JP6045449B2 - Wiper control device - Google Patents

Description

  The present invention relates to a wiper control device.

  In a wiper device that wipes off droplets adhering to the surface of an object with a wiper blade, the speed of the wiper blade rotating on the object can be switched in a plurality of stages by a switch operation. For example, in a wiper device that wipes the front window surface of a vehicle, the speed at which the wiper blade reciprocates on the front window is compared to the high-speed Hi operation mode and the Hi operation mode by operating the wiper switch in the passenger compartment. And a low-speed Lo operation mode.

  The rotation speed of the wiper blade is often controlled based on a speed map that defines the rotation speed of the wiper motor with respect to the rotation angle of the output shaft of the wiper motor. FIG. 5 is a diagram showing an example of a velocity map in a general wiper control device. In FIG. 5, the horizontal axis defines the rotation angle of the output shaft of the wiper motor, and the vertical axis defines the rotation speed of the wiper motor. The wiper control device controls the rotation speed of the wiper motor according to the Lo operation mode map 66 when the wiper switch is switched to “Lo”, and according to the Hi operation mode map 64 when the wiper switch is switched to “Hi”.

  Switching of the operation mode from the Lo operation mode to the Hi operation mode or from the Hi operation mode to the Lo operation mode is also performed when the wiper blade is rotating on the front window.

  In Patent Document 1, when the operation mode is switched while the wiper blade is rotating, the current speed is maintained until the wiper blade reaches the reversal position, and the operation mode after switching when the wiper blade reaches the reversal position. A wiper device is disclosed that achieves the following speed.

  FIG. 6 is a diagram in which switching of the operation mode from the Lo operation mode to the Hi operation mode by the wiper switch in the wiper device described in Patent Document 1 is associated with a change in the rotational speed of the wiper motor. In FIG. 6, the wiper switch is switched from “Lo” to “Hi” while the wiper blade is rotating from the upper reverse position to the lower reverse position, but the wiper motor maintains the rotation speed of the Lo operation mode. When the wiper blade reaches the lower reverse position after the wiper switch is switched, the wiper motor switches to the rotation speed of the Hi operation mode, and thereafter operates at the rotation speed of the Hi operation mode.

JP 2010-179910 A

  However, the wiper device described in Patent Document 1 does not change the speed at which the wiper blade rotates after the wiper switch is switched until the wiper blade reaches the reverse position. There was a problem that it was not possible.

  FIG. 7 is a diagram showing changes in the actual rotational speed of the wiper motor when the rotational speed of the wiper motor is rapidly changed in accordance with the operation of the wiper switch, unlike the invention described in Patent Document 1. In FIG. 7, when the wiper switch is switched from “Lo” to “Hi” while the wiper blade is rotating from the upper reverse position to the lower reverse position, the target speed 68 of the wiper motor is changed to the rotational speed of the Hi operation mode. ing. However, since the rotating wiper blade has inertia, it is difficult for the wiper blade to follow the rapid change in the rotation speed of the wiper motor. In addition, there is friction between the wiper blade and the front window, and the wiper blade is also subjected to wind pressure as the vehicle travels. Therefore, if the rotation speed of the wiper motor changes suddenly while the wiper blade is rotating, the rotation speed of the wiper motor becomes the actual speed 70 in FIG. 7, and so-called chattering occurs in which the rotation of the wiper blade becomes irregular. There was a problem.

  The present invention has been made in view of the above, and a wiper control device capable of changing the speed at which a wiper blade rotates according to the operation of a wiper switch while the wiper blade is rotating between an upper inverted position and a lower inverted position. The purpose is to provide.

In order to solve the above-described object, a wiper control device according to the first aspect of the present invention has a plurality of operation modes, and a wiper blade connected via a wiper arm by switching the operation modes is turned over on the windshield. A wiper switch that is operated when switching the rotational speed of the wiper motor that reciprocally rotates between the position and the lower reverse position to a different rotational speed, and the rotational speed of the wiper motor according to the operation mode switching operation by the wiper switch. And when the operation mode switching operation is performed by the wiper switch while the wiper blade is rotating between the upper reversal position and the lower reversal position, the rotation speed of the wiper motor is changed. Gradually from the rotation speed of the previous operation mode to the rotation speed of the operation mode after the switching operation It is of, in the middle of changing, if the wiper blade in the rotation reaches the upper reversal position or the lower reversing position, controls the rotation speed of the wiper motor to the rotational speed of the operation mode after the switching operation Rotation speed control means for rotating the wiper blade from the upper reverse position or the lower reverse position .

In the wiper control device according to claim 1, when the operation of switching the operation mode is performed by the wiper switch while the wiper blade is rotating, the rotation speed control unit performs the switching operation from the rotation speed of the operation mode before the switching operation. Gradually change to the rotation speed of the operation mode. Since the wiper blade performs control to gradually change the rotational speed while the wiper blade is rotating, the wiper blade rotates according to the operation of the wiper switch while the wiper blade rotates between the upper reverse position and the lower reverse position. You can change the speed.

When the rotation speed control means gradually changes the rotation speed of the wiper motor and the wiper blade reaches the upper reverse position or the lower reverse position, the rotation speed of the wiper motor is controlled to the rotation speed of the operation mode after the switching operation. To do. With this control, the speed at which the wiper blade rotates can be quickly changed according to the operation of the wiper switch.

In order to solve the above-described object, a wiper control device according to the invention described in claim 2 has a plurality of operation modes, and the wiper blades connected via the wiper arm by switching the operation modes are turned over on the windshield. A wiper switch that is operated when the rotational speed of the wiper motor that reciprocally rotates between the position and the lower reverse position is switched to a different rotational speed, and the rotation of the wiper blade between the upper reverse position and the lower reverse position. Rotation angle detection means for detecting the rotation angle of the output shaft of the wiper motor corresponding to the rotation angle of the output shaft detected by the rotation angle detection means for the rotation speed of the wiper motor corresponding to each of the plurality of operation modes. And the wiper blade is moved by the wiper switch while the wiper blade is rotating between the upper reverse position and the lower reverse position. When the operation mode is switched, the switching speed of the operation mode before the switching operation changed according to the rotation angle of the output shaft is changed according to the rotation angle of the output shaft. Rotational speed control means for gradually changing the rotational speed to the rotational speed of the operation mode after operation.

According to this wiper control device, even when the rotation speed of the wiper motor changes according to the rotation angle of the output shaft, the speed at which the wiper blade rotates can be quickly changed according to the operation of the wiper switch.

The wiper control device according to claim 3, wherein the rotational speed control means gradually changes the rotational speed of the wiper motor from the rotational speed of the operation mode before the switching operation to the rotational speed of the operation mode after the switching operation. When the rotating wiper blade reaches the upper reverse position or the lower reverse position, the rotation speed of the wiper motor is controlled to the rotation speed of the operation mode after the switching operation, and the wiper blade is It is rotated from the upper inversion position or the lower inversion position.

According to this wiper control device, when the rotation speed control means gradually changes the rotation speed of the wiper motor, and the wiper blade reaches the upper reverse position or the lower reverse position, the rotation speed of the wiper motor is switched after the switching operation. Control the rotation speed of the operation mode. With this control, the speed at which the wiper blade rotates can be quickly changed according to the operation of the wiper switch.

  The wiper control device according to claim 4, wherein the rotation speed control means performs the gradual change in the rotation speed of the wiper motor in a stepwise manner, thereby changing the rotation speed of the wiper motor in an operation mode before the switching operation. The rotational speed is changed stepwise from the rotational speed of the operation mode after the switching operation.

  According to this wiper control device, the rotational speed of the wiper blade can be quickly changed according to the operation of the wiper switch by changing the rotational speed stepwise.

  The wiper control device according to claim 5, wherein the rotation speed control means makes the rotation speed of the wiper motor rotate in the operation mode before the switching operation by making the gradual change in the rotation speed of the wiper motor more detailed. The speed is continuously changed from the speed to the rotational speed of the operation mode after the switching operation.

  According to this wiper control device, the speed at which the wiper blade rotates can be changed quickly and smoothly according to the operation of the wiper switch by making the control interval of the rotation speed closer.

It is the schematic which shows the structure of the wiper apparatus containing the wiper control apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the operation mode transfer process in the wiper control apparatus which concerns on embodiment of this invention. It is a flowchart which shows an example of the operation mode transfer process in the wiper control apparatus which concerns on embodiment of this invention. It is a figure which shows an example when calculation of target rotational speed is not performed by the frequency | count of transfer by the operation mode transfer process in the wiper control apparatus which concerns on embodiment of this invention. It is the figure which showed an example of the speed map in a common wiper control apparatus. FIG. 10 is a diagram in which switching of an operation mode from a Lo operation mode to a Hi operation mode by a wiper switch in the wiper device described in Patent Literature 1 is associated with a change in the rotation speed of the wiper motor. It is a figure which shows the change of the actual rotational speed of a wiper motor at the time of changing the rotational speed of a wiper motor rapidly according to operation of a wiper switch.

  FIG. 1 is a schematic diagram showing a configuration of a wiper device 10 including a wiper control device 22 according to the present embodiment. The wiper device 10 is for wiping a front window 12 provided in a vehicle such as a passenger car, for example, and includes a pair of wipers 14 and 16, a wiper motor 18, a link mechanism 20, and a wiper control device 22. It has.

  The wipers 14 and 16 include wiper arms 24 and 26 and wiper blades 28 and 30, respectively. The base end portions of the wiper arms 24 and 26 are respectively fixed to pivot shafts 42 and 44 described later, and the wiper blades 28 and 30 are respectively fixed to the distal end portions of the wiper arms 24 and 26.

  In the wipers 14 and 16, the wiper blades 28 and 30 reciprocate on the front window 12 as the wiper arms 24 and 26 rotate, and the wiper blades 28 and 30 wipe the front window 12.

  The wiper motor 18 has an output shaft 32 that can rotate forward and reverse via a speed reduction mechanism 52 mainly composed of a worm gear. The link mechanism 20 includes a crank arm 34, a first link rod 36, and a pair of pivots. Lever 38, 40, a pair of pivot shafts 42, 44, and a second link rod 46 are provided.

  One end side of the crank arm 34 is fixed to the output shaft 32, and the other end side of the crank arm 34 is rotatably connected to one end side of the first link rod 36. Further, the other end side of the first link rod 36 is rotatably connected to a position near the end different from the end having the pivot shaft 42 of the pivot lever 38, and the end having the pivot shaft 42 of the pivot lever 38. Both ends of the second link rod 46 are rotatably connected to the end different from the above and the end of the pivot lever 40 corresponding to the end of the pivot lever 38.

  The pivot shafts 42 and 44 are rotatably supported by a pivot holder (not shown) provided on the vehicle body, and the ends of the pivot levers 38 and 40 having the pivot shafts 42 and 44 are connected to the pivot shafts 42 and 44. The wiper arms 24 and 26 are fixed to each other.

  In the wiper device 10 according to the present embodiment, when the output shaft 32 rotates forward and backward within the rotation range θ, the rotational force of the output shaft 32 is transmitted to the wiper arms 24 and 26 via the link mechanism 20. As the wiper arms 24 and 26 reciprocate, the wiper blades 28 and 30 reciprocate between the lower inversion position P2 and the upper inversion position P1 on the front window 12.

  In the wiper device 10 according to the present embodiment, as shown in FIG. 1, when the wiper blades 28 and 30 are positioned at the lower inversion position P2, the crank arm 34 and the first link rod 36 are linear. It is set as the structure which makes.

  Further, the wiper device 10 according to the present embodiment changes the length of each lever of the link mechanism 20 and the position of each link, so that the wiper blades 28 and 30 are inverted every time the output shaft 32 rotates once. You may make it reciprocate between the position P2 and the upper inversion position P1.

  A wiper controller 22 for controlling the rotation of the wiper motor 18 is connected to the wiper motor 18. The wiper control device 22 according to the present embodiment generates, for example, a sensor 54 for detecting the rotation speed and rotation angle of the output shaft 32 of the wiper motor 18 and a current for operating the wiper motor 18 by PWM (Pulse Width Modulation) control. The drive circuit 56 is supplied to the wiper motor 18.

  If the wiper motor 18 is a brushless DC motor, the drive circuit 56 includes an inverter circuit using a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) as a switching element. The drive circuit 56 outputs a current having a predetermined duty ratio under the control of an inverter circuit by a microcomputer 58 described later.

  Since the wiper motor 18 according to the present embodiment has the speed reduction mechanism 52 as described above, the rotation speed and rotation angle of the output shaft 32 are not the same as the rotation speed and rotation angle of the wiper motor body. However, in the present embodiment, since the wiper motor main body and the speed reduction mechanism 52 are inseparably configured, hereinafter, the rotation speed and rotation angle of the output shaft 32 are regarded as the rotation speed and rotation angle of the wiper motor 18. .

  The sensor 54 is provided in the speed reduction mechanism 52 of the wiper motor 18 and includes an element (for example, a Hall IC) for detecting a magnetic field (magnetic force) of a magnet that rotates in conjunction with the output shaft 32. Detects the rotation angle.

  The wiper control device 22 is connected to the memory 60 storing the speed map shown in FIG. 5 and the wiper switch 50. When the wiper switch 50 is turned on, the drive circuit according to the speed map stored in the memory 60 is provided. And a microcomputer 58 for controlling 56.

  The speed map stored in the memory 60 is that of the wiper motor 18 according to the rotation angle of the output shaft 32 corresponding to the rotation between the upper reversal position P1 and the lower reversal position P2 of the wiper blades 28, 30 as shown in FIG. Specifies the rotation speed. Further, the microcomputer 58 controls the drive circuit 56 so that the rotational speed of the output shaft 32 changes according to the rotational angle of the output shaft based on the rotational angle and speed map of the output shaft 32 detected by the sensor 54.

  The speed map in FIG. 5 describes a Hi operation mode speed map 64 and a Lo operation mode speed map 66, but either one of the Hi operation mode speed map 64 or the Lo operation mode speed map 66 is stored in the memory 60. You may remember. When only the Lo operation mode speed map 66 is stored in the memory 60, the rotation speed related to the Hi operation mode speed map 64 is obtained by multiplying the rotation speed of the wiper motor 18 indicated by the Lo operation mode speed map 66 by a predetermined coefficient of 1 or more. Speed can be calculated. When only the Hi operation mode speed map 64 is stored in the memory 60, the Lo operation mode speed map is obtained by multiplying the rotational speed of the wiper motor 18 indicated by the Hi operation mode speed map 64 by a predetermined positive coefficient less than 1. 66 can be calculated.

  Further, since the locus of the Lo operation mode speed map 66 shown in FIG. 5 can be regarded as a quadratic curve such as an ellipse, the change in the rotation speed of the wiper motor 18 corresponds to the rotation angle of the output shaft 32. Can be described as a quadratic equation. In the present embodiment, the rotational speed of the wiper motor 18 corresponding to the rotational angle of the output shaft 32 may be calculated using such an equation.

  The wiper switch 50 is a switch that turns on or off the power supplied from the vehicle battery to the wiper motor 18. The wiper switch 50 includes “Lo” for rotating the wiper blades 28 and 30 at a low speed, “Hi” for rotating at a high speed, “INIT” for rotating at a constant cycle, and “OFF” for stopping the wiper blades 28 and 30. It is possible to switch to the operation mode selection position. In addition, a signal corresponding to the selected position of each operation mode is output to the microcomputer 58.

  When a signal output from the wiper switch 50 according to the selected position of each operation mode is input to the microcomputer 58, the microcomputer 58 selects a speed map corresponding to the selected position of the wiper switch 50 from the memory 60, The drive circuit 56 is controlled based on the selected speed map and the rotation angle of the output shaft detected by the sensor 54.

  FIG. 2 is a diagram showing an example of operation mode transition processing of the wiper motor 18 of the wiper control device 22 according to the embodiment of the present invention. In FIG. 2, time is plotted on the vertical axis, and the rotational speed of the wiper motor 18 is set on the horizontal axis, and the control cycle of the microcomputer 58 is divided by a one-dot chain line. In FIG. 2, the rotation speed of the wiper motor 18 is controlled according to the Lo operation mode map 66 until the wiper switch 50 is switched from “Lo” to “Hi”.

  When the wiper switch 50 is switched from “Lo” to “Hi”, the operation mode transition period 72 starts. The microcomputer 58 refers to the Hi operation mode map 64 and the Lo operation mode map 66 one control cycle after the start of the operation mode transition period 72, and sets the Hi operation mode target rotation speed NH and the Lo operation mode target rotation speed NL. To calculate the first target rotational speed NT1. Further, the microcomputer 58 controls the drive circuit 56 so that the rotation speed of the wiper motor 18 becomes the first target rotation speed NT1.

The first target rotational speed NT1 is calculated by the following equation (1).
NT1 = NL + (NH-NL) × 1 / N (1)

  In the above equation (1), N is a natural number equal to or greater than 1, and indicates the number of transitions for calculating the target rotational speed before the rotational speed of the wiper motor 18 transitions from the Lo operation mode to the Hi operation mode. NL is the target rotational speed in the Lo operation mode at the time of calculating the first target rotational speed NT1, and NH is the target rotational speed in the Hi operation mode at the time of calculating the first target rotational speed NT1.

  In the present embodiment, as an example, in the operation mode transition period 72, after calculating the first target rotational speed NT1, the second target rotational speed NT2, the third target rotational speed NT3, and the fourth target rotational speed NT4 for each control cycle CT. The fifth target rotation speed NT5 and the sixth target rotation speed are sequentially calculated. When calculating from the first target rotational speed NT1 to the sixth target rotational speed NT6 as shown in FIG. 2, N = 6.

  The target rotational speed calculated in the operation mode transition period 72 gradually increases step by step as shown in FIG. 2, but the stepwise change in the target rotational speed decreases as the value of the number of transitions N increases. In response to the operation of the wiper switch 50, the rotational speed of the wiper motor 18 can be changed smoothly. In the present embodiment, the value of N can be arbitrarily set, and if priority is given to reducing the load of arithmetic processing over smooth change of the rotational speed of the wiper motor 18, the value of N is made smaller.

  In the present embodiment, the rotational speed of the wiper motor 18 may be continuously changed by shortening the control cycle CT and increasing the number of transitions N to change the rotational speed of the wiper motor 18 more finely. Is possible. The control cycle CT is 20 to 100 milliseconds as an example, but may be shortened to several milliseconds. Further, the number of transitions N is 6 in FIG. 2, but may be 10 or more.

The second target rotational speed NT2, the third target rotational speed NT3, the fourth target rotational speed NT4, the fifth target rotational speed NT5, and the sixth target rotational speed together with the first target rotational speed NT1 It can be calculated by the following formula (2).
NTM = NL + (NH-NL) × M / N (2)

  In the above equation (2), M is a natural number greater than or equal to 1 and less than or equal to N, and indicates what number the target rotation speed is calculated from the start of the operation mode transition period 72. For example, it is 1 for calculating the first target rotational speed NT1, 2 for calculating the second target rotational speed NT2, and 6 for calculating the sixth target rotational speed NT6. NL is a target rotational speed in the Lo operation mode when each target rotational speed is calculated, and NH is a target rotational speed in the Hi operation mode when each target rotational speed is calculated.

  In the present embodiment, after the operation of the wiper switch 50, the rotation speed of the wiper motor 18 is gradually increased from the target rotation speed in the Lo operation mode to the target rotation speed in the Hi operation mode, for example, by calculation using the above equation (2). Let

  In the case of FIG. 2 where M = 6, the target rotational speed sequentially calculated from the start of the operation mode transition period 72 approaches the target rotational speed of the Hi operation mode, and is calculated at the end of the operation mode transition period 72. The sixth target rotation speed NT6 matches the target rotation speed in the Hi operation mode.

Note that FIG. 2 and Expression (2) describe the case of shifting from the Lo operation mode to the Hi operation mode. However, by using the following Expression (3), the case of shifting from the Hi operation mode to the Lo operation mode is described. The target rotation speed can be calculated.
NTM = NH- (NH-NL) × M / N (3)

  As described above, the microcomputer 58 determines the rotation speed of the operation mode before switching at the rotation angle of the output shaft 32 detected by the sensor 54 for each control cycle CT, and the rotation speed of the operation mode after switching at the same rotation angle. Gradually change.

  FIG. 3 is a flowchart showing an example of operation mode transition processing in the wiper control device 22 according to the present embodiment. In step 300, the number of transitions N is set. In the present embodiment, as an example, N = 6 as shown in FIG.

  In step 302, the M counter of the formula (2) or the formula (3) is set, and M = 1 is set. In step 304, it is determined whether or not the wiper switch 50 has been switched. If the determination is affirmative, in step 306, the target in the operation mode transition period 72 is calculated using the above-described equation (2) or equation (3). Calculate the rotation speed.

  In step 308, the wiper motor 18 is controlled so as to achieve the target rotational speed calculated in step 306. More specifically, the microcomputer 58 controls the drive circuit 56 that modulates the voltage applied to the wiper motor 18 so that the rotational speed of the wiper motor 18 becomes the target rotational speed calculated in step 306.

  In step 310, 1 is added to the M counter, and in step 312, it is determined whether or not the M counter added in step 310 is greater than or equal to the number of transitions N. If the determination in step 312 is affirmative, the calculation of the target rotational speed in the operation mode transition period 72 and the control of the rotational speed of the wiper motor 18 at the calculated target rotational speed are complete. Control of the wiper motor 18 in the subsequent operation mode is started, and the operation mode transition processing is ended.

  If the determination in step 312 is negative, it is determined in step 316 whether or not the calculated target rotational speed is zero. If the determination in step 316 is affirmative, the procedure proceeds to step 314. If the determination in step 316 is negative, the procedure proceeds to step 306 and calculation of the target rotational speed and control of the wiper motor 18 are continued. .

  An example in the case of a positive determination in step 316 is shown in FIG. FIG. 4 is a diagram illustrating an example of the case where the calculation of the target rotation speed is not executed with the number of transitions in the operation mode transition process in the wiper control device 22 according to the present embodiment. In FIG. 4, the wiper switch 50 is switched when the wiper blades 28 and 30 are closer to the upper reversal position than in the case of FIG. 2, and the operation mode transition period 72 starts.

  In the operation mode transition period 72 of FIG. 4, the target rotational speed is calculated for each control cycle CT using the above-described equation (2). However, even when the number of transitions N is N = 6 as in FIG. 2, the wiper blades 28 and 30 reach the upper reversal position when calculating the fifth target rotational speed NT5, so NL = NH = NT5 = 0 It becomes.

  As shown in FIG. 4, when the wiper switch 50 is operated in a state where the wiper blades 28 and 30 are close to the reversal position of the upper reversal position or the lower reversal position, the target rotational speed is calculated for each control cycle CT. The wiper blades 28 and 30 reach the reverse position before being executed at the transition number N.

  However, when the wiper blades 28 and 30 reach the reverse position, the target rotational speed in the Hi operation mode, the target rotational speed in the Lo operation mode, and the target rotational speed calculated in the operation mode transition process are all zero. If the target rotational speed is 0, that is, the wiper blade is stopped at the reverse position, the control can be shifted from the reverse position to control in an arbitrary operation mode. Therefore, in this embodiment, even when the wiper blades 28 and 30 reach the reverse position before the target rotation speed is calculated N times, there is no problem in the process of changing the operation mode according to the operation of the wiper switch 50. .

  In the present embodiment, even if calculation of the target rotational speed in the operation mode transition period 72 is not executed N times that is the number of transitions, if the calculated target rotational speed becomes 0, the operation by operating the wiper switch 50 Assuming that the mode transition has been completed, the operation mode transition process is terminated.

  As described above, in the present embodiment, after the wiper switch 50 is operated, the drive circuit 56 is set so that the rotational speed of the wiper motor 18 becomes the target rotational speed calculated using the above formula (2) or formula (3). Is controlling. With this control, the speed at which the wiper blades 28 and 30 rotate can be changed quickly and smoothly according to the operation of the wiper switch 50.

DESCRIPTION OF SYMBOLS 10 ... Wiper apparatus, 12 ... Front window, 14 ... Wiper, 18 ... Wiper motor, 20 ... Link mechanism, 22 ... Wiper control apparatus, 24, 26 ... Wiper arm, 28 , 30 ... wiper blade, 32 ... output shaft, 34 ... crank arm, 36 ... link rod, 38, 40 ... pivot lever, 42, 44 ... pivot shaft, 46 ... Link rod, 50 ... Wiper switch, 52 ... Deceleration mechanism, 54 ... Sensor, 56 ... Drive circuit, 58 ... Microcomputer, 60 ... Memory, 64 ... Hi operation Mode map, 66 ... Lo operation mode map, 68 ... target speed, 70 ... actual speed, 72 ... operation mode transition period, CT ... control cycle, NH ... Hi operation mode Target rotational speed, NL: Lo operation mode target rotational speed, NT1: First target rotational speed, NT2: Second target rotational speed, NT3: Third target rotational speed, NT4: First 4 target rotational speed, NT5 ... fifth target rotational speed, NT6 ... sixth target rotational speed, P1 ... upper reverse position, P2 ... lower reverse position, θ ... rotation range

Claims (5)

Different rotation speeds of the wiper motor that has multiple operation modes and reciprocally rotates the wiper blades connected via the wiper arm by switching between the operation modes between the upper and lower inversion positions on the windshield. Wiper switch operated when switching to
The rotation speed of the wiper motor is controlled according to the operation mode switching operation by the wiper switch, and the operation by the wiper switch is performed while the wiper blade rotates between the upper reverse position and the lower reverse position. If switching operation mode is, the rotational speed of the wiper motor is gradually changed from the rotational speed of the operation mode before the switching operation until the rotational speed of the operation mode after the switching operation, in the course of changing the turning When the wiper blade in the middle reaches the upper reverse position or the lower reverse position, the rotational speed of the wiper motor is controlled to the rotational speed of the operation mode after the switching operation to move the wiper blade to the upper reverse position or Rotational speed control means for rotating from the lower inversion position ;
Wiper control device with Different rotation speeds of the wiper motor that has multiple operation modes and reciprocally rotates the wiper blades connected via the wiper arm by switching between the operation modes between the upper and lower inversion positions on the windshield. Wiper switch operated when switching to
A rotation angle detecting means for detecting a rotation angle of the output shaft of the wiper motor corresponding to the rotation between the upper reverse position and the lower reverse position of the wiper blade;
The rotation speed of the wiper motor corresponding to each of the plurality of operation modes is changed according to the rotation angle of the output shaft detected by the rotation angle detection means , and the wiper blade is moved to the upper reversal position and the lower reversal position. When the operation mode switching operation is performed by the wiper switch while rotating between, the rotational speed of the operation mode before the switching operation changed according to the rotation angle of the output shaft is set as the output shaft. A rotational speed control means for gradually changing to the rotational speed of the operation mode after the switching operation changed according to the rotational angle of
Wiper control device with The rotational speed control means is configured to gradually change the rotational speed of the wiper motor from the rotational speed of the operation mode before the switching operation to the rotational speed of the operation mode after the switching operation. When the upper reverse position or the lower reverse position is reached, the rotation speed of the wiper motor is controlled to the rotation speed of the operation mode after the switching operation, and the wiper blade is rotated from the upper reverse position or the lower reverse position. The wiper control device according to claim 2 to be moved.   The rotational speed control means performs the gradual change in the rotational speed of the wiper motor in steps to change the rotational speed of the wiper motor from the rotational speed of the operational mode before the switching operation to the operational mode after the switching operation. The wiper control device according to claim 1, wherein the wiper control device changes the rotation speed stepwise. The rotation speed control means makes the rotation speed of the wiper motor rotate from the rotation speed of the operation mode before the switching operation to the rotation of the operation mode after the switching operation by making the gradual change in the rotation speed of the wiper motor finer. The wiper control device according to any one of claims 1 to 3, wherein the wiper control device is continuously changed to a speed.

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