WO2020012770A1

WO2020012770A1 - Vehicle wiper device and method for controlling vehicle wiper device

Info

Publication number: WO2020012770A1
Application number: PCT/JP2019/018494
Authority: WO
Inventors: 知秀牧原; 寛田之上
Original assignee: 株式会社デンソー
Priority date: 2018-07-11
Filing date: 2019-05-09
Publication date: 2020-01-16

Abstract

This vehicle wiper device comprises a drive motor (11a) and a control circuit (13) that controls the rotational speed of the drive motor. This vehicle wiper device is configured so as to cause wipers (W1, W2) to swing reciprocatingly on the basis of rotary driving of the drive motor and perform a wiping motion on the outer surface of the windshield (FW) of the vehicle, and also so as to be capable of changing the speed of the wiping motion of the wipers between a first speed mode and a second speed mode, which is faster than the first speed mode, by controlling the rotational speed of the drive motor. A control circuit controls the rotational speed of the drive motor so that in the two end regions (A1, A2) including wiper swing reversal positions (P1, P2) and an intermediate region (A3) between the two end regions, the speed difference (Va1, Va2) in the rotational speed (VLx, VHx) of the drive motor between the first speed mode and the second speed mode in at least one of the end regions is smaller than the speed difference (Va3) in the intermediate region.

Description

Vehicle wiper device and control method for vehicle wiper device

The present invention relates to a vehicle wiper device for reciprocatingly oscillating a wiper and a method for controlling the vehicle wiper device.

As a vehicle wiper device, the pivot shaft is reciprocally rotated via a link mechanism based on driving of an output shaft of a wiper motor, and a wiper arm attached to the pivot shaft is reciprocally rotated, thereby being connected to a distal end portion of the wiper arm. There is known a configuration in which a wiper blade is used to wipe foreign matter such as raindrops attached to an outer surface of a front windshield of a vehicle.

車両 Generally, the wiper device for a vehicle can change the wiping operation of the wiper to a low speed or a high speed according to the driver's preference based on the rainfall. When a brush motor is used as the wiper motor, a low-speed driving brush, a high-speed driving brush, and a common brush are used as the motor power supply brush. And the high-speed rotation drive of the motor by the power supply via the power supply is switched, so that the wiping speed of the wiper can be changed (for example, see Patent Document 1).

Japanese Patent No. 4981420

By the way, not only the mode of changing the wiper speed using the low-speed drive brush and the high-speed drive brush, but also the mode of controlling the rotation speed of the wiper motor by the control circuit, the wiper speed of the wiper is high. In the case of the wiper device that can be changed to the low-speed drive and the low-speed drive, if no countermeasure is taken, the overrun amount of the wiper at each reversal position of the reciprocating swing becomes larger in the high-speed operation than in the low-speed operation. This leads to a problem in setting each reversal position (wiping area) of the wiper.

That is, when the low-speed operation with a small overrun amount is used as a reference, in the other high-speed operation with a large overrun amount, the wiper contacts a portion (for example, a pillar) around the front windshield at each reversal position. There is a fear. Conversely, when the high-speed operation with a large overrun amount is used as a reference, at the time of the other low-speed operation with a small overrun amount, the inversion positions of the wipers are on the near side, and the wiping area is narrowed. Then, since the lower reversing position, which is the reversing position on one side of the wiper, is also a stop position, if the wiper stops before the desired position, the wiper hinders the view from the driver side, It is a concern that the running wind is likely to hit the wind and the wind noise increases.

An object of the present invention is to make it possible to keep the displacement at the swing reversal position small even if the wiping speed of the wiper is changed between high-speed driving and low-speed driving, and to secure a wide and stable wiping area of the wiper. An object of the present invention is to provide a vehicle wiper device and a control method of the vehicle wiper device.

To achieve the above object, a vehicle wiper device according to an aspect of the present disclosure includes a drive motor (11a) and a control circuit (13) that controls a rotation speed of the drive motor. The wiper device for a vehicle performs a wiping operation on an outer surface of a windshield (FW) of a vehicle by reciprocatingly oscillating a wiper (W1, W2) based on the rotational drive of the drive motor, and By controlling the rotation speed of the wiper, the operation speed of the wiping operation of the wiper can be changed between a first speed mode and a second speed mode having an operation speed higher than the first speed mode. The control circuit includes at least one of the end regions in both end regions (A1, A2) including the wiper swing reversal positions (P1, P2) and an intermediate region (A3) between the both end regions. The speed difference (Va1, Va2) between the rotation speeds (VLx, VHx) of the drive motor between the first speed mode and the second speed mode is smaller than the speed difference (Va3) in the intermediate region. Performs motor speed control.

A control method of a vehicle wiper device according to a further aspect of the present invention includes reciprocating swinging of a wiper based on rotation of a drive motor to perform a wiping operation on an outer surface of a windshield of the vehicle. The control method further includes changing an operation speed of the wiping operation of the wiper to a first speed mode and a second speed mode having an operation speed higher than the first speed mode by controlling a rotation speed of the drive motor. . In an end region including the wiper swing reversal position and an intermediate region between both end regions, the drive motor of the first speed mode and the second speed mode on at least one side of the end region is provided. The rotational speed of the drive motor is controlled so that the rotational speed difference is smaller than the rotational speed difference in the intermediate region.

According to each of the above aspects, in the end region including the wiper swing reversal position and the intermediate region therebetween, the speed difference of the rotation speed of the motor portion 11a of the wiper on at least one side of the end region (first speed mode) Difference between the rotation speed of the motor section 11a of the wiper and the second speed mode) is made smaller than the speed difference in the intermediate region. In other words, since the speed difference between the first speed mode and the second speed mode is large in the intermediate region of the wiper, the wiping operation having a roll is provided for each speed mode of the wiper, and the motor is rotated at the reverse position. Since the difference in the rotational speed of the portion 11a is suppressed to a small value, the difference in the overrun amount of the wiper (position shift at the reversal position) is suppressed to a small value, and a wide and stable wiping area of the wiper can be secured. .

The block diagram of the wiper device for vehicles in one Embodiment. FIG. 2 is a partial configuration diagram of a drive circuit of a wiper motor according to one embodiment. FIG. 4 is a waveform diagram showing a manner of changing the rotation speed of the wiper motor according to one embodiment. FIG. 9 is a partial configuration diagram of a drive circuit of a wiper motor in another example. FIG. 9 is a waveform diagram showing a manner of changing the rotation speed of a wiper motor in another example. FIG. 9 is a waveform diagram showing a manner of changing the rotation speed of a wiper motor in another example. FIG. 9 is a waveform diagram showing a manner of changing the rotation speed of a wiper motor in another example. FIG. 9 is a waveform diagram showing a manner of changing the rotation speed of a wiper motor in another example.

Hereinafter, an embodiment of a vehicle wiper device and a control method of the vehicle wiper device will be described.
As shown in FIG. 1, a vehicle wiper device 10 of the present embodiment reciprocates a pair of wipers W1 and W2 disposed on an outer surface of a front windshield FW of a vehicle, and raindrops on the outer surface. Is wiped by the wipers W1 and W2.

The vehicle wiper device 10 includes a wiper motor 11 as a drive source, and a link mechanism 12 that converts the driving of the output shaft 11x of the wiper motor 11 into a reciprocating swing operation of the pair of wipers W1 and W2. The wipers W1 and W2 are for wiping the wiping area X1 on the driver's seat side and the wiping area X2 on the passenger seat side, respectively, and include a wiper arm Wa and a wiper blade Wb. The wiper arms Wa of the wipers W1 and W2 have their base ends attached to a pair of pivot shafts 12x, which are output shafts of the link mechanism 12, respectively, and reciprocate with the pivot shafts 12x. The wiper blade Wb of each of the wipers W1 and W2 is connected to the tip end of each of the wiper arms Wa, and swings while sliding on the outer surface of the front windshield FW by reciprocating rotation of each of the wiper arms Wa, so that the wiper blades Wb on the outer surface are rotated. Perform wiping.

The wiper motor 11 includes a motor unit 11a as a drive motor composed of a brushed motor, and a reduction unit 11b that reduces the rotation generated by driving the motor unit 11a to a high torque and transmits the rotation to the output shaft 11x. As a motor with a speed reduction mechanism. Further, the wiper motor 11 includes a control circuit 13 for controlling the rotation of the motor unit 11a in the speed reduction unit 11b. In the control mode of the present embodiment, the control circuit 13 performs one-way rotation driving of the motor unit 11a to reciprocally swing the wipers W1 and W2, and also controls the rotation speed of the motor unit 11a.

The control circuit 13 includes a drive circuit 14 using two semiconductor switches Tr1 and Tr2, as shown in FIG. As the semiconductor switches Tr1 and Tr2, for example, field effect transistors (Field effect transistors, FETs) are used. The drain of the semiconductor switch Tr1 is connected to an in-vehicle battery (not shown) (supply of DC power supply VB), and the source is connected to one terminal (one power supply brush) of the motor unit 11a and the drain of the semiconductor switch Tr2. The drain of the semiconductor switch Tr2 is connected to one terminal (one power supply brush) of the motor unit 11a and the source of the semiconductor switch Tr1, and the source is grounded to the ground GND. The other terminal (the other power supply brush) of the motor unit 11a is grounded to the ground GND. The gates of the semiconductor switches Tr1 and Tr2 are connected to a pre-driver (not shown). The control circuit 13 turns on and off the semiconductor switches Tr1 and Tr2 of the drive circuit 14 through the pre-driver.

{Circle around (1)} When performing one-way rotation driving of the motor unit 11a to reciprocally swing the wipers W1 and W2, the semiconductor switch Tr1 of the drive circuit 14 is in an ON period, and the semiconductor switch Tr2 is in an OFF period. The current flow to the motor unit 11a is in the direction indicated by the arrow α in FIG. When the wipers W1 and W2 are stopped, braking control is also performed on the motor unit 11a. In this case, the semiconductor switch Tr2 is turned on and the semiconductor switch Tr1 is turned off, and a closed loop including the motor unit 11a is formed in the drive circuit 14. The current flow during braking of the motor unit 11a is in the direction of the arrow β in FIG.

In the vehicle wiper device 10 of the present embodiment, the wiping operation by the reciprocating swing of the wipers W1 and W2 is based on at least a low-speed operation mode (first speed) based on operation of a wiper switch (not shown) or automatic switching by rainfall detection. Mode) and a high-speed operation mode (second speed mode). In the control circuit 13 (drive circuit 14), switching control (PWM control) by pulse width modulation (Pulse Width Modulation, PWM) is performed on the semiconductor switch Tr1 which is in the ON period when the motor unit 11a is rotationally driven. That is, the control duty of the semiconductor switch Tr1 is changed to adjust the current to the motor unit 11a, that is, to control the rotation speed of the motor unit 11a, and the wipers W1 and W2 operate in the operation mode including at least the low-speed operation mode and the high-speed operation mode. A wiping operation is performed.

In each of the low-speed operation mode and the high-speed operation mode of the wipers W1 and W2 of the present embodiment, the change in the rotation speed of the motor unit 11a in one reciprocating swing of the wipers W1 and W2 is the operation shown in FIG. At the time of high-speed operation, the control duty is changed so as to become the operation speed VHx shown in FIG. 3 so as to become the speed VLx. FIG. 3 shows the rotation speed of the motor unit 11a at the time of continuous operation, and does not show the rotation speed of the motor unit 11a at the start and stop of driving.

The rotation speed VLx of the motor unit 11a at the time of the low-speed operation of the wipers W1 and W2 is changed in a sine wave shape around the average speed VLa at the time of the low-speed operation. The setting changes one cycle at a time.

The rotation speed VLx of the motor unit 11a at the time of the low-speed operation is the fastest at the lower inversion position (stop position) P1 when the wipers W1 and W2 move forward, and gradually decreases as the forward movement advances from the lower inversion position P1. , And becomes the slowest at an intermediate position P3 between the lower inversion position P1 and the upper inversion position P2. As the wipers W1 and W2 move forward from the intermediate position P3, the rotation speed VLx of the motor unit 11a at the time of low-speed operation changes so as to gradually increase, and becomes the highest speed again at the upper inversion position P2. Is set. Similarly, when the wipers W1 and W2 move backward, the rotation speed VLx of the motor unit 11a at the time of low-speed operation becomes the fastest at the upper reversal position P2 of the wipers W1 and W2, and moves backward from the upper reversal position P2. Then, it gradually changes to be slower, and becomes slowest at the intermediate position P3. As the wipers W1 and W2 move backward from the intermediate position P3, the rotation speed VLx of the motor unit 11a at the time of low-speed operation changes so as to gradually increase, and again becomes the highest speed at the lower inversion position (stop position) P1. It is set to be. The rotation speed VLx of the motor unit 11a at the time of the low speed operation is slower than the average speed VHa at the time of the high speed operation even if it is the fastest at the lower inversion position (stop position) P1 and the upper inversion position P2. The rotation speed VHx of the motor unit 11a is set to be slightly lower than the slowest speed.

The rotation speed VHx of the motor unit 11a at the time of high-speed operation of the wipers W1 and W2 is changed in a sine wave shape around the average speed VHa at the time of high-speed operation. The setting changes one cycle at a time. The amplitude (the difference between the maximum speed and the minimum speed) of the rotation speed VHx of the motor unit 11a during the high-speed operation is the amplitude of the change (the difference between the maximum speed and the minimum speed) of the rotation speed VLx of the motor unit 11a during the low-speed operation. Difference). Further, the sinusoidal change in the rotation speed VHx of the motor unit 11a during the high-speed operation has an opposite phase to the sinusoidal change in the rotation speed VLx of the motor unit 11a during the low-speed operation.

The rotation speed VHx of the motor section 11a at the time of high-speed operation is the slowest at the lower reversal position (stop position) P1 when the wipers W1 and W2 move forward, and gradually increases as the forward movement advances from the lower reversal position P1. And becomes the fastest at the intermediate position P3. As the wipers W1 and W2 move forward from the intermediate position P3, the rotation speed VHx of the motor unit 11a at the time of high-speed operation changes so as to gradually decrease, and becomes the slowest speed again at the upper inversion position P2. Is set. Similarly, when the wipers W1 and W2 move backward, the rotation speed VHx of the motor unit 11a at the time of high-speed operation becomes the slowest at the upper inversion position P2 of the wipers W1 and W2, and the rotation proceeds from the upper inversion position P2. Then, the speed changes so as to gradually increase, and becomes the highest at the intermediate position P3. As the wipers W1 and W2 move backward from the intermediate position P3, the rotation speed VHx of the motor unit 11a at the time of high-speed operation changes so as to gradually decrease, and is again slowest at the lower inversion position (stop position) P1. It is set to be. The rotation speed VHx of the motor unit 11a at the time of the high-speed operation is faster than the average speed VLa at the time of the low-speed operation even if it is the slowest at the lower inversion position (stop position) P1 and the upper inversion position P2. Is slightly higher than the highest rotation speed VLx of the motor unit 11a.

Since the rotation speeds VLx and VHx of the motor unit 11a at the time of the low-speed operation and the high-speed operation change in a sine wave shape in opposite phases during one reciprocating swing, the lower inversion positions (stop positions) of the wipers W1 and W2. The rotation speeds VLx and VHx of the motor units 11a are close to each other near P1 and the upper reversing position P2, and the rotation speeds VLx and VHx of the motor units 11a are close to each other near the intermediate position P3.

That is, in the lower inversion side end area A1 set to a predetermined range including the lower inversion position (stop position) P1 of the wipers W1 and W2, and the upper inversion side end area A2 set to a predetermined range including the upper inversion position P2. Is such that the rotational speeds VLx and VHx of the motor section 11a at the time of low-speed operation and high-speed operation are sufficiently close to each other, and the speed difference Va1 between the end regions A1 and A2 at the time of low-speed operation and high-speed operation. Va2 is set to be sufficiently smaller than the speed difference Va3 in the intermediate region A3, and in this case, the setting is set to be sufficiently smaller than the speed difference Vaa between the average speeds VLa and VHa. Incidentally, in the present embodiment, the low-speed operation at the lower inversion position P1 and the upper inversion position P2 is such that the average speed VLa and VHa during the low-speed operation and the high-speed operation are in the middle area B which is equally divided into three. The rotation speeds VLx and VHx of the motor unit 11a at the time of and during high-speed operation are set. In one example, at each of the lower inversion position P1 and the upper inversion position P2, the speed difference of the rotation speed of the motor unit 11a between the low-speed operation mode and the high-speed operation mode becomes the smallest, and the difference becomes equal (speed difference Va1 = speed difference). Va2). On the other hand, in the intermediate area A3 centered on the intermediate position P3 between the both end areas A1 and A2, the rotation speeds VLx and VHx of the motor unit 11a during the low-speed operation and the high-speed operation are largely separated from each other, so that the intermediate area A3 The speed difference Va3 between the low-speed operation and the high-speed operation is sufficiently larger than the speed differences Va1 and Va2 in the end regions A1 and A2. In this case, the speed difference Va3 is sufficiently larger than the speed difference Vaa between the average speeds VLa and VHa. It is set to increase.

In other words, the speed difference (Va3) between the low-speed operation and the high-speed operation of the wipers W1 and W2 in each of the intermediate areas A3 of the reciprocating swing is clarified, and the wiper W1 and W2 are switched between the low-speed operation and the high-speed operation. Is performed. On the other hand, since the speed difference (Va1, Va2) between both end areas A1, A2 of the wipers W1, W2 is sufficiently small, the wiping operation of the wipers W1, W2 can be performed in the low-speed operation mode or the high-speed operation mode. Irrespective of this, the difference between the overrun amounts of the wipers W1 and W2 at the lower reversing position (stop position) P1 and the upper reversing position P2 is kept small.

Here, as a comparative example, a general mode in which the wiping operation of the wiper can be changed between the low-speed operation mode and the high-speed operation mode, including one using a wiper motor having a low-speed driving brush and a high-speed driving brush, is a low-speed operation mode. In both the operation mode and the high-speed operation mode, the rotation speed of the motor unit 11a is set to a constant speed. Therefore, the overrun amount of the wiper at each reversal position of the reciprocating swing of the wiper is larger in the high-speed operation than in the low-speed operation. The difference in the overrun amount of the wiper due to the speed change, that is, the displacement of the reversal position of the wiper leads to narrowing the wiping area of the wiper and the like.

On the other hand, in the present embodiment, even if the wipers W1 and W2 are changed from the low-speed operation mode to the high-speed operation mode, the displacement of each of the reversal positions P1 and P2 of the swing can be suppressed to be small. The regions X1 and X2 can be widely and stably secured. This reduces concerns such as the wipers W1 and W2 obstructing the driver's view, and the running wind is likely to hit the wipers W1 and W2 and the wind noise increases. Connect.

The effect of the present embodiment will be described.
(1) Low-speed operation of the wipers W1, W2 in the end regions A1, A2 in the end regions A1, A2 including the reversal positions P1, P2 of the swing operation of the wipers W1, W2 and the intermediate region A3 therebetween. The speed differences Va1 and Va2 between the rotation speeds VLx and VHx of the motor unit 11a at the time of high speed operation and at the time of high speed operation are set smaller than the speed difference Va3 in the intermediate region A3. In other words, the rotational speeds VLx and VHx of the motor unit 11a during the high-speed operation and the low-speed operation of the wipers W1 and W2 have large speed differences Va3 in the intermediate region A3. The wiping operation with the edge can be performed. On the other hand, at each of the reversing positions P1 and P2, the speed difference between the rotation speeds VLx and VHx of the motor unit 11a between the low-speed operation mode and the high-speed operation mode is suppressed, so that the difference between the overrun amounts of the wipers W1 and W2 (the reversing positions P1 and P2). (Position shift at P2) is kept small, and the wiping areas X1 and X2 of the wipers W1 and W2 can be widely and stably secured. This can be expected to have effects such as enlarging the field of view of the driver near the wipers W1 and W2 and reducing wind noise generated by the wipers W1 and W2.

(2) The speed differences Va1 and Va2 of the rotational speeds VLx and VHx of the motor unit 11a in both the end regions A1 and A2 are set to be smaller than the speed difference Va3 and the speed difference Vaa of the average speeds VHa and VLa in the intermediate region A3. Therefore, the difference (positional deviation) between the overrun amounts of the wipers W1 and W2 at both reversal positions P1 and P2 can be suppressed.

(3) Since the rotation speeds VLx and VHx of the motor unit 11a are changed in a sinusoidal manner, the wiping operation of the wipers W1 and W2 with the speed change can be performed smoothly.
(4) Since each of the rotation speeds VLx and VHx of the motor unit 11a is set to two stages of the low-speed operation mode and the high-speed operation mode, the control performed by the control circuit 13 can be prevented from becoming complicated.

(5) At the reversal positions P1 and P2 of the oscillating operations of the wipers W1 and W2 in the end regions A1 and A2, the rotation speed VLx of the motor unit 11a when the wipers W1 and W2 operate at low speed and the motor during high-speed operation. Each of the rotation speeds VHx of the unit 11a is set between the average speed VLa during the low-speed operation and the average speed VHa during the high-speed operation. Further, in the present embodiment, the rotation speeds VLx and VHx at the respective reversal positions P1 and P2 are each in the middle area B obtained by dividing the average speeds VLa and VHa during the low-speed operation and the high-speed operation into three equal parts. Is set to Accordingly, the rotational speeds VLx and VHx of the motor unit 11a at the time of the low-speed operation and the high-speed operation do not involve a rapid change in speed, so that the wiping operation of the wipers W1 and W2 can be stabilized. In particular, since each of the rotation speeds VLx and VHx at each of the reversing positions P1 and P2 is set in the region B, it is possible to prevent a rapid change in speed during both low-speed operation and high-speed operation. Therefore, the wiping operation of the wipers W1 and W2 can be more reliably stabilized.

(6) Since the sinusoidal change in the rotation speed VHx of the motor unit 11a during the high-speed operation of the wipers W1 and W2 and the sinusoidal change in the rotation speed VLx of the motor unit 11a during the low-speed operation are in opposite phases. In the end regions A1 and A2, the rotation speed VHx of the motor unit 11a during high-speed operation and the rotation speed VLx of the motor unit 11a during low-speed operation change so as to approach each other. Therefore, in the end regions A1 and A2, the speed difference between the rotation speed VHx of the motor unit 11a at the time of high-speed operation and the rotation speed VLx of the motor unit 11a at the time of low-speed operation is small, and the wiping operation of the wipers W1 and W2 is stable. Can be achieved.

This embodiment can be implemented with the following modifications. The present embodiment and the following modifications can be implemented in combination with each other within a technically consistent range.
The drive circuit 14 that performs one-way rotation and braking on the motor unit 11a is configured using the two semiconductor switches Tr1 and Tr2, but the circuit configuration is not limited to this. For example, a drive circuit 15 as shown in FIG. 4 may be used.

4 The drive circuit 15 shown in FIG. 4 is constituted by a so-called H-bridge circuit using four semiconductor switches Tr1 to Tr4. Specifically, the drive circuit 15 includes a semiconductor switch Tr1 having a drain connected to the vehicle-mounted battery (supply of the DC power supply VB) and a source connected to one terminal of the motor unit 11a and the drain of the semiconductor switch Tr2, and a drain connected to the semiconductor switch Tr2. A semiconductor switch Tr2 connected to the source of Tr1 and one terminal of the motor unit 11a and having a source grounded to the ground GND, and a drain connected to a vehicle-mounted battery (supply of DC power VB) and a source connected to the other terminal of the motor unit 11a A semiconductor switch Tr3 connected to the drain of the semiconductor switch Tr4, and a semiconductor switch Tr4 having a drain connected to the source of the semiconductor switch Tr3 and the other terminal of the motor unit 11a and a source grounded to the ground GND. You. The gates of the semiconductor switches Tr1 to Tr4 are connected to a pre-driver (not shown).

(4) During the normal wiping operation of the wipers W1 and W2, the semiconductor switches Tr1 and Tr4 are turned on to cause the motor unit 11a to perform one-way rotation driving, and a current in the α1 arrow direction flows through the motor unit 11a. Further, in this case, if one side of the semiconductor switches Tr1 and Tr4 is subjected to PWM control, the rotation speed of the motor unit 11a can be adjusted. At the time of braking of the motor unit 11a, the semiconductor switches Tr2 and Tr4 (or Tr1 and Tr3) are turned on to form a closed loop (current in the direction of the β arrow). The semiconductor switch Tr3 is used when the motor unit 11a is to be reversed in an emergency such as when the wiping operation of the wipers W1 and W2 continued by one-way driving of the motor unit 11a cannot be performed due to, for example, a snow puddle, and the semiconductor switches Tr3 and Tr2 are used. By turning on the set and passing a current in the direction of the arrow α2 to the motor section 11a, the motor section 11a can be driven in reverse rotation. In addition, since the semiconductor switch Tr3 is used only in an emergency and is rarely used, a low-priced and inexpensive semiconductor switch can be used separately from the other semiconductor switches Tr1, Tr2 and Tr4.

The manner of changing the rotation speed of the motor unit 11a is not limited to the embodiment shown in FIG. 3 and may be changed as appropriate. For example, the embodiments shown in FIGS. 5 to 8 may be used. 5 to 8 show the rotation speed of the motor unit 11a during the continuous operation, and do not show the rotation speed of the motor unit 11a at the time of starting and stopping the driving.

In the embodiment shown in FIG. 5, the amplitude of the sinusoidal change in the rotation speed VHx of the motor unit 11a during the high-speed operation is made larger than that shown in FIG. 3, and the sinusoidal change in the rotation speed VLx of the motor unit 11a during the low-speed operation is performed. Are in phase. The amplitude of the sinusoidal change in the rotation speed VHx of the motor unit 11a during the high-speed operation is set to be larger than the amplitude of the sinusoidal change in the rotation speed VLx of the motor unit 11a during the low-speed operation. At the lower reversing position (stop position) P1 and the upper reversing position P2, the rotation speed VLx of the motor unit 11a at the time of low speed operation and the rotation speed VHx of the motor unit 11a at the time of high speed operation are both higher than the average speed VLa at the time of low speed operation. Is also a slow setting. Even in such a speed change mode, in both end regions A1 and A2, the speed differences Va1 and Va2 between the low speed operation and the high speed operation are sufficiently smaller than the speed difference Vaa between the average speeds VHa and VLa, and the middle region Since the speed difference Va3 at A3 becomes sufficiently large, the wipers W1 and W2 can perform a wiping operation with a flip between the low-speed operation mode and the high-speed operation mode, and can operate in the low-speed operation mode or the high-speed operation mode. Regardless of the operation mode, the difference between the overrun amounts of the wipers W1 and W2 at the reversal positions P1 and P2 can be suppressed to a small value.

In the embodiment shown in FIG. 6, the sinusoidal change of the rotation speed VHx of the motor unit 11a during the high-speed operation is set to be higher than the average speed VLa during the low-speed operation, and the rotation speed VLx of the motor unit 11a during the low-speed operation is set to the average speed. The setting is constant at VLa. Similarly, in such a speed change mode, in both end regions A1 and A2, the speed differences Va1 and Va2 between the low-speed operation and the high-speed operation are sufficiently smaller than the speed difference Vaa between the average speeds VHa and VLa. Since the mutual speed difference Va3 in the intermediate region A3 becomes sufficiently large, the same effect as described above can be expected.

In the mode shown in FIG. 7, contrary to the mode shown in FIG. 6, the sinusoidal change of the rotation speed VLx of the motor unit 11a at the time of the low-speed operation is set lower than the average speed VHa at the time of the high-speed operation. The rotation speed VHx of the motor unit 11a is set to be constant at the average speed VHa. Similarly, in such a speed change mode, in both end regions A1 and A2, the speed differences Va1 and Va2 between the low-speed operation and the high-speed operation are sufficiently smaller than the speed difference Vaa between the average speeds VHa and VLa. Since the mutual speed difference Va3 in the intermediate region A3 becomes sufficiently large, the same effect as described above can be expected.

In the embodiment shown in FIG. 8, the rotation speed VHx of the motor unit 11a at the time of high-speed operation is set to a sinusoidal change, and the sinusoidal change of the rotation speed VLx of the motor unit 11a at the time of low-speed operation is in phase. And The setting is such that the amplitude of the sinusoidal change of the rotation speed VHx of the motor unit 11a during the high-speed operation is smaller than the amplitude of the sinusoidal change of the rotation speed VLx of the motor unit 11a during the low-speed operation. Similarly, in such a speed change mode, in both end regions A1 and A2, the speed differences Va1 and Va2 between the low-speed operation and the high-speed operation are sufficiently smaller than the speed difference Vaa between the average speeds VHa and VLa. Since the mutual speed difference Va3 in the intermediate region A3 becomes sufficiently large, the same effect as described above can be expected.

The rotation speeds VLx and VHx of the motor unit 11a during the high-speed operation and the low-speed operation are brought close to each other in the end regions A1 and A2 on both sides of the swing operation of the wipers W1 and W2. The rotation speeds VLx and VHx may be made close to each other only in the end region A2. At least at the reversal position P1 or the reversal position P2 on the side where the rotation speeds VLx and VHx are close to each other, it is possible to reduce the difference (positional displacement) between the overrun amounts of the wipers W1 and W2.

In the above-described embodiment, the difference between the rotation speed of the motor unit 11a in the low-speed operation mode and the high-speed operation mode in each of the lower inversion position P1 and the upper inversion position P2 is the smallest, and the difference is set equal. The speed difference Va2 at the upper reversing position P2 is set smaller than the speed difference Va1 at the reversing position P1, that is, at the upper reversing position P2, the speed difference Va2 of the rotation speed of the motor 11a between the low-speed operation mode and the high-speed operation mode is reduced. You may set so that it may become the smallest. Thereby, overrun at the upper reversal position of the wipers W1 and W2 affected by the traveling wind can be further prevented.

(4) Although the change mode of the rotation speeds VLx and VHx of the motor unit 11a is a sinusoidal change, the change mode (change shape) is not limited to this and may be changed as appropriate. For example, a rectangular wave, a triangular wave, or a trapezoidal wave change may be used.

-The wiping operation speeds of the wipers W1 and W2 are set to two stages of the low speed operation mode as the first speed mode and the high speed operation mode as the second speed mode. However, a mode in which three or more speed changes are performed may be adopted. .

-Although the speed control of the motor part 11a was set to PWM control, speed control other than PWM control may be used.
-Although the motor part 11a of the wiper motor 11 was a motor with a brush, the motor part 11a may be comprised by a brushless motor.

-Other than the above-mentioned embodiment and the above-mentioned modification examples, the configuration, control mode (operation mode), and the like of the vehicle wiper device 10 may be appropriately changed.
For example, although the wiper motor 11 of the motor with the speed reduction mechanism in which the motor unit 11a and the speed reduction unit 11b are integrally assembled is used, it may be configured separately. Although the wiper motor 11 and the link mechanism 12 are configured separately, a motor having a built-in link mechanism in the wiper motor may be used. Although the wiper motor 11 (motor unit 11a) operates the pair of wipers W1 and W2 for one wiper motor, the wiper motor may operate one wiper for one wiper device.

The technical idea that can be grasped from the embodiment and the modified example will be described.
(A) The wiper is reciprocally oscillated based on the rotational drive of the drive motor to perform the wiping operation on the outer surface of the windshield of the vehicle, and the operation speed of the wiper operation of the wiper is controlled by controlling the rotational speed of the drive motor. A first speed mode and a control device of the vehicle wiper device configured to be changeable to a second speed mode having an operation speed higher than the first speed mode,
In an end region including the wiper swing reversal position and an intermediate region between both end regions, the drive motor of the first speed mode and the second speed mode on at least one side of the end region is provided. A control device for a wiper device for a vehicle for controlling a rotation speed of the drive motor, wherein a speed difference in rotation speed is smaller than a speed difference in the intermediate region.

11a: motor unit (drive motor), 13: control circuit, FW: front windshield (windshield), W1, W2: wiper, P1: lower inversion position (inversion position), P2 ... upper inversion position (inversion position), A1: lower inversion side end area (end area), A2: upper inversion side end area (end area), A3: middle area, B: area, VLx: rotation speed, VHx: rotation speed, Va1: speed Difference, Va2: speed difference, Va3: speed difference, VLa: average speed, VHa: average speed.

Claims

A drive motor (11a);
A control circuit (13) for controlling the rotation speed of the drive motor,
The wiper device for a vehicle performs a wiping operation on an outer surface of a windshield (FW) of a vehicle by reciprocatingly oscillating a wiper (W1, W2) based on the rotational drive of the drive motor, and The rotational speed control of the wiper operation of the wiper operation speed can be changed to a first speed mode and a second speed mode of operation speed faster than the first speed mode,
The control circuit includes at least one of the end regions in both end regions (A1, A2) including the wiper swing reversal positions (P1, P2) and an intermediate region (A3) between the both end regions. The speed difference (Va1, Va2) between the rotation speeds (VLx, VHx) of the drive motor between the first speed mode and the second speed mode is smaller than the speed difference (Va3) in the intermediate region. A vehicle wiper device that controls the rotation speed of a motor.
The control circuit is set so that a speed difference between rotation speeds of the drive motor in the first speed mode and the second speed mode in both the end regions is smaller than a speed difference in the intermediate region. Item 4. The vehicle wiper device according to item 1.
The vehicle wiper device according to claim 1 or 2, wherein the control circuit changes the rotation speed of the drive motor into a sinusoidal change.
The control circuit is configured to control the rotation speed of the drive motor in the first speed mode and the rotation speed of the drive motor in the second speed mode of the wiper at the swing reverse position of the wiper at the first speed. The vehicle wiper device according to any one of claims 1 to 3, wherein the wiper device is set to be between an average speed (VLa) in the mode and an average speed (VHa) in the second speed mode.
The control circuit is configured to control the rotation speed of the drive motor in the first speed mode and the rotation speed of the drive motor in the second speed mode of the wiper at the swing reverse position of the wiper at the first speed. The vehicle wiper device according to claim 4, wherein the wiper device for a vehicle is set to be in a middle area (B) obtained by dividing the average speed in the mode and the average speed in the second speed mode into three equal parts.
The wiper reciprocates on an outer surface of the windshield (FW) between a lower turning position and an upper turning position,
3. The vehicle according to claim 2, wherein the control circuit is set such that a speed difference between a rotation speed of the drive motor in the first speed mode and a speed of the drive motor in the second speed mode is the smallest at the upper inversion position of the wiper. Wiper device.
7. The control circuit according to claim 1, wherein the control circuit rotates the drive motor forward or backward by an H-bridge circuit including a field effect transistor, and controls the rotation speed of the drive motor by pulse width modulation. 4. The wiper device for a vehicle according to claim 1.
Causing the wiper to reciprocate and swing on the outer surface of the windshield of the vehicle based on the rotational drive of the drive motor,
Changing the operation speed of the wiping operation of the wiper to a first speed mode and a second speed mode having an operation speed higher than the first speed mode by controlling the rotation speed of the drive motor. Control method,
In an end region including the wiper swing reversal position and an intermediate region between both end regions, the drive motor of the first speed mode and the second speed mode on at least one side of the end region is provided. A control method for a wiper device for a vehicle, wherein a speed difference of a rotation speed is smaller than a speed difference in the intermediate region, and a rotation speed of the drive motor is controlled.