JPH0270557A - Washer device for vehicle - Google Patents

Abstract

PURPOSE:To reduce the coming down of the temperature of a washer liquid and melt effectively the ice frost of a wind shield, by making shorter distances between diffusion type nozzles and the wind shield. CONSTITUTION:A washer liquid is supplied from a washer tank 1 to a heating and warmth keeping device (a pot) 4. Next, the washer liquid which has been heated and kept warm by means of the heating and warmth keeping device 4, is diffused from nozzles 5 provided between the back surface of a bonnet and a wind shield 7, and jets toward the wind shield 7 is made, and the ice-frost of the wind shield 7 is melted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a washer device for a vehicle, and particularly to defrosting and deicing of front and side windshields.

[Conventional technology]

Conventionally, vehicle washer devices have been proposed that quickly defrost and remove ice by heating washer fluid using a heater, engine cooling water, etc., and injecting the high-temperature washer fluid onto the windshield. There is.

[Problem to be solved by the invention]

However, in conventional examples, a normal nozzle is used to spray washer fluid, or even if a diffusion type nozzle is used, the nozzle is installed on the bonnet or hood panel.

For this reason, the distance from the nozzle to the front windshield is long, and the diffuser nozzle has a different appearance.

Since it is small and restricted by running conditions, the sprayed particle size is also small. Therefore, the temperature drop from the time the washer liquid is injected from the nozzle to the time it reaches the windshield becomes large, resulting in a problem that a sufficient effect in melting ice and frost cannot be expected.

The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle washer device that can reduce the temperature drop of high-temperature washer fluid and effectively melt ice and frost on a windshield. .

- In order to achieve the above object, the washer device for a vehicle according to the present invention is provided with a washer fluid supplied from a washer tank, a heating and warming device that heats the washer fluid and keeps it warm, and a space between the back surface of the bonnet and the windshield. a diffusion type nozzle that is installed and that diffuses washer fluid heated and kept warm by the heating heat retention device and sprays it onto the windshield; and an injection control means for injecting washer fluid through the diffusion type nozzle.

[Effect]

According to the above configuration, since the diffusion type nozzle is installed between the back of the hood and the front windshield,
You can freely select the one that satisfies the required functions without being restricted by appearance, driving conditions, etc.

Furthermore, since the distance between the diffusion type nozzle and the windshield is shorter than in the conventional example in which the diffusion type nozzle is installed on the hood, the temperature drop of the washer fluid can be reduced. At this time, if a diffusion type nozzle with a large spray particle size is used, the temperature drop can be further reduced.

〔Example] Hereinafter, a first embodiment of the present invention will be described based on the drawings.

In Fig. 1, 1 is a washer tank, 2 is a washer pump for defrosting, 2' is a washer pump for normal washer, 3a, 3b, 3' are washer hoses, 4
5 is a heating and warming device (pot) for heating and keeping the washer liquid warm; 5 is a self-oscillating fluid dispersion nozzle for hot water as a diffusion nozzle; and 5' is a washer nozzle for cold water that is normally used. As described above, in this embodiment, during normal washer operation, the washer liquid in the washer tank 1 is directly injected from the cold water washer nozzle 5' by the washer pump 2'. On the other hand, when removing ice and frost from the windshield 7, the washer liquid in the washer tank l is heated by the bot 4, and then the washer pump 2 transfers it from the self-oscillating fluid spray nozzle 5 for hot water to the windshield 7. Sprays widely and evenly. At this time, the oil film adhering to the windshield 7 can also be removed by the high temperature washer fluid.

In this embodiment, as shown in FIG. 1, two self-oscillating fluid spray nozzles 5 are installed on the driver's seat side.
This makes it possible to quickly secure visibility on the driver's seat side.

At this time, of the two self-oscillating fluid spray nozzles 5 provided on the driver's seat side, one is large and the other is small to ensure that the washer fluid covers the entire area wiped by the wiper. can be injected.

Next, a vehicle mounting structure of the self-oscillating fluid spraying nozzle 5 in this embodiment will be explained.

In FIG. 6, a self-oscillating fluid dispersion nozzle 5 is mounted in a gap 14 between the back surface 13 of the bonnet (hood panel) and the windshield 7 by a stay 15 at a position where it does not interfere with the movement of the wiper. Installation is with stay 15
is made by bending two flat plates, and the bending angle can be changed freely. For attachment, the self-oscillating type fluid dispersion nozzle 5 is screwed to one end of the stay 15, and the other end is adhered to the bonnet a side 13 with adhesive.

In FIG. 2, reference numeral 6a denotes a heating control relay, which controls, for example, energization to a PTC ceramic heater 4C, which heats the washer fluid in the pond 4, in accordance with engine operating conditions. Further, 8 is a control circuit for the washer device, which drives the defrosting washer pump 2 for a predetermined period of time when the injection switch 11 is turned on when the vehicle is stopped. In addition, 3c is a check valve, and when the washer hose 3b cannot be placed lower than the lowest liquid level of the washer tank 1, it is installed in the middle of the path of the washer hose 3b. This can prevent the washer fluid from flowing backward and reducing the amount of washer fluid in the pot 4.

Next, a detailed sectional view of the pot 4 is shown in FIG.

In FIG. 3, a vacuum JW4a is formed by the inner casing 4j and the outer casing 4, both of which are made of stainless steel, thereby giving the pot 4 a heat insulating performance similar to that of a thermos flask.

Further, washer fluid is stored in the tank formed by the inner casing 4j, and its water storage capacity is approximately 200 ml.
It is set to cc. A hot water passage 41 is opened at the upper part of the tank, and a gas phase removal pipe 4h is attached to the tip thereof. The cross-sectional area of this gas phase removal pipe 4h is set to 1/3 or less of the cross-sectional area of the hot water passage 41 so as not to obstruct the flow of washer liquid in the hot water passage 41.

Further, the hot water passage 41 is made of a stainless steel pipe, and a central inner casing is attached around the pipe. Thereby, the hot water passage 41 is surrounded by a vacuum gap communicating with the vacuum layer between the double walls of the insulating tank. This prevents the heat of the hot water stored in the tank from escaping to the outside world via the hot water passage 41 that is thermally connected to the outside world.

The cold water passage 4n is a tube made of the same material as the hot water passage 42, and one end thereof opens at the bottom of the tank. Furthermore, the cold water passage 4m is provided with a passage extension that loops along the outer periphery within the bottom double wall space of the tank.

A baffle plate 4g attached to the central inner casing is provided above the opening of the cold water passage 4m to the tank bottom. This baffle plate 4g functions to weaken the force of the low-temperature washer fluid supplied into the tank by the washer pump 2 through the cold water passage 4m. Thereby, when the washer pump 2 supplies low-temperature washer fluid, the temperature drop of the high-temperature washer fluid discharged from the hot water passage 41 to the outside due to the discharge pressure of the low-temperature washer fluid can be reduced.

At the bottom of bot 4, there is a 4m cold water passage and 3 washer hoses.
A circulation path 4n that communicates with the washer hose 3b, a circulation path 4p that communicates the hot water passage 42 with the washer hose 3b, and a circulation path 4q that communicates these circulation paths 4n and 4p are provided.

In addition, in this embodiment, the above-mentioned circulation paths 4n, 4p, 4q are made of members made of synthetic resin with low thermal conductivity.
is formed.

A heater block 4d is arranged in the middle of the circulation path 4p. This heater block 4d is made of a material with high thermal conductivity, such as aluminum or copper, and is heated by a heater 4C bonded to the heater block 4d. At this time, a temperature switch 41 such as a thermal reed switch is disposed in the heater block 4d, and the temperature of the washer fluid is determined by this temperature switch 41. Then, when the liquid temperature determined by the temperature switch 4i becomes high and there is a risk that the washer liquid will boil, the heating control relay 6a cuts off the power supply to the heater 4c.

In this way, the bot 4 heats and keeps the washer fluid within a range where the washer fluid does not boil. Furthermore, a normally open ball valve 4e and a reverse convection prevention valve 4r are incorporated in the circulation path 4q, as shown in FIG. 3.

The operation of the washer device configured as described above will be explained.

In Figure 3, when the engine is in operation,
The heater 4C is energized. At this time, the washer pump 2 was installed in the tank when the washer was used last time.
As a result, the washer tank 1 is filled with low-temperature washer fluid supplied from the washer tank 1. Heater 4C
As heat is generated, the low-temperature washer fluid is rapidly heated by the heater block 4d disposed in the circulation path 4p, and its specific gravity becomes lighter, and it rises in the hot water path 4i as shown by the solid line arrow in the figure. go. As a result, an amount of low-temperature washer fluid commensurate with this increased amount of hot water is pumped by gravity and the rising pressure of the hot water from inside the tank through the cold water passage 4m at the bottom of the tank and into the circulation path 4n→4q→4p as shown by the solid line arrow in the figure. new washer fluid is replenished into the circulation path 4p. Since this replenished washer fluid is also heated and rises in the hot water passage 41, such a convection phenomenon continues until it reaches the maximum temperature that can be heated by the heater 4c. At this time, the temperature of the washer fluid is determined by a temperature switch 41 disposed in the heater link 4d, and the heater 4 is turned on to prevent the washer fluid from boiling.
energization to c is controlled. The heating of the washer fluid by the heater 4c ends when the engine stops, but since the bot 4 is vacuum insulated, the heated washer fluid is kept at a high temperature for approximately half a day to one day. .

Here, during the above-mentioned heat retention, the reverse convection prevention valve 4f moves downward in FIG. 3 to prevent reverse convection from the circulation path 4p to the convection ring path 4q.

In addition, in FIGS. 2 and 3, the washer pump 2
The low-temperature washer fluid sent out from the washer tank 1 by the action of the washer fluid reaches the junction between the circulation paths 4n and 49 via the washer hose 3a. At this time, the ball valve 4e
moves to the position shown by the dotted line in FIG. 3, cutting off communication from the washer hose 3a to the circulation path 4q. Therefore, the low-temperature washer fluid passes through the circulation path 4n, passes through the bottom of the tank, and flows into the cold water path 4m communicating with the inside of the tank.

Therefore, the discharge pressure by the washer pump 2 is applied to the high temperature washer fluid filling the tank. As a result, the hot washer fluid in the tank is transferred to the hot water passage 42 as shown by the dotted line arrow in the figure. It is sent to the self-oscillating type fluid dispersion nozzle 5 via the circulation path 4p and the washer hose 3b.

Here, since the self-oscillating type fluid dispersion nozzle 5 is attached to the gap between the back surface of the bonnet and the windshield 7, it is not visually noticeable and the spraying distance to the windshield 7 can be shortened. By shortening the spraying distance, the temperature drop of the washer fluid can be reduced, but in this embodiment, a self-oscillating type fluid dispersion nozzle 5 is also used as a diffusion type nozzle. The self-oscillating fluid spraying nozzle 5 sprays a jet stream by swinging it from side to side. Among nozzles that spray a wide range of fluids, the droplet diameter is relatively large at 1 to 2 mm. It has the effect of having a small temperature drop during flight and high thawing efficiency.

Furthermore, in order to inject the washer fluid to an appropriate position in the wiper wiping area 4 of the windshield 7, it is necessary to adjust the mounting direction of the self-oscillating fluid spray nozzle 5.
This is done by adjusting the bending angle of the stay 15.

Furthermore, the self-oscillating fluid dispersion nozzle 5 can be easily attached to a vehicle in any type of vehicle, even if it is retrofitted.

Here, hot water passage 4! The gas phase removal tube 4h attached to the tip of the gas phase removal tube 4h will be explained.

In the bot 4, heating by the heater 4c causes vaporization of the air contained in the washer liquid and evaporation of the alcohol component, and a gas phase is generated in the upper part of the tank as shown in FIG. Here, when the gas phase removal pipe 4h is not present and the hot water passage 4°C opens near the top wall surface, the gas phase immediately spreads to the open end surface of the hot water passage 42, and the convection phenomenon for heating the washer fluid stops. Resulting in. In addition, hot water passage 4
If the opening end face of ρ is set low, the gas phase accumulated in the upper part of the tank when hot water washer fluid is injected cannot be removed. For this reason, even if the opening end surface of the hot water passage 41 is lowered, the effect of lowering the opening end surface of the hot water passage 42 is diminished because a gas phase that cannot be removed is spread in the upper part of the tank.

Therefore, the opening end face of the hot water passage 41 must be made lower than necessary, which may deteriorate heat retention due to an increase in conductive heat radiation through the hot water passage 42, or may deteriorate heat retention when low temperature washer fluid flows in due to vapor phase contraction. This will lead to deterioration. moreover,
If the opening end surface of the hot water passage 41 is lowered, a problem arises in that the amount of high-temperature washer fluid to be sprayed when the washer fluid is sprayed is reduced.

In this embodiment, since the gas phase removal pipe 4h is provided at the tip of the hot water passage 42, when the pressure inside the hot water passage 4N is reduced due to the flow of the washer liquid when the washer liquid is injected, the upper part of the tank The gas phase is sucked into the hot water passage 4N via the gas phase removal pipe 4h, and is discharged together with the high temperature washer fluid. Therefore, according to the present embodiment, it is possible to prevent the heating of the washer fluid from being stopped due to the gas phase spreading in the upper part of the tank without setting the opening end surface of the hot water passage 42 lower than necessary.

Next, a control circuit 8 that controls the operation of the washer device described above.
I will explain about it.

FIG. 4 is a block diagram of the control circuit 8.
is an ignition switch IC, and a predetermined time injection circuit 8
a, a running operation stop circuit 8b, a washer motor 2a, and a relay switch 12.

FIG. 5 is a specific circuit diagram of the block diagram shown in FIG. 4.

In Figure 5, 80 is Toshiba product number TC4528B P/
B F IC, external resistor R4 and external capacitor C
This is a monostable multi-bibreak in which the output monostable pulse width is determined by a time constant of 4. The output from monostable multivibrator 8c is applied from output terminal Q to the base of transistor TI via resistor R1. The transistors T and T2 are connected in a Darlington manner to stabilize the voltage applied to the relay coil. Further, the control circuit 8 includes resistors R, , Rt, R3, capacitors cl, cL cff, and diodes L, Zz.

The operation of the above configuration will be explained. The running operation stop circuit 8b consists of a parking brake switch,
When the parking brake switch is closed, that is, when the vehicle is stopped, the relay coil of the relay switch 12 can be energized. When the injection switch 11 is closed with the ignition switch IC turned on and the parking brake switch closed, the input terminal B changes from the H level to the L level. Then, since the input terminal A is set to L level in advance, the monostable multipulp plater 8c outputs an output pulse from the output terminal Q with a pulse width determined by the resistor R4 and the capacitor C4. For this reason, the transistor T,
and T2 is turned on for a predetermined period of time, during which current flows through the relay coil and the relay switch 12 closes.

While the relay switch 12 is closed, the washer motor 2a is driven and the washer pump 2 injects washer fluid.

In the washer device of this embodiment, one operation is performed once.
Since an injection amount of 00 cc to 200 cc is required, if the washer fluid is injected only while the injection switch 11 is turned on, the operation may feel troublesome. In this respect, in this embodiment, when the -degree injection switch 11 is turned on, the washer fluid is continuously injected for a predetermined time corresponding to the required injection amount. This improves the operability of the washer device according to this embodiment.

Next, a second embodiment of the present invention will be described using FIGS. 7 and 8.

In the second embodiment, the high temperature washer fluid is also injected to the side windshield 17, so that not only the front windshield 7 but also the side windshield 17 are de-frosted and de-frosted. Here, the same components as in the first embodiment are denoted by the same numbers, and the explanation here will be omitted.

In FIG. 7, 18 is a self-oscillating type fluid dispersion nozzle for the side window, which is attached to the door mirror. Reference numeral 19 is a three-way solenoid valve, and the flow direction of the washer fluid is switched by a mode changeover switch 21 provided near the driver's seat. A limit switch 20 is used to confirm that the side windshield 17 is closed.

In the above configuration, the operation will be explained using FIG. 8.

When the mode changeover switch 21 is set to the front windshield side with the ignition switch IC turned on, the washer pump 2 is driven and high temperature washer fluid is injected onto the front windshield 7. on the other hand,
When the mode selector switch 21 is switched to the side window side, and the two limit switches 20 are both closed, the washer pump 2 and the three-way solenoid valve 19 are driven to inject high-temperature washer fluid to the side windshield 17. be done.

In the above embodiment, the washer pump 2 for defrosting and the normal washer pump 2' were respectively provided, but as shown in FIGS. 9 and 10,
The washer pump 2 may be shared. In FIG. 9, a three-way solenoid valve 22 is installed on the downstream side of the bot 4 to inject high-temperature washer fluid even during normal times, and in FIG. 10, a three-way solenoid valve 22 is installed on the upstream side of the bot 4. It is configured to spray low-temperature washer fluid under normal conditions.

In addition, as shown in FIG. 3, the gas phase removal tube 4h in the above-mentioned embodiment has one end portion of the gas phase removal tube 4h connected to the hot water passage 41! It was attached by gluing it to a part of the opening tip of the . However, Fig. 11(a), (
As shown in b), the gas phase removal pipe 4h and the hot water passage 4i! ,
They may be fitted and fixed. In particular, in the structure shown in FIG. 11(b), the convection of the washer fluid caused by heating by the heater 4C is not obstructed by the gas phase removal tube 4h at all.

Further, in the above-described embodiment, the self-oscillating fluid dispersion nozzle 5 is attached by bonding one end of the stay 15 to the bonnet surface a 13 with an adhesive. However, the first
As shown in FIG. 2, the self-oscillating fluid dispersion nozzle 5 may be mounted using a stay 23 with one end having a U-shape.

At this time, the stay 23 is attached so that its U-shaped tip is hooked onto the flat part 16b of the bonnet end, and the stay 23 is pressed onto the plate 2.
4 and tightening bolt 25 to secure the bonnet end flat part 16b.
It has a structure in which the mounting stay 23 is fixed by sandwiching it. Note that the direction of the self-oscillating fluid dispersion nozzle 5 is adjusted by adjusting the bending angle of the mounting stay 23. Furthermore, as shown in FIG. 13, the self-fluid spray nozzle 5 and the metal pipe 26 through which the washer fluid passes can be connected, and the pipe 26 can be attached to the stay 27 by bonding it to the bonnet surface a. good. At this time, the direction adjustment of the self-oscillating fluid spray nozzle 5 is performed using the pipe 26.
This is done by adjusting the bending angle.

Further, in the above embodiment, two self-oscillating fluid spraying nozzles are provided only on the driver's seat side, but of course two self-oscillating fluid spraying nozzles may also be provided on the passenger seat side.

However, the shape of the self-oscillating fluid dispersion nozzle.

The number of attachments may be appropriately determined depending on the shape of the vehicle and the performance of the washer device (particularly the piping from the washer pump and washer tank to the self-oscillating fluid dispersion nozzle).

[Effects of the Invention] As explained above, according to the present invention, it is possible to reduce the temperature drop of the high-temperature washer fluid, and therefore it is possible to effectively melt ice and frost on the windshield.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing how the first embodiment of the present invention is mounted on a vehicle, Fig. 2 is a schematic diagram showing the configuration of the first embodiment, and Fig. 3 is a heating in the first embodiment. 4 is a block diagram of the control circuit of the first embodiment, FIG. 5 is a specific circuit diagram of the block diagram shown in FIG. 4, and FIG. 6 is a diagram of the first embodiment. The installation diagram of the self-oscillating type fluid dispersion nozzle shown in FIG.
FIG. 8 is a control circuit diagram of the second embodiment; FIGS. 9 and 10 are configuration diagrams showing the configuration of other embodiments; FIG. 11(a) , (b) is a sectional view showing the structure of another embodiment of the gas phase removal pipe of the first embodiment, and FIG. An example of installation is shown in Figure 13 (a).
) and (c) are a front view and a side view showing the structure of another embodiment of the mounting stay of the first embodiment. 1... washer tank, 2... washer pump for defrosting, 4... heating and insulation device (pot), 5...
Self-oscillating fluid spray nozzle.

Claims (2)

[Claims] (1) Washer fluid is supplied from the washer tank,
A heating and warming device that heats and keeps the washer fluid warm; and a diffusion nozzle that is installed between the back side of the bonnet and the windshield and that diffuses the washer fluid heated and kept warm by the heating and warming device and sprays it onto the windshield. and an injection control means for supplying washer fluid from the washer tank to the heating and heat-retaining device and injecting the washer fluid from the heating and heat-retaining device through the diffusion nozzle. . (2) The heating and heat-retaining device has a double-wall structure of an inner wall and an outer wall, and includes a tank in which a vacuum layer is formed between the inner wall and the outer wall, and a tank that penetrates the bottom of the tank. one end of which opens at the upper part of the space surrounded by the inner wall, the other end of which is a hot water passage protruding outside the tank, and one end of the hot water passage which opens at the upper part of the space. a gas phase removal pipe that is installed in the tank and opens near the top wall surface in the space; and a cold water pipe that is installed through the inner and outer walls of the bottom of the tank to guide washer fluid from the washer tank into the tank. a passage, and a heater provided outside the tank to heat washer fluid in the tank, and when heated by the heater, the washer fluid is heated by convection circulating through the hot water passage and the cold water passage. 2. The vehicle washer device according to claim 1, wherein the vehicle washer device is heated.