JP2014201190A - Wiper device - Google Patents

Abstract

Provided is a wiper device capable of continuing the ejection of cleaning liquid until the wiper blade reaches a predetermined position and capable of rotating the wiper blade a predetermined number of times after the completion of the ejection of the cleaning liquid. A wiper control circuit calculates a position of a wiper blade on a windshield from a rotation angle of an output shaft detected by a sensor provided in a deceleration mechanism of the wiper motor. Based on the above, the wiper blades 28 and 30 reciprocate between the lower inversion position P2 and the upper inversion position P1 for the first predetermined number of times to operate the washer motor 56 until reaching the lower inversion position P2. The wiper control circuit 22 operates the wiper motor from the lower inversion position P2 until the wiper blades 28, 30 reciprocate for a second predetermined number of times until reaching the lower inversion position P2. [Selection] Figure 1

Description

  The present invention relates to a wiper device.

  In the wiper device, by turning on a washer switch in the vehicle, a washer motor that transports the cleaning liquid in the washer tank is operated to inject the cleaning liquid in the washer tank onto the windshield of the vehicle. Further, by turning on the washer switch, the wiper motor for driving the wiper is operated in conjunction with the above-described ejection of the cleaning liquid, and the wiper blade is reciprocated on the windshield a predetermined number of times.

  In the wiper control device described in Patent Document 1, when the washer switch is turned on, the washer motor is activated for a predetermined time to inject the cleaning liquid, and the wiper motor starts to operate in conjunction with the operation of the washer motor. Further, after the operation of the washer motor is completed and the spraying of the cleaning liquid is stopped, the wiper motor operates so that the wiper blade reciprocates on the windshield a predetermined number of times.

JP 2007-45187

  However, the wiper control device described in Patent Document 1 has a problem that the position of the wiper blade on the windshield is not constant when the operation of the washer motor is completed. Therefore, depending on the position of the wiper blade at the end of the operation of the washer motor, there is insufficient wiping of the cleaning liquid due to the subsequent reciprocating rotation of the wiper blade, or the wiper blade is reciprocally rotated even after the cleaning liquid is completely wiped. There was a risk of unpleasant chatter noise.

  The present invention has been made in view of the above, and provides a wiper device capable of continuing the ejection of the cleaning liquid until the wiper blade reaches a predetermined position and capable of rotating the wiper blade a predetermined number of times after the completion of the ejection of the cleaning liquid. For the purpose.

  In order to solve the above-described problem, the wiper device according to claim 1, wherein a wiper motor that rotates forward and backward at a predetermined rotation angle and rotates a wiper blade connected via a wiper arm on a window glass; Detecting means for detecting a rotation angle of the wiper motor; a washer motor for injecting a cleaning liquid in the tank onto the window glass from a nozzle communicated with the tank via a predetermined pipe; and the washer motor by operating a switch; Based on the position of the wiper blade on the window glass calculated from the rotation angle of the wiper motor detected by the detection means, the wiper blade is moved from a lower reverse position to a first predetermined position. Stopping the operation of the washer motor when the rotation is performed a first predetermined number of times to reach a predetermined position; and Serial wiper blade is provided with a control means for actuating the wiper motor up to the lower reversing position a second predetermined rotation relative to the predetermined position by performing a second predetermined number of times.

  According to this wiper device, the control means calculates the position of the wiper blade on the window glass from the rotation angle of the wiper motor detected by the detection means, and based on the calculated position, determines the timing of spraying the cleaning liquid and the operation of the wiper motor. I have control.

  The control means stops the spraying of the cleaning liquid when the wiper blade reaches the predetermined position by performing the first predetermined rotation for the first predetermined number of times, and after the stop, the wiper blade performs the second predetermined rotation. Is controlled to be performed a second predetermined number of times. With this control, the cleaning liquid can be continuously sprayed until the wiper blade reaches a predetermined position, and the wiper blade can be rotated a predetermined number of times after the cleaning liquid has been sprayed.

  The wiper device according to a second aspect is the wiper device according to the first aspect, wherein the first predetermined rotation and the second predetermined rotation are performed so that the wiper blade is inverted upward from the lower inversion position. The reciprocating rotation is reversed at a position and reaches the lower reverse position, and the predetermined position is the lower reverse position.

  According to this wiper apparatus, the control means performs the reciprocating rotation as the first predetermined rotation from the start of operation of the wiper blade for the first predetermined number of times until the cleaning liquid is ejected by the washer motor. The control is continued. Further, the control means controls the wiper motor so that the wiper blade performs the reciprocating rotation as the second predetermined rotation after the completion of the ejection of the cleaning liquid for the second predetermined number of times. With this control, the cleaning liquid can be continuously sprayed until the wiper blade reaches a predetermined position, and the wiper blade can be rotated a predetermined number of times after the cleaning liquid has been sprayed.

  The wiper device according to claim 3 is the wiper device according to claim 1, wherein the first predetermined rotation and the second predetermined rotation are between the lower inversion position and the upper inversion position. One-way rotation.

  According to this wiper apparatus, the control means performs the one-way rotation as the first predetermined rotation from the start of operation of the wiper blade for the first predetermined number of times until the cleaning liquid is ejected by the washer motor. Is controlled to continue. Further, the control means controls the wiper motor so that the wiper blade performs one-way rotation as the second predetermined rotation after the completion of the cleaning liquid injection for the second predetermined number of times. With this control, the cleaning liquid can be continuously sprayed until the wiper blade reaches a predetermined position, and the wiper blade can be rotated a predetermined number of times after the cleaning liquid has been sprayed.

  A wiper device according to a fourth aspect is the wiper device according to the third aspect, wherein the predetermined position is the upper inverted position.

  Further, according to this wiper device, the first predetermined rotation, which is one-way rotation, is performed an odd number of times, so that the spraying of the cleaning liquid can be stopped when the wiper blade reaches the upper reverse position.

It is the schematic which shows the structure of the wiper apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the timing chart of the wiper apparatus which concerns on embodiment of this invention. It is a flowchart which shows an example of a process of the wiper control circuit of the wiper apparatus which concerns on embodiment of this invention. It is the schematic diagram which showed an example of the state immediately before the injection of the cleaning liquid of the wiper apparatus which concerns on embodiment of this invention is completed. It is the schematic diagram which showed the modification of the state just before completion of injection of the washing | cleaning liquid of the wiper apparatus which concerns on embodiment of this invention.

  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 a windshield 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 wiper control circuit 22. It has.

  The wipers 14 and 16 are constituted by wiper arms 24 and 26 and wiper blades 28 and 30, respectively. The base ends of the wiper arms 24 and 26 are fixed to pivot shafts 42 and 44, which will be described later, and the wiper blades 28 and 30 are fixed to the distal ends of the wiper arms 24 and 26, respectively.

  In the wipers 14 and 16, the wiper blades 28 and 30 reciprocate on the windshield 12 as the wiper arms 24 and 26 rotate, and the wiper blades 28 and 30 wipe the windshield 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 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 rotatably connected to one end side of the first link rod 36. Further, the other end side of the first link rod 36 is rotatably 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. Both ends of the second link rod 46 are rotatably connected to the end different from the above and the end of the pivot lever 40 corresponding to the end of the pivot lever 38.

  The pivot shafts 42 and 44 are rotatably supported by a pivot holder (not shown) provided on the vehicle body. The ends of the pivot levers 38 and 40 having the pivot shafts 42 and 44 are connected to the pivot shafts 42 and 44. The wiper arms 24 and 26 are fixed to each other.

  In the wiper device 10 according to the present embodiment, when the output shaft 32 rotates forward and backward within the rotation range θ, the rotational force of the output shaft 32 is transmitted to the wiper arms 24 and 26 via the link mechanism 20. As the wiper arms 24 and 26 reciprocate, the wiper blades 28 and 30 reciprocate between the lower inversion position P2 and the upper inversion position P1 on the windshield 12.

  A wiper control circuit 22 for controlling the rotation of the wiper motor 18 is connected to the wiper motor 18.

  The wiper control circuit 22 according to the present embodiment includes, for example, a drive circuit that generates current for operating the wiper motor 18 by PWM control and supplies the current to the wiper motor 18.

  If the wiper motor 18 is a brushless DC motor, the drive circuit includes an inverter circuit using a MOSFET as a switching element, and outputs a current with a predetermined duty ratio under the control of a microcomputer provided in the wiper control circuit 22. .

  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. .

  A sensor is provided in the speed reduction mechanism 52 of the wiper motor 18. The sensor includes an element (for example, a Hall IC) for detecting a magnetic field (magnetic force) of a magnet that rotates in conjunction with the output shaft 32. A sensor signal from the sensor is input to the wiper control circuit 22.

  Further, the wiper control circuit 22 according to the present embodiment can calculate the positions of the wiper blades 28 and 30 on the windshield 12 from the rotation angle of the output shaft 32 detected by the sensor included in the sensor signal. is there.

  Further, the wiper device 10 according to the present embodiment conveys the cleaning liquid in the washer tank so that the cleaning liquid in the washer tank is sprayed onto the windshield 12 from a nozzle communicated with the washer tank via a predetermined pipe. A washer motor 56 is provided. The washer motor 56 does not need to control the rotational speed as strictly as the wiper motor 18 and may be a motor with a DC brush that can be downsized. When the washer motor 56 is operated, the cleaning liquid is ejected from the washer nozzles 58 and 60, and the ejection areas Q 1, Q 2, Q 3, and Q 4 are formed on the windshield 12.

  The switch box 50 is a device including a plurality of switches for turning on or off the power supplied from the power source 54 to the wiper motor 18 and the washer motor 56.

  The switch box 50 includes a wiper switch and a washer switch as follows. The wiper switch includes a low speed operation mode selection position for rotating the wiper blades 28 and 30 at a low speed, a high speed operation mode selection position for rotating the wiper blades 28 and 30 at a high speed, an intermittent operation mode selection position for intermittent rotation at a constant period, It is possible to switch to the stop) mode selection position. When the washer switch is turned on, the washer motor 56 is operated to inject the cleaning liquid onto the windshield 12, and the wiper motor 18 so that the wiper blades 28 and 30 reciprocate on the windshield a predetermined number of times. Is activated. The switch box 50 outputs a signal corresponding to the selected position of each mode of the wiper switch or a signal that the washer switch is turned on to the wiper control circuit 22.

  When the signal output from the wiper switch according to the selected position of each mode or the signal when the washer switch is turned on is input to the wiper control circuit 22, the wiper control circuit 22 is based on the respective signals. Alternatively, the washer motor 56 is controlled.

  FIG. 2 is a diagram illustrating an example of a timing chart of the wiper device 10 according to the embodiment of the present invention. FIG. 2 shows a case where the washer switch is turned on while the wiper switch is turned off, that is, in a state where the wiper blades 28 and 30 are stopped at the lower inversion position P2. The positions of the wiper blades 28 and 30 on the windshield 12 are shown in the upper part of FIG. In the present embodiment, the position of the wiper blades 28 and 30 on the windshield 12 is detected by a sensor provided in the speed reduction mechanism 52 of the wiper motor 18.

  In the lower part of FIG. 2, times t0 to t8 are shown. For example, when the wiper blades 28 and 30 are moved from the lower inversion position P2 to the upper inversion position P1, or when the wiper motor 18 is moved as shown in t1. It indicates the time when an event such as the start of operation has changed. Although the time between t0 to t8 is not equal, in FIG. 2, it is drawn at substantially equal intervals for convenience.

  Further, “N1” in FIG. 2 represents a period during which the cleaning liquid is jetted in the present embodiment. In the present embodiment, N1 indicates that the wiper motor 18 starts operating at time t1 from the state where the wiper blades 28 and 30 are stopped at time t0, and the wiper blade is reversed at the upper reverse position at time t2. It is assumed that the process returns to the lower inversion position at time t3.

  The wiper control circuit 22 turns on the washer switch at time t0 and starts the operation of the wiper motor 18 at time t1. The reason why the operation of the wiper motor 18 is delayed from the operation of the washer motor 56 is that the wiper blades 28 and 30 need to be reciprocally rotated in a state where the washing seat is appropriately jetted onto the windshield 12. The difference between the times t0 and t1, which is the timing for delaying the operation of the wiper motor 18 relative to the operation of the washer motor 56, is the time from when the spraying of the cleaning liquid is started until the windshield 12 is sufficiently wetted. Since the difference between t0 and t1 depends on conditions such as the spray amount of the cleaning liquid per unit time or the area of the windshield 12, it is estimated by simulation based on a plurality of past cases, and further experimental It is preferable to determine this.

  The wiper control circuit 22 starts the operation of the wiper motor 18 at time t1 and rotates the wiper blades 28 and 30. The wiper control circuit 22 detects the position of the wiper blades 28 and 30 on the windshield 12 by a sensor provided in the speed reduction mechanism 52 of the wiper motor 18, and the wiper blades 28 and 30 are reversed at the upper reversal position P1. At time t3 when returning to the lower inversion position P2, the operation of the washer motor 56 is stopped, and the spraying of the cleaning liquid is stopped.

  In the present embodiment, the wiper blades 28 and 30 that have started operating and started rotating in conjunction with the washer motor 56 are reversed from the lower inversion position P2 to the upper inversion position P1, and then reach a predetermined position. The rotation up to is the first predetermined rotation. In the present embodiment, the washer motor 56 is operated until the first predetermined rotation is performed a first predetermined number of times.

  In the above description, the first predetermined rotation is a reciprocal rotation from the lower inversion position P2 to the upper inversion position P1 and reaching the lower inversion position P2, and the predetermined position is the lower inversion position P2. However, the first predetermined rotation may be a one-way rotation from the lower inversion position P2 to the upper inversion position P1 or from the upper inversion position P1 to the lower inversion position P2. The first predetermined number of times is one in the case where the first predetermined rotation is a reciprocating rotation. However, if the windshield 12 needs to be sufficiently cleaned with the cleaning liquid, the first predetermined number of times is The predetermined number of times may be two or more. Further, when the first predetermined rotation is not a reciprocal rotation but a one-way rotation, the predetermined position is turned upside down as in a modification example described later by performing the one-way rotation once or three times. It is also possible to set the position P1.

  In the wiper control circuit 22, the wiper blades 28 and 30 reach the upper inversion position P1 at time t4, return to the lower inversion position P2 at time t5, reach the upper inversion position P1 at time t6, and lower inversion position P2 at time t7. The wiper motor 18 is actuated until it returns to. Then, when the wiper blades 28 and 30 return to the lower reverse position P2 at time t7, the wiper motor 18 is stopped, and a series of processes triggered by the turning on of the washer switch is ended.

  In the present embodiment, the lower inversion position P2, which is the position of the wiper blades 28, 30 at the end of the cleaning liquid injection, is set as a predetermined position, and the wiper blades 28, 30 are inverted from the lower inversion position P2 to the upper inversion position P1. A reciprocating rotation returning to the lower inversion position P2 is defined as a second predetermined rotation. In the present embodiment, the second predetermined rotation is performed a second predetermined number of times. The second predetermined number of times is two in the above, but it may be one if it is sufficient to wipe off the sprayed cleaning liquid, and in the case where there are many sprayed cleaning liquids, the second predetermined number of times is It may be more than 2 times.

  The second predetermined rotation may be a one-way rotation between the lower inversion position P2 and the upper inversion position P1. When the first predetermined rotation is not a reciprocal rotation but a one-way rotation, and the predetermined position, which is the position of the wiper blades 28 and 30 when the cleaning liquid is ejected, is the upper inversion position P1, the second The predetermined rotation is also one-way rotation. By performing such one-way rotation an odd number of times as the second predetermined number of times, the wiper motor 18 can be operated until the wiper blades 28 and 30 reach the lower inversion position P2 as in a modified example described later.

  As described above, in FIG. 2, the wiper control circuit 22 detects the position of the wiper blades 28 and 30 by the sensor provided in the speed reduction mechanism 52, and stops the washer motor 56 and the wiper motor 18. The timing is determined. In FIG. 2, the washer motor 56 is operated so that the cleaning liquid is sprayed while the wiper blades 28 and 30 are reciprocally rotated for the first time. And the upper inversion position P1 are reciprocated twice.

  As shown in FIG. 2, by spraying the cleaning liquid while the wiper blades 28 and 30 first make one reciprocation, the cleaning liquid sufficient to wipe the wiper blades 28 and 30 is sprayed onto the windshield 12. Can do. Further, the cleaning liquid on the windshield 12 can be wiped by rotating the wiper blades 28 and 30 twice after the spraying of the cleaning liquid stops.

  FIG. 3 is a flowchart showing an example of processing of the wiper control circuit 22 of the wiper apparatus 10 according to the present embodiment. In step 300, it is determined whether or not the washer switch is turned on. If the determination is affirmative, the operation of the washer motor 56 is started in step 302.

  In step 304, the operation of the wiper motor 18 is started after a slight time difference from the start of operation of the washer motor 56. In step 306, whether or not the wiper blades 28 and 30 start rotating from the lower inversion position P2, reverse at the upper inversion position P1, and return to the lower inversion position P2 is determined by a sensor provided in the speed reduction mechanism 52. Determine based on the detection result. If the determination in step 306 is affirmative, the washer motor 56 is stopped in step 308 to stop the ejection of the cleaning liquid.

  In step 310, it is determined whether or not the wiper blade has reciprocated between the lower inversion position P2 and the upper inversion position P1 a predetermined number of times after the washer motor 56 has stopped. In the present embodiment, the predetermined number of times is two. If the determination in step 310 is affirmative, the wiper motor 18 is stopped in step 312 and a series of processes triggered by turning on the washer switch is terminated.

  FIG. 4 is a schematic diagram illustrating an example of a state immediately before the cleaning liquid ejection of the wiper apparatus 10 according to the present embodiment is completed. In FIG. 4, after the washing liquid is sprayed from the washer nozzles 58 and 60 by the operation of the washer motor 56 and the spray areas Q1, Q2, Q3 and Q4 are formed on the windshield 12, the wiper blades 28 and 30 are moved downward. In this state, the reversal position P2 is reached. Immediately before the wiper blades 28 and 30 are reversed from the lower inversion position P2, the spraying of the cleaning liquid is stopped. Thereafter, the lower inversion position P2 and the upper inversion position P1 are reciprocated twice and stopped at the lower inversion position P2.

  FIG. 5 is a schematic view showing a modification of the state immediately before the cleaning liquid injection of the wiper apparatus 10 according to the present embodiment is completed. The modification of FIG. 5 shows a case where the first predetermined rotation and the second predetermined rotation are one-way rotation between the lower inversion position P2 and the upper inversion position P1.

  In the modification of FIG. 5, the cleaning liquid is sprayed once, three times, or five times as the first predetermined number of times when the wiper blades 28 and 30 rotate from the lower inversion position P2 to the upper inversion position P1. It continues until. It is desirable to increase the number of times the wiper blades 28 and 30 are rotated in one way during the spraying of the cleaning liquid if the windshield 12 is large. Even when the amount of cleaning liquid sprayed per unit time is small, it is desirable to increase the number of times the wiper blades 28 and 30 rotate one way while spraying the cleaning liquid.

  In FIG. 5, after the spraying of the cleaning liquid is stopped, the wiper blades 28, 30 are rotated one-way, three times or five times as the second predetermined number of times, so that the wiper blades 28, 30 are in the lower inverted position P2. The wiper motor 18 is operated until it reaches The number of times that the wiper blades 28 and 30 rotate one way on the windshield 12 after spraying the cleaning liquid may depend on conditions such as the area of the windshield 12. For example, when the area of the windshield 12 is large, the one-way rotation of the wiper blades 28 and 30 may be performed five times after spraying the cleaning liquid.

  In the modification of FIG. 5, when the one-way rotation that is the first predetermined rotation is performed an even number of times, the predetermined position becomes the lower inversion position P2. The wiper motors 18 and 30 can be operated until the wiper blades 28 and 30 reach the lower reverse position P2 by performing the one-way rotation that is the second predetermined rotation from the lower reverse position P2 even times. it can.

  In the present embodiment, the wiper blades 28 and 30 after jetting the cleaning liquid and after the jetting of the cleaning liquid are based on the positions of the wiper blades 28 and 30 on the windshield 12 detected by the sensor provided in the speed reduction mechanism 52 of the wiper motor 18. Is controlled. By such control, at the timing when the wiper blades 28, 30 reach the turning point, such as when the wiper blades 28, 30 reach the upper turning position P1 or the lower turning position P2, the cleaning liquid is jetted, the jetting is stopped, and the wiper blades 28, The number of 30 predetermined rotations can be arbitrarily set.

DESCRIPTION OF SYMBOLS 10 ... Wiper apparatus, 12 ... Windshield, 14, 16 ... Wiper, 18 ... Wiper motor, 20 ... Link mechanism, 22 ... Wiper control circuit, 24, 26 ... Wiper arm , 28, 30 ... wiper blade, 32 ... output shaft, 34 ... crank arm, 36 ... link rod, 38 ... pivot lever, 40 ... pivot lever, 42, 44 ...・ Pivot shaft, 46 ... Link rod, 50 ... Switch box, 52 ... Deceleration mechanism, 54 ... Power supply, 56 ... Washer motor, 58,60 ... Washer nozzle, P1 ..・ Upper reverse position, P2 ... Lower reverse position, Q1, Q2, Q3, Q4 ... Injection region

Claims (4)

A wiper motor that rotates on a window glass a wiper blade connected through a wiper arm by forward and reverse rotation at a predetermined rotation angle;
Detecting means for detecting a rotation angle of the wiper motor;
A washer motor for injecting the cleaning liquid in the tank onto the window glass from a nozzle communicated with the tank via a predetermined pipe;
The operation of the washer motor and the wiper motor is started by operating a switch, and the wiper blade is moved down based on the position of the wiper blade on the window glass calculated from the rotation angle of the wiper motor detected by the detecting means. When the first predetermined rotation is performed from the reverse position for the first predetermined number of times to reach the predetermined position, the operation of the washer motor is stopped, and the wiper blade is moved to the first position with respect to the predetermined position. Control means for operating the wiper motor until the second reverse position is reached by performing a predetermined rotation of 2 for a second predetermined number of times;
Wiper device with   The first predetermined rotation and the second predetermined rotation are reciprocating rotations in which the wiper blade is reversed from the lower reversal position at the upper reversal position and reaches the lower reversal position. The wiper device according to claim 1, wherein the position is the lower inversion position.   2. The wiper device according to claim 1, wherein the first predetermined rotation and the second predetermined rotation are one-way rotations between the lower inversion position and the upper inversion position.   The wiper device according to claim 3, wherein the predetermined position is the upper inversion position.

Images