JP2002283966A - Wiper control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper control device capable of automatically and delicately changing an operation mode of a wiper according to rainfall. SOLUTION: This wiper control device 1 has an operation decision means for controlling an output circuit 10 so as to make a wiper motor 4 perform a high speed continuous operation when intermittent time corrected by an arithmetic means is below a first threshold value, to make the wiper motor 4 perform a low speed continuous operation when the corrected intermittent time is larger than the first threshold value and smaller than a second threshold value and to make the wiper motor 4 perform an intermittent operation by the corrected intermittent time when the corrected intermittent time is more than the second threshold value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper control device for controlling a wiper for wiping windshield glass of an automobile, and more particularly to a wiper control device with a raindrop sensor for automatically moving the wiper according to the amount of rainfall.

[0002]

2. Description of the Related Art A wiper control device of this type is known in which an electrical signal corresponding to the amount of rainfall is supplied to a controller from a raindrop sensor, and the mode of the wiper is switched by the controller.

[0003]

However, the wiper control device described above has a problem that it is difficult to change the wiper operation mode to an appropriate wiper operation mode corresponding to an irregularly changing rainfall condition.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wiper control device capable of automatically and finely changing an operation mode of a wiper according to rainfall.

[0005]

Configuration of the Invention

[0006]

According to a first aspect of the present invention, there is provided a wiper control device including a low-speed brush and a high-speed brush, wherein a first reverse position and a second reverse position on a wiping surface are provided. A wiper motor that operates the wiper blade at low or high speed in the wiping range of
A wiper switch that has a low-speed switch and a high-speed switch, respectively, and can be selectively switched, and one of a stop mode, an automatic operation mode, a low-speed operation mode, and a high-speed operation mode by selectively switching the wiper switch. A microcomputer for switching to a mode, a controller for controlling the wiper motor having an output circuit for supplying a drive signal corresponding to one of the modes to the wiper motor, and a controller mounted in the wiping range to optically detect the presence of raindrops in the wiping range. Raindrop sensor that detects an electrical signal corresponding to the raindrop, outputs an electrical signal corresponding to the raindrop, a pulse forming circuit that receives the electrical signal from the raindrop sensor, differentiates the electrical signal, shapes the waveform, and outputs it as a pulse signal, and a raindrop sensor Is input when there is no electric signal, and becomes maximum when there is no electric signal. An integrated circuit that outputs an integrated value that becomes smaller in accordance with the electric signal of the microcomputer, wherein the microcomputer outputs a pulse signal of the pulse forming circuit when the automatic operation mode is selected by turning on the automatic switch for a predetermined time. Memory means having a plurality of storage units for sequentially and individually storing, a counting means for counting the number of the plurality of storage units storing the pulse signal, and a wiper blade for wiping a predetermined area of the wiping range to which the raindrop sensor is attached. During operation of the microcomputer, a microcomputer is preset with mask means for setting a predetermined area as a mask range for prohibiting a pulse signal from being stored in a plurality of storage units, and a standard intermittent time according to the count value of the counting means. Standard intermittent time selecting means for selecting from the stored ROM table, and standard intermittent time obtained from the standard intermittent time selecting means and integration Calculating means for calculating the integral value of the road and correcting the standard intermittent time into a plurality of levels of intermittent time according to the integral value; When the corrected intermittent time is larger than the first threshold and smaller than the second threshold, the wiper motor is continuously operated at a low speed, and when the corrected intermittent time is equal to or larger than the second threshold, the corrected intermittent time is set. Operation determining means for controlling the output circuit so as to intermittently operate the wiper motor in time; and when the automatic operation mode is selected, the integral value of the integration circuit is previously determined despite no output from the pulse forming circuit. A fixed intermittent time setting means for controlling the output circuit with a predetermined fixed intermittent time when the value falls below a predetermined value. You.

In a wiper control apparatus according to a second aspect of the present invention, in addition to the configuration of the first aspect, the raindrop sensor includes a light emitting circuit having a light emitting element for generating detection light, and a light receiving element for receiving the detection light. And a detection circuit for converting the amount of light received into an electric signal, and configured to apply a feedback loop from the detection circuit to the light emitting circuit to make the amount of received light a constant value. I have.

In the wiper control device according to a third aspect of the present invention, in addition to the configuration of the first aspect, the first threshold is higher than the value when the wiper motor is switched from the low-speed continuous operation to the high-speed continuous operation. The value at the time of switching from the low-speed continuous operation to the low-speed continuous operation is set slightly larger, and the second threshold value is changed from the low-speed continuous operation to the intermittent operation than the value at the time when the wiper motor is switched from the intermittent operation to the low-speed continuous operation. It is characterized in that the value at the time of switching is set to be slightly larger and a hysteresis characteristic is provided at the time of switching.

In a wiper control device according to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the mask means is provided for a period from when the wiper blade leaves the first reverse position to when the wiper blade returns to the first reverse position. The mask range is set based on the time required, and the time is set after the movable contact of the wiper fixed position stop circuit provided in the wiper motor is separated from one fixed contact of the pair of fixed contacts and connected to the other fixed contact, It is characterized in that it is configured to take the time until it is separated from the other fixed contact and connected to one fixed contact.

In the wiper control device according to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, the movable contact of the wiper fixed position stop circuit is separated from the one fixed contact and connected to the other fixed contact in the mask means. Then, measurement is started, and when the movable contact separates from the other fixed contact and connects to one fixed contact, the measurement is terminated.The wiper fixed position stop circuit time measurement counter is provided, and the mask range is set based on the time of the counter value It is characterized in that it is configured to perform.

In the wiper control device according to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect, the mask means includes a time for all the counter values of the wiper fixed position stop circuit time measurement counter by the previous operation of the wiper blade. Mask time setting means for setting a time to reach a first predetermined value as a mask start time and setting a time to reach a second predetermined value longer than the first predetermined value as a mask end time; And a determining means for determining whether or not the time of the counter value of the wiper fixed position stop circuit time measurement counter due to the operation of the current wiper blade is between the mask start time and the mask end time. The counting means stops counting only during the time when the time is determined to be between the mask start time and the mask end time.

In a wiper control device according to a seventh aspect of the present invention, in addition to the configuration of the sixth aspect, the first predetermined value is 35% of the time of the total counter value, and the second predetermined value is the total counter value. The time is 60% of the time.

[0013]

In the wiper control device according to the present invention, the pulse signal of the pulse forming circuit to which the electric signal from the raindrop sensor is input is stored by a plurality of storage units which individually store the pulse signals sequentially for a predetermined time. The average number of raindrop signals is obtained by counting the number of the stored plurality of storage units, and this count value, that is, the standard intermittent time selected according to the average number of raindrop signals, is integrated by the integration value of the integration circuit. , The operation mode of the wiper is automatically and finely changed according to the rainfall state. In addition, while the wiper blade is operating in the predetermined area where the raindrop sensor is attached, the pulse signal of the pulse forming circuit is prohibited from being stored in the plurality of storage units. Even if raindrops adhering to the wiper blade adhere to the raindrop sensor, there is no fear that the raindrops are erroneously detected as being caused by rainfall. Further, when the automatic operation mode is selected, the intermittent operation of the wiper blade is performed with a fixed intermittent time even if the raindrop sensor fails.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

[0015]

1 to 10 show an embodiment of a wiper control device according to the present invention.

The illustrated wiper control device 1 mainly includes
It comprises a wiper switch 2, a rain sensor (raindrop sensor) 3, a wiper motor 4, and a controller 5. The controller 5 includes a power supply circuit 6, a pulse forming circuit 7, an integrating circuit 8, and a microcomputer 9 (hereinafter a microcomputer 9).
Called. ), Output circuit 10, resistors R1, R2, R3, R
4, R5, R6, R7, R8, and R9 are built-in.
In this embodiment, the pulse forming circuit 7 and the integrating circuit 8 are components of the controller 5, but the pulse forming circuit 7
The integration circuit 8 may be a component of the rain sensor 3.

The wiper switch 2 includes a stop switch (O
FF), automatic switch (AUTO), low-speed switch (L
OW), high-speed switch (HI), cleaning switch (WAS)
H) are provided. The microcomputer 9 selects the automatic operation mode when the automatic switch is turned on, and switches to the low speed operation mode when the low speed switch is turned on.
When the high-speed switch is turned on, the mode is switched to the high-speed operation mode. When the cleaning switch is turned on, the mode is switched to the cleaning operation mode. When the stop switch is turned on, the mode is switched to the stop mode. The wiper switch 2 has external connection terminals W,
I, E, L, and H are provided, respectively. The output circuit 10 controls the microcomputer 9 in a stop mode, an automatic operation mode,
When the mode is switched to one of the low-speed operation mode and the high-speed operation mode, a drive signal corresponding to any one of the modes is supplied to the wiper motor 4.

When the automatic operation mode is selected by turning on the automatic switch, the wiper switch 2 switches the resistances R2 and R6.
, The port 9a of the microcomputer 9 is set to the low level.
When the low-speed operation mode is selected by turning on the low-speed switch, the port 9b of the microcomputer 9 is set to the low level via the resistors R3 and R7. When the high-speed operation mode is selected by turning on the high-speed switch, the port 9c of the microcomputer 9 is set to low level via the resistors R4 and R8. When the cleaning operation mode is selected by turning on the cleaning switch, the resistors R1, R1
The port 9d of the microcomputer 9 is set to low level via R5.

The rain sensor 3 comprises a light emitting circuit 3a and a detecting circuit 3b. The rain sensor 3 is mounted within the wiping range of the wiper blade 13 and on the upper side of the windshield 51 on the indoor side, and optically detects the presence of raindrops within the wiping range. And outputs an electric signal corresponding to the raindrop. The light emitting circuit 3a includes a light emitting element LED, and the detecting circuit 3b includes a light receiving element P
D is provided. The light emitting element LED and the light receiving element PD are arranged slightly apart. In the rain sensor 3, the light emitting element LED of the light emitting circuit 3a is connected to the light receiving element P of the detecting circuit 3b through the front window glass 51.
The detection light is constantly generated toward D, and the detection circuit 3b converts the amount of the detection light into an electric signal, further amplifies the electric signal, and supplies the electric signal to the pulse forming circuit 7 and the integrating circuit 8, respectively. The detection circuit 3b applies a feedback loop to the light emitting circuit 3a. This is to make the amount of detection light received by the light receiving element PD constant. The level of the output generated by the detection circuit 3b becomes high at time a1 in FIG. 2 where no raindrops are attached to the front window glass 51. At time a2 in FIG. 2 when small raindrops adhere to the front window glass 51, at time a3 in FIG. 2 when large raindrops adhere, and at time a4 in FIG. 2 when continuous raindrops adhere, the size of the raindrops is reduced. Accordingly, the level of the output generated by detection circuit 3b is subdivided and lowered.

The wiper motor 4 is a three-brush DC motor having first, second, and third brushes 4a, 4b, and 4c. The first brush 4a is for a power supply and is connected to a power supply 50. The second brush 4b is for a low speed, and is connected to the normally closed fixed contact RL1-2 of the first relay RL1 provided in the output circuit 10. The third brush 4c is for high speed use and is provided with a first relay RL provided in the output circuit 10.
1 and is connected to one normally open fixed contact RL1-3. As shown in FIG. 4, a wiper arm 12 is connected to an output shaft 4 d provided on the wiper motor 4 via a link mechanism 11.
Is installed. The wiper blade 13 wipes back and forth between the first reversing position A and the second reversing position B of the wiping surface 52 defined on the front window glass 51 as the output shaft 4d of the wiper motor 4 rotates. The movement of the wiper blade 13 and the rotation of the output shaft 4d are synchronized,
One rotation of the output shaft 4d causes the wiper blade 1
No. 3 makes one reciprocation between the first reversing position A and the second reversing position B.

The wiper motor 4 has a built-in wiper fixed position stop circuit AS. The wiper fixed position stop circuit AS includes a movable contact AS-1, a power-side fixed contact AS-2, and a ground-side fixed contact AS-3. The movable contact AS-1 is connected to a second relay R provided in the output circuit 10.
L2 is connected to the normally closed fixed contact RL2-2. The power supply side fixed contact AS-2 is connected to the power supply 50. The ground-side fixed contact AS-3 is grounded. In the wiper fixed position stop circuit AS, when the wiper blade 13 is at the first inversion position A, which is the fixed position where the wiper blade 13 is stopped, the movable contact AS-1 is connected to the power-side fixed contact AS-2. When the wiper blade 13 moves away from the first reversing position A by the operation of the wiper motor 4, the movable contact AS-1 becomes the power-side fixed contact AS-2.
And is connected to the ground-side fixed contact AS-3. This is because when the stop switch is turned on and the stop mode is selected when the wiper blade 13 is in the middle of wiping without being in the first reversing position A where the stop position is, the first wiper blade 13 is still in the first position. Ground-side fixed contact A until it returns to the reversal position A
This is because the ground circuit of the wiper motor 4 is continuously formed via S-3 and the wiper motor 4 is continuously operated. When the wiper blade 13 reaches the first reversing position A, the movable contact AS-1 separates from the ground-side fixed contact AS-3 and is connected to the power-side fixed contact AS-2. For this reason, an armature short circuit is formed, and the wiper motor 4 stops suddenly.

The power supply circuit 6 includes an ignition switch 15
Is turned on, a predetermined drive voltage is applied to the port 9e of the microcomputer 9 and the rain sensor 3. Pulse forming circuit 7,
The integration circuit 8 has an output characteristic shown in FIG. The pulse forming circuit 7 has a function of differentiating the electric signal given from the rain sensor 3 and shaping the waveform to output as a pulse signal. Specifically, the component of the electric signal supplied from the detection circuit 3b of the rain sensor 3 is converted into a differentiated waveform by performing arithmetic processing and supplied to the port 9g of the microcomputer 9. The integration circuit 8 has a function of integrating the electric signal given from the rain sensor 3 and outputting the integrated value. Specifically, the component of the electric signal provided from the detection circuit 3b of the rain sensor 3 is converted into a waveform integrated by performing an arithmetic operation process, and is supplied to the port 9h of the microcomputer 9 as an analog voltage. This integral value changes depending on the pulse width of the pulse forming circuit 7 and the frequency of pulse generation. That is, FIG. 2 shows that no raindrops adhere to the front window glass 51.
At the middle time point a1, the pulse forming circuit 7 does not generate a pulse signal, and the integrating circuit 8 has the maximum level (for example, 3 V).
Generates a voltage signal. Time a2, time a3, and time a4 in FIG. 2 when raindrops adhere to the front window glass 51.
, The pulse forming circuit 7 generates a pulse signal having a pulse width corresponding to the size and frequency of the raindrop, and the integrating circuit 8
An integrated waveform corresponding to the pulse width and the frequency of pulse generation is generated. That is, when no raindrops are attached to the front window glass 51, no output is generated in the pulse forming circuit 7 and the output is low, and the output of the integrating circuit 8 is at the maximum level. In this case, since the electric signal supplied from the rain sensor 3 disappears, the outputs of the pulse forming circuit 7 and the integrating circuit 8 both go low.

The microcomputer 9 has ports 9a, 9b, 9c,
9d, 9e, 9g, 9h, 9i, 9j, 9m, 9n. Port 9n is grounded. Port 9i is a resistor R
9 is connected to the normally closed fixed contact RL2-2 of the second relay RL2 of the output circuit 10 and the movable contact AS-1 of the wiper fixed position stop circuit AS. The port 9j is a drive port that controls the low-speed operation of the wiper motor 4,
The port 9m is a high switching port that controls the high-speed operation of the wiper motor 4.

The output circuit 10 includes first and second relays RL
-1, RL-2, resistors R10, R11, and switching transistors TR1, TR2. When the port 9m of the microcomputer 9 is at a low level and the port 9j of the microcomputer 9 is at a high level, the switching transistor TR2 is turned on through the resistor R11 and the second relay R
The relay coil RL2-1 of L2 is turned on, and the movable contact R
L2-4 is separated from the normally closed fixed contact RL2-2 and is connected to the normally open fixed contact RL2-3. When the movable contact RL2-4 of the second relay RL2 is connected to the normally open fixed contact RL2-3, the second brush 4b of the wiper motor 4 moves the normally closed fixed contact RL1-2 of the first relay RL1. Contact RL1
-4, because the movable relay RL2-4 and the normally open fixed contact RL2-3 of the second relay RL2 are grounded, the output shaft 4d of the wiper motor 4 starts rotating at a low speed. When the port 9j of the microcomputer 9 is at a high level,
Is high, the switching transistor TR1 is turned on through the resistor R10, the relay coil RL1-1 of the first relay RL1 is turned on, and the movable contact RL1-4 is separated from the normally closed fixed contact RL1-2. It is connected to the normally open fixed contact RL1-3. First relay R
When the movable contact RL1-4 of L1 is connected to the normally open fixed contact RL1-3, the third brush 4c of the wiper motor 4
The normally open fixed contact RL1-3 of the first relay RL1, the movable contact RL1-4, and the movable contact RL2- of the second relay RL2.
4, since the grounding through the normally open fixed contact RL2-3,
The output shaft 4d of the wiper motor 4 starts rotating at high speed.

When the automatic switch of the wiper switch 2 is turned on and the port 9a goes low to enter the automatic operation mode, the microcomputer 9 sets the pulse forming circuit 7
Is provided with a memory means 9z having a plurality of storage units for sequentially and individually storing the pulse signals in a predetermined time (for example, 5 seconds). As shown in FIG. 3, the microcomputer 9 performs an averaging process of the pulse signal from the pulse forming circuit 7, that is, the raindrop signal. In this averaging process, the raindrop signal is stored for a predetermined time (for example, 5 seconds) by, for example, five timers as a plurality of storage units constituting the memory unit 9z. The number of timers stored by the counting means provided in the microcomputer 9, that is,
The number of raindrop signals is measured. After the timer counts up, the number of raindrop signals is subtracted. The subtraction resolution of each timer is set to, for example, 300 ms, and the timer counts the raindrop signals detected within 300 ms at the same timing, for example, every 5 ms. By this averaging process, an average raindrop signal is obtained from the number of raindrop signals detected before 5 s.

In the ROM area of the microcomputer 9, a ROM in which a standard intermittent time for the number of raindrop signals is set in advance.
A table RT is prepared, and the standard intermittent time according to the number of raindrop signals stored by the counting means is selected by the standard intermittent time selecting means provided in the microcomputer 9. The standard intermittent time is calculated by the calculating means provided in the microcomputer 9 with the integrated value of the integration circuit 8, and the standard intermittent time is corrected to a plurality of (for example, four) intermittent times according to the integrated value. . Here, the intermittent time means that the wiper blade 13 starts operating from the first reversing position A, which is the stop position, reaches the second reversing position B, turns back, returns to the first reversing position A, and stops. This is a pause time from the one reciprocating operation to the start of operation of the wiper blade 13 again.

The intermittent time corrected by the calculating means is compared with a first threshold value by an operation determining means provided in the microcomputer 9, and when the corrected intermittent time is less than the first threshold value, Both the port 9j and the port 9m are set to the high level to continuously operate the output shaft 4d of the wiper motor 4 at a high speed. When the corrected intermittent time is larger than the first threshold and smaller than the second threshold, the port 9j is set to the high level. And the port 9m is set to low level to continuously operate the output shaft 4d of the wiper motor 4 at low speed. When the corrected intermittent time is equal to or greater than the second threshold, only the port 9j and the port 9m are set to the low level to stop the output shaft 4d of the wiper motor 4 during the corrected intermittent time, and the intermittent time passes. Then, only the port 9j is set to the high level, the output shaft 4d of the wiper motor 4 is reciprocated once, and the wiper blade 13 is stopped at the first reverse position A. afterwards,
Port 9j and port 9m only during the corrected intermittent time
Are set to low level, and after the intermittent time passes, port 9
j is set to the high level again, and the output shaft 4 of the wiper motor 4
Operate d at low speed. Hereinafter, the repetitive intermittent operation is performed.

The first threshold value and the second threshold value have hysteresis characteristics. That is, the first threshold value is set to be slightly larger when the output shaft 4d of the wiper motor 4 is switched from the high-speed continuous operation to the low-speed continuous operation than when the output shaft 4d is switched from the low-speed continuous operation to the high-speed continuous operation. ing. Further, the second threshold value is set to be slightly larger when the output shaft 4d of the wiper motor 4 is switched from the low-speed continuous operation to the intermittent operation than when the output shaft 4d is switched from the intermittent operation to the low-speed continuous operation. . The reason for having the hysteresis characteristic is that when rainfall increases and intermittent operation switches from low-speed continuous operation or low-speed continuous operation to high-speed continuous operation, and when rainfall decreases, high-speed continuous operation changes to low-speed continuous operation or low-speed continuous operation. When switching from the continuous operation to the intermittent operation, the wiping surface 5 of the front window glass 51 even if the rainfall amount at the time of the switching is the same.
This is because the amount of rain attached to 2 is usually larger when the amount of rainfall decreases.

When the wiper blade 13 is operating in a predetermined area of the wiping range where the rain sensor 3 is mounted, the microcomputer 9 stores the predetermined area in the wiping range by a plurality of storage units of the memory means 9z. Mask means for setting a mask range that is prohibited from being stored in the memory. This mask range is set based on the time required for the wiper blade 13 to return to the first reversing position A after leaving the first reversing position A. This is because the wiper blade 13 adheres to the wiper blade 13 when the wiper blade 13 passes through the sensor detector C disposed between the light emitting element LED and the light receiving element PD on the windshield 51 as shown in FIG. Light receiving element PD by raindrops
This is because there is a fear that the fluctuation in the amount of received light occurs, and that the fluctuation in the amount of light is erroneously detected as a raindrop due to rainfall attached to the windshield 51. The time required from when the wiper blade 13 leaves the first reversing position A to when the wiper blade 13 returns to the first reversing position A depends on whether the movable contact AS-1 of the wiper fixed position stop circuit AS provided in the wiper motor 4 has a power supply. This is the time from the connection from the side fixed contact AS-2 to the ground side fixed contact AS-3 to the connection from the ground side fixed contact AS-3 to the power supply side fixed contact AS-2.

The mask means includes the previous wiper blade 1
3. The time to reach the first predetermined value among all the counter values of the wiper fixed position stop circuit time measurement counter by the operation of 3 is set as the mask start time, and the second predetermined value longer than the first predetermined value is set. The mask time setting means for setting the time to reach the mask end time as the mask end time, and the time of the counter value of the wiper fixed position stop circuit time measurement counter by the operation of the wiper blade 13 this time is between the mask start time and the mask end time. Determining means for determining whether or not the counter value is present, and the counting by the counting means is stopped only during the time when it is determined that the time of the counter value is between the mask start time and the mask end time. ing. Specifically, the first
Is 35% of the time of all counter values, and the second predetermined value is 60% of the time of all counter values.
This mask time is a time t1 from time a5 to time a6 as shown in FIGS. 2 and 5, and this mask time t1 is a value that fluctuates every time depending on the counter value of the wiper fixed position stop circuit time measurement counter. It is determined at any time.

When the automatic operation mode is selected, the microcomputer 9 sets the integrated value of the integrating circuit 8 to a predetermined value or less even though there is no pulse signal from the pulse forming circuit 7. A fixed intermittent time setting means is provided for controlling the output circuit 10 at a predetermined fixed intermittent time when the output voltage drops. If the rain sensor 3 fails at the time a7 in FIG. 2, an electric signal is not supplied from the rain sensor 3 to the pulse forming circuit 7 and the integrating circuit 8, so that the outputs of the pulse forming circuit 7 and the integrating circuit 8 are output. Both become low level. Here, when the rain sensor 3 is operating normally, when there is no electric signal from the rain sensor 3, that is, when it is not raining, the output of the pulse forming circuit 7 becomes low level. The output of circuit 8 goes high. Therefore, it can be recognized that a state where both the outputs of the pulse forming circuit 7 and the integrating circuit 8 are at the low level is an abnormal state. When the rain sensor 3 fails, only a predetermined fixed intermittent time, for example, a fixed intermittent time of 6 s,
The output shaft 4d of the wiper motor 4 is stopped by setting both the port 9j and the port 9m to the low level, and after the intermittent time of 6 s, only the port 9j is set to the high level and the output shaft 4d of the wiper motor 4 is reciprocated once to make a first reciprocation. The intermittent operation is performed so that the wiper blade 13 is stopped at the reverse position A. This is to execute a so-called fail-safe that prevents the wiper blade 13 from being operated for wiping due to the failure of the rain sensor 3 even in the rainy state.

In the microcomputer 9, when the low-speed operation mode is selected by turning on the low-speed switch of the wiper switch 2, the port 9j goes high. Therefore, the relay coil RL2-1 of the second relay RL2 provided in the output circuit 10 is turned on, and the output shaft 4 of the wiper motor 4 is turned on.
d is rotated at a low speed, and the wiper blade 13 performs a continuous wiping operation at a low speed. When the high-speed operation mode is selected by turning on the high-speed switch of the wiper switch 2, the microcomputer 9 sets the port 9j to a high level and the port 9m to a high level. Therefore, the relay coil RL2-1 of the second relay RL2 and the relay coil RL of the first relay RL1 provided in the output circuit 10 are provided.
1-1 are turned on, and the output shaft 4 of the wiper motor 4 is turned on.
d is rotated at a high speed, and the wiper blade 13 performs a continuous wiping operation at a high speed. When the cleaning operation mode is selected by turning on the cleaning switch of the wiper switch 2, the microcomputer 9 forms the grounding circuit of the washer motor 14, so that the washer motor 14 is operated.
The cleaning liquid stored in the washer tank is applied to the wiping surface 52.
Injected to.

The wiper control device 1 performs the control operation shown in FIGS. 6 to 10. The control cycle is set to 5 ms. When the automatic operation mode is selected by turning on the power and turning on the automatic switch of the switch 2 in a state where the rain is not falling and the windshield 51 is dry, the internal register Initial settings are made, the RAM is cleared in step 2, and a timer for the cycle of the program is started in step 3. Steps 1 to 4 are repeatedly executed until 5 ms, which is the program cycle, elapses. When 5 ms has elapsed, in step 5, "measurement of the program cycle is restarted" and the process proceeds to step 6. In step 6, "reading of the input signal from the switch 2" is executed, and the process proceeds to step 7. "Read connection state of wiper fixed position stop circuit AS" is executed, and the routine proceeds to step 10. Since it is determined in step 10 that "no raindrop signal exists", the process proceeds to step 14, and in step 14, "the averaging process cycle time of 300
Since ms has not elapsed, the process proceeds to step 20. At this time, since the output shaft 4d of the wiper motor 4 is not rotating, the process proceeds from step 20 to step 25 via step 22 and proceeds to step 25. The process proceeds to step 30 via steps 26, 27 and 28. Steps 10 to 18 are used for reading the electric signal of the rain sensor 3 and for averaging the raindrop signal. Steps 25 to 29 are used for setting a mask range (time) in the wiper fixed position stop circuit AS.

In step 30, "select the standard intermittent time from the ROM table according to the number of raindrop signals at that time" is executed using the predetermined ROM table RT shown in FIG. I do. At this time, since the number of raindrop signals is “0”, the standard intermittent time is “20”.
Is set, and the routine goes to step 40. In step 40, "reading of the integrated voltage level" is executed, and the routine goes to step 41. Since the integrated voltage is 3 V, the process proceeds to step 45 via steps 41, 42, 43, and 44, and proceeds to step 4
In step 5, "change the standard intermittent time to 2.0 times" is executed, and the process proceeds to step 50. In step 50, it is determined that "the value of the intermittent counter has not reached the intermittent time", so the process proceeds to step 53. Then, "set the intermittent standby flag" is executed, and the process proceeds to step 54. Since it is determined in step 54 that the value of the intermittent counter has not reached the intermittent time 9s, the process proceeds to step 55, where the intermittent counter is reset. Increment and go to step 60. Step 30 is used for standard intermittent time setting processing, and steps 40 to 49 are used for standard intermittent time correction processing, and steps 50 to 5 are used.
5 is used for the wiping determination process.

At step 60, it is determined that the "LOW (low-speed) mode is not set", so the routine proceeds to step 63, where the "intermittent time is a threshold value of intermittent operation to low-speed continuous operation (for example, 1.0 s)". Is determined to be "larger than", the process proceeds to step 65. In step 65, it is determined that "HI (high-speed) mode is not set", and the process proceeds to step 68. The operation is determined to be larger than the threshold value (for example, 0.5 s) of the high-speed continuous operation from the operation, and the process proceeds to step 70. In step 70, it is determined that the "HI mode flag is not set", so that the process proceeds to step 71. In step 71, it is determined that "LOW mode flag is not set", so the process proceeds to step 72, and step 72 In step 73, it is determined that the "intermittent standby flag is set", so the routine goes to step 73. In step 73, "set the intermittent standby mode" is executed, and the routine goes to step 80. Step 80, Step 81, Step 82
In step, each mode is determined, and the process proceeds to step 83.
Since it is determined in step 83 that "the intermittent standby mode is set", the process proceeds to step 84, in which the drive port 9j is turned off (low level) in step 84, and the high switching port 9m is turned off (low level) in step 85. ) And then return to step 4.

In this standby state, when there is rainfall and an electric signal corresponding to the raindrop is generated from the rain sensor 3, it is determined in step 10, step 5, step 6, and step 7 that "there is a raindrop signal". Then, the process proceeds to step 11, and it is determined in step 11 that "the mask flag is reset". Therefore, the process proceeds to step 12, and "increment the number of raindrop signals" is performed in step 12, and the process proceeds to step 13. The process proceeds to step 13, where “set the raindrop timer” is executed, and the process proceeds to step 14. Step 1
2. Counting of the number of raindrop signals is started in step 13, and since 300 ms has not elapsed in step 14, the process proceeds to step 30, via step 20, step 22, step 25, step 26, step 27, and step 28. Then, in step 30, the standard intermittent time “15” corresponding to the number of raindrop signals “1” is selected, and if the integrated voltage level is lower than 2.9 V in step 40, step 41, step 42, and it is determined that “integral value ≦ 2.9 V” in step 44 after step 43, and the process proceeds to step 46. In step 46, “the standard intermittent time is 1.5 times, that is, 22. Is changed to 5 s, and the process proceeds to steps 50, 53, and 54. In step 54, the value of the intermittent counter is set to the intermittent time 9s.
It is determined whether it is less than or equal to 9s.
The process proceeds from step 5 to step 60, and if it is 9 s or longer, the process proceeds from step 54 to step 60, and steps 63, 65, 68, 70 and 7 are performed.
1, step 72, step 73, step 80, step 81, step 82, step 83, step 8
4. Return to step 4 via step 85.

In this standby state, 300 m
After s elapses, the process proceeds from step 14 to step 15, and in step 15, "the number of raindrops is not" 0 ""
Is determined, the process proceeds to step S16.
Is performed, the process proceeds to step 17, and it is determined in step 17 whether or not the raindrop timer has become "0". If not, the process proceeds to step 20, If it is “0”, the process proceeds to step 18. In step 18, “decrement the number of raindrops” is executed, and the process proceeds to step 20.
Step 20, Step 22, Step 25, Step 26, Step 27, Step 28, Step 30, Step 40, Step 41, Step 42, Step 4
3, step 44, step 46, step 50, step 53, step 54, step 60, step 6
3, step 65, step 68, step 70, step 71, step 72, step 73, step 8
0, step 81, step 82, step 83, step 84, and step 85, and then return to step 4. In other words, if the set intermittent time is 9 seconds or more,
The value of the intermittent counter does not exceed the intermittent time in step 50, and the intermittent standby flag is always set in step 53. That is, when the set intermittent time is 9 seconds or longer, the output shaft 4d of the wiper motor 4 is prevented from being operated intermittently.

If the rainfall becomes slightly stronger and the number of raindrop signals is "6", the standard intermittent time is selected to be "4" in step 30, and the process proceeds to step 40. In step 40, if the integrated voltage level is, for example, 2.3 V, it is determined in step 43 that the process has passed through steps 41 and 42 that "integral value ≦ 2.6 V", so the process proceeds to step 47. Then, in step 47, "set the standard intermittent time to" 4s "as it is" is executed, and the process proceeds to step 50. If the value of the intermittent counter exceeds the intermittent time, the process proceeds to step 51, and in step 51, "intermittent standby" is performed. "Reset flag" is executed, and the process proceeds to step 52. In step 52, "clear intermittent counter" is executed and the process proceeds to step 60. Step 60, step 63, step 65, step 68, step 70, The process proceeds to the step 72 via the step 71, and in the step 72, the "intermittent standby flag is reset. Is set, the process proceeds to step 74. In step 74, “set INT wiping mode” is executed, and the process proceeds to step 80.
The process proceeds to step 82 via steps 80 and 81. Since it is determined in step 82 that the "INT wiping mode is set", the process proceeds to step 86 to turn on the drive port 9j (high level). Is performed, and the process proceeds to step 87. In step 87, “turn off the high switching port 9 m (low level)” is performed, and the process returns to step 4. Since the port 9j becomes high level with the intermittent time of 4s, the output shaft 4d of the wiper motor 4 is rotated at a low speed, and the wiper blade 13 wipes the wiping surface 52.

When the output shaft 4d of the wiper motor 4 starts rotating at a low speed, the movable contact AS of the wiper fixed position stop circuit AS
-1 is separated from the power-side fixed contact AS-2 and connected to the ground-side fixed contact AS-3. Therefore, in step 20, it is determined that "the movable contact AS-1 of the wiper fixed position stop circuit AS is connected to the ground-side fixed contact AS-3 (B → E)". Is executed, the "start wiper fixed position stop circuit time measurement counter" is executed, and the routine proceeds to step 22. The wiper fixed position stop circuit time measurement counter is configured to operate until the movable contact AS-1 of the wiper fixed position stop circuit AS is separated from the power supply side fixed contact AS-2 and then returned to and connected to the power supply side fixed contact AS-2. Is measured at any time. The time of this one cycle varies depending on the amount of raindrops on the wiping surface 52. If the movable contact AS-1 is not connected to the fixed contact AS-2 on the power supply side, in step 22, the "wiper fixed position stop circuit AS
It is determined that the movable contact AS-1 is not connected to the power-side fixed contact AS-2 (E → B).
To step 25, "35% of the value of the previous wiper fixed position stop circuit time measurement counter stored in the RAM area is substituted as the mask start time (A
(S time × 35% → mask start time) ”is executed, and the process proceeds to step 26. In step 26,“ 60% of the value of the previous wiper fixed position stop circuit time measurement counter stored in the RAM area is deleted. (A · S time × 60% → mask end time) ”is executed, and the process proceeds to step 27. In step 27, the value of the wiper fixed position stop circuit time measurement counter is changed to the mask start time and the mask. If it is determined that "the value of the wiper fixed position stop circuit time measurement counter is between the mask start time and the mask end time", the process proceeds to step 29. Then, “set the mask flag” is executed, and the steps that have been performed via steps 4, 5, 5, 6, 7, and 10 are executed. Because "the mask flag is set" it is judged in-flop 11, Step 12
Then, the process proceeds to step 14 without passing through step 13. Therefore, when the value of the wiper fixed position stop circuit time measurement counter is between the mask start time and the mask end time, the mask flag is set, and as a result, steps 12 and 13 are not executed, and the number of raindrop signal counts is reduced. No counting is performed. That is, while the wiper blade 13 is in operation, when the wiper blade 13 is passing through the mask range, the pulse signal of the pulse forming circuit 7 is stored in the plurality of storage units of the memory means 9z by the mask means. They are banned.

Thereafter, when the wiper blade 13 reciprocates once and reaches the first reversal position A, the wiper fixed position stop circuit A
Since the movable contact AS-1 of the S returns to and connects to the fixed contact AS-2 on the power supply side, the movable contact AS-1 of the wiper fixed position stop circuit AS is switched to the fixed contact A on the power supply side in step 22.
Since it is determined that (E → B) is connected to S-2, the process proceeds to step 23. In step 23, all the counter values of the wiper fixed position stop circuit time measurement counter are stored in the RAM area. The total counter value is cleared at 24. The total counter value stored in the RAM area becomes the value of the wiper fixed position stop circuit time measurement counter at the next operation of the wiper blade 13. The wiper blade 13 At the time of the first operation of the (output shaft 4d of the wiper motor 4), there is no value of the previous wiper fixed position stop circuit time measurement counter, so only when the power is turned on,
After execution of step 2, a standard counter value is entered in the RAM area. The wiper blade 13 is 1
After reciprocating, it stops at the first reversal position A, and if there is no change in the rainfall state, the intermittent operation is continued in the intermittent time of 4 s. When a change occurs in the rainfall state, the intermittent operation is performed at an intermittent time according to the rainfall state. Further, even if the number of raindrop signals is the same, the intermittent time is changed according to the magnitude of the integrated voltage level. When the integrated voltage level is small, that is, when the wiping performance of the wiper blade 13 is poor, the intermittent time is shortened. ing.

Thereafter, when the amount of rainfall increases and the number of raindrops is "8", the standard intermittent time is selected to be "2" in step 3, and the process proceeds to step 40. If the integrated voltage level is, for example, 2.0 V in step 40, it is determined in step 42 that has passed via step 41 that “integral value ≦ 2.1 V”. “Change the standard intermittent time to 0.5 times 1 s” is executed, and the process proceeds to step 50. If the value of the intermittent counter exceeds the intermittent time, the process proceeds to step 6 via steps 51 and 52.
0, and because the “LOW mode flag is not set” in step 60, the process proceeds to step 63,
In step 63, it is determined that “the intermittent time is the same value as the low-speed threshold value 1 s because of intermittent operation”, and the process proceeds to step 64. In step 64, “set the LOW mode flag” is executed, and Then, the process proceeds to step 71 via steps 65, 68, and 70.
It is determined that the OW mode flag is set.
"Set W mode" is executed, and the routine goes to Step 80. Then, the routine goes to Step 81 via Step 80. In Step 81, "LOW mode is set"
Then, the process goes to step 88 to execute "turn on drive port 9j (high level)", and then goes to step 89. In step 89, "high switch port 9m is turned off (low level)". Is executed and the process returns to step 4. Since the drive port 9j is continuously at the high level, the output shaft 4d of the wiper motor 4 is rotated at a low speed, and the wiper blade 13 is moved at a low speed between the first reversing position A and the second reversing position B of the wiping surface 52. Low-speed continuous operation with wiping.

Thereafter, if the amount of rainfall further increases and the number of raindrop signals exceeds "10", the standard intermittent time is selected to be "0.5" in step 30, and the process proceeds to step 40. In step 40, the integrated voltage level is, for example, 1.
If it is 8 V, it is determined that “integral value ≦ 2.1 V” in step 42 after the transition via step 41, so the process proceeds to step 48 and in step 48 “the standard intermittent time is increased by a factor of 0.5. "Change to 0.25 s" is executed, and the routine goes to Step 50. If the value of the intermittent counter exceeds the intermittent time, the routine goes to Step 60 via Steps 51 and 52. Step 61
In step 61, "the intermittent time has not become larger than the low-speed intermittent threshold of 1.5 s"
Is determined, the process proceeds to step 65, and step 65
In step 68, it is determined that the "HI mode flag has not been set".
Step 6
9, "set HI mode flag" is executed in step 69, and the process proceeds to step 70. Since it is determined in step 70 that "HI mode flag is set", the process proceeds to step 76. At step 76, "set HI mode" is executed, and the routine goes to step 80. At step 80, it is determined that "HI mode is set", so step 90 is executed.
Is executed, and "turn on (high level) drive port 9j" is executed.
Is executed to "turn on (high level) the high switching port 9m", and the process returns to step 4. Since the port 9j and the port 9m become high level, the output shaft 4d of the wiper motor 4 is rotated at high speed, and the wiper blade 13 moves between the first reverse position A and the second reverse position B of the wiping surface 52 at high speed. High-speed continuous wiping operation. In step 61, the threshold for switching from low speed to intermittent is set to 1.5 seconds, and in step 63, the threshold for switching from intermittent to low speed is set to 1.0 seconds.
And has hysteresis. Similarly, in step 66, the threshold for switching from high speed to low speed is set to 1.
The threshold value for switching from low speed to high speed is set to 0.5 s in step 68 to provide hysteresis.

In the event that the rain sensor 3 fails during the intermittent operation of the wiper blade 13 as described above, as shown in FIG. Circuit 8
Output becomes low level. Then, Step 4, Step 5, Step 6, Step 7, Step 1
0, shift to step 14, 300 ms in step 14
When the time has elapsed, the process proceeds to step 15, where steps 20, 21, 21, 22, 25 and 2 are performed.
6, the process proceeds to step 30 via step 27, step 28 or step 29, and in step 30, "the standard intermittent time is selected to be" 20 "because the number of raindrop signals is" 0 "] is executed, and step 40 is executed. In step 40, since the integrated voltage value becomes 0.5 V, for example, the process proceeds to step 41. In step 41, it is determined that "integral value ≦ 1.3V", so the process proceeds to step 49, and step 49 is performed. In "The standard intermittent time is 0.3
Is executed and the process proceeds to step 50. If the value of the intermittent counter exceeds the intermittent time, the process proceeds to step 51, where "reset the intermittent standby flag" is executed. In step 52, "clear the intermittent counter" is executed, and the process proceeds to step 60.
0, step 63, step 65, step 68, step 70, and step 71, and proceeds to step 72. Since it is determined in step 72 that the "intermittent standby flag has been reset", the procedure proceeds to step 74.
In step 74, "set INT wiping mode"
Is executed, and the routine goes to step 80. Step 80,
The process proceeds to step 82 via step 81, and in step 82, "INT wiping mode is set"
Then, the process shifts to step 86 to execute "turn on the drive port 9j (high level)" and shifts to step 87. In step 87, the "high switching port 9m is turned off (low level)". Is executed and the process returns to step 4. Since the drive port 9j becomes high level with the intermittent time of 6.0 s, the output shaft 4d of the wiper motor 4 is rotated at a low speed, and the wiper blade 13 is
2. The wiper is wiped at a low speed between the first inversion position A and the second inversion position B, and the intermittent operation is performed with a pause time of 6.0 s. Since the rain sensor 3 is out of order, the number of raindrop signals is always “0” regardless of the amount of rainfall, and the intermittent time of 6.0 s is a fixed intermittent time.

Even when the stop switch of the wiper switch 2 is turned on and the stop mode is selected while the wiper blade 13 is in the middle of wiping, the wiper blade 13 stops at the fixed wiper position until the wiper blade 13 returns to the first reverse position A. Since the movable contact AS-1 of the circuit AS is connected to the ground-side fixed contact AS-3, the grounding circuit of the wiper motor 4 is continuously formed, the wiper motor 4 continues to operate, and the wiper blade 13 is switched to the first inversion. When returning to the position A, the movable contact AS-1 of the wiper fixed position stop circuit AS is connected to the fixed contact AS-2 on the power supply side, so that the armature short circuit is applied to the wiper motor 4 and the output shaft 4d is suddenly stopped, and the wiper blade 13 stops at the first reversal position A.

[0045]

As described above, according to the wiper control device according to the present invention, the pulse signals of the pulse forming circuit to which the electric signal from the raindrop sensor is inputted are sequentially and individually outputted for a predetermined time. An average number of raindrop signals is obtained by counting the number of the stored plurality of storage units, and the number is selected according to the counted value, that is, the average number of raindrop signals. Since the standard intermittent time is corrected to a plurality of intermittent times according to the integral value of the integrating circuit, the operation mode of the wiper is automatically and finely changed according to the rainfall state. In addition, while the wiper blade is operating in the predetermined area where the raindrop sensor is attached, the pulse signal of the pulse forming circuit is prohibited from being stored in the plurality of storage units. Even if raindrops adhering to the wiper blade adhere to the raindrop sensor, there is no fear that the raindrops are erroneously detected as being caused by rainfall. Further, when the automatic operation mode is selected, the intermittent operation of the wiper blade is performed with a fixed intermittent time even if the raindrop sensor fails. Therefore, there is an excellent effect that the operation mode of the wiper according to rainfall can be automatically and finely changed.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of a wiper control device according to the present invention.

FIG. 2 is a waveform characteristic diagram of a rain sensor, a pulse forming circuit, and an integrating circuit in the wiper control device shown in FIG.

FIG. 3 is a time chart for explaining an averaging process in the wiper control device shown in FIG. 1;

4 is an external view of a front window glass and a wiper blade for explaining a mask process in the wiper control device shown in FIG. 1. FIG.

FIG. 5 is a timing chart for explaining mask processing in the wiper control device shown in FIG. 1;

FIG. 6 is a flowchart illustrating a control operation in the wiper control device illustrated in FIG. 1;

FIG. 7 is a flowchart illustrating a control operation in the wiper control device illustrated in FIG. 1;

FIG. 8 is a flowchart illustrating a control operation in the wiper control device illustrated in FIG. 1;

FIG. 9 is a flowchart illustrating a control operation in the wiper control device illustrated in FIG. 1;

FIG. 10 is a flowchart illustrating a control operation in the wiper control device illustrated in FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wiper control device 2 wiper switch 3 (raindrop sensor) rain sensor 4 wiper motor 4 b (low speed brush) second brush 4 c (high speed brush) third brush 5 controller 7 pulse forming circuit 8 integration circuit 9 microcomputer 10 output Circuit 13 Wiper blade 52 Wiping surface A First reversal position B Second reversal position

Continued on the front page (72) Inventor Naoki Morita 1760 Higashimatano-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term (reference) 3D025 AA01 AB01 AD01 AG11 AG18 AG21 AG34 AG42 AG78

Claims (7)

[Claims] A wiper motor having a low-speed brush and a high-speed brush, and operating a wiper blade at a low speed or a high speed in a wiping range between a first reversing position and a second reversing position on a wiping surface; A wiper switch having a switch, an automatic switch, a low-speed switch, and a high-speed switch, each of which can be selectively switched; and a stop mode, an automatic operation mode, a low-speed operation mode, and a high-speed operation mode when the wiper switch is selectively switched. A microcomputer that switches to any one of the modes, and an output circuit that supplies a drive signal corresponding to the one of the modes to the wiper motor,
A controller that controls the wiper motor, a raindrop sensor that is mounted in the wiping range, optically detects the presence of raindrops in the wiping range, and outputs an electric signal corresponding to the raindrops; An electric signal is input, a pulse forming circuit that differentiates the electric signal, shapes the waveform, and outputs it as a pulse signal, and an electric signal from the raindrop sensor is input, and when the electric signal is absent, the electric signal is maximum, and the electric signal is An integration circuit that outputs an integrated value that becomes smaller in accordance with the electric signal when the electric signal is increased, wherein the microcomputer outputs a pulse signal of the pulse forming circuit when an automatic operation mode is selected by turning on the automatic switch. A memory unit having a plurality of storage units for sequentially and individually storing at predetermined times, and the plurality of storage units storing the pulse signal; Counting means for counting the number of storage units, and a predetermined area of the wiping range to which the raindrop sensor is attached, while the wiper blade is operating, the pulse signal of the predetermined area is stored in the plurality of storage units. Mask means for setting a mask range for prohibiting the reading, a standard intermittent time selecting means for selecting a standard intermittent time according to the count value of the counting means from a ROM table preset in the microcomputer, Calculating means for calculating the standard intermittent time obtained from the standard intermittent time selecting means and the integrated value of the integration circuit, and correcting the standard intermittent time to a plurality of intermittent times according to the integrated value; When the corrected intermittent time is equal to or less than the first threshold, the wiper motor is continuously operated at a high speed, and the corrected intermittent time is larger than the first threshold. Is smaller than the second threshold value is a slow continuous operation of the wiper motor,
When the corrected intermittent time is equal to or greater than the second threshold, operation determining means for controlling the output circuit so that the wiper motor operates intermittently with the corrected intermittent time, and an automatic operation mode is selected. When the integrated value of the integrating circuit drops below a predetermined value despite no output from the pulse forming circuit, the output circuit is controlled at a predetermined fixed intermittent time. A wiper control device comprising: a fixed intermittent time setting means for controlling. 2. A raindrop sensor comprising: a light emitting circuit including a light emitting element for generating detection light; and a detection circuit including a light receiving element for receiving the detection light and converting a received light amount into an electric signal. 2. The wiper control device according to claim 1, wherein a feedback loop is applied from the detection circuit to the light emitting circuit to make the light amount a constant value. 3. The first threshold value is set to be slightly larger when the wiper motor is switched from high-speed continuous operation to low-speed continuous operation than when it is switched from low-speed continuous operation to high-speed continuous operation. At the same time, the second threshold value is set to be slightly larger when the wiper motor is switched from the low-speed continuous operation to the intermittent operation than when it is switched from the intermittent operation to the low-speed continuous operation. The wiper control device according to claim 1, wherein the wiper control device is provided. 4. The mask means sets a mask range based on a time required from when the wiper blade leaves the first reversing position to when the wiper blade returns to the first reversing position, and the time is provided to the wiper motor. The movable contact of the wiper fixed position stop circuit is separated from one fixed contact of the pair of fixed contacts and connected to the other fixed contact, and then separated from the other fixed contact and connected to the one fixed contact. The wiper control device according to claim 1, wherein the time is set to time. 5. The mask means starts measurement when the movable contact of the wiper fixed position stop circuit is separated from one fixed contact and connected to the other fixed contact, and the movable contact is separated from the other fixed contact and the one fixed contact is stopped. 5. The wiper control device according to claim 4, further comprising a wiper fixed position stop circuit time measurement counter for terminating the measurement when connected to the fixed contact, and setting the mask range based on the time of the counter value. 6. The masking means sets a time to reach a first predetermined value as a mask start time among all counter values of a wiper fixed position stop circuit time measurement counter by the previous operation of the wiper blade. And a mask time setting means for setting a time to reach a second predetermined value longer than the first predetermined value as a mask end time, and a counter value of a wiper fixed position stop circuit time measurement counter by the operation of the current wiper blade. Has a discriminating means for discriminating whether or not the time is between the mask start time and the mask end time, and the time when the counter value is judged to be between the mask start time and the mask end time. The wiper control device according to claim 5, wherein the counting means stops counting only during the period. 7. The method according to claim 1, wherein the first predetermined value is three times the time of the total counter value.
5%, and the second predetermined value is 60% of the time of all the counter values.
%. The wiper control device according to claim 6, wherein