JP2018188071A - Wiper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper device that inhibits a wiper motor from falling into overload by lowering a frictional coefficient between a wiper blade and a windshield glass.SOLUTION: When a current flowing through a coil of a wiper motor 18 that is detected by a motor current detection circuit 84 is equal to or larger than an upper limit value, or when temperature of a substrate of a drive circuit 80 that is detected by a temperature detection circuit 86 becomes equal to or higher than a predetermined value, a control part 58 determines that the wiper motor 18 falls into overload, and controls a washer motor 64 to operate to jet washer fluid to a windshield glass 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wiper device.

  The wiper device that wipes the windshield glass of the vehicle has a friction between the wiper blade and the windshield glass in the dry state where the surface of the windshield glass is dry than in the wet state where moisture exists on the surface of the windshield glass. The coefficient is high.

  If the friction coefficient between the wiper blade and the windshield glass is high, not only will the load of the wiper motor that wipe the wiper blade be increased, but the friction coefficient will increase sharply when the windshield glass surface changes from wet to dry. Due to such a change, the behavior of the wiper blade during the wiping operation may be disturbed, and an overrun may occur from the reverse position.

  Patent Document 1 discloses an invention of a wiper device that prevents damage to a wiper motor by operating a circuit breaker built in the wiper motor when a large load is applied to the wiper blade and stopping the wiper motor.

  Patent Document 2 discloses a wiper control device that eliminates the overheat state of the wiper motor and the control circuit by gradually reducing the wiping speed of the wiper blade when the control circuit of the wiper motor and the wiper device is overheated. The invention is disclosed.

Japanese Patent Laid-Open No. 11-301417 JP 2008-238899 A

  However, since the inventions described in Patent Documents 1 and 2 stop the wiping operation of the wiper device or reduce the wiping speed against the user's intention, the user may feel uncomfortable with the operation of the wiper device. It was.

  The present invention has been made in view of the above, and an object of the present invention is to provide a wiper device that reduces the friction coefficient between the wiper blade and the windshield glass and prevents the wiper motor from being overloaded.

  In order to solve the above-mentioned problem, the wiper device according to claim 1 includes a wiper motor for wiping a wiper blade on a windshield glass, a washer motor for operating a washer for injecting a cleaning liquid onto the windshield glass, and the wiper motor. A load detection unit that detects the load of the wiper motor, and when the load of the wiper motor detected by the load detection unit is equal to or greater than a predetermined threshold, the washer motor is operated to spray the cleaning liquid onto the windshield glass And a control unit that performs control.

  According to this wiper device, the cleaning liquid is sprayed onto the windshield glass when the wiper motor is overloaded. As a result, the friction coefficient between the wiper blade and the windshield glass can be reduced to prevent the wiper motor from being overloaded.

  A wiper device according to a second aspect of the present invention is the wiper device according to the first aspect, wherein the load detection unit is a current sensor that detects a current flowing through a coil of the wiper motor as a load.

  According to this wiper device, the load of the wiper motor can be detected based on the motor current of the wiper motor.

  The wiper device according to a third aspect is the wiper device according to the first or second aspect, wherein the load detection unit is a temperature sensor that detects a temperature of a circuit of the wiper motor as a load.

  According to this wiper device, the load on the wiper motor can be detected based on the temperature of the circuit.

  The wiper device according to claim 4 is the wiper device according to any one of claims 1 to 3, wherein a position information acquisition unit that acquires position information of the vehicle and moisture detection that detects moisture on the surface of the windshield glass. The position of the vehicle indicated by the position information acquired by the position information acquisition unit when the load of the wiper motor becomes equal to or greater than the threshold during rotation control of the wiper motor. The washing liquid is sprayed onto the windshield glass by operating the washer motor in at least one of the case where the vehicle is not exposed to precipitation and the moisture detected by the moisture detector is equal to or less than a predetermined amount. To control.

  According to this wiper device, the cleaning liquid is sprayed onto the windshield glass when the vehicle is located in a place where precipitation does not occur during operation of the wiper device or when the moisture on the surface of the windshield glass is low. To do. As a result, the friction coefficient between the wiper blade and the windshield glass can be reduced and reduced to prevent the wiper motor from being overloaded.

  A wiper device according to a fifth aspect is the wiper device according to any one of the first to fourth aspects, further comprising a display unit for displaying information to a user, wherein the control unit has a load of the wiper motor equal to or greater than a threshold value. In addition, control is performed to display information recommending that the operation of the wiper device be stopped on the display unit.

  According to this wiper device, when the wiper motor is overloaded, the user can be notified of information that recommends stopping the wiper device.

  The wiper device according to claim 6 is the wiper device according to any one of claims 1 to 5, wherein a nozzle of a washer that injects the cleaning liquid is an upper inverted position of a tip end portion of a wiper arm that wipes the wiper blade. The control unit is provided on each of a side facing the upper reversing position and a side facing the upper reversing position when the wiper blade is wiping toward the upper reversing position. The cleaning liquid is ejected from the nozzle provided in the nozzle, and when the wiper blade is performing the wiping operation toward the lower inversion position, the cleaning liquid is ejected from the nozzle provided on the side facing the lower inversion position. Do.

  According to this wiper device, it becomes possible to immediately wipe off the sprayed cleaning liquid with the wiper blade by spraying the cleaning liquid from the spray nozzle provided at the tip of the wiper arm forward in the direction of travel of the wiper blade. It is possible to prevent the visibility of the user who drives the vehicle with the sprayed cleaning liquid from being damaged.

It is the schematic which shows the structure of the wiper apparatus which concerns on the 1st Embodiment of this invention. It is the block diagram which showed an example of the drive circuit in case a wiper motor is a motor with a brush. It is the block diagram which showed an example of the drive circuit in case a wiper motor is a brushless motor. It is the flowchart which showed an example of operation | movement of the wiper apparatus which concerns on the 1st Embodiment of this invention. It is the schematic which shows the structure of the wiper apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows an example of the washer pump which concerns on the 2nd Embodiment of this invention.

[First Embodiment]
FIG. 1 is a schematic diagram illustrating a configuration of a wiper device 10 according to the present embodiment. The wiper device 10 is for wiping the 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 control circuit 22. It has.

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

  In the wipers 14 and 16, the wiper blades 28 and 30 reciprocate on the windshield glass 12 as the wiper arms 24 and 26 operate, 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 reverse via a speed reduction mechanism 52 mainly composed of a worm gear. The link mechanism 20 includes a crank arm 34, a first link rod 36, and a pair of pivots. Lever 38, 40, a pair of pivot shafts 42, 44, and a second link rod 46 are provided.

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

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

  In the wiper device 10, 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, and the wiper arm 24, The wiper blades 28 and 30 reciprocate between the lower reversing position P2 and the upper reversing position P1 on the windshield glass 12 in accordance with the reciprocating operation 26. Although the value of θ1 can take various values depending on the configuration of the link mechanism of the wiper device, etc., in this embodiment, it is set to 140 ° as an example.

  In the wiper device 10 according to the present embodiment, as shown in FIG. 1, when the wiper blades 28 and 30 are positioned at the storage position P3, the crank arm 34 and the first link rod 36 are linear. It is configured to be made.

  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. The value of θ2 can take various values depending on the configuration of the link mechanism of the wiper device, etc., but in this embodiment, it is 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.

  A control circuit 22 for controlling the rotation of the wiper motor 18 is connected to the wiper motor 18. The control circuit 22 according to the present embodiment generates, for example, a rotation angle sensor 54 that detects the rotation speed and rotation angle of the output shaft 32 of the wiper motor 18 and a current for operating the wiper motor 18 by pulse width modulation (PWM). The drive circuit 80 supplies the wiper motor 18 to the wiper motor 18, and the drive circuit 82 generates current for operating the washer motor 64 described later by PWM and supplies the current to the washer motor 64. The drive circuit 80 has different configurations depending on whether the wiper motor 18 is a brushless motor or a brushed motor, as will be described later.

  Since the wiper motor 18 according to the present embodiment has the speed reduction mechanism 52 as described above, the rotation speed and rotation angle of the output shaft 32 are not the same as the rotation speed and rotation angle of the wiper motor 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 wiper motor 18. .

  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 control circuit 22 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. A control unit 58 that controls the drive circuit 80 is included. In addition, the control unit 58 controls the drive circuit 82 to cause the drive circuit 82 to generate a voltage for operating the washer motor 64.

  A wiper switch 50 is connected to the control unit 58 via an input circuit 56. The input circuit 56 is a circuit that converts a signal from the wiper switch 50 into a signal that can be processed by the control unit 58. The wiper switch 50 turns on or off the power supplied from the vehicle battery to the wiper motor 18 and the washer motor 64. It is a switch that turns off. The wiper switch 50 includes a low-speed operation mode selection position for operating the wiper blades 28 and 30 at a low speed, a high-speed operation mode selection position for operation at a high speed, an intermittent operation mode selection position for intermittent operation at a constant period, and a rain sensor 94 It is possible to switch to an AUTO (auto) operation mode selection position and a storage (stop) mode selection position that are activated when a water droplet is detected. In addition, a signal corresponding to the selected position in each mode is output to the control unit 58 via the input circuit 56.

  When a signal output from the wiper switch 50 according to the selected position of each mode is input to the control unit 58 via the input circuit 56, the control unit 58 is driven by control corresponding to the output signal from the wiper switch 50. The circuit 80 generates power to be supplied to the wiper motor 18.

  As an example, the wiper switch 50 is provided as an operating means such as a lever, and operates the wiper motor 18 and the washer motor 64 while the user continues the operation of pulling the lever or the like.

  The washer pump 66 is driven by the rotation of the washer motor 64, and the washer pump 66 pumps the washer fluid in the washer fluid tank 68 to the driver seat side hose 72A and the passenger seat side hose 72B. The driver seat side hose 72A is connected to a driver seat side nozzle 74A provided below the driver seat side of the windshield glass 12. Further, the passenger seat side hose 72B is connected to a passenger seat side nozzle 74B provided below the windshield glass 12 on the passenger seat side.

  The control unit 58 is connected to a host ECU (Electronic Control Unit) 90 that controls the engine of the vehicle. The host ECU 90 has a rain sensor 94 for detecting water droplets on the surface of the windshield glass 12 and a navigation device (hereinafter, “instrument / navigation”) capable of positioning the vehicle by an instrument panel and GPS (Global Positioning System). ) Including the information device 96 is connected.

  The rain sensor 94 includes, for example, an LED that is an infrared light emitting element, a photodiode that is a light receiving element, a lens that forms an optical path of infrared light, and a control circuit. The infrared rays radiated from the LED are totally reflected by the windshield glass 12. However, if water droplets are present on the surface of the windshield glass 12, some of the infrared rays pass through the waterdrops and are emitted to the outside. The amount of reflection decreases. As a result, the amount of light entering the photodiode that is the light receiving element is reduced. Based on such a decrease in the amount of light, water droplets on the surface of the windshield glass 12 are detected.

  The host ECU 90 inputs rain sensor information related to the presence or absence of water droplets on the surface of the windshield glass 12 detected by the rain sensor 94 to the control unit 58. The controller 58 controls the drive circuits 80 and 82 to generate power for operating the wiper motor 18 and the washer motor 64 based on the input rain sensor information. In addition, the host ECU 90 acquires vehicle position information from the navigation device that is the information device 96 and inputs the vehicle position information to the control unit 58. From the control unit 58, a user notification, which is a signal indicating the state of the wiper device 10, is transmitted to the host ECU 90, and the host ECU 90 displays the information indicated by the received user notification on the instrument panel / navigator, which is the information device 96.

  Further, the control unit 58 includes a power supply voltage monitoring circuit 62 that detects the voltage of the battery that is a power supply, a motor current detection circuit 84 that detects a current (motor current) flowing through the drive circuit 80 and the coil of the wiper motor 18, and a control circuit. A temperature detection circuit 86 for detecting the temperature of the 22 substrates is connected.

  The control unit 58 determines that the power supply voltage is abnormal when the power supply voltage detected by the power supply voltage monitoring circuit 62 is equal to or lower than a predetermined lower limit voltage value or higher than a predetermined upper limit voltage value, and the wiper motor 18 and the washer motor 64 Stop operation.

  The control unit 58 also loads the wiper motor 18 when the motor current detected by the motor current detection circuit 84 is greater than or equal to a predetermined upper limit current value or when the temperature detected by the temperature detection circuit 86 is greater than or equal to a predetermined upper limit temperature. Is greater than or equal to a predetermined threshold load (overload). The lower limit voltage value, upper limit voltage value, upper limit current value, and upper limit temperature are specifically determined according to the specifications of the wiper device 10 and the wiper motor 18.

  FIG. 2 is a block diagram showing an example of the drive circuit 80 when the wiper motor 18 is a motor with a brush. The drive circuit 80 generates a drive signal for operating the switching element of the voltage generation circuit 80B based on the input control signal and outputs the drive signal to the voltage generation circuit 80B, and a switching element based on the drive signal. And a voltage generation circuit 80B that generates electric power to be supplied to the wiper motor 18 by operation.

  As shown in FIG. 2, the voltage generation circuit 80B is an H bridge circuit using transistors T1, T2, T3, and T4 which are N-type FETs as switching elements. The drains of the transistors T1 and T2 are connected to the positive electrode of the battery, and the sources are connected to the drains of the transistors T3 and T4, respectively. The sources of the transistors T3 and T4 are grounded.

  The source of the transistor T1 and the drain of the transistor T3 are connected to one end of the winding of the wiper motor 18, and the source of the transistor T2 and the drain of the transistor T4 are connected to the other end of the winding of the wiper motor 18. .

  When an H level drive signal is input to the gates of the transistors T1 and T4, the transistors T1 and T4 are turned on, and the wiper motor 18 has a clock when the wiper blades 28 and 30 are viewed from the passenger compartment side, for example. A current for operating around flows. Further, when one of the transistor T1 and the transistor T4 is on-controlled, the other voltage is controlled on and off by PWM, whereby the voltage of the current can be modulated.

  Further, when an H level drive signal is input to the gates of the transistors T2 and T3, the transistors T2 and T3 are turned on, and the wiper motor 18 sees, for example, the wiper blades 28 and 30 from the passenger compartment side. Current flows to operate counterclockwise. Further, when one of the transistor T2 and the transistor T3 is on-controlled, the other voltage is controlled on and off by PWM, whereby the voltage of the current can be modulated.

  FIG. 3 is a block diagram showing an example of the drive circuit 80 when the wiper motor 18 is a brushless motor. The voltage generation circuit 80B includes a three-phase (U-phase, V-phase, W-phase) inverter.

  When the wiper motor 18 is a brushless motor, the rotation control of the wiper motor 18 generates a voltage approximate to a three-phase alternating current having a phase corresponding to the position of the magnetic pole of the permanent magnet of the rotating rotor 118, and the coils 116U and 116V of the stator 114 are generated. , 116 W is required. A rotating magnetic field that rotates the rotor 118 is generated in the coils 116U, 116V, and 116W to which the voltage is applied, and the rotor 118 rotates according to the rotating magnetic field.

  The position of the magnetic pole of the rotor 118 is determined by detecting a change in the magnetic field of the rotor 118 or a sensor magnet having a magnetic pole corresponding to the rotor 118 with a Hall sensor or the like (not shown) using a Hall element. The control unit 58 calculates.

  A signal for instructing the rotational speed of the wiper motor 18 (rotor 118) is input from the wiper switch 50 to the control unit 58 via the host ECU 90. The control unit 58 calculates the phase of the voltage applied to the coil of the wiper motor 18 based on the position of the magnetic pole of the rotor 118 and drives based on the calculated phase and the rotation speed of the rotor 118 indicated by the wiper switch 50. A control signal for controlling the circuit 80 is generated and output to the pre-driver 80A.

  The pre-driver 80A generates a drive signal for operating the switching element of the voltage generation circuit 80B based on the input control signal, and outputs the drive signal to the voltage generation circuit 80B.

  As shown in FIG. 3, the voltage generation circuit 80B includes three N-type field effect transistors (FETs) 111U, 111V, and 111W (hereinafter referred to as “FETs 111U, 111V, and 111W”), each serving as an upper switching element. Each includes three N-type field effect transistors 112U, 112V, and 112W (hereinafter referred to as “FETs 112U, 112V, and 112W”) as lower-stage switching elements. The FETs 111U, 111V, and 111W and the FETs 112U, 112V, and 112W are collectively referred to as “FET111” and “FET112” 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.

  Of the FETs 111 and 112, the source of the FET 111U and the drain of the FET 112U are connected to the terminal of the coil 116U, the source of the FET 111V and the drain of the FET 112V are connected to the terminal of the coil 116V, and the source of the FET 111W and the FET 112W The drain is connected to the terminal of the coil 116W.

  The gates of the FET 111 and the FET 112 are connected to the pre-driver 80A, and a drive signal is input. The FET 111 and the FET 112 are turned on when an H level drive signal is input to the gate, and current flows from the drain to the source. Further, when an L level drive signal is input to the gate, the transistor is turned off and no current flows from the drain to the source.

  Each of the FETs 111 and 112 of the voltage generation circuit 80B is changed according to the position of the magnetic pole of the rotor 118 by PWM for turning on and off according to the drive signal, and the rotor 118 is rotated at the rotation speed designated by the wiper switch 50. The voltage to be generated is generated.

  FIG. 4 is a flowchart showing an example of the operation of the wiper apparatus 10 according to the present embodiment. The process shown in FIG. 4 is started when the wiper switch 50 is operated to activate the wiper device 10. In step 400, the rain sensor information detected by the rain sensor 94 and the vehicle position information by the navigation device are acquired. To do.

  In step 402, it is determined from the motor current detected by the motor current detection circuit 84 and the substrate temperature of the control circuit 22 detected by the temperature detection circuit 86 whether or not the load of the wiper motor 18 has exceeded a predetermined threshold load. . If the wiper motor 18 has a high load at step 402, the procedure proceeds to step 404. If the wiper motor 18 is not at a high load in step 402, the wiper device 10 is operated as usual based on the operation of the wiper switch 50 in step 414, and the procedure returns to step 400.

  In step 404, it is determined whether or not the surface of the windshield glass 12 is in a dry state based on the rain sensor information and the position information. For example, when the rain sensor information does not detect water droplets (moisture) on the surface of the windshield glass 12, when the detected water droplets are less than a predetermined amount, or even when more than a predetermined amount of water droplets are detected, the position of the vehicle is in the tunnel or In the case where the vehicle is not subject to precipitation, such as a multilevel parking lot, an affirmative determination is made in step 404 and the procedure proceeds to step 406. If the determination in step 404 is negative, the wiper apparatus 10 is operated as usual based on the operation of the wiper switch 50 in step 414, and the procedure returns to step 400.

  In step 406, the washer motor 64 is operated to inject the washer liquid onto the surface of the windshield glass 12. Although the washer liquid may be continuously sprayed within a predetermined time, in this embodiment, as an example, the washer liquid is intermittently sprayed at a predetermined interval and at a predetermined number of times, so that the surface of the windshield glass 12 is Spread the washer fluid throughout. The predetermined time, the predetermined interval, and the predetermined number of times are specifically determined according to the specifications of the wiper device 10 and the like.

  In step 408, a user notification that recommends stopping the wiper device 10 is transmitted to the host ECU 90. Based on the acquired user notification, the host ECU 90 outputs a display or announcement that recommends stopping the wiper device 10 to the instrument panel that is the information device 96.

  In step 410, it is determined whether or not the operation of the wiper device 10 is continued depending on whether or not the user has switched the wiper switch 50 to the storage (stop) mode selection position within a specified time after the user notification in step 408. The specified time is specifically determined in consideration of the rating of the wiper motor 18 and the like. If the user does not switch the wiper switch 50 to the storage (stop) mode selection position within the specified time in step 410, an affirmative determination is made and the procedure returns to step 400. If the user switches the wiper switch 50 to the storage (stop) mode selection position within the specified time in step 410, a negative determination is made, and in step 412, the wiper device 10 is stopped and the process is terminated.

  As described above, in the present embodiment, the washer liquid is sprayed onto the surface of the windshield glass 12 when the wiper motor 18 is heavily loaded and the surface of the windshield glass 12 is in a dry state. As a result, the friction coefficient between the wiper blades 28 and 30 and the surface of the windshield glass 12 is reduced, and the load on the wiper motor 18 can be reduced.

  In the present embodiment, it is determined whether or not the surface of the windshield glass 12 is in a dry state based on the rain sensor information indicating the state of the surface of the windshield glass 12 detected by the rain sensor 94. The rain sensor 94 also detects a state where the amount of water is small, such as light rain or powder snow. In the present embodiment, when the water droplet (moisture) detected by the rain sensor 94 is equal to or less than a predetermined amount, the wiper motor 18 is prevented from being overloaded by ejecting the washer liquid.

  In the present embodiment, it is determined whether or not the surface of the windshield glass 12 is in a dry state using not only the rain sensor information but also the position information of the vehicle measured by GPS. By using the position information of the vehicle, it is possible to predict when the surface of the windshield glass 12 immediately becomes dry, such as when the vehicle enters a facility with a tunnel or a roof with the wiper device 10 activated. In such a case, the wiper motor 18 can be prevented from being overloaded by injecting the washer liquid.

  As described above, in this embodiment, whether or not the washer liquid can be injected is determined based on the detection result of the rain sensor 94 and the vehicle position information obtained by GPS positioning in addition to the load state of the wiper motor 18. However, if priority is given to reducing the load on the wiper motor 18, the washer liquid may be ejected when the load on the wiper motor 18 exceeds a predetermined threshold load.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. FIG. 5 is a schematic diagram showing the configuration of the wiper apparatus 100 according to the present embodiment. The present embodiment is different from the first embodiment in that the wiper arms 24 and 25 are provided with a washer liquid injection nozzle, but the other configurations are the same as those of the first embodiment. A detailed description of the configuration is omitted.

  In this embodiment, the washer pump 166 is driven by the rotation of the washer motor 164, and the washer pump 166 pressure-feeds the washer liquid in the washer liquid tank 68 to the open-time injection hose 172A or the close-time injection hose 172B. The open-time injection hose 172A is connected to open-time injection nozzles 174A provided near the tips of the wiper arms 24 and 26, respectively. Further, the closing injection hose 172B is connected to the closing injection nozzle 174B provided in the vicinity of the tips of the wiper arms 24 and 26, respectively.

  As shown in FIG. 5, the injecting nozzle 174A is in the direction in which the wiper blades 28, 30 operate in the open operation in which the wiper blades 28, 30 wipe from the lower inversion position P2 to the upper inversion position P1, that is, It is provided toward the upper inversion position P1. In the present embodiment, in the case of the open operation, the washer liquid is jetted from the open jet nozzle 174A in the open jet direction 176A.

  Further, as shown in FIG. 5, the closing injection nozzle 174 </ b> B is a direction in which the wiper blades 28, 30 operate in the closing operation in which the wiper blades 28, 30 wipe from the upper reverse position P <b> 1 to the lower reverse position P <b> 2. That is, it is provided toward the lower inversion position P2. In the present embodiment, in the case of the closing operation, the washer liquid is injected from the closing injection nozzle 174B in the closing injection direction 176B.

  The washer motor 164 reverses the rotation direction between the open operation and the close operation, and in order to inject the washer liquid from the open injection nozzle 174A in the open operation and from the close injection nozzle 174B in the close operation. The pump 166 is driven.

  FIG. 6 is a cross-sectional view showing an example of the washer pump 166 according to the present embodiment. The washer pump 166 according to the present embodiment is a kind of turbo pump provided with a turbine 166A driven by a washer motor 164. The turbine 166A is driven in the arrow OPEN direction for the open operation and in the arrow CLOSE direction for the close operation.

  By driving the turbine 166A, the washer liquid in the washer liquid tank 68 is sucked into the pump housing 166B from the suction port 166C. When the turbine 166A is driven in the direction of the arrow OPEN, the washer fluid in the pump housing 166B flows from the discharge outlet 166D at the time of opening to the discharge outlet 166E at the time of closing when the turbine 166A is driven in the direction of CLOSE. Discharged. The open discharge port 166D is connected to the open injection nozzle 174A via the open injection hose 172A, and the close discharge port 166E is connected to the close injection nozzle 174B via the close injection hose 172B. ing. Therefore, the washer liquid is injected from the open-time injection nozzle 174A when the turbine 166A is driven in the arrow OPEN direction, and from the close-time injection nozzle 174B when the turbine 166A is driven in the arrow CLOSE direction.

  As shown in FIG. 6, the washer pump 166 according to the present embodiment has a valve 166F made of an elastic body such as rubber or synthetic resin. The valve 166F bends with the pressure of the washer liquid pumped by the turbine 166A, and closes the washer liquid inlet 166G when opened or the washer liquid inlet 166H when closed.

  For example, when the turbine 166A is driven in the direction of the arrow OPEN, the pressure on the side of the washer liquid inlet 166G at the time of opening increases so that the valve 166F bends and closes the washer liquid inlet 166H at the time of closing. Further, when the turbine 166A is driven in the direction of the arrow CLOSE, the valve 166F is deflected due to an increase in the pressure on the closing washer liquid inlet 166H side, and the open washer liquid inlet 166G is closed. As a result, the washer liquid is selectively injected from the open-time injection nozzle 174A or the close-time injection nozzle 174B by rotating the turbine 166A in the forward or reverse direction.

  In order to drive the turbine 166A in the direction of the arrow OPEN, the output shaft of the washer motor 164 is rotated in a predetermined direction. The drive circuit 182 forms an H bridge circuit like the drive circuit 80 of FIG. If the drive circuit 182 is substantially the same as the drive circuit 80 of FIG. 2, for example, by turning on the transistor T1 and the transistor T4, the output shaft of the washer motor 164 can be rotated in a predetermined direction.

  In order to drive the turbine 166A in the arrow CLOSE direction, the output shaft of the washer motor 164 is rotated in the direction opposite to the predetermined direction. For example, by turning on the transistor T2 and the transistor T3 in FIG. 2, the output shaft of the washer motor 164 can be rotated in a direction opposite to a predetermined direction.

  Furthermore, the rotational speed of the output shaft of the washer motor 164 in a predetermined direction can be controlled by switching one of the transistors T1 and T4 by PWM. Further, by switching one of the transistors T2 and T3 by PWM, the rotational speed of the output shaft of the washer motor 164 in the direction opposite to the predetermined direction can be controlled.

  As described above, according to the wiper device 100 according to the present embodiment, by injecting the washer liquid to the front in the traveling direction of the wiper blades 28 and 30 from the injection nozzles provided on the wiper arms 24 and 26, respectively. It is possible to rapidly apply the washer liquid over a wide range of the surface of the windshield glass 12.

  Further, according to the wiper device 100 according to the present embodiment, the spraying is performed by spraying the washer liquid from the spray nozzles provided at the tip portions of the wiper arms 24 and 26 to the front of the wiper blades 28 and 30 in the traveling direction. The washed washer liquid can be immediately wiped off by the wiper blades 28 and 30, and the visibility of the user who drives the vehicle with the sprayed washer liquid can be prevented.

DESCRIPTION OF SYMBOLS 10 ... Wiper apparatus, 12 ... Windshield glass, 14, 16 ... Wiper, 18 ... Wiper motor, 20 ... Link mechanism, 22 ... Control circuit, 24, 26 ... Wiper arm, 28, 30 ... Wiper blade, 32 ... Output shaft, 34 ... Crank arm, 36 ... Link rod, 38, 40 ... Pivot lever, 42, 44 ... Pivot shaft, 46 ... Link rod, 50 ... Wiper switch, 52 ... Reduction mechanism, 54 ... Rotation angle sensor, 56 ... Input circuit, 58 ... Control unit 62 ... Power supply voltage monitoring circuit 64 ... Washer motor 66 ... Washer pump 68 ... Washer liquid tank 72A ... Driver side hose 72B ... Passenger side hose 74A ... Driver side nozzle 74B ... Passenger side nozzle, 80 ... drive circuit, 80A ... pre-driver, 80B ... voltage generation circuit, 82 ... drive circuit, 8 ... Motor current detection circuit, 86 ... Temperature detection circuit, 90 ... Upper ECU, 94 ... Rain sensor, 96 ... Information equipment, 100 ... Wiper device, 111U, 111V, 111W, 112U, 112V, 112W ... FET, 114 ... Stator, 116U, 116V, 116W ... Coil, 118 ... Rotor, 164 ... Washer motor, 166 ... Washer pump, 166A ... Turbine, 166B ... Pump housing, 166C ... Suction port, 166D ... Opening discharge port, 166E ... Closed discharge port, 166F ... Valve, 166G ... Opening washer fluid inlet, 166H ... Closed washer fluid inlet, 172A ... Opening injection hose, 172B ... Closed injection hose, 174A ... Opening injection nozzle, 174B ... Closed injection Nozzle, 176A Open time injection direction, 176B ... closed during injection direction, 182 ... driving circuit, .theta.1 ... rotation angle, P1 ... upper reversal position, P2 ... lower turning position, P3 ... storage position, T1, T2, T3, T4 ... transistor

Claims (6)

A wiper motor for wiping the wiper blade on the windshield glass;
A washer motor for operating a washer for injecting cleaning liquid onto the windshield glass;
A load detection unit for detecting a load of the wiper motor;
When the load of the wiper motor detected by the load detection unit is equal to or greater than a predetermined threshold value, a control unit that controls the washer motor to operate and spray the cleaning liquid onto the windshield glass;
Including wiper device.   The wiper device according to claim 1, wherein the load detection unit is a current sensor that detects a current flowing through a coil of the wiper motor as a load.   The wiper device according to claim 1, wherein the load detection unit is a temperature sensor that detects a temperature of a circuit of the wiper motor as a load. A position information acquisition unit for acquiring position information of the vehicle;
A moisture detector for detecting moisture on the windshield glass surface;
Including
When the load of the wiper motor becomes equal to or greater than the threshold value during rotation control of the wiper motor, the control unit does not cause the vehicle to have a position of the vehicle indicated by the position information acquired by the position information acquisition unit. A control is performed to operate the washer motor to spray the cleaning liquid onto the windshield glass in at least one of the case where the water is detected and the water detected by the water detection unit is a predetermined amount or less. The wiper device according to any one of 1 to 3. A display unit for displaying information to the user;
5. The wiper device according to claim 1, wherein when the load of the wiper motor is equal to or greater than a threshold value, the control unit performs control to display information recommending that the wiper device stop operating on the display unit. .   The nozzles of the washer that sprays the cleaning liquid are respectively provided on the side facing the upper reversal position and the side facing the lower reversal position of the wiper arm that wipes the wiper blade, and the control unit includes the wiper When the blade is performing a wiping operation toward the upper reversal position, the cleaning liquid is sprayed from a nozzle provided on the side facing the upper reversal position, and the wiper blade is performing a wiping operation toward the lower reversal position. In this case, the wiper device according to any one of claims 1 to 5, wherein control is performed to eject a cleaning liquid from a nozzle provided on a side facing the lower inversion position.