JPS6052013B2 - Wiper motor control device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wiper motor control device.

Conventionally, in times of light rain such as drizzle, the operation of the wiper motor was controlled intermittently by charging and discharging a capacitor in order to eliminate the hassle of frequently opening and closing the wiper switch and to reduce the load on the wiper motor. It has been known.

In order to be able to use the wipers at any time, the capacitor is charged when the ignition switch is turned on, but conventionally the charging voltage of the capacitor has been insufficiently controlled and Because it is configured to charge and discharge at a desired voltage, it has the disadvantage that the initial period of intermittent wiper operation is unstable and the intermittent rest time fluctuates depending on the length of time between turning on the ignition switch and turning on the wiper operation switch. . In addition, in the case of conventional intermittent operating devices, relatively large currents such as washers motors were directly opened and closed, so in order to prevent malfunctions and protect the control circuit consisting of electronic parts from the pulses of the motor etc.
This method has the drawback that a resistor with a sufficient resistance value cannot be used, and a diode and capacitor of relatively large capacity are required. The first invention aims to provide a stable intermittent pause time from the initial stage of intermittent operation, and includes a wiper motor for driving wiper blades, a relay coil having a start switch thereof, and a relay coil interlocked with the wiper motor. It includes a fixed position stop switch that stops the wiper blade at the fixed position when the coil is not activated, an operation switch, and a control circuit having a first capacitor, and the control circuit includes an intermittently activated position of the operation switch. a second charging circuit that slowly charges the capacitor; and a first charging circuit that slowly discharges the capacitor upon completion of charging.
a discharge circuit, and a relay circuit that connects the relay coil that is closed during discharge to a power source, and that quickly charges the first capacitor only when the operation switch is in a non-operation position. It is characterized by having the following. The second invention further quickly charges the first capacitor to a high voltage, and after the washer liquid is ejected, the wiper blade is given a plurality of consecutive reciprocations to ensure that the wiped surface is sufficiently wiped at all times. This is a wiper for driving wiper blades. a motor, a relay coil having a start switch thereof, and a fixed position stop switch that is interlocked with the wiper motor and stops the wiper blade in the fixed position when the relay coil is not activated;
The control circuit includes an operating switch and a control circuit having a first capacitor, and the control circuit includes a first charging circuit that quickly charges the first capacitor to a relatively low voltage only when the operating switch is in the non-operating position. , a first discharging circuit that slowly discharges the first capacitor when the operation switch is in an intermittent operating position; and a second charging circuit that slowly charges the first capacitor to the original voltage upon completion of the discharging; a second capacitor that is quickly charged in a position other than the washer position of the operating switch; The second discharge circuit is provided with a second discharge circuit that discharges at a slow speed only in the washer position, and a third detection element that closes the relay circuit upon completion of the discharge, and is driven only in the washer position of the operation switch. a washer motor, and a first charging circuit for the first capacitor further includes a first switch element that charges the first capacitor to a relatively low voltage when the operating switch is in a non-operated position; The sixth switch element is charged to a relatively high voltage when the operating switch is in the washer position. Next, embodiments of the present invention will be described with reference to the attached drawings. In the drawings, reference numeral 1 indicates a wiper motor for driving wiper blades.

Reference numeral 2 indicates a rise-up relay having switches 2A and 2B. This relay 2 is a conventionally known one, and is used to rotate the wiper motor 1 in the normal direction to make the wiper motor 1 reciprocate and to stop the wiper blade. It is used to reverse the wiper motor 1 and move the wiper blade from its normal wiping angle to a lower stowed position so as not to obstruct the field of view.

3 indicates a power source for a control device for the wiper motor 1.

4A and 4B are start switches (described in detail later) that are switched by the operation of the relay coil 4.

) is shown. Relay coil 4 is used to operate the wiper blade intermittently. Reference numeral 5 indicates a fixed position stop switch for stopping the wiper blade at a fixed position.
It has a structure as described in Publication No. 44.

Reference numeral 6 indicates a control circuit that controls the relay coil 4.

8 is an operation switch, shown in detail.

The control circuit 6 has a first capacitor 9, which is connected to a first charging circuit 11 that is quickly charged via a first switch element 10 which is conductive only in the non-operated position A of the operating switch 8. and a second charging circuit 13 that is slowly charged via a resistor 12 in the intermittent operating position B of the operation switch 8;
The first discharging circuit 15 is provided with a first discharging circuit 15 that is slowly discharged via a switch element 14, and when the charging potential of the capacitor 9 rises to a predetermined potential V1, the first discharging circuit 15 detects this and The second switch element 14 is made conductive and discharged to a predetermined potential V.

A first detection element 16 is provided which detects this and makes the second switch element 14 non-conductive when the second switch element 14 falls. Further, the second switch element 14 intervenes in a relay circuit 17 that connects the relay coil 4 to the power source 3.

The first switch element 10 consists of one transistor,
The collector and emitter are connected to the first charging circuit 11, and the base is connected to the power source 3 via a resistor 18. The second switch element 14 includes two transistors 14
The emitter of the transistor 14a at the front stage is connected to the base of the transistor 14b at the rear stage, and the collector of the transistor 14a at the front stage and the emitter of the transistor 14b at the rear stage intervene in the first discharge circuit 15. A relay circuit 17 is inserted between the collector and emitter of the transistor 14b. The first detection element 16 is composed of two transistors 16a and 16b forming a Schmitt circuit, and the base 16a'' of one of the transistors 16a is connected to the first detection element 16 through a resistor 19.
It is connected to a connection circuit between the switch element 10 and the first capacitor 9, and its collector is connected to the power supply 3 and connected to the base of the transistor 14a in the previous stage of the second switch element 14 via two transistors 20 and 21. Connected.

Further, the base 16a'' of one transistor 16a is connected to a third switch element 23 consisting of a resistor 22 and a transistor.
grounded through.

The other transistor 16b has its base connected to the base of the transistor constituting the first switch element 10 and connected via a resistor to the base of the transistor constituting the third switch element 23 and the fifth switch element 2 to be described later.
It was connected to the collector of the transistor constituting 7.

Furthermore, the emitters of both transistors 16a and 16b were connected in common and connected to the base of the third switching element 23 via a resistor. Next, to explain its operation, FIG. 1 shows that when the operation switch 8 is in the non-operation position A and the ignition switch (not shown) is turned on, the first switch element 10
A voltage is applied to the base of the main transistor through the resistor 18, the first switch element 10 is kept conductive, and the third switch element 23 is conductive, as indicated by the arrow 1 in FIG.
The first charging circuit 11 is configured as shown in , and the first capacitor 9 starts to be quickly charged.

At this time, in the Schmitt circuit constituting the first detection element 16, one transistor 16a remains non-conductive and the other transistor 16b maintains conduction.

The first capacitor 9 is controlled by the base potential of the transistor constituting the first switch element 10, and is charged to a predetermined potential V1 (for example, 3.8 V) for causing the wiper to perform predetermined intermittent operation. [Figure 2a]. At this time,
As shown by the arrow ■ in FIG. 1, the voltage from the power supply 3 is applied via the rise-up relay 2 and the diode 25 to the fourth switch element 26 made of a transistor, and the fourth switch 26 is maintained in a conductive state. .

Therefore, the fifth switch element 27 consisting of a transistor connected to the output terminal of the fourth switch 26 maintains non-conduction, and therefore, as described above, in the Schmitt circuit serving as the first detection element 16, the transistor 16a is non-conductive and the transistor 16b maintains conduction, and the third switch element 23 maintains conduction. In this case, almost no current flows through the rise-up relay 2, the rise-up relay 2 is maintained in an inactive state, the relay coil 4 is inactive, and the start switches 4A and 4B are turned off as shown in the first figure. , and the fixed position stop switch 5 is in the lower position.
Wiper motor 1 does not rotate.

Next, when the operation switch 8 is switched to the intermittent operating position B as shown in the third diagram, the anode of the diode 25 falls to the ground, the fourth switch element 26 becomes non-conductive, and the fifth switch element 27 becomes conductive.

Therefore, the first switch element 10 and the third switch element 2
3 becomes non-conductive because the base potential drops, and the emitter potential of the transistor 16a of the first detection element 16 also drops, so the transistor 16a becomes conductive and the other transistor 16b becomes non-conductive.

Thus, the second switch element 14 becomes conductive via the transistors 20, 20, and the first discharge circuit 15 and relay circuit 17 are closed as shown by the arrows ■ and ■ in FIG.
The first capacitor 9 includes a resistor 28, a diode 29 and a second capacitor 9.
A discharge occurs through the switch element 14 (FIG. 2a), and the relay coil 4 is actuated to close the starting switches 4A, 4B. Also, as a current flows through the rise-up relay 2 as shown by the arrow V in FIG. The wiper motor 1 rotates.

The first capacitor 9 is discharged with a relatively large time constant determined by the resistor 28 as shown in FIG. 2a.

Due to the discharge, the potential of the first capacitor 9 drops and the potential of the second capacitor 9 decreases.
As shown in Figure a, the predetermined voltage V after time T1 has elapsed. , for example, when the voltage reaches 3V, the transistor 1 of the first detection element 16
6a becomes non-conductive, and the transistors 20 and 21 become non-conductive, so that the potential of the collector of the transistor 21 increases, and the other transistor 16b becomes conductive. At this time, the rise in the collector potential of the transistor 21 is the first
It does not rise to the extent that the switching element 10 becomes conductive.

In this way, the second switch element 14 becomes non-conductive due to the non-conduction of the transistor 20, the first discharge circuit 15 and the relay circuit 17 are cut off, and the starting switches 4A, 4B return to their old states as shown in FIG. As shown by the arrow ■, current still flows through the wiper motor 1 and its rotation continues, and at the same time, as shown by the arrow ■, the second charging circuit 13
is closed and charging of the first capacitor 9 is started.

Discharge time T1 of the first capacitor 9 described above [Fig. 2 a]
In this case, the relay coil 4 is activated as shown in FIG. 2b. The time should be shorter than the time T (Fig. 2C) for completing one reciprocation of the wiper blade, and the start switch 4A, 4
Even after B has returned to its old position, the circuit shown by the arrow ■ in FIG. 5 is configured as described above, so that rotation is applied to the wiper motor 1 for a time T as shown in FIG. 2C.

That is, when the wiper motor 1 maintains rotation according to the circuit configuration shown by the arrow ■ in FIG. A closed circuit shown by the arrow ■ in the figure is formed, and the wiper motor 1 suddenly stops. 1st capacitor 9
is charged with a time constant determined by the resistor 12 of the second charging circuit 13 from the time Q (FIG. 2a) when the discharge is completed, and when the predetermined potential V1 is reached after the elapse of time T2, the transistor 16a of the first detection element 16 becomes conductive. Accordingly, the transistor 16
b becomes non-conductive, the second switch element 14 becomes conductive, the first discharge circuit 15 and the relay circuit 17 are closed, and the above-described operation is repeated.

Next, when the operating switch 8 during rotation of the wiper motor 1 is switched to the non-operating position A, the capacitor 9 is discharged to a predetermined potential ■.

Relay coil 4 is energized until reaching . Next, a predetermined potential ■. When reaching , relay coil 4 becomes inactive,
The start switches 4A and 4B are opened to restore the old state, but until the wiper blade reaches a predetermined stop position and the fixed position stop switch 5 is switched up, the rise-up relay 2 switches 2B1 and 30. The wiper motor 1 is grounded and continues to be energized via the fixed position stop switch 5 located at the lower position, and current flows through the wiper motor 1 as shown by the arrow ■ in FIG. 7 to continue its rotation. Next, when the wiper blade reaches the stop position, the fixed position stop switch 5 is switched upward, a closed circuit is formed as shown by the arrow ■ in FIG. 8, and the wiper motor 1 is suddenly stopped. Rise-up relay 2 then becomes inactive. In this way, a current flows in the opposite direction to the wiper motor 1 as shown by the arrow x in FIG. A closed circuit is formed as shown by XIV, and the wiper motor 1J suddenly stops. During this reversal, the wiper blade is moved to the stowed position by a conventionally known linkage device. 10W of operation switch 8, HIGH position C,
When switching to D, the control circuit 6 is left unrelated;
The wiper motor 1 rotates continuously at low and high speeds, and there is no difference from the reciprocating operation of wiper blades commonly used in the past.

In FIG. 11, 20 indicates a second capacitor, and the capacitor 40 is connected to a third charging circuit 41 which is charged in the operating position A of the operating switch 8, and a second discharge which is discharged via a resistor 42 in the washer position E. It is connected to the circuit 43.

Reference numeral 44 indicates a washer motor for driving the washer pump, which is grounded at the washer position E of the operation switch 8.

One end of the second capacitor 40 is connected to the control pole 46a of the third detection element 46 via a resistor 45, and the third detection element 46
6 intervened in a circuit that grounded the control pole 47a1, ie, the base, of the sixth switch element 47, which was a transistor connected in parallel to the first switch element 10.

The third detection element 46 includes two transistors 46A, 46.
The transistor 46A in the previous stage is the control pole 46a.
1, that is, the base is connected to the second capacitor 40, the collector is connected to the base of the sixth switching element 47, and the emitter is connected to the base of the subsequent transistor 46B.
The transistor 46B in the latter stage has its collector and emitter connected to a circuit that grounds the base of the seventh switching element 46, which is a transistor provided in parallel with the fifth switching element 27. Thus, in the non-operating position A of the operation switch 8 as shown in Figure 11, the third charging circuit 41 is configured as shown by arrow XV, and the second capacitor 40 is connected to V2O as shown in Figure 12C. When charged, the third detection element 46 is in a conductive state, the sixth switch 47 is in a non-conductive state, the first switch element 10 is in a conductive state as described above with respect to FIG. The first capacitor 9 is charged to a voltage V1 regulated by the first switching element 10 [FIG. 12b].

Next, when the operation switch 8 is switched to the washer position E, the second capacitor 40 closes the second discharge circuit 43 shown by arrow XVI in FIG. will be carried out.

Thus, when the potential of the second capacitor 40 drops to a predetermined potential VlO due to discharge, as shown in FIG.
The detection element 46 becomes non-conductive.

Therefore, the potential of the control pole 47a of the sixth switch element 47 and the base potential of the transistor serving as the seventh switch element 48 both rise, and the sixth switch element 47 and the seventh switch element 48 become conductive. According to the conduction of the seventh switch element 48, both the base potential of the transistor serving as the third switch element 23 and the base potential of the first switch element 10 drop, and the base potential of the transistor serving as the third switch element 23 and the base potential of the first switch element 10 drop.
becomes non-conductive, and the transistor 16 of the first detection element 16
The base potential of transistor 16a rises, and transistor 16a becomes conductive. Thus, the second switch element 14 becomes conductive via the transistors 20 and 21.

Therefore, the first and second charging circuits 11 and 13 and the first discharging circuit 1
5 is closed, but the resistor 4 that intervened in the first charging circuit 11
9 is a resistor 12 of the second charging circuit 13 and the first discharging circuit 15
, 28 (for example, 1KΩ: 680KΩ:
18KΩ), so substantially only the sixth switch element 47 of the first charging circuit 11 is closed and the first capacitor 9 is quickly charged. Since the base of element 47 is not controlled, its charging potential is a relatively high voltage V regulated by Zener diode 24, as shown in FIG. 12b.
2 (for example, 7V). Second switch element 14
When conduction occurs, the relay coil 4 is activated and the starting switches 4A, 4B are closed, as in the case of the intermittent operation described above. Therefore, the other end of the rise-up relay 2, whose one end is connected to the power supply 3, is grounded via the closed start switches 4B and 4A, and becomes activated.
A, 2B are switched downward. Therefore, the wiper motor 1 has a power supply 3, a switch 2A1, a wiper motor 1,
The wiper blade is rotated by a closed circuit of the operation switch 8 and the start switch 4A1 grounded, and reciprocating motion is given to the wiper blade. That is, the wiper motor 1 starts to operate the second capacitor 40 from the time TlA when the operating switch 8 is switched to the washer position E.
is discharged and the third detection element 46 becomes non-conductive
The operation is started after a delay of time TIO 2 [FIG. 12C, d].

The washer motor 44 operates from time t1 when the operating switch 8 is switched to the washer position E, and continues for a time T until the time when the operating switch 8 is switched to the non-operating device A.

O is activated (Fig. 12a), and the washer liquid is ejected. The relatively high charging potential V2 of the first capacitor 9 starts discharging at the time T3 when the operating switch 8 is returned from the washer position E to the non-operating position A, as shown in FIG. 2b.

That is, when the operating switch 8 is returned to the non-operating position A, the second capacitor 40 is recharged as shown in FIG.
The potential at the base of the transistor serving as the detection element 46 rises, the third detection element 46 becomes conductive, and the potential at the base of the transistor serving as the sixth switch element 47 falls, the sixth switch element 47 becomes non-conductive, and the seventh The potential at the base of the transistor serving as the switch 48 drops, and the seventh switch 48
becomes non-conductive, but since the eighth switch element 50, which is a transistor provided in parallel with the seventh switch 48, is maintained conductive by the conduction of the transistor 21, the transistor 16a of the first detection element 16 remains conductive. As a result, the second switch element 14 is maintained conductive (FIG. 12d). Thus, as shown in FIG. 12b, the first capacitor 9 is discharged and its potential reaches V1 through V1.

At the time point ζ when ζ is reached, the transistor 16a of the first detection element 16 becomes non-conductive, and the operation switch 8 is switched from the intermittent operation position 8 to the non-operation position A in the intermittent operation, as shown in FIGS. After passing through the path, the wiper blade is placed in the stowed position. In this way, the wiper blade is given a plurality of consecutive reciprocating movements for the time indicated by T2O in FIG. 12e, and sufficient wiping is performed. When switching the operating switch 8 to LOW, HIGH positions C and D, the wiper motor 1 is independent of the control circuit 6.
is rotated continuously at low and high speeds. In addition, 51 is a capacitor for preventing self-oscillation of the control rotation 6, 52 and 53 are resistors and capacitors for protecting the entire control circuit 6, and 5
4 indicates a capacitor for protecting the transistor 14b of the second switch element 14.

Further, the transistor 1 constituting the second switch element 14
In order to reduce the voltage drop and increase the current flowing to the relay circuit 17 compared to the Darlington connection in which the collectors of 4a and 14b are commonly connected, each collector is separated and connected to the first discharge circuit 15 and the relay circuit 17 separately. Connected.

Furthermore, since the fifth switch element 27, the seventh switch element 48, and the eighth switch element 50 are all indirectly opened and closed, they may malfunction or be destroyed by pulses from a motor or the like. Resistors 45, 55 with low resistance values prevent and protect against this. The relationship among the wiper motor 1, fixed position stop switch 5, and rise-up relay 2 will be supplementarily explained based on FIGS. 15 and 16.

In the illustrated example, reference numeral 60 denotes a housing housing a deceleration mechanism 63 consisting of a worm 61 on the rotating shaft of the wiper motor 1 and a worm wheel 62 on the output shaft that meshes with the worm 61. A lid plate 64 is fixed on the top surface.

The wiper blade is driven via a speed reduction mechanism 63.

A first protrusion 65 is provided on the upper surface of the worm wheel 62, and a cam disk 67 is rotatably provided on the cover plate 64, and has a second protrusion 66 that projects on the rotation locus of the first protrusion 65. When the wiper motor 1 is rotated, the first
The protrusion 65 presses the second protrusion 66, and the cam disk 67 is rotated. The cam disk 67 has a central portion 67a made of a conductive material, a peripheral portion 67b made of an electrically insulating material, and a portion 67c of the peripheral portion 67b that protrudes toward the central portion 67a side made of a conductive material. The central portion 67a is provided with a second contact 69 that makes contact at its tip, and the peripheral portion is provided with a first contact 68 that makes contact at its tip. Note that the central portion 67a is grounded.

The fixed position stop switch 5 is the first stop switch of the worm wheel 62.
The protrusion 65, the second protrusion 66 of the cam disk 67, and the first and second protrusions
When compared to those shown in the circuit diagram, the upper terminal in the circuit diagram corresponds to the first contact 68, and the common terminal in the middle of the circuit diagram corresponds to the second contact 69. Corresponds to the center part 67a of the lower terminal force board 67 in the circuit diagram.
corresponds to

It is assumed that the first and second contacts 68 and 69 are fixed.

Next, the relationship between the operations of the fixed position stop switch 5 and the wiper motor 1 will be explained based on FIG. 17, including the operation of the rise-up relay 2.

During forward rotation of wiper motor 1, worm wheel 6
The force of the first protrusion 65 of the second protrusion 67 is pressed and the cam disc 67 is rotated, so even if the operation switch 8 is switched to the non-operation position A, the rise-up relay 2 For power supply 3Q rise up relay 20! >A current flows through the diode 305 in the switch 2B and the ground in the fixed position stop device 5, and the rotation continues, and the cam disk 67
As shown in Figure 7a, the rotation continues in the direction of the arrow.

Then, as shown in FIG. 17b, when the protruding portion 67c contacts the first and second contacts 68 and 69, the first and second contacts 68 and 69 are connected to the power source 3, and the fixed position stop switch 5 has been switched to the upper side as shown in FIG. A current flows as shown by the arrow x■ in FIG. 9, and reverse rotation begins as shown in FIG. 17C.

At the beginning of this reversal, the engagement between the first protrusion 65 and the second protrusion 66 is released, so the cam disc 67 does not rotate, and when the worm wheel 62 rotates once, the first protrusion 65 returns to the previous position. engages with the second protrusion 66 from the opposite direction, and when the wiper motor 1 further rotates and the first protrusion 65 presses the second protrusion 66, the protruding portion of the cam disk 67 as shown in FIG. 6
7c is removed from the first and second contacts 68 and 69, and the fixed position stop switch 5 is switched to the lower side as shown in FIG. 10, forming a circuit shown by arrow XIV in FIG. Then, wiper motor 1 suddenly stops. Incidentally, the wiper blade is stored while the wiper motor 1 is in reverse rotation, for example, by a link device described in Japanese Utility Model Publication No. 44-17930.

FIG. 14 shows another embodiment in which the rise-up relay 2 and its switches 2A and 2B are removed. When the operating switch 8 is switched to the non-operating position A, the wiper motor 1 is suddenly stopped when the wiper blade comes to the normal position and the normal position stop switch 5 is switched upward.

In this example, when the operating switch 8 is switched to the 10W, HIGH position C or D, the control circuit 6 is inactive.

There is no difference from the previous embodiment in other respects.

As described above, the first invention includes a controlled first charging circuit that quickly charges the first capacitor to a predetermined voltage only when the operation switch is in the non-operated position.
The capacitor is immediately charged to a relatively low predetermined voltage when the ignition switch is turned on, and even if the operation switch is switched to the intermittent operation position at any time, the wiper motor is automatically activated from the beginning in the normal intermittent operation, that is, every time the wiper blade makes one reciprocation. The first charging circuit is provided with a sixth switch element that is given a predetermined rest time and that, in accordance with the second invention, quickly charges the first capacitor to a relatively high predetermined voltage only when the operating switch is in the washer position. Therefore, even when the washer is operated frequently, the wiper blade can be repeatedly reciprocated several times after the washer liquid is ejected, so that sufficient wiping of the wiping surface can be ensured at all times.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of one example of implementing the present invention, FIG.
Figure 2 is a diagram explaining the operation of each part, Figures 3 to 11 and 13 are circuit diagrams explaining the operating state, Figure 14 is a circuit diagram of another embodiment, and Figures 15 to 17. The figure is a supplementary explanatory diagram of the present invention. 1...Wiper motor, 4...Relay coil, 4
A, 4B... Start switch, 5... Fixed position stop switch, 6... Control circuit, 8... Operation switch, 9...
...First capacitor, 10...First switch element, 1
1... First charging circuit, 13... Second charging circuit, 15
...First discharge circuit, 17...Relay circuit, 40...
-Second capacitor, 43...Second discharge circuit, 44...
- Washer motor, 47...6th switch element, 46...3rd detection element, 50...8th switch element.

Claims (1)

[Scope of Claims] 1. A wiper motor for driving a wiper blade, a relay coil having a start switch thereof, and a fixed position stop that is linked to the wiper motor and stops the wiper blade at a fixed position when the relay coil is not activated. It consists of a switch, an operation switch, and a control circuit having a first capacitor, and the control circuit includes a second charging circuit that slowly charges the capacitor when the operation switch is in the intermittent operating position, and a second charging circuit that slowly charges the capacitor. and a first discharging circuit that slowly discharges the coil upon completion of the discharge, and a relay circuit that connects the relay coil to a power source, which is closed at the time of discharging, and only when the operation switch is in the non-operated position. A wiper motor control device comprising a first charging circuit in which a first capacitor is quickly charged. 2. A wiper motor for driving a wiper blade, a relay coil having a start switch thereof, a fixed position stop switch that is linked to the wiper motor and stops the wiper blade at a fixed position when the relay coil is not activated, and an operation switch. , a control circuit having a first capacitor, the control circuit including a first charging circuit that quickly charges the first capacitor to a relatively low voltage only when the operating switch is in a non-operating position; A first discharging circuit that slowly discharges the first capacitor in an intermittent operation position, and a second charging circuit that slowly charges the first capacitor to the original voltage as the discharge is completed, and the second charging circuit is closed when discharging. and a second capacitor that is quickly charged at a position other than the washer position of the operating switch, the second capacitor being charged only at the washer position of the operating switch. , a second discharge circuit that discharges at a slow speed, a third detection element that closes the relay circuit upon completion of the discharge, and a washer that is driven only when the operation switch is in the washer position. The first charging circuit for the first capacitor further includes a first switch element that charges the first capacitor to the above-mentioned relatively low voltage when the operating switch is in a non-operating position; A wiper motor control device comprising: a sixth switch element that is charged to a relatively high voltage in the washer position.