JPS5942296Y2 - Headlamp cleaner control circuit - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a circuit for controlling the sound of a headlamp cleaner device that dynamically cleans the front surface of the headlamp of a vehicle.
In particular, the present invention relates to a highly reliable headlamp cleaner control circuit that is not affected by noise generated from a motor power source and does not malfunction.

A conventional Herad lamp cleaner control circuit is shown and explained in Figure 1. In the figure, IGSW is an ignition switch, LSW is a light switch, and one end of each of these ignition and light switches IGSW and LSW is all grounded on the negative terminal side. The power supply (batch IJ) is connected to the positive side of B.

H8W is a heater switch, WSW is a wiper switch,
One end of each of these heaters, wiper switch H8W, WSW is connected to the ignition switch IGSW, and the other end is connected to the heater pro-ar motor M1. It is grounded via wiper motor M4.

Here, the heater pro-aper motor M1 is a motor that warms all the water in the washer tank (not shown) to make it wet, and the wiper motor M4 is a motor that fully operates the grade on the front of the window and removes dirt on the front. This is a motor for cleaning.

In addition, M2 is a window washer motor for pouring muddy water from the washer tank onto the cleaning window, and M3 is a helad lamp for pouring muddy water from the washer tank onto the front of the headlamp (not shown) and cleaning all the dirt on the front of the headlamp. The headlamp cleaner motor M3 is configured to fully operate a pump (not shown) in conjunction with the operation of the motor to spray cleaning liquid contained in a tank onto the headlamp surface.

The operating switch O8W is a window washer switch, and is shared with the operating switch oswr headlamp cleaner switch.

Yes, a headlamp cleaner is used to remove all the mud and snow that adheres to the headlights of a vehicle while driving.

Therefore, the cleaner switch is provided at a position where the driver can easily operate it while the vehicle is running.

1. Both the ignition switch IGSW and the light switch LSW are in the on state and in the standby state, and at this time, the battery B (t) - light switch LSW - diode D1 - resistor R3 - resistor R5 - capacitor C1 (t) - diode D2 - Transistor Q1 (base-emitter)
- A charging current flows through the entire grounding path, and the capacitor C□ is charged with the Zener voltage 1 of the Zener diode 2.

Then, a current flows through this charging current and the entire path from resistor R□ to diode D2 to transistor Q1 (base-emitter) to ground as the base current of transistor Q1, and transistor Ql turns on. , transistor Q2 is in an off state.

Next, when the operation switch oswt is turned on, the potential at point a is reduced by the voltage division between resistor R5 and resistor R2.

Therefore, the voltage at point b is shifted to a negative value by the voltage decreased at point a, transistor Q1 is turned off, and transistor Q2 is turned on.

When transistor Q2 turns on, relay RL operates,
Since the contact CP is closed, the headlamp cleaner motor M3 rotates.

Then, when transistor Q2 turns on, battery B-
The current is terminated through the entire path of light switch LSW - diode D1 - resistor R3 - resistor R - diode D3 - transistor Q2 (collector/emitter) - ground, and the voltage at point a suddenly drops to near the ground voltage.

Further, the potential at point b will also become more negative in accordance with the change in the potential at point a.

And the charge of capacitor c1 is capacitor C1(t)
- Diode D3 - Transistor Q2 (Collector /
ivy) - ground - battery B - light switch LSW - diode DI - resistor R3 - resistor R - capacitor C1
After a time constant determined by resistor R1 and capacitor C1, capacitor C1 is discharged again.
The charging current to the resistor R0, the diode D2, and the transistor Q1 are turned on, and the transistor Q2 is turned off.

Here, the diode D3 has a hold function 4,
Even if the operating switch oswi is turned off within the time constant determined by the resistor R1 and the capacitor C1, the potential at point a is maintained at a low voltage via the diode D3, so the constant time fluctuation f'+- It is configured as follows.

In addition, the ignition switch IGSW is a diode D.
4Th forward direction is connected to relay RL, and R
Reference numeral 6 denotes a resistor KCz connected between the base batch IJB of the transistor Q1 and the negative electrode side (ground) of the transistor Q1. A resistor KCz is a capacitor connected between the base and collector of the transistor Q2.

However, in such a headlamp cleaner control circuit, the heater pro-amota M1 and the wiper motor M4 are used as loads via the ignition switch IGSWk.
Motor loads such as the following are connected, and even if the power supply is cut off, these motors will continue to rotate for a short time due to inertia.

In this state, voltage is generated at the motor power supply terminals due to the power generation action.

Then, as the rotation gradually decreases, the generated voltage also decreases, and power generation finally stops.

At this time, the power generation polarity is such that the motor positive terminal becomes the positive pole and the negative terminal becomes the negative pole.

In the standby state where the ignition switch IGSW is on, the heater switch H8W or the wiper switch WSW is on, and when the ignition switch IGSWk is turned off from this state, the motor generates electricity and the ignition power line (Power line i l) M generates this generated voltage.

Since this voltage is decreasing exponentially from the battery terminal voltage just before the ignition switch IGSW is turned off, when the voltage decreases below the voltage at point a, the charge in capacitor C1 (mountain - resistor R2 - Window washer motor M2-heater switch H8W ('7 Iha switch W
SW) - Heater lower motor M1 (wiper motor M4)
- Ground - Battery B - Light switch LSW - Diode D1 - Resistor R3 - Resistor R1 - Capacitor c1 (→ It is discharged through the entire path.

Here, the reduction time constant of the generated voltage is shorter than the discharge time constant set by resistor R1 and capacitor C1, so b
The voltage at the point is transferred to the negative voltage, and the transistor Q1
is in the off state.

At this time, since voltage still remains in the power line 11,
Battery B-Light switch LSW-Diode D1-
Resistor R4 - Transistor Q2 (base/emitter) -
A base current flows through the entire grounding path, transistor Q2 is turned on, and relay RL is activated at the same time as the hold circuit is activated.

As described above, the conventional herador lamp cleaner control circuit has the disadvantage that it may malfunction due to the so-called nozzle generated by the motor load even though the operation switch O8W♀ is not operated.

In view of the above points, the present invention was developed in order to solve such problems and eliminate such drawbacks. The lamp cleaner control circuit is to provide gold.

In order to achieve such objectives, the present invention provides second and third resistors connected in series between the positive pole side of the power supply via the ignition switch 4 and the negative pole side of the power supply connected to the operation switch The base is connected to the connection point between the second and third resistors of the diode, and the fourth resistor is connected to the first resistor of the CR time constant circuit, whose collector is connected to the positive side of the power supply via the light switch 4. The emitter is connected to the capacitor of the CR time constant circuit through the second diode and the fifth resistor in series, and the emitter is connected to the power supply through the first diode and the operating switch in series. The third transistor is connected to the negative polarity of the switching circuit, which is turned on when the operating switch is on, and is kept off when the operating switch is off.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a circuit diagram of an embodiment of a headlamp cleaner control circuit according to the present invention.

In FIG. 2, the same reference numerals as those in FIG. 1 are shown in their entirety, and the ignition switch IGSW and light switch LSW are connected in reverse to the circuit shown in FIG.

Further, the circuit within the dotted line shown in FIG. 2 is a partial gold plate corresponding to the circuit within the dotted line in FIG.

Q3 is a transistor that constitutes the entire switching circuit, and its collector is connected to the power supply line 12 via a resistor R9, and the emitter is connected to a capacitor C□ via a reversely connected diode D5 and a resistor R10 in series. is connected to the ground (the negative electrode side of batch 'JB) through the forward-connected diode D4 and the operation switch oswi in series, and the base is connected to the power supply line 13 through the resistor R7, and the above diode is connected through the resistor R8. It is connected to the anode side of D4.

Then, resistor R1 and capacitor C1 are connected in series and CR
There are 4 time constant circuits.

Further, the base of the transistor Q1 is connected to the connection point of the resistor R1 and the capacitor C1 through the diode D2, and the collector of the transistor Q2 whose base is connected to the collector of this transistor Q1 fully controls the head lamp cleaner motor M3. These are connected to the relay RL, and constitute a relay drive circuit that controls the drive time of the relay RL based on the discharge of the CR time constant circuit.

Next, the operation of the embodiment shown in FIG. 2 will be explained.

First, the light switch LSW is turned on and the ignition switch IGSW is turned on to enter a standby state.

In this standby state, when the heater switch H8W is on and the operation switch O8W is off, the capacitor C
1 is charged in the zener voltage range of zener diode 2, and zener diode z maintains the full zener voltage.

In this case, capacitor C1 is: battery B - light switch LSW - diode D4 - resistor R3 - resistor R5 - capacitor C1 - diode D2 -
) Charged throughout the transistor Ql (base-emitter)-to-ground path.

In addition, the transistor Q1 is connected to the battery B-light switch LSW-diode D4-
Resistor R3 - Resistor R1 - Diode D2 - Transistor Q
1 (Base/Ivy)-Ground path 4, the base current flows and is in the ON state, and accordingly, the transistor Q2 is in the OFF state.

Further, the transistor Q3 is turned off because the operation switch OSw is off.

In such a state, when the operation switch O8W is turned on, the ivy of the transistor Q3 is connected to the diode D4.
Since both transistors are grounded through the operation switch oswr, the transistor Q3 is turned on.

As a result, point a is connected to resistor RIO, diode D5, transistor Q3, diode D4, and operation switch o.
It is connected to ground through swr, and its voltage drops.

Correspondingly, the voltage at point b becomes a negative voltage.

This causes diode D2 to become reverse-biased, blocking the base current to transistor Q1 and causing transistor Q
1 is off.

When transistor Q1 turns off, transistor Q2 turns on, relay RL operates, and its contact cp closes 1.
The headlamp cleaner motor M3 (VCh) rotates.

Long ago, when the L-transistor Q2 was turned on, the voltage at point A became almost the ground voltage through the diode D3 and the transistor Q2.

After that, due to the discharge of the capacitor C1, the voltage at point b gradually increases, and when it becomes a positive voltage that releases the reverse bias of the diode D2, the voltage rises to the resistor R1 and the capacitor C1, and the determined time elapses. Then, transistor Q1 is turned on again.

Next, when the light switch LSW, ignition switch IGSW and heater switch H8W are turned on and the operation switch O8W is turned off, the ignition switch IGSWk is turned off.The circuit of the embodiment shown in FIG. 2 will be explained below. It makes a sound like that.

In other words, the voltage due to the back electromotive force generated by the energy of the heater promotor M1 is marked on the load side line of the ignition switch IGSW, but the voltage increases exponentially from the voltage applied to the battery B. The voltage begins to drop 4, and the voltage of the power supply line 13 also decreases accordingly.

However, since the transistor Q3 is off because the operating switch O8W is off, the voltage at the collector of the transistor Q3 is at the voltage of the power supply line 12.

Therefore, the voltage at point a, which is connected to the collector of transistor Q3 via resistor RIO button and diode D5, does not change, and transistor Q1't is not turned off.

Even if the ignition switch IGSWk is turned off, the headlamp cleaner motor M3 will not operate erroneously.

As is clear from the above description, according to the present invention, the switching circuit is biased so that it is turned on when the operating switch is on and kept off when the operating switch is off, without using complicated means. With a simple circuit configuration, the relay drive circuit that operates the headlamp cleaner motor can be kept in a constant off state, so even if back electromotive force is supplied from the heater lower motor, etc., the headlamp cleaner control circuit will not malfunction. The effect on the actual medium is extremely dog-like, as it eliminates the noise and can enhance its reliability sound.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing one side sound of a conventional headlamp cleaner control circuit, and FIG. 2 is a circuit diagram showing a fourth embodiment of a headlamp cleaner control circuit according to the present invention. IGSW・・・Ignition switch f,,LS
W...Light switch, O8W...Operation switch, 01-03...Transistor%
R1tR7~RIO...Resistance, C4...
・Capacitor, D4, D5...Diode, M3...Headlamp cleaner motor.

Claims (1)

[Scope of utility model registration request] A CR time constant circuit consisting of a series connection circuit of a first resistor and a capacitor, a first transistor connected to the CR time constant circuit, and a headlamp cleaner motor connected in series to the first transistor. An ignition switch in a headlamp cleaner control circuit comprising a relay 1 drive circuit that controls the drive time of the relay based on the discharge of the CR time constant circuit consisting of a second transistor that provides a constant load for the entire relay; Connection of the second and third resistors connected in series between the positive terminal side of the fully-operated power supply and the negative terminal side of the power supply via the operation switch, and the second resistor and third resistor of the first diode. The base is connected to the point, the collector is connected to the first resistor of the CR time constant circuit connected to the positive side of the power supply via the light switch 4 via the fourth resistor, and the collector is connected to the second diode and the fourth resistor. The third transistor is connected to the capacitor of the CR time constant circuit through a gold resistor in series with the resistor, and has an emitter connected to the negative electrode side of the power supply through the first diode and the operating switch in series. A headlamp cleaner control circuit entirely characterized by a switching circuit that is turned on when an operating switch is on and held off when the operating switch is off.