JP2006117149A - Wiper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper device capable of reducing inversion sound generated at an inversion position of the wiper blade as a whole during reciprocation wiping action of the wiper blade. <P>SOLUTION: The wiper device S is provided with a plurality of wiper blades 10a, 10b for performing the reciprocation wiping action between first inversion positions (A1, B1) and second inversion positions (A2, B2). The wiper blades 10a, 10b are driven at at least the first inversion position or the second inversion position such that respective inversion timings are different from each other. A control part controls a driving part so as to reduce a wiping speed of the respective wiper blades near at least the first inversion position or the second inversion position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wiper device, and more particularly, to a wiper device that can reduce noise generated during a reciprocating wiping operation of a wiper blade.

Conventionally, a vehicle is equipped with a wiper device that reciprocates a plurality of wiper blades to wipe the window glass. In such a wiper device, when the advancing direction of the wiper blade is switched at both ends of the wiping area of the wiper blade, a reversing sound is generated in which the blade rubber hits the window glass.
As a technique for reducing such reversal noise, a wiper device that reduces the wiping speed of the wiper blade near the reversal position has been proposed (see, for example, Patent Document 1). In the wiper device described in Patent Document 1, a connection lever that reciprocates a wiper arm around a support shaft is provided with a mechanism that changes the rotation speed of the connection lever. Accordingly, the wiping speed when the wiper blade reaches the stop position or the reverse position can be made slower than the wiping speed when the vicinity of the intermediate position between the stop position and the reverse position is being wiped. The degree to which the blade rubber hits the window glass at the time of reversal is weakened, and the reversal sound is reduced.

JP-A-5-238356 (pages 2 to 4, FIGS. 1 to 3)

However, in the wiper device described in Patent Document 1, although the inverted sound generated from each wiper blade is reduced, a plurality of wiper blades generate the inverted sound almost simultaneously. There was a risk of discomfort to the driver.
In view of the above problems, an object of the present invention is to provide a wiper device that can further reduce the reversal sound generated at the reversal position of the wiper blade during the reciprocating wiping operation of the wiper blade.

  According to the present invention, there is provided a wiper device including a plurality of wiper blades that perform a reciprocating wiping operation between a first inversion position and a second inversion position, wherein the plurality of wiper blades are at least first This is solved by being driven so that the respective inversion times are different at the inversion position or the second inversion position.

  As described above, in the wiper device of the present invention, the plurality of wiper blades are driven so as to be reversed at different times of reversal at least at the first reversal position or the second reversal position. Thereby, since the generation time of the reversal sound of each wiper blade can be made different, the level of noise generated from the wiper device along with the reversal can be reduced.

  Further, according to the present invention, there is provided a wiper device including a plurality of wiper blades that perform a reciprocating wiping operation between a first inversion position and a second inversion position, wherein the wiper arm supports each of the wiper blades. And a controller that controls the drive unit so that the reversal timing of the wiper blade is different at least at the first reversal position or the second reversal position. The

  As described above, in the wiper device of the present invention, the drive unit that performs the reciprocating wiping operation of the plurality of wiper blades is controlled by the control unit so that the reversal timing of each wiper blade is different at least at the first reversal position or the second reversal position. . Thereby, since the generation time of the reversal sound of each wiper blade can be made different, the level of noise generated from the wiper device along with the reversal can be reduced.

  Further, it is preferable that the control unit controls the driving unit so as to reduce the wiping speed of each wiper blade at least in the vicinity of the first inversion position or the second inversion position. Thus, the reversal when the wiper blade is reversed at the reversing position by the control unit controlling the drive unit so as to reduce the wiping speed of the wiper blade at least in the vicinity of the first reversing position or the second reversing position. The sound level can be reduced.

  The wiper arm is connected to a connection lever that reciprocates the wiper arm about a support shaft, and the connection lever is configured such that when the wiper arm reciprocates, the wiper blade is at least in a first inversion position or a second position. Preferably, the wiper blade is connected to the drive unit via a rotation speed adjusting mechanism that changes the rotation speed of the connection lever so as to reduce the wiping speed of the wiper blade when reaching the vicinity of the reversal position. Thus, by connecting the drive unit and the wiper arm via the rotation speed adjustment mechanism, the wiper blade supported by the wiper arm has a reduced wiping speed at least near the first reverse position or the second reverse position. Therefore, the level of the reverse sound generated at the reverse position can be reduced.

  In addition, it is preferable that the control unit controls the drive unit so that a driver-side wiper blade among the plurality of wiper blades is operated quickly from a state where the drive unit is stopped. By configuring in this way, the driver can secure a good field of view earlier.

  Further, vibration isolating means is disposed at least on a portion of the window glass corresponding to the first inversion position or the second inversion position, the wiper arm, or at least a portion in contact with the wiper arm at the first inversion position or the second inversion position. Is preferred. By providing the anti-vibration means in this way, it is possible to attenuate the vibration accompanying the reversal of the wiper blade, so that the reversal sound can be reduced.

According to the wiper device of the present invention, the reciprocating wiping operation of each wiper blade is driven so that the reversal timings of the plurality of wiper blades are different from each other. Avoided. Thereby, the noise level generated when the wiper device is operated can be reduced as a whole.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the members, arrangements, and the like described below do not limit the present invention, and it is needless to say that various modifications can be made in accordance with the spirit of the present invention.
1 to 5 relate to an embodiment of the present invention, FIG. 1 is an explanatory diagram of a wiper device, FIG. 2 is an explanatory diagram of vibration isolation means, FIG. 3 is an explanatory diagram of an operation of the wiper device, and FIG. Is an explanatory diagram of the wiping speed of the wiper device, and FIG. 5 is a flowchart of the operation procedure of the wiper device.
6 to 8 relate to another embodiment of the present invention, FIG. 6 is a flowchart of the operation procedure of the wiper device, FIG. 7 is an explanatory view of the vibration isolating means, and FIG. 8 is an explanatory view of the wiper device. .

  The wiper device S of this example wipes the front window glass 1 of the vehicle in a reciprocating manner, and supports the wiper blades 10a and 10b and the wiper blades 10a and 10b for wiping the surface of the window glass 1 as shown in FIG. The main components are the wiper arms 11a and 11b, the motor units 20a and 20b as drive units for reciprocating the wiper arms 11a and 11b, the control unit 30 for controlling the drive of the motor units 20a and 20b, and the operation switch 40. Yes.

In the wiper device S of this example, the plurality of wiper blades 10a and 10b are configured to wipe the surface of the window glass 1 in a reciprocating manner. The wiper device S of this example is configured to include two wiper blades, but is not limited to this, and may be three or more. Further, in this example, the wiper device S is for wiping the surface of the front window glass 1, but is not limited thereto, and can be applied to various types of vehicle windows.
In addition, the wiper device S of this example includes motor units 20a and 20b, which are dedicated drive sources, for reciprocating the wiper blade 10a, the wiper arm 11a, the wiper blade 10b, and the wiper arm 11b, respectively.

The wiper blade 10a reciprocates the substantially fan-shaped wiping area 2a between the first inversion position (stop position) A1 and the second inversion position A2. Further, the wiper blade 10b reciprocates the substantially fan-shaped wiping region 2b between the first reverse position (stop position) B1 and the second reverse position B2.
The base ends of the wiper arms 11a and 11b are connected to output shafts 21a and 21b of motor units 20a and 20b that can rotate forward and backward, respectively. The wiper arms 11a and 11b are configured to swing around the output shafts 21a and 21b when the output shafts 21a and 21b are rotated in the forward and reverse directions by the forward and reverse rotations of the motor units 20a and 20b.
The motor units 20a and 20b are configured to include an electric motor and a speed reduction mechanism. The motor units 20 a and 20 b include rotation amount detection sensors 22 a and 22 b that send the rotation amount to the control unit 30, respectively. The rotation amount detection sensors 22 a and 22 b are configured by a magnet attached to the Hall IC and the rotor of the electric motor, and send a pulse signal (rotation signal) to the control unit 30 according to the rotation of the rotor.

The motor unit 20a incorporates a reverse position detection switch 23a that detects the rotational positions of the wiper blade 10a and the wiper arm 11a when the wiper blade 10a reaches the first reverse position A1 and the second reverse position A2. When the first reverse position A1 and the second reverse position A2 are detected, the reverse position detection switch 23a sends a reverse position detection signal to the control unit 30. Similarly, a reverse position detection switch 23b that detects the first reverse position B1 and the second reverse position B2 and sends a reverse position detection signal to the control unit 30 is incorporated in the motor unit 20b.
In this example, the rotation amount detection sensors 22a and 22b and the reverse position detection switches 23a and 23b are provided in the motor units 20a and 20b, respectively. However, the present invention is not limited thereto, and is provided outside the motor units 20a and 20b. It may be done. Further, if the rotation positions of the wiper blades 10a and 10b and the wiper arms 11a and 11b can be detected by the rotation amount detection sensors 22a and 22b and the reverse position detection switches 23a and 23b as in this example, the sensor and the switch are used. It is not limited to things. For example, the rotation angle of the wiper arms 11a and 11b may be detected.

The control unit 30 is mounted in the vehicle and includes a CPU, a memory, and the like. Upon receiving an operation signal from the operation switch 40, the control unit 30 sends a drive signal to the motor units 20a and 20b and controls the wiper blades 10a and 10b to perform a reciprocating wiping operation in a predetermined sequence.
When the control unit 30 receives a pulse signal (rotation signal) representing the rotation amount from the rotation amount detection sensors 22a and 22b, the control unit 30 counts up or down the number of pulses according to forward and reverse rotation, and wiper blade 10a, wiper arm 11a, wiper The rotational positions of the blade 10b and the wiper arm 11b are monitored. Specifically, when rotating the wiper blade in the direction from the first reversal position to the second reversal position, the control unit 30 sends a drive signal for normal rotation to the motor units 20a and 20b, and a pulse signal. It counts up every time it is received. On the other hand, when the wiper blade is rotated in the direction from the second reversal position to the first reversal position, a drive signal for reverse rotation is sent out and counts down every time a pulse signal is received. In this way, the control unit 30 can monitor the rotational positions of the wiper blades 10a and 10b.

  Further, the control unit 30 controls the rotation speed of the motor units 20a and 20b by changing the duty ratio of the drive voltage sent to the motor units 20a and 20b. In the wiper device S of this example, the duty ratio of the drive voltage sent to the motor units 20a and 20b is lowered near the reversal position so as to reduce the wiping speed of the wiper blades 10a and 10b near the reversal position.

As shown in FIG. 2A, in the wiper device S of the present example, the anti-vibration means as the anti-vibration means is respectively provided along the first inversion position A1 and the second inversion position A2 corresponding to the sides of both ends of the wiping area 2a. Vibrating materials 51a and 51b are disposed. Further, anti-vibration materials 52a and 52b as anti-vibration means are disposed along the first inversion position B1 and the second inversion position B2 corresponding to the sides of the both ends of the wiping area 2b.
The anti-vibration materials 51a, 51b, 52a, 52b of this example are formed in a narrow band shape, and are attached to the inner surface of the window glass 1 (see FIG. 2B). This anti-vibration material is formed of a substantially transparent material so as not to disturb the driver's view. The anti-vibration material of this example is formed of a material mainly composed of silicon rubber cured to a predetermined hardness so that vibration can be attenuated. Further, the present invention is not limited to this, and for example, a structure in which a gel-like external material made of silicon is covered with a substantially transparent resin material may be used. Further, the material is not limited to silicon rubber, and other materials may be used.

By such anti-vibration materials 51a, 51b, 52a and 52b, when the wiper blades 10a and 10b are reversed and the blade rubber hits the surface of the window glass 1, the shock and vibration transmitted to the window glass 1 are attenuated. Therefore, the noise generated when the wiper device S is operated can be reduced as a whole.
Further, in this example, the vibration isolator is disposed on the inner side surface of the window glass 1, but the present invention is not limited to this, and it may be configured as shown in FIG. That is, in the example of FIG. 2C, the window glass 1 is a laminated glass obtained by bonding two outer glasses 1a and an inner glass 1b, and grooves 1c and 1d are formed on the mating surfaces of the outer glass 1a and the inner glass 1b. Is formed. And the vibration isolator 51a is arrange | positioned in the space formed by these groove parts 1c and 1d. As described above, the vibration isolating material may be disposed inside the window glass 1.

Next, the operation of the wiper device S of this example will be described based on FIG.
The wiper device S of this example is configured to operate so that the time when the plurality of wiper blades 10a and 10b are reversed at the first inversion positions A1 and B1 and the second inversion positions A2 and B2 is different. In addition, the operation time required for the wiper blades 10a and 10b for one cycle of the reciprocating wiping operation is set to be substantially the same.
FIG. 3A shows a state where the wiper blades 10a and 10b are stopped at the first inversion positions A1 and B1, respectively. When the wiper device S is operated by the operation switch 40 from this stopped state, the wiper blade 10a on the driver's seat side starts to rotate as shown in FIG. 3B. When the wiper blade 10a rotates to a predetermined rotation angle, the wiper blade 10b also starts to rotate as shown in FIG.

  FIG. 3D shows a state where the preceding wiper blade 10a has reached the second inversion position A2. At this time, the wiper blade 10b wipes the position before the second reversal position B2. When the wiper blade 10a reaches the second inversion position A2, the wiping direction is inverted in the direction of the first inversion position A1. As shown in FIG. 3E, when the wiper blade 10a rotates from the second reversal position A2 to the first reversal position A1 in the direction of the first reversal position A1 to a predetermined rotation angle, the wiper blade 10b reaches the second reversal position B2. To do.

  When the wiper blade 10b reaches the second reversal position B2, the wiping direction is reversed in the direction of the first reversal position B1 (FIG. 3F). As shown in FIG. 3G, when the wiper blade 10a reaches the first reverse position A1, the wiper blade 10b wipes the position before the second reverse position B1. When the wiper blade 10a reaches the first reversal position A1, the wiping direction is reversed in the direction of the second reversal position A2. As shown in FIG. 3 (H), when the wiper blade 10a is moving to the second reversal position A2, the wiper blade 10b reaches the first reversal position B1. When the wiper blade 10b reaches the first reverse position B1, the wiper blade 10b reverses the wiping direction toward the second reverse position B2. Thereafter, the wiper blades 10a and 10b perform the reciprocating wiping operation by repeating FIGS. 3 (B) to 3 (H).

As described above, the wiper device S of the present example operates so that the wiper blades 10a and 10b are reversed at the first inversion positions A1 and A2 and the second inversion positions A2 and B2. Thereby, since the reverse sound generated when the wiper blades 10a, 10b are reversed is generated at different times, the reverse sound is dispersed without being overlapped, so that the noise generated during the wiping operation of the wiper device S as a whole is reduced. The level can be reduced.
Further, in the wiper device S of the present example, the wiper blade 10a on the driver's seat side starts wiping ahead of the wiper blade 10b on the passenger seat side, so that the driver can secure a good field of view earlier.

FIG. 4 is an explanatory diagram showing an outline of the temporal change in the rotational speed of the wiper arms 11a and 11b driven by the motor unit 20a (motor 1) and the motor unit 20b (motor 2). In addition, this rotational speed is substantially proportional to the wiping speed of the wiper blades 10a and 10b. As can be seen from FIG. 4, the wiper arm 11 b on the passenger seat side is separated by a time ta after the wiper arm 11 a on the driver seat side starts moving in the forward direction (direction from the first reverse position A1 to the second reverse position A2). After the elapse of time, movement in the positive direction (direction from the first reverse position B1 to the second reverse position B2) is started. Further, the wiper arm 11b reaches the second inversion position B2 after the time tb has elapsed since the wiper arm 11a reached the second inversion position A2. Thus, the wiper arms 11a and 11b reach the reversal position with a predetermined time interval.
The wiper arm 11a has a low rotation speed in the vicinity of the first reverse position A1, and gradually increases as it approaches an intermediate position between the first reverse position A1 and the second reverse position A2. Then, the high speed state is maintained in the vicinity of the intermediate position, and then the speed is decreased again to the low speed state as the second reversal position A2 is approached.

The wiper arm 11a is temporarily stopped because the rotation direction is reversed at the second reversing position A2, and then stopped in the reverse direction (the direction from the second reversing position A2 to the first reversing position A1 or the first reversing position B2 to the first reversing position B2). The movement starts in the direction toward the reversal position B1. When moving in the reverse direction, the rotation speed is low in the vicinity of the second reverse position A2, high in the intermediate position, and low in the vicinity of the first reverse position A1.
Similarly to the wiper arm 11a, the wiper arm 11b rotates at a low speed in the vicinity of the first reverse position B1 and the second reverse position B2, regardless of the forward and reverse directions, and at a high speed in the vicinity of the intermediate position. .

  In the wiper device S of this example, such a change in the rotational speed of the wiper arms 11a and 11b is driven by the control unit 30 to be sent to the motor units 20a and 20b in accordance with the rotational position of the wiper blades 10a and 10b. This is done by changing the duty ratio of the voltage. That is, the control unit 30 monitors the rotation positions of the wiper arms 11a and 11b by the rotation signal and the reverse position detection signal sent from the motor units 20a and 20b as described above, as shown in FIG. When the wiper blades 10a and 10b are in the vicinity of the reversal position, a drive signal having a low duty ratio is transmitted, and when the wiper blades 10a and 10b are in the vicinity of the intermediate position, a drive signal having a high duty ratio is transmitted. Accordingly, the motor units 20a and 20b can rotate the wiper arms 11a and 11b at a rotation speed corresponding to the duty ratio.

Next, the processing procedure of the control unit 30 will be described according to the flowchart of FIG. Before starting the operation, the wiper blades 10a and 10b are stopped at the stop positions (first inversion positions A1 and B1).
When starting the operation, the control unit 30 reads the initial setting (step S1). In the initial setting, for the wiper blade 10a, the count number S1 based on the rotation signal from the rotation amount detection sensor 22a is set to “0” at the first inversion position A1 and “N1” at the second inversion position A2. For the wiper blade 10b, the count number S2 is set to “0” at the first inversion position B1 and “N2” at the second inversion position B2. Further, the motor 2 (motor unit 20b) is set to start when the count number S1 reaches “M2”.

The operation flag FL is set according to the switch position of the operation switch (wiper switch) 40. The operation flag FL is “0” or “ON” (operation when the operation switch 40 is “OFF” (stop position). (Position) is “1”.
Note that the control unit 30 confirms that the wiper blades 10a and 10b are at the first reverse position based on detection signals from the reverse position detection switches 23a and 23b at the time of initial setting.

  After the initial setting, the switch position of the operation switch 40 is determined (step S2). When the operation switch 40 is “OFF” (step S2; OFF), step S2 is repeated. On the other hand, when the operation switch 40 is “ON” (step S2; NO), the process proceeds to step S3, where the count numbers S1 and S2 are both “0” (that is, both wiper blades 10a and 10b are at the stop position). ). When both the count numbers S1 and S2 are “0”, the operation switch 40 is set to the operation position from the stop state, and a drive signal in the forward rotation direction is sent to the motor unit 20a, so that the wiper blade 10a is moved. Move in the forward direction (step S4). When the motor unit 20a rotates forward, a rotation signal is sent from the rotation amount detection sensor 22a. Accordingly, the control unit 30 counts up the count number S1 and monitors the rotation amount.

Then, it is determined whether or not the count number S1 is equal to or greater than the set value M2 (step S5). When the count number S1 is less than M2 (step S5; NO), step S5 is repeated. On the other hand, when the count number S1 becomes M2 or more (step S5; YES), a drive signal in the forward rotation direction is sent to the motor unit 20b, and the wiper blade 10b is moved in the forward direction (step S6). When the motor unit 20b rotates forward, a rotation signal is sent from the rotation amount detection sensor 22b. Accordingly, the control unit 30 counts up the count number S2 and monitors the rotation amount.
Thus, even if the wiper blade 10a is operating in the forward direction, if the count number S1 is less than M2, the wiper blade 10b remains stopped, and the wiper blade 10a rotates corresponding to the count number S1. After turning by an angle, the wiper blade 10b is configured to start operating in the forward direction with a delay.

After performing Step S6, the process returns to Step S3 again. In step S3, once the wiper blades 10a and 10b start to move from the stop position (first inversion positions A1 and B1) and one of them is not in the stop position (step S3; NO), the process proceeds to step S7.
In step 7, it is determined whether or not the count number S1 is “N1” (that is, whether or not the wiper blade 10a is in the second inversion position A2). When the count number S1 is not “N1” (step S7; NO), since the wiper blade 10a has not reached the second reversal position A2, step S7 is repeated and the motor unit 20a is continuously rotated forward.

  On the other hand, when the count number S1 is “N1” (step S7; YES), since the wiper blade 10a has reached the second reversal position A2, a drive signal in the reverse rotation direction is sent to the motor unit 20a to wipe the wiper. The blade 10a is moved in the reverse direction (step S8). When the motor unit 20a rotates in the reverse direction, a rotation signal is sent from the rotation amount detection sensor 22a. Accordingly, the control unit 30 counts down the count number S1 and monitors the rotation amount. When the count number S1 becomes “N1”, the control unit 30 confirms that the wiper blade 10a is at the second inversion position A2 based on the detection signal from the inversion position detection switch 23a.

Next, it is determined whether or not the count number S2 is N2 (step S9). When the count number S2 is not N2 (step S9; NO), step S9 is repeated. On the other hand, when the count number S2 is N2 (step S9; YES), a drive signal in the reverse rotation direction is sent to the motor unit 20b to move the wiper blade 10b in the reverse direction (step S10). When the motor unit 20b rotates in the reverse direction, a rotation signal is sent from the rotation amount detection sensor 22b. Accordingly, the control unit 30 counts down the count number S2 and monitors the rotation amount. When the count number S2 becomes “N2”, the control unit 30 confirms that the wiper blade 10b is at the second inversion position B2 based on the detection signal from the inversion position detection switch 23b.
Thus, since the wiper blade 10a reaches the second reversal position A2 first and the wiper blade 10b reaches the second reversal position B2 with a delay, the generation of the reversal sound can be dispersed over time.

  In step S11, it is determined whether the operation flag FL is “0” or “1”. That is, in step S11, it is determined whether the operation switch 40 is in the stop position or the operation position. When the operation flag FL is “1” (step S11; FL = 1), the reciprocating wiping operation is continuously performed by the wiper blades 10a and 10b. Then, it is determined whether or not the count number S1 is “0” (that is, whether or not the wiper blade 10a is at the first inversion position A1). When the count number S1 is not “0” (step S12; NO), since the wiper blade 10a has not reached the first reversal position A1, step S12 is repeated and the motor unit 20a is continuously reversely rotated.

  On the other hand, when the count number S1 is “0” (step S12; YES), since the wiper blade 10a has reached the first reverse position A1, a drive signal in the forward rotation direction is sent to the motor unit 20a to wipe the wiper. The blade 10a is moved in the forward direction (step S13). When the motor unit 20a rotates forward, a rotation signal is sent from the rotation amount detection sensor 22a. Accordingly, the control unit 30 counts up the count number S1 and monitors the rotation amount. When the count number S1 becomes “0”, the control unit 30 confirms that the wiper blade 10a is at the first inversion position A1 based on the detection signal from the inversion position detection switch 23a.

  Next, it is determined whether or not the count number S2 is 0 (step S14). When the count number S2 is not 0 (step S14; NO), step S14 is repeated. On the other hand, when the count number S2 is 0 (step S14; YES), a drive signal in the forward rotation direction is sent to the motor unit 20b to move the wiper blade 10b in the forward direction (step S15). When the motor unit 20b rotates forward, a rotation signal is sent from the rotation amount detection sensor 22b. Accordingly, the control unit 30 counts up the count number S2 and monitors the rotation amount. When the count number S2 becomes “0”, the control unit 30 confirms that the wiper blade 10b is at the first inversion position B1 based on the detection signal from the inversion position detection switch 23b.

Thus, since the wiper blade 10a reaches the first inversion position A1 first and the wiper blade 10b reaches the first inversion position B1 with a delay, the generation of the inversion sound can be dispersed in time.
And it returns to step S7 again, the motor parts 20a and 20b are rotated forward and backward, and the reciprocating wiping operation of the window glass 1 is performed by the wiper blades 10a and 10b.

On the other hand, when the operation flag FL is “0” in step S11 (step S11; FL = 0), a process of stopping the reciprocating wiping operation by the wiper blades 10a and 10b is performed (steps S16 to S19).
In step S16, it is determined whether or not the count number S1 has become “0” (whether or not the wiper blade 10a has reached the first stop position A1). When the count number S1 is not “0” (step S16; NO), step S16 is repeated and the motor unit 20a is continuously rotated in the reverse direction. On the other hand, when the count number S1 is “0” (step S16; YES), since the wiper blade 10a has reached the first inversion position A1, transmission of the drive signal to the motor unit 20a is stopped, and the wiper blade 10a is stopped at the first inversion position A1 (step S17).

Next, it is determined whether or not the count number S2 is 0 (step S18). When the count number S2 is not 0 (step S18; NO), step S18 is repeated. On the other hand, when the count number S2 is 0 (step S18; YES), the transmission of the drive signal to the motor unit 20b is stopped, and the wiper blade 10b is stopped at the first inversion position B1 (step S19), and the step is again performed. Return to S2.
In the above embodiment, whether or not the wiper blade has reached the reversal position is determined by whether or not the count numbers S1 and S2 have reached the initial setting values “N1” and “N2”. However, the present invention is not limited to this, and it may be determined that the reverse position has been reached based on a detection signal from the reverse position detection switch.

  Further, the control unit 30 only counts up the count numbers S1 and S2 based on the rotation signal every half cycle, and resets the count numbers S1 and S2 when receiving the reverse position detection signal from the reverse position detection switch. It may be. In this case, the rotation angle between the first inversion position and the second inversion position can be monitored within the range of the count number S1 (S2) from “0” to “N1” (“N2”).

In the above embodiment, the wiper blades are configured to have different reversal timings at both the first reversal position and the second reversal position. However, the present invention is not limited to this, either the first reversal position or the second reversal position. On the other hand, you may comprise so that inversion time may differ.
FIG. 6 is a flowchart showing an example in which the inversion time is changed at either the first inversion position or the second inversion position. In this example, the control unit 30 controls the motor unit 20a and the motor unit 20b so that the motor unit 20a as a whole has a higher rotational speed than the motor unit 20b during the normal rotation by the drive voltage sent to the motor units 20a and 20b. During reverse rotation, the motor unit 20b as a whole is controlled to have a higher rotational speed than the motor unit 20a. That is, when wiping in the forward direction, the wiper blade 10a takes less time to reach the second inversion position from the first inversion position than the wiper blade 10b, and when wiping in the reverse direction, the wiper blade 10b Is shorter than the wiper blade 10a in reaching the first inversion position from the second inversion position. Even if the wiping range (angle) is different between the driver side and the passenger seat side, the wiping time required for the half cycle in the forward direction is shorter on the driver side and the wiping required for the half cycle in the reverse direction. The time on the passenger side is controlled shorter.

First, in steps S101 and S102, the initial setting and the switch position of the operation switch 40 are determined in the same manner as in the above embodiment. When the switch position is “ON” in step S102 (step S102; ON), the motor units 20a and 20b are normally rotated in step S103. In step S103, the motor units 20a and 20b start to rotate forward substantially simultaneously. Due to the forward rotation of the motor units 20a and 20b, the count numbers S1 and S2 are counted up according to the rotation amount.
Then, in step S104, it is determined whether or not the count number S1 is “N1”. When the count number S1 is not “N1” (step S104; NO), step S104 is repeated, and the count number S1 is “N1”. If (step S104; YES), the process proceeds to step S105, and the control unit 30 rotates the motor unit 20a in the reverse direction. With the reverse rotation of the motor unit 20a, the count number S1 is counted down.

Subsequently, for the motor unit 20b having a slow rotation speed in the forward rotation direction, it is determined in step S106 whether or not the count number S2 is “N2”. When the count number S2 is not “N2” (step S106; NO) ) Repeats step S106, and when the count number S2 is “N2” (step S106; YES), the process proceeds to step S107, and the control unit 30 rotates the motor unit 20b in the reverse direction. With the reverse rotation of the motor unit 20b, the count number S2 is counted down.
When both the motor units 20a and 20b rotate in the reverse rotation direction, it is determined in step S108 whether the operation flag FL is “0” or “1”. When the operation flag FL is “1” (step S108; FL = 1), the reciprocating wiping operation is continuously performed by the wiper blades 10a and 10b.

  When the operation flag FL is “1” in step S108, it is determined in step S109 whether or not the count numbers S1 and S2 are both “0”. If both are “0” (step S109; YES), step S109 is performed. Returning to S103, if both are not "0" (step S109; NO), the process proceeds to step S110. Note that the count numbers S1 and S2 are both “0” in step S109 when the wiper blades 10a and 10b are simultaneously returned to the first inversion position.

  In step S110, it is determined whether the count number S1 is “0” and the count number S2 is greater than “0”. When the count number S1 is “0” and the count number S2 is greater than “0” (step S110; YES), the wiper blade 10a has reached the first inversion position earlier than the wiper blade 10b. Thus, the control unit 30 stops the motor unit 20a. In step S112, it is determined whether or not the count number S2 is “0”. When the count number S2 is not “0” (step S112; NO), step S112 is repeated, and the count number S2 is “0”. If there is (step S112; YES), the process returns to step S103.

On the other hand, when the count number S1 is “0” and the count number S2 is not greater than “0” in step S110 (step S110; NO), the count number S1 is greater than “0” and the count number S2 is “0” in step S113. Whether or not “0” is determined.
When the count number S1 is larger than “0” and the count number S2 is “0” in step S113 (step S113; YES), the wiper blade 10b reaches the first inversion position earlier than the wiper blade 10a. Therefore, in step S114, the control unit 30 stops the motor unit 20b. In step S115, it is determined whether or not the count number S1 is “0”. When the count number S1 is not “0” (step S115; NO), step S115 is repeated, and the count number S1 is “0”. If there is (step S115; YES), the process returns to step S103.

  When the count number S1 is greater than “0” and the count number S2 is not “0” in step S113 (step S113; NO), in steps S109, S110, and S113, both the count numbers S1 and S2 are “ Since it is not “0” (that is, neither wiper blade 10a, 10b has returned to the first inversion position), step S109, S110, S113 is repeated until either one becomes “0”. Return to S109.

As described above, in step S109 to step S115, the wiper blade that has returned to the first reverse position first waits in a stopped state with the wiper blade that has returned late, and both wiper blades 10a and 10b are in the first reverse direction. When returning to the position, the operation is simultaneously started toward the second reversal position.
That is, in this example, at least at the second reversal position, the wiper blade 10a performs the reversing operation first, and the wiper blade 10b performs the reversing operation with a delay. Can be reduced.

When the operation flag FL is “0” in step S108 (step S108; FL = 0), the wiping operation is stopped. In step S116, whether the count numbers S1 and S2 are both “0” or not. When both are “0” (step S116; YES), the control unit 30 stops the motor units 20a and 20b in step S117 and returns to step 102 again.
When the count numbers S1 and S2 are not both “0” in step S116 (step S116; NO), it is determined in step S118 whether the count number S1 is “0” and the count number S2 is greater than “0”. .

  When the count number S1 is “0” and the count number S2 is larger than “0” in step S118 (step S118; YES), the motor unit 20a is stopped in step S119, and subsequently the count number S2 is “0” in step S120. Is determined. When the count number S2 is not “0” (step S120; NO), step S120 is repeated. When the count number S2 becomes “0” (step S120; YES), the motor unit 20b is stopped at step S121, and again. Return to step S102.

On the other hand, when the count number S1 is “0” and the count number S2 is not greater than “0” in step S118 (step S118; NO), the count number S1 is greater than “0” and the count number S2 is equal to “0” in step S122. It is determined whether or not it is “0”.
When the count number S1 is greater than “0” and the count number S2 is “0” in step S122 (step S122; YES), the motor unit 20b is stopped in step S123, and subsequently the count number S1 is “0” in step S124. Whether or not “0” is determined. When the count number S1 is not “0” (step S124; NO), step S124 is repeated. When the count number S1 becomes “0” (step S124; YES), the motor unit 20a is stopped at step S125, and again. Return to step S102.

  When the count number S1 is greater than “0” and the count number S2 is not “0” in step S122 (step S122; NO), the count numbers S1 and S2 are both “0” in steps S116, S118, and S122. Therefore, the process returns to step S116 in order to repeat steps S116, S118, and S122 until any one becomes “0”. Thus, from step S116 to step S125, the motor units 20a and 20b are stopped in the order in which the first reverse position is reached.

  In this example, the wiper blades 10a and 10b are configured to have different wiping times so that the reversal times do not overlap at least at the second reversal position. You may comprise so that a time may not overlap.

Moreover, in the said embodiment, although the vibration isolator 51a, 51b, 52a, 52b is provided in the window glass 1, you may comprise as shown in FIG.
In the example of FIG. 7A, the vibration isolator 53 is disposed on the base side of the wiper arm 11a of the motor unit 20a, and the anti-vibration material 53a is provided when the wiper arm 11a reaches the first reverse position A1 and the second reverse position A2. Stoppers 11b and 11c are disposed on the vehicle side so as to come into contact with the vibration member 53. As described above, by bringing the vibration isolator 53 and the stoppers 11b and 11c into contact with each other at the reversal position, it is possible to effectively attenuate noise such as reversal sound generated at the time of reversal, and to reduce the noise level. Is possible.

  Further, in the example of FIG. 7B, vibration-proof materials 54a and 54b are disposed on the vehicle side so as to come into contact with the Yi power ham 11a at the first inversion position A1 and the second inversion position A2. In this way, by bringing the wiper arm 11a into contact with the vibration isolating materials 54a and 54b disposed on the vehicle side at the reversal position, noise during reversal can be effectively attenuated, and the noise level is reduced. Is possible.

  In the above embodiment, the wiper arms 11a and 11b are directly connected to the output shafts 21a and 21b of the motor units 20a and 20b, and the wiper arms 11a and 11b are swung by the forward and reverse rotation of the motor units 20a and 20b. However, the present invention is not limited to this, and the drive unit may be configured to rotate only in one direction, and the wiper arm may be swung by connecting the wiper arm to the drive unit via a link to the output shaft. Also in this case, the wiper speed of the wiper arm and the wiper blade can be configured to be low at the reverse position by controlling the drive voltage supplied to the drive unit by the control unit.

Moreover, in the said embodiment, although the rotational speed of motor part 20a, 20b was electrically controlled with the drive signal from the control part 30, not only this but motor part 20a, 20b and wiper arm 11a, 11b, Between them, a rotation speed adjustment mechanism may be connected to mechanically adjust the rotation speed. In FIG. 8, the motor 20b on the passenger seat side will be described.
In this example, a pivot shaft 5 as a support shaft is rotatably provided on the vehicle body, and a wiper arm 11b is fixed to the pivot shaft 5 and a connection lever 6 is fixed. The wiper arm 11b is reciprocated by a four-bar linkage mechanism 60 as a rotation speed adjustment mechanism.

  A rotation shaft 62 and a rotation shaft 63 are provided on the main body 61 constituting the fixed node of the four-bar linkage mechanism 60 with a predetermined interval. A rotating lever 64 is fixed to the rotating shaft 62, and a rotating lever 65 longer than the rotating lever 64 is fixed to the rotating shaft 63. The distal ends of the rotating lever 64 and the rotating lever 65 are connected to each other by a connecting plate 67 that is formed in a substantially triangular shape via a connecting pin 66 serving as a moving node and constitutes a swing link.

An output shaft 21b of a motor unit 20b that rotates at a constant speed is connected to the rotating shaft 62, and the rotating lever 64 is rotated clockwise through the rotating shaft 62. The connection plate 67 is swung by the rotation of the rotation lever 64, and the tip of the rotation lever 65 is rotated about the rotation shaft 63. The rotation lever 64, the rotation lever 65, and the connecting plate 67 constitute a crank mechanism.
One end of a connection link 69 is swingably connected to the connection plate 67 via a connection pin 68. The other end of the connection link 69 is connected to the tip of the connection lever 6 via a connection pin 70.

  When the output shaft 21b of the motor unit 20b rotates clockwise, the rotating lever 64 rotates and the connecting plate 67 swings. For this reason, the rotation lever 65 rotates about the rotation shaft 63 as a fulcrum. At this time, the locus of the connecting pin 68 provided on the connecting plate 67 is elliptical. When the connecting pin 68 reaches the long axis portion of the elliptical locus, the wiper blade 10a reaches the first reverse position B1 or the second reverse position B2, and when the connecting pin 68 reaches the short axis portion of the elliptical locus, the wiper The blade 10b is assembled in advance so as to reach an intermediate position between the first inversion position B1 and the second inversion position B2.

Therefore, when the output shaft 21 b rotates, the four-bar linkage mechanism 60 rotates the connection lever 6 via the connection link 69. Since the rotation angle of the connecting pin 68 is small with respect to the constant speed rotation of the output shaft 21b when the connecting pin 68 has reached the long axis portion of the elliptical locus, that is, when the wiper blade 10b has reached the reverse position. The rotation speed for rotating the connection lever 6 is reduced.
Further, when the connecting pin 68 reaches the short axis portion of the elliptical locus, that is, when the wiper blade 10b reaches the intermediate position, the rotation angle of the connecting pin 68 is larger than the constant speed rotation of the output shaft 21b. Therefore, the rotation speed for rotating the connection lever 6 is increased.

As a result, the rotation speed of the connecting lever 6, that is, the rotation speed of the wiper blade 10b is low at the reverse position and high at the intermediate position.
As described above, in this example, the motor unit 20b and the wiper arm 11b are connected by the link, and the four-bar linkage mechanism 60 as the rotation speed adjusting mechanism is connected therebetween, so that the motor unit 20b is unidirectional at a constant speed. Even when the wiper blade 10b rotates, the wiper blade 10b can reduce the wiping speed in the vicinity of the reversal position as compared with the intermediate position, so that the level of the reversal sound during reversal can be lowered.

  In the above modification, the four-bar linkage mechanism 60 has been described as the rotation speed adjustment mechanism. However, the rotation speed adjustment mechanism as a mechanical configuration is not limited to this, and other known mechanisms may be used. Good. For example, various configurations described in Japanese Patent Laid-Open No. 5-238356 (a planetary gear mechanism, a cam mechanism, a universal joint mechanism, etc. may be used as the rotation speed adjusting mechanism).

It is explanatory drawing of the wiper apparatus which concerns on one Embodiment of this invention. It is explanatory drawing of the vibration isolator of the wiper apparatus which concerns on one Embodiment of this invention. It is explanatory drawing of operation | movement of the wiper apparatus which concerns on one Embodiment of this invention. It is explanatory drawing of the wiping speed of the wiper apparatus which concerns on one Embodiment of this invention. It is a flowchart of the operation | movement procedure of the wiper apparatus which concerns on one Embodiment of this invention. It is a flowchart of the operation | movement procedure of the wiper apparatus which concerns on other embodiment of this invention. It is explanatory drawing of the vibration isolator of the wiper apparatus which concerns on other embodiment of this invention. It is explanatory drawing of the wiper apparatus which concerns on other embodiment of this invention.

Explanation of symbols

1. Window glass, 2a, 2b, wiping area, 5. Pivot shaft, 6. Connection lever, 10a, 10b, wiper blade, 11b, 11c, stopper, 11a, 11b, wiper arm, 20a, 20b..Motor part (drive part), 21a, 21b..Output shaft, 22a, 22b..Rotation amount detection sensor, 23a, 23b..Reverse position detection switch, 30..Control part, 40..Operation switch, 51a, 51b, 52a, 52b ... Vibration isolator 60 ... Four-bar linkage mechanism (rotational speed adjustment mechanism) 61 ... Main body 62 ... Rotary shaft 63 ... Rotary shaft 64 ... Rotary lever , 65 .. Rotating lever, 66, 68, 70 .. Connecting pin, 67 .. Connecting plate, 69 .. Connection link, A1, A2, B1, B2 .. Reverse position, S. Wiper device

Claims (6)

A wiper device comprising a plurality of wiper blades that perform a reciprocating wiping operation between a first inversion position and a second inversion position,
The wiper device is characterized in that the plurality of wiper blades are driven so that the respective reversal times are different at least at the first reversal position or the second reversal position. A wiper device comprising a plurality of wiper blades that perform a reciprocating wiping operation between a first inversion position and a second inversion position,
A drive unit that drives the wiper blade via a wiper arm that supports each wiper blade;
And a control unit that controls the drive unit so that the reversal timing of the wiper blade is different at least at the first reversal position or the second reversal position.   3. The wiper device according to claim 2, wherein the control unit controls the driving unit to reduce the wiping speed of each wiper blade at least in the vicinity of the first inversion position or the second inversion position. . The wiper arm is connected to a connection lever that reciprocates the wiper arm around a support shaft;
The connection lever is configured to reduce the wiping speed of the wiper blade when the wiper blade reaches at least the first reverse position or the vicinity of the second reverse position when the wiper arm is reciprocating. The wiper device according to claim 2, wherein the wiper device is connected to the drive unit via a rotation speed adjustment mechanism that changes a rotation speed.   3. The control unit according to claim 2, wherein the control unit controls the drive unit so that a driver-side wiper blade among the plurality of wiper blades is quickly operated from a state in which the drive unit is stopped. Wiper device. Anti-vibration means is disposed in a portion of the window glass corresponding to at least the first reversal position or the second reversal position, the wiper arm, or at least a portion that contacts the wiper arm in the first reversal position or the second reversal position. The wiper device according to claim 2.

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