JP2008254609A - Wiper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper device capable of preventing high-current from continuously flowing into a wiper motor, and capable of securing a driver's visibility. <P>SOLUTION: The wiper device reciprocally rotates the output shaft of the wiper motor to reciprocally turn a vehicle wiper coupled with the output shaft, and thus wipes on a window glass. The wiper device is equipped with a controller which presses an obstacle with the vehicle wiper during a wiping motion (S3) based on detection of a restricted state of the vehicle wiper due to the obstacle such as piles of snow satisfying a reverse permission condition on the winder glass (S1, S2), and relaxes a force in a direction of pressing the obstacle by lowering output of the wiper motor (S5), and then, reversibly drives the output shaft and the vehicle wiper (S6) by restarting the wiping motion in a direction reverse to a direction pressing the obstacle with the vehicle wiper. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wiper device that reciprocally turns a vehicle wiper to wipe off a vehicle window glass.

2. Description of the Related Art Conventionally, there is a wiper device that wipes the windshield by rotating a vehicle wiper connected to an output shaft by rotating the output shaft of a wiper motor forward and backward.
Further, the wiper device compares the load current of the wiper motor with a threshold value to detect the locked state of the vehicle wiper, and when the lock is detected, stops driving or generates a large torque to avoid the locked state. There is a thing (refer patent document 1). In such a wiper device, by avoiding the locked state, it is possible to prevent a large current from continuously flowing through the wiper motor, thereby preventing heat generation and damage of the circuit and wasteful consumption of the power source.
JP 2001-095289 A

  However, when detecting the locked state in the wiper device described above, the driving is stopped, when the locked state is detected by an obstacle such as snow accumulated at the end within the entire wiping range on the window glass, Even when the entire wiping range is free of obstacles, the vehicle wiper remains stopped near the end within the entire wiping range. Therefore, after that, there is a problem that the wiping operation becomes impossible even in the wiping range other than the vicinity of the end portion (the area where snow has accumulated), and the driver's view cannot be secured. Further, since the vehicle wiper remains stopped in the vicinity of the end portion (intermediate position within the wiping range), the vehicle wiper itself may obstruct visibility.

  In addition, when the locked state in the wiper device described above is detected and a large torque is generated to avoid the locked state, when the obstacle is extremely heavy (for example, when snow is piled up thickly), the large torque is generated. However, the locked state cannot be avoided, and conversely, the circuit is liable to generate heat and damage, and wasteful power consumption increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wiper device that can prevent a large current from continuously flowing through the wiper motor and can further secure the driver's field of view. There is to do.

  According to the first aspect of the invention, there is provided a wiper device that wipes the windshield by reciprocatingly rotating the vehicle wiper connected to the output shaft by rotating the output shaft of the wiper motor forward and backward. And a controller that reduces the output of the wiper motor based on the detection of the restraint state of the vehicle wiper by an obstacle on the window glass, and then reversely drives the output shaft and the vehicle wiper.

  According to this configuration, during the wiping operation, the output shaft and the vehicle wiper are driven in reverse based on detection of a restraint state by an obstacle, so that a large current does not continue to flow through the wiper motor (the vehicle wiper is locked). As a result, heat generation and damage to the circuit can be prevented and wasteful consumption of power can be prevented. In addition, since the output shaft and the vehicle wiper are driven in reverse based on the detection of the restraint state by the obstacle, for example, the vehicle wiper is driven in the range until it is restrained by the obstacle, Can be wiped off. Further, for example, the vehicle wiper can be returned to a predetermined stop position (closed position), and the vehicle wiper can be prevented from being stopped at an intermediate position within the wiping range on the window glass. It becomes. Further, since the output of the wiper motor is reduced before the reverse drive, the force in the direction of pressing the obstacle can be removed (weakened), so that the movement when the vehicle wiper is driven reversely is smoothed. And so-called chattering can be reduced.

  According to a second aspect of the present invention, in the wiper device according to the first aspect, the control unit outputs the output of the wiper motor until the force in the direction of pressing the obstacle is substantially eliminated based on the detection of the restraint state. Then, the output shaft and the vehicle wiper are driven in reverse.

  According to this configuration, before the reverse driving, the output of the wiper motor is reduced until the force in the direction in which the obstacle is pressed is almost eliminated (substantially comes out completely). Smoother and so-called chattering is further reduced.

  According to a third aspect of the present invention, in the wiper device according to the first or second aspect, the control unit presses an obstacle with the vehicle wiper based on the detection of the restrained state, and then the wiper motor. Reduce the output of.

  According to the same configuration, for example, in order to reduce the output of the wiper motor after the obstacle is pressed by the vehicle wiper based on the detection of the restraint state, for example, while pushing the obstacle such as snow as much as possible, the claim 1 or The effect of the invention described in 2 can be obtained.

  According to a fourth aspect of the present invention, in the wiper device according to any one of the first to third aspects, the timing at which the control unit reversely drives the output shaft and the vehicle wiper is a normal value of the vehicle wiper. The virtual reversal timing is assumed to pass in the opposite direction during the reciprocating rotation of the motor, and the output of the wiper motor is reduced by the virtual reversal timing.

  According to this configuration, since the output shaft and the vehicle wiper are driven to reverse at a virtual reversal timing that is assumed to pass in the opposite direction during normal reciprocating rotation, for example, the timing of passing in the opposite direction during normal reciprocating rotation The vehicle wiper passes (crosses) the driver's field of view at substantially the same timing. Therefore, for example, the driver's uncomfortable feeling can be reduced.

  According to a fifth aspect of the present invention, in the wiper device according to the fourth aspect, the control unit sets the virtual inversion timing to the window when the vehicle wiper is normally reciprocated after the restraint state is detected. The time is set to twice the time until it is hypothesized to reach the end of the entire wiping range on the glass.

  According to this configuration, in a time twice as long as it is assumed that the vehicle wiper reaches the extreme end within the entire wiping range on the window glass at the time of normal reciprocating rotation of the vehicle wiper after the detection of the restraint state, Since the output shaft and the vehicle wiper are driven in reverse, the effect of the invention according to claim 4 can be obtained easily (by simple calculation).

  According to a sixth aspect of the present invention, in the wiper device according to any one of the first to fifth aspects, the controller allows the reversal permission condition based on the position of the vehicle wiper when the restraint state is detected. The output of the wiper motor is reduced only when the condition is satisfied, and then the output shaft and the vehicle wiper are driven to reverse. When the reverse prohibition condition based on the position of the vehicle wiper is satisfied, the output shaft and the vehicle wiper are Stop.

  According to this configuration, when the restraint state is detected, the output of the wiper motor is reduced only when the reversal permission condition based on the position of the vehicle wiper is satisfied, and then the output shaft and the vehicle wiper are reversed and driven. When the reverse prohibition condition based on the position is satisfied, the output shaft and the vehicle wiper are stopped. Therefore, unnecessary wiping operations such as when the driver's field of view that can be secured by the wiping operation is small even when the output shaft and the vehicle wiper are driven in reverse can be prevented by the reversal permission condition and the reversal prohibition condition. .

  According to a seventh aspect of the present invention, in the wiper device according to the sixth aspect, the control unit presses the obstacle with the vehicle wiper and then outputs the output shaft when the reversal prohibition condition is satisfied. And the vehicle wiper is stopped.

  According to this configuration, when the restraint state is detected and the inversion prohibition condition is satisfied, the obstacle, such as snow, is used to stop the output shaft and the vehicle wiper after pressing the obstacle with the vehicle wiper. The effect of the invention of claim 6 can be obtained while pushing out as much as possible.

  According to an eighth aspect of the present invention, in the wiper device according to the seventh aspect, the control unit stops the output shaft and the vehicle wiper and then presses the obstacle again with the vehicle wiper. The wiping operation is restarted.

  According to this configuration, after the output shaft and the vehicle wiper are stopped, the wiping operation is resumed in the direction in which the obstacle is pressed again by the vehicle wiper. Will be done. Therefore, obstacles such as snow can be pushed out as much as possible. Moreover, it is possible to prevent a large current from continuing to flow through the wiper motor, thereby preventing heat generation and damage to the drive circuit and preventing wasteful consumption of power.

  According to a ninth aspect of the present invention, in the wiper device according to any one of the first to eighth aspects, the control unit compares the current value flowing through the wiper motor with a preset constraint threshold value. The restraint state is detected.

  According to this configuration, since the restriction state is detected by comparing the current value flowing through the wiper motor with a preset restriction threshold value, it is directly monitored that a large current flows through the wiper motor (control). can do.

  ADVANTAGE OF THE INVENTION According to this invention, the wiper apparatus which can prevent that a heavy current continues flowing into a wiper motor, and can ensure a driver | operator's visual field can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, a wiper device 1 includes a wiper motor 11 provided near a lower end of a window glass 2 of a vehicle, and a vehicle wiper connected to an output shaft (not shown) of the wiper motor 11 to wipe the window glass 2. 12 and a controller (CPU) 13 as a control unit electrically connected to the wiper motor 11.

  The wiper motor 11 includes a motor body whose rotating shaft is rotated forward and backward by current supplied to the winding of the armature (see output duty in FIG. 3), and the rotation of the rotating shaft in the motor body is decelerated to the output shaft. A transmission speed reduction mechanism is integrally assembled, and further includes a rotation detection device for detecting the rotation direction, rotation speed, and rotation speed (see FIG. 3) of the rotation shaft.

  The vehicle wiper 12 according to the present embodiment is connected to the output shaft of the wiper motor 11 via a link mechanism (not shown), reciprocates when the output shaft rotates forward and backward, and the wiping range set on the window glass 2. Wipe H back and forth. The wiping range H is a range schematically shown by a two-dot chain line in FIG. 1 and includes a hatched portion. Further, in FIG. 1, the position of the left end in the wiping range H is a closed position H1 where the vehicle wiper 12 stops when normal (when the wiper is not driven), and the position of the right end in the wiping range H is normal in FIG. This is the open position H2 where the vehicle wiper 12 is reversed during the wiping operation (the wiping operation is not hindered).

  The controller 13 performs various controls such as supplying current to the wiper motor 11 to rotate the rotating shaft and thus the output shaft forward and backward based on the operation of the wiper switch in the driver's seat (not shown). Specifically, the controller 13 of the present embodiment causes the wiper motor 11 to match the rotation speed detected by the rotation detection device with the target rotation speed (see FIGS. 3 and 5) based on the operation of the wiper switch. A current is supplied (the output duty is controlled (PID control in this embodiment)). The target rotational speed includes an open direction in which the vehicle wiper 12 is directed toward the open position H2, and a closed direction in which the vehicle wiper 12 is directed toward the closed position H1 (see FIG. 3 and FIG. 3). (See FIG. 5). In FIGS. 3 and 5, the target rotational speed, the output duty, etc. are displayed in absolute values.

  Next, characteristic processing performed by the controller 13 of the present embodiment and characteristic operation of the wiper device 1 will be described with reference to the flowcharts shown in FIGS. 2 and 4 and the timing charts shown in FIGS. 3 and 5. To do.

The controller 13 always executes the flow (restraint process) shown in FIG. 2 during the wiping operation based on the operation of the wiper switch.
First, in step S1, the controller 13 determines whether or not the restraint state of the vehicle wiper 12 due to an obstacle on the window glass 2 is detected.

  Specifically, the controller 13 compares a current value (hereinafter referred to as a motor current) flowing through the wiper motor 11 (the armature winding) with a preset restriction threshold, and the motor current reaches the restriction threshold. If it is, it is determined that it is in a restraint state, and the restraint state is detected (a restraint state flag is set). After that, when the motor current falls below the lower limit restraint threshold set slightly lower than the restraint threshold, it is determined that the restraint state has been released and the unrestrained state is detected (the restraint state flag is cleared). The constraint threshold is a value set to protect the wiper motor 11 and the link mechanism based on the characteristics of the wiper motor 11 and the characteristics and rigidity of the link mechanism. The constraint threshold of the present embodiment takes into consideration the prevention of deformation of the link mechanism based on the fact that the drive of the vehicle wiper 12 becomes low torque and high torque due to the characteristics of the link mechanism in the vicinity of the close position H1 and the open position H2. And it has the link mechanism protection range L (refer FIG. 3) made into a low value, so that it goes to each of the close position H1 and the open position H2. The horizontal axis of FIG. 3 is time, but in the time zone A in which the position of the vehicle wiper 12 changes with time (the vehicle wiper 12 is not restrained), the link mechanism protection range becomes a lower value toward the closed position H1. L is shown in a visually easy-to-understand manner.

  When the controller 13 determines that it is in a restrained state and detects the restrained state (see timing t1 in FIG. 3 and timing t2 in FIG. 5), the controller 13 proceeds to step S2 and conversely determines that it is not in the restrained state. When the unconstrained state is detected, step S1 is repeated. FIG. 3 shows a state in which the motor current reaches the constraint threshold within the link mechanism protection range L at the constraint threshold.

In step S <b> 2, the controller 13 determines whether or not a reversal permission condition based on the position of the vehicle wiper 12 is satisfied (reverse prohibition condition).
Specifically, the controller 13 executes the flow (determination process) shown in FIG. That is, in step S21, the controller 13 determines whether or not the rotation direction of the rotation shaft (output shaft) corresponds to the open direction (closed direction). If the controller 13 determines that it corresponds to the open direction, the process proceeds to step S22. If the controller 13 determines that it does not correspond to the open direction (that is, corresponds to the close direction), the process proceeds to step S23.

  In step S22, the controller 13 determines whether or not the rotational speed (value corresponding to the position of the vehicle wiper 12) from the reference (for example, a value corresponding to the closed position H1) is within the reversal permission range at the time of opening. Determine. Here, the reversal permission range at the time of opening is a range H2a in the vicinity of the open position H2 within the wiping range H (a range indicated by hatching on the right side in FIG. 1, and in this embodiment, the entire wiping range H2 The range corresponding to approximately 20% of the above). The reversal permission range at the time of opening is set on the assumption that snow as an obstacle has accumulated near the open position H2. When the controller 13 determines that the rotation speed of the rotating shaft from the reference is within the reversal permission range at the time of opening (that is, when it is determined that the vehicle wiper 12 at the time of opening is within the range H2a), the process proceeds to step S24 and reversal. It determines with satisfy | filling permission conditions, and transfers to step S3 of FIG. If the controller 13 determines that the rotational speed of the rotating shaft from the reference is not within the reversal permission range at the time of opening (that is, determines that the vehicle wiper 12 at the time of opening is within the range excluding the range H2a), the process proceeds to step S25. Then, it is determined that the inversion prohibition condition is satisfied (the inversion permission condition is not satisfied), and the process proceeds to step S4 in FIG. In the present embodiment, the range corresponding to the range excluding the range H2a is set as the inversion prohibition range at the time of opening, and when the inversion permission condition is not satisfied, the inversion prohibition condition is set. Further, FIG. 3 illustrates a case where the rotation speed from the reference is within the reversal permission range at the time of opening at the timing t1 and the reversal permission condition is satisfied and the process proceeds to step S3. Further, in FIG. 5, at the timing t2, the rotation speed from the reference is not in the reversal permission range at the time of opening (in the reversal prohibition range at the time of opening), and does not satisfy the reversal permission condition (satisfies the reversal prohibition condition). The case of migration is illustrated.

  On the other hand, in step S23, the controller 13 determines whether the rotational speed of the rotating shaft (a value corresponding to the position of the vehicle wiper 12) from the reference (for example, a value corresponding to the closed position H1) is within the inversion permission range at the time of closing. Determine whether or not. Here, the inversion permission range at the time of closing is a range H1a in the vicinity of the closing position H1 within the wiping range H (the range indicated by the left hatching in FIG. 1, and in this embodiment, the entire wiping range H1 The range corresponding to approximately 20% of the above). The reversal permission range at the time of closing is set on the assumption that snow as an obstacle has accumulated near the closing position H1. Then, when the controller 13 determines that the rotation speed of the rotating shaft from the reference is within the inversion permission range at the close time (that is, when it is determined that the vehicle wiper 12 at the close time is in the range H1a), the process proceeds to step S24 and the inversion is performed. It determines with satisfy | filling permission conditions, and transfers to step S3 of FIG. If the controller 13 determines that the rotational speed of the rotating shaft from the reference is not within the reversal permission range at the time of closing (that is, determines that the vehicle wiper 12 at the time of closing is within the range excluding the range H1a), the controller 13 proceeds to step S25. Then, it is determined that the inversion prohibition condition is satisfied (the inversion permission condition is not satisfied), and the process proceeds to step S4 in FIG. In the present embodiment, the range corresponding to the range excluding the range H1a is set as the inversion prohibition range at the close time, and is set to satisfy the inversion prohibition condition when the inversion permission condition is not satisfied.

  In step S <b> 3, the controller 13 supplies current to the wiper motor 11 so that the vehicle wiper 12 presses the obstacle until the pressing end timing based on the virtual inversion timing. Here, the virtual inversion timing is a timing that is assumed to pass in the opposite direction when the vehicle wiper 12 is normally reciprocated (when not restrained by an obstacle). The pressing end timing is a timing at which the output of the wiper motor 11 can be reduced (remaining time) until the force in the direction of pressing the obstacle is substantially eliminated (substantially comes out) by the virtual inversion timing. It is. In other words, the pressing end timing is a time T during which the output of the wiper motor 11 can be reduced from the virtual reversal timing until the force in the direction of pressing the obstacle is almost eliminated (substantially comes out) (see FIG. 3). Is the timing of subtracting. When the vehicle wiper 12 presses an obstacle, control is performed so that the current (motor current) supplied to the wiper motor 11 substantially matches the constraint threshold. In this embodiment, the virtual inversion timing is set to be twice the time from when the restraint state is detected until when the vehicle wiper 12 reaches the open position H2 during normal reciprocating rotation. Is set. FIG. 3 shows a state (timing t3) in which the virtual inversion timing is determined at the timing t1 and the counter value (time) counted from the timing t1 reaches the virtual inversion timing. Further, FIG. 3 illustrates a case where the obstacle does not move (cannot be pushed out) even when pressed by the vehicle wiper 12. When the counter value (time) counted from the timing t1 reaches the pressing end timing (see timing t4 obtained by subtracting the time T from timing t3 reaching the virtual inversion timing in FIG. 3). The process proceeds to step S5. In this embodiment, there may be a case where there is no time until the pressing end timing after the restraint state is detected. In this case, the vehicle wiper 12 does not press the obstacle, and the process proceeds to step S5. Transition.

  In step S5, the controller 13 causes the wiper motor 11 to reduce the output of the wiper motor 11 until the force in the direction of pressing the obstacle is substantially eliminated (substantially comes out) by the virtual inversion timing (timing t3). Control the current supplied. Specifically, the controller 13 of the present embodiment controls the current value (motor current) flowing through the wiper motor 11 so as not to greatly exceed the constraint threshold. In step S5 (within the time T), By lowering the constraint threshold, the motor currents are substantially matched and lowered, thereby lowering the output of the wiper motor 11. Thereby, the force in the direction of pressing the obstacle is released. Then, when the counter value (time) counted from the timing t1 reaches the virtual inversion timing (see timing t3 in FIG. 3), the controller 13 proceeds to step S6.

  In step S <b> 6, the controller 13 supplies current to the wiper motor 11 so that the wiping operation is resumed in the direction opposite to the direction in which the vehicle wiper 12 presses the obstacle (that is, first reversely driven). FIG. 3 illustrates a state in which the target rotation speed (and rotation speed) is switched in the closing direction at timing t3. In FIG. 3, the above-described processing (steps S1, S2, S3, S5, S6) and operation are repeated, that is, the driving (reciprocating rotation) of the vehicle wiper 12 is repeated until the obstacle is restrained. This shows how the wind glass 2 is continuously wiped in the same range.

  On the other hand, in step S4, the controller 13 supplies a current to the wiper motor 11 so that the vehicle wiper 12 presses the obstacle until a preset output stop timing. In this case, control is performed so that the current (motor current) supplied to the wiper motor 11 substantially matches the constraint threshold. In addition, the preset output stop timing in the present embodiment is set to 1 [s] (see FIG. 5) after the restraint state is detected. FIG. 5 shows a state (timing t5) in which the counter value (time) counted from timing t2 reaches the output stop timing. Further, FIG. 5 illustrates a case where the obstacle does not move (cannot be pushed out) even when pressed by the vehicle wiper 12. Then, when the counter value (time) counted from timing t2 reaches the output stop timing (see timing t5 in FIG. 5), the controller 13 proceeds to step S7.

  In step S7, the controller 13 stops the supply of current to the wiper motor 11 until a preset restart timing. The preset restart timing in the present embodiment is set to 2 [s] (see FIG. 5) after the restraint state is detected. FIG. 5 shows a state (timing t6) in which the counter value (time) counted from timing t2 reaches the output stop timing. Then, when the counter value (time) counted from the timing t2 reaches the restart timing (see timing t6 in FIG. 5), the controller 13 proceeds to step S8.

  In step S <b> 8, the controller 13 supplies current to the wiper motor 11 so that the wiping operation is resumed in the direction in which the vehicle wiper 12 presses the obstacle again (at a preset restart timing). In FIG. 5, the above-described processing (steps S1, S2, S4, S7, S8) and operation are repeated, that is, a current is supplied to the wiper motor 11 to press the obstacle with the vehicle wiper 12, and the wiper motor 11 The state in which the supply of current to is repeatedly stopped is illustrated. Further, in the present embodiment, the number of times of step S8 is counted, and even if step S8 is performed five times (that is, even if steps S1, S2, S4, S7, and S8 are performed five times), the constraint is performed in step S1. When the state is detected, the supply of current to the wiper motor 11 is completely stopped (the wiping operation is not resumed) without proceeding to step S2.

Next, characteristic effects of the above embodiment will be described below.
(1) During the wiping operation, the output shaft of the wiper motor 11 and the vehicle wiper 12 are driven in reverse on the basis of detection of a restraint state by an obstacle such as a snowdrift that satisfies the reverse permission condition (the vehicle wiper is locked). It is possible to prevent a large current from continuously flowing through the wiper motor 11, thereby preventing heat generation and damage of the circuit and preventing wasteful consumption of electric power. In addition, since the output shaft of the wiper motor 11 and the vehicle wiper 12 are driven in reverse on the basis of detection of a restraint state by an obstacle such as a snowdrift that satisfies the reverse permission condition, the drive of the vehicle wiper 12 is restrained by the obstacle. The window glass 2 can be wiped in the same range, and the driver's field of view can be secured in the same range. Further, since the output of the wiper motor 11 is reduced before the reverse drive, the force in the direction of pressing the obstacle can be removed (weakened), so that the movement when the vehicle wiper 12 is driven reversely can be made smooth. So-called chattering and the like can be reduced.

  (2) Since the output of the wiper motor is reduced until the force in the direction of pressing the obstacle is almost eliminated (substantially comes out) before being driven in reverse, the movement when the vehicle wiper is driven in reverse becomes smoother. So-called chattering and the like are further reduced.

  (3) Since the wiping operation is resumed in the direction opposite to the direction in which the vehicle wiper 12 presses the obstacle based on the detection of the restraint state by an obstacle such as a snowdrift that satisfies the inversion permission condition, the vehicle wiper 12 This driving is repeated in the range until it is restrained by the obstacle, and it is possible to continue wiping on the window glass 2 in the same range.

  (4) Based on the detection of the restraint state by an obstacle such as a snowdrift that satisfies the reverse permission condition, the vehicle wiper 12 presses the obstacle and then reduces the output of the wiper motor 11. The obstacle can be pushed out as much as possible. Therefore, for example, the field of view of the secured driver can be made as wide as possible.

  (5) Since the output shaft of the wiper motor 11 and the vehicle wiper 12 are driven reversely at a virtual reversal timing that is assumed to pass in the opposite direction during normal reciprocating rotation (when not constrained by an obstacle), The vehicle wiper 12 passes (crosses) the driver's field of view at substantially the same timing as passing in the opposite direction during reciprocating rotation. Therefore, for example, the driver's uncomfortable feeling can be reduced. Moreover, the output can be reduced until the force in the direction of pressing the obstacle is almost eliminated by the end timing of the press (the virtual inversion timing) after the restraint state by the obstacle such as a snowdrift that satisfies the inversion permission condition is detected. Since the vehicle wiper 12 presses the obstacle until the driver's uncomfortable timing), the obstacle such as snow can be pushed out as much as possible while reducing the driver's uncomfortable feeling.

  (6) The virtual inversion timing is assumed to be virtual when reaching the extreme end (open position H2 or close position H1) in the wiping range H during the normal reciprocating rotation of the vehicle wiper 12 after the restraint state is detected. Therefore, the virtual inversion timing can be easily set (by a simple calculation).

  (7) When the restraint state is detected, the output of the wiper motor 11 is reduced only when the reversal permission condition based on the position of the vehicle wiper 12 is satisfied, and then the output shaft of the wiper motor 11 and the vehicle wiper 12 are driven to reverse. When the reverse prohibition condition based on the position of the vehicle wiper 12 is satisfied, the output shaft of the wiper motor 11 and the vehicle wiper 12 are stopped. Therefore, for example, when the driver's field of view that can be secured by the wiping operation is small even if the output shaft of the wiper motor 11 and the vehicle wiper 12 are driven in reverse by the reversal permission condition and the reversal prohibition condition (the vehicle wiper 12 when open is in the range) Unnecessary wiping operations such as a range excluding H2a, for example, at the center position of the wiping range H) can be prevented. Of course, even when the output shaft of the wiper motor 11 and the vehicle wiper 12 are stopped, it is possible to prevent a large current from continuing to flow through the wiper motor 11, thereby preventing heat generation and damage of the circuit and wasting power consumption. Can be prevented. In this embodiment, the reversal permission condition and the reversal prohibition condition are set according to the rotation direction and rotation speed (rotation speed from the reference) of the rotation shaft (output shaft). It can be easily determined.

  (8) When the restraint state is detected and the inversion prohibition condition is satisfied, the obstacle is pressed by the vehicle wiper 12 until the preset output stop timing, and then the output shaft of the wiper motor 11 and the vehicle wiper 12 are stopped. Therefore, for example, obstacles, such as snow, can be pushed out as much as possible.

  (9) After the output shaft of the wiper motor 11 and the vehicle wiper 12 are stopped, the wiping operation is resumed in the direction in which the obstacle is pressed by the vehicle wiper 12 again (at a preset restart timing). The operation of pushing out obstacles such as is performed a plurality of times. Therefore, obstacles such as snow can be pushed out as much as possible. Further, in this embodiment, when a restraint state is detected even if the operation of pushing out an obstacle such as snow is performed five times, the supply of current to the wiper motor 11 is completely stopped (the wiping operation is not resumed). Therefore, it is possible to prevent wasteful consumption of electric power when it is predicted that it is difficult to push out an obstacle such as snow.

  (10) Since a restraint state is detected by comparing a current value (motor current) flowing through the wiper motor 11 with a preset restraint threshold, it is directly monitored that a large current flows through the wiper motor 11 and is accurately prevented ( Control).

  (11) The controller 13 controls the current value (motor current) flowing through the wiper motor 11 so as not to greatly exceed the constraint threshold. Then, since the motor current is reduced substantially in accordance with the reduction of the constraint threshold, and the output of the wiper motor 11 is thereby reduced, the output of the wiper motor 11 can be controlled easily and reliably.

The above embodiment may be modified as follows.
In the above embodiment, the inversion permission condition and the inversion prohibition condition are set according to the rotation direction and rotation speed (rotation speed from the reference) of the rotation shaft (output shaft) (see FIG. 4). For example, the speed may be set according to the rotation speed and time (counter value) of the rotation shaft (output shaft). For example, the flow (determination process) shown in FIG. 4 may be changed to the flow (determination process) shown in FIG.

  Specifically, in step S26, the controller 13 determines a counter value (different from the counter values shown in FIGS. 3 and 5) from when the rotational speed of the rotating shaft (output shaft) is zero until the restraint state is detected. Then, it is determined whether or not it is within the inversion permission range. That is, in this example, since the rotational speed of the rotating shaft becomes 0 at both the closed position H1 and the open position H2, counting starts from that point, and the counter value (time) when the restraint state is detected is Judgment is made based on whether or not it is expected to reach the ranges H1a and H2a. Even in this case, it is possible to easily determine whether or not each condition is satisfied.

  In the above embodiment, the output of the wiper motor is reduced until the force in the direction in which the obstacle is pressed is almost eliminated (substantially comes out) before the inversion drive is performed. If the force in the direction in which the obstacle is pressed before is removed as much as possible (even if it is not completely removed), the output of the wiper motor may be reduced as such.

  In the above embodiment, the wiping operation is resumed in the direction opposite to the direction in which the vehicle wiper 12 presses the obstacle based on the detection of the restraint state by the obstacle such as a snowdrift that satisfies the reverse permission condition. However, the present invention is not limited to this. For example, the vehicle wiper 12 may be driven in a reverse direction based on detection of a restrained state by an obstacle such as a snowdrift that satisfies the reverse permission condition. In this case, for example, the vehicle wiper 12 may be reversely driven to the closed position H1 and stopped, and may not be driven until the wiper switch is operated again.

  In the above embodiment, the output of the wiper motor 11 is reduced after the obstacle is pressed by the vehicle wiper 12 based on the detection of the restraint state by an obstacle such as a snowdrift that satisfies the reverse permission condition. However, the present invention is not limited to this, and the output of the wiper motor 11 may be reduced without pressing an obstacle, and then driven in reverse.

  In the above embodiment, the output shaft of the wiper motor 11 and the vehicle wiper 12 are driven in reverse at the virtual inversion timing that is assumed to pass in the opposite direction during normal reciprocating rotation (when not constrained by an obstacle). The wiping operation is resumed in the direction), but is not limited to this, and may be driven in reverse at other timings. For example, the inversion drive may be performed at a preset timing such as 1 [s] after the restraint state is detected. Of course, even in this case, it is necessary to reduce the output of the wiper motor 11 and remove the force in the direction of pressing the obstacle before the reverse driving.

  Further, the virtual inversion timing may be calculated and set at any time (repeatedly even when the obstacle is pressed), and the output shaft and the vehicle wiper may be driven to invert at the virtual inversion timing. In this way, for example, even when the obstacle moves due to the pressing of the obstacle, the driver's field of view can be passed with high accuracy and substantially the same timing as the passage in the opposite direction during normal reciprocating rotation.

  In the above embodiment, the output shaft of the wiper motor 11 and the vehicle wiper 12 are stopped when the restraint state is detected and the reverse prohibition condition based on the position of the vehicle wiper 12 is satisfied. However, the present invention is not limited to this. For example, the output shaft of the wiper motor 11 and the vehicle wiper 12 may be driven in reverse whenever a restraint state is detected. In this case, instead of resuming the wiping operation in the opposite direction, in order to prevent unnecessary wiping operation (reciprocating rotation) such as when the driver's field of view that can be secured by the wiping operation is small, As in another example, it is preferable that the vehicle wiper 12 is only driven to reverse (for example, only driven to reverse to the closed position H1 and stopped).

  In the above embodiment, when the restraint state is detected and the reversal prohibition condition is satisfied, after the obstacle is pressed by the vehicle wiper 12 until the preset output stop timing, the output shaft of the wiper motor 11 and the vehicle wiper are However, the present invention is not limited to this, and may be stopped without pressing an obstacle.

  In the above embodiment, after the output shaft of the wiper motor 11 and the vehicle wiper 12 are stopped, the wiping operation is resumed in the direction in which the obstacle is pressed by the vehicle wiper 12 again (at a preset restart timing). However, the present invention is not limited to this, and the wiping operation may not be resumed after stopping. In the above embodiment, even if step S8 is performed five times, if the restraint state is detected in step S1, the supply of current to the wiper motor 11 is completely stopped (the wiping operation is not resumed). However, the present invention is not limited to this, and the wiping operation (pressing) may be continued until the wiper switch is operated (off). Of course, the number of times that the wiping operation is not restarted may be changed from 5 times to another number (for example, 10 times).

  In the above embodiment, the restraint state is detected by comparing the current value (motor current) flowing through the wiper motor 11 with a preset restraint threshold value. However, if the restraint state can be detected, other methods can be used. You may change to

  In the above-described embodiment, the motor current is substantially matched and lowered by lowering the constraint threshold, thereby reducing the output of the wiper motor 11. However, the output of the wiper motor 11 is lowered and the obstacle is pressed. If the direction force can be removed, other methods may be used.

  In the above embodiment, the constraint threshold value has the link mechanism protection range L. However, the constraint threshold value is not limited to this, and the constraint threshold value may be changed to a constraint threshold value set by another law. For example, the threshold value may be changed to a constraint threshold that constantly changes according to the position of the vehicle wiper 12 (lower values become closer to the closed position H1 and the open position H2). Further, when the vehicle wiper 12 is fixed directly to the output shaft of the wiper motor 11 without providing the link mechanism, it is desirable to change to a fixed constraint threshold value that does not have the link mechanism protection range L.

  In the above embodiment, the output stop timing is set to 1 [s] after the restraint state is detected, and the restart timing is set to 2 [s] after the restraint state is detected. Of course, the timing may be changed.

  In the above embodiment, the range H1a in the vicinity of the close position H1 and the range H2a in the vicinity of the open position H2 are both ranges corresponding to approximately 20% of the total wiping range H, but are not limited thereto. In addition, as the range corresponding to approximately 30% of the total wiping range H, the inversion permission range at the time of closing and opening may be set.

  In the above embodiment, the same processing (the flow shown in FIG. 2) is performed both when driving the vehicle wiper 12 in the open direction and when driving the vehicle wiper 12 in the closing direction. Instead, the flow shown in FIG. 2 may be executed only when the vehicle wiper 12 is driven in the open direction.

The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.
(A) In the wiper device according to claim 4, the control unit causes the vehicle wiper to press the obstacle until the pressing end timing after the restraint state is detected, and the pressing end timing is the virtual inversion. A wiper device characterized in that the timing is such that the output of the wiper motor can be reduced until the force in the direction of pressing the obstacle is substantially eliminated by the timing.

According to this configuration, for example, an obstacle such as snow can be pushed out as much as possible while obtaining the effects of the inventions according to claims 2 to 4.
(B) In the wiper device according to claim 6, the reversal permission condition and the reversal prohibition condition are set according to a rotation direction of the output shaft and a rotation speed of the wiper motor (rotation speed from a reference). Wiper device.

According to this configuration, the effect of the invention according to claim 6 can be easily obtained.
(C) The wiper device according to claim 6, wherein the reversal permission condition and the reversal prohibition condition are set by a rotation speed and a time (counter value) of the output shaft.

According to this configuration, the effect of the invention according to claim 6 can be easily obtained.
(D) The wiper device according to any one of 1 to 9 and (a) to (c), wherein the control unit wipes the wiper in a direction opposite to a direction in which an obstacle is pressed by the vehicle wiper. A wiper device that performs the inversion driving by resuming the operation.

  According to this configuration, since the wiping operation is resumed in the direction opposite to the direction in which the obstacle is pressed by the vehicle wiper based on the detection of the restraint state, the driving until the vehicle wiper is restrained by the obstacle. It can be repeated in the range and continue to wipe on the wind glass in the same range.

  (E) In the wiper device according to any one of claims 1 to 9 and (a) to (d) above, the control unit may prevent the current value flowing through the wiper motor from greatly exceeding the constraint threshold. And a wiper device that reduces the output of the wiper motor by lowering the restriction threshold based on detection of the restriction state.

  According to this configuration, the control unit controls the current value flowing through the wiper motor so as not to greatly exceed the constraint threshold value, and the control unit flows to the wiper motor by reducing the constraint threshold value based on detection of the constraint state. Since the current value is reduced and the output of the wiper motor is thereby reduced, the control of the output of the wiper motor becomes easy and reliable.

The schematic diagram of the window glass and wiper apparatus in this Embodiment. The flowchart for demonstrating the process for the time of restraint of the controller of this Embodiment. The timing chart for demonstrating the process at the time of restraint of this Embodiment. The flowchart for demonstrating the determination process of the controller of this Embodiment. The timing chart for demonstrating the process at the time of restraint of this Embodiment. The flowchart for demonstrating the determination process of the controller of another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Window glass, 11 ... Wiper motor, 12 ... Vehicle wiper, 13 ... Controller (control part), H ... Wiping range.

Claims (9)

A wiper device that wipes the windshield by rotating a vehicle wiper connected to the output shaft by rotating the output shaft of the wiper motor forward and backward,
A controller that reduces the output of the wiper motor based on detection of a restraint state of the vehicle wiper by an obstacle on the window glass during wiping operation, and then reversely drives the output shaft and the vehicle wiper; Wiper device characterized by. The wiper device according to claim 1,
The control unit reduces the output of the wiper motor until the force in the direction of pressing the obstacle is almost eliminated based on the detection of the restrained state, and then reversely drives the output shaft and the vehicle wiper. Wiper device. The wiper device according to claim 1 or 2,
The said control part reduces the output of the said wiper motor, after pressing an obstruction with the said vehicle wiper based on the detection of the said restraint state, The wiper apparatus characterized by the above-mentioned. The wiper device according to any one of claims 1 to 3,
The timing at which the control unit reversely drives the output shaft and the vehicle wiper is a virtual inversion timing that is assumed to pass in the opposite direction during normal reciprocating rotation of the vehicle wiper. A wiper device that reduces the output of the wiper motor. The wiper device according to claim 4, wherein
The control unit until the virtual reversal timing is hypothesized when reaching the extreme end within the entire wiping range on the window glass during the normal reciprocating rotation of the vehicle wiper after the restraint state is detected. A wiper device characterized in that the time is set to twice the time. The wiper device according to any one of claims 1 to 5,
When the restraint state is detected, the control unit reduces the output of the wiper motor only when a reversal permission condition based on the position of the vehicle wiper is satisfied, and then reversely drives the output shaft and the vehicle wiper. A wiper device that stops the output shaft and the vehicle wiper when a reverse prohibition condition based on the position of the vehicle wiper is satisfied. The wiper device according to claim 6, wherein
When the reversal prohibition condition is satisfied, the control unit stops the output shaft and the vehicle wiper after pressing an obstacle with the vehicle wiper. The wiper device according to claim 7, wherein
The control unit, after stopping the output shaft and the vehicle wiper, restarts the wiping operation again in a direction in which an obstacle is pressed by the vehicle wiper. The wiper device according to any one of claims 1 to 8,
The said control part detects the said restraint state by comparing the electric current value which flows into the said wiper motor, and the preset restraint threshold value, The wiper apparatus characterized by the above-mentioned.

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