JPH04314654A - Windshield wiper - Google Patents

Abstract

PURPOSE:To decrease a number of on-off times of pair of motors for preventing asynchronization, when a pair of wiper blades are synchronously controlled by a pair of the motors so as to prevent generation of interference, and to prevent the interference by applying a brake to suddenly stop the motor in the case correction of asynchronization is impossible by on-off operating the motor. CONSTITUTION:When a driver side motor (Dr motor) is driven from an upper turning position to a lower turning position and when a passenger side motor (Pa motor) is driven from a lower turning position to an upper turning position, possibility of interference is provided when the Dr motor is moved ahead, so that the Dr motor is turned off (step 224, 226) when the Dr motor is preceded by 1 or more from the Pa motor. Since no possibility of interference is provided when the Pa motor is preceded, the Pa motor is prevented from being turned off (step 228, 230) till the Pa motor is preceded by 1.5 or more. In this way, a number of motor off-times can be decreased. When the Dr motor is preceded by 2 or more from the Pa motor, a brake is applied to prevent interference (step 220, 222) by suddenly stop the motor.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a windshield wiper, and more particularly to a windshield wiper equipped with a pair of wiper blades for wiping windshield glass and a pair of motors that independently wipe the wiper blades. .

0002

2. Description of the Related Art Conventionally, a windshield wiper has been known which includes a pair of wiper blades and a pair of motors that independently wipe the wiper blades. In this windshield wiper, the wiper blades operate independently without using a link mechanism, so interference between the wiper blades may occur.To prevent this interference, the motor is controlled to control the wiper blades. need to be synchronized. U.S. Patent 4,585,98
No. 0 (Japanese Unexamined Patent Publication No. 59-120551) describes a synchronization method in which one motor is operated continuously to cause one wiper blade to perform a continuous wiping operation, and only the other motor controls the angular position of the two wiper blades. It is disclosed that on/off control is performed according to the following.

0003

However, in the above-mentioned conventional technology, since ON/OFF control is performed for only one motor, ON/OFF control may be biased toward only one motor. Furthermore, when the pair of wiper blades is brought close to the lower inversion position and stopped, there is a problem in that the number of times the motor is turned on and off increases at the beginning of the wiper operation, that is, at the beginning of the wiper operation when interference is most likely to occur. In addition, when driving at high speeds, the wiper blade is subject to wind pressure, and when the wiper blade moves from the upper inverted position to the lower inverted position, the load acting on the wiper blade increases, and when the wiper blade moves from the upper inverted position to the lower inverted position, the wiper blade receives wind pressure. The load acting on the is reduced. For this reason, if the same synchronous control is performed regardless of the wiping direction as in the past, there is a problem that the operating feeling deteriorates when the positions of the wiper blade on the driver side and the wiper blade on the passenger side are greatly misaligned. be.

The present invention has been made to solve the above-mentioned problems, and its first object is to provide a windshield wiper in which interference does not occur during the initial stage of operation.

A second object of the present invention is to provide a windshield wiper that provides a good operating feeling by changing synchronization control depending on the direction of the wiping operation.

A third object of the present invention is to provide a windshield wiper in which the number of times the motor stops is reduced by changing synchronization control depending on the preceding wiper blade.

[0007]

[Means for Solving the Problems] In order to achieve the above first object, a first invention provides a pair of wiper blades for wiping a windshield glass, and a pair of wiper blades that partially overlap each other near a lower inverted position. a driving means for independently reciprocating the pair of wiper blades within a wiping range; a detection means for detecting the position of each of the pair of wiper blades; and a detection means for detecting the position of each of the pair of wiper blades; Control for controlling the drive means such that each of the blades approaches a lower inverted position of the wiping range and stops, and after one wiper blade moves to an upper inverted position of the wiping range, the other wiper blade starts operating. means and
It is composed of:

In order to achieve the second and third objects, a second invention includes a pair of wiper blades for wiping the windshield glass, and a wiper blade that partially overlaps each other near the lower inverted position. a drive means for independently reciprocating the pair of wiper blades within the range; a detection means for detecting the position of each of the pair of wiper blades; and an upper inversion position of the wiping range based on the detection result of the detection means. determining means for determining which wiper blade moves in the direction of the wiper blade or the wiper blade that moves in the downward reverse position direction, and the pair of wiper blades performs a wiping operation based on the determination result of the determining means. The driving means is controlled, and when the wiper blade moving toward the lower reversing position precedes the wiper blade moving toward the upper reversing position by a first predetermined value or more, the wiper blade moving toward the lower reversing position is stopped. , when the wiper blade moving toward the upper reversing position precedes the wiper blade moving toward the lower reversing position by a second predetermined value exceeding the first predetermined value, the wiper blade moving toward the upper reversing position stops. and control means for controlling the driving means so as to perform the driving means.

[0009] The control device of the second aspect of the present invention provides for a wiper blade that moves in the direction of the lower inverted position when the wiper blade moves in the direction of the lower inverted position when the wiper blade moves in the direction of the lower inverted position. can be controlled so that it comes to a sudden stop.

[0010] Furthermore, the control device of the second invention is arranged such that when the wiper blade moving in the direction of the lower inverted position within a predetermined region within the wiping range has preceded the wiper blade by a third predetermined amount, which is larger than the first predetermined amount, The wiper blade moving toward the lower reverse position can be controlled to suddenly stop.

[0011] In order to achieve the above object, the third invention includes a pair of wiper blades for wiping the windshield glass, and a wiper blade that is arranged independently within a wiping range that partially overlaps with the other wiper blades. a driving means for reciprocating the pair of wiper blades, a detection means for detecting the position of each of the pair of wiper blades, and a determination means for determining which of the pair of wiper blades is in the lead based on the detection result of the detection means. , controlling the driving means so that the pair of wiper blades perform a wiping operation in the same direction based on the judgment result of the judgment means, and the wiper blade moving in the direction approaching the overlap area moves in the direction away from the overlap area. When the moving wiper blade is ahead of the moving wiper blade by a first predetermined value or more, the wiper blade moving in the direction approaching the overlap area stops, and the wiper blade moving in the direction away from the overlap area moves in the direction approaching the overlap area. control means for controlling the driving means so that the wiper blade moving in a direction away from the overlap area stops when the wiper blade moves in a direction away from the overlap region when the wiper blade moves ahead of the wiper blade by a second predetermined value exceeding the first predetermined value; It is composed of

[0012] In the control means of the third invention, the wiper blade that moves in the direction approaching the overlap area is moved in the first direction while the wiper blade that moves in the direction away from the overlap area is located within the overlap area. The driving means can be controlled so that the wiper blade moving in the direction approaching the overlap region suddenly stops when the wiper blade is ahead by a third predetermined value, which is larger than the predetermined value of .

[0013]

[Operation] The operation of the first invention will be explained below. The pair of wiper blades of the present invention are each independently reciprocated within a wiping range that partially overlaps each other at the lower inverted position. The positions of the wiper blades that are reciprocated are detected by respective detection means. The control means causes each of the pair of wiper blades to approach and stop a lower inverted position of the wiping range based on the detection result of the detection means. When starting the operation of the wiper blades, the control means controls the drive means so that the operation of the other wiper blade is started after one wiper blade has moved to the upper reverse position of the wiping range. There is an overlap region near the lower reversed position, and the pair of wiper blades are stopped close to the lower reversed position, but after one wiper blade moves to the upper reversed position of the wiping range, the other wiper blade moves to the upper reversed position of the wiping range. Therefore, after one wiper blade moves to the position farthest from the overlap area, the other wiper blade starts operating. Therefore, it is possible to prevent the wiper blade from interfering with each other when the wiper operation starts.

The determination means of the second invention determines which wiper blade moves in the direction of the upper inverted position of the wiping range or the wiper blade that moves in the lower inverted position direction based on the detection result of the detection means. to judge. The control means controls the drive means so that the pair of wiper blades perform a wiping operation based on the determination result of the determination means, and the wiper blade moving toward the lower inversion position is configured to move in the direction of the upper inversion position so that the wiper blade moves toward the upper inversion position. When the wiper blade moves in the direction of the lower reversal position when the wiper blade is ahead by a predetermined value of 1 or more, the wiper blade is stopped. The control means is also configured to drive the wiper blade moving toward the upper reversing position to stop when the wiper blade moving toward the upper reversing position precedes the wiper blade moving toward the lower reversing position by a second predetermined value or more. Control the means. This second predetermined value is larger than the first predetermined value. When the wiper blade moving toward the lower reversal position is ahead of the wiper blade moving toward the upper reversal position, that is, when the wiper blade approaching the overlap region is ahead of the wiper blade leaving the overlap region, the upper Before the wiper blade moving in the direction of the reverse position leaves the overlap area, the wiper blade moving in the direction of the lower reverse position enters the overlap area and there is a high possibility that the wiper blade will interfere, so when the wiper blade is ahead by more than the first predetermined value. That is, even if the preceding value is small, interference of the wiper blades is prevented by stopping the preceding wiper blade.

On the other hand, when the wiper blade moving toward the upper inverted position is ahead of the wiper blade moving toward the lower inverted position, that is, the wiper blade leaving the overlap area is ahead of the wiper blade approaching the overlap area. When the wiper blade moves toward the upper inverted position, the wiper blade that moves in the downward inverted direction enters the overlap area after the wiper blade that moves in the upward inverted position comes out of the overlap area, so there is a low possibility that wiper blade interference will occur. For this reason, the wiper blade moving toward the upper inverted position is placed second than the wiper blade moving toward the lower inverted position.
The wiper blade moving in the direction of the upper inversion position is stopped when the leading value exceeds a predetermined value, and the leading wiper blade is not stopped until the leading value becomes large.

As mentioned above, if there is a high possibility that interference will occur, the leading wiper blade will be immediately stopped, and if there is a low possibility that interference will occur, the leading wiper blade will be stopped until the amount of wiper blade displacement becomes large. By preventing the wiper blade from stopping, the number of times the wiper blade stops is reduced and the operating feeling can be improved.

Note that synchronized control of the wiper blade is not required in areas where there is no possibility of interference, so when the wiper blade is present in the overlap area or in a predetermined area including the overlap area, The wiper blade may be controlled only when the vehicle is in use.

In the second invention, when the wiper blade moving toward the lower inverted position is ahead of the wiper blade moving toward the upper inverted position by a third predetermined value or more, that is, in a state where there is a high possibility of interference, the amount of deviation is determined. When the amount increases, it is best to stop the wiper blade suddenly to prevent interference.

[0019] Furthermore, if the number of sudden stops of the wiper blade increases, it may cause a problem in the operational feeling, so the wiper blade is stopped only when it is within a predetermined area within the wiping range, for example, when the wiper blade is in the overlap area. , it is effective to stop the wiper blade suddenly.

[0020] The pair of wiper blades of the above invention each independently move in different directions within a wiping range that partially overlaps each other at the lower inverted position, that is, when one wiper blade moves toward the upper inverted position. The other wiper blade reciprocates toward the lower inverted position. A pair of wiper blades according to a third aspect of the invention described below are arranged so that each wiper blade independently moves in the same direction, that is, when one wiper blade moves toward the upper reversed position, the other wiper blade also moves toward the upper reversed position. It moves back and forth. In a typical example of such a windshield wiper, an area including an upper inverted position of the first wiping range and an area on the lower inverted side between the upper inverted position and the lower inverted position of the second wiping range. overlap.

The determination means of the third aspect of the invention determines which of the pair of wiper blades is in the lead position based on the detection result of the detection means. The control means controls the driving means so that the pair of wiper blades perform a wiping operation in the same direction based on the determination result of the determination means, and also controls the wiper blade in a direction in which the wiper blade moves in a direction approaching the overlap region and moves away from the overlap region. A wiper blade moving in a direction approaching an overlap region is stopped when the wiper blade moves in a direction approaching an overlap region when it precedes a wiper blade moving in a direction equal to or more than a first predetermined value. The control means also includes a wiper blade that moves in a direction away from the overlap region when the wiper blade that moves in the direction away from the overlap region precedes the wiper blade that moves in the direction toward the overlap region by a second predetermined value or more. The drive means is controlled so that the motor stops. In the first wiping range of the above typical example, the direction approaching the overlap area is the direction from the lower inverted position to the upper inverted position, and the direction approaching the overlap area is the direction from the lower inverted position to the upper inverted position, and
In the wiping range, the direction is from the upper inverted position to the lower inverted position. The direction away from the overlap region is the opposite direction to the above. This second predetermined value is larger than the first predetermined value. When the wiper blade moving toward the overlap area is ahead of the wiper blade moving away from the overlap area, the wiper blade moving away from the overlap area may pass the overlap area before the wiper blade moves away from the overlap area. When a wiper blade moving in a direction approaching the overlap area enters the overlap area and is likely to interfere with the wiper blade, when the wiper blade is ahead by more than the first predetermined value, that is, the wiper blade is ahead even if the leading value is small. By stopping the wiper blade, interference with the wiper blade is prevented.

On the other hand, when the wiper blade moving away from the overlap area is ahead of the wiper blade moving towards the overlap area, the wiper blade moving away from the overlap area overlaps. Since a wiper blade that moves in a direction approaching the overlap area after leaving the area enters the overlap area, there is a low possibility that wiper blade interference will occur. Therefore, when the wiper blade moving away from the overlap area is ahead of the wiper blade moving towards the overlap area by a second predetermined value or more, the wiper blade moving away from the overlap area is stopped. In this way, the leading wiper blade is not stopped until the leading value becomes large.

As mentioned above, if there is a high possibility that interference will occur, the leading wiper blade will be immediately stopped, and if there is a low possibility that interference will occur, the leading wiper blade will be stopped until the amount of wiper blade displacement becomes large. By preventing the wiper blade from stopping when the wiper blade is in use, the number of times the wiper blade stops is reduced and the operating feeling can be improved in the same way as described above.

Note that in areas where there is no possibility of interference, synchronous control of the wiper blades is not required, so when the wiper blades are in the overlap area or in a predetermined area including the overlap area, The wiper blade may be controlled only when the vehicle is in use.

In the second invention, while the wiper blade moving in the direction away from the overlap area is located in the overlap area, the wiper blade moving in the direction approaching the overlap area is moved in the direction away from the overlap area. When the wiper blade is ahead of the moving wiper blade by a third predetermined value or more, that is, when the amount of deviation becomes large with a high possibility of interference, it is preferable to stop the wiper blade suddenly to prevent interference. In this way, by suddenly stopping the wiper blade only when one of the wiper blades is present in the overlap region, the number of times the wiper blade is stopped suddenly is reduced, and a poor feeling can be prevented.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 schematically shows the wiper device of this embodiment. This wiper device includes a driver side (Dr side) drive device 16 and a passenger side (Pa side) drive device 18, each of which is equipped with a motor. ing. The other ends of wiper arms 24 each having a wiper blade 22 at one end are connected to the driver-side drive device 16 and the passenger-side drive device 18 . Driver side drive device 16
and the passenger side drive device 18 are connected to a control circuit 20 to supply a synchronization signal and an inversion signal, and the control circuit 20 is connected to control each motor of the driver side drive device 16 and the passenger side drive device 18. There is. The control circuit 20 also includes a wiper switch 26 and an ignition switch 28 for turning on and off the wiper device.
and a washer switch 30 are connected.

Next, the driver-side drive device 16 and the passenger-side drive device 18 will be explained in detail. Note that since the driver-side drive device 16 and the passenger-side drive device 18 have the same configuration, only the driver-side drive device 16 will be described below, and a description of the passenger-side drive device 18 will be omitted.

FIG. 2 shows a cross-sectional view of the driver-side drive device 16, in which a commutator 34 is installed in the first casing 36 so that the rotating shaft 38 protrudes from the opening side of the first casing 36. A motor 32 equipped with the following is housed. A single spiral worm 40 is installed on the tip side of the rotating shaft 38.
is fixed.

The second casing combined with the first casing 36
A worm wheel 44 that meshes with the worm 40 is rotatably housed in the casing 42 of the casing 42 . On one side of the worm wheel 44, the worm wheel 44
An eccentric shaft 46 is fixed at a position eccentric from the center of rotation. The eccentric shaft 46 rotatably supports the other end of a first link 50 having a sector gear 48 formed at one end thereof. A pin 52 is fixed to the center of the sector gear 48. One end of a second link 54 is rotatably supported by this pin 52 . Further, a fan-shaped gear 56 that meshes with the fan-shaped gear 48 is provided. An output shaft 58 is fixed at the center of this fan-shaped gear 56.
The second casing 42 has one end protruding from the second casing 42.
It is rotatably supported by a casing 42 of. The output shaft 58 rotatably supports the other end of the second link 54 . Further, a wiper arm (not shown) is connected to the tip of the output shaft 58.

As shown in FIG. 3, the worm wheel 44
A cam plate 60 formed of a conductive member constituting a position detector is fixed along the circumferential direction of the worm wheel 44 to the other surface of the worm wheel 44 . An upper reversing protrusion 64 and a lower reversing protrusion 66, which protrude in the direction of the rotation axis, are formed on the cam plate 60 at positions facing each other with the rotation axis of the worm wheel 44 interposed therebetween. Both end portions of the cam plate 60 in the circumferential direction are opposed to each other at a predetermined distance apart, and a cutout portion 62 is formed in the center portion of the cam plate 60 in the circumferential direction, and the width thereof is narrower than that of the other portions. cam plate 60
Comb teeth portions 60A and 60B are formed between the notch portion 62 and both ends thereof, each having a large number of rectangular openings circumferentially bored therein. A first contactor 72 is provided at a position where it can contact the upper inversion protrusion 64 and the lower inversion protrusion 66, and the comb tooth portion 60
A second contact 70 is disposed at a position where it can contact the cam plate 60, and a grounded common contact 68 is disposed at a position where it can contact a portion of the cam plate 60 where the comb tooth portions 60A, 60B are not formed. is located.

The reason why the comb tooth portions 60A and 60B are provided in a portion of the cam plate as described above is as follows. When one wiper blade moves from the lower reversed position to the upper reversed position, the other wiper blade moves from the upper reversed position to the lower reversed position, causing interference until one wiper blade leaves the overlap area. there is a possibility. Therefore, the comb teeth portion 60B is provided so that a synchronizing signal is generated in the area near the lower inverted position when the wiper blade moves from the lower inverted position to the upper inverted position, and the comb teeth part 60B is provided so that the wiper blade moves from the upper inverted position to the lower inverted position. The comb tooth portion 60 is arranged so that a synchronizing signal is generated in the area near the upper reversal position.
A is provided. On the other hand, after one wiper blade leaves the overlap area, the other wiper blade is located in the area near the top inversion position, so there is no possibility of interference even if the other wiper blade enters the overlap area. . Therefore, a synchronization signal is not required in the area near the top inversion position when the wiper blade moves from the bottom inversion position to the top inversion position, and in the area near the bottom inversion position when the wiper blade moves from the top inversion position to the bottom inversion position. No comb teeth are provided.

Next, details of the control circuit 20 will be explained with reference to FIG. The common brush of the driver side motor 32D is connected to the vehicle battery via a fuse. The high-speed brush of the driver-side motor 32D is connected to the H contact of a driver-side speed changeover switch 76D composed of a relay, and the low-speed brush is connected to the L contact of the driver-side speed changeover switch 76D. A common contact C of the driver-side speed changeover switch 76D is connected to a common contact C of a driver-side short-circuit switch 78D constituted by a relay. This common contact C is always connected to the B contact. The B contact of the short-circuit switch 78D on the driver side is connected to the power supply,
The A contact of the driver side shorting switch 78D is connected to the drain of the driver side FET 82D, and is also connected to the input port of the microcomputer 88 via the driver side current detector 80D. Driver side FET82D
The source is grounded and the gate is connected to the driver side drive circuit 84D.
It is connected to the output port of the microcomputer 88 via.

The passenger side motor 32P is connected in the same way as the driver side motor 32D, and the passenger side is provided with a speed selector switch 76P, a short-circuit switch 78P, a current detector 80P, an FET 82P, and a drive circuit 84P like the driver side. These are connected in the same way as the driver side.

Further, the power source of the microcomputer 88 is
It is connected to the vehicle battery, and a driver side position detector 74D, a passenger side position detector 74P, a wiper switch 26, an ignition switch 28, and a washer switch 30 are connected to the signal input. In addition, IN1
, IN2, IN3, and IN4 are inverters. Next, the operation of the drive device will be explained. When the rotating shaft 38 of the motor rotates, the worm 40, the worm wheel 44, and the first
The output shaft 58 is reciprocated through a predetermined angle range through the link 50, the fan gear 48, and the fan gear 56, thereby swinging the wiper arm 24. The worm wheel 44 is rotated as the rotating shaft 38 rotates, and when the cam plate 60 of the position detector conducts the common contact 68 and the second contact 70 with the rotation of the worm wheel 44, the inverter Since the input end of the inverter is grounded through the second contact 70, the cam plate 60, and the common contact 68, as shown in FIG. A synchronizing signal, which is a pulse signal that is at a high level while both are electrically connected, is output. By counting the number of pulses of this synchronization signal, the position of the wiper blade 22 is detected, and the driver side drive device 16 and the passenger side drive device 18 are controlled respectively so that the driver side wiper blade and the passenger side wiper blade do not interfere with each other. be done.

When the second contact 70 contacts the cam plate 60 and the first contact 72 contacts the upper reversal projection 64, a reversal signal indicating the upper reversal position of the wiper blade is output as shown in FIG. , the second contact 70 does not contact the cam plate 60 and the first contact 72 does not touch the lower inversion protrusion 66
When it comes into contact with the wiper blade, a reversal signal indicating the lower reversal position of the wiper blade is output as shown in FIG.

Next, the wiper blade operating routine performed by the microcomputer 88 will be explained. FIG. 6 shows the main routine. In step 100, signals output from the position detectors 74D, 74P, current detectors 80D, 80P, etc. are taken in, and in step 102, the currents detected by the current detectors 80D, 80P are Over the specified time (
For example, 20 seconds), it is determined whether or not the motors 32D and 32P are locked by determining whether the time is greater than or equal to a predetermined value. When the motor is locked, an overcurrent flows through the motor, so locking of the motor can be detected by determining whether the current flowing through the motor is equal to or greater than a predetermined value. Note that it is possible to determine whether or not the motors 32D and 32P are locked by determining whether or not the signal from the first contactor 72 or the second contactor 70 has not changed for a predetermined period of time or longer (for example, 20 seconds). may also be determined. When the motor is locked, there is no change in the synchronization signal and the inversion signal, so the locking of the motor can be detected by doing the above. When it is determined that either or both of the motors 32D and 32P are locked, the short circuit switch 7 on the driver side is activated in step 120.
8D, by switching the common contact C of the passenger side short-circuit switch 78P to the B contact, the driver side motor 3
By short-circuiting the common brush and the high speed brush (or low speed brush) of the 2D and passenger side motors 32P, a brake is applied to the driver side motor 32D and the passenger side motor 32P to stop them. In the next step 122, it is determined whether any of the wiper switch, washer switch, or ignition switch has been operated, and if the switch has been operated, step 124 is performed.
In step 100, an instantaneous power cutoff operation to be described later is performed, and if the switch is not operated, the process directly returns to step 100.

When it is determined in step 102 that none of the motors is locked, it is determined in step 104 whether or not the power to the microcomputer 88 has been turned on, and when the power has been turned on, step 1 is executed.
In step 24, a power interruption operation is performed, and if the power has not been turned on, it is determined in steps 106 and 108 whether the ignition switch (IG switch) or the wiper switch is turned on, and whether either the ignition switch or the wiper switch is turned off. Step 1 if
At step 18, a basic stopping operation to be described later is performed, and when both the ignition switch and the wiper switch are on, the process proceeds to step 110. In step 110, the driver side position detector 74D and the passenger side position detector 74D
The passenger (P
a) Determine whether or not the side wiper blade is in the downward inverted position. If the determination is affirmative, flag F is set in step 112.
After setting the flag to 1 and performing a basic operation described later in step 114, an abnormal operation described later is performed in step 116. Note that when a negative determination is made in step 110, the process directly advances to step 114.

FIG. 7 shows an interrupt routine that is interrupted when the synchronization signal output from the driver side position detector 74D and the passenger side position detector 74P rises or falls. It is determined whether the synchronization signal that has fallen has been output from the driver-side position detector 74D. When it is determined that the synchronization signal has been output from the driver-side position detector 74D, the driver-side count value CD is incremented by 0.5 in step 132. On the other hand, when it is determined in step 130 that the rising or falling synchronization signal has been output from the passenger side position detector 74P, the passenger side count value CP is incremented by 0.5 in step 134, and the process returns to the main routine.

As a result of the above, the count values CP and CD are incremented by one every time one pulse is output from each position detector.

FIG. 8 shows details of the instantaneous power interruption operation routine in step 124. In step 140, it is determined based on the reversal signal whether the driver side wiper blade and the passenger side wiper blade are both located in the lower reversal position, and when the affirmative determination is made, the process proceeds directly to the next step, and when the negative determination is made, the step 1
At step 42, it is determined whether or not only the passenger side wiper blade is located at the lower reversed position. When only the passenger side wiper blade is located in the lower reversed position, the driver side motor 32D is turned on in step 146, and when none of the wiper blades is located in the lower reversed position, the driver side motor 32D is turned on in step 144. Then, the passenger side motor 32P is turned on.

As a result of the above, for some reason, the power supply is momentarily cut off before the wiper blade is located at the downward inverted position.
After that, when the power is turned on, the motors of the wiper blades that are not located in the lower inverted position are turned on, and the driver-side wiper blade and the passenger-side wiper blade are positioned in the lower inverted position.

FIG. 9 shows details of the basic stop routine of step 118. In step 150, it is determined whether the passenger side wiper blade is located in the lower inverted position based on the inverted signal, and if it is not in the lower inverted position, a basic operation is performed in step 114, and the wiper blade is moved to the lower inverted position. Step 1 when doing
In step 52, as explained above, the brake is applied by short-circuiting the brushes of the passenger side motor 32P to stop the passenger side motor 32P, and in step 154, it is determined whether the driver side wiper blade is located in the lower reversal position. to judge. When the wiper blade on the driver side is not in the lower inverted position, the driver side motor 32D is kept turned on in step 158, and when it is in the lower inverted position, the brushes of the driver side motor 32D are short-circuited in step 156 to apply the brake. is applied to the driver side motor 32D.
to stop.

As a result of the above, when the ignition switch or the wiper switch is turned off, the passenger side wiper blade is stopped by the brake in the lower inverted position, and then the driver side wiper blade is stopped in the lower inverted position by the brake. This state is represented by g, h, and i in Figure 5.
Shown below.

FIG. 10 shows the basic operation routine of step 114. In step 160, the flag F
Determine whether 1 is set. When the flag F1 is set, that is, when the passenger side wiper blade is located at the lower inverted position, the driver side wiper blade is moved from the lower inverted position to the upper inverted position (hereinafter referred to as open operation) in step 162. When it is determined in step 160 that flag F1 is reset, it is determined in step 164 whether flag F2 is set. Flag F2
is set, that is, when the driver side wiper blade is located in the upper inverted position and the passenger side wiper blade is located in the lower inverted position, the driver side wiper blade is operated from the upper inverted position to the lower inverted position. (hereinafter referred to as close operation), and also opens the passenger side wiper blade. On the other hand, when the flag F2 is reset, that is, when the driver side wiper blade is located at the lower reversed position and the passenger side wiper blade is located at the upper reversed position, the driver side wiper blade is operated to open, and Close the wiper blade on the passenger side.

FIG. 11 shows a detailed routine for opening the driver side wiper blade in step 162 in FIG. Determine whether it is located. When the driver side wiper blade is located at the upper reversal position, the flag F1 is reset in step 174 and the flag F2 is set, and the count values CD and Cp are cleared in step 176.

As a result, when the ignition switch and the wiper switch are turned on with the driver side wiper blade and the passenger side wiper blade located in the downward inverted position, only the driver side wiper blade remains open until it reaches the upward inverted position. activated. This state is shown in FIGS. 5a, b, and c.

FIG. 12 shows the details of the routine of step 166 in FIG. 10 in which the wiper blade on the driver side is operated to close and the wiper blade on the passenger side is operated to open. In step 180, the driver-side motor 32D and passenger-side motor 32P are turned on, and in step 182, it is determined whether or not a synchronization signal is being output, thereby determining whether or not there is an interference range. When it is within the interference range, first synchronization control, which will be explained below, is performed in step 184. In the next step 186, it is determined whether the wiper blade on the driver side is located at the lower reversal position, and when it is located at the lower reversal position, the count value CD is cleared and the driver side FET 82D is turned off to turn off the driver side motor 32D. Turn it off. In the next step 190, it is determined whether or not the passenger side wiper blade is located in the upper inverted position. When it is located in the upper inverted position, in step 192, the count value CP is cleared and the passenger side FET 82 is cleared.
By turning off P, the passenger side motor 32P
Turn off. In the next step 194, it is determined whether the driver side wiper blade is in the lower reversed position and the passenger side wiper blade is in the upper reversed position.If the determination is affirmative, the flag F2 is reset in step 196.

As a result of the above, when the wiper blade on the driver side is operated to close and the wiper blade on the passenger side is operated to open, the wiper blade on the driver side is temporarily stopped at the downward inverted position and the count value C is
P is cleared, the passenger side wiper blade is temporarily stopped at the upper reverse position, and the driver side count value CD is cleared.

FIG. 13 shows the details of the routine in step 168 of FIG. 12 in which the wiper blade on the driver side is operated to open and the wiper blade on the passenger side is operated to close. In step 200, the driver-side motor 32D and passenger-side motor 32P are turned on, and in step 202, it is determined whether or not a synchronization signal is being output, thereby determining whether or not there is an interference range. When it is within the interference range, second synchronization control, which will be explained below, is performed in step 204. In the next step 206, it is determined whether the driver side wiper blade is located at the upper reversal position, and when it is located at the upper reversal position, the count value CD is cleared and the driver side motor 32D is turned off. In the next step 210, it is determined whether the passenger side wiper blade is located at the lower inverted position.
When it is located at the lower inversion position, the count value Cp is cleared in step 212 and the passenger side motor 32P is turned off. In step 214, it is determined whether the driver side wiper blade is in the upper inverted position and the passenger side wiper blade is in the lower inverted position.If the judgment is affirmative, in step 216, the flag F is
Set 2.

As a result of the above, even when the wiper blade on the driver side is operated in the open position and the wiper blade on the passenger side is operated in the closed position, the count value CD remains unchanged when the wiper blade on the driver side is located at the upper reverse position.
is cleared and the driver side motor 32D is turned off, and when the passenger side wiper blade is located at the lower reversal position, the count value CP is cleared and the passenger side motor 32P is turned off.

Next, referring to FIG. 14, step 1 of FIG.
The details of the first synchronous control routine of No. 84 will be explained below. In step 220, the count value CD is changed to the count value CP.
By determining whether the difference (synchronization deviation) CD −CP obtained by subtracting CD −CP is greater than or equal to a third predetermined value (for example, 2), it is determined whether the driver side wiper blade is ahead of the passenger side wiper blade by a third predetermined value or more. Decide whether or not. When the determination in step 220 is affirmative, in step 222, the brushes of the driver side motor 32D are short-circuited to activate the brake and bring the driver side motor 32D to a sudden stop. When the determination at step 220 is negative, it is determined at step 222 whether the difference CD −CP is greater than or equal to a first predetermined value (for example, 1). Step 224
When the determination is affirmative, the driver side FET 82D is turned off and the driver side motor 32D is turned off. Step 22
If the judgment in step 4 is negative, the difference CD is determined in step 228.
It is determined whether or not -CP is less than or equal to a second predetermined value (for example, -1.5). When the judgment in step 228 is affirmative,
That is, when the passenger-side wiper blade is ahead of the driver-side wiper blade by a second predetermined value or more, the passenger-side FET 82P is turned off to turn off the passenger-side motor 32P.

As a result of the above, as shown in FIG. 24, the wiper blade operating in a closed manner, that is, the wiper blade entering the overlap area, precedes the wiper blade operating in the open position, that is, the wiper blade exiting from the overlap area, by a first predetermined value or more. When the wiper blade is closed, the motor on the wiper blade side is turned off and the wiper blade is stopped. The third one whose synchronization difference exceeds the first predetermined value
If this occurs above a predetermined value, the motor on the preceding wiper blade side is suddenly stopped by the brake. In addition, if the preceding wiper blade is the wiper blade that comes out of the overlap area, there is a low possibility that interference will occur, so if the wiper blade that is leading is the wiper blade that comes out of the overlap area, there is a low possibility that interference will occur.
The number of times the motor is turned on and off is reduced by not stopping the motor on the leading wiper blade side until the wiper blade is ahead by a predetermined value or more.

FIG. 15 shows details of the second synchronous control routine of step 204 in FIG. Step 2
32, it is determined whether the difference CP - CD obtained by subtracting the driver side count value CD from the passenger side count value CP is greater than or equal to a third predetermined value (for example, 2), and if the determination is affirmative, the passenger side motor 32P is to a sudden stop using the brakes. Step 23
If the judgment in step 2 is negative, the difference CP is determined in step 236.
It is determined whether or not -CD is greater than or equal to a first predetermined value (for example, 1), and if the determination is affirmative, the passenger side motor 32P is turned off by turning off the passenger side FET 82P in step 238. If the judgment in step 236 is negative, in step 240 the difference CP −
By determining whether CD is less than or equal to a second predetermined value (for example, −1.5), it is determined whether the driver-side wiper blade is ahead of the passenger-side wiper blade by a second predetermined value or more. If the determination in step 240 is affirmative, then in step 242 the driver side
By turning off ET82D, passenger side motor 32P is turned off.

As a result of the above, when the wiper blade that operates to close is ahead by more than the first predetermined value, the motor on the side that operates to close is stopped, and the wiper blade that operates to close is in the third position. When the wiper blade is ahead by a predetermined value or more, the motor of the preceding wiper blade is suddenly stopped by the brake. On the other hand, when the open wiper blade is in the lead, there is little chance of interference occurring, so the motor on the leading wiper blade side is not turned off until the open wiper blade is ahead by more than a second predetermined value. do.

FIG. 16 shows details of the abnormality operation routine at step 116 in FIG. In step 250, it is determined whether the count value CD when the driver side motor 32D rotates once is a predetermined value (corresponding to the number of pulses in normal operation when the motor 32D rotates once). When the affirmative judgment is made, it is normal, so in step 252, it is checked whether the count value CP when the passenger side motor 32P makes one revolution is a predetermined value (corresponding to the number of pulses in normal operation when the motor 32P makes one revolution). to decide. If the determination at step 252 is affirmative, it is normal and the process proceeds to the next step. If the judgment in step 250 is negative, the count value CD is abnormal, so step 2
At 54, it is determined whether the driver side wiper blade is located at the upper inverted position. Step 25 when the driver side wiper blade is located in the upper inverted position.
At step 6, the driver side motor 32D is braked to stop the driver side wiper blade, and only the passenger side wiper blade is operated. On the other hand, step 252
If a negative determination is made in , the count value CP is abnormal, so in step 258 it is determined whether the passenger side wiper blade is located at the upper inversion position or the lower inversion position. A brake is applied to the motor 32P to stop the passenger side wiper blade and only the driver side wiper blade to operate.

FIG. 17 shows another routine for abnormal operation. In step 250, similarly to FIG. 16, it is determined whether the count value when the driver side motor 32D makes one revolution is a predetermined value, and the predetermined value is determined. If not, step 26
In step 6, it is determined whether the count value CD has been cleared. When the count value CD is cleared, it is the upper inversion position or the lower inversion position, so step 268 is performed.
, the count value C is calculated by the difference between the count value and the predetermined value.
Correct D. In the next step 264, step 25
2, it is determined whether the count value when the passenger side motor 32P makes one revolution is a predetermined value or not. If it is not a predetermined value, it is determined in step 270 whether or not the count value CP has been cleared, and the count value CP is When it is cleared, the count value CP is corrected in step 272 by the difference between the count value and the predetermined value.

As a result of the above, even if the number of pulses generated per revolution of the motor becomes abnormal or the count value becomes abnormal due to electrical noise, etc., the position of the wiper blade can be controlled with high accuracy by correcting the count value. can.

FIG. 18 shows a first modification of the first synchronous control. This routine is the routine of FIG. 14 with steps 274 and 276 added. In step 276, it is determined whether the difference CD -CP is less than or equal to a second predetermined value (for example, -2), so that the passenger side wiper blade that operates in the open direction precedes the driver side wiper blade in the close operation by a second predetermined value or more. If the judgment is affirmative, the passenger side motor 32P is stopped by the brake in step 276.

As a result of the above, even when the possibility of interference occurring is low as shown in FIG. 24, when the wiper blade on the passenger side is ahead by a third predetermined value or more, the wiper blade on the passenger side is suddenly stopped.

FIG. 19 shows a first modification of the second synchronous control. This modification adds steps 280 and 282 to the routine of FIG.
Similarly to the routine described above, even when there is a low possibility that interference will occur, when the driver-side wiper blade is ahead by a third predetermined value or more, the preceding driver-side wiper blade is suddenly stopped.

FIG. 20 shows a second modification of the first synchronous control. This routine is the routine of FIG. 14 with steps 284, 286, and 288 added. In step 284, the difference CD −CP is set to a predetermined value (
For example, by determining whether the value is greater than or equal to -0.5), it is determined whether the passenger-side wiper blade operating in the open position is ahead of the driver-side wiper blade in the closing operation by a predetermined value or more. If the determination in step 284 is affirmative, it is determined in step 286 whether or not the driver side motor 32D was turned off last time, and if the driver side motor 32D was turned off last time, step 28
At step 8, the driver side motor 32D is turned on.

As a result of the above, as shown in FIG. 24, the driver side motor 32D is turned off when the difference CD -CP becomes 1 or more, and the motor is turned off when the difference CD -CP becomes -0.5. A hysteresis characteristic is provided for turning the motor on and off.

FIG. 21 shows a second modification of the second synchronous control, and this routine is similar to the routine of FIG. 20 by adding steps 290, 292 and 2 to the routine of FIG.
94 is added to turn off the passenger side motor 32P when the difference CP -CD is 1 or more, and when the difference CP -CD becomes -0.5 or more, the passenger side motor 32P is turned off.
A hysteresis characteristic is provided for turning the motor on and off by turning on P.

FIG. 22 shows a third modification of the first synchronous control. This third modification is obtained by adding the first and second modifications to the first synchronous control routine shown in FIG. Therefore, corresponding parts are given the same reference numerals and their explanation will be omitted.

FIG. 23 shows a third modification of the second synchronous control. This third modified example is obtained by adding the first and second modified examples described above to the second synchronous control shown in FIG. 15, and therefore, the same parts are given the same reference numerals and a description thereof will be omitted.

Next, a second embodiment of the present invention will be explained in detail. In this embodiment, the wiper blade is brought to a sudden stop only within a specific area, thereby reducing the number of sudden stops and improving the operating feeling.

FIG. 25 shows the driver side position detector of this embodiment. Note that in FIG. 25, parts corresponding to those in FIG. 3 will be described with the same reference numerals. A cam plate 60 made of a conductive member is fixed along the circumferential direction of the worm wheel 44. An upper reversing protrusion 64 and a lower reversing protrusion 66 that protrude in the direction of the rotation axis are formed on the cam plate 60 at positions facing each other with the rotation axis of the worm wheel 44 interposed therebetween. Notches 62A and 62B are formed on the outer circumferential portion of the cam plate 60, and the width thereof is narrower than that of other portions. A first contact 72 is arranged at a position where it can contact the upper inversion protrusion 64 and the lower inversion protrusion 66, and a second contactor 72 is arranged at a position where it can contact the outer circumference of the cam plate 60.
A grounded common contact 68 is disposed at a position where it can contact the center of the cam plate 60. The first contact 72 is connected to a microcomputer 88 via an inverter IN1, and the second contact 70 is connected to a microcomputer 88 via an inverter IN2.

On the commutator 34 side of the rotating shaft 38,
A two-pole magnet M formed in a ring shape is connected to the rotating shaft 38.
It is fixed to surround. A Hall element 74 is provided near the magnet M so as to face the outer periphery of the magnet M.
are placed close together. Therefore, the Hall element 74 generates a synchronization signal corresponding to the rotation of the motor. Note that the synchronization signal may be generated using a rotary encoder or an MRE element.

Note that the passenger side position detector also has the same structure as the driver side position detector.

Cam signal 1, cam signal 2, and synchronization signal shown in FIG. 26 are output from inverter IN1, inverter IN2, and Hall element 74, respectively. According to this position detector, the upper inversion position, the lower inversion position, and the brake controllable range can be determined by the combination of cam signal 1 and cam signal 2.

The wiper blade operating routine of this embodiment is substantially the same as that of the above embodiment, so only the differences will be explained. In this embodiment, in order to perform interference prevention control over the entire wiping range, a routine for operating the driver side wiper blade in a closed operation and operating the passenger side wiper blade in an open operation is as shown in FIG. 27. Similarly to this routine, the step of determining the interference range is omitted in the routine for opening the wiper blade on the driver side and closing the wiper blade on the passenger side.

Further, when the wiper blade moving in the downward reversal direction is ahead and the wiper blade is to be braked to the motor to stop the wiper blade, as an example, as shown in FIG. 28, there is a step of applying the brake to the driver side motor or the passenger side motor. Before this step, a step 300 is provided to determine whether or not the brake controllable area is reached based on the cam signal 1 and the cam signal 2, and when it is determined that the brake controllable area is reached, the motor is braked, and if it is not the brake controllable area, the motor is braked. The motor is turned off when the determination is made.

By combining the cam plate shown in FIG. 3 and the cam plate shown in FIG. 25, a synchronizing signal is generated only within a range where there is a possibility of interference, and a range narrower than this range, for example, an overlap where the wiping range overlaps. The operation of the wiper blade may be controlled using the lap area as a brake controllable area.

Next, a third embodiment of the present invention will be described. In this embodiment, the present invention is applied to a windshield wiper in which a wiper blade on the driver side and a wiper blade on the passenger side perform a wiping operation in the same direction. As shown in FIG. 29, this windshield wiper blade includes a wiper arm 24 having a wiper blade 22 at one end, and these wiper arms are connected to the driver-side drive device and the passenger-side drive device described above. There is. The wiping range of the passenger side wiper blade is an area including the upper inverted position U, and overlaps with the area between the upper inverted position and the lower inverted position of the driver side wiper blade, and the area near the lower inverted position L. ing. The position detection device and control circuit of this embodiment are the same as those of the above embodiment. The inversion signal and synchronization signal of this embodiment are as shown in FIG. Next, the wiper blade operation routine of this embodiment will be explained. The operation routine of this embodiment is substantially the same as the operation routine of the first embodiment, so corresponding parts are given the same reference numerals and only different parts will be explained.

FIG. 31 shows the main routine of this embodiment. In FIG. 31, steps 110 and 11 of FIG.
2 is omitted. Therefore, when it is determined in step 108 that the wiper switch is on, the process directly proceeds to step 114.

The interrupt routine that is interrupted by the rising and falling edges of the synchronization signal in this embodiment is the same as that shown in FIG. 7, and is therefore not shown.

FIG. 32 shows the power supply interruption operation routine of this embodiment. In FIG. 32, step 142 of FIG.
146 is omitted. Therefore, when both the driver-side wiper blade and the passenger-side wiper blade are not located in the downward inverted position, the driver-side and passenger-side motors are turned on.

FIG. 33 shows the basic stop routine of this embodiment. In FIG. 33, step 114 in FIG. 9 is omitted and a new step 151 is added. Therefore, when the passenger side wiper blade is not located at the lower reversal position, the passenger side motor continues to be on in step 151.

FIG. 34 shows the basic operation routine of this embodiment. In FIG. 34, steps 160 and 1 of FIG.
62 is omitted. Also, step 166 in FIG.
In step 168, the driver-side wiper blade and passenger-side wiper blade are operated to close, and in step 168, the driver-side wiper blade and the passenger-side wiper blade are operated to open. Therefore, the two wiper blades are operated in the same direction.

In this embodiment, the driver side wiper blade open operation routine shown in FIG. 11 is omitted, and when the ignition switch and the wiper switch are turned on, the driver side wiper blade and the passenger side wiper blade are simultaneously opened.

FIG. 35 shows the details of the routine for closing the driver-side wiper blade and the passenger-side wiper blade in step 166 of FIG. 34. 35 is substantially the same as FIG. 12, but in this embodiment, when the driver side wiper blade and the passenger side wiper blade are located at the lower inverted position, the count values CD, CP
is cleared, the motors on the driver side and the passenger side are turned off, and the flag F2 is reset.

FIG. 36 shows details of the routine for opening the driver-side wiper blade and the passenger-side wiper blade in step 168 of FIG. 34. 36 is substantially the same as FIG. 13, but in this embodiment, when the driver side wiper blade and the passenger side wiper blade are located in the upper inverted position, the count values CD, CP
is cleared, the motors on the driver side and the passenger side are turned off, and flag F2 is set.

The first synchronous control routine and the second synchronous control routine of this embodiment are the same as those shown in FIGS. 14 and 15, and therefore illustration thereof is omitted.

FIG. 37 shows an abnormal operation routine of this embodiment corresponding to FIG. 16, and step 2 in FIG.
At step 58, it is determined whether or not the passenger side wiper blade is located at the lower reverse position. If the determination is affirmative, at step 260, the passenger side motor is braked to stop the passenger side wiper blade.

A modification of the abnormal operation routine of the first embodiment (FIG. 17), a first modification of the first synchronous control routine (FIG. 18), and a first modification of the second synchronous control routine Example (FIG. 19), second modification example of the first synchronous control routine (FIG. 20), second modification example of the second synchronous control routine (FIG. 21), third modification example of the first synchronous control routine Variant (
22) and the third modification of the second synchronous control routine (FIG. 23) can be applied as is to the third embodiment.

Further, the driver side position detection device of the second embodiment can also be applied to a windshield wiper in which the driver side wiper blade and the passenger side wiper blade perform wiping operations in the same direction. Cam signals 1, 2 and pulse signals in this case are as shown in FIG. Also,
In order to perform interference prevention control over the entire wiping range, a routine for closing the wiper blades on the driver side and the passenger side is shown in FIG. Further, in the routine for opening the wiper blades on the driver side and the passenger side, the step of determining the interference range is omitted, similarly to this routine. In addition, when applying the brake to the motor to stop the wiper blade, the brake control is performed based on cam signal 1 and cam signal 2 before the step of applying the brake to the driver side motor or passenger side motor as explained in Fig. 28. What is necessary is to provide a step of determining whether or not the brake control is possible, and apply the brake to the motor when it is determined that the brake control is possible, and turn off the motor when it is determined that the brake control is not possible.

[0087]

[Effects of the Invention] As explained above, according to the first invention, since the operation of the other wiper blade is started after one wiper blade is operated to the upper reverse position, interference between the wiper blades occurs. The effect is that it is possible to obtain a wiper operation pattern that is difficult to perform.

Further, according to the second and third inventions, when there is a high possibility of interference, the leading wiper blade is immediately stopped, and when there is a low possibility of interference, the wiper blade is stopped until the amount of displacement becomes large. Since the preceding wiper blade is not stopped, the number of times the wiper blade stops is reduced, and the effect of improving the operating feeling is obtained.

Furthermore, in the above invention, when the amount of deviation becomes large in a state where there is a high possibility that interference will occur, the leading wiper blade is suddenly stopped, so interference of the wiper blades can be efficiently prevented. You can get the effect that you can do it.

Furthermore, by limiting the area where the wiper blade suddenly stops, it is possible to reduce the number of sudden stops of the wiper blade and improve the operating feeling.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a windshield wiper of first and second embodiments.

FIG. 2 is a sectional view of a windshield wiper drive device.

FIG. 3 is a schematic diagram of a driver-side position detection device.

FIG. 4 is a circuit diagram showing details of a control circuit.

FIG. 5 is a diagram showing the relationship between a synchronization signal, an inversion signal, and the position of a wiper blade.

FIG. 6 is a flowchart showing the main routine of the first and second embodiments.

FIG. 7 is a flow chart showing an interrupt routine that is interrupted by the rising and falling edges of a synchronization signal.

FIG. 8 is a flowchart showing a power interruption operation routine.

FIG. 9 is a flowchart showing a basic stop routine.

FIG. 10 is a flowchart showing a basic operation routine.

FIG. 11 is a flowchart showing a driver side wiper blade open operation routine.

FIG. 12 is a flowchart showing a routine for operating the driver side wiper blade in a closed operation and operating the passenger side wiper blade in an open operation.

FIG. 13 is a flowchart showing a routine for operating the driver-side wiper blade to open and operating the passenger-side wiper blade to close.

FIG. 14 is a flowchart showing a first synchronous control routine.

FIG. 15 is a flowchart showing a second synchronous control routine.

FIG. 16 is a flowchart showing an abnormality operation routine.

FIG. 17 is a flowchart showing a modification of the abnormal operation routine.

FIG. 18 is a flowchart showing a first modification of the first synchronous control routine.

FIG. 19 is a flowchart showing a first modification of the second synchronous control routine.

FIG. 20 is a flow chart showing a second modification of the first synchronous control routine.

FIG. 21 is a flowchart showing a second modification of the second synchronous control routine.

FIG. 22 is a flow chart showing a third modification of the first synchronous control routine.

FIG. 23 is a flow chart showing a third modification of the second synchronous control routine.

FIG. 24 is a diagram showing on/off states of a driver-side wiper motor and a passenger-side wiper motor.

FIG. 25 is a schematic diagram of a driver-side position detection device according to another embodiment of the present invention.

26 is a diagram showing the relationship between the cam signal 1, the cam signal, and the synchronization signal output from the driver-side position detection device shown in FIG. 25, and the position of the wiper blade.

FIG. 27 is a flow chart showing a routine for operating the driver side wiper blade in a closed operation and operating the passenger side wiper blade in an open operation according to the second embodiment of the present invention.

FIG. 28 is a flowchart showing a first synchronous control routine of the second embodiment of the present invention.

FIG. 29 is a schematic diagram showing the wiping range of another type of windshield wiper to which the present invention is applicable.

FIG. 30 is a diagram showing the relationship between the synchronization signal and the inversion signal and the position of the wiper blade in the third embodiment.

FIG. 31 is a flowchart showing the main routine of the third embodiment.

FIG. 32 is a flowchart showing a power interruption operation routine of the third embodiment.

FIG. 33 is a flowchart showing a basic stop routine of the third embodiment.

FIG. 34 is a flowchart showing the basic operation routine of the third embodiment.

FIG. 35 is a flowchart showing a routine for closing the driver-side and passenger-side wiper blades of the third embodiment.

FIG. 36 is a flowchart showing a routine for opening the driver-side and passenger-side wiper blades of the third embodiment.

FIG. 37 is a flowchart showing an abnormal operation routine of the third embodiment.

38] When the driver-side position detection device shown in FIG. 25 is applied to the third embodiment, cam signal 1, cam signal 2, and synchronization signal output from the driver-side position detection device shown in FIG. FIG. 3 is a diagram showing the relationship with the position of the wiper blade.

FIG. 39 is a flowchart showing a routine for closing a pair of wiper blades when the second embodiment is applied to a windshield wiper in which a pair of wiper blades perform a wiping operation in the same direction.

[Explanation of symbols]

22 Wiper blade 32D Driver side motor 32P Passenger side motor

Claims (6)

[Claims] 1. A pair of wiper blades for wiping a windshield glass; and a drive means for independently reciprocating the pair of wiper blades within a wiping range that partially overlaps each other near a lower inverted position. , a detection means for detecting the position of each of the pair of wiper blades; and based on the detection result of the detection means, each of the pair of wiper blades approaches a lower inverted position of the wiping range and stops, and one wiper blade is stopped. A windshield wiper comprising: control means for controlling the driving means so that the other wiper blade starts operating after the blade moves to an upper reverse position of the wiping range. 2. A pair of wiper blades for wiping a windshield glass; and a drive means for independently reciprocating the pair of wiper blades within a wiping range that partially overlaps each other near a lower inverted position. , a detection means for detecting the position of each of the pair of wiper blades, and a wiper blade that moves in the direction of an upper inversion position and a wiper blade that moves in the direction of a lower inversion position of the wiping range based on the detection result of the detection means. determining means for determining which one is in the lead; and controlling the driving means so that the pair of wiper blades perform a wiping operation based on the determination result of the determining means; When the wiper blade moves in the direction of the upper reversal position by a first predetermined value or more, the wiper blade that moves in the direction of the lower reversal position stops, and the wiper blade that moves in the direction of the upper reversal position moves in the direction of the lower reversal position. A windshield wiper comprising: a control means for controlling the driving means so that the wiper blade moving in the upward inversion position direction stops when the wiper blade is ahead of the wiper blade by a second predetermined value exceeding the first predetermined value. . 3. The control means is configured to suddenly stop the wiper blade moving toward the lower reversing position when the wiper blade moving toward the lower reversing position precedes the wiper blade by a third predetermined value that is larger than the first predetermined value. 3. A windshield wiper according to claim 2, wherein said driving means is controlled so as to. 4. The control means is configured such that the wiper blade, which moves in a downward reverse position direction within a predetermined area within a wiping range,
3. The windshield wiper according to claim 2, wherein the drive means is controlled so that the wiper blade moving toward the lower reversal position suddenly stops when the wiper blade moves forward by a third predetermined value, which is larger than the predetermined value. 5. A pair of wiper blades for wiping a windshield glass; driving means for independently reciprocating the pair of wiper blades within a wiping range that partially overlaps each other; a detection means for detecting the position of each of the wiper blades; a judgment means for judging which of the pair of wiper blades is in front based on the detection result of the detection means; The driving means is controlled so that the wiper blades perform a wiping operation in the same direction, and the wiper blade moving in the direction approaching the overlap area precedes the wiper blade moving in the direction away from the overlap area by a first predetermined value or more. When the wiper blade moving toward the overlap region stops, the wiper blade moving away from the overlap region exceeds the first predetermined value than the wiper blade moving toward the overlap region. A windshield wiper comprising: control means for controlling the driving means so that the wiper blade moving in a direction away from the overlap region stops when the wiper blade moves in a direction away from the overlap region when the wiper blade moves ahead by a second predetermined value or more. 6. The control means controls the wiper blade moving toward the overlap region to a first predetermined value while the wiper blade moving away from the overlap region is located within the overlap region. 6. The windshield wiper according to claim 5, wherein the drive means is controlled so that the wiper blade moving in the direction approaching the overlap region suddenly stops when the wiper blade moves in the direction approaching the overlap region when the wiper blade is ahead by a third predetermined value or more.