to the control circuit CC, control is performed. The circuit CC determines that the vehicle is in the DRL state and sends a drive signal to the output (OUT).

This relay RL ₁ ~RL ₅ of the relay coil A ₁ to A ₅ is energized the relay switch _{SW 11, SW 12, SW 2} ~SW 5 switched to the opposite position and shown respectively, the second lighting circuit Is formed. As a result, when the relay switch SW ₄ is closed, the filaments L _ML and L _DL of the left main headlamp and the dimmer lamp are connected in parallel, and when the relay switch SW ₃ is closed, the main headlamp and the dimmer lamp on the right side are connected. The filaments L _MR and L _DR are also connected in parallel.

As a result, the B power source BT → the fixed contact c of the relay switch SW ₁₂ → the movable contact a → the parallel circuit of the left main head lamp and filaments for the dimmer lamp L _ML , L _DL → the movable contact d of the relay switch SW ₅ → the fixed contact f → Relay switch SW ₃
→ Diodes D ₁ and D ₂ → right main headlamp and dimmer lamp filaments L _MR and L _DR → Current flows in the path of grounding. That is, the connection between each lamp and the B power source BT is as shown in FIG.
A parallel circuit of L _ML and Tima lamp filament L _DL ,
The parallel circuit of the right main headlamp filament L _MR and the dimmer lamp filament L _DR is connected in series to the B power source BT. With such a connection, the headlamp lights up in the DRL as darker than in the normal lighting as in the conventional case. Therefore, filaments for main headlamps and dimmer lamps L _ML , L _DL , L _MR , L _DR
Even if any one of them is disconnected, the other lamps can be energized from the B power source BT to maintain the lighting state.

- Second Embodiment - Figure 3 shows another embodiment of the present invention, In FIG, RL ₁₁
~ RL ₁₆ is a relay, and relay coils A _{11 to} A ₁₆ respectively
Have. The relay RL ₁₁ has relay switches SW ₁₁₁ and SW ₁₁₂ , and the relays RL _{12 to} RL ₁₆ are respectively relay switches SW _20.
~ Has SW ₆₀ . D ₁₁ to D ₁₄ are diodes.

One end of each of the right main headlamp and filaments for dimming lamps L _MR , L _DR are both relay switches of relay RL ₃ .
The other end of the main headlamp filament L _MR is connected to the contact g of SW ₃₀ , and the fixed contact f of the relay switch SW ₂₀ of the relay RL ₁₂ and the movable contact of the relay switch SW ₁₁₂ via the cathode-anode of the diode D _13. Further, it is connected to the fixed contact k of the relay switch SW ₄₀ via the anode-cathode of the diode D ₁₃ and the diode D ₁₄ . The other end of the right-side dimmer lamp filament L _DR is connected to the movable contact d of the relay switch SW ₂₀ .

One end of each of the left main headlamp filament and the Dima lamp filament L _ML , L _DL is connected to the movable contact m of the relay switch SW ₆₀ of the relay RL ₁₆ , and the other end of the main headlamp filament L _ML is connected to the relay switch SW ₄₀ . It is connected to the movable contact j. Also, filament for dima lamp L
The other end of _DL is connected to the dimmer lamp switch SW _D via the fixed contact 1 of the relay switch SW ₄₀ , the cathode-anode of the diode D ₁₂ , and the relay switch SW ₁₁₁ of the relay RL ₁₁ , and at the same time, the relay switch of the relay RL ₁₅ . Grounded via SW ₅₀ . The fixed contact e of the relay RL ₁₂ is connected to the cathode anode of the diode D ₁₁ and the dimmer lamp switch SW _D via the relay switch SW ₁₁₁ . Relay switch SW
The fixed contacts b and c of ₁₁₂ are connected to the main headlamp switch SW _M and the B power source BT, respectively. Also relays RL ₁₃ and RL ₁₆
The fixed contacts i and o of the relay switches SW ₃₀ and SW ₆₀ are connected to each other and h and n are grounded.

The operation of the second embodiment having such a configuration will be described.

Because if the control circuit CC as in the first drawing is not determined DRL state at its output (OUT) not sent drive signal, the relay coil A ₁₁ to A ₁₆ of the relay RL ₁₁ ~RL ₁₆ is not energized Therefore, the relay switches SW _{20 to} SW ₆₀ , SW ₁₁₁ , and SW ₁₁₂ form a first lighting circuit which is set at the illustrated position.

In this state, when the main headlamp switch SW _M is turned on, B power supply BT → main headlamp switch SW
_M → Fixed contact b of relay switch SW ₁₁₂ → Moving contact a → Diode D ₁₃ → Right side main headlamp filament L
_MR → relay switch SW ₃₀ movable contact g → fixed contact h → ground path and B power supply BT → main headlamp switch SW
_M → Fixed contact b of relay switch SW ₁₁₂ → Moving contact a → Diode D ₁₄ → Fixed contact k of relay switch SW ₄₀ → Moving contact j → Filament for left main headlamp L _ML →
Current flows through the path of the movable contact m of the relay switch SW ₆₀ → the fixed contact n → the ground. That is, the left and right main headlamp filaments L _ML and L _MR are connected in parallel to the B power source BT, and each main headlamp filament
A current flows through L _ML and L _MR , and it lights up at normal brightness.

When the dimmer lamp switch SW _D turns on, B power supply BT
→ Dimmer lamp switch SW _D → Relay switch SW ₁₁₁ → Diode D ₁₁ → Fixed contact e of relay switch SW ₂₀ → Moving contact d → Right side dimmer lamp filament L _DR → Moving contact g of relay switch SW ₃₀ → Fixed contact h → Grounding Path of
B Power supply BT → Dima lamp switch SW _D → Relay switch S
W ₁₁₁ → Diode D ₁₂ → Filament for left dimmer lamp L _DL → Moving contact m of relay switch SW ₆₀ → Fixed contact n
→ Each power source flows through the grounding path. That is, as in the case of turning on the main headlamp switch SW _M , the left and right dimmer lamp filaments L _DL and L _DR are connected in parallel to the B power source BT, and a current flows and lights.

Next, the control circuit CC is determined to be a DRL state, output the drive signal is sent to the (OUT) is energized the relay coil A ₁₁ to A ₁₆ of the relay RL ₁₁ ~RL ₁₆ is a relay switch SW ₂₀
SW ₆₀ , SW ₁₁₁ , and SW ₁₁₂ are switched to positions opposite to those shown in the figure to form a second lighting circuit. As a result, the circuit shown in FIG. 2 is formed. As a result, as in the case of FIG. 1, the main headlamp and the dimmer lamp filaments L _ML , L _DL , L _MR , L are lit darker than the normal lighting. _DR
Even if one of the filaments is broken, the other filaments are energized from the B power source BT, so that the lighting state can be maintained.

In the above DRL state, main headlamp switch SW _M
Alternatively, when the dimmer lamp switch SW _D turns on, the drive signal of the output (OUT) of the control circuit CC disappears, each relay switches to the state shown in FIG. 1 or 3, and the left and right main headlamp filaments L _MR , L _ML lights up.

G. Effect of the Invention According to the present invention as described above, in the DRL state, even if one of the main head lamp filament and the dimmer lamp filament is disconnected, the other lamps are intermittently maintained in the lighting state. It is possible to improve safety and reliability.

[Brief description of drawings]

1 and 3 are circuit diagrams showing a second embodiment of a lighting circuit according to the present invention, and FIG. 2 is a DR in FIG. 1 and FIG.
FIG. 4 is a diagram showing the connection relationship of the lamps in the L state, and FIG. 4 is a diagram showing a conventional example. L _MR : Filament for the right main headlamp L _ML : Filament for the left main headlamp L _DR : Filament for the right dimmer lamp L _DL : Filament for the left dimmer lamp CC: Control circuit, BT: Battery power supply RL ₁ ~ RL ₆ , RL ₁₁ ~ RL ₁₆ : Relay SW _M : Main headlamp switch SW _D : Dimmer lamp switch

Continuation of the front page (56) Reference JP 63-180539 (JP, A) JP 63-180538 (JP, A) JP 58-221734 (JP, A) JP 63-61659 (JP , A) JP 62-181939 (JP, A) Actually opened 63-164046 (JP, U) Actually opened 63-26453 (JP, U) Actually opened 62-51046 (JP, U) Actually opened 62-8133 (JP, U)

Claims (1)

[Claims] 1. A main lamp switch and a dimmer lamp switch, a pair of main lamp filament and a dimmer lamp filament respectively provided on the left and right sides of a vehicle, an ignition switch is turned on, and both the main and dimmer lamp switches are turned off. Determining circuit that outputs a switching signal, and a lighting circuit switching circuit that forms a first lighting circuit when the switching signal is not output and a second lighting circuit when the switching signal is output. When the first lighting circuit is formed, the left and right main lamp filaments and dimmer lamp filaments are respectively connected in parallel to a battery power source, and the dimmer lamp filament is turned on by turning on the dimmer lamp switch. Power is turned on and the main lamp switch is turned on. When the main lamp filament is energized and the second lighting circuit is formed, the pair of left and right main lamp filaments and the dimmer lamp filament are connected in parallel to each other and the left and right parallel connection circuits are connected in series. A lighting control device for a vehicle headlamp, wherein each pair of the dimmer lamp filament and the main lamp filament is energized even when the dimmer lamp switch and the main lamp switch are off.