JP6455114B2 - Wiper control device - Google Patents

Description

  The present invention relates to a wiper control device.

  When the windshield glass is wiped with the wiper blade, the wiped dirt is easily collected at the reversal position of the wiper blade. In particular, dirt swept from the windshield glass tends to accumulate between the upper reversal position on the driver's seat side and the A-pillar of the vehicle, which sometimes obstructs the driver's view.

  In the wiper control device described in Patent Document 1, a wiper device that detects the humidity on the windshield glass with a raindrop sensor and expands the wiping pattern if the windshield glass is relatively dry is disclosed.

Japanese Patent No. 4794107

  In general, as wiping with the wiper blade is continuously performed, dirt accumulates between the upper reversal position on the driver's seat side and the A pillar, and the humidity on the windshield glass decreases. Therefore, it may be possible to remove unwiped residues by enlarging the wiper blade wiping pattern as the humidity on the windshield glass decreases.

  However, when there is a lot of dirt on the surface of the windshield glass, dirt tends to accumulate between the upper reversal position on the driver's seat side and the A pillar even when the humidity on the windshield glass is high. In addition, when the washer device is operated to remove dirt on the windshield glass, the humidity on the windshield glass may remain high even when the washer device stops operating. As a result, the wiper device described in Patent Document 1 may not be able to effectively remove the dirt accumulated between the upper reversal position on the driver's seat side and the A pillar.

  The present invention has been made in view of the above, and an object of the present invention is to provide a wiper control device that can effectively remove dirt accumulated between the upper reversal position on the driver's seat side and the A pillar.

In order to solve the above-described problem, the wiper control device according to claim 1 includes a wiping control unit that performs a control to reciprocate the windshield and wipe the windshield when an operation signal is input, and a stop signal. Is input, the wiper blade is wiped from the upper reversing position above the upper reversing position to the enlarged upper reversing position and reversed at the enlarged upper reversing position, and then the wiper blade is stored in the retracted position. When the stop signal is input when the wiper blade is reciprocated by the wiping control unit in accordance with the washer liquid injection, the wiper blade is stopped at the lower reverse position for a predetermined time, and the enlargement is performed. after in wiping is operated wiper blade to the upper reversing position is reversed by reversing the position on the expansion, a storage control unit for controlling to store the wiper blade in the retracted position, the And Nde.

According to this wiper control device, after the stop signal for stopping the wiper blade is input, the wiper blade is reversed at the enlarged upper reversal position closer to the driver's seat side A pillar than the upper reversal position. As a result, the dirt accumulated between the upper reversal position on the driver's seat side and the A pillar can be effectively removed. Further, according to the wiper control device, it is possible to effectively remove the washer liquid and dirt that flowed out while the wiper blade is stopped for a predetermined time.

According to a second aspect of the present invention, in the wiper control device according to the first aspect, the storage control unit generates the stop signal when the wiper control unit is operating the wiper blade in the upward reverse position direction. When input, the wiper blade is wiped to the enlarged upper reversal position, and after the wiper blade is reversed at the enlarged upper reverse position, the wiper blade is stored in the retracted position. When the stop signal is input when the slidable lens is operated in the lower reversal position direction, the wiper blade is reversed at the lower reversal position, and the wiper blade is wiped up to the enlarged upper reversal position. Then, the wiper blade is controlled to be stored in the storage position.

According to this wiper control device, when a stop signal is input during an open operation in which the wiper blade is operated in the direction of the upper reversal position, after the wiper blade is wiped up to the enlarged upper reversal position and reversed, Store the wiper blade in the storage position. In addition, when a stop signal is input during the closing operation that moves the wiper blade toward the lower reversal position, the wiper blade is reversed at the lower reversal position, and the wiper blade is wiped up to the enlarged upper reversal position. Then, the wiper blade is stored in the storage position. By wiping the wiper blade to the enlarged upper reversal position, the dirt accumulated between the upper reversal position on the driver's seat side and the A pillar can be effectively removed.

A wiper control device according to a third aspect is the wiper control device according to the first or second aspect , wherein the storage control unit performs a wiping operation at a speed lower than a speed at which the storage control unit performs a wiping operation.

  According to this wiper control device, the operation speed of the wiper blade is reduced, and the wiper blade is reversed at the enlarged upward reversal position and stopped at the retracted position. It is possible to reliably remove dirt accumulated on the surface.

A wiper control device according to a fourth aspect of the present invention is the wiper control device according to any one of the first to third aspects, wherein the storage position is a lower inversion position or a position below the lower inversion position.

  According to this wiper control device, after the wiper blade is reversed at the enlarged upper reversal position, the wiper blade is retracted at the lower reversal position or the retracted position below the lower reversal position. By such an operation, it is possible to effectively remove the dirt accumulated between the upper reversal position on the driver's seat side and the A pillar when the wiper blade is stopped.

The wiper control device according to claim 5 is the wiper control device according to any one of claims 1 to 4 , wherein the stop signal is an on / off operation of the wiper blade and a switching of a reciprocating speed of the wiper blade. When the wiper switch that can be operated is turned off, it is input to the storage control section.

  According to this wiper control device, the dirt accumulated between the upper reversal position on the driver's seat side and the A pillar can be effectively removed by operating the wiper switch.

The wiper control device according to claim 6 further includes a raindrop sensor for detecting waterdrops on the windshield in the wiper control device according to claim 1 or 2 , wherein the raindrop sensor has a water droplet of a threshold value or more on the windshield. The operation signal is input to the wiping control unit when the water droplet is detected, and the stop signal is input to the storage control unit when the water droplet detected by the raindrop sensor on the windshield becomes less than the threshold value. .

  According to this wiper control device, when water drops on the windshield glass detected by the raindrop sensor become less than the threshold value, the dirt accumulated between the upper reversal position on the driver's seat side and the A pillar is effectively removed. it can.

According wiper control system in claim 7, wherein, in the wiper control apparatus of any one of claims 1-6, wherein the wiper blade, the upper windshield by a wiper motor for forward and reverse rotation at a range of a predetermined rotation angle When the wiping operation is performed and the stop signal is input, the storage controller rotates the wiper motor forward and backward at a rotation angle larger than the predetermined rotation angle, thereby reversing the wiper blade on the enlargement on the enlargement. Control to reverse at the position.

  According to this wiper control device, the dirt accumulated between the upper reversal position on the driver's seat side and the A pillar can be effectively removed by rotating the wiper motor forward and backward at a larger rotation angle than during normal operation.

It is the schematic which shows the structure of the wiper apparatus containing the wiper control apparatus which concerns on embodiment of this invention. It is a block diagram which shows the outline of an example of a structure of the wiper control apparatus which concerns on embodiment of this invention. It is the schematic which shows an example of the stop operation | movement of the wiper blade by the wiper control apparatus which concerns on embodiment of this invention. It is the schematic which shows another example of the stop operation | movement of the wiper blade by the wiper control apparatus which concerns on embodiment of this invention. It is the flowchart which showed an example of control of the wiper control device concerning an embodiment of the invention. It is the schematic which shows an example of the stop operation | movement of the wiper blade of the wiper control apparatus which concerns on embodiment of this invention at the time of a washer apparatus operating. It is the schematic which shows the modification of the stop operation | movement of the wiper blade of the wiper control apparatus which concerns on this Embodiment at the time of a washer apparatus operating.

  FIG. 1 is a schematic diagram showing a configuration of a wiper device 100 including a wiper control device 10 according to the present embodiment. The wiper device 100 is, for example, for wiping the windshield glass 12 provided in a vehicle such as a passenger car, and includes a pair of wipers 14 and 16, a wiper motor 18, a link mechanism 20, and a wiper control device 10. And.

  The wipers 14 and 16 are constituted by 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 in accordance with the operation of the wiper arms 24 and 26, and the wiper blades 28 and 30 wipe the windshield glass 12.

  The wiper motor 18 is a brushless DC motor including a stator that is an electromagnet that generates a rotating magnetic field by controlling an applied voltage in a circumferential direction of a rotor composed of permanent magnets. 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. The levers 38 and 40, a pair of pivot shafts 42 and 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 respectively.

  In the wiper device 100 including the wiper control device 10 according to the present embodiment, when the output shaft 32 is rotated forward and backward at a rotation angle θ1 within a predetermined range, the rotational force of the output shaft 32 is transmitted via the link mechanism 20. The wiper blades 28 and 30 are reciprocated between the lower reversing position P2 and the first upper reversing position P1 on the windshield glass 12 as the wiper arms 24 and 26 are reciprocated. . Although the value of θ1 can take various values depending on the configuration of the link mechanism of the wiper control device, etc., in this embodiment, it is 140 ° as an example.

  In the wiper device 100 including the wiper control 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 is a linear configuration.

  The storage position P3 is provided below the lower inversion position P2. The wiper blades 28 and 30 are moved to the storage 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. In the present embodiment, the wiper blades 28 and 30 are stopped at the storage position P3 below the lower inversion position P2, but may be stopped at the lower inversion position P2 by setting θ2 to 0 ° as described above.

  Further, in the wiper apparatus 100 including the wiper control apparatus 10 according to the present embodiment, the wiper blade 30 is disposed in order to wipe off dirt accumulated between the first upper reversal position P1 on the driver's seat side and the A pillar 94. The operation is performed from the first upper inversion position P1 to the second upper inversion position P0. In the present embodiment, by further rotating the output shaft 32 by θ3, the wiper blade 30 is operated from the first upper inversion position P1 to the second upper inversion position P0, and the enlarged wiping area 90 where dirt easily collects is wiped. In the present embodiment, by rotating the output shaft 32 by θ1 + θ3, a wider range including the enlarged wiping region 90 can be wiped than when the output shaft 32 is rotated by θ1.

  A wiper control device 10 for controlling the rotation of the wiper motor 18 is connected to the wiper motor 18. The wiper control device 10 according to the present embodiment includes, 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 PWM (Pulse Width Modulation) control of the current for operating the wiper motor 18. And a hall sensor 72 for detecting the position of the rotor of the wiper motor 18. A thermistor 102 for detecting the temperature of the substrate is mounted on the substrate of the wiper control device 10.

  In the present embodiment, since the wiper motor 18 is a brushless DC motor, the drive circuit 56 includes an inverter circuit using a MOSFET as a switching element, and generates a voltage with a predetermined duty ratio under the control of a microcomputer 58 described later.

  Since the wiper motor 18 according to the present embodiment has the speed reduction mechanism 52 as described above, the rotation speed and rotation angle of the output shaft 32 are not the same as the rotation speed and rotation angle of the wiper motor 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 a sensor magnet that rotates in conjunction with the output shaft 32 by converting it into a current.

  The wiper control device 10 can calculate the position of the wiper blades 28 and 30 on the windshield glass 12 from the rotation angle of the output shaft 32 detected by the rotation angle sensor 54, and the rotation speed of the output shaft 32 depends on the position. A microcomputer 58 that controls the drive circuit 56 so as to change is provided. The wiper control device 10 has a memory 48 that stores data and programs used for controlling the drive circuit 56, and a wiper switch 50 is connected to the microcomputer 58 of the wiper control device 10. The memory 48 is a non-volatile storage device such as an HDD (Hard Disk Drive) or a flash memory.

  The microcomputer 58 calculates the position of the rotor of the wiper motor 18 based on the signal output from the hall sensor 72. The microcomputer 58 controls the drive circuit 56 so as to generate a voltage having a phase based on the calculated rotor position.

  The wiper switch 50 is a switch for turning on or off the electric power supplied to the wiper motor 18 from a vehicle battery as a power source. The wiper switch 50 includes a Lo mode selection position at which the wiper blades 28 and 30 are operated at a low speed, a Hi mode selection position at which the wiper blades 28 and 30 are operated at high speed, an INT mode selection position at which the wiper blades 28 and 30 are intermittently operated at a fixed period, and a storage (stop) mode selection position. Can be switched to. In addition, a rotation speed command signal corresponding to the selected position in each mode is output to the microcomputer 58. Further, the wiper switch 50 incorporates a washer switch for turning on a washer device (not shown) for cleaning the windshield glass 12.

  When a signal output from the wiper switch 50 according to the selected position of each mode is input to the microcomputer 58, the microcomputer 58 performs control corresponding to the output signal from the wiper switch 50. Further, when the washer switch is turned on, the microcomputer 58 causes the washer liquid to be sprayed onto the windshield glass 12 while the washer switch is turned on, and the wiper blades 28 and 30 are operated.

  In the present embodiment, a raindrop sensor 92 that detects raindrops on the windshield glass 12 is provided. The raindrop sensor 92 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 infrared optical path, 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. In the present embodiment, the rain amount is calculated from the decrease amount of the received light amount of the infrared ray of the photodiode, and the wiper device is controlled to operate when the rain amount exceeds the threshold value.

  The raindrop sensor 92 may be mounted on the vehicle interior side of the windshield glass 12. However, in order to detect precipitation quickly, the rainshield sensor 92 may be mounted on the vehicle interior side of the windshield glass 12. It is preferable to provide in the upper part.

  FIG. 2 is a block diagram schematically illustrating an example of the configuration of the wiper control device 10 according to the present embodiment. The wiper motor 18 shown in FIG. 2 is a three-phase six-pole DC brushless motor as an example. The rotor 88 of the wiper motor 18 is composed of three S-pole and N-pole permanent magnets. The magnetic field of the rotor 88 is detected by the hall sensor 72. The hall sensor 72 may detect a magnetic field of a sensor magnet provided separately from the rotor 88 corresponding to the polarity of the permanent magnet of the rotor 88. The hall sensor 72 detects the magnetic field of the rotor 88 or the sensor magnet as a magnetic field indicating the position of the rotor 88.

  The signal output from the hall sensor 72 is input to the microcomputer 58 which is a control circuit. The microcomputer 58 is an integrated circuit, and the power supplied from the power supply 80 is controlled by the standby circuit 60.

  A signal input from the hall sensor 72 to the microcomputer 58 is a sinusoidal analog signal, but is converted into a rectangular wave digital signal by the hall sensor edge detection unit 66 in the microcomputer 58. The hall sensor edge detection unit 66 detects an edge where the digital signal changes from a high level to a low level or from a low level to a high level.

  The digital signal and edge information are input to the motor position estimation unit 64, and the position of the rotor 88 is calculated by the motor position estimation unit 64. Information on the calculated position of the rotor 88 is input to the energization control unit 68.

  A signal for instructing the rotational speed of the wiper motor 18 (rotor 88) is input from the wiper switch 50 to the command value calculation unit 62 of the microcomputer 58. The command value calculation unit 62 extracts a command related to the rotation speed of the wiper motor 18 from the signal input from the wiper switch 50 and inputs the command to the energization control unit 68.

  The command value calculation unit 62 receives a signal that the raindrop sensor 92 has detected a raindrop. The command value calculation unit 62 calculates the rainfall based on the signal input from the raindrop sensor 92, and gives a command for operating the wiper blades 28, 30 to the energization control unit 68 when the rain falls above a threshold value. input.

  A signal from the rotation angle sensor 54 is also input to the energization control unit 68. The energization control unit 68 calculates the position of the wiper blades 28 and 30 on the windshield glass 12 from the signal of the rotation angle sensor 54.

  The energization control unit 68 calculates the phase of the voltage that changes in accordance with the position of the rotor 88 and the position of the wiper blades 28 and 30 calculated by the motor position estimation unit 64, and is also instructed by the calculated phase and the wiper switch 50. The drive duty value is determined based on the rotation speed of the rotor 88. The energization control unit 68 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 56.

  The drive circuit 56 is configured by a three-phase (U-phase, V-phase, W-phase) inverter. As shown in FIG. 2, the drive circuit 56 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 switching element. Three N-channel field effect transistors (MOSFETs) 76U, 76V, and 76W (hereinafter referred to as “FETs 76U, 76V, and 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 there is no need to distinguish between the individual, and “U” when there is a need to distinguish between each. , “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 86U, the source of the FET 74V and the drain of the FET 76V are connected to the terminal of the coil 86V, and the source of the FET 74W and the FET 76W. The drain is connected to the terminal of the coil 86W.

  The gates of the FET 74 and FET 76 are connected to the energization control unit 68, and a PWM signal is input. The FET 74 and FET 76 are turned on when a high-level PWM signal is input to the gate, and current flows from the drain to the source. Further, when a low level PWM signal is input to the gate, the transistor is turned off, and no current flows from the drain to the source.

  In the present embodiment, the thermistor 102 is mounted near the drive circuit 56 constituted by FETs 74U, 74V, 74W, 76U, 76V, 76W which are switching elements. The thermistor 102 is an element whose resistance value changes with temperature, and forms a voltage dividing circuit together with the resistor 104. The voltage divided by the resistor 104 and the thermistor 102 is input to the energization control unit 68. The energization control unit 68 detects the temperature of the substrate on which the FETs 74U, 74V, 74W, 76U, 76V, and 76W are mounted based on the input voltage, and when the substrate temperature exceeds a predetermined threshold value. By reducing the rotational speed of the wiper motor 18, overheating of the substrate or the like is eliminated.

  Further, the wiper control device 10 of the present embodiment includes a power source 80, a noise prevention coil 82, smoothing capacitors 84A and 84B, and the like. The power source 80, the noise prevention coil 82, and the smoothing capacitors 84A and 84B constitute a substantially DC power source.

  FIG. 3 is a schematic diagram illustrating an example of the operation of stopping the wiper blades 28 and 30 by the wiper control device 10 according to the present embodiment. When the wiper switch 50 changes from the OFF position to the Lo mode selection position at the time T1 shown in FIG. 3, or when the rain detected by the raindrop sensor 92 exceeds the threshold value for operating the wiper blades 28 and 30 in the Lo mode. The command value calculation unit 62 receives “LO” as a switch signal (SW signal). The command value calculation unit 62 outputs a command for operating the wiper blades 28 and 30 in the Lo mode to the energization control unit 68, and the energization control unit 68 causes the wiper blades 28 and 30 to be operated based on the input command. PWM control for operating in the Lo mode is performed, and the wiper motor 18 is rotated.

  When the wiper switch 50 is turned off at the time T2 shown in FIG. 3 or when the rain detected by the raindrop sensor 92 is less than the threshold for operating the wiper blades 28 and 30, the command value is calculated. “OFF” is input to the unit 62 as a switch signal. The energization control unit 68 performs PWM control for rotating the wiper motor 18 so as to stop the wiper blades 28 and 30 at the storage position P3 based on the “OFF” signal input to the command value calculation unit 62.

  In FIG. 3, at time T2, the wiper blades 28 and 30 are in an open operation in which the wiper blades 28 and 30 operate from the lower inversion position P2 toward the first upper inversion position P1. The energization control unit 68 rotates the wiper motor 18 so that the wiper blades 28 and 30 are reversed not at the first upper reversal position P1 but at the second upper reversal position P0 after the time T2 when the “OFF” signal is input. PWM control is performed. The wiper motor 18 further rotates the output shaft 32 by θ3 shown in FIG. 1 to reverse the wiper blades 28 and 30 at the second upper reverse position P0.

  After the wiper blades 28 and 30 are reversed at the second upper reversal position P0, the wiper blades 28 and 30 are stopped at the storage position P3. Thus, after the switch signal “OFF” is input, the wiper blades 28 and 30 are reversed at the second upper reversal position P0 to wipe the enlarged wiping area 90 shown in FIG. After removing the accumulated dirt, the operation of the wiper blades 28 and 30 can be stopped.

  FIG. 4 is a schematic diagram illustrating another example of the operation of stopping the wiper blades 28 and 30 by the wiper control device 10 according to the present embodiment. When the wiper switch 50 changes from the OFF position to the Lo mode selection position at the time T1 shown in FIG. 4, or when the rain detected by the raindrop sensor 92 exceeds the threshold value for operating the wiper blades 28 and 30 in the Lo mode. The command value calculation unit 62 receives “LO” as a switch signal. The command value calculation unit 62 outputs a command for operating the wiper blades 28 and 30 in the Lo mode to the energization control unit 68, and the energization control unit 68 causes the wiper blades 28 and 30 to be operated based on the input command. PWM control for operating in the Lo mode is performed, and the wiper motor 18 is rotated.

  When the wiper switch 50 is turned OFF at the time T2 shown in FIG. 4 or when the rain detected by the raindrop sensor 92 is less than the threshold for operating the wiper blades 28 and 30, the command value is calculated. “OFF” is input to the unit 62 as a switch signal. The energization control unit 68 performs PWM control for rotating the wiper motor 18 so as to stop the wiper blades 28 and 30 at the storage position P3 based on the “OFF” signal input to the command value calculation unit 62.

  In FIG. 4, at time T2, the wiper blades 28 and 30 are in a closing operation in which the wiper blades 28 and 30 operate from the first upper inversion position P1 toward the lower inversion position P2. When the wiper blades 28 and 30 are in the closing operation at time T2 when the “OFF” signal is input, the energization control unit 68 operates the wiper blades 28 and 30 to the lower inversion position P2.

  When the wiper blades 28 and 30 reach the lower inversion position P2, the energization control unit 68 inverts the wiper blades 28 and 30 to move to the second upper inversion position P0, and also rotates the wiper blades 28 and 30 in the second upper inversion position. PWM control for rotating the wiper motor 18 is performed so as to be reversed at the position P0. The wiper motor 18 further rotates the output shaft 32 by θ3 shown in FIG. 1 to reverse the wiper blades 28 and 30 at the second upper reverse position P0.

  After the wiper blades 28 and 30 are reversed at the second upper reversal position P0, the wiper blades 28 and 30 are stopped at the storage position P3. As described above, in the operation from the lower inversion position P2 of the wiper blades 28 and 30 after the switch signal “OFF” is input, the wiper blades 28 and 30 are inverted at the second upper inversion position P0. The wiper blades 28 and 30 can be stopped after the enlarged wiping area 90 shown in FIG. 4 is wiped and the dirt accumulated in the area is removed.

  FIG. 5 is a flowchart showing an example of control of the wiper control device 10 according to the present embodiment. In step 700, “OFF” is input as a switch signal when the wiper switch 50 is turned OFF or the rain detected by the raindrop sensor 92 is less than the threshold value for operating the wiper blades 28 and 30. It is determined whether or not.

  If the determination in step 700 is affirmative, the position and rotation direction of the wiper blades 28 and 30 are calculated from the rotation angle of the output shaft 32 detected by the rotation angle sensor 54 in step 702, and the wiper blades 28 and 30 are inverted downward. It is determined whether or not the open operation is performed from the position P2.

  If the determination in step 702 is affirmative, in step 704, the rotational speed of the wiper motor 18 is set to Lo mode. When the operation mode of the wiper device is the Hi mode, the rotational speed of the wiper motor 18 is reduced, and when the operation mode is the INT mode, the rotational speed of the wiper motor 18 is increased. Then, the next inversion position of the wiper blades 28 and 30 is set to the second upper inversion position P0.

  If the determination in step 702 is negative, it is determined in step 706 whether or not the wiper blades 28 and 30 have reached the lower reverse position P2. If the determination is affirmative, the procedure proceeds to step 704.

  In step 708, it is determined whether the wiper blades 28, 30 have reached the second upper reversal position P0. If the determination is affirmative, the wiper blades 28, 30 are reversed in step 710.

  In step 712, it is determined whether or not the wiper blades 28 and 30 have reached the storage position P3. If the determination is affirmative, the rotation of the wiper motor 18 is stopped in step 714 to stop the operation of the wiper device 100. The process is terminated.

  FIG. 6 is a schematic diagram illustrating an example of a stop operation of the wiper blades 28 and 30 of the wiper control device 10 according to the present embodiment when the washer device is in operation. When the washer switch is turned on at time T <b> 1 shown in FIG. 6, “WASH” is input to the command value calculation unit 62 as a switch signal. The command value calculation unit 62 outputs a command for operating the wiper blades 28 and 30 at a speed suitable for wiping the sprayed washer liquid to the energization control unit 68, and the energization control unit 68 receives the input command PWM control based on the above is performed, and the wiper motor 18 is rotated.

  When the washer switch is turned off at time T <b> 2, “OFF” is input to the command value calculation unit 62 as a switch signal. The energization control unit 68 performs PWM control for rotating the wiper motor 18 so as to stop the wiper blades 28 and 30 at the storage position P3 based on the “OFF” signal input to the command value calculation unit 62.

  In FIG. 6, at time T2, the wiper blades 28 and 30 are in an open operation in which the wiper blades 28 and 30 move from the lower inversion position P2 toward the first upper inversion position P1, but unlike the case shown in FIG. Is reversed not at the second upper reversal position P0 but at the first upper reversal position P1 and stopped at the lower reversal position P2.

  In the case shown in FIG. 6, when the washer switch is turned off, the wiper blades 28 and 30 are temporarily turned over regardless of whether the wiper blades 28 and 30 are open or closed. After stopping at the position P2, a dripping prevention operation is performed to reciprocate from the lower inversion position P2 to wipe away the washer liquid remaining on the windshield glass 12.

  After the time T2 when the “OFF” signal is input, the energization control unit 68 moves the wiper blades 28 and 30 at a predetermined time tp from time T3 to time T4 when the wiper blades 28 and 30 reach the lower inversion position P2. Stop at the lower inversion position P2. While the wiper blades 28 and 30 are stopped at the predetermined time tp, the sprayed washer liquid may flow from the top of the roof or the windshield glass 12 in some cases. From time T4, the operation of the wiper blades 28 and 30 stopped at the lower inversion position P2 is started, and the wiper blades 28 and 30 are inverted at the second upper inversion position P0 instead of the first upper inversion position P1. In addition, PWM control for rotating the wiper motor 18 is performed.

  After the wiper blades 28 and 30 are reversed at the second upper reversal position P0, the wiper blades 28 and 30 are stopped at the storage position P3. In this way, in the operation from the lower inversion position P2 of the wiper blades 28, 30 after the washer switch is turned off, the wiper blades 28, 30 are inverted at the second upper inversion position P0, as shown in FIG. After the enlarged wiping area 90 is wiped and the dirt accumulated in the area is removed, the operation of the wiper blades 28 and 30 can be stopped.

  FIG. 6 shows the case where the washer device is operated, but when the “OFF” signal is input to the wiper control device by turning off the wiper switch 50 without operating the washer device. Alternatively, the wiper blades 28 and 30 may be stopped for a predetermined time tp at the lower inversion position P2. By reciprocating the wiper blades 28 and 30 by reversing them at the second upper reversal position P0 after stopping for a predetermined time tp, the water droplets and dirt flowing out on the windshield glass 12 during the predetermined time tp are wiped off. be able to.

  FIG. 7 is a schematic diagram showing a modified example of the stop operation of the wiper blades 28 and 30 of the wiper control device 10 according to the present embodiment when the washer device is activated. When the washer switch is turned on at time T <b> 1 shown in FIG. 7, “WASH” is input to the command value calculation unit 62 as a switch signal. The command value calculation unit 62 outputs a command for operating the wiper blades 28 and 30 at a speed suitable for wiping the sprayed washer liquid to the energization control unit 68, and the energization control unit 68 receives the input command PWM control based on the above is performed, and the wiper motor 18 is rotated.

  When the washer switch is turned off at time T 3, “OFF” is input to the command value calculation unit 62 as a switch signal. The energization control unit 68 performs PWM control for rotating the wiper motor 18 so as to stop the wiper blades 28 and 30 at the storage position P3 based on the “OFF” signal input to the command value calculation unit 62.

  In FIG. 7, at time T3, the wiper blades 28 and 30 are in an open operation in which the wiper blades 28 and 30 operate from the lower inversion position P2 toward the first upper inversion position P1. After the time T3 when the “OFF” signal is input, the energization control unit 68 rotates the wiper motor 18 so as to invert the wiper blades 28 and 30 not at the first upper inversion position P1 but at the second upper inversion position P0. PWM control is performed.

  As shown in FIG. 7, the operation cycle t2 of the wiper blades 28 and 30 after the “OFF” signal is input is the operation cycle t1 of the wiper blades 28 and 30 when the washer switch is turned on. Longer than. By making the operation cycle t2 of the wiper blades 28, 30 longer than the cycle t1, the washer switch is turned on to determine the speed at which the wiper blades 28, 30 reciprocate after the “OFF” signal is input. It is slower than the case.

  In the example shown in FIG. 7, the wiper blades 28 and 30 are operated at the period t1 until the time T3. However, when the “OFF” signal is input at the time T3, the wiper blades 28 and 30 are operated at the operation speed according to the period t2. 30 is operated. Therefore, at time T3, the operation speed of the wiper blades 28 and 30 may change discontinuously. In the period t2 shown in FIG. 7, the wiper blades 28 and 30 are moved from the lower inversion position P2 to the second upper inversion position P0 and inverted at the second upper inversion position P0, and then are operated to the storage position P3. Assumes that Therefore, as shown in FIG. 7, when the “OFF” signal is input during the open operation in which the wiper blades 28 and 30 operate from the lower inversion position P2, strictly speaking, the period from the time T2 to the time T4. Becomes shorter than the period t2. However, there is no practical problem if the wiper blades 28 and 30 are decelerated after the time T3 and operated to the second upper inversion position P0.

  Due to such deceleration, the wiper blades 28 and 30 are surely wiped on the windshield glass 12 to remove the dirt accumulated in the enlarged wiping area 90 shown in FIG. 1 and the dripping generated on the windshield glass 12 is removed. Eliminate.

  When the wiper blades 28 and 30 are moving from the first upper reversal position P1 toward the lower reversal position P2 at the time T3, the wiper blades 28 and 30 are moved to the lower reversal position P2 while maintaining the period t1. To work. Then, the wiper blades 28 and 30 are operated from the lower inversion position P2 at the cycle t2, and the wiper blades 28 and 30 are inverted at the second upper inversion position P0.

  After the wiper blades 28 and 30 are reversed at the second upper reversal position P0, the wiper blades 28 and 30 are stopped at the storage position P3.

  As described above, according to the present embodiment, when the operation of the wiper blades 28 and 30 is stopped, the windshield glass 12 includes a portion closer to the A pillar on the driver's seat side than the normal operation. The dirt accumulated between the upper reversal position on the driver's seat side and the A pillar can be effectively removed.

DESCRIPTION OF SYMBOLS 10 ... Wiper control apparatus, 12 ... Windshield glass, 14, 16 ... Wiper, 18 ... Wiper motor, 20 ... Link mechanism, 24, 26 ... Wiper arm, 28, 30 ... Wiper blade, 32 ... Output shaft, 34 ... Crank arm, 36 ... Link rod, 38, 40 ... Pivot lever, 40 ... Pivot lever, 42, 44 ... Pivot shaft, 46 ... Link rod, 48 ... Memory, 50 ... Wiper switch, 52 ... Reduction mechanism, 54 ... Rotation angle sensor, 56 DESCRIPTION OF SYMBOLS ... Drive circuit 58 ... Microcomputer 60 ... Standby circuit 62 ... Command value calculation part 64 ... Motor position estimation part 66 ... Hall sensor edge detection part 68 ... Current supply control part 72 ... Hall sensor 74U, 74V 74W, 76U, 76V, 76W ... FET, 80 ... power supply, 82 ... noise prevention coil, 84A 84B: smoothing capacitor, 86U, 86V, 86W ... coil, 88 ... rotor, 90 ... enlarged wiping area, 92 ... raindrop sensor, 94 ... A pillar, 100 ... wiper device, 102 ... thermistor, 104 ... resistance, [theta] 1, [theta] 2, θ3: rotation angle, P0: second upper inversion position, P1: first upper inversion position, P2: lower inversion position, P3: storage position, T1, T2, T3, T4 ... time, t1, t2 ... period, tp ... Predetermined time

Claims (7)

A wiping control unit that performs a control of wiping the windshield by reciprocating the wiper blade when an operation signal is input;
Control to store the wiper blade in the retracted position after the wiper blade is wiped up to the enlarged upper inversion position above the upper inversion position of the reciprocating operation when the stop signal is input and then reversed at the enlarged inversion position. When the wipe signal is reciprocated by the wiping control unit in accordance with the washer liquid jetting, when the stop signal is input, the wiper blade is stopped at a lower reverse position for a predetermined time, and A storage control unit that performs control to store the wiper blade in the storage position after the wiper blade is wiped up to the enlargement upper reversal position and reversed at the enlargement upper reversal position;
Including wiper control device. The storage control unit
If the stop signal is input when the wiper blade is operated in the direction of the upper reversal position by the wiping control unit, the wiper blade is wiped up to the enlarged upper reversal position and reversed at the enlarged upper reversal position. After that, control to store the wiper blade in the storage position,
If the stop signal is input when the wiper control unit is operating the wiper blade in the lower reverse position direction, the wiper blade is reversed at the lower reverse position and the wiper blade is wiped to the enlarged upper reverse position. after it is operated by inverting in reverse position on the enlargement, the wiper control apparatus according to claim 1, wherein for controlling to store the wiper blade in the retracted position. The wiper control device according to claim 1 or 2 , wherein the storage control unit performs a wiping operation at a speed lower than a speed at which the storage control unit performs a wiping operation. The storage position, the wiper control device according to any one of claims 1 to 3 which is the position of the lower side of the lower reversal position or lower reversing position. The stop signal, according to claim 1-4 in which the speed of the switching operation of the reciprocating operation of the on operation of the wiper blade and off as well as the wiper blade is capable wiper switch is input to the storage control unit when it is turned off The wiper control apparatus of any one of Claims. A raindrop sensor for detecting waterdrops on the windshield,
The operation signal is input to the wiping control unit when the raindrop sensor detects a water droplet above the threshold value on the windshield, and the water droplet detected by the raindrop sensor on the windshield is less than the threshold value the stop signal wiper control apparatus according to claim 1 or 2, wherein the input to the storage control unit to. The wiper blade is wiped on the windshield by a wiper motor that rotates forward and backward within a range of a predetermined rotation angle,
When the stop signal is input, the storage control unit rotates the wiper motor forward and reverse at a rotation angle larger than the predetermined rotation angle, thereby reversing the wiper blade at the enlargement upper reversal position. The wiper control device according to any one of claims 1 to 6 , wherein control is performed.

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