JP6643927B2 - Wiper system and wiper system control method - Google Patents

Description

  The present invention relates to a control technique for a vehicle wiper system, and more particularly, to a technique for controlling washer liquid injection in a wiper system having a structure in which a window washer nozzle is disposed at a position of a wiper blade or a wiper arm.

  Generally, a vehicle such as an automobile is provided with a wiper device having a washer nozzle for injecting a washer liquid (washing liquid) for wiping raindrops and removing dirt from a windshield. In this case, the washer nozzle is usually provided with a washer nozzle. , Mounted on a front engine hood or a front hood of the vehicle. However, in such a wiper device, the washer liquid is injected outside the wiping area, and the use efficiency of the washer liquid is not good, or the distance from the injection port to the window glass is long. There was a problem such as being lost.

  Therefore, in recent years, from the viewpoints of the efficiency of use of the washer liquid and measures against deviation of the shooting point, in order to save water and ensure the visibility of the driver, a wiper device has been proposed in which a washer liquid injection port is arranged at a portion of a wiper blade or a wiper arm. I have. For example, in the wiper blade of Patent Literature 1, a water channel and an injection port of a washer liquid are provided along the blade longitudinal direction, and a water supply tube (water supply pipe) led from a washer tank is connected to the wiper blade. . Washer liquid is supplied to the water supply tube from a washer tank by a washer pump, and when the washer switch is turned on, the washer liquid is appropriately sprayed from the injection port in a wiper wiping direction (operation direction).

International Publication WO2013 / 080997

  In such a wiper device, in order to uniformly diffuse the washer liquid on the wiping surface, the wiper operation is monitored and an ejection operation corresponding to the wiper operation is performed. In addition, various controls such as stopping the injection at a predetermined angle (for example, near the reversing position) or controlling the injection amount according to the vehicle speed or the outside temperature reduce the water drainage phenomenon on the wiping surface. Prevents wiping. However, the wiping speed of the wiper blade is not constant during one wiping operation, but is slow in the vicinity of the upside-down reversing position and is high in the middle of the reversing position. For this reason, in the conventional operation mode which does not consider the speed change of the wiper blade, there is a problem that unevenness occurs in the diffusion of the washer liquid. That is, as shown in FIG. 5, in the vicinity of the reversal position where the wiping speed is low, the amount of water is excessive and water is likely to be generated. On the other hand, in the intermediate position where the wiping speed is high, there is a problem that the amount of water is insufficient and the wiping is likely to occur. there were.

  SUMMARY OF THE INVENTION It is an object of the present invention to reduce the water drainage phenomenon and the wiping by a wiper blade in a vehicle wiper system for injecting a washer liquid from a wiper blade or a wiper arm onto a wiping surface.

A wiper system according to the present invention is provided on a wiper blade that is disposed on a wiping surface and performs a reciprocating wiping operation between an upper and lower reversal position set on the wiping surface, and a wiper arm to which the wiper blade is attached. A washer nozzle capable of injecting a washer liquid in the direction of travel of the wiper blade, a washer pump for supplying the washer liquid to the washer nozzle, a pump motor for driving the washer pump, and a pump motor. A controller for controlling the operation, the controller is based on the operation information of the wiper blade, based on the operation information of the wiper liquid, so that the injection amount of the washer liquid is synchronized with the operation of the wiper blade, It controls the operation of the pump motor based on the operating speed of the wiper blade And wherein changing the operation of the pump motor.

  In the present invention, the injection amount of the washer liquid is controlled in accordance with the operation of the wiper blade. For this reason, an appropriate amount of washer liquid is supplied onto the wiping surface in accordance with the blade operation. Effectively suppressed.

In the above-mentioned wiper system, the controller suppresses the output of the pump motor near the reversal position where the operation speed of the wiper blade is slow to reduce the injection amount, and the upper / lower reversal position where the operation speed of the wiper blade is fast. In the intermediate region between the above, the output of the pump motor may be increased to increase the injection amount . The wiper system further includes a wiper operation detection unit that detects an operation speed of the wiper blade, and a washer liquid injection unit that determines an injection amount of the washer liquid from the operation speed of the wiper blade obtained by the wiper operation detection unit. A control unit and a pump motor operation control unit that determines the operation of the pump motor based on the determination of the washer liquid injection control unit and operates the pump motor may be provided.

A wiper system control method according to the present invention includes a wiper blade disposed on a wiping surface and performing a reciprocating wiping operation between an upper and lower reversal position set on the wiping surface, and a wiper arm to which the wiper blade is attached. A washer nozzle that is provided and can inject a washer liquid in the direction of movement of the wiper blade, a washer pump for supplying the washer liquid to the washer nozzle, and a pump motor that drives the washer pump. a method of controlling a wiper system comprising Te, based on the operation information of the wiper blade, as the injection amount of the washer fluid is synchronized with the operation of the wiper blade, and controls the operation of the pump motor, the wiper based on the blade operation speed of, it is characterized by changing the operation of the pump motor .

  In the present invention, the injection amount of the washer liquid is controlled in accordance with the operation of the wiper blade. For this reason, an appropriate amount of washer liquid is supplied onto the wiping surface in accordance with the blade operation. Effectively suppressed.

  According to the wiper system of the present invention, since the injection amount of the washer liquid is controlled in accordance with the operation of the wiper blade, it is possible to supply an appropriate amount of the washer liquid in accordance with the blade operation onto the wiping surface. . As a result, it is possible to suppress the water draining phenomenon due to the excessive injection at the part where the wiping speed is slow and the wiping phenomenon due to the shortage of the injection amount at the part where the wiping speed is fast.

  According to the wiper system control method of the present invention, since the injection amount of the washer liquid is controlled in accordance with the operation of the wiper blade, it is possible to supply an appropriate amount of the washer liquid in accordance with the blade operation onto the wiping surface. Becomes As a result, it is possible to suppress the water draining phenomenon due to the excessive injection at the part where the wiping speed is slow and the wiping phenomenon due to the shortage of the injection amount at the part where the wiping speed is fast.

FIG. 1 is an explanatory diagram illustrating a configuration of a wiper system according to an embodiment of the present invention. FIG. 3 is an explanatory diagram illustrating a configuration of a washer nozzle. FIG. 3 is a block diagram illustrating a circuit configuration of a controller. FIG. 4 is an explanatory diagram illustrating a relationship between a wiper blade position, a pump motor operation, and a nozzle ejection operation in the wiper system of the present invention. FIG. 10 is an explanatory diagram showing the washer fluid injection timing in a conventional wiper system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing a configuration of a wiper system according to an embodiment of the present invention. As shown in FIG. 1, the wiper system 1 includes wiper arms 2 a and 2 b on the driver's seat side and the passenger's seat side, and the wiper arms 2 a and 2 b are connected by a link mechanism 3. Wiper blades 4a and 4b for wiping the glass surface are attached to the wiper arms 2a and 2b. The wiper blades 4a, 4b are in resilient contact with the windshield (wiping surface) 5 by a spring member (not shown) or the like provided inside the wiper arms 2a, 2b. The link mechanism 3 is connected to the motor unit 6, and the wiper blades 4a and 4b are driven by the motor unit 6.

  The motor unit 6 includes a wiper motor 7 and a speed reduction mechanism 8. A sensor for detecting the relative position of the wiper blades 4a and 4b is provided on the wiper motor 7 side, and a sensor for detecting the absolute position (for example, the lower turning position) of the wiper blades 4a and 4b is provided on the speed reduction mechanism 8 side. ing. From the sensor for detecting the relative position, a pulse signal is generated with the rotation of the motor. Further, a single-shot signal is issued from the sensor for detecting the absolute position when the wiper blades 4a and 4b come to the lower inversion position. The current position (position angle) of the wiper blades 4a, 4b can be calculated by the combination of the single-shot signal and the pulse signal.

  In the wiper system 1, a washer nozzle 11 (11f: first nozzle, 11r: second nozzle) for discharging a washer liquid to the glass surface is provided on the wiper arms 2a, 2b. A washer liquid 13 is supplied to the washer nozzle 11 from a washer pump 12 in conjunction with a window washer switch (not shown). The washer pump 12 is driven by a pump motor 14 and supplies the washer liquid 13 in the washer tank 15 to the washer nozzle 11 via the water supply tube 16. The washer liquid 13 is jetted from the washer nozzle 11 at a pressure corresponding to the operating speed of the pump motor 14.

  FIG. 2 is an explanatory diagram illustrating the configuration of the washer nozzle 11. As shown in FIG. 2, the washer nozzle 11 is provided in a washer nozzle unit 17. The washer nozzle unit 17 is mounted on a tip portion of the wiper arms 2a, 2b, that is, a connection portion where the wiper blades 4a, 4b are attached to the wiper arms 2a, 2b. In the washer nozzle unit 17, a washer nozzle 11f is arranged on the forward path, and a washer nozzle 11r is arranged on the return path. In the washer nozzle 11, the washer liquid 13 is discharged from a nozzle on the front side in the traveling direction of the wiper blades 4a and 4b. That is, the washer liquid 13 is ejected from the washer nozzle 11f during the forward movement of the wiper blades 4a and 4b, and from the washer nozzle 11r during the backward movement. Switching between the nozzles 11f and 11r is performed by switching the rotation direction of the pump motor 14 (forward / reverse rotation). Here, the washer fluid 13 is ejected from the nozzle 11f during forward rotation of the motor and from the nozzle 11r during reverse rotation.

  A controller (wiper system control device) 9 is provided integrally with the motor unit 6, and the wiper motor 7 is controlled by the controller 9. The controller 9 is connected to a pump motor 14 via a connection line 10, and the pump motor 14 is also controlled by the controller 9. That is, the pump motor 14 is controlled by the controller 9 in synchronization with the wiper blades 4a and 4b, and an injection operation corresponding to the blade operation is performed.

  FIG. 3 is a block diagram illustrating a circuit configuration of the controller 9. As shown in FIG. 3, the controller 9 includes a CPU 21 in which a control program is installed, a ROM 22 storing various control data, a wiper motor drive circuit 23, a pump motor drive circuit 24, and an FET module 25. Have been. The CPU 21 calculates the position information (current position) of the wiper blades 4a and 4b based on the signals output from the sensors, and turns ON / OFF the FET in the FET module 25 while referring to the control data in the ROM 22. To control the forward / reverse rotation and rotation speed of the wiper motor 7.

  The CPU 21 controls the pump motor 14 in conjunction with a window washer switch (not shown), and discharges the washer liquid 13 onto the glass surface as appropriate in accordance with the positions of the wiper blades 4a and 4b. As shown in FIG. 3, the CPU 21 detects a position (angle), a traveling direction, and an operation speed (wiping speed) of the wiper blades 4a and 4b based on a sensor signal sent from the motor unit 6. A detection unit 31 is provided. Further, the CPU 21 determines the jetting direction of the washer fluid 13 from the current position and the advancing direction of the wiper blades 4a and 4b obtained by the wiper operation detecting unit 31, and determines the washer fluid 13 from the wiping speed of the wiper blades 4a and 4b. A washer liquid injection control unit 32 for determining the injection amount of the washer is provided. Further, a pump motor operation control unit 33 that determines the operation of the pump motor 14 based on the determination of the washer liquid injection control unit 32 and issues an instruction to the pump motor drive circuit 24 is provided downstream of the washer liquid injection control unit 32. Have been.

  In the wiper system 1 described above, the injection amount control synchronized with the wiper operation is performed in consideration of the operation state of the wiper blades 4a and 4b. Here, a control mode using the wiping speed of the wiper blades 4a and 4b as the wiper operation information will be described. FIG. 4 is an explanatory diagram showing the relationship between (a) the wiper blade position (angle), (b) wiping speed, and (c) pump motor operation in the wiper system of the present invention. In the wiper system 1, the wiping speed of the wiper blades 4 a and 4 b is constantly monitored by the wiper operation detector 31 of the CPU 21. Then, the operation of the pump motor 14 is controlled by the washer liquid injection controller 32 such that the injection amount of the washer liquid 13 is synchronized with the wiping speed. That is, the pump motor 14 is synchronously controlled in accordance with the wiping speed of the wiper blades 4a and 4b ((b) and (c) in FIG. 4).

  Accordingly, in the region P near the reversal position where the wiping speed of the wiper blades 4a and 4b is low, the output of the pump motor 14 is suppressed, and the injection amount of the washer liquid 13 is reduced to a small amount. As a result, the injection amount of the washer liquid 13 decreases near the upper limit inversion position, and excessive injection in a state where the blade speed is low is suppressed, and the drainage phenomenon is reduced. In the intermediate region Q where the wiping speed of the wiper blades 4a and 4b is high, the output of the pump motor 14 is increased, and the injection amount of the washer liquid 13 is increased. As a result, the injection amount of the washer liquid 13 increases in the middle part of the upside down position, and the shortage of the injection when the blade speed is high is eliminated, and the wiping phenomenon is reduced. When the wiper blades 4a and 4b are stopped due to an obstacle or a voltage drop, the injection of the washer liquid 13 is also stopped.

  As described above, in the wiper system 1 of the present invention, since the injection amount of the washer liquid 13 is controlled in accordance with the wiping speed of the wiper blades 4a and 4b, an appropriate amount of the washer liquid 13 according to the blade operation can be obtained. Supplied on the wiping surface. For this reason, it is possible to effectively suppress the water draining phenomenon due to the excessive injection in the part where the wiping speed is slow and the wiping phenomenon due to the shortage of the injection amount in the part where the wiping speed is fast. Further, since an appropriate amount of the washer liquid 13 is supplied, the washer liquid 13 can be saved. Furthermore, when the wiper blades 4a, 4b stop halfway during wiping, the injection of the washer liquid 13 is stopped, so that the visibility of the driver due to the washer liquid 13 can be prevented from being deteriorated.

The present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the scope of the invention.
For example, in the above-described embodiment, the configuration in which the wiping speed of the wiper blades 4a and 4b is used as the wiper operation information and the injection amount of the washer liquid 13 is synchronously controlled in accordance with the blade wiping speed has been described. Alternatively, the current position (angle) of the wiper blades 4a, 4b may be used as wiper operation information, and the injection amount of the washer liquid 13 may be controlled according to the blade angle. That is, based on the blade angle (FIG. 4A), the injection amount of the washer liquid 13 may be controlled so that the output of the pump motor 14 is suppressed in the region P and the output of the pump motor 14 is increased in the region Q. .

  Further, in the above-described embodiment, an example in which the present invention is applied to the parallel wiping type wiper system 1 of the two-motor forward / reverse drive has been described. However, the form of the wiper system is not limited to this, and the two-motor forward / reverse drive. The present invention is also applicable to other types of wiper systems, such as an opposing wiping type wiper system and a parallel wiping type driven by one motor forward / reverse. Further, the mechanical configuration of the wiper system is not limited to the above-described one. For example, the present invention can be applied to a wiper system having a configuration in which a wiper arm is attached to an output shaft of a wiper motor without using a link mechanism. is there. In addition, the wiper motor 7 and the pump motor 14 may be a motor with a brush or a brushless motor.

DESCRIPTION OF SYMBOLS 1 Wiper system 2a, 2b Wiper arm 3 Link mechanism 4a, 4b Wiper blade 5 Windshield (wiping surface)
Reference Signs List 6 Motor unit 7 Wiper motor 8 Reduction mechanism 9 Controller 10 Connection line 11 Washer nozzle 11f Washer nozzle (forward-direction wiping operation direction injection: first nozzle)
11r Washer nozzle (injection direction of return path wiping operation: second nozzle)
12 Washer pump 13 Washer liquid 14 Pump motor 15 Washer tank 16 Water supply tube 17 Washer nozzle unit 21 CPU
22 ROM
23 Wiper motor drive circuit 24 Pump motor drive circuit 25 FET module 31 Wiper operation detection unit 32 Washer liquid injection control unit 33 Pump motor operation control unit P Inversion position vicinity area Q Intermediate area

Claims (4)

A wiper blade disposed on the wiping surface and performing a reciprocating wiping operation between the upper and lower reversing positions set on the wiping surface,
A washer nozzle provided on a wiper arm to which the wiper blade is attached, and capable of injecting a washer liquid in a traveling direction of the wiper blade;
A washer pump for supplying the washer liquid to the washer nozzle,
A pump motor for driving the washer pump;
A controller for controlling the operation of the pump motor, and a wiper system comprising:
The controller, based on the operation information of the wiper blade, controls the operation of the pump motor so that the injection amount of the washer liquid is synchronized with the operation of the wiper blade, based on the operation speed of the wiper blade. A wiper system for changing the operation of the pump motor . The wiper system according to claim 1,
The controller suppresses the output of the pump motor in the vicinity of the reversal position where the operation speed of the wiper blade is slow to reduce the injection amount, and in the intermediate region between the upper and lower reversal positions where the operation speed of the wiper blade is fast. A wiper system, wherein the output of the pump motor is increased to increase the injection amount . The wiper system according to claim 1 or 2,
A wiper operation detector for detecting an operation speed of the wiper blade,
A washer liquid injection control unit that determines an injection amount of the washer liquid from an operation speed of the wiper blade obtained by the wiper operation detection unit;
A wiper system comprising: a pump motor operation control unit that determines the operation of the pump motor based on the determination of the washer liquid injection control unit and operates the pump motor. A wiper blade disposed on the wiping surface and performing a reciprocating wiping operation between the upper and lower reversing positions set on the wiping surface,
A washer nozzle provided on a wiper arm to which the wiper blade is attached, and capable of injecting a washer liquid in a traveling direction of the wiper blade;
A washer pump for supplying the washer liquid to the washer nozzle,
A pump motor for driving the washer pump, and a control method of a wiper system comprising:
Based on the operation information of the wiper blade, the operation of the pump motor is controlled so that the injection amount of the washer liquid is synchronized with the operation of the wiper blade, and the pump motor is controlled based on the operation speed of the wiper blade. Controlling the operation of the wiper system.

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