JP6077771B2 - Wiper device - Google Patents

Description

  The present invention relates to a wiper device.

  Patent Document 1 describes a wiper control device including a switching stage that cuts off power supplied to a wiper motor when a wiper blade moving toward a reversal position reaches before the reversal position.

  The wiper control device described in Patent Document 1 causes the wiper blade to coast by cutting off the power supplied to the wiper motor before the reversing position by the switching stage described above, and the reversing sound when the wiper blade reverses at the reversing position. Is supposed to be reduced.

JP 2003-54375 A

  However, in the wiper control device described in Patent Document 1, since the wiper blade is suddenly decelerated by cutting off the power supplied to the wiper motor, the smooth operation of the wiper device is impaired, and abnormal noise is likely to occur. There was a problem.

  The present invention has been made in view of the above, and an object of the present invention is to provide a wiper device that operates smoothly and can suppress the occurrence of abnormal noise when the wiper blade is reversed and stopped.

In order to solve the above-mentioned problem, a wiper device according to claim 1 includes a wiper motor that reciprocally rotates on a window glass a wiper blade that is forwardly and reversely rotated at a predetermined rotation angle and connected via a wiper arm. The upper and lower predetermined positions of the area where the wiper blade reciprocates on the window glass are respectively stored as stop target positions that are positions where the wiper blade should stop, and at the upper stop target position . A stop permission that allows the wiper blade to stop a predetermined range on the lower side of the window glass from a certain upper reversal position and a predetermined range on the upper side of the window glass from the lower reverse position that is the lower stop target position. A rotation angle of the wiper motor when the wiper blade rotates between the upper stop target position and the lower stop target position. The storage means storing a speed map that defines the rotation speed of the wiper motor, the detection means for detecting the rotation speed and rotation angle of the wiper motor, the storage means, and the wiper motor detected by the detection means. The position of the wiper blade on the window glass is specified based on the rotation angle, and the rotation speed of the wiper motor is decelerated as the wiper blade being reciprocally rotated approaches each of the stop permission ranges based on the speed map. The rotation of the wiper motor is stopped when the wiper blade stops within the stop permission range, and when the wiper blade does not stop within the stop permission range , the rotation angle detected by the detection means is detected. The wiper motor is controlled to rotate so that the rotation speed of the corresponding speed map is the same, and the wiper And a control means for stopping in the stop permission range blade.

  According to this wiper device, since the rotation speed of the wiper motor is reduced as the wiper blade approaches the stop permission range, the generation of abnormal noise when the wiper blade is reversed and stopped is prevented, and the wiper device operates smoothly. can do.

  Further, since the wiper blade stops within the stop permission range provided below the window glass, it suppresses variations in the stop position of the wiper blade and makes the wiper blade wiping a wide area other than the stop permission range. Can be set.

The wiper device according to a second aspect is the wiper device according to the first aspect, wherein the control means is configured such that , based on the speed map, the rotating wiper blade is moved from the vicinity of an intermediate point of the reciprocating rotation stroke. The rotation speed of the wiper motor is decelerated as approaching each of the stop target positions, and when the wiper blade stops within the stop permission range, the rotation of the wiper motor is stopped, and after the stop, the wiper motor is immediately before the stop. Is configured to rotate the wiper blade stopped in the stop permission range by rotating in the reverse direction.

  According to this wiper device, the rotation speed of the wiper motor is reduced as it approaches the stop target position, so that the wiper blade stops before the stop target position due to friction between the wiper blade and the window glass or sliding resistance due to wind pressure. Even in this case, the wiper blade can be reversed.

  In this wiper device, if the wiper blade stop position is within the stop permission range, the wiper blade can be reversed from the stop permission range without rotating the wiper blade to the stop target position again. It becomes possible to move.

According to a third aspect of the present invention, in the wiper device according to the first or second aspect , the wiper device further includes a wiper switch for inputting a command for operating or stopping the wiper motor, and the storage unit is configured to stop the lower portion. As a target position, a lower inversion position that stops when the wiper blade reverses in the reciprocating rotation and a storage position that is provided below the lower inversion position and stores the wiper blade are stored, and the lower inversion A predetermined range on the upper side of the window glass from a position and a predetermined range on the upper side of the window glass from the storage position are respectively stored as a stop permission range in which the wiper blade can be stopped, and the wiper blade, The rotational speed of the wiper motor relative to the rotational angle of the wiper motor when rotating from the lower reverse position to the retracted position is the speed map. Puyori also store the storage speed map defining low, the control unit, when the command where the wiper blade stops the wiper motor from the wiper switch during the reciprocating rotation is input, based on the speed map , the wiper blade to decelerate the rotational speed of the wiper motor as it approaches the said lower reversal position, after the wiper blade stops at the stop permission range including the lower reversing position, based on the stored speed map, the wiper motor When the wiper blade is rotated at a lower speed than the reciprocating rotation, the rotation speed of the wiper motor is decelerated as the wiper blade approaches the retracted position, and the wiper blade is stopped within a stop permission range including the retracted position. The rotation of the wiper motor is stopped.

  According to this wiper device, when the wiper switch is turned off, the wiper blade that is reciprocally rotating is temporarily stopped at the lower reverse position, and then the wiper blade is rotated to the stop target position at a lower speed than the reciprocating rotation. Therefore, overrun of the wiper blade due to overspeed can be prevented.

  Further, according to this wiper device, since the rotation of the wiper motor is decelerated as approaching the stop target position, it is possible to prevent the wiper blade from suddenly decelerating at the stop target position, and to suppress the generation of noise due to the sudden deceleration.

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 speed map of the wiper apparatus which concerns on embodiment of this invention. It is a figure which shows the modification of the speed map of the wiper apparatus which concerns on embodiment of this invention. It is a flowchart which concerns on control of the microcomputer in 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 is rotated in the forward and reverse directions within the rotation range θ1, 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.

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

  The storage position P3 is provided below the lower inversion position P2. From the state where the wiper blades 28 and 30 are in the lower inversion position P2, the output shaft 32 rotates θ2 to rotate the wiper blades 28 and 30 to the storage position P3. The value of θ2 can take various values depending on the structure of the link mechanism of the wiper device, but the rotation of the wiper blades 28 and 30 from the lower inversion position P2 to the storage position P3 provided several cm to 10 cm below. The moving range is acceptable.

  When θ2 is “0”, the lower inversion position P2 and the storage position P3 coincide, and the wiper blades 28 and 30 are stopped and stored at the lower inversion position P2.

  In the present embodiment, a stop permission position P4 is provided in front of the storage position P3, and an area between the stop permission position P4 and the storage position P3 is set as a stop permission range R1.

  Ideally, the wiper blades 28 and 30 stop exactly at the storage position P3 when the wiper device stops.

  However, even if the rotational speed of the wiper motor 18 is decelerated so that the wiper blades 28 and 30 stop at the storage position P3, the wiper blades 28 and 30 do not smoothly decelerate and suddenly stop at the storage position P3. is there. In the present embodiment, as the wiper blades 28 and 30 approach the stop permission range R1, the rotation of the wiper motor 18 is gradually decelerated, and the wiper blade is within the stop permission range R1 provided before the storage position P3 or the storage position P3. 28 and 30 can be stopped.

  Further, a lower inversion permission position P5 is provided in front of the lower inversion position P2, and a stop and inversion of the wiper blades 28 and 30 are permitted in an area between the lower inversion position P2 and the lower inversion permission position P5. The inversion permission range R2 is set.

  Further, an upper inversion permission position P6 is provided in front of the upper inversion position P1, and the wiper blades 28 and 30 are allowed to stop and invert in an area between the upper inversion position P1 and the upper inversion permission position P6. The inversion permission range R3.

  Even when the wiper blades 28 and 30 are reversed, it is ideal that the wiper blades 28 and 30 are stopped accurately at the upper inversion position P1 or the lower inversion position P2. However, it is difficult to accurately stop the actual wiper blades 28 and 30 at predetermined positions. In the present embodiment, the rotation of the wiper motor 18 is gradually decelerated as the wiper blades 28 and 30 approach the upper reversal permitted range R3 or the lower reversal permitted range R2, and within the upper reversal permitted range R3 or the lower reversal permitted range R2. The wiper blades 28 and 30 can be stopped.

  In FIG. 1, the lower inversion position P2 is set above the stop permission range R1, but if it is before the storage position P3, the lower inversion position P2 is provided within the stop permission range R1. Also good.

  Alternatively, the lower inversion position P2 and the storage position P3 may match. In this case, the stop permission range R1 and the lower inversion permission range R2 overlap.

  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 generates, for example, a sensor 54 that detects the rotation speed and rotation angle of the output shaft 32 of the wiper motor 18 and a current for operating the wiper motor 18 by PWM control to generate the wiper motor 18. A drive circuit 56 is provided.

  If 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 outputs a current having 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 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 sensor 54 is provided in the speed reduction mechanism 52 of the wiper motor 18 and 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.

  Further, the wiper control circuit according to the present embodiment can calculate the position of the wiper blades 28 and 30 on the windshield 12 from the rotation angle of the output shaft 32 detected by the sensor 54, and the output shaft 32 of the output shaft 32 according to the position. A microcomputer 58 that controls the drive circuit 56 so as to change the rotation speed and a memory 60 that stores data used to control the drive circuit 56 are configured. The wiper switch 50 is connected to the microcomputer 58. Yes.

  The memory 60 stores a speed map that defines the rotational speed of the output shaft 32 in accordance with the positions of the wiper blades 28 and 30 on the windshield 12.

  The microcomputer 58 controls the driving circuit 56 according to the speed map stored in the memory 60 when the wiper switch 50 is turned on.

  The wiper switch 50 is a switch that turns on or off the power supplied from the vehicle battery to the wiper motor 18.

  The wiper switch 50 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 rotating the wiper blades 28 and 30 intermittently at a constant cycle, and storage. Switching to the (stop) mode selection position is possible. Further, a signal corresponding to the selected position of each mode is output to the microcomputer 58.

  When a signal output from the wiper switch 50 according to the selected position of each mode is input to the wiper control circuit 22, the wiper control circuit 22 stores control corresponding to the output signal from the wiper switch 50 in the memory 60. According to the speed map.

  FIG. 2 is a diagram illustrating an example of a speed map of the wiper device according to the present embodiment. The vertical axis in FIG. 2 is the rotational speed of the output shaft 32 that changes corresponding to the rotational speed of the wiper motor 18, and the horizontal axis is the rotational angle of the output shaft 32. On the horizontal axis, the positions of the wiper blades 28 and 30 on the windshield 12 corresponding to the rotation angle of the output shaft 32 are shown in parentheses.

  FIG. 2 shows three curves of a startup speed map C1, a reciprocating wiping operation speed map C2, and a storage operation speed map C3.

  The startup speed map C1 is a speed map used when the wiper motor 18 starts operating from the state where the wiper blades 28 and 30 are stored in the storage position P3. The rotation speed of the output shaft 32 increases as the wiper blades 28 and 30 rotate from the storage position P3 to the upper reversal position P1, and the rotation speed of the output shaft 32 near the intermediate point between the storage position P3 and the upper reversal position P1. Is made up of a substantially semi-elliptical trajectory.

  The reciprocating wiping operation speed map C2 is a speed map used when the wiper blades 28 and 30 reciprocate between the lower reversing position P2 and the upper reversing position P1. As the wiper blades 28 and 30 rotate from the lower inversion position P2 to the upper inversion position P1, the number of rotations of the output shaft 32 increases, and the output shaft 32 of the output shaft 32 is near an intermediate point between the lower inversion position P2 and the upper inversion position P1. It is composed of a substantially semi-elliptical locus that maximizes the rotational speed.

  The reciprocating wiping operation speed map C2 is also used when the wiper blades 28 and 30 are inverted at the upper inversion position P1, that is, when the wiper blades 28 and 30 are returned from the upper inversion position P1 to the lower inversion position P2. In this case, the rotational speed of the output shaft 32 increases as the wiper blades 28 and 30 rotate from the upper inversion position P1 to the lower inversion position P2, and the output is performed near the intermediate point between the upper inversion position P1 and the lower inversion position P2. The rotational speed of the shaft 32 is maximized.

  Note that the maximum rotation speed of the output shaft 32 is the same in the startup speed map C1 and the reciprocating wiping operation speed map C2. The in-vehicle wiper device generally includes a low speed operation mode in which the wiper blades 28 and 30 are rotated at a low speed and a high speed operation mode in which the wiper blades 28 and 30 are rotated at a high speed. You may make it each provide for operation modes and high-speed operation modes.

  When the wiper switch 50 is in the intermittent operation mode selection position, the reciprocating wiping operation speed map C2 is again after a predetermined time of several seconds to 10 seconds after the wiper blades 28 and 30 stop at the lower inversion position P2. Accordingly, the wiper motor 18 may be rotated.

  The storage operation speed map C3 is a speed map used when the wiper switch 50 is switched to the storage (stop) mode selection position while the wiper device is operating.

  While the wiper device is operating, the wiper motor 18 rotates forward and backward according to the reciprocal wiping operation speed map C2, and the wiper blades 28 and 30 reciprocate between the upper reversal position P1 and the lower reversal position P2. Therefore, the storage operation speed map C3 defines the rotation speed of the output shaft from when the wiper blades 28 and 30 return to the lower inversion position P2 to when the wiper blades 28 and 30 rotate from the lower inversion position P2 to the storage position P3.

  The storage operation speed map C3 shows that the rotation speed of the output shaft 32 increases as the wiper blades 28 and 30 rotate from the lower inversion position P2 to the storage position P3, and is near the intermediate point between the lower inversion position P2 and the storage position P3. The output shaft 32 has a substantially semi-elliptical locus that maximizes the rotational speed.

  In the present embodiment, when the wiper switch 50 is switched to the retracted (stopped) mode selection position while the wiper blade is reciprocatingly rotated, the rotation of the wiper motor 18 is the reciprocating wiping operation until the wiper blade reaches the lower inversion position P2. It is controlled according to the speed map C2.

  After the wiper blade reaches the lower reverse position P2, the rotation of the wiper motor 18 is controlled according to the storage operation speed map C3.

  The maximum rotation speed of the output shaft 32 defined by the storage operation speed map C3 is lower than the maximum rotation speed defined by the startup speed map C1 and the reciprocating wiping operation speed map C2. This is because the distance from the lower inversion position P2 to the storage position P3 is short. Therefore, if the rotational speed of the output shaft 32 is increased, the wiper blades 28 and 30 are suddenly accelerated and decelerated on the windshield 12 at the storage position P3. This is because a smooth operation is hindered.

  It is desirable that the wiper blades 28 and 30 are accurately stopped at the upper inversion position P1, the lower inversion position P2, and the storage position P3. However, in actual operation, there is a case where the wiper blades 28 and 30 stop before the upper reversal position P1, the lower reverse position P2 or the retracted position P3 due to friction between the surface of the windshield 12 and the wiper blades 28 and 30. It is done.

  In FIG. 2, in each map, the rotational speed of the wiper motor 18 is gradually reduced so that the rotational speed of the output shaft 32 becomes “0” at the upper reverse position P1, the lower reverse position P2, or the storage position P3. However, in the present embodiment, the wiper blade is within the upper inversion permission range R3, the lower inversion permission range R2 or the stop permission range R1 provided before the upper inversion position P1, the lower inversion position P2, or the storage position P3. 28 and 30 are also allowed to stop.

  In the present embodiment, the upper inversion position P1, the lower inversion position P2, and the storage position P3 are also positions that become the targets at which the wiper blades 28 and 30 are stopped. In actual operation, the wiper blades 28 and 30 may be stopped in a predetermined region where the stop set before the stop target position is allowed.

  In the present embodiment, when the wiper blades 28 and 30 stop in the stop permission range R1, it is considered that the wiper blades 28 and 30 are stored in the storage position P3.

  Further, when the wiper blades 28 and 30 are stopped within the upper inversion permission range R3 or the lower inversion permission range R2, the wiper blades 28 and 30 are allowed to reverse from the stopped position. To do.

  Further, in the present embodiment, the wiper blades 28 and 30 are allowed to move to the storage position P3 from the state where the wiper blades 28 and 30 are stopped in the lower inversion permission range R2.

  FIG. 3 is a modified example of the velocity map of the present embodiment. In FIG. 3, the upper inversion target position P7 is set between the upper inversion position P1 and the upper inversion permission position P6, that is, in the upper inversion permission range R3.

  Further, the startup speed map C1 and the reciprocating wiping operation speed map C2 are defined such that the rotational speed of the output shaft 32 becomes “0” at the upper inversion target position P7.

  In FIG. 3, the upper reversal target position P7 is a target position at which the wiper blades 28 and 30 are stopped. Thus, by controlling the rotation of the wiper motor 18 so that the wiper blades 28 and 30 stop at the upper reverse target position P7, overrun or sudden deceleration of the wiper blades 28 and 30 at the upper reverse position P1 can be prevented. .

  The reciprocating wiping operation speed map C2 indicates that when the wiper blades 28 and 30 are rotated from the upper inversion position P1 to the lower inversion position P2, the lower inversion target provided in the lower inversion permission range R2 before the lower inversion position P2. The rotational speed of the output shaft 32 is defined to be “0” at the position P8.

  The storage operation speed map C3 defines that the rotation speed of the output shaft 32 is “0” at the storage target position P9 provided in the stop permission range R1 before the storage position P3.

  As described above, the stop target positions are defined before the lower inversion position P2 and the storage position P3, and the speed map is defined so that the rotation speed of the output shaft 32 is “0” at these stop targets. To do. As a result, overrun or sudden deceleration of the wiper blades 28 and 30 at the lower inversion position P2 or the storage position P3 can be prevented.

  Subsequently, the control of the present embodiment will be described. FIG. 4 is a flowchart relating to the control of the microcomputer 58 in the present embodiment.

  When the wiper switch 50 is switched from the storage (stop) mode selection position to the low speed operation mode selection position, the high speed operation mode selection position, or the intermittent operation mode selection position, the control shown in FIG. 4 is started.

  First, in step 400, the rotation of the wiper motor 18 is controlled according to the startup speed map C1.

  In step 402, the calculation of the position of the wiper blades 28 and 30 on the windshield 12 is started from the rotation angle of the output shaft 32 detected by the sensor 54. Further, the rotational speed of the output shaft 32 is calculated from the rotational angle of the output shaft 32, and it is monitored whether or not the wiper motor 18 is controlled according to the startup speed map C1.

  In step 404, it is determined whether or not the wiper blades 28 and 30 are stopped in the upper inversion permission range R3. If the determination is affirmative, the procedure proceeds to step 408. If the determination is negative, in step 406, the wiper motor 18 is rotated using the reciprocating wiping operation speed map C2, and the wiper blades 28 and 30 are in the upper reversal permitted range. Stop at R3.

  In step 406, the rotation of the wiper motor 18 is controlled using the reciprocating wiping operation speed map, but the rotation of the wiper motor 18 may be controlled according to the startup speed map C1.

  In step 408, the rotation of the wiper motor 18 is controlled using the reciprocating wiping operation speed map C2 so that the wiper blades 28 and 30 rotate from the upper inversion permission range R3 to the lower inversion permission range R2.

  In step 410, it is determined whether or not the wiper blades 28 and 30 are stopped in the lower inversion permission range R2. If the determination is affirmative, the procedure proceeds to step 414. If the determination is negative, in step 412, the wiper motor 18 is rotated using the reciprocating wiping operation speed map C2, and the wiper blades 28 and 30 are set in the lower inversion allowable range. Stop at R2.

  In step 414, it is determined whether or not the wiper switch 50 has been switched to the storage (stop) mode selection position. In the case of negative determination, in step 416, the rotation of the wiper motor 18 is controlled using the reciprocating wiping operation speed map C2 so that the wiper blades 28 and 30 are rotated from the lower inversion permission range R2 to the upper inversion permission range R3. The procedure returns to step 404.

  If the determination in step 414 is affirmative, in step 418, the rotation of the wiper motor 18 is controlled according to the storage operation speed map C3 so that the wiper blades 28 and 30 rotate from the lower inversion permission range R2 to the stop permission range R1.

  In step 420, it is determined whether or not the wiper blades 28 and 30 are stopped in the stop permission range R1. If the determination is affirmative, the process ends. If the determination is negative, in step 422, the wiper motor 18 is rotated using the storage operation speed map C3, and the wiper blades 28 and 30 are stopped in the stop permission range R1, The process ends.

  As described above, according to the present embodiment, an area for allowing the wiper blade to stop before the stop position and an area for allowing the wiper blade to reverse are provided before the inversion position, respectively. The blade can be stopped and reversed. Accordingly, it is possible to prevent overrun of the wiper blade at the stop position or the reverse position, and it is possible to prevent abnormal noise caused by sudden deceleration of the wiper blade at the stop position or the reverse position.

  In the present embodiment, when the wiper switch 50 is turned off, the rotation of the wiper motor 18 is controlled by the reciprocating wiping operation speed map C2 up to the lower inversion position P2, and the storage operation speed map C3 from the lower inversion position P2. Thus, the rotation of the wiper motor 18 was controlled.

  However, when the wiper switch 50 is turned off, the wiper motor 18 may be switched from the reciprocating wiping operation speed map C2 to the control based on the startup speed map C1.

  In this case, the control of the wiper motor 18 is switched from the reciprocating wiping operation speed map C2 shown in FIG. 2 to the one using the startup speed map C1, and the rotational speed of the wiper motor 18 as the wiper blades 28 and 30 approach the storage position P3. Decelerate.

  By controlling in this way, the wiper blades 28 and 30 can be stopped at the storage position P3 without temporarily stopping the wiper blades 28 and 30 at the lower inversion position P2. For example, the rotation speed of the wiper motor 18 is decelerated as the wiper blades 28 and 30 approach the storage position P3 from the vicinity of the intermediate point of the reciprocating rotation process, and the wiper blades 28 and 30 are stopped at the storage position P3 or the stop permission range R1. .

DESCRIPTION OF SYMBOLS 10 ... Wiper apparatus, 12 ... Windshield, 14 ... 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 ... Wiper switch, 52 ... Deceleration mechanism, 54 ... Sensor, 56 ... Drive circuit, 58 ... Microcomputer, 60 ... Memory, C1 ... speed map at startup, C2 ... reciprocating wiping operation speed map, C3 ... storage operation speed map, P1 ... upper inversion position, P2 ... lower inversion position, P3 ... storage position, P4 ..Stop permission position, P5... Lower inversion permission position, P6... Upper inversion permission position, P7... Upper inversion target position, P8. R1 ... Stop permissible range, R2 ... Lower reversal permitted range, R3 ... Upper reversal permitted range

Claims (3)

A wiper motor that reciprocally rotates on a window glass a wiper blade that is forwardly and reversely rotated at a predetermined rotation angle and connected via a wiper arm;
Each of the upper and lower predetermined positions of the area where the wiper blade reciprocates on the window glass is stored as a stop target position that is the position where the wiper blade should stop, and is the upper stop target position . A stop permission range in which the wiper blade can stop a predetermined range on the lower side on the window glass from the upper reversal position and a predetermined range on the upper side on the window glass from the lower reverse position which is the lower stop target position. And storing a speed map that defines a rotation speed of the wiper motor with respect to a rotation angle of the wiper motor when the wiper blade rotates between the upper stop target position and the lower stop target position. Storage means;
Detection means for detecting the rotation speed and rotation angle of the wiper motor;
The wiper blade that refers to the storage means, identifies the position of the wiper blade on the window glass based on the rotation angle of the wiper motor detected by the detection means, and is reciprocally rotated based on the speed map Decreases the rotational speed of the wiper motor as it approaches each of the stop permission ranges, stops the wiper motor rotation when the wiper blade stops within the stop permission range , and the wiper blade moves within the stop permission range . Control that stops rotation of the wiper motor within the stop permission range by controlling the rotation of the wiper motor so that the rotation speed of the speed map corresponding to the rotation angle detected by the detection means is not stopped. Means,
Wiper device having   The control means reduces the rotational speed of the wiper motor based on the speed map as the rotating wiper blade approaches each stop target position from near an intermediate point of the reciprocating rotation stroke, When the blade stops within the stop permission range, the rotation of the wiper motor is stopped, and after the stop, the wiper motor is rotated in the direction opposite to that immediately before the stop to rotate the wiper blade stopped within the stop permission range. The wiper device according to claim 1. A wiper switch for inputting a command for operating or stopping the wiper motor;
The storage means is a lower reversal position where the wiper blade stops when the wiper blade is reversed during the reciprocating rotation, and a storage position where the wiper blade is stored below the lower reversal position as the lower stop target position. And a predetermined range on the upper side of the window glass from the lower inversion position and a predetermined range on the upper side of the window glass from the storage position as a stop permission range in which the wiper blade can stop. Each storing and storing a storage speed map in which the rotation speed of the wiper motor relative to the rotation angle of the wiper motor when the wiper blade rotates from the lower reverse position to the storage position is lower than the speed map;
When the wiper blade receives a command to stop the wiper motor from the wiper switch during the reciprocating rotation of the wiper blade, the control means is configured to move the wiper blade closer to the lower inversion position based on the speed map. After the rotational speed of the wiper motor is decelerated and the wiper blade stops within the stop permission range including the lower reverse position, the wiper motor is rotated at a speed lower than the reciprocating rotation based on the retracted speed map, and the wiper The rotation speed of the wiper motor is decelerated as the blade approaches the retracted position, and when the wiper blade stops within a stop permission range including the retracted position, the rotation of the wiper motor is stopped. Wiper device.

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