JP2018090129A - Wiper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a direct drive type wiper device that, when one wiper motor is failed, causes a wiper blade with the failed wiper motor to recede in a position where the wiper blade does not come into contact with the other wiper blade.SOLUTION: When a wiper motor 18 of a left wiper device 14 is failed, a wiper ECU 62B stops the wiper motor 18 and controls rotation of a wiper motor 20 so as to push a wiper blade 30 of the left wiper device 14 with a wiper blade 32 of a right wiper device 16 to cause the wiper blade 30 of the left wiper device 14 to recede in a lower inversion position P2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wiper device.

  Direct drive for operating the wiper blade 132 of the right wiper device 116 on the driver's seat side and the wiper blade 130 of the left wiper device 114 on the passenger seat side by independent and independent wiper motors 118 and 120 as shown in FIG. The system wiper device synchronizes the rotations of the wiper motor 118 and the wiper motor 120 by means of a synchronization communication 186.

  If the synchronization communication 186 is normally performed and the wiper motor 118 and the wiper motor 120 are operating normally, the wiper blade 132 on the driver's seat side and the wiper blade 130 on the passenger seat side are in contact with each other. First, the wiping operation is performed between the upper inversion position P1 and the lower inversion position P2 on the windshield glass 12.

  However, for example, as shown in FIG. 7A, when the wiper motor 118 of the left wiper device 114 fails, even if the synchronization communication 186 is normal, the wiper blade 132 and the wiper blade 130 contact each other. There is a risk.

  As shown in FIG. 7B, when the wiper motor 118 of the left wiper device 114 fails, the wiper motor 120 of the right wiper device 116 that is normal is stopped, so that the wiper blade 130 and the wiper blade 132 are disconnected. Prevent contact. However, if the rotation of the wiper motors 118 and 120 is stopped, the windshield glass 12 is not wiped out at all, which hinders the securing of the visibility during rainy weather.

  Patent Document 1 discloses an invention of a direct drive type wiper device that, when the wiping operation of one wiper blade is stopped by an obstacle, pushes one wiper blade with the other wiper blade to eliminate the obstacle. Yes.

Japanese Patent Laid-Open No. 11-301417

  However, the technique disclosed in Patent Document 1 assumes that when one wiper blade is stationary due to an obstacle, the other wiper blade pushes the obstacle to eliminate the obstacle, and the case where the wiper motor breaks down is assumed. There was a problem of not doing.

  The present invention has been made in view of the above, and provides a direct drive type wiper device that, when one wiper motor fails, retracts the wiper blade in which the wiper motor has failed to a position where it does not contact the other wiper blade. Objective.

  In order to solve the above problem, the wiper device according to claim 1 is configured to wipe the first wiper blade so that one of the plurality of wiping ranges in which a part of the windshield glass overlaps is wiped. A second motor that wipes the second wiper blade so that the other wiping range of the plurality of wiping ranges is wiped, and the first motor or the second motor. When it is determined that the abnormality is abnormal, the wiping operation of the wiper blade that is wiped by the motor that is determined to be abnormal is stopped, and the wiping range including the overlapping portion is wiped by the wiper blade that is wiped by the normal motor. Thus, the control part which controls rotation of the 1st motor and the 2nd motor is included.

  According to this wiper device, when one of the motors fails, the wiper blade that is driven by a motor that operates normally is pressed by the wiper blade, and the wiper blade is not in contact with the other wiper blade. It can be retracted to the reverse position.

  The wiper device according to a second aspect is the wiper device according to the first aspect, wherein the control unit determines whether the normal motor is normal when the first motor or the second motor is determined to be abnormal. Control to increase torque.

  According to this wiper device, it is possible to increase the torque of a motor that operates normally and move the wiper blade that is driven by the motor that operates abnormally to a reverse position.

  The wiper device according to claim 3 is the wiper device according to claim 1 or 2, wherein the first sensor detects the state of the first motor, and the second sensor detects the state of the second motor. The control unit determines abnormality based on the results of the first sensor and the second sensor.

  According to this wiper device, the state of the motor is determined by a sensor that detects abnormality of the motor.

  The wiper device according to claim 4 is the wiper device according to claim 3, wherein each of the first sensor and the second sensor detects a rotation angle of a motor output shaft as a motor state. The control unit determines that the rotation is abnormal when the rotation angle detected by the rotation angle sensor during the rotation control of the motor does not change.

  According to this wiper device, the abnormality of the motor can be detected based on the rotation angle of the output shaft of the first motor and the rotation angle of the output shaft of the second motor.

  The wiper device according to claim 5 is the wiper device according to claim 3, wherein each of the first sensor and the second sensor is a current sensor that detects a motor current as a motor state, and the control When the current detected by the current sensor during the rotation control of the motor is equal to or greater than the upper limit current value or equal to or less than the lower limit current value, the unit determines that an abnormality has occurred.

  According to this wiper device, it is possible to detect a motor abnormality based on the motor current of the first motor and the motor current of the second motor.

  The wiper device according to claim 6 is the wiper device according to claim 3, wherein each of the first sensor and the second sensor is a voltage sensor that detects a voltage supplied from a power source as a motor state. The control unit determines that the voltage is abnormal when the voltage detected by the voltage sensor during the rotation control of the motor is equal to or higher than the upper limit voltage value or lower than the lower limit voltage value.

  According to this wiper device, it is possible to detect a motor abnormality based on the voltage value supplied to the first motor and the voltage value supplied to the second motor.

  The wiper device according to claim 7 is the wiper device according to claim 3, wherein each of the first sensor and the second sensor is a temperature sensor that detects a temperature of a circuit of the motor as a state of the motor, The controller determines that the temperature is abnormal when the temperature detected by the temperature sensor during the rotation control of the motor is equal to or higher than the upper limit temperature.

  According to this wiper device, it is possible to detect a motor abnormality based on the circuit temperature.

  The wiper device according to an eighth aspect is the wiper device according to the third aspect, wherein each of the first sensor and the second sensor is a motor state between the first motor and the second motor. The state of the communication for synchronization is detected, and it is determined that there is an abnormality when the communication for synchronization is interrupted during the rotation control of the motor.

  According to this wiper device, a motor abnormality can be detected from the state of communication for synchronization between the first motor and the second motor.

  The wiper device according to claim 9 is the wiper device according to any one of claims 1 to 8, wherein the first wiper blade is provided on a driver seat side of the windshield glass, and a driver seat side A pillar is provided. Near the driver's seat side A-pillar and a first upper reversal position parallel to the lower end of the windshield glass, and the second wiper blade is on the passenger seat side. Reciprocally wipe between a second upper reversal position within the wiping range of the first wiper blade and a second lower reversal position parallel to the lower end of the windshield glass near the passenger seat, When the first motor is abnormal, the control unit stops the rotation of the first motor and rotates the second motor so that the first wiper blade is moved by the second wiper blade. Above When the operation of the second motor is abnormal, the rotation of the second motor is stopped and the first motor is rotated to move the second wiper blade to the first rotation position. The wiper device according to any one of claims 1 to 8, wherein the wiper blade is controlled to be pushed down to the second reverse position by one wiper blade.

  According to this wiper device, when the first motor provided on the driver's seat side fails, the second motor is rotated to retract the first wiper blade to the upper reversal position, and If the provided second motor fails, the first motor can be rotated to retract the second wiper blade to the lower inversion position.

It is the schematic which shows the structure of the wiper apparatus which concerns on embodiment of this invention. It is a block diagram which shows the outline of an example of a structure of the wiper control circuit of the right wiper apparatus which concerns on embodiment of this invention. (A) shows a case where the wiper motor of the left wiper device fails when the wiper blade of the left wiper device moves from the upper reversal position to the lower reversal position or the storage position prior to the wiper blade of the right wiper device. (B) is explanatory drawing which showed the case where the wiper blade of a left wiper apparatus is pushed and moved to a downward inversion position or a storage position with the wiper blade of a right wiper apparatus. (A) shows an example of an energization pattern to the coil of the wiper motor during normal operation, and (B) shows a wiper motor driving the other wiper blade when one wiper blade is pushed by the other wiper blade. It is the time chart which showed an example of the electricity supply pattern to a coil. It is the flowchart which showed an example of the handling process at the time of the immobilization of the wiper apparatus which concerns on embodiment of this invention. It is the block diagram which showed an example of the modification of the wiper apparatus which concerns on embodiment of this invention. (A) shows a case where the wiper motor of the left wiper device has failed, and (B) is an explanatory diagram showing a case where the wiper motor of the right wiper device is stopped to prevent contact between the wiper blades.

  FIG. 1 is a schematic diagram illustrating a configuration of a wiper device 10 according to the present embodiment. For example, the wiper device 10 includes a left wiper device 14 on the left (passenger seat side) of the lower portion of the windshield glass 12 of the vehicle and a right wiper device 16 on the right (driver's seat side) of the lower portion of the windshield glass 12 of the vehicle. It is a tandem wiper device with direct drive provided. The left and right in the present embodiment are the left and right as viewed from the passenger compartment. The wiper device 10 according to the present embodiment rotates the wiper arm 26 of the left wiper device 14 and the wiper arm 28 of the right wiper device 16 in the same direction. Therefore, the output shaft 36 of the left wiper device 14 and the output shaft 38 of the right wiper device 16 are each rotated in the same direction.

  The left wiper device 14 and the right wiper device 16 include wiper motors 18 and 20, speed reduction mechanisms 22 and 24, wiper arms 26 and 28, and wiper blades 30 and 32, respectively. The wiper motors 18 and 20 are provided on the lower left and lower right of the windshield glass 12, respectively.

  In the left wiper device 14 and the right wiper device 16, the forward and reverse rotations of the wiper motors 18 and 20 are respectively decelerated by the speed reduction mechanisms 22 and 24, and the output shafts 36 and 38 are respectively rotated by the forward and reverse rotations decelerated by the speed reduction mechanisms 22 and 24. Rotate. Further, the rotational forces of the forward and reverse rotations of the output shafts 36 and 38 act on the wiper arms 26 and 28, respectively, whereby the wiper arms 26 and 28 move from the storage position P3 to the lower inversion position P2, and the lower inversion position P2 and the upper inversion position It reciprocates between P1. By the operation of the wiper arms 26 and 28, the wiper blades 30 and 32 respectively provided at the tips of the wiper arms 26 and 28 wipe between the lower inversion position P2 and the upper inversion position P1 on the surface of the windshield glass 12. The speed reduction mechanisms 22 and 24 are constituted by, for example, worm gears, and reduce the rotations of the wiper motors 18 and 20 to rotation speeds suitable for wiping the surface of the windshield glass 12 by the wiper blades 30 and 32, respectively. To rotate the output shafts 36 and 38 respectively.

  As described above, the wiper motors 18 and 20 according to the present embodiment have the speed reduction mechanisms 22 and 24 each composed of a worm gear. Therefore, the rotation speed and rotation angle of the output shafts 36 and 38 are determined by the wiper motor 18. , 20 is not the same as the rotation speed and rotation angle of the main body. However, in the present embodiment, since the wiper motors 18 and 20 and the speed reduction mechanisms 22 and 24 are inseparably configured, the rotational speeds and rotation angles of the output shafts 36 and 38 are hereinafter referred to as the wiper motors 18 and 20, respectively. The rotation speed and rotation angle are considered. In the present embodiment, for example, by synchronizing the rotation direction of the output shaft 36 of the left wiper device 14 with the rotation direction of the output shaft 38 of the right wiper device 16, the output shaft 36 and the output shaft 38 are respectively in the same direction. It is rotating.

  Wiper control circuits 60 and 62 for controlling the rotation of the wiper motors 18 and 20 are connected to the wiper motors 18 and 20, respectively. The wiper control circuit 60 according to the present embodiment includes a drive circuit 60A and a wiper ECU 60B, and the wiper control circuit 62 includes a drive circuit 62A and a wiper ECU 62B.

  A rotation angle sensor 42 that detects the rotation speed and rotation angle of the output shaft 36 of the wiper motor 18 is connected to the wiper ECU 60B. A rotation angle sensor 44 that detects the rotation speed and rotation angle of the output shaft 38 of the wiper motor 20 is connected to the wiper ECU 62B. The wiper ECUs 60B and 62B calculate the positions of the wiper blades 30 and 32 on the windshield glass 12 based on the signals from the rotation angle sensors 42 and 44, respectively. The wiper ECUs 60B and 62B control the drive circuits 60A and 62A so that the rotation speeds of the output shafts 36 and 38 change according to the calculated positions. The rotation angle sensors 42 and 44 are provided in the speed reduction mechanisms 22 and 24 of the wiper motors 18 and 20, respectively, and convert the magnetic field (magnetic force) of the excitation coil or magnet that rotates in conjunction with the output shafts 36 and 38 into current. To detect. The rotational speed of the output shafts 36 and 38 is controlled by a speed map (not shown) that defines the rotational speeds of the output shafts 36 and 38 according to the positions of the wiper blades 30 and 32, which is stored in a memory or the like described later. ).

  The drive circuits 60A and 62A generate voltages (currents) for operating the wiper motors 18 and 20, respectively, by PWM (Pulse Width Modulation) control and supply them to the wiper motors 18 and 20, respectively. The drive circuits 60A and 62A include a circuit using a field effect transistor (MOSFET) as a switching element. The drive circuit 60A is a wiper ECU 60B, and the drive circuit 62A is a wiper ECU 62B. Is output.

  The wiper ECU 60B and the wiper ECU 62B synchronize the operations of the left wiper device 14 and the right wiper device 16 by, for example, linking with communication using a protocol such as LIN (Local Interconnect Network). A wiper switch 66 is connected to the wiper ECU 62 </ b> B of the wiper control circuit 62 via the vehicle control circuit 64.

  The wiper switch 66 is a switch for turning on or off the electric power supplied from the vehicle battery to the wiper motors 18 and 20. The wiper switch 66 includes a low speed operation mode selection position for operating the wiper blades 30 and 32 at a low speed, a high speed operation mode selection position for operating at a high speed, an intermittent operation mode selection position for intermittent operation at a constant period, and a stop mode selection position. Can be switched to. Further, a command signal for rotating the wiper motors 18 and 20 according to the selected position in each mode is output to the wiper ECU 62B via the vehicle control circuit 64. The command signal input to the wiper ECU 62B is also input to the wiper ECU 60B by communication using the protocol such as the LIN described above. In FIG. 1, for the sake of convenience, the right wiper device 16 is a master wiper and the left wiper device 14 is a slave wiper.

  When signals output from the wiper switch 66 according to the selected position of each mode are input to the wiper ECUs 60B and 62B, the wiper ECUs 60B and 62B perform control corresponding to the output signals from the wiper switch 66. Specifically, the wiper ECUs 60B and 62B calculate the rotational speeds of the output shafts 36 and 38 based on the command signal from the wiper switch 66 and the above-described speed map. Further, the wiper ECUs 60B and 62B control the drive circuits 60A and 62A so that the output shafts 36 and 38 rotate at the calculated rotational speed.

  FIG. 2 is a block diagram schematically illustrating an example of the configuration of the wiper control circuit 62 of the right wiper device 16 according to the present embodiment. The wiper motor 20 shown in FIG. 2 is a brushless DC motor as an example, but may be a brushed DC motor. The configuration of the wiper control circuit 60 of the left wiper device 14 is the same as that of the wiper control circuit 62 of the right wiper device 16, and thus detailed description thereof is omitted.

  The wiper control circuit 62 shown in FIG. 2 includes a drive circuit 62A that generates a voltage to be applied to the winding terminal of the wiper motor 20, and a wiper ECU 62B that controls on and off of the switching elements constituting the drive circuit 62A. It is out.

  The rotor 72 of the wiper motor 20 is composed of three S-pole and N-pole permanent magnets. The magnetic field of the rotor 72 is detected by the hall sensor 70. The Hall sensor 70 may detect a magnetic field of a sensor magnet provided separately from the rotor 72 corresponding to the polarity of the permanent magnet of the rotor 72. The hall sensor 70 detects the magnetic field of the rotor 72 or the sensor magnet as a magnetic field indicating the position of the rotor 72.

  The hall sensor 70 is a sensor for detecting the position of the rotor 72 by detecting a magnetic field formed by the rotor 72 or a sensor magnet. The hall sensor 70 includes three hall elements corresponding to U, V, and W phases. The Hall sensor 70 outputs a change in magnetic field generated by the rotation of the rotor 72 as a voltage change signal approximating a sine wave.

  The signal output from the hall sensor 70 is input to the wiper ECU 62B which is a control circuit. The wiper ECU 62B is an integrated circuit, and the power supplied from the battery 80 as a power source is controlled by the standby circuit 50.

  The analog waveform signal input from the hall sensor 70 to the wiper ECU 62B is input to the hall sensor edge detection unit 56 including a circuit for converting an analog signal such as a comparator into a digital signal in the wiper ECU 62B. The hall sensor edge detector 56 converts the input analog waveform into a digital waveform, and detects an edge portion from the digital waveform.

  The digital waveform and edge information are input to the motor position estimation unit 54, and the position of the rotor 72 is calculated. Information on the calculated position of the rotor 72 is input to the energization control unit 58.

  A signal for instructing the rotational speed of the wiper motor 20 (rotor 72) is input from the wiper switch 66 to the command value calculation unit 52 of the wiper ECU 62B. The command value calculation unit 52 extracts a command related to the rotation speed of the wiper motor 20 from the signal input from the wiper switch 66 and inputs the command to the energization control unit 58.

  The energization control unit 58 calculates the phase of the voltage that changes according to the position of the rotor 72 calculated by the motor position estimation unit 54, and based on the calculated phase and the rotation speed of the rotor 72 indicated by the wiper switch 66. To determine the drive duty value. The energization control unit 58 performs PWM control that generates a PWM signal that is a pulse signal corresponding to the drive duty value and outputs the PWM signal to the drive circuit 62A.

  The drive circuit 62A is configured by a three-phase (U phase, V phase, W phase) inverter. As shown in FIG. 2, the drive circuit 62A includes three N-channel field effect transistors (MOSFETs) 74U, 74V, and 74W (hereinafter referred to as “FETs 74U, 74V, and 74W”) each serving as an upper stage switching element. Three N-channel field effect transistors 76U, 76V, 76W (hereinafter referred to as “FETs 76U, 76V, 76W”) as lower-stage switching elements are provided. The FETs 74U, 74V, and 74W and the FETs 76U, 76V, and 76W are collectively referred to as “FET74” and “FET76” when they do not need to be distinguished from each other, and “U” when they need to be distinguished from each other. , “V”, “W” are attached with symbols.

  Among the FETs 74 and 76, the source of the FET 74U and the drain of the FET 76U are connected to the terminal of the coil 40U, the source of the FET 74V and the drain of the FET 76V are connected to the terminal of the coil 40V, the source of the FET 74W and the FET 76W. The drain is connected to the terminal of the coil 40W.

  The gates of the FET 74 and the FET 76 are connected to the energization control unit 58, and a PWM signal is input. The FET 74 and FET 76 are turned on when an H level PWM signal is input to the gate, and current flows from the drain to the source. Further, when an L level PWM signal is input to the gate, the transistor is turned off and no current flows from the drain to the source.

  Further, the wiper control circuit 62 of the present embodiment includes a battery 80, a noise prevention coil 82, smoothing capacitors 84A and 84B, and the like. The battery 80, the noise prevention coil 82, and the smoothing capacitors 84A and 84B constitute a substantially DC power source. Although not shown in FIG. 2, a voltage sensor that detects the voltage of the battery 80, a current sensor that detects a motor current that is the current of the coil 40 of the wiper motor 20, and a substrate on which the wiper control circuit 62 is mounted. A thermistor or the like for detecting the temperature is mounted.

  Hereinafter, an operation and effect of wiper device 10 concerning this embodiment is explained. FIG. 3 is an explanatory diagram showing an example of the operation of the wiper device 10 according to the present embodiment. FIG. 3A shows the wiper motor 18 when the wiper blade 30 of the left wiper device 14 moves from the upper reverse position P1 to the lower reverse position P2 or the storage position P3 prior to the wiper blade 32 of the right wiper device 16. Is the case of failure. When the wiper motor 18 fails, the wiping operation of the wiper blade 30 of the left wiper device 14 stops.

  FIG. 3B is an explanatory diagram showing a case where the wiper blade 30 of the left wiper device 14 is pushed and moved to the lower inversion position P2 or the storage position P3 by the wiper blade 32 of the right wiper device 16. In the present embodiment, after the wiper blade 30 of the left wiper device 14 in which the wiper motor 18 has failed is moved to the lower inversion position P2 or the storage position P3, the right wiper device 16 has the lower inversion position P2 and the upper inversion position P1. The reciprocating wiping operation is performed between the two. If the wiper blade 30 of the left wiper device 14 is stopped at the lower inversion position P2 or the retracted position P3, the wiper blade 30 of the left wiper device 14 contacts the wiper blade 32 of the right wiper device 16 that performs the reciprocating wiping operation. There is nothing. While the wiper motor 18 of the left wiper device 14 is stopped, the wiper ECU 62B of the right wiper device 16 rotates the output shaft 38 of the wiper motor 20 in the rotation direction 92 to wipe the driver seat side of the windshield glass 12. To do.

  Although not shown, when the wiper motor 20 of the right wiper device 16 fails, the wiper blade 30 of the left wiper device 14 pushes the wiper blade 32 of the right wiper device 16 and moves it to the upper inversion position P1. If the wiper blade 32 of the right wiper device 16 is stopped at the upper inversion position P1, the wiper blade 32 of the right wiper device 16 does not come into contact with the wiper blade 30 of the left wiper device 14 that performs the reciprocating wiping operation. While the wiper motor 20 of the right wiper device 16 is stopped, the wiper ECU 60B of the left wiper device 14 rotates the output shaft 38 of the wiper motor 18 and wipes the passenger seat side of the windshield glass 12. In order to push the wiper blade 32 of the right wiper device 16 to the upper reversal position P1 with the wiper blade 30 of the left wiper device 14, in the case of the wiper device 10 shown in FIG. It is desirable to increase the range of the rotation angle of the 18 output shafts 36. Specifically, the range of the rotation angle of the output shaft 36 until the wiper blade 30 of the left wiper device 14 reaches the upper inversion position P1 of the right wiper device 16 beyond the upper inversion position P1 of the left wiper device 14. Increase

  FIG. 4A is a time chart showing an example of energization patterns to the coils 40U, 40V, and 40W. Energizations 102U, 102V, and 102W and energizations 104U, 104V, and 104W indicated by rectangles in FIG. 4 indicate timings when the coils 40U, 40V, and 40W are energized. In FIG. 4, energizations 102U, 102V, and 102W and energizations 104U, 104V, and 104W are shown as rectangles for convenience. However, in actual energization, voltages modulated in a pulse shape by PWM are coils 40U, 40V, and 40W. To be applied. Note that the unit time in FIG. 4 (for example, between the time t0 and the time t1) is a time during which the rotor 72 rotates 60 degrees in electrical angle.

  From time t0 to time t1, the FET 74W and the FET 76V are turned on, and the coil 40W is energized from the coil 40V. From time t1 to time t2, the FET 74U and the FET 76V are turned on, and the coil 40U is energized from the coil 40V. From time t2 to time t3, the FET 74U and the FET 76W are turned on, and the coil 40U is energized from the coil 40W. From time t3 to time t4, the FET 74V and the FET 76W are turned on, and the coil 40V is energized from the coil 40W. From time t4 to time t5, the FET 74V and the FET 76U are turned on, and the coil 40V is energized to the coil 40U. From time t5 to time t6, the FET 74W and the FET 76U are turned on, and the coil 40W is energized to the coil 40U. From time t6 to time t7, the FET 74W and the FET 76V are turned on, and the coil 40W is energized to the coil 40V. From time t7 to time t8, the FET 74U and the FET 76V are turned on, and the coil 40U is energized from the coil 40V.

  FIG. 4B is a time chart showing an example of an energization pattern to the coils 40U, 40V, and 40W of the wiper motor that drives the other wiper blade when one wiper blade is pushed by the other wiper blade. In FIG. 4B, in addition to energization 102U, 102V, and 102W, overlap energization 106U, 106V, and 106W are performed, and in addition to energization 104U, 104V, and 104W, overlap energization 108U, 108V, and 108W are performed. .

  In general, in a brushless DC motor, the torque of the output shaft increases when the energization time for each phase of U, V, and W is extended. In the present embodiment, the overlap energization 106U, 106V, 106W, 108U, 108V, and 108W shown in FIG. 4B is performed to increase the torque of the wiper motor and push the wiper blade of the wiper device that has become stationary. I have to. The overlap energization time varies depending on the wiper motor specifications and the like, and is specifically determined through a simulation at the time of design or an experiment using an actual machine.

  FIG. 5 is a flowchart showing an example of the handling process at the time of immobilization of the wiper apparatus 10 according to the present embodiment. In the present embodiment, for convenience, the right wiper device 16 is the master side, and the left wiper device 14 is the slave side.

  In step 500, a wiping operation according to the command value output from the wiper switch 66 is performed. In step 502, it is determined whether or not the slave-side wiper device is stationary. Whether the immobility is determined is determined when the synchronization communication 86 is interrupted, when the voltage of the battery 80 is equal to or higher than the upper limit value or lower limit value, or when the current flowing through the coil 40 of the wiper motor 18 is equal to or higher than the upper limit value or lower limit value. Either when the temperature of the substrate of the wiper control circuit 60 exceeds a predetermined value or when the rotation angle of the output shaft 36 detected by the rotation angle sensor 42 does not change even though the wiper motor 18 is energized. If this is the case, it is determined that the wiper motor 18 is stationary.

  Alternatively, when the difference between the rotation point angle of the output shaft 36 of the wiper motor 18 detected by the rotation angle sensors 42 and 44 and the rotation angle of the output shaft 38 of the wiper motor 20 exceeds a predetermined value, the slave-side wiper motor 18 Determined to be immobile.

  In step 504, it is determined based on the rotation angle of the output shafts 36 and 38 detected by the rotation angle sensors 42 and 44 whether or not the CLOSE operation is performed in which the wiper blades 30 and 32 move from the upper reversal position P1 to the lower reversal position P2. . If the determination in step 504 is affirmative, the procedure proceeds to step 506. If the determination in step 504 is negative, the procedure is kept waiting until the CLOSE operation is started.

  In step 506, the overlap energization shown in FIG. 4B is performed to increase the torque of the wiper motor 20 on the master side. In step 508, it is determined from the rotation angle of the output shaft 36 detected by the rotation angle sensor 42 whether or not the slave-side wiper blade 30 has reached the lower reversal position P <b> 2 or the storage position P <b> 3 that is the slave-side retracted position. If the determination in step 508 is affirmative, the procedure proceeds to step 510. If the determination in step 508 is negative, the overlap energization in step 508 is continued.

  In step 510, the wiping operation on the master side is continued and the process returns.

  FIG. 6 is a configuration diagram showing an example of a modified example of the wiper device 10 according to the present embodiment. In the wiper device 100 shown in FIG. 6, a command from the vehicle control circuit 64 is input not only to the wiper ECU 62 </ b> B of the right wiper device 16 but also to the wiper ECU 60 </ b> B of the left wiper device 14.

  The wiper device 100 shown in FIG. 6 basically has no difference between the master side and the slave side like the wiper device 10 shown in FIG. When one wiper motor is stationary, the wiper device 100 moves the wiper blade, whose wiper motor is stationary, with the other wiper blade. In the wiper device 100, even when one of the left wiper device 14 and the right wiper device 16 fails, the other wiper blade can move the failed wiper blade to the retracted position.

  As described above, in the present embodiment, the wiper blade in which the wiper motor is stationary is pushed out to the retracted position by the other wiper blade. be able to.

DESCRIPTION OF SYMBOLS 10 ... Wiper apparatus, 12 ... Wind shield glass, 14 ... Left wiper apparatus, 16 ... Right wiper apparatus, 18, 20 ... Wiper motor, 22 ... Deceleration mechanism, 26, 28 ... Wiper arm, 30, 32 ... Wiper blade, 36, 38 ... Output shaft, 40U, 40V, 40W ... Coil, 42, 44 ... Rotation angle sensor, 50 ... Standby circuit, 52 ... Command value calculation unit, 54 ... Motor position estimation unit, 56 ... Hall sensor edge detection unit, 58 ... Energization Control unit, 60 ... wiper control circuit, 60A ... drive circuit, 60B ... wiper ECU, 62 ... wiper control circuit, 62A ... drive circuit, 62B ... wiper ECU, 64 ... vehicle control circuit, 66 ... wiper switch, 70 ... Hall sensor 72 ... rotor, 74U, 74V, 74W, 76U, 76V, 76W ... FET, 80 ... battery, 82 ... noise prevention Coil, 84A ... smoothing capacitor, 86 ... communication for synchronization, 92 ... rotating direction, 100 ... wiper device, 102U, 102V, 102W, 104U, 104V, 104W ... energization, 106U, 106V, 106W, 108U, 108V, 108W ... over Lap energization, 114: left wiper device, 116: right wiper device, 118, 120 ... wiper motor, 130, 132 ... wiper blade, 186 ... synchronization communication, P1 ... upper reverse position, P2 ... lower reverse position, P3 ... storage position , T0, t1, t2, t3, t4, t5, t6, t7, t8 ... time

Claims (9)

A first motor for wiping the first wiper blade so that one of the wiping ranges of the plurality of wiping ranges in which part of the windshield glass overlaps is wiped;
A second motor for wiping the second wiper blade so that the other wiping range of the plurality of wiping ranges is wiped;
When it is determined that the first motor or the second motor is abnormal, the wiper blade wiping operation performed by the motor determined to be abnormal is stopped and the wiper operated by a normal motor. A control unit for controlling rotation of the first motor and the second motor so as to wipe the wiping range including the overlapping portion by the blade;
Including wiper device.   The wiper device according to claim 1, wherein the control unit performs control to increase torque of the normal motor when the first motor or the second motor is determined to be abnormal.   A first sensor for detecting a state of the first motor, and a second sensor for detecting a state of the second motor, wherein the control unit is based on results of the first sensor and the second sensor. The wiper device according to claim 1, wherein an abnormality is determined.   Each of the first sensor and the second sensor is a rotation angle sensor that detects a rotation angle of the output shaft of the motor as a state of the motor, and the control unit is detected by the rotation angle sensor during the rotation control of the motor. The wiper device according to claim 3, wherein an abnormality is determined when the rotation angle does not change.   Each of the first sensor and the second sensor is a current sensor that detects a motor current as a motor state, and the controller detects that the current detected by the current sensor during the rotation control of the motor is an upper limit current value. The wiper device according to claim 3, wherein the wiper device is determined to be abnormal when the value is equal to or greater than the lower limit current value.   Each of the first sensor and the second sensor is a voltage sensor that detects a voltage supplied from a power supply as a motor state, and the control unit detects a voltage detected by the voltage sensor during rotation control of the motor. The wiper device according to claim 3, wherein an abnormality is determined when the upper limit voltage value is equal to or higher than the lower limit voltage value.   Each of the first sensor and the second sensor is a temperature sensor that detects a temperature of a motor circuit as a state of the motor, and the controller detects that the temperature detected by the temperature sensor during the rotation control of the motor is an upper limit. The wiper device according to claim 3, wherein an abnormality is determined when the temperature is higher than the temperature.   Each of the first sensor and the second sensor detects the state of communication for synchronization between the first motor and the second motor as the state of the motor, and performs communication for synchronization during rotation control of the motor. The wiper device according to claim 3, wherein the wiper device is determined to be abnormal when the power supply is interrupted. The first wiper blade is provided on the driver seat side of the windshield glass, and is parallel to the first upper reversal position parallel to the driver side A pillar and the lower end of the windshield glass near the driver side A pillar. Wiping back and forth between the first lower reversing position and
The second wiper blade is provided on the passenger seat side, and is a second lower inversion parallel to the second upper inversion position within the wiping range of the first wiper blade and the lower end of the windshield glass near the passenger seat. Wipe back and forth between positions,
When the first motor is abnormal, the control unit stops the rotation of the first motor and rotates the second motor to move the first wiper blade to the second wiper blade. And when the operation of the second motor is abnormal, the rotation of the second motor is stopped and the first motor is rotated to rotate the second wiper blade. The wiper device according to any one of claims 1 to 8, wherein control is performed to push down the first wiper blade to the second reverse position.