JPH0335631Y2 - - Google Patents

Description

[Detailed explanation of the idea]

<Industrial Application Field> The present invention relates to a headlamp lighting circuit for an automobile, and more particularly to a circuit that can automatically turn on the headlamp during daytime driving and prevent the illumination in the instrument panel from dimming. <Prior Art> Generally, headlamps are turned on when driving at night, but as the weather and climate change, it becomes necessary to turn on headlamps even during daytime driving to prevent accidents. In particular, depending on the location, you may be in a situation where you have to keep the headlamp on all the time, not only at night but also during the day. In other words, a control circuit is required that allows the headlights to be turned on at all times when the ignition switch is turned and the engine is running, and at night, the necessary lighting and switching can be performed according to the driver's will. FIG. 3 shows a conventional electrical circuit of this type. In Fig. 3, a headlamp lighting circuit C including a key switch (ignition switch) _KSW includes two sets of an upper beam headlamp UL and a lower beam headlamp LL (only one set is shown in Fig. 4). ) and a lighting switch to turn on the head lamp.
It is equipped with L _SW , a daylight switch D _SW that switches between the upper beam headlamp lighting mode and lower beam headlamp lighting mode, and a passing switch P _SW that turns on the upper beam headlamp UL. Here, the lighting switch L _SW is equipped with an H terminal, a T terminal, and a ground terminal, as well as a HED contact piece for the headlamp lighting mode, which has a current-carrying part for the H terminal, T terminal, and ground terminal.
Equipped with a TAIL contact piece for tail lamp lighting mode that has a current-carrying part to the T terminal and ground terminal, and an OFF contact piece for lamp off mode that does not have a current-carrying part, and a lighting switch can be set according to each mode.
When the L _SW is operated, electricity is applied between each terminal on each contact piece. For example, when the lighting switch L _SW is set to the head lamp lighting mode, the H terminal and the T terminal are connected to the ground terminal, and when the lighting switch L SW is set to the tail lamp lighting mode, the T terminal is connected to the ground terminal. In addition, the daylight switch D _SW has a U terminal connected to the upper beam headlamp UL and an L terminal connected to the lower beam headlamp LL. By selectively operating the switch piece, the U terminal or L terminal can be connected to the ground side. It can be done. Furthermore, the passing switch P _SW has a terminal connected to the atsupah beam headlamp UL and a P terminal used for control, and each terminal is linked by a switch piece to connect to the ground side ( It is configured to turn on (on) and turn on (off). Furthermore, the first relay switch is used to turn on the lower beam headlamp LL without depending on the lighting mode of the daylight switch D _SW .
RLY1, daylight switch D _SW and passing switch P _SW for atspa beam headlamp
A second relay switch RLY2 for controlling the lighting state of the UL is provided in the headlamp lighting circuit C. That is, one end of each of the lower beam headlamp LL and upper beam headlamp UL is connected to the positive end of battery B via the headlamp relay switch HRLY and key switch K _SW , while the other end of the lower beam headlamp LL is connected to the daylight switch D _SW. is grounded through the L terminal of the first relay switch RLY1.
It is grounded through. In addition, the other end of the headlamp UL for Atsupa beam is
Through the second relay switch RLY2, the U terminal of the daylight switch _DSW and the passing switch are connected.
It is connected to P _SW and grounded through these daylight switches D _SW and passing switches P _SW . In this way, the first relay switch RLY1
is connected in parallel with the daylight switch D _SW , while the second relay switch RLY2 is connected in series with the daylight switch D _SW and the passing switch P _SW . Note that the daylight switch D _SW and the passing switch P _SW are connected in parallel to each other. Further, both the first relay switch RLY1 and the second relay switch RLY2 are normally open type relay switches (meaning that they are relay switches that are normally open and close when excited). By the way, when the key switch K _SW is on (in the ignition position), even when the lighting switch L _SW is in the headlamp off mode (OFF), at least one of the upper beam headlamp UL and the lower beam headlamp LL is turned on. A control circuit (control means) CC that outputs a switch opening/closing control signal to each excitation coil of the first relay switch RLY1 and the second relay switch RLY2 upon receiving signals from the key switch K _SW and the lighting switch L _SW .
is provided. This control circuit CC is connected to the first relay switch RLY
1. Second relay switch RLY2, head lamp relay switch HRLY, transistor Tr for controlling the opening/closing of tail lamp relay switch TRLY and rear rear engine relay switch RRLY.
1. It is composed of Tr2, diodes D1 to D10, resistors R1 to R5, etc., and
It has 10 external connection terminals T1 to T10. Here, the first relay switch RLY1 has one end of its excitation coil connected to the ignition terminal IC of the key switch _KSW , and the other end of the excitation coil connected to the connection terminal T3, the diode D7,
It is grounded via the transistor Tr1 and the connection terminal T2. Therefore, when the transistor Tr1 is turned on, the excitation coil of the first relay switch RLY1 becomes energized. The second relay switch RLY2 has one end of its excitation coil connected to the accessory terminal ACC of the key switch _KSW , and the other end of the excitation coil connected to the connection terminal T4, the diode D1, and the connection terminal T8. In addition to being connected to the P terminal of the switch P _SW , the other end of the excitation coil is connected to the H terminal of the writing switch L _SW via the diode D11 after the connection terminal T8.
As a result, it is grounded (ie, energized) when the passing switch P _SW is on or the lighting switch L _SW is in the headlamp lighting mode. In addition, the head lamp release switch HRLY is
One end of the excitation coil is connected to the accessory terminal ACC of the key switch _KSW , and the other end of the excitation coil is connected to the connection terminal T9 and the diode D.
4. Passing switch via connection terminal T8
In addition to being connected to the P terminal of P _SW , there is also a connection terminal T.
8 and is connected to the H terminal of the lighting switch _LSW via the diode D11. Therefore, in this case as well, it is grounded (ie, energized) when the passing switch P _SW is on or the lighting switch L _SW is in the headlamp lighting mode. Also, the tail lamp relay switch TRLY is
One end of the excitation coil is connected to the positive end of the battery B, and the other end of the excitation coil is connected to the connection terminal T5, the transistor Tr2, and the connection terminal T2.
In addition to being grounded via the connection terminal T5, it is connected to the T terminal of the lighting switch _LSW via the diode D10 and the connection terminal T10. Therefore, whether transistor Tr2 turns on or
When the lighting switch L _SW enters the head lamp lighting mode or tail lamp lighting mode, the excitation coil of the tail lamp relay switch TRLY becomes energized. Furthermore, the connection terminal T1 of the control circuit CC is externally connected to the ignition terminal of the key switch _KSW , but internally connected to the transistor Tr1 via a resistor R1, a diode D5, and a resistor R3. In addition to being connected, it is also connected to a resistor R1, a diode D3, and a connecting terminal T10, and is further connected to a resistor R1, a diode D2, and a connecting terminal T8, and is also connected to a transistor Tr2 via a resistor R2.
is also connected. Note that the connection terminals T6 and T7 of the control circuit CC are
This is for the first connector CT1 for the rear camera Grand Prix race switch RRLY. Further, in FIG. 3, the symbol connector CT2 indicates a second connector for the rear auxiliary front lamp race switch RRLY, R _SW indicates a rear auxiliary auxiliary lamp switch, and RFL indicates a rear auxiliary front lamp. A key switch in a circuit with this configuration
Table 1 shows the on/off states of the relay switches according to the switch positions of K _SW , lighting switch L _SW , daylight switch D _SW , and passing switch P _SW , and the lighting states of the upper beam headlamp UL, lower beam headlamp LL, and tail lamp. Shown below. In the column of key switch K _SW in Table 1, the IC indicates that key switch K _SW is in the ignition position (at this time, the ignition terminal is closed, and when the ignition terminal is closed in this way, the accessory terminal is also closed). means,
ACC means that the key switch K _SW is in the accessory position (at this time, the ignition terminal is open but the accessory terminal is closed). Also, in the column for lighting switch L _SW , HEAD means that the lighting switch L _SW is in the headlamp lighting mode, OFF means that the lighting switch L _SW is in the lamp off mode, and TAIL means that the lighting switch L SW is in the tail lamp lighting mode. It means something.

[Table] Furthermore, in the column of day switch D _SW , L
means that the daylight switch D _SW turns on the L terminal, and U means that the daylight switch D _SW turns on the U terminal. Furthermore, in the column of the passing switch P _SW , OFF means that the passing switch P _SW is in the open (off) state (at this time, the P terminal is also off), and ON means that the passing switch P SW is in the open (off) state (at this time, the P terminal is also off).
This means that the P _SW is closed (on) (at this time, the P terminal is also on). In the lower beam headlamp LL, upper beam headlamp UL, and tail lamp columns, ○ means the lamp is on, and × means the lamp is off. In the column for relay switches, ○ means that the relay switch contacts are closed (on), and × means that the relay switch contacts are open (off). From Table 1, it can be seen that if the key switch K _SW is in the IG position, at least one of the lower beam headlamp LL and the upper beam headlamp UL is turned on even when the lighting switch L _SW is in the headlamp off mode. In other words, as long as the engine is running, the headlights can be turned on day or night. Next, the operation state of the circuit shown in FIG. 3 as shown in Table 1 will be explained by giving several examples, focusing on the lighting states of the lower beam headlamp LL and the upper beam headlamp UL. (1) Key switch K _SW is in IG position, lighting switch L _SW is in headlamp off mode (OFF),
When the daylight switch D _SW is on the L terminal side and the passing switch P _SW is off. At this time, the key switch K _SW is in the IG position and the lighting switch L _SW is in the headlamp off mode, so the transistor Tr1 is on. Therefore, the head lamp release switch HRLY
The excitation coil is connected to connecting terminal T9 and diode D.
6. Since the transistor Tr1 is grounded through the connection terminal T2, the head lamp relay switch HRLY is turned on. In this case, since the daylight switch D _SW is on the L terminal side, the lower beam headlamp LL lights up. (2) Key switch K _SW is in IG position, lighting switch L _SW is in headlamp off mode (OFF),
When the daylight switch D _SW is on the L terminal side and the passing switch P _SW is on. At this time, the P terminal of the passing switch P _SW becomes the ground side, so the connection terminal T9 is grounded via the diode D4 and the connection terminal T9.
Head lamp relay switch HRLY is on. On the other hand, the connection terminal T1 has a resistor R1,
It is grounded via the diode D2 and the connection terminal T8, so that the transistor Tr1 is turned off. Therefore, the first relay switch
RLY1 is turned off, but since the daylight switch _DSW is on the L terminal side, the lower beam headlamp LL lights up. In addition, since the connection terminal T4 is grounded via the diode D1 and the connection terminal T8, the second relay switch RLY2 is turned on, which energizes the Atsupa beam headlamp UL through the passing switch P _SW , and the Atsupa beam headlamp UL is energized via the passing switch P SW. UL also lights up. (3) Key switch K _SW is in IG position, lighting switch L _SW is in headlamp off mode (OFF),
When the daylight switch D _SW is on the U terminal side and the passing switch P _SW is off. At this time, the key switch K _SW is in the IG position and the lighting switch L _SW is in the headlamp off mode, so the transistor Tr1 is on. Therefore, the head lamp release switch HRLY
The excitation coil is connected to connecting terminal T9 and diode D.
6. Since the transistor Tr1 is grounded through the connection terminal T2, the head lamp relay switch HRLY is turned on. Also, transistor
Since Tr1 is on, the first relay switch RLY1 is also on, which lights up the lower beam headlamp LL. (4) Key switch K _SW is in IG position, lighting switch L _SW is in headlamp off mode (OFF),
When the daylight switch D _SW is on the U terminal side and the passing switch P _SW is off. At this time, the P terminal of the passing switch P _SW becomes the ground side, so the connection terminal T9 is grounded via the diode D4 and the connection terminal T9.
Head lamp relay switch HRLY is on. On the other hand, the connection terminal T1 has a resistor R1,
R2 is grounded via the connection terminal T8, thereby turning off the transistor Tr1.
Therefore, the first relay switch RLY1 is turned off, and since the daylight switch _DSW is on the U terminal side, the lower beam headlamp LL is turned off.
goes out. In addition, since the connection terminal T4 is grounded via the diode D1 and the connection terminal T8, the second relay switch RLY2 is turned on, which energizes the Atsupa beam headlamp UL through the passing switch P _SW , and the Atsupa beam headlamp UL is energized via the passing switch P SW. UL lights up. (5) When the key switch K _SW is in the IG position, the lighting switch L _SW is in tail lamp lighting mode (TAIL), the daylight switch D _SW is on the L terminal side, and the passing switch P _SW is off. The connection terminal T1 has a resistor R1, a diode D3,
Since it is grounded via the connection terminal T10, the transistor Tr1 is off. Furthermore, since the H terminal of the lighting switch L _SW and the passing switch P _SW are off, the head lamp relay switch HRLY is off. Therefore, lower beam headlamp LL
Neither the Atsupa beam headlamp UL lights up. The reason why we created the headlamp off mode in the tail lamp on mode of the lighting switch L _SW is because there is a demand for turning off the headlamp while parking, for example. (6) When the key switch K _SW is in the IG or ACC position, the lighting switch L _SW is in headlamp lighting mode (HEAD), the daylight switch D _SW is on the L terminal side, and the passing switch P _SW is off. Since the lighting switch L _SW is in the headlamp lighting mode, the H terminal of the lighting switch L _SW is grounded, so that both the headlamp relay switch HRLY and the second relay switch RLY2 are closed (on).
Also, since the T terminal of the lighting switch L _SW is also grounded, the transistor Tr1 is off, and the first relay switch RLY1 is turned off.
is open (off). At this time, since the daylight switch D _SW is on the L terminal side, the lower beam headlamp LL lights up, but since the passing switch P _SW is off, the upper beam headlamp UL does not light up. (7) When the key switch K _SW is in the IG or ACC position, the lighting switch L _SW is in headlamp lighting mode (HEAD), the daylight switch D _SW is on the L terminal side, and the passing switch P _SW is off. Since the lighting switch L _SW is in the headlamp lighting mode, the H terminal of the lighting switch L _SW is grounded, so that both the headlamp relay switch HRLY and the second relay switch RLY2 are closed (on).
Also, since the T terminal of the lighting switch L _SW is also grounded, the transistor Tr1 is off, and the first relay switch RLY1 is turned off.
is open (off). At this time, since the daylight switch D _SW is on the L terminal side, the lower beam headlamp LL is lit, and since the passing switch P _SW is on, the upper beam headlamp UL is also lit. Note that in other cases, the operation can be easily understood from the circuit shown in FIG. In this way, the head lamp release switch
In addition to HRLY and tail lamp relay switch TRLY, there are two relay switches RLY1,
By controlling the opening and closing of RLY2, the lighting switch L _SW is set to headlamp lighting mode.
When driving at night, the lighting status of the headlights can be controlled based on the driver's intention to operate the headlights, and even if the lighting switch L _SW is set to the headlamp off mode, the lighting status of the headlights can be controlled during daytime driving regardless of the driver's intention to operate the headlights. , the headlamp can be turned on automatically. <Problem that the invention aims to solve> However, in the circuit that automatically turns on the headlights during daytime driving, the key switch is
Since the tail lamps are always on when the K _SW is in IG mode, the brightness of the clock and electronic meter on the instrument panel is reduced in the same way as when driving at night, and the brightness of the lamps is not sufficient when driving during the day. It is becoming difficult to see. That is, conventionally,
When the tail lamp lights up, the clock and electronic meter detect this and dim the light. Therefore, in view of the above-mentioned drawbacks, the present invention aims to provide a headlamp lighting circuit for an automobile that does not dim the brightness of a clock or electronic meter during daytime driving even if the tail lamp is lit. <Means for Solving the Problems> The present invention achieves the above object by providing a headlamp lighting circuit including a key switch with an upper beam headlamp and a lower beam headlamp in an automobile, and a lighting switch for lighting the headlamp. , a daylight switch for switching between the atsupa beam headlamp lighting mode and the lower beam headlamp lighting mode, and a passing switch for lighting the atsupa beam headlamp, so that the lower beam headlamp is turned on without depending on the lighting mode of the daylight switch. In order to
A second relay switch connected in series with the above-mentioned daylight switch and passing switch is provided in the headlamp lighting circuit in order to control the lighting state of the above-mentioned attenuation beam headlamp by the relay switch and the above-mentioned daylight switch and passing switch. , in order to turn on at least one of the upper beam headlamp and lower beam headlamp even when the lighting switch is in the headlamp off mode when the key switch is on, the above-mentioned lighting switch receives signals from the key switch and the lighting switch. 1st relay switch and 2nd
A control means is provided that outputs a switch opening/closing control signal to the relay switch, and includes a transistor that is connected to the tail terminal of the lighting switch and turns on when this terminal is turned on, and the dimming mode is set only by turning on this transistor. It is characterized by being equipped with a lighting circuit. <Example> Here, an example of the present invention will be described with reference to FIGS. 1 and 2. Note that in FIGS. 1 and 2, the same parts as in FIG. 3 are given the same reference numerals, and their explanations will be omitted. In Figure 1, the control circuit
CC is further provided with control terminals T ₁₁ and T ₁₂ , and between these control terminals T ₁₁ and T ₁₂ a parallel body of a constant voltage diode Z and a transistor T _r3 is connected in the control circuit CC. The base of T _r3 is connected to the control terminal T ₁₀ via a bias resistor. Further, the control terminal _T11 is located outside the control circuit CC and is connected to the load side of the tail lamp relay switch TRL. Furthermore, the control terminal _T12 is an example of the clock CL.
is connected to the TAIL terminal of the In addition to the TAIL terminal, this watch CL is equipped with a B terminal connected to the power supply, an accessory terminal ACC, and a ground terminal B. Although there are other lighting devices such as electronic meters in addition to clocks, a clock is used here as an example. By adding such a circuit, it is determined whether or not the light is dimming depending on the potential of the terminal _T10 of the control circuit CC. In other words, the lighting switch L _SW is
When applied to HEAD or TAIL, control terminal _T10 is grounded and transistor T _r3 is turned on. Furthermore, when the writing switch L _SW is not turned on, the transistor T _r3 is always off. Therefore, the writing switch L _SW is set to HEAD or
Tail lamp relay switch that connects the TAIL terminal of clock CL to power supply B when turned on to TAIL.
It is connected to the load side of TRLY and has a high potential, so the current value from the terminal ACC inside the clock CL decreases and the illumination inside the clock CL is dimmed. Also, when the lighting switch L _SW is not turned on,
The TAIL terminal becomes a low potential, and a large current flows through the lighting circuit, making the lighting brighter. In addition, since the clock CL drives the clock itself, it is connected to the power supply B and the ground terminal E.
ACC is used as a power source for lighting on the clock CL.
is used to control the current from this power supply ACC.
terminal is used. As mentioned above, the lighting switch is
The L _SW is turned on and the lighting switch is turned on during the day.
By not turning on the L _SW , the lighting inside the clock CL is dimmed at night and increased during the day, so that the lighting during the day does not dim. FIG. 2 shows a dimming countermeasure circuit for the clock CL and electronic meter M shown in FIG. In Figure 2, the load side of the tail lamp relay switch TRLY is connected to the TAIL terminal of the rheostat RS.
In this rheostat RS, the TAIL terminal is connected to the base of transistor T _r4 and the switch
Connected to tail cancel terminal TC via T _SW . The tail cancel terminal TC is connected to the TAIL terminal of the clock CL via the control terminals T ₁₁ and T ₁₂ of the control circuit CC, and is also connected to the TC terminal of the electronic meter M. Among these, the switch T _SW of the rheostat RS is turned on when the lighting switch L _SW is turned on, and is opened when the lighting switch L _SW is turned off. That is, when the lighting switch L _SW is turned on and the switch T _SW is closed, the transistor T _r3 of the control circuit CC is turned on, and the clock CL is dimmed and the lighting L1 of the electronic meter M is dimmed.
The switch connected to the terminal is switched. When the lighting switch L _SW is off, the switch T _SW is opened and the transistor T _r3 is turned off, so that the clock CL does not dim, and the lighting L1 of the electronic meter M is also grounded by switching the switch and does not dim. Note that the illumination L2 of the ILLD terminal of the electronic meter M is lit as long as the transistor T _r4 is on. <Effects of the invention> As explained above, according to the invention, even in vehicles where the headlights are turned on during daytime driving, the lights are bright during the day and dimmed at night, making it difficult to see the electronic meters and clocks. has disappeared.

[Brief explanation of drawings]

Figure 1 is a circuit configuration diagram of an embodiment of the present invention;
This figure is a circuit diagram of another embodiment of the present invention, and FIG. 3 is a circuit diagram of a conventional example. In the drawing, T ₁₁ and T ₁₂ are control terminals, T _r3 and T _r4 are transistors, CL is a clock, M is an electronic meter, and T _SW
is a switch, and L1 and L2 are lights.

Claims (1)

[Scope of utility model registration request] In an automobile, a headlamp lighting circuit including a key switch is provided with a headlamp for an upper beam and a headlamp for a lower beam, and a lighting switch for lighting the headlamp, a daylight switch for switching between an upper beam headlamp lighting mode and a lower beam headlamp lighting mode; A passing switch for lighting the upper beam headlamp, a first relay switch connected in parallel with the daylight switch, and a first relay switch connected in parallel with the daylight switch in order to light the lower beam headlight in a state independent of the lighting mode of the daylight switch. and a second relay switch connected in series with the daylight switch and the passing switch to control the lighting state of the atsupah beam headlamp by the passing switch.
A switch is provided in the headlamp lighting circuit so that when the key switch is on, at least one of the upper beam headlamp and the lower beam headlamp is turned on even when the lighting switch is in the headlamp off mode. control means that outputs a switch opening/closing control signal to the first relay switch and the second relay switch in response to the signal, and includes a transistor that is connected to the tail terminal of the lighting switch and turns on when this terminal is turned on. 1. A headlamp lighting circuit for an automobile, comprising: a lighting circuit which is set in a dimming mode only when the transistor is turned on.