JP6768261B2 - Control device, electric motor control method, wiper system and wiper system control method - Google Patents

Description

The present invention relates to a control technique for a vehicle wiper system mounted on an automobile or the like, and more particularly to an initial setting process when a wiper device is attached to a vehicle.

Vehicles such as automobiles are equipped with a wiper device that wipes off rain adhering to the windshield (windshield) and splashes from the vehicle in front in order to ensure the driver's visibility in rainy weather. The wiper device has a wiper arm that is swing-controlled by a wiper drive device, and a wiper blade that abuts on the windshield is attached to the tip of the arm. A pivot shaft that is rotationally driven by a wiper motor is provided on the body side of the vehicle, and the wiper arm is attached to the pivot shaft and swings at a preset control angle as the motor rotates.

Conventionally, when the wiper arm is attached to the pivot shaft, the arm position is set so that the wiper arm operates at a predetermined control angle, and the wiper arm is fixed to the pivot shaft. In this case, since the position of the wiper arm is set based on the theoretical value calculated in advance, the position of the wiper blade varies from vehicle to vehicle due to the influence of dimensional error, rigidity, etc. of the wiper arm and the wiper blade body. .. In particular, when the wiper arm / blade is attached, it is easily affected by the bending of the arm and the blade. Therefore, the wiper arm is set by using a predetermined jig. For example, in the conventional wiper mounting work, the arm is stopped at the lower retracted position, and while using a special jig, the wiper arm is tightened with a nut so that the tip of the wiper blade is within the specified range and mounted on the pivot shaft. ..

Japanese Unexamined Patent Publication No. 2008-18900

However, even if a jig is used, the wiper arm can be accurately within the specified range due to the shape of the arm, the sinking of the arm due to the axial force (force applied in the axial direction), the shape of the glass, the rigidity of the vehicle, and the variation of each part. It was quite difficult to put it on. Moreover, since the worker who performs this work is required to perform this work quickly, there is a problem that the worker is forced to bear a heavy burden. Further, in a so-called direct drive wiper in which a wiper arm is directly attached to an output shaft of a motor unit without a link mechanism, the pivot shaft is easily rotated when tightening a nut due to the mechanism. For this reason, there is a problem that the work of assembling the wiper arm blade within a predetermined angle range becomes more difficult. Further, the arm once mounted outside the specified range has a problem that it cannot be reused and is discarded because serration marks remain due to fitting with the pivot shaft.

An object of the present invention is to facilitate the mounting work of the wiper arm / blade, improve the accuracy of the mounting position, and reduce the waste loss.

The control device of the present invention includes an electric motor controlled by a PWM drive signal , rotationally drives a pivot shaft installed on a vehicle body by the electric motor, and uses a wiper arm fixed to the pivot shaft to drive the pivot shaft. provided a wiper blade attached to the wiper arm to a wiper system which Ru is operated by the wiping surface of the vehicle, a control device that performs operation control of the electric motor based on the duty value of the PWM driving signal, the The PWM drive is based on a blade speed detection unit that detects the moving speed of the wiper blade, a blade position detection unit that detects the current position of the wiper blade, the speed of the wiper blade, and the position information of the wiper blade. A drive control instruction unit that controls the electric motor by a signal, a memory that stores a learning correction program for executing a learning mode for correcting the position information of the wiper blade, and the wiper blade at a predetermined predetermined position. When it is confirmed by the blade position confirmation unit that detects the arrival and the blade position confirmation unit that the wiper blade has reached the specified position, the specified position detected by the blade position detection unit is described. It has a position information learning correction unit that learns as the current position of the wiper blade and corrects the position information, and a learning operation start unit that starts the learning correction program. When the learning mode is selected , the learning The operation start unit starts the execution of the learning correction program, and the drive control instruction unit rotates the electric motor toward the abutting member arranged at a predetermined predetermined position on the wiping surface. When the blade position confirmation unit determines based on the duty value of the PWM drive signal that the wiper blade has reached the specified position and the movement of the wiper blade has stopped, the blade position detection unit determines. detecting the position information of the wiper blade when the wiper blade by the blade position check unit is determined to have reached the predetermined position, the position information learning correction section, corresponding to the position information in said defined position It is characterized in that it is corrected to the specified value.

In the control device, the specified positions are (a) A pillar interference position, (b) upper inversion position, (c) blade interference upper limit position, (d) lower inversion position, (e) intermittent stop position, and (f). Either the lower storage position or (g) lower vehicle body contact position may be adopted.

The control method of the electric motor of the present invention, via a wiper arm fixed to the pivot shaft and the pivot shaft installed in the vehicle body, to operate the wiper blade attached to the wiper arm at the wiping surface, the wiper and the blade speed, the method of controlling an electric motor that will be controlled by the PWM driving signal based on a wiper blade position information, the learning correction program for correcting the position information by learning the position of the wiper blade When the learning mode based on is selected, the execution of the learning correction program is started, and the wiper blade is moved toward the contact member arranged at a predetermined predetermined position on the wiping surface by rotating the electric motor. It is operated, the stop of the wiper blade is detected based on the duty value of the PWM drive signal when the wiper blade reaches the specified position, the position of the wiper blade at that time is learned, and the position information is obtained. It is characterized in that it is corrected to a value corresponding to a specified position.

Further, the wiper system of the present invention is controlled by a wiper blade arranged on the wiping surface, a wiper arm to which the wiper blade is attached, a pivot shaft installed on the vehicle body and fixed to the wiper arm, and a PWM drive signal. A wiper system including an electric motor for rotationally driving the pivot shaft and a control device for controlling the operation of the electric motor, wherein the control device detects a blade speed for detecting the moving speed of the wiper blade. A drive control instruction that controls the electric motor by the PWM drive signal based on the unit, the blade position detecting unit that detects the current position of the wiper blade, the speed of the wiper blade, and the position information of the wiper blade. A position information learning correction unit that learns the position of the wiper blade detected by the blade position detection unit and corrects the position information, and a learning mode that learns the position of the wiper blade and corrects the position information. When the learning mode is selected, the control device shifts to the learning mode by the learning operation start unit, and the drive control instruction unit drives the electric motor. By rotating, the wiper blade is operated toward the contact member arranged at the predetermined position on the wiping surface, and the duty value of the PWM drive signal when the wiper blade reaches the specified position is set. Based on this, the stop determination of the wiper blade is performed, the position of the wiper blade at the time of the stop determination is detected by the blade position detection unit, and the position information is corrected to a value corresponding to the specified position by the position information learning correction unit. It is characterized by doing.

In the wiper system, the specified positions are (a) A pillar interference position, (b) upper inversion position, (c) blade interference upper limit position, (d) lower inversion position, (e) intermittent stop position, and (f). Either the lower storage position or the lower vehicle body contact position (g) may be adopted.

In addition, the control method of the wiper system of the present invention includes a wiper blade arranged on the wiping surface, a wiper arm to which the wiper blade is attached, a pivot shaft installed on the vehicle body and fixed to the wiper arm, and the pivot shaft. and a motor for rotationally driving the the speed of the wiper blade, wherein a control method of the wiper system that is controlled by the PWM driving signal based on the position information of the wiper blade, the position of the wiper blade When the learning mode based on the learning correction program that learns and corrects the position information is selected , the execution of the learning correction program is started, and the electric motor is rotated to reach a predetermined position on the wiper surface. The wiper blade is operated toward the abutting member to be arranged, the stop of the wiper blade is detected based on the duty value of the PWM drive signal when the wiper blade reaches the specified position, and the wiper blade at that time is described. It is characterized in that a learning mode is performed in which the position of the wiper blade is learned and the position information is corrected to a value corresponding to the specified position.

According to the present invention, since the learning mode for learning the position of the wiper blade and correcting the position information is performed, the position information of the wiper blade can be changed on the actually installed wiping surface. Therefore, it is possible to reduce the error of the position information due to the variation in the mounting position of the wiper blade, improve the control accuracy, and improve the wiping performance.

Further, since the position information of the wiper blade can be learned after the wiper arm is attached, the work accuracy at the time of attaching the blade is relaxed, the wiper arm and the blade can be easily set, and the work load on the operator is also reduced. Further, since the wiper arm blade is set easily and accurately, the reassembling work for the angle correction work becomes unnecessary, the disposal loss due to the improper installation is reduced, and the manufacturing cost can be reduced.

It is explanatory drawing which shows the whole structure of the wiper system which is one Embodiment of this invention. It is a block diagram which shows the structure of the control system of a wiper control device. It is explanatory drawing which shows the example of the defined position of the blade which is the basis of a learning process. It is a flowchart which shows an example of the procedure of a learning process.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing an overall configuration of a wiper system according to an embodiment of the present invention. The wiper system of FIG. 1 has an opposed wiping type device configuration, and is abbreviated as the wiper arm 1a on the driver's side (DR side) and the wiper arm 1b on the passenger's side (AS side) (hereinafter, arms 1a, 1b). Are arranged so that they face each other. Wiper blades 2a and 2b (hereinafter, abbreviated as blades 2a and 2b) are attached to the arms 1a and 1b, respectively. The blades 2a and 2b are in oppressive contact with the windshield (wiping surface) 3 by a spring member (not shown) incorporated in the arms 1a and 1b.

The vehicle body is provided with two wiper shafts (pivot shafts) 4a and 4b. The arms 1a and 1b are attached to the wiper shafts 4a and 4b at their base ends, respectively, and have a so-called direct drive wiper configuration. In addition, "a, b" in the code | symbol indicates that it is a member or part related to the driver's seat side and the passenger's seat side, respectively. In order to swing the arms 1a and 1b, the system is provided with two PWM duty controlled electric motors 6a and 6b (hereinafter, abbreviated as motors 6a and 6b). The motors 6a and 6b are composed of a motor body 7 and a speed reduction mechanism 8.

The motors 6a and 6b are driven and controlled by the wiper control devices (control means) 10a and 10b to rotate in the forward and reverse directions. The wiper control device 10a that drives and controls the motor 6a is connected to the ECU 11 that is a controller on the vehicle side via the vehicle-mounted LAN 12. From the ECU 11 to the wiper control device 10a, ON / OFF of the wiper switch, switch information such as Lo, Hi, INT (intermittent operation), engine start information, and the like are input via the LAN 12. The wiper control devices 10a and 10b are connected by a communication line 13.

In the wiper system of FIG. 1, the motors 6a and 6b are feedback controlled (PI controlled) based on the position information of the blades 2a and 2b. Here, the target speeds of both blades are set corresponding to the positions of the blades 2a and 2b, and are stored in the wiper control devices 10a and 10b in advance in the form of a map or the like. The wiper control devices 10a and 10b detect the current positions of the blades 2a and 2b, and also detect the moving speeds of the blades 2a and 2b from the rotation speeds of the wiper shafts 4a and 4b. The rotation speed of the wiper shafts 4a and 4b is detected by a sensor magnet attached to the rotation shafts of the wiper shafts 4a and 4b or the motors 6a and 6b and a magnetic sensor (both not shown) arranged opposite to the sensor magnet. .. Then, the current speeds of the blades 2a and 2b are compared with the target speeds of the blades 2a and 2b at the position, and the motors 6a and 6b are appropriately controlled according to the difference between the target speed and the current speed.

The control information of the motors 6a and 6b is exchanged between the wiper control devices 10a and 10b via the communication line 13, and the motors 6a and 6b are synchronously controlled based on the positional relationship of both blades. That is, the wiper control devices 10a and 10b first control the motors 6a and 6b in the forward and reverse directions based on the blade positions on their own side. At the same time, the wiper control devices 10a and 10b control the motors 6a and 6b based on the blade position information of both blades 2a and 2b, and control the wiper system so that the blades do not interfere with each other and the angle difference does not increase. .. As a result, the blades 2a and 2b swing between the downward reversal position and the upper reversal position within the wiping range 5, and rain, snow, etc. adhering to the windshield 3 are wiped.

Here, in the wiper system according to the present invention, after the arms 1a and 1b are attached to the wiper shafts 4a and 4b, the angles of the blades 2a and 2b (hereinafter referred to as blade angles) can be learned. That is, the wiper control devices 10a and 10b can be made to learn the blade angle, and the position information (angle data) for control can be corrected. Therefore, it is possible to absorb and calibrate the variation in the angle when the arm is attached, improve the control accuracy, relax the work accuracy, and reduce the work load on the operator.

In this case, in the learning of the blade angle, first, a predetermined blade position (for example, an upward inversion position) is set as a predetermined position, the blades 2a and 2b are moved to that position, and the blade is located there. To detect. The blade angle at the specified position is known in advance, and if it is possible to know that the blades 2a and 2b exist at the specified position, an accurate blade angle can be detected. Then, based on the detected data, the angle data relating to the other blade positions is corrected (learned).

Such learning processing is automatically performed by the wiper control devices 10a and 10b by executing the "learning mode" of the wiper system. A correction learning function (program) for this purpose is preset in the wiper control devices 10a and 10b. FIG. 2 is a block diagram showing a configuration of a control system in the wiper control device 10a. Since the wiper control devices 10a and 10b have the same configuration, only the wiper control device 10a will be described in FIG. 2 and the following description.

The wiper control device 10a is provided with a CPU 21 and a data transmission / reception unit 22. The wiper control device 10a is connected to the ECU 11 via the LAN 12. Various vehicle information such as a wiper switch setting state (ON / OFF, operation mode setting of Lo, Hi, INT, etc.), an engine start signal, and the like are input to the wiper control device 10a from the ECU 11. Further, in the wiper control device 10a, a ROM 23 in which various control programs including a correction learning function and various control information are stored, and a RAM 24 in which control data such as a motor rotation speed and a blade current position are stored are provided. Has been done.

The CPU 21 is a central processing unit, and here, the CPU 21 connected to the ECU 11 is on the master side, and the CPU of the wiper control device 10b (not shown) is on the slave side. The CPU 21 of the wiper control device 10a is connected to the CPU of the wiper control device 10b via the data transmission / reception unit 22 and the communication line 13. Both CPUs exchange blade position information and operation instructions with each other through the communication line 13. The CPU 21 on the master side controls the operation of the motor 6a based on the position information of the blade 2b sent from the wiper control device 10b and the position information of itself (blade 2a) according to the state of the wiper switch. The CPU on the slave side controls the operation of the motor 6b based on the position information of the blade 2a sent from the wiper control device 10a and the position information of itself (blade 2b) according to the instruction from the wiper control device 10a.

The CPU 21 has a blade position detection unit 25 that detects the current position of the blade 2a based on a sensor signal from a magnetic sensor provided in the motor 6a, and detects the current speed of the blade 2a based on the sensor signal. A blade speed detection unit 26 is provided. Further, the CPU 21 has a learning operation start unit 27 that starts the learning mode and automatically moves the blade 2a to a predetermined predetermined position when the "learning mode" is selected, and the blade 2a as the learning mode starts. A blade position confirmation unit 28 is provided to detect that the blade 2a reaches the specified position and is located there when the blade 2a moves to the specified position. In this case, the fact that the blade 2a has moved to the specified position is grasped by using an external specified position detecting means 31 or by changing the motor speed.

The CPU 21 is further provided with a position information learning correction unit 29 that corrects the position information regarding the blade 2a according to the specified position when the blade position confirmation unit 28 confirms that the blade 2a exists at the specified position. There is. In addition, the CPU 21 is provided with a drive control instruction unit 30 that operates the blade 2a in the predetermined position direction in the learning mode and appropriately operates the blade 2a between the upside down positions during the normal operation. During normal operation, the drive control instruction unit 30 instructs the motor 6a on the rotation direction, duty, and the like based on the blade position information, and controls the reciprocating operation of the blade 2a.

In the wiper system according to the present invention having such a configuration, after the arms 1a and 1b are attached to the wiper shafts 4a and 4b, the wiper control devices 10a and 10b are instructed to execute the "learning mode". As a result, the blades 2a and 2b are automatically operated, and the blade position information is learned and corrected. This learning process is performed while the wiper control devices 10a and 10b on the DR side and the AS side perform synchronous control with each other. At that time, as a defined position of the blade which is the basis of the learning process, as shown in FIG. 3, including the above-mentioned upper inversion position, (a) A pillar interference position, (b) upper inversion position, and (c) blade. 2a, 2b interference upper limit position, (d) downward inversion position, (e) intermittent stop position, (f) lower storage position, (g) expanded storage position (lower vehicle body contact position: below the storage position Positions that come into contact with the vehicle body and mechanically prevent blade movement) are used. In this case, the "specified position" may be set based on the positions of the arms 1a and 1b instead of the blades 2a and 2b. Although FIG. 3 shows each specified position with respect to the blade 2b, the specified position is similarly set on the blade 2a side.

On the other hand, as the specified position detecting means 31 for detecting that the blades 2a and 2b are located at these specified positions, for example, the following can be considered.
First, as a means for using a sensor, the following can be mentioned.
(1) A sensor is installed on the windshield 3 to detect the blade position (presence of the specified position).
(2) A sensor is installed on the body side.
(3) Install the sensor on the jig.
(4) Install a sensor on the arm or blade.
In this case, various sensors such as an optical type and a magnetic type can be applied as the sensor as long as it can detect that the blade is close to the specified position.

Next, as means using images, the following can be mentioned.
(5) The blade position is detected by image processing by photographing the glass surface with a camera.
(6) A camera is installed on the arm or blade, and the blade position is detected from the image.
In the cases of (1) to (6), in order to prevent the blades 2a and 2b from operating beyond the assumed operating range during the learning process, a stopper member for suppressing the operation is installed on the body side.

In addition, the following can be mentioned as means using the physical contact member. In this case, it is detected that the blades 2a and 2b are located at the specified positions by the blade speed becoming 0 when the blade hits the contact member without using the external specified position detecting means 31.
(7) Place the jig at the specified position and apply part or all of the arm or blade to the jig. The blades 2a and 2b are stopped at the specified positions with a jig, and the positions are fixed.
(8) The body (for example, A pillar: front window column) is used as a contact member, and a part or the whole of the arm or the blade is applied to the body to stop the blades 2a and 2b at the specified positions.
(9) The body-side reversing stopper (for example, the enlarged storage position, the stopper provided in the motor, the link mechanism, etc.) is used as the contact member, and a part or the whole of the arm or the blade is applied to the reversing stopper to hold the blades 2a and 2b. Stop at the specified position.

As described above, in the wiper system, a plurality of specified positions and a plurality of specified position detecting means are assumed, and a method in which they are appropriately combined (in the above cases, (a) to (g) and (1)). Depending on the combination of ~ (9), 7 × 9 = 63 methods can be considered) to execute the “learning mode”. Therefore, as an example, a case where (f) and (7) are combined, a jig is installed at the lower storage position, and the learning mode is executed will be described. FIG. 4 is a flowchart showing a procedure in which the arms 1a and 1b are attached to the wiper shafts 4a and 4b and the learning process is performed by the combination of (f)-(7).

As shown in FIG. 4, first, prior to the implementation of the learning mode, a jig for setting the wiper angle is installed at the lower storage position (step S1), and the arms 1a and 1b are attached to the wiper shafts 4a and 4b. (Step S2). After that, the process proceeds to step S3, and the wiper control devices 10a and 10b are instructed to execute the "learning mode" (step S3). This instruction is given by transmitting a command signal (learning mode = 1) to execute the learning mode from the external control device to the wiper control devices 10a and 10b. Upon receiving this, the wiper control devices 10a and 10b shift the wiper operation to the learning mode (learning mode = 1) by the learning operation start unit 27 (step S4).

The wiper control devices 10a and 10b that have shifted to the learning mode operate the blades 2a and 2b in the lower storage position direction by the drive control instruction unit 30 (step S5). As a result, the blades 2a and 2b move toward the lower storage position. When the blades 2a and 2b are moved toward the lower storage position, they come into contact with the jig installed in the lower storage position and the blades 2a and 2b stop (step S6). When the blades 2a and 2b stop, the blade speed detection unit 26 detects that the speed has become 0 (step S7), and the blade position confirmation unit 28 puts the blades 2a and 2b in the specified positions (lower storage positions). Detect that you have come. Although the blade stop determination is performed here based on the blade speed, it may be performed based on the motor duty, the operating time, or a combination thereof.

The blade position confirmation unit 28, which recognizes that the blades 2a and 2b are present at the specified positions, works on the position information learning correction unit 29 to correct the blade position information. That is, the angles of the blades 2a and 2b at that time are learned as the "lower storage position", and the angle data of the "lower storage position" in the blade position information is corrected (step S8). As a result, the blade position information is corrected to a value corresponding to the specified position (here, the lower storage position). The correction of the blade position information is performed based on the data of the lower storage position not only for the lower storage position but also for each angle position required for control such as the lower reverse position and the upper reverse position. At that time, the vehicle model data on which the wiper system is installed is also referred to, and the shape and curvature of the windshield, which are different for each vehicle model, are also applied. After the blade position information is corrected by the position information learning correction unit 29, the wiper control devices 10a and 10b terminate the "learning mode" (learning mode = 0: step S9) and exit the routine.

In the procedure of FIG. 4, the movement to the specified position accompanying the start of the learning mode is automatically performed by the learning correction program stored in the ROM 23, but these commands can also be issued from an external control device. (Dashed line path: step S11). In that case, the wiper control devices 10a and 10b are designated from the outside at a specified position, and the blades 2a and 2b are moved toward the specified position. By adopting such a control form, the specified position can be appropriately changed according to the vehicle type, process, etc., and the versatility of the system is expanded.

When the specified position is specified from the outside in this way, after correcting the blade position information, the blades 2a and 2b reach the specified position (lower storage position) with respect to the external control device, and the blade position information is corrected. A signal to that effect (lower storage position signal = 1) is transmitted (same as above: step S12). As a result, the lower storage position signal (specified position indicating signal) in the external control device is cleared (lower storage position signal = 0) (same: step S13). Upon receiving this, the external control device transmits a command signal (learning mode = 0) to end the learning mode to the wiper control devices 10a and 10b (same: step S14), and the wiper control devices 10a and 10b "learn". The "mode" is terminated (learning mode = 0: step S10).

As described above, in the wiper system of the present invention, after the arms 1a and 1b are assembled within a certain range, the "learning mode" is performed to move the blades 2a and 2b to the specified positions. Then, after recognizing that the blades 2a and 2b are located at the specified positions, the blade position information for control is corrected to the data corresponding to the specified positions. As a result, the blade position information can be changed on the glass surface actually installed, and the error of the blade position information due to the variation in the mounting positions of the blades 2a and 2b can be reduced, and the control accuracy can be improved. Further, it is possible to improve the setting accuracy of the wiping range and the interference avoidance accuracy against the interference between the blades in the opposed wiping type wiper device. Therefore, the wiping performance is improved, and the quality and added value of the system are also improved.

Further, since the blade angle is learned after the arm is mounted, high accuracy is not required for the initial blade mounting position, the wiper arm / blade can be easily set, and the work load on the operator is reduced. Moreover, since the learning process is automatically performed by setting the mode, the assembly workability can be improved in this respect as well. Further, since the wiper arm blade is set easily and accurately, the reassembling work for the angle correction work becomes unnecessary, the disposal loss due to the improper installation is reduced, and the manufacturing cost can be reduced. In addition, since the blade position information can be set after the vehicle is mounted, the wiper arm blade can be shared among a plurality of vehicle models.

It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof. For example, in the above-described embodiment, the two electric motors are arranged symmetrically with respect to the windshield 3, and the wiper device on the driver's side and the passenger's side is wiped so as to face each other. Although an example in which the present invention is applied is shown, it can also be applied to a tandem type wiper device that wipes the wiper arms on the driver's side and the passenger's side in substantially the same direction. Further, although the configuration of the direct drive wiper is shown as the configuration of the wiper, it can also be applied to the configuration of the wiper using the link mechanism.

Further, in the above-described embodiment, the seven locations (a) to (g) are illustrated as the specified positions, but other locations may be set as the specified positions. For example, the bonnet hood interference angle (the angle that interferes when the bonnet is opened with the wiper blade upright) is used, or the "learning mode check position" specially set for the learning process is set. It is also possible. That is, since the specified position may be any position that can be recognized as the specified position, it can be set arbitrarily. Further, although a combination of a sensor magnet and a magnetic sensor such as a Hall IC is shown as a means for detecting the rotation speeds of the wiper shafts 4a and 4b and the motors 6a and 6b, a rotary encoder or an MR sensor can also be used. ..

1a, 1b wiper arm 2a, 2b wiper blade 3 windshield 4a, 4b wiper shaft 5 wiping range 6a, 6b motor 7 motor body 8 reduction mechanism 10a, 10b wiper control device 11 ECU
12 In-vehicle LAN
13 Communication line 21 CPU
22 Data transmitter / receiver 23 ROM
24 RAM
25 Blade position detection unit 26 Blade speed detection unit 27 Learning operation start unit 28 Blade position confirmation unit 29 Position information learning correction unit 30 Drive control instruction unit 31 Specified position detection means

Claims (6)

A wiper blade provided with an electric motor controlled by a PWM drive signal, a pivot shaft installed on the vehicle body is rotationally driven by the electric motor, and is attached to the wiper arm via a wiper arm fixed to the pivot shaft. wherein provided on the wiper system Ru is operated at a vehicle of the wiping surface, and a control device that performs operation control of the electric motor based on the duty value of the PWM driving signal,
And the blade speed detecting unit for detecting a moving speed of said wiper blade,
A blade position detection unit that detects the current position of the wiper blade,
A drive control instruction unit that controls the electric motor by the PWM drive signal based on the speed of the wiper blade and the position information of the wiper blade.
A memory that stores a learning correction program for executing a learning mode that corrects the position information of the wiper blade, and
A blade position confirmation unit that detects that the wiper blade has reached a predetermined predetermined position, and
By the blade position check unit, when said wiper blade has reached the specified position has been confirmed, learns the prescribed position detected by the blade position detecting unit as the current position of the wiper blade, the position information Position information learning correction unit to correct
It has a learning operation start unit that starts the learning correction program, and
When the learning mode is selected ,
The learning operation start unit starts execution of the learning correction program,
The drive control instruction unit rotates the electric motor to operate the wiper blade toward a contact member arranged at a predetermined position on the wiping surface.
When the blade position confirmation unit determines that the wiper blade has reached the specified position and the movement of the wiper blade has stopped based on the duty value of the PWM drive signal, the blade position detection unit confirms the blade position. parts by detecting the position information of the wiper blade when the wiper blade is determined to have reached the predetermined position, the position information learning correction unit corrects the position information to a value corresponding to the prescribed position A control device characterized by The control device according to claim 1.
The specified positions are (a) A pillar interference position, (b) upper inversion position, (c) blade interference upper limit position, (d) lower inversion position, (e) intermittent stop position, and (f) lower storage position. (G) A control device characterized by being at any of the lower vehicle body contact positions. The wiper blade attached to the wiper arm is operated on the wiping surface via the pivot shaft installed on the vehicle body and the wiper arm fixed to the pivot shaft, and the speed of the wiper blade and the position information of the wiper blade are obtained. a method of controlling an electric motor that will be controlled by the PWM driving signal based on,
When the learning mode based on the learning correction program that learns the position of the wiper blade and corrects the position information is selected , the execution of the learning correction program is started and the electric motor is rotated to cover the wiping surface. The wiper blade is operated toward the contact member arranged at the predetermined position, and the stop of the wiper blade is detected based on the duty value of the PWM drive signal when the wiper blade reaches the specified position. A method for controlling an electric motor, which comprises learning the position of the wiper blade at that time and correcting the position information to a value corresponding to the specified position. The wiper blade placed on the wiping surface and
The wiper arm to which the wiper blade is attached and
A pivot shaft installed on the vehicle body and fixed to the wiper arm,
An electric motor that is controlled by a PWM drive signal and rotationally drives the pivot shaft,
A wiper system including a control device for controlling the operation of the electric motor.
The control device is
A blade speed detection unit that detects the moving speed of the wiper blade,
A blade position detection unit that detects the current position of the wiper blade,
A drive control instruction unit that controls the electric motor by the PWM drive signal based on the speed of the wiper blade and the position information of the wiper blade.
A position information learning correction unit that learns the position of the wiper blade detected by the blade position detection unit and corrects the position information,
It has a learning operation start unit that learns the position of the wiper blade and starts a learning mode that corrects the position information.
When the learning mode is selected, the control device
The learning operation start unit shifts to the learning mode,
By rotating the electric motor by the drive control instruction unit, the wiper blade is operated toward a contact member arranged at a predetermined predetermined position on the wiping surface.
The stop determination of the wiper blade is performed based on the duty value of the PWM drive signal when the wiper blade reaches the specified position.
A wiper system characterized in that the position of the wiper blade at the time of the stop determination is detected by the blade position detecting unit, and the position information is corrected to a value corresponding to the specified position by the position information learning correction unit. The wiper system according to claim 4.
The specified positions are (a) A pillar interference position, (b) upper reversal position, (c) blade interference upper limit position, (d) lower reversal position, (e) intermittent stop position, and (f) lower storage position. (G) A wiper system characterized in that it is at any of the lower vehicle body contact positions. The wiper blade placed on the wiping surface and
The wiper arm to which the wiper blade is attached and
A pivot shaft installed on the vehicle body and fixed to the wiper arm,
A method for controlling a wiper system , which comprises an electric motor for rotationally driving the pivot shaft, and is controlled by a PWM drive signal based on the speed of the wiper blade and the position information of the wiper blade .
When the learning mode based on the learning correction program that learns the position of the wiper blade and corrects the position information is selected , the execution of the learning correction program is started and the electric motor is rotated to cover the wiper surface. The wiper blade is operated toward the contact member arranged at the predetermined position, and the stop of the wiper blade is detected based on the duty value of the PWM drive signal when the wiper blade reaches the specified position. A method for controlling the wiper system, which is characterized by learning the position of the wiper blade at that time and performing a learning mode for correcting the position information to a value corresponding to the specified position.

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