JP2009001070A - Wiper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable adequate variable control of an upper reverse position without using a vehicle speed signal from a vehicle speed sensor. <P>SOLUTION: In this wiper device 10, the upper reverse position P2 is displaced depending on a current value ratio Ra (=I1/I2) of a first driving current I1 which flows in a wiper motor 12 when a wiper 26 is turned from a lower reverse position P1 to the upper reverse position P2, to a second driving current I2 which flows in the wiper motor 12 when the wiper 26 is turned from the upper reverse position P2 to the lower reverse position P1. The current value ratio Ra is changed depending on not only travelling wind but also natural opposing or following wind, and so the upper reverse position P2 is changed depending on the current value ratio Ra to permit adequate variable control of the upper reverse position P2 while considering the influences of not only wind depending on a vehicle speed but also natural opposing or following wind. In addition, the current value ratio Ra is used instead of the vehicle speed signal from the vehicle speed sensor for actualizing the variable control of the upper reverse position P2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wiper device, and more particularly to a wiper device configured to displace an upper reversal position of a wiper that is reciprocally rotated between a lower reversal position and an upper reversal position.

  In a wiper device that wipes the windshield of a vehicle, for example, when the vehicle winds at high speed, if the wind force acts on the wiper in addition to the driving force of the wiper motor, the wiper is turned upside down from the downturned position. When rotating to a position, the wiper may interfere with the A-pillar of the vehicle beyond a predetermined upper reversal position. In order to prevent this, it is conceivable that the upper reversal position of the wiper is set in advance to the lower reversal position side so that the wiper does not interfere with the A pillar. However, in this case, there is a problem that the normal wiping range of the wiper becomes narrow.

  Therefore, in the example described in Patent Document 1, a vehicle speed signal is detected by a vehicle speed sensor and this signal is input to the control circuit, and the upper reversing position of the wiper is displaced according to the vehicle speed. As a result, it is possible to perform a wiping operation so that the wiper does not interfere with the A-pillar even during high-speed traveling while ensuring a sufficiently large wiper wiping range during normal traveling.

  However, the wiper device described in Patent Document 1 needs to detect a vehicle speed signal and input it to the control circuit. For this reason, it is necessary to route a signal line from the vehicle speed sensor to the control circuit. In particular, when a control circuit for controlling the wiper motor is provided integrally with the wiper motor, in addition to a power supply line from a power supply line such as a battery and a signal line from a wiper operation switch, a signal from a vehicle speed sensor is also provided. More wires, such as lines, are connected to the control circuit.

Further, not only winds depending on the vehicle speed but also natural headwinds and tailwinds may act on the wiper. Therefore, in the variable control of the upper reversal position based on the vehicle speed signal, it is difficult to appropriately control the upper reversal position in consideration of the effects of natural headwinds and tailwinds.
Special table 2003-533400 gazette

  The present invention has been made in view of the above circumstances, and an object of the present invention is to perform variable control of the upper inversion position without using a vehicle speed signal from a vehicle speed sensor. It is an object of the present invention to provide a wiper device capable of performing appropriate variable control of the reversal position in consideration of not only the influence but also the influence of natural headwinds and tailwinds.

  In order to solve the above-mentioned problem, the wiper device according to claim 1 wipes the wiping surface by being reciprocally rotated between a lower reversing position and an upper reversing position in response to a driving force of the wiper motor and the wiper motor. A wiper, a first drive current flowing through the wiper motor when the wiper is rotated from the lower reverse position to the upper reverse position, and when the wiper is rotated from the upper reverse position to the lower reverse position A wiper device comprising: an upper inversion position displacing means for displacing the upper inversion position in accordance with a current value ratio with a second drive current flowing through the wiper motor.

  In the wiper device according to the first aspect, when the wiper motor is operated, the wiper is reciprocated between the lower reverse position and the upper reverse position by the driving force of the wiper motor, and the wiping surface is wiped off. Further, the upper inversion position of the wiper is displaced by the upper inversion position displacement means.

  Here, the upper reversal position displacing means is the first drive current that flows to the wiper motor when the wiper is rotated from the lower reverse position to the upper reverse position, and when the wiper is rotated from the upper reverse position to the lower reverse position. The upper inversion position is displaced according to the ratio of the current value with the second drive current flowing through the wiper motor.

  By the way, the first drive current and the second drive current in the wiper motor change according to the motor load acting on the wiper motor through the wiper when the wiper reciprocates. For example, if the wind is applied to the wiper when the wiper is reciprocally rotated, the motor load acting on the wiper motor is reduced when the wiper is rotated from the lower reverse position to the upper reverse position. At this time, the first drive current decreases, and when the wiper is rotated from the upper reversal position to the lower reversal position, the operation reverses to the wind direction, so the motor load acting on the wiper motor due to the wind resistance increases. At this time, the second drive current increases.

  The first drive current and the second drive current in the wiper motor are not only used when the above-described traveling wind, that is, the wind depending on the vehicle speed, acts on the wiper, but also when the natural headwind or tailwind acts on the wiper. Each changes. Therefore, by displacing the upper reversal position according to the current value ratio between the first drive current and the second drive current in the wiper motor, not only the influence of the wind depending on the vehicle speed but also the influence of the natural headwind and tailwind Thus, appropriate variable control of the upper reversal position becomes possible.

  In addition, by using the current value ratio between the first drive current and the second drive current in the wiper motor, it is possible to perform variable control of the upper reversal position without using the vehicle speed signal from the vehicle speed sensor.

  Thus, according to the wiper device of the first aspect, it is possible to perform the variable control of the upper inversion position without using the vehicle speed signal from the vehicle speed sensor, and not only the influence of the wind depending on the vehicle speed. In addition, it is possible to perform appropriate variable control of the reversing position in consideration of the effects of natural headwinds and tailwinds.

  The wiper device according to a second aspect is the wiper device according to the first aspect, wherein the upper reversal position displacing means is configured such that the upper drive position displacement means decreases the current value ratio of the first drive current with respect to the second drive current. The amount of displacement of the reversal position toward the lower reversal position is continuously increased.

  According to the wiper device of the second aspect, for example, when the driving wind is strengthened as the vehicle travels at high speed or when a natural head wind hits the vehicle during driving, the first drive current decreases, Since the two drive currents increase, as a result, the current value ratio of the first drive current to the second drive current decreases. As the current value ratio decreases, the amount of displacement of the upper inversion position toward the lower inversion position is continuously increased (that is, the wiper wiping angle is continuously decreased). Therefore, even when a traveling wind or a natural headwind is applied, the wiper can be prevented from interfering with the vehicle body or the like beyond the initial upper reversal position.

  According to a third aspect of the present invention, in the wiper device according to the first aspect, the upper inversion position displacing means includes a reference value in which a current value ratio of the first drive current to the second drive current is predetermined. In the following cases, the upper reversal position is displaced to the lower reversal position side.

  According to the wiper device of the third aspect, for example, when the driving wind is strengthened as the vehicle travels at high speed, or when a natural head wind is hit when the vehicle travels, the first drive current decreases, Since the two drive currents increase, as a result, the current value ratio of the first drive current to the second drive current decreases. When the current value ratio becomes equal to or less than a predetermined reference value, the upper reversal position is displaced toward the lower reversal position (that is, the wiper wiping angle is reduced). Therefore, even when a traveling wind or a natural headwind is applied, the wiper can be prevented from interfering with the vehicle body or the like beyond the initial upper reversal position.

  The wiper device according to a fourth aspect of the present invention is the wiper device according to the third aspect, wherein the upper inversion position displacing means has a plurality of the reference values stepwise, and the first driving current with respect to the second driving current. Each time the current value ratio becomes equal to or less than the reference value, the upper inversion position is displaced toward the lower inversion position.

  According to the wiper device of the fourth aspect, each time the current value ratio of the first drive current to the second drive current becomes equal to or less than each reference value, the upper inversion position is displaced to the lower inversion position side. It is possible to perform variable control of the more detailed upper inversion position (that is, the wiper wiping angle).

  The wiper device according to claim 5 is the wiper device according to any one of claims 1 to 4, wherein the upper inversion position displacing means is a current of the first drive current with respect to the second drive current. The upper inversion position is displaced to the initial position side in accordance with an increase in value ratio.

  According to the wiper device of the fifth aspect, for example, when the driving wind is weakened due to a decrease in the vehicle speed or when a natural tailwind hits the vehicle while driving, the first drive current increases and the second driving current increases. Since the drive current decreases, the current value ratio of the first drive current to the second drive current increases as a result. As the current value ratio increases, the upper inversion position is displaced toward the initial position (that is, the wiper wiping angle is increased). Thereby, a large wiper wiping range can be secured.

  In order to solve the above-mentioned problem, the wiper device according to claim 6 is configured such that the wiper motor and the wiper motor are driven to reciprocate between a lower reversal position and an upper reversal position by receiving the driving force of the wiper motor. A wiper to be wiped, and an upper inversion that displaces the upper inversion position in accordance with a current value decrease rate with respect to a reference current of a drive current flowing in the wiper motor when the wiper is rotated from the lower inversion position to the upper inversion position And a position displacement means.

  In the wiper device according to the sixth aspect, when the wiper motor is operated, the wiper motor receives the driving force of the wiper motor to reciprocate between the lower inversion position and the upper inversion position, thereby wiping the wiping surface. Further, the upper inversion position of the wiper is displaced by the upper inversion position displacement means.

  Here, the upper inversion position displacing means displaces the upper inversion position in accordance with the current value decrease rate with respect to the reference current of the drive current flowing through the wiper motor when the wiper is rotated from the lower inversion position to the upper inversion position.

  By the way, the drive current flowing through the wiper motor changes according to the motor load acting on the wiper motor through the wiper when the wiper is rotated from the lower reverse position to the upper reverse position. For example, if the driving wind force is applied to the wiper from the lower reverse position to the upper reverse position when the wiper is rotated from the lower reverse position, the motor load acting on the wiper motor is reduced. Decrease.

  The drive current flowing through the wiper motor changes not only when the above-described traveling wind, that is, the wind depending on the vehicle speed, acts on the wiper, but also when a natural headwind or tailwind acts on the wiper. Therefore, by displacing the upper reversal position according to the current value reduction rate of the drive current flowing through the wiper motor with respect to the reference current, the reversal takes into account not only the effect of wind depending on the vehicle speed but also the effect of natural headwinds and tailwinds. Appropriate variable control of the position becomes possible.

  In addition, by using the current value reduction rate of the drive current flowing through the wiper motor with respect to the reference current, it is possible to perform variable control of the upper inversion position without using the vehicle speed signal from the vehicle speed sensor.

  Thus, according to the wiper device of the sixth aspect, it is possible to perform the variable control of the upper inversion position without using the vehicle speed signal from the vehicle speed sensor, and not only the influence of the wind depending on the vehicle speed. In addition, it is possible to perform appropriate variable control of the reversing position in consideration of the effects of natural headwinds and tailwinds.

  The wiper device according to a seventh aspect is the wiper device according to the sixth aspect, wherein the upper inversion position displacing means is configured to increase the current value decrease rate of the drive current with respect to the reference current. The amount of displacement toward the lower inversion position is continuously increased.

  According to the wiper device of the seventh aspect, for example, when the driving wind becomes stronger as the vehicle travels at a high speed or when a natural head wind hits the vehicle while driving, the driving current decreases, resulting in driving. The current value decrease rate with respect to the reference current increases. As the current value reduction rate increases, the amount of displacement of the upper inversion position toward the lower inversion position is continuously increased (that is, the wiper wiping angle is decreased). Therefore, even when a traveling wind or a natural headwind is applied, the wiper can be prevented from interfering with the vehicle body or the like beyond the initial upper reversal position.

  The wiper device according to an eighth aspect is the wiper device according to the sixth aspect, wherein the upper inversion position displacing means has a current value reduction rate of the drive current with respect to the reference current equal to or greater than a predetermined reference value. In this case, the upper inversion position is displaced toward the lower inversion position.

  According to the wiper device of the eighth aspect, for example, when the traveling wind becomes stronger as the vehicle travels at a high speed or when a natural head wind hits when the vehicle travels, the driving current decreases, resulting in driving. The current value decrease rate with respect to the reference current increases. When the current value decrease rate of the drive current with respect to the reference current becomes equal to or greater than a predetermined reference value, the upper inversion position is displaced to the lower inversion position (that is, the wiper wiping angle is reduced). ). Therefore, even when a traveling wind or a natural headwind is applied, the wiper can be prevented from interfering with the vehicle body or the like beyond the initial upper reversal position.

  The wiper device according to claim 9 is the wiper device according to claim 8, wherein the upper inversion position displacing means has a plurality of the reference values in a stepwise manner, and the current value of the drive current decreases with respect to the reference current. The upper reversal position is displaced toward the lower reversal position each time the rate becomes equal to or higher than each reference value.

  According to the wiper device of the ninth aspect, the upper inversion position is displaced toward the lower inversion position each time the current value decrease rate of the drive current with respect to the reference current becomes equal to or more than each reference value, so that the determination is more precise. Further, the variable control of the upper reversal position (that is, the wiper wiping angle) can be performed.

  The wiper device according to a tenth aspect is the wiper device according to any one of the sixth to ninth aspects, wherein the upper inversion position displacing means is configured to reduce a current value reduction rate of the drive current with respect to the reference current. The upper inversion position is displaced to the initial position side according to the decrease.

  According to the wiper device of the tenth aspect, for example, when the driving wind is weakened due to a decrease in the vehicle speed or when a natural tailwind is hit when the vehicle travels, the driving current increases, and as a result, the driving current The current value decrease rate with respect to the reference current decreases. Then, the upper inversion position is displaced to the initial position side in accordance with the decrease in the current value decrease rate (that is, the wiper wiping angle is increased). Thereby, a large wiper wiping range can be secured.

  The wiper device according to claim 11 is the wiper device according to any one of claims 1 to 10, wherein the wiper is turned upside down when the wiper motor is switched from forward rotation to reverse rotation. The upper reversing position displacing means is displaced at a position, and the upper reversing position is displaced by changing a switching position of the wiper motor from forward rotation to reverse rotation.

  According to the wiper device of the eleventh aspect, the upper reversal position is displaced by changing the switching position of the wiper motor from the normal rotation to the reverse rotation. Therefore, a dedicated motor mechanism or the like for displacing the upper reversal position is provided. The entire apparatus can be reduced in size without being required.

[First embodiment]
First, a first embodiment of the present invention will be described.

  FIG. 1 shows an overall configuration of a wiper device 10 according to the first embodiment of the present invention, and FIG. 2 shows a block diagram of an internal configuration of a wiper motor 12 provided in the wiper device 10. Has been. The wiper device 10 according to the first embodiment of the present invention shown in FIG. 1 is suitably used for wiping the windshield 100 of a vehicle such as a passenger car, for example. The wiper motor 12 is provided.

  One end of a crank arm 16 is fixed to the output shaft 14 of the wiper motor 12, and one end of a connecting rod 18 is rotatably connected to the other end of the crank arm 16. One end of a pivot lever 20 is rotatably connected to the other end of the connecting rod 18, and the other end of the pivot lever 20 is fixed to a pivot shaft 24 that is rotatably supported by a pivot holder 22. ing. The base end side of the wiper 26 is fixed to the pivot shaft 24.

  As shown in FIG. 2, the wiper motor 12 is integrally provided with a current detector 28, a rotational position detector 30, a motor body 32, and a control circuit 34. The current detector 28 is constituted by, for example, a shunt resistor, detects a drive current flowing in a winding provided in a motor body 32 (armature) described later, and outputs a signal corresponding to the detected drive current to the control circuit 34. Output.

  The rotational position detector 30 includes, for example, a cam plate integrated with a gear of a speed reduction mechanism provided in the wiper motor 12, a contact terminal that is slidably contacted with the cam plate, and the like according to the rotational position of the gear. The signal is output to the control circuit 34. The motor body 32 is, for example, an armature provided with a winding or the like, and is rotated when a drive current from the control circuit 34 flows through the winding. The output shaft shown in FIG. 14 is configured to rotate.

  The control circuit 34 includes, for example, an ECU, and is configured to control the rotation of the motor main body 32 based on the signals output from the current detector 28 and the rotational position detector 30 described above.

  And in the wiper apparatus 10 which consists of said each structure, the wiper 26 is wiped off as follows.

  That is, the control circuit 34 rotates the motor main body 32 in the forward direction when receiving an activation signal from a wiper operation switch (not shown). As a result, the crank arm 16 is rotated in the forward direction (R1 direction) together with the output shaft 14 of the wiper motor 12 shown in FIG. 1, and the wiper 26 is inverted upward from the lower inversion position P1 via the connecting rod 18 and the pivot lever 20. It is rotated to position P2.

  Further, when the control circuit 34 determines from the signal output from the rotational position detector 30 that the wiper 26 has reached the upper reversal position P2, the motor circuit 32 rotates in the reverse direction. As a result, the crank arm 16 is rotated in the reverse direction (R2 direction) together with the output shaft 14 of the wiper motor 12, and the wiper 26 is reversed to be rotated from the upper reverse position P2 to the lower reverse position P1.

  The control circuit 34 reverses the motor main body 32 every time the wiper 26 reaches the upper reverse position P2 and the lower reverse position P1, so that the wiper 26 moves between the lower reverse position P1 and the upper reverse position P2. The windshield 100 is wiped by reciprocating rotation.

  Further, in the wiper device 10, when the wiper 26 is wiped as described above, the upper inversion position P2 is displaced as follows.

  That is, the control circuit 34 inputs the signal output from the current detector 28 when the wiper 26 is rotated from the lower inversion position P1 to the upper inversion position P2 as described above, and the winding provided in the motor main body 32. The first driving current I1 flowing through the line is detected, and the signal output from the current detector 28 when the wiper 26 is rotated from the upper inversion position P2 to the lower inversion position P1 as described above is input. The second drive current I2 flowing in the windings provided in 32 is detected.

  Then, the control circuit 34 calculates the current value ratio Ra of the first drive current I1 with respect to the second drive current I2 (that is, the current value ratio Ra = I1 / I2), and determines that the current value ratio Ra has decreased. In this case, the switching position where the motor main body 32 is rotated in the reverse direction from the normal rotation is changed (that is, the switching timing is advanced), and the current value ratio Ra decreases to the lower inversion position P1 side as the current value ratio Ra decreases. The displacement amount α is continuously increased (that is, the wiping angle θ of the wiper 26 is continuously decreased; see FIG. 3A). In FIG. 1, the symbol P2 indicates the initial position of the upper inversion position, and the symbol P2 'indicates the position after displacement of the upper inversion position.

  Further, when the control circuit 34 determines that the current value ratio Ra has increased, the control position is changed (that is, the switching timing is delayed) to reversely rotate the motor main body 32 from the forward rotation, and the current value ratio Ra. With the increase, the displacement amount α toward the lower inversion position P1 on the upper inversion position P2 is continuously decreased (that is, the wiping angle θ of the wiper 26 is continuously increased; see FIG. 3A).

  By the way, the first drive current I1 and the second drive current I2 in the wiper motor 12 change according to the motor load acting on the wiper motor 12 through the wiper 26 when the wiper 26 reciprocates. Here, FIGS. 4A to 4E illustrate patterns in which the first drive current I1 and the second drive current I2 in the wiper motor 12 change according to the motor load acting on the wiper motor 12, respectively.

  For example, when the vehicle is stopped, the wiping load acting on the wiper 26 is substantially different when the wiper 26 rotates from the lower inversion position P1 to the upper inversion position P2 and when the wiper 26 rotates from the upper inversion position P2 to the lower inversion position P1. The same is true. Therefore, in this case, for example, as shown in FIG. 4A, the first drive current I1 and the second drive current I2 in the wiper motor 12 have substantially the same current value.

  On the other hand, for example, when the vehicle travels at a normal speed, the force of traveling wind acts on the wiper 26 toward the upper reversal position P2. Therefore, when the wiper 26 is rotated from the lower inversion position P1 to the upper inversion position P2, the motor load acting on the wiper motor 12 is reduced, and when the wiper 26 is rotated from the upper inversion position P2 to the lower inversion position P1, the wiper motor. The motor load acting on 12 increases. Therefore, in this case, for example, as shown in FIG. 4B, the first drive current I1 decreases and the second drive current I2 increases as compared to when the vehicle is stopped.

  Further, for example, when traveling at a high speed higher than the normal speed of the vehicle, a stronger traveling wind force acts on the wiper 26 toward the upper reversal position P2. Therefore, when the wiper 26 is rotated from the lower inversion position P1 to the upper inversion position P2, the motor load acting on the wiper motor 12 is further reduced, and when the wiper 26 is rotated from the upper inversion position P2 to the lower inversion position P1. The motor load acting on the wiper motor 12 further increases. Therefore, in this case, for example, as shown in FIG. 4C, the first drive current I1 is further reduced and the second drive current I2 is smaller than that when the vehicle is traveling at the normal speed. Increases further.

  Further, for example, when a natural head wind hits the vehicle at a normal speed, a natural head wind force acts on the wiper 26 in addition to the driving wind force toward the upper reversal position P2. Therefore, in this case, for example, as shown in FIG. 4 (D), compared to the case where there is no natural headwind when the vehicle is traveling at the normal speed (see FIG. 4 (B)), The first drive current I1 decreases and the second drive current I2 increases.

  On the other hand, for example, when a natural tailwind hits the vehicle at a normal speed, the driving wind force acting on the wiper 26 toward the upper reversal position P2 and the natural tailwind acting on the lower reversal position P1 are generated. The forces cancel each other. Therefore, in this case, for example, as shown in FIG. 4 (E), as compared with the case where there is no natural headwind (see FIG. 4 (B)) when the vehicle is traveling at the normal speed, The first drive current I1 increases and the second drive current I2 decreases.

  As described above, the first driving current I1 and the second driving current I2 in the wiper motor 12 are not limited to the case where the traveling wind accompanying the traveling of the vehicle, that is, the wind depending on the vehicle speed acts on the wiper 26, but also the natural headwind and tailwind This also changes when the wiper 26 acts on the wiper 26.

  Then, the control circuit 34 continuously increases or decreases the displacement α to the lower inversion position P1 side of the upper inversion position P2 as the current value ratio Ra of the first driving current I1 to the second driving current I2 increases. (That is, the wiping angle θ of the wiper 26 is continuously decreased; see FIG. 3A).

  For example, when the speed of the vehicle gradually increases, the first driving current I1 decreases and the second driving current increases as the traveling wind force acting on the wiper 26 toward the upper reversal position P2 increases. I2 increases and the current value ratio Ra decreases (see FIG. 5). Therefore, in this case, in order to prevent interference between the wiper 26 and the A pillar 102, the control circuit 34 continuously applies the displacement amount α toward the lower inversion position P1 side in the upper inversion position P2 as the current value ratio Ra decreases. (That is, the wiping angle θ of the wiper 26 is continuously decreased; see FIG. 3A).

  Also, for example, when a natural headwind is hit when the vehicle is traveling at a normal speed, the first driving current I1 decreases and the second driving current I2 increases as the natural headwind force increases. The current value ratio Ra decreases. Accordingly, also in this case, the control circuit 34 has a displacement amount α toward the lower inversion position P1 on the upper inversion position P2 as the current value ratio Ra decreases in order to prevent interference between the wiper 26 and the A pillar 102. Is continuously increased (that is, the wiping angle θ of the wiper 26 is continuously decreased; see FIG. 3A).

  On the other hand, for example, when a natural tailwind hits when the vehicle travels at a normal speed, the first driving current I1 increases and the second driving current I2 decreases as the natural tailwind force increases. The current value ratio Ra increases. Accordingly, in this case, the control circuit 34 continuously decreases the displacement amount α toward the lower inversion position P1 side of the upper inversion position P2 as the current value ratio Ra increases in order to ensure the wiping range of the wiper 26. (That is, the wiping angle θ of the wiper 26 is continuously increased; see FIG. 3A).

  As described above, in the wiper device 10 according to the first embodiment of the present invention, the upper inversion position P2 is displaced according to the current value ratio Ra between the first drive current I1 and the second drive current I2 in the wiper motor 12. In addition, appropriate variable control of the inversion position P2 is executed in consideration of not only the influence of the wind depending on the vehicle speed but also the influence of natural headwinds and tailwinds.

  And according to wiper device 10 concerning a first embodiment of the present invention, the following operation and effect are produced.

  That is, according to the wiper device 10 according to the first embodiment of the present invention, as described above, the upper inversion position P2 according to the current value ratio Ra between the first drive current I1 and the second drive current I2 in the wiper motor 12. By displacing, it is possible to perform appropriate variable control of the upper reversal position P2 in consideration of not only the influence of the wind depending on the vehicle speed but also the influence of natural headwinds and tailwinds.

  In addition, by using the current value ratio Ra between the first drive current I1 and the second drive current I2 in the wiper motor 12, it is possible to perform variable control of the upper inversion position P2 without using the vehicle speed signal from the vehicle speed sensor. Become.

  As described above, according to the wiper device 10 according to the first embodiment of the present invention, the upper inversion position P2 can be variably controlled without using the vehicle speed signal from the vehicle speed sensor, and the wind speed depending on the vehicle speed can be controlled. In addition to the influence of the above, it is possible to perform an appropriate variable control of the inversion position P2 in consideration of the influence of natural headwinds and tailwinds.

  Further, according to the wiper device 10 according to the first embodiment of the present invention, for example, when the traveling wind is strengthened as the vehicle travels at high speed, or when a natural head wind hits the vehicle while traveling, the current value ratio As Ra decreases, the displacement amount α toward the lower inversion position P1 on the upper inversion position P2 is continuously increased (that is, the wiping angle θ of the wiper 26 is continuously decreased). Therefore, even if the wiper 26 receives the force of traveling wind or natural headwind and exceeds the upper reversal position P2, the displacement amount α toward the lower reversal position P1 side of the upper reversal position P2 is continuously increased. As a result, the gap dimension A between the wiper 26 and the A pillar 102 is kept substantially constant (see FIG. 3B), and interference between the wiper 26 and the A pillar 102 of the vehicle can be prevented.

  Further, according to the wiper device 10 according to the first embodiment of the present invention, for example, when the traveling wind is weakened due to a decrease in the vehicle speed or when a natural tailwind hits the vehicle while traveling, the current value ratio Ra With the increase, the displacement α to the lower inversion position P1 side of the upper inversion position P2 is continuously decreased (that is, the wiping angle θ of the wiper 26 is continuously increased). As a result, a large wiping range of the wiper 26 can be secured, and the driver's field of view can be secured.

  Further, according to the wiper device 10 according to the first embodiment of the present invention, the upper reversal position P2 is displaced by changing the switching position of the wiper motor 12 from forward rotation to reverse rotation. A dedicated motor mechanism or the like is not required, and the entire apparatus can be reduced in size.

  In addition, according to the wiper device 10 according to the first embodiment of the present invention, the control circuit 34 is integrally mounted inside the wiper motor 12, and the current detector 28 that is output according to the drive current of the wiper motor 12. Can be easily taken into the control circuit 34 by internal wiring.

  6A shows an analysis result of the current value ratio Ra and the vehicle speed V when the wiper 26 is reciprocally rotated continuously and intermittently during rainy high-speed driving. FIG. B) shows an analysis result of the current value ratio Ra and the vehicle speed V when the wiper 26 is continuously and intermittently reciprocated during non-rainy high speed traveling.

  As shown in this figure, it can be seen that the current value ratio Ra decreases as the vehicle speed V increases, regardless of whether the rainy and non-rainy weather or the wiper 26 is continuously and intermittently reciprocated. . Therefore, according to the wiper device 10 according to the first embodiment of the present invention, the upper inversion position P2 is stably set regardless of whether the rainy and non-rainy weather or the wiper 26 is reciprocally rotated continuously and intermittently. Can be displaced.

  As mentioned above, although 1st embodiment of this invention was described, this invention is not limited above, Of course, it can change and implement variously in the range which does not deviate from the main point. is there.

  For example, in the above-described embodiment, the displacement amount α toward the lower inversion position P1 side of the upper inversion position P2 is continuously increased or decreased as the current value ratio Ra increases (FIG. 3 ( A)), and may be configured as follows.

  That is, when the control circuit 34 determines that the current value ratio Ra is equal to or smaller than a predetermined reference value ta, the upper inversion position P2 is displaced to the lower inversion position P1 side to decrease the wiping angle θ, and the current value When it is determined that the ratio Ra exceeds the reference value ta, the upper inversion position P2 may be returned to the initial position to increase the wiping angle θ (see FIG. 7A).

  Even in such a configuration, similarly to the above-described embodiment, it is possible to perform appropriate variable control of the inversion position P2 in consideration of not only the influence of wind depending on the vehicle speed but also the influence of natural headwinds and tailwinds. it can. Further, for example, when the traveling wind becomes stronger as the vehicle speed increases, the gap dimension A between the wiper 26 and the A pillar 102 is secured (FIG. 7B), so the wiper 26 and the A pillar 102 of the vehicle are secured. Interference with can be prevented. Furthermore, for example, when the traveling wind weakens as the vehicle speed decreases, the wiping range of the wiper 26 can be secured large, and the driver's field of view can be secured.

  Further, in this case, a plurality of reference values ta1 and ta2 are set stepwise in the control circuit 34, and every time it is determined by the control circuit 34 that the current value ratio Ra is equal to or less than each reference value ta1 and ta2, The position P2 is displaced to the lower inversion position P1 side to decrease the wiping angle θ, and the upper inversion position P2 is displaced to the initial position side every time it is determined that the current value ratio Ra exceeds the reference values ta1 and ta2. It may be configured to increase the wiping angle θ (see FIG. 8A).

  With such a configuration, the variable control of the upper inversion position P2 (that is, the wiping angle θ of the wiper 26) can be performed more finely than when the single reference value ta is set as described above. (See FIG. 8B). In this case, if more reference values are set in stages, variable control of the upper inversion position P2 can be made more finely.

  In the above embodiment, the upper reversal position P2 is displaced by changing the switching position of the wiper motor 12 from forward rotation to reverse rotation. However, the wiper motor 12 may be configured as follows. .

  That is, for example, as shown in FIG. 9, the forward and backward movement of the crank arm 48 in which the connecting portion 44 of the pair of link arms 40, 42 provided between the connecting rod 18 and the crank arm 16 is connected to the actuator 46. The pitch (both ends length) of the pair of link arms 40, 42 may be displaced by the displacement, and the upper inversion position P2 may be displaced accordingly. In this modification, the pair of link arms 40 and 42, the actuator 46, and the crank arm 48 constitute the upper reverse position displacement means in the present invention.

  By the way, in this modification, the wiper 26 may be reciprocally rotated with the forward / reverse reversing operation of the wiper motor 12, or may be reciprocally rotated with the rotation of the wiper motor 12 in one direction. Further, in this modification, instead of the crank arm 16, an eccentric gear rotated by the actuator 46 is used to displace the connecting portion 44 of the pair of link arms 40, 42 so that the pitch of the pair of link arms 40, 42 is changed. You may be comprised so that (both end length) may be displaced.

  Further, in the above embodiment, the control circuit 34 calculates the current value ratio Ra of the first drive current I1 with respect to the second drive current I2, and the upper inversion position P2 (that is, according to the determination result of the increase / decrease of the current value ratio Ra) Although the wiping angle θ) of the wiper 26 is configured to be displaced, the wiper 26 may be configured as follows.

  That is, the control circuit 34 is configured to calculate a current value ratio of the second drive current I2 to the first drive current I1, and to displace the upper inversion position P2 in accordance with the determination result of the decrease in the current value ratio. May be. Further, the control circuit 34 is configured to calculate a current value difference between the first drive current I1 and the second drive current I2, and to displace the upper inversion position P2 in accordance with a determination result of increase / decrease of the current value difference. May be.

  That is, in the present invention, when the upper inversion position P2 is displaced according to the current value ratio of the second drive current I2 to the first drive current I1 as described above, or between the first drive current I1 and the second drive current I2. This is substantially the same as the case where the upper inversion position P2 is displaced according to the current value ratio Ra of the first drive current I1 to the second drive current I2 as in the case where the upper inversion position P2 is displaced according to the current value difference. This also includes the contents of

  In the above embodiment, the upper inversion position P2 is displaced for one wiper 26. However, as shown in FIG. 9, the upper inversion position P2 is displaced for a pair of wipers 26. Of course it is good.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  In the wiper device 60 (see FIG. 1) according to the second embodiment of the present invention, the operation of the control circuit 34 is displaced with respect to the wiper device 10 according to the first embodiment of the present invention described above. The appearance configuration of the wiper device 60 according to the second embodiment of the present invention is the same as that of the wiper device 10 according to the first embodiment of the present invention described above. Therefore, in the second embodiment of the present invention, the same reference numerals as those of the first embodiment of the present invention described above are used for the components of the wiper device 60 for convenience.

  In the wiper device 60, when the wiper 26 is being wiped, the upper inversion position P2 is displaced as follows.

  That is, the control circuit 34 inputs the signal output from the current detector 28 every time the wiper 26 is rotated from the lower inversion position P1 to the upper inversion position P2, and flows through the winding provided in the motor body 32. The first drive current I1 is detected. Then, the control circuit 34 calculates a current value reduction rate Rb of the detected first drive current I1 with respect to the reference current (that is, current value reduction rate Rb = (Io−I1) / Io when the reference current is Io). To do.

  In the control circuit 34, the first drive current I1 when the wiper 26 is rotated from the lower inversion position P1 to the upper inversion position P2 when the vehicle is stopped and when there is no wind is set in advance as the reference current Io.

  When the control circuit 34 determines that the current value decrease rate Rb has increased, the control circuit 34 changes the switching position where the motor main body 32 is reversely rotated from the normal rotation (that is, the switching timing is advanced), and the current value As the reduction rate Rb increases, the displacement amount α toward the lower inversion position P1 side of the upper inversion position P2 is continuously increased (that is, the wiping angle θ of the wiper 26 is continuously decreased; FIG. 10A). reference).

  When the control circuit 34 determines that the current value reduction rate Rb has decreased, the control circuit 34 changes the switching position where the motor body 32 is rotated in the reverse direction from the normal rotation (that is, delays the switching timing), and decreases the current value. As the rate Rb decreases, the displacement α to the lower inversion position P1 side of the upper inversion position P2 is continuously decreased (that is, the wiping angle θ of the wiper 26 is continuously increased; see FIG. 10A). ).

  That is, for example, when the speed of the vehicle gradually increases, the current value decrease rate Rb increases as the traveling wind force acting on the wiper 26 toward the upper reversal position P2 increases (FIG. 11). reference). Therefore, in this case, in order to prevent the interference between the wiper 26 and the A pillar 102, the control circuit 34 sets the displacement α to the lower inversion position P1 side of the upper inversion position P2 as the current value reduction rate Rb increases. It is continuously increased (that is, the wiping angle θ of the wiper 26 is continuously decreased; see FIG. 10A).

  Further, for example, when a natural headwind hits when the vehicle travels at a normal speed, the current value decrease rate Rb increases as the force of the natural headwind increases. Therefore, also in this case, the control circuit 34 has a displacement amount to the lower inversion position P1 side of the upper inversion position P2 as the current value decrease rate Rb increases in order to prevent the interference between the wiper 26 and the A pillar 102. α is continuously increased (that is, the wiping angle θ of the wiper 26 is continuously decreased; see FIG. 10A).

  On the other hand, for example, when a natural tailwind strikes when the vehicle travels at a normal speed, the current value decrease rate Rb decreases as the natural tailwind force increases. Therefore, in this case, the control circuit 34 continuously decreases the displacement amount α toward the lower inversion position P1 side of the upper inversion position P2 as the current value reduction rate Rb decreases in order to ensure the wiping range of the wiper 26. (That is, the wiping angle θ of the wiper 26 is continuously increased; see FIG. 10A).

  As described above, in the wiper device 60 according to the second embodiment of the present invention, the wiper 26 rotates according to the current value reduction rate Rb of the first drive current I1 when the wiper 26 is rotated from the lower inversion position P1 to the upper inversion position P2. By displacing the upper inversion position P2, appropriate variable control of the upper inversion position P2 is performed in consideration of not only the influence of the wind depending on the vehicle speed but also the influence of the natural headwind and tailwind.

  And according to wiper device 60 concerning a second embodiment of the present invention, the following operation and effect are produced.

  That is, according to the wiper device 60 according to the second embodiment of the present invention, as described above, the current value of the first drive current I1 when the wiper 26 is rotated from the lower inversion position P1 to the upper inversion position P2. By displacing the upper inversion position P2 in accordance with the decrease rate Rb, it is possible to appropriately control the upper inversion position P2 in consideration of not only the influence of wind depending on the vehicle speed but also the influence of natural headwinds and tailwinds. .

  In addition, by using the current value decrease rate Rb of the first drive current I1 in the wiper motor 12, it is possible to perform variable control of the upper inversion position P2 without using a vehicle speed signal from the vehicle speed sensor.

  As described above, according to the wiper device 60 according to the second embodiment of the present invention, the upper inversion position P2 can be variably controlled without using the vehicle speed signal from the vehicle speed sensor, and the wind speed depending on the vehicle speed can be controlled. In addition to the influence of the above, it is possible to perform an appropriate variable control of the inversion position P2 in consideration of the influence of natural headwinds and tailwinds.

  Further, according to the wiper device 60 according to the second embodiment of the present invention, for example, when the driving wind is strengthened as the vehicle travels at a high speed, or when a natural head wind hits the vehicle while driving, the first drive As the current value decrease rate Rb of the current I1 increases, the displacement α to the lower inversion position P1 side of the upper inversion position P2 is continuously increased (that is, the wiping angle θ of the wiper 26 is continuously decreased). ). Therefore, even if the wiper 26 receives the force of traveling wind or natural headwind and exceeds the upper reversal position P2, the displacement amount α toward the lower reversal position P1 side of the upper reversal position P2 is continuously increased. As a result, the gap dimension A between the wiper 26 and the A pillar 102 is kept substantially constant (see FIG. 10B), and interference between the wiper 26 and the A pillar 102 of the vehicle can be prevented.

  Further, according to the wiper device 60 according to the second embodiment of the present invention, for example, when the driving wind is weakened due to a decrease in the vehicle speed, or when a natural tailwind hits the vehicle while driving, the first drive current As the current value decrease rate Rb of I1 decreases, the displacement α to the lower inversion position P1 side of the upper inversion position P2 is continuously decreased (that is, the wiping angle θ of the wiper 26 is continuously increased). . As a result, a large wiping range of the wiper 26 can be secured, and the driver's field of view can be secured.

  As mentioned above, although 2nd embodiment of this invention was described, this invention is not limited above, Of course, it can change and implement variously within the range which does not deviate from the main point. is there.

  For example, in the embodiment described above, the displacement amount α toward the lower inversion position P1 side of the upper inversion position P2 is continuously increased or decreased as the current value decrease rate Rb increases or decreases (FIG. 10 ( A)), and may be configured as follows.

  That is, when the control circuit 34 determines that the current value reduction rate Rb is equal to or greater than a predetermined reference value tb, the upper inversion position P2 is displaced toward the lower inversion position P1 to reduce the wiping angle θ, When it is determined that the value reduction rate Rb is lower than the reference value tb, the upper inversion position P2 may be returned to the initial position to increase the wiping angle θ (see FIG. 12A).

  Even in such a configuration, similarly to the above-described embodiment, it is possible to perform appropriate variable control of the inversion position P2 in consideration of not only the influence of wind depending on the vehicle speed but also the influence of natural headwinds and tailwinds. it can. Further, for example, when the traveling wind becomes stronger as the vehicle speed increases, a clearance dimension A between the wiper 26 and the A pillar 102 is secured (FIG. 12B), so the wiper 26 and the A pillar 102 of the vehicle are secured. Interference with can be prevented. Furthermore, for example, when the traveling wind weakens as the vehicle speed decreases, the wiping range of the wiper 26 can be secured large, and the driver's field of view can be secured.

  In this case, a plurality of reference values tb1 and tb2 are set in the control circuit 34 step by step, and each time the control circuit 34 determines that the current value decrease rate Rb is equal to or greater than the reference values tb1 and tb2, The inversion position P2 is displaced to the lower inversion position P1 side to decrease the wiping angle θ, and the upper inversion position P2 is displaced to the initial position side every time it is determined that the current value decrease rate Rb is lower than the reference values tb1 and tb2. Thus, the wiping angle θ may be increased (see FIG. 13A).

  With this configuration, the variable control of the upper inversion position P2 (that is, the wiping angle θ of the wiper 26) can be performed more finely than when one reference value tb is set as described above. The gap dimension A between the wiper 26 and the A pillar 102 can be kept more constant (see FIG. 13B). In this case, if more reference values are set stepwise, the variable control of the upper inversion position P2 can be made more finely, and the gap dimension A can be kept more constant.

[Reference example]
Next, reference examples of the present invention will be described.

  In the wiper apparatus 80 (see FIG. 1) according to the reference example of the present invention, the operation of the control circuit 34 is displaced with respect to the wiper apparatus 10 according to the first embodiment of the present invention described above. The appearance configuration of the wiper device 80 according to this reference example is the same as that of the wiper device 10 according to the first embodiment of the present invention described above. Therefore, in the present reference example, the same reference numerals as those of the first embodiment of the present invention described above are used for the components of the wiper device 80 for convenience.

  In the wiper device 80, when the wiper 26 is being wiped, the upper inversion position P2 is displaced as follows.

  That is, the control circuit 34 inputs a signal output from the current detector 28 every time the wiper 26 is rotated from the upper inversion position P2 to the lower inversion position P1, and flows through the winding provided in the motor body 32. The second drive current I2 is detected. Then, the control circuit 34 calculates a current value increase rate Rc of the detected second drive current I2 with respect to the reference current (that is, current value increase rate Rc = (I2-Io) / Io when the reference current is Io). To do.

  In the control circuit 34, the second drive current I2 when the wiper 26 is rotated from the upper inversion position P2 to the lower inversion position P1 when the vehicle is stopped and when there is no wind is set in advance as the reference current Io.

  When the control circuit 34 determines that the current value increase rate Rc has increased, the control circuit 34 changes the switching position where the motor main body 32 is reversely rotated from the normal rotation (that is, the switching timing is advanced), and the current value is increased. As the increase rate Rc increases, the displacement amount α toward the lower inversion position P1 side of the upper inversion position P2 is continuously increased (that is, the wiping angle θ of the wiper 26 is continuously decreased; FIG. 14A). reference).

  In addition, when the control circuit 34 determines that the current value increase rate Rc has decreased, the control circuit 34 changes the switching position where the motor body 32 is rotated in the reverse direction from the normal rotation (that is, delays the switching timing), and increases the current value. As the rate Rc decreases, the displacement amount α toward the lower inversion position P1 side of the upper inversion position P2 is continuously decreased (that is, the wiping angle θ of the wiper 26 is continuously increased; see FIG. 14A). ).

  That is, for example, when the speed of the vehicle gradually increases, the current value increase rate Rc increases as the traveling wind force acting on the wiper 26 toward the upper reversal position P2 increases (FIG. 15). reference). Therefore, in this case, in order to prevent interference between the wiper 26 and the A pillar 102, the control circuit 34 sets the displacement amount α toward the lower inversion position P1 on the upper inversion position P2 as the current value increase rate Rc increases. It is continuously increased (that is, the wiping angle θ of the wiper 26 is continuously decreased; see FIG. 14A).

  Further, for example, when a natural headwind hits when the vehicle is traveling at a normal speed, the current value increase rate Rc increases as the force of the natural headwind increases. Therefore, also in this case, the control circuit 34 has a displacement amount to the lower inversion position P1 side of the upper inversion position P2 as the current value increase rate Rc increases in order to prevent the wiper 26 and the A pillar 102 from interfering with each other. α is continuously increased (that is, the wiping angle θ of the wiper 26 is continuously decreased; see FIG. 14A).

  On the other hand, for example, when natural tailwind hits when the vehicle travels at a normal speed, the current value increase rate Rc decreases as the natural tailwind force increases. Therefore, in this case, the control circuit 34 continuously decreases the displacement amount α toward the lower inversion position P1 side of the upper inversion position P2 as the current value increase rate Rc decreases in order to ensure the wiping range of the wiper 26. (That is, the wiping angle θ of the wiper 26 is continuously increased; see FIG. 14A).

  As described above, in the wiper device 80 according to this reference example, the upper inversion position according to the current value increase rate Rc of the second drive current I2 when the wiper 26 is rotated from the upper inversion position P2 to the lower inversion position P1. By displacing P2, appropriate variable control of the upper reversing position P2 is executed in consideration of not only the influence of wind depending on the vehicle speed but also the influence of natural headwinds and tailwinds.

  And according to wiper device 80 concerning this reference example, the following operation and effect are produced.

  That is, according to the wiper device 80 according to the present reference example, as described above, the current value increase rate Rc of the second drive current I2 when the wiper 26 is rotated from the upper inversion position P2 to the lower inversion position P1. Accordingly, by appropriately displacing the upper reversal position P2, it is possible to appropriately control the upper reversal position P2 in consideration of not only the influence of the wind depending on the vehicle speed but also the influence of natural headwinds and tailwinds.

  In addition, by using the current value increase rate Rc of the second drive current I2 in the wiper motor 12, it is possible to perform variable control of the upper inversion position P2 without using the vehicle speed signal from the vehicle speed sensor.

  As described above, according to the wiper device 80 according to the present reference example, the variable control of the upper inversion position P2 can be performed without using the vehicle speed signal from the vehicle speed sensor, and only by the influence of the wind depending on the vehicle speed. In addition, it is possible to perform appropriate variable control of the inversion position P2 in consideration of the effects of natural headwinds and tailwinds.

  Further, according to the wiper device 80 according to the present reference example, for example, when the traveling wind is strengthened as the vehicle travels at high speed, or when a natural head wind hits the vehicle while traveling, the current of the second drive current I2 As the value increase rate Rc increases, the displacement amount α toward the lower inversion position P1 side of the upper inversion position P2 is continuously increased (that is, the wiping angle θ of the wiper 26 is continuously decreased). Therefore, even if the wiper 26 receives the force of traveling wind or natural headwind and exceeds the upper reversal position P2, the displacement amount α toward the lower reversal position P1 side of the upper reversal position P2 is continuously increased. As a result, the gap dimension A between the wiper 26 and the A pillar 102 is kept substantially constant (see FIG. 14B), and interference between the wiper 26 and the A pillar 102 of the vehicle can be prevented.

  Further, according to the wiper device 80 according to the present reference example, for example, when the traveling wind is weakened due to a decrease in the vehicle speed, or when a natural tailwind is hit during traveling of the vehicle, the current value of the second drive current I2 As the increase rate Rc decreases, the displacement amount α toward the lower inversion position P1 side of the upper inversion position P2 is continuously decreased (that is, the wiping angle θ of the wiper 26 is continuously increased). As a result, a large wiping range of the wiper 26 can be secured, and the driver's field of view can be secured.

  Although the present reference example has been described above, the present reference example may be implemented with various modifications as follows.

  For example, in the above-described reference example, the displacement amount α toward the lower inversion position P1 side of the upper inversion position P2 is continuously increased or decreased as the current value increase rate Rc increases or decreases (FIG. 14 ( A)), and may be configured as follows.

  That is, when it is determined by the control circuit 34 that the current value increase rate Rc is equal to or greater than a predetermined reference value tc, the upper inversion position P2 is displaced to the lower inversion position P1 to reduce the wiping angle θ, When it is determined that the value increase rate Rc is below the reference value tc, the upper inversion position P2 may be returned to the initial position to increase the wiping angle θ (see FIG. 16A).

  Even in such a configuration, similarly to the above-described reference example, it is possible to perform appropriate variable control of the inversion position P2 in consideration of not only the influence of wind depending on the vehicle speed but also the influence of natural headwinds and tailwinds. it can. Further, for example, when the traveling wind becomes stronger as the vehicle speed increases, the clearance dimension A between the wiper 26 and the A pillar 102 is secured (FIG. 16B), so the wiper 26 and the A pillar 102 of the vehicle are secured. Interference with can be prevented. Furthermore, for example, when the traveling wind weakens as the vehicle speed decreases, the wiping range of the wiper 26 can be secured large, and the driver's field of view can be secured.

  In this case, a plurality of reference values tc1 and tc2 are set in the control circuit 34 step by step, and each time the control circuit 34 determines that the current value increase rate Rc is equal to or higher than the reference values tc1 and tc2. The inversion position P2 is displaced to the lower inversion position P1 side to decrease the wiping angle θ, and the upper inversion position P2 is displaced to the initial position side every time it is determined that the current value increase rate Rc is lower than the reference values tc1 and tc2. And the wiping angle θ may be increased (see FIG. 17A).

  With this configuration, the variable control of the upper inversion position P2 (that is, the wiping angle θ of the wiper 26) can be performed more finely than when the single reference value tc is set as described above. The gap dimension A between the wiper 26 and the A pillar 102 can be kept more constant (see FIG. 17B). In this case, if more reference values are set stepwise, the variable control of the upper inversion position P2 can be made more finely, and the gap dimension A can be kept more constant.

  In the following, the technical idea derived from the above reference example, and its operation and effect are described.

(1) A wiper motor, a wiper that reciprocally rotates between a lower reversing position and an upper reversing position in response to the driving force of the wiper motor, and wipes the wiping surface, and the wiper is moved from the upper reversing position to the lower reversing position. An upper reversing position displacing means for displacing the upper reversing position according to a current value increase rate with respect to a reference current of a driving current flowing through the wiper motor when the wiper motor is rotated to a wiper device.

  In the wiper device described in (1) above, when the wiper motor is operated, the wiper is reciprocated between the lower inversion position and the upper inversion position by receiving the driving force of the wiper motor, and the wiping surface is wiped off. Further, the upper inversion position of the wiper is displaced by the upper inversion position displacement means.

  Here, the upper inversion position displacing means displaces the upper inversion position in accordance with a current value increase rate with respect to the reference current of the drive current flowing in the wiper motor when the wiper is rotated from the upper inversion position to the lower inversion position.

  By the way, the drive current flowing through the wiper motor changes according to the motor load acting on the wiper motor through the wiper when the wiper is rotated from the upper reverse position to the lower reverse position. For example, if the wind force acts on the wiper from the upper reverse position to the upper reverse position when the wiper is rotated from the upper reverse position to the upper reverse position, the motor load acting on the wiper motor increases, so the drive current flowing through the wiper motor is To increase.

  The drive current flowing through the wiper motor changes not only when the above-described traveling wind, that is, the wind depending on the vehicle speed, acts on the wiper, but also when a natural headwind or tailwind acts on the wiper. Therefore, by displacing the upper reversal position according to the rate of increase in the drive current flowing to the wiper motor with respect to the reference current, the reversal takes into account not only the effect of wind depending on the vehicle speed but also the effect of natural headwinds and tailwinds. Appropriate variable control of the position becomes possible.

  In addition, by using the current value increase rate with respect to the reference current of the drive current flowing in the wiper motor, it is possible to perform variable control of the upper reversal position without using the vehicle speed signal from the vehicle speed sensor.

  As described above, according to the wiper device described in (1) above, the variable control of the upper reversal position can be performed without using the vehicle speed signal from the vehicle speed sensor, and only by the influence of the wind depending on the vehicle speed. In addition, it is possible to perform appropriate variable control of the reversing position in consideration of the effects of natural headwinds and tailwinds.

  (2) In the wiper device according to (1), the upper inversion position displacing means moves the upper inversion position toward the lower inversion position as the current value increase rate of the drive current with respect to the reference current increases. The amount of displacement is continuously increased.

  According to the wiper device described in (2) above, for example, when the driving wind is strengthened due to high-speed driving of the vehicle or when a natural head wind is hit during driving, the drive current increases, and as a result The increase rate of the current value with respect to the reference current of the drive current increases. As the current value increase rate increases, the amount of displacement of the upper inversion position toward the lower inversion position is continuously increased (that is, the wiper wiping angle is decreased). Therefore, even when a traveling wind or a natural headwind is applied, the wiper can be prevented from interfering with the vehicle body or the like beyond the initial upper reversal position.

  (3) In the wiper device according to (2), the upper reversal position displacing means is configured so that when the current value increase rate of the drive current with respect to the reference current is equal to or higher than a predetermined reference value, The inversion position is displaced to the lower inversion position side.

  According to the wiper device described in (3) above, for example, when the driving wind is strengthened due to high-speed driving of the vehicle or when a natural head wind is hit during driving, the drive current increases, and as a result The increase rate of the current value with respect to the reference current of the drive current increases. When the current value increase rate of the drive current with respect to the reference current becomes equal to or greater than a predetermined reference value, the upper inversion position is displaced toward the lower inversion position (that is, the wiper wiping angle is reduced). ). Therefore, even when a traveling wind or a natural headwind is applied, the wiper can be prevented from interfering with the vehicle body or the like beyond the initial upper reversal position.

  (4) In the wiper device according to (3), the upper inversion position displacement unit includes a plurality of the reference values stepwise, and a current value increase rate of the drive current with respect to the reference current is the reference value. Whenever it becomes above, the said upper inversion position is displaced to the said lower inversion position side, It is characterized by the above-mentioned.

  According to the wiper device described in (4) above, the upper inversion position is displaced toward the lower inversion position each time the current value increase rate of the drive current with respect to the reference current becomes equal to or greater than each reference value. It is possible to perform variable control of the fine upper inversion position (that is, the wiper wiping angle).

  (5) In the wiper device according to any one of (1) to (4), the upper inversion position displacing unit is configured to change the upper current according to a decrease in a current value increase rate of the drive current with respect to the reference current. The inversion position is displaced to the initial position side.

  According to the wiper device described in the above (5), for example, when the driving wind is weakened due to a decrease in the vehicle speed or when a natural tailwind hits the vehicle while driving, the driving current is reduced, resulting in driving. The increase rate of the current value with respect to the reference current decreases. Then, the upper inversion position is displaced to the initial position side in accordance with the decrease in the current value increase rate (that is, the wiper wiping angle is increased). Thereby, a large wiper wiping range can be secured.

It is a figure which shows the whole structure of the wiper apparatus which concerns on 1st embodiment (2nd, 3rd embodiment) of this invention. It is a block diagram which shows the internal structure of the wiper motor with which the wiper apparatus of FIG. 1 was equipped. (A) The figure which shows the relationship between an electric current value ratio and a wiping angle, (B) It is a figure which shows the relationship between a vehicle speed and a clearance gap dimension. (A)-(E) It is a figure which shows the relationship between time and a current value ratio. It is a figure which shows the relationship between a vehicle speed and an electric current value ratio. (A), (B) It is a figure which shows the analysis result of the relationship between a vehicle speed and an electric current value ratio. (A) The figure which shows the relationship between an electric current value ratio and a wiping angle, (B) It is a figure which shows the relationship between a vehicle speed and a clearance gap dimension. (A) The figure which shows the relationship between an electric current value ratio and a wiping angle, (B) It is a figure which shows the relationship between a vehicle speed and a clearance gap dimension. It is a figure which shows the whole structure of the wiper apparatus which concerns on a modification. (A) The figure which shows the relationship between an electric current value decreasing rate and a wiping angle, (B) It is a figure which shows the relationship between a vehicle speed and a clearance gap dimension. It is a figure which shows the relationship between a vehicle speed and a current value decreasing rate. (A) The figure which shows the relationship between an electric current value decreasing rate and a wiping angle, (B) It is a figure which shows the relationship between a vehicle speed and a clearance gap dimension. (A) The figure which shows the relationship between an electric current value increase rate and a wiping angle, (B) It is a figure which shows the relationship between a vehicle speed and a clearance gap dimension. (A) The figure which shows the relationship between an electric current value increase rate and a wiping angle, (B) It is a figure which shows the relationship between a vehicle speed and a clearance gap dimension. It is a figure which shows the relationship between a vehicle speed and an electric current value increase rate. (A) The figure which shows the relationship between an electric current value increase rate and a wiping angle, (B) It is a figure which shows the relationship between a vehicle speed and a clearance gap dimension. (A) The figure which shows the relationship between an electric current value increase rate and a wiping angle, (B) It is a figure which shows the relationship between a vehicle speed and a clearance gap dimension.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,60,80 ... Wiper apparatus, 12 ... Wiper motor, 14 ... Output shaft, 16 ... Crank arm, 18 ... Connecting rod, 20 ... Pivot lever, 22 ... Pivot holder, 24 ... Pivot shaft, 26 ... Wiper, 28 ... Current Detector 30 ... Rotation position detector 32 ... Motor body 34 ... Control circuit 40, 42 ... Link arm 44 ... Connection part 46 ... Actuator 48 ... Crank arm 100 ... Windshield 102 ... Pillar , P1 ... lower reverse position, P2 ... upper reverse position

Claims (11)

A wiper motor,
A wiper that receives the driving force of the wiper motor and reciprocates between a lower reversing position and an upper reversing position to wipe the wiping surface;
A first drive current that flows through the wiper motor when the wiper is rotated from the lower reverse position to the upper reverse position, and the wiper motor when the wiper is rotated from the upper reverse position to the lower reverse position An upper inversion position displacing means for displacing the upper inversion position in accordance with a current value ratio with a second drive current flowing through
A wiper device comprising:   The upper inversion position displacement means continuously increases the amount of displacement of the upper inversion position toward the lower inversion position as the current value ratio of the first driving current to the second driving current decreases. The wiper device according to claim 1, wherein   The upper inversion position displacing means displaces the upper inversion position to the lower inversion position side when a current value ratio of the first driving current to the second driving current is equal to or less than a predetermined reference value. The wiper device according to claim 1.   The upper reversal position displacement means has a plurality of the reference values stepwise, and each time the current value ratio of the first drive current to the second drive current becomes equal to or less than each reference value, the upper reversal position The wiper device according to claim 3, wherein the wiper device is displaced toward the lower inversion position.   The upper reversal position displacing means displaces the upper reversal position toward an initial position in accordance with an increase in a current value ratio of the first drive current to the second drive current. The wiper device according to any one of 4. A wiper motor,
A wiper that receives the driving force of the wiper motor and reciprocates between a lower reversing position and an upper reversing position to wipe the wiping surface;
Upper reversal position displacing means for displacing the upper reversal position according to a current value reduction rate with respect to a reference current of a drive current flowing through the wiper motor when the wiper is rotated from the lower reversal position to the upper reversal position;
A wiper device comprising:   The upper inversion position displacing means continuously increases the amount of displacement of the upper inversion position toward the lower inversion position as the current value decrease rate of the drive current with respect to the reference current increases. The wiper device according to claim 6.   The upper inversion position displacing means displaces the upper inversion position toward the lower inversion position when a current value reduction rate of the drive current with respect to the reference current is equal to or greater than a predetermined reference value. The wiper device according to claim 6.   The upper inversion position displacing means has a plurality of the reference values stepwise, and each time the current value decrease rate of the drive current with respect to the reference current exceeds the reference values, the upper inversion position is set to the lower inversion position. The wiper device according to claim 8, wherein the wiper device is displaced toward a reverse position.   10. The upper inversion position displacing means displaces the upper inversion position to the initial position side in accordance with a decrease in a current value reduction rate of the drive current with respect to the reference current. The wiper device according to claim 1. The wiper is reversed at the upper reversal position in accordance with switching from normal rotation to reverse rotation of the wiper motor.
The upper reversal position displacement means displaces the upper reversal position by changing a switching position of the wiper motor from forward rotation to reverse rotation. The wiper device described.

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