JP6610298B2 - WIPER WIPER CONTROL DEVICE AND VEHICLE WIPER CONTROL PROGRAM - Google Patents

Description

  The present invention relates to a vehicle wiper control device and a vehicle wiper control program.

  In Patent Document 1, an external force (load) acting on a wiper blade and a blade angle are calculated based on a current value flowing through the wiper motor and a motor angle detected by a rotation sensor, and fed back to a command signal for rotating the wiper motor. Has been proposed. Thereby, the wiper motor can be controlled in consideration of the external force.

  In Patent Documents 2 and 3, a predetermined frequency component is extracted by a filter from a signal related to the rotation angle of the wiper motor, and the command signal of the wiper motor is corrected by using the extracted frequency component, thereby suppressing chatter vibration of the wiper blade. It has been proposed to suppress.

JP2015-96397A JP-A-2015-85759 JP2015-189283A

  However, in Patent Document 1, it is possible to control the wiper motor in consideration of external force, but it is not possible to suppress the sound when the wiper blade is reversed.

  Also, in Patent Documents 2 and 3, although the chatter vibration of the wiper blade can be suppressed, the sound when the wiper blade is reversed cannot be suppressed.

  As a method of reducing the sound at the time of reversing the wiper blade, a method of reducing the pressure to suppress the windshield glass of the wiper arm, a method of changing the rubber material of the wiper blade, etc. are conceivable. It is in contradiction with deterioration, and it is difficult to achieve both.

  The present invention has been made in consideration of the above facts, and provides a vehicle wiper control device and a vehicle wiper control program capable of reducing a sound when a wiper wiping operation is reversed while maintaining wiping performance. The purpose is to provide.

A vehicle wiper control device according to the present invention includes a wiper motor for performing a wiper blade reciprocating wiper operation on a windshield glass of a vehicle, and a control unit for controlling a driving voltage of the wiper motor to perform the wiper wiping operation. And a superimposing unit that superimposes a signal having a predetermined frequency on the driving voltage in order to reduce the reversal sound of the wiper blade during the reversal of the wiper blade .

  According to the vehicle wiper control device configured as described above, the wiper motor performs a reciprocating wiper wiping operation on the windshield glass of the vehicle.

  In the control unit, the driving voltage of the wiper motor is controlled, and thereby the wiper blade reciprocating wiper wiping operation is performed.

The superimposing unit superimposes a signal having a predetermined frequency on the driving voltage in order to reduce the reversal sound of the wiper blade during the reversal of the wiper blade . By superimposing a signal having a predetermined frequency on the drive voltage, the acceleration in the wiper wiping direction when the wiper wiping operation is reversed is suppressed. Thereby, the sound at the time of reversal of wiper wiping operation can be reduced, maintaining wiping performance.

The vehicle wiper control apparatus of the present invention, the superimposing unit, the wiper blades at each reciprocation of the wiper wiping operation starts the overlap of the last issue relaxin at the timing of starting the inversion.

According to the vehicle wiper control device having the above-described configuration, it is possible to reliably superimpose a signal having a predetermined frequency at the time of reversal, which is a timing necessary for reducing the reversal sound, on the drive voltage, and at times other than the necessary timing . it is possible to suppress the superposition of the drive voltage signal.

  In the vehicle wiper control device according to the present invention, the timing at which the wiper blade starts to reverse is the timing at which the speed of the wiper wiping operation becomes 0 when the wiper blade reverses in each reciprocation of the wiper wiping operation.

  According to the vehicle wiper control device configured as described above, the timing at which the wiper blade starts reversal can be detected by detecting the timing at which the speed of the wiper wiping operation is zero when reversing each time the wiper wiping operation is reciprocated. is there.

The vehicle wiper control apparatus of the present invention, the superimposing unit, the last issue connexin before timing wiping surface wiper wiping operation abuts inverts the windshield glass of the wiper blade is inverted to the opposite side Start superimposing.

According to the vehicle wiper control apparatus having the above structure, it is possible to further suppress the superposition of the drive voltage of the signal other than a necessary timing.

  The vehicle wiper control program of the present invention causes a computer to function as the control unit and the superimposing unit of the vehicle wiper control device.

  According to the vehicle wiper control program having the above-described configuration, it is possible to reduce a sound when the wiper wiping operation is reversed.

It is the schematic which shows the structure of the vehicle wiper apparatus containing the vehicle wiper control apparatus which concerns on this embodiment. It is the schematic which shows an example of the control block diagram in the wiper device for vehicles concerning this embodiment. It is a figure for demonstrating the generation principle of the inversion sound of a wiper blade. (A) is a figure which shows the lateral direction angular acceleration of a wiper blade, and the force which hits glass, (B) shows the observation direction of the wiper blade in (A). (A) is a figure which shows the motor angle of the inversion position vicinity, (B) is a figure which shows (B) lateral direction acceleration, (C) is a figure which shows an example (100HZ) of a high frequency signal. It is a flowchart which shows an example of the process performed in the inversion sound reduction control part in the wiper control device for vehicles concerning this embodiment.

  Hereinafter, an example of this embodiment will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram illustrating a configuration of a vehicle wiper device including a vehicle wiper control device according to the present embodiment.

  The vehicle wiper device 11 is for wiping a windshield glass 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 vehicle. And a wiper control device 10.

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

  In the wipers 14 and 16, the wiper blades 28 and 30 reciprocate on the windshield glass 12 in accordance with the operation of the wiper arms 24 and 26, and the wiper blades 28 and 30 wipe the windshield glass 12.

  The wiper motor 18 has an output shaft 32 that can rotate forward and backward 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, a pair of pivot levers 38 and 40, a pair of pivot shafts 42 and 44, and a second link rod 46.

  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 operably connected to one end side of the first link rod 36. Further, the other end side of the first link rod 36 is operatively connected to a position near the end different from the end having the pivot shaft 42 of the pivot lever 38. Both ends of the second link rod 46 are operatively connected to an end different from the end having the pivot shaft 42 of the pivot lever 38 and an end corresponding to the end of the pivot lever 38 in the pivot lever 40.

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

  In the vehicle wiper device 11, when the output shaft 32 rotates forward and backward at a rotation angle θ 1 within a predetermined range, 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 windshield glass 12. The value of θ1 may take various values depending on the configuration of the link mechanism of the wiper device, but in the present embodiment, it is 140 ° as an example.

  In the vehicle wiper device 11 according to the present embodiment, as shown in FIG. 1, when the wiper blades 28 and 30 are positioned at the storage position P3, the crank arm 34 and the first link rod 36 are linear. It is set as the structure which makes.

  The storage position P3 is provided below the lower inversion position P2. The wiper blades 28 and 30 are moved to the retracted position P3 by rotating the output shaft 32 by θ2 from the state where the wiper blades 28 and 30 are in the lower inversion position P2. Although the value of θ2 can take various values depending on the configuration of the link mechanism of the wiper device, etc., in this embodiment, it is set to 10 ° as an example.

  When θ2 is “0”, the lower inversion position P2 coincides with the storage position P3, and the wiper blades 28 and 30 are stopped and stored at the lower inversion position P2.

  The wiper motor 18 is connected to a vehicle wiper control device 10 for controlling the rotation of the wiper motor 18. That is, a reciprocating wiper wiping operation on the windshield glass 12 is performed by driving the wiper motor 18. The vehicle wiper control device 10 according to the present embodiment includes, for example, a rotation angle sensor 54 and a current sensor 55 that detect the rotation speed and rotation angle of the output shaft 32 of the wiper motor 18. Further, the vehicle wiper control device 10 includes a drive circuit 56 that generates a current for operating the wiper motor 18 by PWM control and supplies the current to the wiper motor 18.

  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 rotation shaft of the wiper motor main 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 rotation shaft of the wiper motor 18. And

  The rotation angle sensor 54 is provided in the speed reduction mechanism 52 of the wiper motor 18 and detects a magnetic field (magnetic force) of an excitation coil or a magnet that rotates in conjunction with the output shaft 32 by converting it into a current. The current sensor 55 detects the current of the rotating wiper motor 18.

  The vehicle wiper control device 10 includes a microcomputer 58 that controls a wiper wiping operation. The microcomputer 58 can calculate the position of the wiper blade on the windshield glass 12 from the rotation angle of the output shaft 32 detected by the rotation angle sensor 54 so that the rotation speed of the output shaft 32 changes according to the position. The drive circuit 56 is controlled. The vehicle wiper control device 10 is provided with a memory 60 that is a storage device that stores data and programs used to control the drive circuit 56. The memory 60 stores data and a program for calculating the rotation speed of the output shaft 32 in accordance with the position of the wiper blades 28 and 30 on the windshield glass 12.

  The microcomputer 58 is connected to a wiper switch 50, a vehicle ECU (Electronic Control Unit) 90 that controls the vehicle engine and the like, and a washer switch 62.

  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 is a low-speed operation (LO) mode selection position for operating the wiper blades 28 and 30 at a low speed, a high-speed operation (HI) mode selection position for operating at a high speed, and an intermittent operation (INT) operating intermittently at a constant cycle. ) It is possible to switch between a mode selection position and a storage (stop) mode selection position. In addition, a rotation speed command signal corresponding to the selected position in each mode is output to the microcomputer 58.

  When a signal output from the wiper switch 50 according to the selected position of each mode is input to the microcomputer 58, the microcomputer 58 performs control corresponding to the output signal from the wiper switch 50 in the data stored in the memory 60 and Use a program.

  FIG. 2 is a schematic diagram illustrating an example of a control block diagram in the vehicle wiper device 11 according to the present embodiment.

  In FIG. 2, for example, a command value for rotating the wiper blades 28 and 30 by the windshield glass 12 at a desired rotation angle is input to the PI control unit 64 in the microcomputer 58.

  The PI control unit 64 calculates the voltage applied to the armature 66 of the wiper motor 18 by so-called PI control. The PI control unit 64 includes a deviation proportional unit that calculates a voltage to be applied to the wiper motor 18 based on a proportional relationship of a deviation between a voltage calculated using a command value and a voltage calculated using an output value described below, and the proportional relationship described above. Only when a residual deviation occurs, a deviation integration unit that eliminates the residual deviation by deviation integration is included.

  The voltage calculated by the PI control unit 64 is applied to the armature 66 of the wiper motor 18 and starts rotating based on the above-described command value. The rotation angle of the output shaft of the wiper motor 18 is detected by the rotation angle sensor 54. The current of the rotating wiper motor 18 is detected by the current sensor 55, and the torque of the output shaft of the wiper motor 18 is calculated by multiplying the detected current value by a predetermined torque constant 68.

  Further, the rotational force and torque of the wiper motor 18 act on the vehicle wiper device 11 to rotate the wiper blades 28 and 30 from a predetermined position on the windshield glass 12. Further, the motor angle information detected by the rotation angle sensor 54 is input as an output value to the PI control unit 64, and the above-described PI control is performed. Note that Ke in FIG. 2 is a predetermined counter electromotive constant 70 relating to the counter electromotive voltage generated in association with the operation of the vehicle wiper device 11, and is used when the current value of the wiper motor is calculated from the voltage applied to the wiper motor. To do.

  In the present embodiment, a reversing sound reduction control unit 72 that performs control to reduce the sound during reversal of the wiper blades 28 and 30 is provided in the microcomputer 58, and the voltage calculated by the PI control unit 64 is set to the voltage. A signal for reducing the inverted sound is superimposed.

  Here, in describing the signal for reducing the inverted sound, the principle of generating the inverted sound will be described. FIG. 3 is a view for explaining the generation principle of the inverted sound of the wiper blades 28 and 30. In FIG. 3, the vehicle wiper device 11 is shown in a simplified manner. Hereinafter, a portion of the wiper blades 28 and 30 that contacts the windshield glass 12 of the blade rubber portion is referred to as a lip 74, and a portion of the wiper blades 28 and 30 that is supported by the frame of the blade rubber portion is referred to as a regulating portion 78. Called. Further, a portion having a wider cross-sectional width than the lip 74 of the blade rubber portion is referred to as a shoulder 80, and a portion where the cross section between the shoulder 80 and the restricting portion 78 is narrowed is referred to as a neck 76.

  When the wiper blades 28 and 30 are reversed at the upper reversal position P1 and the lower reversal position P2, the wiper blades 28 and 30 strike the glass to resonate automobile pillars and the like. To do.

  For example, as shown in FIG. 3, when the wiper blades 28, 30 move to the lower inversion position P <b> 2, the lip 74 of the wiper blades 28, 30 is bent at the neck 76, and is in a rearward direction with respect to the regulating portion 78. Move with. When the wiper blades 28 and 30 are moved to the lower reverse position, the movement direction of the wiper blades 28 and 30 is reversed to the upper reverse position direction. There is no bending with the lip 74, and a linear state is obtained. Then, the wiper blades 28 and 30 further move in the direction of the upper reversal position, and the restricting portions 78 of the wiper blades 28 and 30 get over the lip 74. When the restricting portion 78 gets over the lip 74, the neck 76 is bent in the opposite direction, and the wiping surface that contacts the windshield glass 12 of the lip 74 of the wiper blades 28, 30 is reversed to the opposite surface. At this time, the restricting portion 78 of the wiper blades 28 and 30 and the shoulder 80 strike each other to hit the glass, and a reversal sound is generated due to resonance of pillars and the like.

  The reversing sound can reduce the reversing sound by reducing the angular acceleration in the moving direction of the wiper blades 28 and 30 (hereinafter referred to as the lateral direction) to lower the force of hitting the glass (FIG. 4A). it can. 4A shows the lateral angular acceleration of the wiper blade and the force of hitting the glass, and FIG. 4B shows the observation direction of the wiper blades 28 and 30 in FIG. 4A.

  As a method of reducing the angular acceleration in the lateral direction, there is a method of decelerating in the vicinity of the reversal position. However, it is necessary to wipe off partway faster, and the movement becomes unnatural. Although a method of decelerating instantaneously is conceivable, the timing of deceleration is difficult, and if the timing is shifted, another problem may occur.

  Therefore, in this embodiment, the inverted sound reduction control unit 72 superimposes a predetermined high-frequency signal as a signal for reducing the lateral angular acceleration on the driving voltage of the wiper motor 18 so as to reduce the lateral angular velocity. It has become.

  That is, the inverted sound reduction control unit 72 superimposes a predetermined high frequency signal on the voltage calculated by the PI control unit 64. By applying the driving voltage on which the high frequency signal is superimposed to the wiper motor 18, the lateral acceleration when the wiper blades 28 and 30 are reversed and the wiping surface of the lip 74 is reversed to the opposite side is offset by the high frequency signal. Directional acceleration is reduced. As a result, the force with which the shoulder 80 and the restricting portion 78 of the wiper blades 28 and 30 are struck is reduced, the force of hitting the glass is reduced, and the reverse sound is also reduced.

  As the frequency of the high-frequency signal, a frequency obtained by an experiment or the like for measuring the inverted sound of the wipers 14 and 16 while changing the frequency is applied. Further, the superposition timing of the high-frequency signal is applied at least before the wiper blades 28 and 30 are reversed and the wiping surface of the lip is reversed to the opposite side. As described above, a reverse sound is generated when the wiping surface of the lip 74 is reversed to the opposite side and the shoulder 80 and the restricting portion 78 strike each other. Therefore, it is necessary to superimpose a high-frequency signal until the wiper blades 28 and 30 are inverted to raise the lip 74 and the neck 76 is not bent (immediately before the wiping surface of the lip 74 is inverted to the opposite surface). . For example, superposition of the high-frequency signal is started at the timing when the reversal of the wiper wiping operation is started (the rotational speed of the wiper motor 18 is 0 or the rotational direction is reversed). Alternatively, in order to allow a mechanical error or the like, the high-frequency signal is superimposed before a predetermined time before the timing of starting the reversal of the wiper wiping operation (the timing at which the rotation speed of the wiper motor 18 is 0 or the rotation direction is reversed). May start. The stop timing of the high-frequency signal may be stopped after a predetermined time after the wiper wiping operation is reversed, for example. Alternatively, the operation may be stopped when the wiper wiping operation is reversed and a predetermined motor angle is detected.

  Next, a specific example of the effect of reducing the lateral acceleration when a high frequency signal is input by the inverted sound reduction control unit 72 will be described. FIG. 5A shows the motor angle near the reversal position, FIG. 5B shows the lateral acceleration, and FIG. 5C shows an example of the high frequency signal (100 HZ).

  FIG. 5C shows an example in which the reverse sound reduction control unit 72 superimposes the high frequency signal at a timing before the rotation direction of the wiper motor 18 is reversed.

  When the inverted sound reduction control unit 72 does not superimpose a high-frequency signal, when the glass contact surface is reversed from the state in which the lip 74 is raised to the opposite surface, the dotted line in FIG. In addition, the lateral acceleration has a peak value. At this time, as described above, when the glass is struck by the wiper blades 28 and 30, the reversal sound is generated.

  On the other hand, when the high-frequency signal (100 Hz as an example) shown in FIG. 5C is superimposed at the timing before the rotation direction of the wiper motor 18 is reversed, the lateral angular velocity is as shown by the solid line in FIG. become. That is, the peak value is reduced compared to the case where no high frequency signal is superimposed. Since the lateral acceleration is reduced, the force of hitting the glass is reduced, so that the reverse sound of the wiper wiping operation can be reduced.

  Subsequently, a specific processing example performed by the vehicle wiper control device 10 according to the present embodiment will be described. FIG. 6 is a flowchart illustrating an example of processing performed by the inverted sound reduction control unit 72 in the vehicle wiper control device 10 according to the present embodiment. 6 is started by executing a program stored in the memory 60 when a wiper operation instruction is issued by the wiper switch 50, for example.

  In step 100, the reverse sound reduction control unit 72 acquires the motor angle information detected by the rotation angle sensor 54 and proceeds to step 102.

  In step 102, the inverted sound reduction control unit 72 determines whether or not it is the timing to superimpose the high-frequency signal. For example, the determination is made as to whether or not the rotation angle of the wiper motor 18 has reached a predetermined rotation angle before reversing. Alternatively, the rotational speed is obtained from the rotational angle of the wiper motor 18 per unit time to determine whether or not the rotational speed has become zero. If the determination is negative, the process returns to step 100 and the above processing is repeated, and if the determination is affirmative, the routine proceeds to step 104.

  In step 104, the inverted sound reduction control unit 72 starts superimposing a predetermined high-frequency signal on the voltage calculated by the PI control unit 64, and proceeds to step 106. As a result, as described above, the lateral acceleration of the wiper blades 28 and 30 at the time of reversal is reduced, so that the reversal sound can be reduced.

  In step 106, the reverse sound reduction control unit 72 acquires the motor angle information detected by the rotation angle sensor 54 and proceeds to step 108.

  In step 108, the inverted sound reduction control unit 72 determines whether it is time to stop the high-frequency signal. In this determination, for example, it is determined whether or not the wiper blades 28 and 30 are inverted to have a predetermined angle. Alternatively, it is reversed whether a predetermined time has elapsed since the start of application of the high-frequency signal. If the determination is negative, the process returns to step 106 and the above process is repeated. If the determination is affirmative, the process returns to step 100 and the above process is repeated.

  Thus, by executing the process of the reversal sound reduction control unit 72, the lateral acceleration when the wiper blades 28 and 30 are reversed can be reduced. Further, by reducing the lateral acceleration when the wiper blades 28 and 30 are reversed, the reversing sound can be reduced while reducing the force of hitting the glass and maintaining the wiping performance.

  In the above-described embodiment, the example in which the high-frequency signal is superimposed before at least the wiper blades 28 and 30 are reversed and the wiping surface of the lip 74 is reversed to the opposite side is described, but the present invention is not limited to this. For example, the high frequency signal may be superimposed upon the start of the wiper operation, and at least when the wiper wiping operation is reversed and the wiping surface of the lip is reversed to the opposite side, the high frequency signal may be input.

  In the above embodiment, the vehicle wiper device 11 configured to forward and reverse the wiper motor 18 has been described as an example. However, the present invention is not limited to this, and the wiper motor 18 can be rotated in one direction to perform the wiper wiping operation. The form to be performed may be applied.

  In the above embodiment, the processing of FIG. 6 has been described as software processing performed by executing a program. However, the processing is not limited to this, and may be performed by hardware, or a combination of both. It is good also as processing.

  Although one embodiment has been described above, the present invention is not limited to the above, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Wiper control apparatus for vehicles, 11 ... Wiper apparatus for vehicles, 12 ... Windshield glass, 14, 16 ... Wiper, 18 ... Wiper motor, 28, 30 ... Wiper blade, 56 ... Drive circuit, 58 ... Microcomputer, 64 ... PI control unit, 72 ... Inverted sound reduction control unit

Claims (5)

A wiper motor for performing a wiper blade reciprocating wiper operation on the windshield glass of the vehicle;
A control unit for controlling the driving voltage of the wiper motor to perform the wiper wiping operation;
A superimposing unit that superimposes a signal having a predetermined frequency on the driving voltage in order to reduce the reversal sound of the wiper blade during the reversal of the wiper blade ;
Wiper control apparatus for vehicles provided with. The superposition unit, wiper control device according to claim 1, the wiper blade in each of the reciprocating of said wiper wiping operation starts the overlap of the last issue relaxin at the timing of starting the inversion.   3. The vehicle wiper control device according to claim 2, wherein the timing at which the wiper blade starts to reverse is a timing at which the speed of the wiper wiping operation becomes zero when the wiper blade is reversed in each reciprocation of the wiper wiping operation. The superimposed portion of the vehicle according to claim 1, the wiping surface of the wiper wiping operation abuts inverts the windshield glass of the wiper blade starts the overlap of the last issue relaxin at a timing before being reversed to the opposite side Wiper control device.   The vehicle wiper control program for functioning a computer as the said control part of the vehicle wiper control apparatus of any one of Claims 1-3, and the said superimposition part.