JPS6144912Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an intermittent wiper circuit that has a small number of parts and can be miniaturized.

Conventionally, intermittent wiper circuits have either combined a Schmitts circuit with a time constant or a monostable circuit, but both require two active elements, and as a result, the resistance, diode, etc. are needed in large numbers. For example, a Schmitt circuit usually couples two transistor emitters and applies current feedback, so neither of these two transistors can drive the wiper motor or the relay that drives it. , one more driving transistor is required, making the circuit configuration complicated, making it difficult to downsize, making it difficult to reduce the weight of the entire system, and making it expensive.

The present invention does not have such drawbacks of the conventional ones, and by simplifying the circuit configuration, it improves the functionality of the entire system while reducing its weight and size, and provides a built-in intermittent wiper circuit in a cell such as a wiper switch. The purpose is to

Next, the present invention will be explained in detail with reference to the drawings in accordance with embodiments.

Figure 1 shows an intermittent wiper control circuit linked to a washer for a wiper motor in which the wiper motor ON/OFF switch is on the + side of the power supply, and an example of its connection. In the figure, the wiper mode switch is shown by its terminal connection table Q, and the circuit of the present invention is shown within the dotted line frame. First, connection table Q
Explain. The horizontal column T indicates the terminal code, H is the high speed terminal Hi of the wiper motor _M1 , L is also the low speed terminal Lo, S is the common side terminal c of the relay contact 2, and B is the positive terminal of the DC current Ba. , P is the anode of the diode 5, I is the connection point 6A between the capacitor 8 and the resistor 6, W and WE are the contacts of the washer switch (not shown), and W is the washer motor M ₂
WE is connected to the negative input terminal of
and terminal WE are connected or disconnected regardless of the mode switching described below. The vertical column MOD indicates the mode switching status, and when the mode is OFF, the wipe (not shown) does not operate unless the washer switch is turned on, and terminals L and S are connected, and similarly, when the mode is INT, the wipe (not shown) is not activated. Terminal L and terminal S and terminal P and terminal I are connected, and the wiper operates intermittently. Similarly, in mode Lo, terminals L and B are connected and the wiper operates at low speed. In mode Hi, terminal H and terminal B are connected and the wiper operates at high speed. Next, the washer-linked intermittent wiper circuit, which is the main part of the present invention, will be explained. The collector of the transistor 1 is connected to the positive terminal of the DC power supply Ba through a parallel circuit consisting of a relay coil 3 that drives the contact 2 and a resistor 4, and its emitter is grounded.
The relay coil 3 is controlled by ON and OFF, and the relay contact 2 is switched between the operating side a and the brake side b. auto stop switch
So turns on and off in conjunction with the wiper movement, and during its operation, the common side terminal c' is the positive terminal of the DC power supply Ba.
Wiper motor M ₁ is connected to a′ and rotates continuously, and the common side terminal c′ is connected to the ground side terminal in the fixed position.
b', and when the relay contact 2 is in the OFF state, the input terminals of the wiper motor _M1 are short-circuited, and the wiper motor _M1 is rapidly stopped. The anode of the diode 5 is connected to the terminal P, the positive voltage of the DC power supply Ba is applied to the terminal I and the capacitor 8 through the resistor 6, and the other terminal of the capacitor 8 is connected to the auto-stop switch So through the resistor 7. Connected to common side terminal c′. The cathode of the diode 9 is connected to the negative terminal of the washer motor _M2 and the terminal W. The emitter of the transistor 10 is connected to the positive terminal of the DC power supply Ba, and the collector thereof is connected to the cathode of the diode 5 as well as the resistors 14 and 1.
It is grounded through a series circuit of 5. resistance 14
The connection point between the resistor 15 and the resistor 15 is connected to the base of the transistor 1. The base of the transistor 10 is connected to the connection point A of the resistor 11 and the resistor 12, and the positive voltage of the DC power supply Ba is connected to the resistor 11, the resistor 12, and the resistor 1.
6, a diode 9, and a wash motor _M2 . capacitor 1
3 is connected in parallel to a series circuit consisting of a resistor 11 and a resistor 12.

To explain the operation of this embodiment configured as above, the wiper mode switch
When the watch switch is OFF, terminals W and WE are open, and as a result, the base of the transistor 10 is at a high potential.
is OFF and the anode of diode 5 is floating, so the base of transistor 1 is connected to resistor 1.
5 makes the transistor 1 a ground potential.
OFF, relay coil 3 is de-energized, relay contact 2
is OFF, so terminals C and B are connected, the rotor of wiper motor _M1 is short-circuited via auto-stop switch So, contacts L and S, and is disconnected from DC power supply Ba, so the wiper is not operated. It is in a stopped state.

Next, if only the wiper mode switch is set to mode INT, the wiper will operate intermittently. That is, contact P
and contact I, contact L and contact S are connected, respectively,
A current flows to the base of the transistor 1 through the positive electrode of the DC power supply Ba, the resistor 6, the diode 5, and the resistor 14, and the transistor 1 is turned on (assuming that the capacitor 8 is in a charged state in this case). Therefore, the terminals c and a of the relay contact 2 are connected, and the low-speed rotation operation circuit of the wiper motor _M1 is closed, and the wiper starts low-speed operation.At the same time, the common side terminal c' of the auto-stop switch So is connected to the DC current. Power supply Ba
The charge of the capacitor 8 is discharged. When the wiper makes one reciprocation and returns to its home position, the auto stop switch So switches terminal c' to terminal
b', the terminal of the capacitor 8 becomes ground potential, the potential of the base of the transistor 1 decreases and the transistor 1 is turned off, the terminal c of the relay contact 2 is connected to the terminal b, and the wiper motor is rapidly stopped. is stopped at a fixed position. On the other hand, the capacitor 8 is charged again with a time constant determined by the resistance values of the resistors 6 and 7 and the capacitance of the capacitor 8 from the time when the auto-stop switch So is connected to the ground side, and after a certain period of time, the transistor 1 is made conductive and the relay coil 3 is charged. The above operation is repeated intermittently by passing a current through. That is, the wiper is operated at intervals of a time constant determined by the capacitance of the capacitor 8 and the resistors 6 and 7. Next, set the wiper mode switch to
When set to Lo, terminals L and B are connected, resulting in the same circuit configuration as when relay contact 2 was always operating in the case of mode INT, and the wiper continues to operate at low speed regardless of the circuit of transistors 1 and 10. , when the mode is set to OFF, the auto stop switch So, terminal L, terminal S, and relay contact 2
The wiper stops when it returns to its home position due to the circuit formed by terminals b and c. Similarly, when the mode is Hi, the wiper continues to operate at high speed due to the connection between terminals H and B, and when the mode is turned OFF, the wiper stops at its normal position.

Next, when the wiper mode switch mode is OFF and the watch switch is turned ON, terminals W and WE are connected, the cathode side of diode 9 is grounded, and capacitor 13 is charged via resistor 16 and diode 9. start. Therefore resistance 1
Connection point A of 1 and 12, that is, transistor 10
The base potential of capacitor 13 and resistor 16
The base current of the transistor 10 starts to flow after a certain period of time (for example, 0.5 seconds). As a result, the collector current of transistor 10 is supplied to the base of transistor 1, relay contact 2 is made, and wiper motor _M1 begins to rotate at a low speed, and the wiper continues to operate until the washer switch is turned off in the same manner as described above. In this case, the watch switch
By turning off, the cathode side of the diode 9 becomes open, and the base current of the transistor 10 continues to be supplied from the capacitor 13 via the resistor 12. However, the potential of the base of the transistor 10, that is, the connection point A, increases with a time constant determined by the resistor 12 and the capacitor 13, and at a certain potential, the transistor 10 can no longer supply sufficient base current to the transistor 1, and the transistor 1 turns OFF. Then, the relay contact 2 switches to the terminal b side, and the wiper motor _M1 quickly stops at the wiper's normal position. In other words, the wiper motor M1 moves slowly with a time constant determined by the resistor 16 and the capacitor 13, and the wiper motor _M1 moves slowly during the time constant determined by the resistor 12 and the capacitor 13.
_M1 continues to rotate even after the washer switch is turned off. Next, when the wiper mode switch is in mode INT, turn on the washer switch and after a certain period of time
If it is turned off, only the above-mentioned washer switch should be turned on.
After performing the same wiper operation as when turning ON and OFF, the same operation as in mode INT continues. When the wiper mode switch is in mode Lo or mode Hi, the wiper operates in that mode regardless of whether the washer switch is ON or OFF.

FIG. 2 shows another embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same parts. The one in Figure 2 is of a type in which the wiper motor ON/OFF switch is on the ground side.The difference from Figure 1 is that in the connection table Q, in the case of mode INT, terminals I and B are connected, and terminal I is connected to the emitter of transistor 1, a relay coil 3 and its parallel resistor 4 are connected between the collectors of transistors 1 and 10 as a common load to ground, and the base of transistor 1 is connected to ground and an auto-stop switch.
A potential determined by a time constant circuit consisting of a resistor 6, a capacitor 8, and a resistor 7 connected in series with the common side terminal c' of So is applied via a diode 5. Further, the base of the transistor 1 is biased to the positive side by a resistor 17. Also, relay contact 2 turns the drive voltage of wiper motor _M1 ON and OFF.
and auto-stop switch So are on the ground side with respect to wiper motor _M1 . The operation of this circuit is the same as that shown in Fig. 1, but by turning on and off the connection of the collector current of transistor 1 with the power supply side between terminals I and B of the wiper mode switch, relay coil 3 The difference is that it controls the

FIG. 3 shows still another embodiment, in which the same reference numerals as in FIG. 2 indicate the same components, and in FIG. 4, transistors 1 and 10 in FIG. Therefore, in addition to the diode 5 connected to the base of the transistor 21, the diode 2 is also used.
2 to the base of transistor 21, and by connecting this to two time constant circuits consisting of resistors 11, 12, 16 and capacitor 13,
The operation and effect are exactly the same as in the case of FIG. 2.
In this case, the grounding side resistor 6 of the time constant circuit consisting of the capacitor 8 and the resistor 6 is replaced by the newly installed resistor 2.
After stopping the intermittent operation by 3, capacitor 8
The electric charge remaining in the engine is quickly discharged so that intermittent restarts can be performed quickly. In the figure, the DC voltage power supply Ba is the ON/OFF state of the power switch IG.
It is carried out by.

The common feature of the above four embodiments is that one operating time of the wiper motor _M1 (the time it takes for the wiper to start from the home position and return to the home position) is the time constant of one of the unstable multivibrators, and its auto-stop switch So. is one active switch, the other time constant is determined by this and a set of resistor 6 and capacitor ₈ , and the other active switch (relay contact 2,
The wiper is operated intermittently using an unstable multivibrator configuration consisting of transistor 1 and transistors 10 and 21), and when the washer is activated, the wiper is activated after a time period determined by the capacitor 13 and resistor 16 has elapsed. After starting and stopping the washer, capacitor 13 and resistor 1
The wiper operation continues and stops for a time period determined by 2. In addition, in this embodiment, the above-mentioned rest time is required by making part or all of the resistor 6 variable among the first resistor 6 and the first capacitor 8 that determine the rest time of the intermittent wiper. This can be changed arbitrarily depending on the situation.

As described above, according to the present invention, by considering the intermittent wiper control circuit as an unstable multivibrator composed of a wiper drive circuit and a switching circuit with a time constant determined by a capacitor and a resistor, a time constant circuit and a It has a configuration that allows the switching circuit to be shared, and therefore has a very small number of parts and can be easily made compact and can be built directly into a wiper switch, etc., which simplifies the wiring harness and improves the system. It is also possible to reduce the overall weight.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of one embodiment of the present invention, FIG. 2 is a circuit diagram of another embodiment, and FIG. 3 is a circuit diagram of still another embodiment. 1...Transistor, 2...Relay contact, 3...
... Relay coil, 6, 7 ... Resistor, 8 ... Capacitor, 10 ... Transistor, 11, 12 ... Resistor, 13 ... Capacitor, M ₁ ... Wiper motor, M ₂ ... Washer motor, Q ... Between terminals Connection table, So...Auto stop switch.

Claims (1)

[Scope of utility model registration request] In a wiper motor having an auto-stop switch for stopping the wiper at a fixed position, the fixed contact of the auto-stop switch, which closes when the wiper stops at a fixed position, and one terminal of the wiper motor are connected to one side of the power supply, and The other terminal of the wiper motor is connected to the common point of the relay contact via the wiper switch, and the fixed contact of the auto-stop switch, which closes when the wiper is in a position other than the stop position, and the normally open contact of the relay contact are connected to the other side of the power supply. ,
In addition, the normally closed contact of the relay contact and the common contact of the auto-stop switch are connected to one end of a capacitor that determines the rest time of the intermittent wiper, and the other end of this capacitor is connected to one end of a resistor that forms a time constant circuit together with the capacitor. and one end of the coil of the relay is connected to the collector of the transistor, the other end is connected to the normally open contact of the relay contact along with the other end of the resistor, and the emitter of the transistor is connected to one side of the power supply, and the base is connected to the collector of the transistor. A wiper circuit characterized in that the wiper circuit is connected to the resistor directly or via a wiper switch.