Water-repellent coating applying system

Abstract

An exemplary system for applying a water-repellent coating to the outside of a window of a vehicle includes at least one reservoir for a hydrophobic fluid, at least one wiper with a wiper blade, and a control device. A first line leads from the reservoir to the wiper. The first line extends at least over part of the length of the wiper and has, in the region of the wiper blade, at least one opening by way of which the hydrophobic fluid can be applied to the window. An exemplary method for applying a water-repellent coating to a window of a vehicle, includes, among other things, determining a status of the water-repellent properties of the window with reference to a threshold value of a quantity of water on the outer-facing surface of the window, transmitting a signal from the control device to initiate a communicating of a hydrophobic fluid from a reservoir to a wiper when the status indicates that the quantity of water on the window has reached the threshold value, communicating hydrophobic fluid from the reservoir to the wiper, distributing hydrophobic fluid on the window by means of a movement of the wiper.

Claims

1. A system for applying a water-repellent coating to the outside of a window of a vehicle, comprising: a first reservoir that holds a hydrophobic first fluid; a second reservoir that holds a second fluid that is sprayed onto the window, the second fluid different than the hydrophobic first fluid; a wiper with a wiper blade; a control device; and at least one sensor arranged in the region of the window and operably connected to the control device, the at least one sensor configured to measure a water-repellent behavior of an outer-facing surface of the window; a first line that leads from the first reservoir to the wiper, wherein the first line extends at least over part of a length of the wiper and has, in a region of the wiper blade, at least one opening by way of which the hydrophobic first fluid can be applied to the window, wherein the control device is configured to adjust a flow of the hydrophobic first fluid to the wiper in response to feedback from the at least one sensor.

2. The system of claim 1, wherein a wiper arm of the wiper has a hollow profile configured to receive the first line and configured to communicate the hydrophobic first fluid to the wiper blade.

3. The system of claim 2, wherein the hollow profile is divided into a first tube and a second tube, the first tube configured to receive the first line, the second tube configured to receive a second line leading from the second reservoir to the wiper, the second line configured to communicate the second fluid to the wiper blade.

4. The system of claim 3, wherein the first tube extends parallel to the second tube.

5. The system of claim 3, further comprising at least one first pump that pumps the hydrophobic first fluid through the first line from the first reservoir to the wiper, and at least one second pump that pumps the second fluid through the second line from the second reservoir to the wiper.

6. The system of claim 1, wherein the wiper blade comprises a nanocoating.

7. The system of claim 1, wherein the at least one sensor is a rain sensor.

8. A motor vehicle comprising the system of claim 1.

9. The system of claim 1, wherein the second fluid is water.

10. The system of claim 1, wherein the wiper blade has a lip and a base portion, the lip configured to direct contact the window, wherein the first line is split into two first sub-lines in the region of the wiper, wherein the sub-lines extend along the wiper blade on both sides of the lip.

11. The system of claim 10, wherein the first line from the first reservoir connects to a hollow profile in the wiper arm.

12. The system of claim 10, wherein the at least one opening includes a plurality of openings, the plurality of openings arranged in multiple rows.

13. The system of claim 10, further comprising a second line that leads from the second reservoir to the wiper.

14. A water-repellent coating system, comprising: a first reservoir holding a first fluid; a second reservoir holding a different, second fluid, wherein the first fluid is a hydrophobic fluid; a wiper with a wiper blade and a wiper arm; a line from the first reservoir that connects to a hollow profile of the wiper arm; a control device that selectively commands a first pump to communicate the first fluid from the first reservoir to a window of a vehicle through at least one opening in a region of the wiper blade, and that selectively commands a second pump to communicate the second fluid from the second reservoir as spray onto the window, wherein the second pump communicates the second fluid from the second reservoir through at least one opening in the region of the wiper blade; and at least one sensor configured to measure a water-repellant behavior of an outer-facing surface of the window, the control device configured to adjust a flow of the first fluid to the wiper in response to feedback from the at least one sensor.

15. The water-repellent coating system of claim 14, wherein the wiper blade has a lip and a base portion, the lip configured to directly contact the window, wherein the first line is split into two first sub-lines in the region of the wiper, wherein the sub-lines extend along the wiper blade on both sides of the lip.

16. The water-repellent coating system of claim 14, wherein the second fluid is water.

17. The water-repellent coating system of claim 14, wherein the at least one opening includes a plurality of openings, the plurality of openings arranged in multiple rows.

18. The water-repellent coating system of claim 14, wherein the line is a first line and the hollow profile is a first hollow profile, and further comprising a second line from the second reservoir that connects to a second hollow profile in the wiper arm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic illustration of an exemplary embodiment of the system;

(2) FIG. 2 is a schematic illustration of a detail of the embodiment according to FIG. 1;

(3) FIG. 3a is a schematic illustration of a cross-section through a wiper arm;

(4) FIG. 3b is a schematic illustration of a cross-section through a wiper arm;

(5) FIG. 4 is a flow diagram corresponding to a method of the system.

DETAILED DESCRIPTION

(6) Referring to FIG. 1, a system 1, according to an exemplary non-limiting embodiment of this disclosure comprises a reservoir 2 for a hydrophobic fluid 2a, a wiper 3, a first line 4 for transporting the hydrophobic fluid from the reservoir 2 to the wiper 3, and a first pump 5, which is arranged in the first line 4.

(7) The first line 4 extends over the entire length of the wiper 3. There can, however, also be more than one wiper, e.g., two. In this example, the wiper 3 is arranged in the region of a window, such as a windshield 6, of a motor vehicle.

(8) The system 1 furthermore has a control device 7, which controls the first pump 5. The reservoir 2, the first pump 5, and the control device 7 are arranged in the region of the engine compartment of a motor vehicle. At least one sensor 8, which is designed to detect moisture, particularly rainwater, is furthermore arranged on the windshield 6.

(9) Referring now to the detailed view of FIG. 2 with continuing reference to the system of FIG. 1, the wiper 3 has a wiper blade 9, which is mounted on a wiper arm 10. The wiper blade 9 has a lip 9a and a base portion 9b.

(10) The first line 4 can be spilt into two sub-lines 4a and 4b in the region of the wiper 3 so that the sub-lines 4a, 4b extend on both sides of the lip 9a of the wiper blade. The first line 4 has a number of openings 11 in the region of the wiper 3. These openings 11 serve to apply hydrophobic fluid from the first line 4 to the windshield 6. The diameters of the openings 11 are variably adjustable. The openings in the first line 4 or in the sub-lines 4a, 4b can be arranged in multiple rows, e.g. two rows. In addition, a further line for spray water can also be arranged on the wiper 3.

(11) As illustrated by the arrows in FIG. 2, a hydrophobic fluid 2a is applied from the sub-lines 4a, 4b to the windshield 6. The applied fluid is distributed over the surface of the windshield 6 by means of the movement of the wiper 3.

(12) Referring now to FIG. 3a with reference to FIGS. 1 and 2, a cross-section of a wiper arm 10 shows an exemplary embodiment of the wiper arm 10 with a tubular hollow profile 10a. The first line 4 here either extends through the hollow profile 10a or is connected to the hollow profile 10a in such a way that the first line 4 leads into the hollow profile. Analogously to the first line 4, the hollow profile has openings (not shown) to transfer hydrophobic fluid 2a to the wiper blade 9.

(13) Referring to FIG. 3b with reference to FIGS. 1 and 2, a cross-section of a wiper arm 10 shows another exemplary embodiment of the wiper arm 10 in which the hollow profile is divided into a first tube 10b and a second tube 10c. The first tube 10b extends parallel to the second tube 10c in this example.

(14) The first tube 10b here is provided for receiving, or for connection to, the first line 4, and the second tube 10c for receiving, or for connection to, a second line 12 which is designed to conduct water, which is to be sprayed onto the window, from a water reservoir 13. A second pump 14 is arranged in the second line 12.

(15) Referring now to FIG. 4 with reference to FIGS. 1 and 2, an exemplary method of applying a water-repellent coating begins at a first step S1. The water-repellent coating can also be described as a water-repellent film on account of its nature.

(16) In the first step S1, a status of the water-repellent properties of the windshield 6 is determined. The status is identified with reference to a defined threshold value which relates to the quantity of water on the windshield. To this end, the water-repellent behavior of the outer-facing surface of the windshield 6 is measured by the sensor 8. The water-repellent behavior can be tested with water from rainfall and/or snowfall and/or road wetness, for example, or from spray water applied to the windshield 6 from the water reservoir 13.

(17) Generally, the threshold value relates to a quantity of water that clings to the window without rolling off. Exceeding the threshold value here means that water remains on the window in a quantity which impairs visibility through the window and the water-repellent properties of the window are therefore deemed inadequate. Below the threshold value, the water-repellent properties are deemed adequate. The quantity of water is measured by sensors arranged on the window. To this end, a certain quantity of water is sprayed from the water reservoir onto the window by way of the second line to determine whether the water-repellent coating is adequate for reducing the quantity of water on the windshield to below the threshold value.

(18) If the threshold value is reached or exceeded, the method moves to a second step S2 where a signal is transmitted from the control device 7 to the first pump 5 to transport hydrophobic fluid 2a from the reservoir 2 to the wiper 3.

(19) Next, in a third step S3, hydrophobic fluid 2a is pumped from the reservoir 2 to the wiper 3. The hydrophobic fluid 2a passes through the openings 10 here from the first line 4 or the sub-lines 4a, 4b to the windshield 6.

(20) Afterwards, in a fourth step S4, the hydrophobic fluid 2a is distributed on the windshield 6 by means of a typical back and forth movement of the wiper 3. The movement of the wiper 3 is continued until the hydrophobic fluid 2a has been distributed on the windshield 6 and the visibility through the windshield 6 is clear.

(21) The steps S1 to S4 can be repeated until the quantity of water on the windshield 6 falls below the threshold value again. To this end, to detect whether the water-repellent coating is adequate for reducing the quantity of water on the windshield 6 to below the threshold value, a certain quantity of water is sprayed onto the window from the reservoir 13 by way of the second line 12.

(22) The method of FIG. 4 can be carried out while the vehicle is not in a moving state, i.e., stationary. The method can be repeated at any time if the quantity of water on the windshield 6 exceeds the threshold value again.

(23) In an exemplary embodiment of the method, the openings 11 for applying the hydrophobic fluid 2a are adjusted to their largest possible size so that a quantity of hydrophobic fluid 2a with which a water-repellent film can be formed on the windshield 6 is applied to the windshield 6 in as short a time as possible. The water-repellent film formed here can furthermore be formed with as great a thickness as possible in as short a time as possible so that the water-repellent effect lasts for longer.

(24) In a further embodiment of the method, the openings 11 for applying the hydrophobic fluid 2a are adjusted to their smallest possible size to restrict consumption when the reserves of hydrophobic fluid 2a in the reservoir 2 are relatively low.

(25) For purposes of this disclosure, the term water-repellent is used as an adjective in connection with surfaces; and the term hydrophobic in connection with substances which impart the water-repellent effect. The term vehicle refers, in the wider sense, to all possible vehicles including aircraft and rail vehicles; however, in the narrower sense, particularly to motor vehicles for road travel. The term window refers, in the wider sense, to all windows of a vehicle; in the narrower sense, predominantly to the windows of a vehicle which are equipped with a wiper and therefore particularly to a windshield of a motor vehicle, but also, for example, to a rear window of a motor vehicle.

(26) Features of some of the examples of this disclosure include a hydrophobic material that can be applied to the window in a controlled manner when required, that is to say when the water-repellent effect of the window does not correspond to a set value, which is predefined. By carrying out the application by way of the wiper, it is not necessary to laboriously apply a water-repellent coating to the window manually. Furthermore, it is advantageously possible to conveniently refill hydrophobic fluid by way of the reservoir.

(27) As a hydrophobic fluid for forming a water-repellent film on the window, it is possible to use any fluid which is suitable for application to a glass window and forms a film thereon. Commercially available hydrophobic fluids which can also be applied by hand to a glass window, particularly to a window of a motor vehicle, are suitable. An ethanol-based fluid can be used. This can advantageously also be used at temperatures below zero without the fluid freezing and needing to be warmed up before being applied.

(28) The preceding description is exemplary rather than limiting in nature. Variations and modifications to the disclosed examples may become apparent to those skilled in the art that do not necessarily depart from the essence of this disclosure. Thus, the scope of legal protection given to this disclosure can only be determined by studying the following claims.