JP6029695B2 - Washer injection device - Google Patents

Description

  The present invention relates to a washer injection device that injects a washer liquid onto a windshield or the like of a vehicle.

  As a device for injecting washer liquid onto a windshield of a vehicle, there is a wiper device described in Patent Document 1. In this apparatus, a washer nozzle is provided on a wiper arm, and the wiper arm reciprocates in an arc shape by a wiper motor. At this time, the washer liquid is sprayed only on the forward path side when the wiper arm moves forward, and the washer liquid is sprayed only on the backward path side when the wiper arm moves backward. As a result, the wiping surface can be cleaned well without obstructing the driver's field of view, and the wiper motor can be cleaned smoothly without overloading.

Japanese Utility Model Publication No. 6-27482

  However, in the apparatus of Patent Document 1, since the washer nozzle is provided on the wiper arm, the height of the washer nozzle varies depending on the arc motion of the wiper arm. For example, the height of the washer nozzle is higher when the wiper arm is in a vertical state than in the horizontal state (see the washer nozzle 13 in FIG. 2). At this time, if the discharge pressure of the washer pump is the same, the nozzle position is higher when the arm is in the vertical state than in the horizontal state, so that the amount of washer fluid injected is reduced.

  That is, since the amount of washer liquid sprayed varies depending on the height of the nozzle, there is a problem that excess or deficiency occurs with respect to the target spray amount. When the injection amount is insufficient, for example, the cleaning performance of the windshield is deteriorated. When the injection amount is excessive, for example, the washer liquid in the washer tank is quickly reduced.

  The present invention has been made in view of such circumstances, and provides a washer injection device capable of injecting a predetermined amount of washer liquid regardless of the height position of the washer nozzle provided in the wiper arm. Objective.

  As means for solving the above-mentioned problems, the invention according to claim 1 is directed to a wiper blade for wiping a window glass provided in a vehicle, a wiper arm for supporting the wiper blade, and displacing the wiper arm at least in the vertical direction. A drive mechanism including a motor; a washer nozzle that injects washer liquid onto the window glass; a washer pump that supplies the washer liquid to the washer nozzle; and a control unit that controls discharge pressure of the washer pump, A washer nozzle is provided on the wiper blade or the wiper arm, and the control means controls the discharge pressure of the washer pump to be higher when the position of the wiper arm is higher than when the position of the wiper arm is low. And

  According to this configuration, the higher the height of the washer nozzle (nozzle), the higher the discharge pressure of the washer pump (pump). Therefore, a predetermined amount of washer liquid can be ejected regardless of the height position of the washer nozzle provided on the wiper arm (arm). Thereby, even if a nozzle exists in a high position, the wiping effect of window glass (glass) can be improved. Further, if the discharge pressure of the pump is increased as the height of the nozzle is increased, the decrease or increase in the washer liquid due to the height position of the nozzle can be avoided. For this reason, the fall of the wiping performance of glass and the useless consumption of a washer liquid can be suppressed or prevented.

According to a second aspect of the present invention, in the first aspect, the control unit includes a nozzle height detection unit that detects a height of the washer nozzle, and the washer nozzle regardless of the height of the washer nozzle. The storage means is provided with table information that defines the relationship between the discharge pressure of the washer pump and the height of the washer nozzle so that the injection amount of the washer liquid injected from the storage device is constant. When controlling the washer pump so that the discharge pressure of the washer pump is higher than when it is low, the nozzle height detected by the nozzle height detection unit is applied to the table information to pump discharge pressure. And the discharge pressure of the washer pump is controlled so that the calculated pump discharge pressure is obtained .

  According to this configuration, the amount of washer liquid sprayed can be made constant regardless of the height of the washer nozzle. For this reason, if a certain amount of sprayed washer liquid is determined so that the window glass (glass) can be wiped down to the optimum level, the glass wiping performance can be improved. Wasteful consumption can be further suppressed or prevented.

  According to a third aspect of the present invention, in the first aspect, the washer nozzle includes an outward path side nozzle that injects when the wiper arm moves forward, and a return path side nozzle that injects when the wiper arm moves backward, the control means Is characterized in that the discharge pressure of the washer pump is controlled to be higher during the forward movement than during the backward movement of the wiper arm.

  According to this configuration, when the wiper arm is moved backward, the washer liquid is jetted upward, but the discharge pressure of the washer pump is increased as compared with that during the backward movement, so that the wiping performance of the window glass is not deteriorated. In addition, an appropriate amount of washer liquid can be injected. Thereby, the wiping effect of the window glass can be improved even when the arm moves forward. Further, at the time of backward movement, the discharge pressure is lower than that at the time of forward movement, but since it is ejected downward, it is possible to inject a necessary amount of washer liquid for wiping to a position where a decrease in wiping performance is avoided. Accordingly, it is possible to suppress or prevent a decrease in wiping performance during forward movement and useless consumption of the washer liquid during backward movement.

  The invention according to claim 4 includes the detection means for detecting the viscosity of the washer liquid according to any one of claims 1 to 3, wherein the control means is lower than when the viscosity detected by the detection means is low. However, the discharge pressure of the washer pump is controlled to be higher when the pressure is higher.

  According to this configuration, the optimum discharge pressure can be set according to the viscosity of the washer liquid. That is, when the viscosity of the washer liquid is high, it is difficult for the washer liquid to flow, but by increasing the discharge pressure of the washer pump, it is possible to inject an appropriate amount of washer liquid onto the window glass. Accordingly, it is possible to suppress or prevent a decrease in wiping performance. On the other hand, when the viscosity of the washer liquid is low, the washer liquid properly flows from the tank to the nozzle and is injected even if the discharge pressure of the washer pump is low. Therefore, when the viscosity of the washer liquid is low, wasteful consumption of the washer liquid can be suppressed or prevented by lowering the discharge pressure of the washer pump, and furthermore, driving power of the washer pump can be suppressed. Can do.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the control unit is configured to position the wiper arm immediately before the washer liquid sprayed from the washer nozzle jumps out of the window glass. , Characterized by performing control to gradually reduce the discharge pressure of the washer pump,

  According to this configuration, it is possible to wipe the window glass properly while suppressing waste of the washer liquid flowing out of the window glass.

  A sixth aspect of the present invention provides the method according to any one of the first to fifth aspects, wherein the control means stops the washer liquid ejected from the washer nozzle at the start and end positions of the reciprocating operation of the wiper arm. The discharge pressure of the washer pump is controlled.

  According to this configuration, waste of the washer liquid can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the washer injection apparatus which can inject a predetermined amount of washer liquid irrespective of the height position of the washer nozzle provided in the wiper arm can be provided.

1 is a perspective view of a vehicle using a washer injection device according to a first embodiment of the present invention. (A) The figure shows the wiper arm, wiper blade and washer nozzle moving forward on the windshield, and (b) the wiper arm, wiper blade and washer nozzle moving backward on the windshield. It is a block diagram which shows the structure of the control part of the washer injection device concerning a 1st embodiment. 6 is an angle / height correspondence map showing a relationship between an arm angle θ and a nozzle height H. FIG. It is a height / discharge pressure correspondence map showing the relationship between the nozzle height H and the pump discharge pressure P. It is a flowchart for demonstrating control of the discharge pressure of a washer pump by the control part of the washer injection device concerning a 1st embodiment. It is a block diagram which shows the control part of the washer injection device concerning a 2nd embodiment of the present invention. FIG. 10 is a height / discharge pressure correspondence map showing a relationship between a nozzle height H and a pump discharge pressure P when the wiper arm according to the second embodiment is moving forward and backward. It is a flowchart for demonstrating control of the discharge pressure of a washer pump by the control part of the washer injection device concerning a 2nd embodiment. It is a perspective view of the vehicle using the washer injection device concerning a 3rd embodiment of the present invention. It is a block diagram which shows the control part of the washer injection device concerning a 3rd embodiment of the present invention. It is a viscosity-correction value correspondence map figure which shows the relationship between the viscosity (eta) of the washer liquid which concerns on 3rd Embodiment, and correction value (alpha). It is a figure which shows from the starting position P0 to the end position P3 at the time of the reciprocating operation | movement of the wiper arm on the windshield which concerns on a modification.

  Embodiments of the present invention will be described in detail with reference to FIGS. In the description, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted. Moreover, when explaining a direction, it demonstrates based on the front and rear, right and left upper and lower sides seen from the driver | operator (not shown) of the vehicle.

<Configuration of First Embodiment>
FIG. 1 is a perspective view of a vehicle using a washer injection device according to a first embodiment of the present invention.
As shown in FIG. 1, the washer injection device 10 of the vehicle 1 includes a wiper arm 11, a wiper blade 12, a washer nozzle 13, a wiper motor 14, a rotation angle detection sensor 14 a, a washer tank 15, and a washer pump 16. The pipe 18 connecting the washer pump 16 and the washer nozzle 13 and a control unit (control means) 19 are provided.

  The wiper arm 11 is the arm 11, the wiper blade 12 is the blade 12, the washer nozzle 13 is the nozzle 13, the wiper motor 14 is the motor 14, the rotation angle detection sensor 14a is the sensor 14a, the washer tank 15 is the tank 15, and the washer pump 16 is the pump 16. Sometimes omitted.

The wiper motor 14 is a brushless motor or the like, and is disposed inside the engine hood 3 on the front side of the windshield 2 in the vehicle 1. The wiper motor 14 drives the arm 11 so as to reciprocate in an arc around the axis of the rear end portion (referred to as arm rear end portion) 11a of the wiper arm 11 in the vehicle front-rear direction.
The rotation angle detection sensor 14 a detects the rotation angle of the rotation shaft of the motor 14 and outputs it to the control unit (control means) 19. The windshield 2 is a window glass described in claims, and is also simply referred to as glass 2.

  The wiper arm 11 has a rod shape and is attached to a gear link mechanism or the like provided on a cowl top in the vicinity of the front right side of the glass 2, and a rod-like portion extending linearly from the arm rear end portion 11 a is lateral to the outer surface of the glass 2. Arranged in the direction. A washer nozzle 13 is attached to the tip of the wiper arm 11.

  The shaft of the arm rear end portion 11a and the shaft of the wiper motor 14 are assembled via a gear link mechanism or the like (not shown). For example, the assembly structure of the wiper motor 14 and the arm rear end portion 11a is not shown, but as is well known, a gear link mechanism is combined with the motor 14, and a link rod (not shown) operated by the gear link mechanism is provided. The wiper arm 11 is connected to the link rod so that the arm 11 reciprocates in an arc shape. In addition, if the motor 14 is a stepping motor, the shaft of the motor 14 may be combined with the shaft of the arm rear end portion 11a via a joining member or the like. As the motor 14, a motor having a variable rotation angle such as a servo motor can be used. The drive mechanism according to the claims is configured by the wiper motor 14 alone or a combination of the wiper motor 14, a gear link mechanism, a link rod, and the like.

  The wiper blade 12 has a narrow longitudinal shape formed of an elastic material such as a rubber material. This blade 12 is attached to the tip of the wiper arm 11 through a washer nozzle 13 in the middle of the longitudinal shape. The attachment state of the blade 12 is along the longitudinal direction of the arm 11. Further, the blade 12 moves together with the arm 11 that reciprocates in an arc shape in accordance with the rotational drive of the motor 14 from the substantially horizontal state shown in FIG. 1 to the forward path side toward the substantially vertical state shown in FIG. Thereafter, a reciprocating operation is performed such as operating toward the return path toward the substantially horizontal state shown in FIG. At this time, the washer nozzle 13 also reciprocates integrally.

  The washer nozzle 13 is fixed to the tip of the wiper arm 11 and sprays the washer liquid onto the glass 2. The nozzle 13 includes an outward path side nozzle 13a and a return path side nozzle 13b. As shown in FIG. 2A, the forward path side nozzle 13 a injects the washer liquid toward the forward path side movement direction when the arm 11 moves to the forward path side. As shown in FIG. 2B, the return-side nozzle 13b injects washer fluid toward the return-side movement direction when moving to the return-side. The switching of the injection direction is performed by the control unit 19 (see FIG. 3) as described later.

  The washer tank 15 shown in FIG. 1 is a tank for storing a washer liquid formed of a material such as resin, and is disposed at a position below the right side wall in the engine room 4a in which the engine 4 is disposed.

  The washer pump 16 is a drive source for injecting the washer liquid in the tank 15 from the nozzle 13 via the pipe 18. The washer pump 16 is an electric pump in which a pump (not shown) for injecting washer fluid and a motor (not shown) for rotating the impeller (not shown) of this pump are integrated. This device is disposed on the lower surface of the tank 15.

  The pipe 18 is a flow path that is formed of vinyl or plastic material, connects the pump 16 and the nozzle 13, and supplies the washer liquid discharged from the pump 16 to the nozzle 13. The pipe 18 passes through the cavity of the wiper arm 11 and is connected to the nozzle 13 as indicated by a broken line in FIG.

The control unit 19 controls the operations of the wiper motor 14 and the washer pump 16, and is configured as shown in FIG.
As shown in FIG. 3, the control unit 19 includes a motor control unit 21, a nozzle height detection unit 22 that stores angle / height correspondence table information D <b> 1 in a storage unit (not shown), and a height / discharge pressure. And a pump control unit 23 that stores correspondence table information D2 in a storage unit (not shown). Although not shown, the control unit 19 includes a storage device such as a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and a hard disk, and these elements can transmit information. It is configured to be connected to the bus. The angle / height correspondence table information D1 and the height / discharge pressure correspondence table information D2 are also referred to as table information D1 and D2.

  The motor control unit 21 rotationally drives the wiper motor 14 by a motor control signal when the wiper switch 31 disposed in the vehicle 1 is ON (on), and stops the wiper motor 14 when the wiper switch 31 is OFF (on). In addition, the motor control unit 21 switches the rotation direction of the rotation shaft of the motor 14 between forward rotation and reverse rotation by the motor control signal to reciprocate the wiper arm 11, and at this time, by increasing or decreasing the current flowing to the motor 14, Change the speed during reciprocating operation slowly. When the motor 14 rotates in the forward direction, the wiper arm 11 moves toward the forward path, and when the motor 14 rotates in the reverse direction, the wiper arm 11 moves toward the backward path.

The motor control signal from the motor control unit 21 is also output to the ejection direction switching unit 13 c provided inside the washer nozzle 13.
When the input motor control signal is a normal rotation control signal, the injection direction switching unit 13c causes the washer fluid flowing in the direction indicated by the arrow Y1 through the pipe 18 to be injected from the forward path side nozzle 13a as indicated by the arrow Y1a. The flow path is switched. On the other hand, when the motor control signal is a reverse rotation control signal, the flow path is switched so that the washer liquid is ejected from the return-side nozzle 13b as indicated by the arrow Y1b.

  When the arm 11 moves to the forward path side by switching the spray direction of the washer liquid in the ejection direction switching unit 13c in this way, the washer liquid is ejected from the forward path side nozzle 13a as shown by the arrow Y1a, and the arm 11 is When moving to the return path side, the washer liquid is ejected from the return path side nozzle 13b as indicated by an arrow Y1b.

  The nozzle height detection unit 22 detects the nozzle height H. The nozzle height H is, as shown in FIG. 2A or 2B, between the position L1 of the washer liquid discharge port of the washer pump 16 and the position Lc or Lk of the injection port of the washer nozzle 13. H1c or H1k. This nozzle height H1c or H1k always varies while the arm 11 is reciprocating. 2A and 2B show, as an example, a state in which each nozzle height H1c, H1k has a water head difference indicated by HΔ.

  The nozzle height H1c or H1k is a constant height (referred to as a base height) H1 between the position L1 of the discharge port of the pump 16 and the axis of the arm rear end portion 11a, and the axis of the arm rear end portion 11a. The nozzle 13 can be divided into fluctuating heights (referred to as fluctuating heights) Hc and Hk between the positions Lc or Lk of the nozzle 13.

  More specifically, the fluctuating nozzle height H is as follows. For example, when the arm 11 moves forward and the position of the injection port of the nozzle 13 is Lk as shown in FIG. 2A, the height of fluctuation from the axis of the arm rear end 11a to the position of the injection port Lk of the nozzle 13 Becomes Hk. In this case, the added value of the fluctuation height Hk and the base height H1 is the nozzle height H1k. When the arm 11 moves backward, as shown in FIG. 2B, when the position of the injection port of the nozzle 13 is Lc, the height of fluctuation from the axis of the arm rear end portion 11a to the position Lc of the injection port of the nozzle 13 is Hc. In this case, the added value of the fluctuation height Hc and the base height H1 is the nozzle height H1c.

  Here, since the length of the arm 11 is constant, if the operating angle of the arm 11 (referred to as the arm angle θ) is known, the jet of the nozzle 13 is ejected from the axis of the arm rear end portion 11a shown in FIGS. Fluctuating heights Hc and Hk to the mouth are obtained by trigonometry. The nozzle height H1c or H1k is obtained by adding the fluctuation height Hc or Hk to the base height H1. Therefore, the relationship between the arm angle θ and the nozzle height H is determined in advance as shown in an angle / height correspondence map diagram (also referred to as a map diagram) shown in FIG.

  FIG. 4 shows the arm angle as θ1 degree (minimum angle) to θ1m degree (maximum angle) on the horizontal axis, and the nozzle height as H1 (minimum height) to H1m (maximum height) on the vertical axis. FIG. 6 is an angle / height correspondence map showing a correspondence relationship between θ and the nozzle height H1 by a graph line G1. The correspondence between the arm angle θ and the nozzle height H in this map diagram is represented by data values in the angle / height correspondence table information D1 shown in FIG.

  When detecting the nozzle height H, the nozzle height detection unit 22 converts the rotation angle Mθ of the rotation axis of the wiper motor 14 detected by the rotation angle detection sensor 14a into an arm angle θ, and the converted arm angle θ. Is applied to the table information D1, and the nozzle height H is detected.

  However, here, in order to simplify the description, it is assumed that the rotation angle Mθ of the motor 14 and the arm angle θ match. For example, if the operating angle (arm angle θ) of the linear arm 11 with respect to the horizontal line is 0 degree (minimum angle) to 90 degrees (maximum angle), the rotation angle Mθ of the motor 14 is also 0 degree to 90 degrees. The arm 11 reciprocates between 0 and 90 degrees as the motor 14 rotates alternately forward and reverse.

The nozzle height H detected by the nozzle height detection unit 22 as described above is input to the pump control unit 23.
The pump control unit 23 causes the washer pump 16 to discharge the washer liquid in the tank 15 to the pipe 18 (FIG. 1) at a discharge pressure (also referred to as pump discharge pressure) P corresponding to the input nozzle height H. The pump 16 is controlled by a pump control signal.

  The pump control signal is, for example, a PWM (Pulese Width Modulation) control signal. By changing the duty ratio of the PWM control signal and variably controlling the rotational speed of a motor (not shown) that is a component of the pump 16, the discharge pressure (pump discharge pressure P) of the pump 16 can be changed. Yes. When the pump discharge pressure P is increased, the duty ratio of the PWM control signal is increased, and when it is decreased, the duty ratio is decreased.

  The relationship between the nozzle height H and the pump discharge pressure P is determined as shown in a height / discharge pressure correspondence map (also referred to as a map diagram) shown in FIG. FIG. 5 shows the nozzle height H on the horizontal axis as H1 (minimum height) to H1m (maximum height), the pump discharge pressure P on the vertical axis, and P1 (minimum discharge pressure) to P1m (maximum discharge pressure). It is shown as Further, the relationship between the nozzle height H and the pump discharge pressure P is, as indicated by the graph line G2, regardless of the height of the nozzle height H, the amount of washer fluid injected from the nozzle 13 is constant (for example, The pump discharge pressure P is defined so as to be constant at an injection amount of 1.5 cc / sec. The spray amount of the constant washer liquid can be arbitrarily changed. The correspondence between the nozzle height H and the pump discharge pressure P in the map diagram of FIG. 5 is represented by data values in the height / discharge pressure correspondence table information D2.

  More specifically, the relationship between the nozzle height H indicated by the graph line G2 and the pump discharge pressure P is constant regardless of whether the nozzle height H is high or low. Thus, the relationship in which the pump discharge pressure P increases or decreases according to the height of the nozzle height H is shown. That is, based on this graph line G2, the pump control unit 23 shown in FIG. 3 uses the pump height of the washer liquid from the nozzle 13 to be constant when the nozzle height H is higher than when it is low. The pump discharge pressure P is controlled to be high. With this control, the amount of washer fluid sprayed from the nozzle 13 becomes constant regardless of the height of the nozzle 13.

  Therefore, the pump control unit 23 obtains the pump discharge pressure P by fitting the nozzle height H detected by the nozzle height detection unit 22 to the table information D2. Thereafter, the pump control unit 23 controls the discharge pressure of the pump 16 by the pump control signal so that the determined pump discharge pressure P is obtained. By this control, the pump 16 sucks the washer liquid from the tank 15 at the control discharge pressure P and discharges it to the pipe 18 (FIG. 1). The washer liquid discharged to the pipe 18 passes through the pipe 18 and is sprayed from the nozzle 13 onto the glass 2 at a constant amount of, for example, 1.5 cc / second.

  The angle / height correspondence table information D1 and the height / discharge pressure correspondence table information D2 may be combined into one. This is the angle / discharge pressure correspondence table information corresponding to the map diagram in which the arm angle θ shown in FIG. 4 is taken on the horizontal axis and the pump discharge pressure P shown in FIG. 5 is taken on the vertical axis. The pump control unit 23 obtains the pump discharge pressure P using the angle / discharge pressure correspondence table information. In this case, there is no nozzle height detection unit 22, and the rotation angle Mθ detected by the rotation angle detection sensor 14 a is input to the pump control unit 23. The pump control unit 23 uses the angle / discharge pressure correspondence table information to obtain the pump discharge pressure P from the arm angle θ corresponding to the input rotation angle Mθ.

  The control (referred to as constant control) for making the amount of washer fluid sprayed from the nozzle 13 constant regardless of the height of the nozzle 13 (referred to as constant control) is also performed when the washer switch 32 is turned on. Yes.

  In general, when the washer switch 32 is turned ON, the pump 16 is operated and the washer liquid is ejected from the nozzle 13. At the same time, the arm 11 is reciprocated by the wiper motor 14, and the wiper blade 12 reciprocates the upper surface of the glass 2 a predetermined number of times (for example, three times). During the three reciprocating operations, washer fluid is ejected.

  In the present embodiment, when the blade 12 performs the reciprocating motion three times, the pump control unit 23 using the motor control signal from the motor control unit 21 and the nozzle height H22 from the nozzle height detection unit 22 performs the above operation. Constant control is performed. That is, when the nozzle height H is low {see FIG. 2 (b)}, the pump control unit 23 makes the injection amount of the washer liquid injected from the nozzle 13 constant regardless of the height of the nozzle height H. The pump discharge pressure P is controlled to be higher when it is higher {see FIG. 2 (a)}.

<Operation of First Embodiment>
Next, control of the discharge pressure of the washer pump 16 by the control unit 19 will be described with reference to the flowchart shown in FIG.
In step S1, when the wiper switch 31 is turned ON, the motor control unit 21 drives the wiper arm 11 to reciprocate by rotating the wiper motor 14 alternately between forward rotation and reverse rotation according to the motor control signal. At this time, the wiper blade 12 and the washer nozzle 13 attached to the arm 11 also reciprocate together. At this time, it is assumed that the washer switch 32 is turned on, the pump 16 is operated, and the washer liquid is ejected from the nozzle 13.

  The washer switch 32 is turned on, and the washer liquid is ejected from the nozzle 13, and at the same time the arm 11 is reciprocated by the motor 14, and the blade 12 reciprocates a predetermined number of times on the upper surface of the glass 2. It may be assumed that it is injected.

  When the arm 11 performs the reciprocating operation, in step S2, the nozzle height detection unit 22 converts the rotation angle Mθ of the motor 14 detected by the rotation angle detection sensor 14a into the arm angle θ, and the converted arm angle. The nozzle height H is detected by applying θ to the table information D1 (FIG. 4).

  For example, when the arm 11 moves forward, when the position of the injection port of the nozzle 13 is Lk as shown in FIG. 2A, the fluctuation height is Hk. In this case, the nozzle height H1k is detected by adding the fluctuation height Hk to the base height H1. On the other hand, when the arm 11 moves backward, as shown in FIG. 2B, when the position of the injection port of the nozzle 13 is Lc, the fluctuation height is Hc. In this case, the nozzle height H1c is detected by adding the fluctuation height Hc to the base height H1. Here, it is assumed that the nozzle height H1k shown in FIG. The nozzle height H1k is input to the pump control unit 23.

  Next, in step S3, the pump control unit 23 applies the input nozzle height H1k to the height / discharge pressure correspondence table information D2 (FIG. 5) to obtain the pump discharge pressure P1k. Thereafter, in step S4, the pump control unit 23 controls the discharge pressure of the pump 16 by the pump control signal so that the determined pump discharge pressure P1k is obtained.

  By this control, in step S5, the pump 16 sucks the washer liquid from the tank 15 at the control discharge pressure P1k and discharges it to the pipe 18. The washer liquid discharged to the pipe 18 is sprayed from the nozzle 13 to the windshield 2 at a constant amount of, for example, 1.5 cc / second.

  However, the wiper arm 11 may be configured to reciprocate in the vertical direction between the upper end portion and the lower end portion of the glass 2 by a vertical reciprocating mechanism (not shown) including the wiper motor 14. In this case, the wiper blade 12 and the washer nozzle 13 reciprocate in the same manner as the arm 11.

<Effects of First Embodiment>
The washer injection device 10 according to the first embodiment described above includes a wiper blade 12 for wiping a windshield 2 that is a window glass provided in a vehicle, a wiper arm 11 for supporting the wiper blade 12, and a wiper arm 11 at least in the vertical direction. A wiper motor 14 serving as a drive mechanism for displacing, a washer nozzle 13 for injecting washer liquid onto the window glass, a washer pump 16 for supplying washer liquid to the washer nozzle 13, and control means for controlling the discharge pressure of the washer pump 16 The control part 19 is provided.

  The feature of the first embodiment is that the nozzle 13 is provided on the blade 12 or the arm 11, and the control unit 19 controls the discharge pressure of the pump 16 to be higher when the position of the arm 11 is lower than when the position of the arm 11 is low. Is to do.

  According to this configuration, the discharge pressure of the pump 16 can be increased as the height of the nozzle 13 is higher. Therefore, a predetermined amount of washer liquid can be ejected regardless of the height position of the nozzle 13 provided on the arm 11. Thereby, even if the nozzle 13 is in a high position, the wiping effect of the glass 2 can be improved.

  Moreover, since the discharge pressure of the pump 16 is increased as the height of the nozzle 13 is higher, it is possible to avoid the decrease or increase in the washer liquid due to the height position of the nozzle 13. For this reason, the fall of the wiping performance of the glass 2 and the useless consumption of a washer liquid can be suppressed or prevented.

  In addition, when the control unit 19 controls the discharge pressure of the washer pump 16 to be higher when the position of the wiper arm 11 is higher than when the position of the wiper arm 11 is low, Control was performed so that the amount of washer fluid sprayed from 13 was a constant amount.

  According to this configuration, regardless of the height of the washer nozzle 13, the amount of washer liquid sprayed can be made constant. For this reason, if a certain amount of sprayed washer liquid is determined so that the windshield 2 can be optimally wiped with the minimum necessary, the wiping performance of the glass 2 can be improved. Unnecessary consumption can be further suppressed or prevented.

<Configuration of Second Embodiment>
FIG. 7 is a block diagram illustrating a control unit of the washer injection device according to the second embodiment of the present invention. However, in the control unit 19A shown in FIG. 7, the same parts as those of the control unit 19 shown in FIG. 3 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  The control unit 19A shown in FIG. 7 is different from the control unit 19 of the first embodiment in that the pump control pressure of the pump control unit 23A is higher in the forward movement than in the backward movement of the wiper arm 11. In addition, the discharge pressure of the washer pump 16 is controlled (referred to as high discharge pressure control).

  By the way, in the reciprocating operation of the arm 11, during the forward movement, the forward-side nozzle 13a ejects the washer liquid upward, and during backward movement, the backward-side nozzle 13b ejects the washer liquid downward. For this reason, assuming that the pump discharge pressure P is the same in both the reciprocating operations of the arm 11, the amount of washer fluid injected is reduced or the forward side of the windshield 2 is reduced during the forward movement than during the backward movement. The washer liquid cannot be sprayed to the position necessary for wiping. For this reason, at the time of forward movement, the malfunction of causing the fall of the wiping performance of the glass 2 may arise.

  Therefore, if the pump control unit 23A performs high discharge pressure control, it is possible to inject an appropriate amount of washer liquid at an appropriate position that does not cause a decrease in the wiping performance of the glass 2 even during forward movement. Become. At this time, in the backward-side nozzle 13b at the same height as during the reciprocation, the pump discharge pressure P is lower than that during the forward movement, but since it is ejected downward, the washer liquid necessary for wiping is ejected. It is possible to ensure the amount and inject the fuel to a position necessary for wiping.

  For discharge pressure height control, the pump control unit 23A includes height / discharge pressure correspondence table information (also referred to as table information) D3, and in addition to the nozzle height H from the nozzle height detection unit 22, the motor control unit 21 Control of the discharge pressure of the pump 16 is performed using the motor control signal as described below.

  The height / discharge pressure correspondence table information D3 includes two graph lines G3a and G3b of the nozzle height H and the pump discharge pressure P in the height / discharge pressure correspondence map (also referred to as a map diagram) shown in FIG. The relationship associated with each of these is represented by a data value. The map shown in FIG. 8 shows the nozzle height H on the horizontal axis as H1 (minimum height) to H1m (maximum height), and the pump discharge pressure P on the vertical axis increases from P1 (minimum discharge pressure). They are shown as Pbc, Pac, Pbk, Pak, Pbm, Pam (maximum discharge pressure) in this order.

  A graph line G3a illustrated in FIG. 8 represents the relationship between the nozzle heights H1 to H1m when the arm 11 moves forward and the pump discharge pressures P1, Pac, Pak, and Pam. This relationship indicates the discharge pressures P1, Pac, Pak, and Pam of the pump 16 when the washer liquid is injected from the forward-side nozzle 13a when the nozzle height is H1 to H1m.

A graph line G3b represents the relationship between the nozzle heights H1 to H1m when the arm 11 moves forward and the pump discharge pressures P1, Pbc, Pbk, and Pbm. This relationship indicates the discharge pressures P1, Pbc, Pbk, and Pbm of the pump 16 when the washer liquid is injected from the return-side nozzle 13b when the nozzle height is H1 to H1m.
Here, the pump discharge pressure P during forward movement is referred to as forward pump discharge pressure Pa, and the pump discharge pressure P during reverse movement is referred to as backward pump discharge pressure Pb.

  As can be seen from the graph lines G3a and G3b, at the nozzle heights H1 to H1m, the forward pump discharge pressures P1, Pac, Pak, and Pam are the return pump discharge pressures P1, Pbc, Pbk, and Pbm. Higher than. In this way, at the same nozzle height H, the amount of washer fluid ejected from the forward-side nozzle 13a during forward movement is greater than the amount of washer fluid ejected from the backward-side nozzle 13b during backward movement. It is determined to be.

  For example, it is assumed that the slope of the graph line G3b during backward movement is “1” and the slope of the graph line G3a during forward movement is “1.2”. Further, in this case, the relationship between the nozzle heights H1 to H1m and the return side pump discharge pressures P1, Pbc, Pbk, and Pbm according to the graph line G3b at the time of reverse movement is the amount of the washer liquid injected from the return side nozzle 13b. It is assumed that the injection amount is a constant amount of 1.5 cc / second. In this case, in the relationship between the nozzle heights H1 to H1m and the forward pump discharge pressures P1, Pac, Pak, and Pam according to the graph line G3a at the time of forward movement, the injection amount of the washer liquid injected from the forward side nozzle 13a is The fixed amount is 1.8 cc / second {= (1.5 cc / second) × 1.2}.

  Returning to FIG. 7, the pump control unit 23 </ b> A detects forward rotation control or reverse rotation control of the motor control signal from the motor control unit 21. If the detection result is the forward rotation control, it is determined that the arm 11 is moving forward, and the relationship between the nozzle height H and the forward pump discharge pressure Pa according to the graph line G3a (see FIG. 8) is referred from the table information D3. Choose to do.

  Thereafter, similarly to the first embodiment, the pump control unit 23A applies the nozzle height H detected by the nozzle height detection unit 22 to the relationship of the graph line G3a of the previously selected table information D3, The forward pump discharge pressure Pa is obtained. For example, if the nozzle height H is H1k shown in FIG. 8, the pump discharge pressure Pak is obtained via the graph line G3a. Thereafter, the pump control unit 23A performs control to set the discharge pressure of the pump 16 to the calculated forward pump discharge pressure Pak.

  On the other hand, when detecting reverse rotation control from the motor control signal, the pump control unit 23A determines that the arm 11 is moving backward, and from the table information D3, the nozzle height H based on the graph line G3b and the backward pump discharge pressure Pb are determined. Choose to see the relationship.

  Thereafter, the pump control unit 23A applies the nozzle height H detected by the nozzle height detection unit 22 to the relationship of the graph line G3b of the previously selected table information D3, and sets the return side pump discharge pressure Pb. Ask. For example, if the nozzle height H is H1c shown in FIG. 8, the pump discharge pressure Pbc is obtained via the graph line G3b. The pump control unit 23A performs control to set the discharge pressure of the pump 16 to the calculated forward pump discharge pressure Pbc.

<Operation of Second Embodiment>
Next, control of the discharge pressure of the washer pump 16 by the control unit 19A will be described with reference to the flowchart shown in FIG. However, in the flowchart shown in FIG. 9, the description of the same content as the flowchart shown in FIG. 6 of the first embodiment is omitted as appropriate.

  In step S11, similarly to step S1 (FIG. 6) described above, the arm 11 reciprocates integrally with the blade 12 and the nozzle 13 by the reciprocating drive of the motor 14 according to the motor control signal of the motor control unit 21. At this time, it is assumed that the washer liquid is ejected from the nozzle 13.

  By the reciprocation of the arm 11, in step S12, the nozzle height detection unit 22 detects the nozzle height H in the same manner as in step S2 (FIG. 6). Here, it is assumed that the nozzle height H1k or H1c {see FIG. 2 (a) or (b)} is detected and output to the pump control unit 23A.

  Next, in step S13, the pump control unit 23A detects forward rotation control or reverse rotation control of the motor control signal from the motor control unit 21, and in step S14, whether the arm 11 is moving forward or backward. Determine. If the forward movement is in the forward rotation control, the process proceeds to step S15, and if the backward movement is in the reverse rotation control, the process proceeds to step S19.

  If it is during the forward movement, in step S15, the pump control unit 23A selects the relationship of the graph line G3a during forward movement (see FIG. 8) from the table information D3.

  Next, in step S16, the pump control unit 23A applies the nozzle height H1k detected in step S12 to the relationship of the graph line G3a at the time of forward movement shown in FIG. 8 selected in step S15. The dynamic pump discharge pressure Pak is obtained.

  Next, in step S17, the pump control unit 23A controls the discharge pressure of the pump 16 to be the forward pump discharge pressure Pak obtained in step S16.

  With this control, in step S <b> 18, the pump 16 sucks the washer liquid from the tank 15 at the control forward pump discharge pressure Pak and discharges it to the pipe 18. The washer liquid discharged to the pipe 18 is sprayed onto the windshield 2 at a fixed amount of, for example, 1.8 cc / sec from the forward path side nozzle 13a.

  On the other hand, if the determination in step S14 is during backward movement, in step S19, the pump control unit 23A selects the relationship of the graph line G3b during backward movement (see FIG. 8) from the table information D3.

  Next, in step S20, the pump control unit 23A applies the nozzle height H1c detected in step S12 to the relationship of the graph line G3b in the backward movement shown in FIG. The dynamic pump discharge pressure Pbc is obtained.

  Next, in step S21, the pump control unit 23A controls the discharge pressure of the pump 16 to be the forward pump discharge pressure Pbc obtained in step S20.

  By this control, in step S18, the pump 16 sucks the washer liquid from the tank 15 and discharges it to the pipe 18 at the control return side pump discharge pressure Pak, and the washer liquid is discharged from the return side nozzle 13b, for example, 1.. It is sprayed onto the windshield 2 at a fixed amount of 5 cc / second.

<Effects of Second Embodiment>
In the washer injection device 10 according to the second embodiment described above, the washer nozzle 13 includes the forward path side nozzle 13 a that ejects when the wiper arm 11 moves forward, and the backward path side nozzle 13 b that sprays when the arm 11 moves backward. Then, the control unit 19A as the control means controls the discharge pressure of the washer pump 16 to be higher during the forward movement than during the backward movement of the arm 11.

  According to this configuration, when the arm 11 moves backward, the forward-side nozzle 13a injects the washer liquid upward, but the discharge pressure of the pump 16 is higher than when moving backward, so that the wiping performance of the windshield 2 is increased. It is possible to inject the washer liquid with an appropriate injection amount at an appropriate position so as to avoid the decrease in the amount. Thereby, the wiping effect of the glass 2 can be improved even when the arm 11 moves forward.

  Further, when the arm 11 is moved backward, the discharge pressure is lower than that during the forward movement, but since it is sprayed downward, a necessary amount of washer liquid for wiping can be sprayed to a position where deterioration of the wiping performance is avoided. it can. Accordingly, it is possible to suppress or prevent a decrease in wiping performance during forward movement and useless consumption of the washer liquid during backward movement.

<Configuration and Operation of Third Embodiment>
FIG. 10 is a perspective view of a vehicle using the washer injection device according to the third embodiment of the present invention.
As shown in FIG. 10, the washer injection device 10 </ b> B of the vehicle 1 is different from the washer injection device 10 (FIG. 1) of the first embodiment in that a viscosity detection sensor 17 is provided adjacent to the washer tank 15. 19B is that the discharge pressure of the pump 16 is controlled by using the nozzle height H and the viscosity [Pa · s (Pascal second)] of the washer liquid detected by the viscosity detection sensor 17. The viscosity detection sensor 17 is detection means described in claims, and is also simply referred to as a sensor 17.

  The viscosity of the washer liquid varies depending on its components. In addition, the viscosity of the washer liquid changes depending on the liquid temperature. The lower the temperature is, the higher the viscosity is, and the more difficult it is to flow. The higher the temperature is, the lower the viscosity is, and the easier it is to flow. When the pump 16 sucks the washer liquid from the tank 15 and injects it from the nozzle 13 through the pipe 18, if the viscosity is high, it becomes difficult to flow through the pipe 18 and the like and it is difficult to inject from the nozzle 13. In this case, the spray amount of the washer liquid is reduced, or the washer liquid is not sprayed to a position necessary for wiping the glass 2. For this reason, the malfunction of causing the fall of wiping performance may arise.

  Therefore, in the third embodiment, the viscosity of the washer liquid in the tank 15 is detected by the viscosity detection sensor 17, and the discharge pressure of the pump 16 is higher when the detected viscosity is lower than when the detected viscosity is low. Control to increase the value was made. However, the viscosity detection sensor 17 may detect the component of the washer liquid and obtain the viscosity from the correspondence between the temperature change and the viscosity change according to this component.

  The control unit 19B is different from the control unit 19 (FIG. 3) of the first embodiment in that the pump control unit 23B shown in FIG. 11 calculates a correction value α (see FIG. 12) from the viscosity η detected by the sensor 17. In other words, the pump discharge pressure P (see FIG. 5) is corrected with the correction value α. The pump control unit 23B further includes viscosity / correction value correspondence table information (also referred to as table information) D4.

  Viscosity / correction value correspondence table information D4 is a data value representing the relationship associated with the viscosity line η of the washer fluid η and the correction value α in the viscosity / correction value correspondence map (map diagram) shown in FIG. It is a representation. The map shows the viscosity η on the horizontal axis as ηd, ηj, and ηn in order of increasing from ηa, and the correction value α on the vertical axis as ηd, ηj, and ηn in ascending order from αa.

  The pump control unit 23B shown in FIG. 11 obtains the pump discharge pressure P by fitting the nozzle height H to the table information D2. Further, the pump control unit 23B obtains a correction value α by fitting the viscosity η of the washer fluid detected by the sensor 17 to the table information D4, and multiplies the previously obtained pump discharge pressure P by the correction value α. Thus, a corrected pump discharge pressure Pη (Pη is not shown) is obtained. Then, the pump control unit 23B controls the discharge pressure of the pump 16 to be the corrected pump discharge pressure Pη by a pump control signal including information on the corrected pump discharge pressure Pη.

  Here, it is assumed that the viscosity ηj shown in FIG. 12 is a standard viscosity of the washer liquid, and the correction value αj corresponding to the viscosity ηj is “1”. At this time, the correction value αn corresponding to the viscosity ηn higher than the standard viscosity ηj and difficult to flow is “1.3”, and the correction value αd corresponding to the viscosity ηd lower than the standard viscosity ηj and easy to flow is “ Assume that it is 0.8 ".

  In this case, if the viscosity ηn is detected by the viscosity detection sensor 17, the pump control unit 23B fits the viscosity ηn to the table information D4, and obtains the correction value αn = “1.3”. Further, the pump control unit 23B multiplies the pump discharge pressure (for example, P1k shown in FIG. 5) obtained by fitting the nozzle height H to the table information D2 by the correction value “1.3” to obtain the corrected pump discharge pressure. Pη = “P1k × 1.3” is obtained. Then, the pump control unit 23B performs control to set the discharge pressure of the pump 16 to the corrected pump discharge pressure “P1k × 1.3”.

  By this control, the discharge pressure of the pump 16 increases from “P1k” to “P1k × 1.3”. For this reason, even if the viscosity η of the washer liquid is higher than the standard viscosity ηj and difficult to flow, the washer liquid is sucked from the tank 15 by the pump 16 and is appropriately injected from the nozzle 13 via the pipe 18. It becomes possible.

  On the other hand, it is assumed that the viscosity ηd of the washer liquid in the tank 15 is lower than the standard viscosity ηj (FIG. 12), and in this case, the viscosity detection sensor 17 detects the viscosity ηd. The pump control unit 23B fits the viscosity ηd to the table information D4 to obtain the correction value αn = “0.8”. Further, the pump control unit 23B multiplies the correction value “0.8” by the pump discharge pressure (for example, P1k) obtained by fitting the nozzle height H to the table information D2, and the corrected pump discharge pressure Pη = “P1k × 0.8” is obtained. The pump control unit 23B performs control to set the discharge pressure of the pump 16 to the corrected pump discharge pressure “P1k × 0.8”.

  By this control, the discharge pressure of the pump 16 is lowered from “P1k” to “P1k × 0.8”. In this case, since the viscosity ηd of the washer liquid tends to flow lower than the standard viscosity ηj, even if the discharge pressure of the pump 16 is lowered, the washer liquid is properly injected through the pipe 18.

<Effect of the third embodiment>
The washer injection device 10B according to the third embodiment described above includes the viscosity detection sensor 17 as detection means for detecting the viscosity of the washer liquid in the washer tank 15, and the pump control unit 23B is detected by the viscosity detection sensor 17. The discharge pressure of the washer pump 16 is controlled to be higher when the viscosity η is higher than when the viscosity η is low.

  According to this configuration, the optimum pump discharge pressure P (corrected pump discharge pressure Pη) can be set according to the viscosity of the washer liquid. That is, when the viscosity of the washer liquid is high, it is difficult for the washer liquid to flow. However, by increasing the discharge pressure of the pump 16, the washer liquid can be injected onto the windshield 2 in an appropriate amount. Accordingly, it is possible to suppress or prevent a decrease in wiping performance.

  On the other hand, when the viscosity of the washer liquid is low, the washer liquid appropriately flows from the tank 15 to the nozzle 13 and is injected even if the discharge pressure of the pump 16 is low. For this reason, when the viscosity of the washer liquid is low, by reducing the discharge pressure of the pump 16, wasteful consumption of the washer liquid can be suppressed or prevented, and further, the driving power of the pump 16 can be suppressed. Can do.

  The control of the pump discharge pressure P by the pump control unit 23B of the washer injection device 10B of the third embodiment can be similarly applied to the pump control unit 23A of the second embodiment. In this case, the viscosity η of the washer fluid detected by the viscosity detection sensor 17 may be corrected by multiplying the forward pump discharge pressure Pa or the backward pump discharge pressure Pb.

<Modification>
As shown in FIG. 13, the wiper arm 11 is integrated with the wiper blade 12 and the washer nozzle 13 in accordance with the reciprocating motion between the start position T0 which is a substantially horizontal position and the end position T3 which is a substantially vertical position. Reciprocates. At this time, washer liquid is ejected from the forward path side nozzle 13a or the backward path side nozzle 13b. However, injecting the washer liquid at the end point position T3 during the forward movement of the arm 11 causes the washer liquid to be ejected to the outside of the windshield 2, so that the washer liquid is wasted.

More specifically, the length of the glass 2 is short between the end point vicinity position T2 close to the end point position T3 and the end point position T3, and most of the washer liquid jumps out of the glass 2. For this reason, injecting the washer liquid after the end point vicinity position T2 as before will be a waste of the washer liquid.
Such waste is the same for the starting point position T0 and the starting point vicinity position T1.

  Therefore, in the pump control unit 23 shown in FIG. 3, the pump control unit 23 </ b> A shown in FIG. 7, and the pump control unit 23 </ b> B shown in FIG. 11, the pump discharge pressure P depends on the arm angle θ obtained by the nozzle height detection unit 22. Control for lowering is performed as described later. Here, the pump control unit 23 shown in FIG. 3 will be described as a representative. The reciprocating operation of the arm 11 will be described on behalf of the forward movement side.

  For example, when the arm 11 moves forward, the pump control unit 23 detects the position of the arm 11 from the arm angle θ obtained by the nozzle height detection unit 22. The pump discharge pressure P is gradually decreased from the time when the detected position of the arm 11 reaches the end point vicinity position T2, and control is performed to “0” when the position reaches the end point position T3. In addition, the startup time of the washer liquid injection on the next backward movement side may be shortened by setting the value close to “0” other than “0”.

  In accordance with this control, the washer liquid ejected from the forward path side nozzle 13a gradually decreases from the end point vicinity position T2 and is not ejected at the end point position T3.

  More specifically, the end point vicinity position T2 is ideally a distance at which the washer liquid ejected from the forward path side nozzle 13a reaches the end point position T3. Accordingly, after the end point vicinity position T2, the pump control unit 23 controls the pump discharge pressure P so that the injection amount decreases while the washer liquid reaches the end point position T3 with the forward movement of the forward path side nozzle 13a. preferable.

  According to such control, the windshield 2 can be properly wiped while suppressing or eliminating washer fluid waste.

  In addition, the pump control unit 23 may perform control to set the pump discharge pressure P to “0” when the arm angle θ reaches the end point position T3 when the arm 11 moves forward.

1 vehicle 2 windshield (window glass)
DESCRIPTION OF SYMBOLS 10,10B Washer injection apparatus 11 Wiper arm 12 Wiper blade 13 Washer nozzle 13a Outbound side nozzle 13b Return path nozzle 13c Injection direction switching part 14 Wiper motor (motor of drive mechanism)
14a Rotation angle detection sensor (detection means)
15 Washer tank 16 Washer pump 17 Viscosity detection sensor 18 Pipe 19, 19A, 19B Control unit (control means)
21 Motor control unit 22 Nozzle height detection unit 23, 23A, 23B Pump control unit

Claims (6)

A wiper blade for wiping the window glass provided in the vehicle;
A wiper arm that supports the wiper blade;
A drive mechanism including a motor for displacing the wiper arm at least in the vertical direction;
A washer nozzle for injecting washer fluid onto the window glass;
A washer pump for supplying washer fluid to the washer nozzle;
Control means for controlling the discharge pressure of the washer pump;
With
The washer nozzle is provided on the wiper blade or the wiper arm,
The washer injection device, wherein the control means controls the discharge pressure of the washer pump to be higher when the position of the wiper arm is higher than when the position of the wiper arm is low. The control means includes a nozzle height detection unit that detects the height of the washer nozzle, and the amount of washer liquid ejected from the washer nozzle is constant regardless of the height of the washer nozzle. As described above, the storage means includes table information that defines the relationship between the discharge pressure of the washer pump and the height of the washer nozzle.
When the control means controls the discharge pressure of the washer pump to be higher when the position of the wiper arm is higher than when the position of the wiper arm is low, the control means detects the nozzle height detected by the nozzle height detection unit. The washer injection device according to claim 1 , wherein a pump discharge pressure is obtained by fitting to the table information, and the discharge pressure of the washer pump is controlled so as to be the obtained pump discharge pressure . The washer nozzle includes an outward-side nozzle that is ejected when the wiper arm is forwardly moved, and a backward-side nozzle that is ejected when the wiper arm is backwardly moved.
With
The washer injection device according to claim 1, wherein the control means controls the discharge pressure of the washer pump to be higher during forward movement than during backward movement of the wiper arm. A detection means for detecting the viscosity of the washer fluid;
The control unit controls the discharge pressure of the washer pump to be higher when the viscosity detected by the detection unit is higher than when the viscosity detected by the detection unit is low. The washer spraying device according to item 1. The control means performs control to gradually reduce the discharge pressure of the washer pump at the position of the wiper arm immediately before the washer liquid sprayed from the washer nozzle jumps out of the window glass. The washer injection device according to any one of claims 1 to 4. The said control means controls the discharge pressure of the said washer pump so that the washer liquid injected from the said washer nozzle stops at the starting position and the end position of the reciprocating operation of the wiper arm. The washer injection device according to any one of 5.

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