JPS58224820A - Vehicle head light switching device - Google Patents

Abstract

PURPOSE:To prevent a light flashing signal from being misunderstood as the signal which is for ahead vehicles, in a head light switching device for a vehicle or the like, in which head lights are flashed in accordance with signals from a vehicle speed sensor, by providing a hysteresis circuit which actuates under a predetermined condition. CONSTITUTION:When the speed of a vehicle becomes relatively low, a vehcile speed sensor 1 lowers voltage at the point C, resulting in that transistors T2, T3 constituting a hysteresis circuit 9, are turned off and on, respectively, so that charged current in a capacitor C4 is fed to a transistor T4 through a resistor R11 for turning on head lights 5 for a predetermined time period. Further, upon the vehicle accelerating, the transistor T4 is turned on after the capacitor C4 is charged, and therefore, the head lights are turned on through a relay K1. Accordingly, the head lights are prevented from flashing even upon the vehicle slowly running due to a trafic snarl, and therefore, there are no fear that no signal for ahead vehicles is issued. Further, after the elapse of a predetermined time from a stopping, the capacitor C4 discharges its charged current so that transistors T4, T5 are turned off and on, respectively, and therefore, relays K1, K2 are energized for turning off the head lights 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching device for automatically blinking headlights in a vehicle such as an automobile.

An automatic switching device that turns on the headlights when the vehicle starts traveling and turns them off when the vehicle stops is known.

This system uses a vehicle speed sensor to detect when the vehicle is stopped and performs a switching operation, and the headlights often flash, especially when driving at low speeds during traffic jams at night.
There was a drawback that the signal could be mistaken for a sign for the vehicle in front.

An object of the present invention is to propose a headlight switching device that can eliminate such drawbacks.

That is, the present invention provides a switching device that is equipped with a vehicle speed sensor that sends a signal corresponding to the speed of the vehicle, and that flashes the headlights in response to the signal from the vehicle speed sensor, which is activated when the vehicle speed exceeds a certain value. A hysteresis circuit that recovers when the temperature drops below a certain value, which is lower than a certain value, and a time constant circuit that operates with the output of this hysteresis circuit are installed, and the headlights are turned off after a certain period of time determined by the time constant circuit after the hysteresis circuit is restored. It is characterized by:

Next, a description will be given based on the embodiments shown in the drawings.

In Figure 1, the vehicle speed sensor (January 1) is composed of a magnet (2) that rotates in conjunction with the speedometer cable, and a magnetic sensor (3) placed close to this magnet. The third pin of the terminal is connected to the base of the transistor (T1).The magnetic sensor (3) is shown in a simplified manner in the drawing, but it is actually a Hall IC made by Matsushita Electric that combines a Hall element with an amplifier. ,DN Otsu!r3g
Use the power terminal 1. Ground terminal 2. The output terminal 8 is connected as shown in the figure, and the magnet (2) rotates while the vehicle is running, and a rectangular wave signal is output to the output terminal 8 of the magnetic sensor (3). Note that a reed switch may be used as the magnetic sensor (3) instead of the Hall IC.

(Sl) is the key switch of the vehicle, (82) is the main switch of the headlight switching device of the present invention, (83) is the lamp lighting switch, (S4) is the dimmer switch, (C
5) is a switch linked to the handbrake and closes when the handbrake is applied. (S6) is the room lamp switch, and (S7) is the door switch, which closes when the door is opened. (4) is a small lamp, (5) is a headlight, (6) is a lamp that lights up when the handbrake is applied, (7) is a room lamp, (R1) to (R16)
), (RA), (RB) are resistors, (C1) to (C7) are capacitors, (Dl) to (Dlo) are auto parts, (T
1) to (T5) are transistors, (K1) and (R2) are relays, (BZ) is a buzzer 1, and (EE) is a battery, which are connected as shown in the figure.

When the lamp lighting switch (S3) is now closed, the small lamp (4) and headlight (5) are turned on.

When the key switch (Sl) and main switch (82)' are closed, voltage is supplied to the transistor circuit, but since the vehicle is stopped, the vehicle speed sensor (1) does not output a running signal. Therefore, the voltage at the 8 collector points of the transistor (T1) does not change, and the transistor (T2) is turned off.
, (T3) is ON, (Ta) is OFF', (T5) is O
N, the relay (Kl) operates and its make contact closes, so the relay (R2) also operates and the headlight (5
) goes out.

When you start the engine and start driving, the vehicle speed sensor (1
) sends out a rectangular wave signal with a frequency corresponding to the vehicle speed and passes the transistor (T1) 60N, OF'F'.

Therefore, the capacitor (
C3) is charged, but when the vehicle speed is below a certain level, the voltage at the 0 point does not rise enough to make the transistor (T2) conductive. Transistors (T2), (T3) and resistor (R6
) to (RIO) constitute a hysteresis circuit (9), which operates when the vehicle speed exceeds a certain value and turns on the transistor (T2).
is ON and (T3) is OF'F', but the vehicle speed at this time is adjusted by adjusting resistance (R4)' to be around 10 bl/H. Transistor (T3) is OF'
When F K, resistance (Rho) and diode (D5) t
The capacitor (C4) is charged through l-, the transistor (T4) becomes conductive, and the transistor (T5) becomes OFF'F.
', the relay (K1) is restored, its make contact opens, the relay (R2) is also restored, and the headlight (5
) lights up.

The hysteresis circuit (9) has a resistor ( Since the values of R6) to (RIO) are fixed, when the vehicle speed becomes considerably low, the transistor (T2) is turned OFF' and the transistor (T3) is turned ON.

At this time, the charge of the capacitor (C4) is transferred to the resistance (R11)
t'' to the base of the transistor (T4), and the time is approximately determined by the time constant of the resistor (R11) and the capacitor (C4). If you set it by adding or subtracting ',
If the vehicle speed is low or stopped for a short period of time, the transistor (T2
) becomes OFF'F, the transistor (T4) remains ON and the headlights remain lit. Even if you temporarily slow down or stop in this way, there will be no resistance (
Since the time constant circuit consisting of R11) and capacitor (C4) is connected to the hysteresis circuit (9), the
Even when driving slowly, the headlights will no longer flash, eliminating the risk of being mistaken as a sign for the vehicle ahead.

After a certain period of time has elapsed after stopping, the charge in the capacitor (C4) is discharged, and the transistor (T4) turns off (T5).
is turned ON, relays (Kl) and (K2) are activated and the headlights are turned off.

In this embodiment, a pulse oscillator OQ is provided that sounds a buzzer (Bz) to warn of forgetting to apply the handbrake or forgetting to remove the key switch.

When the door of the vehicle is opened and the door switch (S7) is closed, the pulse oscillator Ql starts oscillating as the No. 7 pin (ground terminal) of the IC (IC) is grounded via the diode (D8), and the buzzer (BZ) is activated. ).

- Pulse oscillator (the IC configuring 10 is a well-known Mitsubishi Electric Electrode M3/ZA/P or a timer IC manufactured by Signetakes)
, NB555 f is used. Connect the No. 7 bin (discharge terminal) of this timer IC to one end of the handbrake switch (B5) as shown in the diagram, and connect the diode (DIO) and the handbrake lamp (6). : Connect to key switch (31) K via.

Now pull the handbrake and switch the handbrake switch (
35) When t-closed, IC (
The 7th bin (discharge terminal) of the IC) is grounded, and the voltage of the 7th bin drops. At this time, the resistance value t-
If set to X, oscillation will stop by pulling the handbrake. Door switch (S7) when the door is closed
opens and oscillation stops. If you forget to pull the handbrake and open the door, oscillation starts, but the oscillation frequency at this time is f1# /, 4t4 // (RA + 2RB) · C7 when the key switch (Sl) is not closed.
1.''), and when the key switch (Sl) is closed, the resistance R', which is the sum of the resistance value of the handbrake lamp (6) and the value of the resistance (Rx6), is connected in parallel with the resistance (RA). Therefore, if the parallel resistance value of RA and R' is 2 RA/R', then
The oscillation frequency @f2 at this time is f2 center/protection/(RA/R'+2RB)·C7, which is higher than fl. Note that C7 is the capacitance of the capacitor connected between the 2nd bin and the 7th bin. If you forget to use the handbrake and try to leave the vehicle, a warning buzzer (BZ) will sound, but the pitch of the sound is different depending on whether the key switch is closed or open, so you may forget to remove the key. You can notice it right away.

In the embodiment shown in FIG. 7, when the key switch (Sl) and the main switch (82) are closed, the amplifier (8) is activated.
If the vehicle is stopped for a certain amount of time, the headlights will turn off. In addition, the headlights are turned off even before the vehicle starts driving. Generally, when driving at night, it is better to have the headlights on even if you are stationary until you start the engine and start driving because you can see the condition of the car.
Once the vehicle starts running and stops, it is convenient to automatically turn off the light if the vehicle stops for a certain period of time or more, as this makes driving operations easier. Figure 2 shows a part of the circuit in Figure 1 that has been modified in consideration of this point. ).

(R18) 08C which is additionally connected as shown in the figure.
R is one transistor (T5) of the amplifier (8)
It is directly inserted into the collector resistor of the transistor (T5), and its gate is connected to the collector of the transistor in the previous stage of the transistor (T5) via the resistor (R11).

In the embodiment shown in FIG. 2, the headlight lighting switch (83
)? When the key switch (Sl) is closed and the headlights are on, the main switch (32) is closed and the transistor (T2) is turned on because the vehicle is not running yet.
) is OFF', (T3) is ON, (T4) is OFF'
However, when the transistor (T3) is turned on, its collector potential decreases, and the gate potential of SCH decreases.
Since CR also remains OFF, the transistor (T5
) is also OFF, the relay (K1) is not activated and the headlight (5) remains on. When you start driving and the vehicle speed reaches a certain level, the hysteresis circuit (9
) transistor (T2) is ON, (T3) is OFF
Since the voltage becomes F, the transistor (T4) and the SCR are turned on. Since the current flowing through the SCR flows into the lefter of the transistor (T4), the transistor (T5) is OF
The headlight (5) remains lit until F'. When the vehicle stops for a certain period of time after running, the transistor (T4) turns OFF' as in the case of FIG.
At this time, SCR is conductive although its gate potential drops, so resistors (R13) and (R14) are connected from its cathode to
Current flows through the base of the transistor (T5), making the transistor (T5) conductive and activating the relay (K1), which also activates the relay (K2) and turns on the headlights (5).
goes out. The SCR returns to OF'F' by opening the main switch or key switch.

As described above, in the embodiment shown in FIG. 2, the headlights are always on until the vehicle starts driving for the first time, and when the vehicle stops for a certain period of time after driving, the headlights are automatically turned off, which is convenient for driving.

As mentioned above, in this invention, when driving slowly, the headlights do not flash and automatically turn off when the headlights stop for a certain period of time, so there is no risk of them being mistaken for signs for the vehicle in front. Since the Radry F remains lit until the start of driving, it is convenient for driving.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 shows an electric circuit of the seventh invention, and the second figure shows an electric circuit of the second embodiment. (1)... Vehicle speed sensor (5) 1... Headlight (8)... Amplifier (9)... Hysteresis circuit (R11)... Resistor (C4) that constitutes the time constant circuit...
... Capacitor (T4) that constitutes the time constant circuit ... Transistor (R13) that operates with the output signal of the time constant circuit ... Collector resistor (SCR) ... Silicon controlled rectifier (T3) ...
Mizuno Kogeisha, a limited liability company that applied for the transistor patent in the previous stage

Claims (1)

[Claims] 1. A switching device that is equipped with a vehicle speed sensor that sends a signal corresponding to the vehicle speed and that flashes and flashes the headlights in response to the signal from the vehicle speed sensor, which is activated when the vehicle speed exceeds a certain value. We also have a hysteresis circuit that recovers when it goes below a certain value, which is lower than this certain value, and a time constant circuit that operates with the output of this hysteresis circuit, and after the hysteresis circuit recovers, the headlights turn off after a certain period of time determined by the time constant circuit. A vehicle headlight switching device characterized by: 2. In a switching device that is equipped with a vehicle speed sensor that sends out a signal corresponding to the speed of the vehicle and that flashes the headlights in response to the signal from the vehicle speed sensor, it is activated when the vehicle speed exceeds a certain value and is lower than this certain value. A hysteresis circuit that recovers when the value falls below a certain value and a time constant circuit that operates with the output of this hysteresis circuit are provided, and the headlights are turned off after a certain period of time determined by the time constant circuit after the hysteresis circuit recovers. Furthermore, a silicon-controlled rectifier is inserted in series with the collector resistor of a transistor operated by the output signal of the time constant circuit, and the gate of the silicon-controlled rectifier is connected to the collector of the transistor in the preceding stage of the transistor. Switching device.