CN210734092U - Rainfall sensing device of automatic windshield wiper system - Google Patents
Rainfall sensing device of automatic windshield wiper system Download PDFInfo
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- CN210734092U CN210734092U CN201921325939.XU CN201921325939U CN210734092U CN 210734092 U CN210734092 U CN 210734092U CN 201921325939 U CN201921325939 U CN 201921325939U CN 210734092 U CN210734092 U CN 210734092U
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Abstract
The application discloses automatic rainfall sensing device of windshield wiper system includes: a housing; the silica gel pad is tightly attached to the windshield on the opening side of the shell; the light path input end of the main receiving end lens and the light path output end of the main transmitting end lens are tightly attached to the silica gel pad in the shell; a main light receiving member at an optical path output end of the main receiving end lens; the main LED is arranged at the light path input end of the main emitting end lens; a PCB board electrically connected to the main light receiving member and the main LED; the PCB board is fixed on the shell. The light of the main LED is collimated into parallel light by the main transmitting end lens, the light signal intensity of the raindrop sensing area is improved, and meanwhile, the light transmission loss is reduced through total reflection transmission of the main transmitting end lens and the main receiving end lens, so that the sensing accuracy of the rainfall condition on the surface of the car window is improved.
Description
Technical Field
The application relates to the technical field of rainfall automatic detection, in particular to a rainfall sensing device of an automatic windshield wiper system.
Background
In rainy days, the driving sight of a driver can be influenced by the raindrop to a great extent, the response capability of sudden accidents and the driving safety are reduced, and great potential safety hazards exist for the automobile driving in the rain. Therefore, most of the middle and high-end automobiles are provided with an automatic windshield wiper system for automatically detecting the rainfall at present. An automatic wiper system generally uses an optical sensor to detect the amount of rain and then automatically adjusts the speed of the wiper according to the amount of rain.
Optical sensors operate on the principle of refraction of light. In the optical sensor, there is a light emitting diode which emits a cone-shaped light beam which passes through a front windshield. When the windshield is dry without rain, almost all light is reflected onto one optical sensor; when it rains, rainwater is present on the windshield, and a part of the light deviates, which causes a change in the amount of light received by the sensor, thereby detecting the presence of rainwater.
In order to avoid the problem that the receiving of the reflected light is influenced by the different incidence angles of the conical light, in the prior art, the rainfall condition on the surface of the car window is detected through infrared rays, when a wire harness of the infrared rays receives the influences of raindrops, fog, snow, liquid foreign matters and the like, an infrared ray receiving signal changes along with the influence, if the change of the infrared ray receiving signal is not large, the rainfall outside is not large, and if the change of the infrared ray receiving signal is large and frequent, the rainfall outside is large. Because the temperature in the car can influence the emission of infrared rays, the rainfall sensor in the prior art can not accurately reflect the rainfall condition on the surface of the car window.
Disclosure of Invention
In view of this, the present application provides a rainfall sensing device of an automatic windshield wiper system, and mainly aims to solve the problem that a rainfall sensor in the prior art cannot accurately reflect the rainfall condition on the surface of a vehicle window.
According to an aspect of the present application, there is provided a rainfall sensing device of an automatic wiper system, including:
a housing;
the silica gel pad is tightly attached to the windshield on the opening side of the shell;
the light path input end of the main receiving end lens and the light path output end of the main transmitting end lens are tightly attached to the silica gel pad in the shell;
a main light receiving member at an optical path output end of the main receiving end lens;
the main LED is arranged at the light path input end of the main emitting end lens;
a PCB board electrically connected to the main light receiving member and the main LED;
the PCB board is fixed on the shell.
Furthermore, the main transmitting end lens comprises a first convex lens, a first total reflection surface and a first special-shaped prism group, and the main receiving end lens comprises a second special-shaped prism group, a second total reflection surface, a third total reflection surface and a second convex lens.
Further, the prism faces of the first shaped prism group and the prism faces of the second shaped prism group are mirror symmetric with respect to a central tangent plane of the housing along a direction perpendicular to the windshield.
Further, an included angle between the first total reflection surface and the first special-shaped prism group is 60 degrees.
Further, an included angle between the second total reflection surface and the second special-shaped prism group is 60 degrees, and an included angle between the third total reflection surface and the second special-shaped prism group is 90 degrees.
Further, the apparatus further comprises: the LED comprises a secondary LED, a secondary emitting end lens, a secondary receiving end lens and a secondary light receiving element;
the optical path input end of the auxiliary receiving end lens and the optical path output end of the auxiliary transmitting end lens are tightly attached to the silica gel pad in the shell;
the auxiliary light receiving element is arranged at the light path output end of the auxiliary receiving end lens;
the secondary LED is arranged at the optical path input end of the secondary emission end lens;
the PCB board is respectively and electrically connected with the auxiliary light receiving part and the auxiliary LED.
Further, the transmissivity of silica gel pad is the same with windshield.
Further, the PCB board comprises a switch, a power supply and a signal output end;
one end of the switch is connected with the main LED;
the other end of the switch is connected with the power supply;
the signal output end is connected with the main light receiving element.
Further, the signal output end is connected with an automatic windshield wiper system so as to control the brushing frequency of the windshield wiper.
Further, the material of the outer shell is a visible light impermeable material.
By means of the technical scheme, the technical scheme provided by the embodiment of the application at least has the following advantages:
the application provides an automatic rainfall sensing device of windshield wiper system utilizes main transmitting terminal lens to become the parallel light with main LED's light collimation, improves the light signal intensity of raindrop induction zone, and the total reflection through main transmitting terminal lens and main receiving terminal lens is propagated simultaneously, reduces the propagation loss of light to improve the response degree of accuracy to the door window surface precipitation condition.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic view illustrating a rainfall sensing device of an automatic wiper system according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating an optical transmission component according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of another optical path transmission component provided in an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating a light propagation at an emitting end according to an embodiment of the present disclosure;
fig. 5 is a schematic view illustrating a receiving-end light propagation provided by an embodiment of the present application;
FIG. 6 is a schematic diagram illustrating another optical transmission component provided in an embodiment of the present application;
FIG. 7 is a schematic diagram illustrating light transmission under different weather conditions according to an embodiment of the present application.
Description of the drawings: 1-windshield, 2-shell, 3-PCB board, 4-main receiving end lens, 41-second special-shaped prism group, 42-second total reflection surface, 43-third total reflection surface, 44-second convex lens, 5-main light receiving element, 6-main LED, 7-main emitting end lens, 71-first convex lens, 72-first total reflection surface, 73-first special-shaped prism group and 8-silica gel pad.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
An embodiment of the present application provides a rainfall sensing device of an automatic windshield wiper system, as shown in fig. 1, the device includes:
a housing 2;
a silica gel pad 8 closely attached to the windshield 1 on the opening side of the housing 2;
the light path input end of the main receiving end lens 4 and the light path output end of the main transmitting end lens 7 are tightly attached to the silica gel pad 8 in the shell 2;
a main light receiving element 5 at an optical path output end of the main receiving end lens 4;
a primary LED6 at the optical path input end of the primary emission end lens 7;
a PCB board 3 electrically connected to the main light receiving element 5 and the main LED 6;
the PCB board 3 is fixed to the housing 2.
The device produces the light source through PCB board 3 control owner LED6, and the light source changes light propagation direction through main transmitting terminal lens 7, generates the parallel light, and the parallel light reflects through windshield 1, gets into main receiving terminal lens 4, and main receiving terminal lens 4 changes light propagation direction again, assembles received light, exports through the light path output of main transmitting terminal lens, and the light receiving part 5 receives output light at last to receive optical signal and convert the received optical signal into the received signal of telecommunication. The PCB may directly output the received electrical signal, and may further include calculating a light source electrical signal of a light source signal of the main LED6 according to the power of the main LED6, calculating an intensity difference between the light source electrical signal and the received electrical signal, and finally outputting the intensity difference. The automatic windshield wiper system can judge the precipitation according to the strength of the received electric signal, and then control the starting and stopping of the windshield wiper and the speed of the windshield wiper.
As shown in fig. 7, after the parallel light passes through the windshield 1, a part of the light is lost in a refraction manner, and another part of the light enters the main receiving lens 4 in a reflection manner, when raindrops exist on the windshield, since the raindrops change the light propagation angle, the light entering the main receiving lens 4 in a reflection manner is reduced, that is, the light signal received by the main light receiving element 5 is weakened. Thus, the optical signal that can be received by the main light-receiving element 5 in the normal state of the windshield is the maximum optical signal that can be received, and after the rainfall sensing device is activated, the optical signal that is actually received by the main light-receiving element 5 is compared with the maximum optical signal to calculate the amount of precipitation.
The device forms a closed space through the shell 2 and the silica gel pad 8 so as to isolate the influence of space interferents such as visible light, dust, static electricity and the like on the rainfall sensing accuracy. The housing further comprises a fixing device for fixing the main receiving end lens 4, the main emitting end lens 7, the main light receiving part 5, the main LED6 and the PCB 3, wherein the fixing mode may be bolts, buckles, etc., which is not limited in this application. Silica gel pad 8, transparent and soft, other windshield 1 are closely laminated, can not have air gap and bubble for soft connection between main transmitting terminal lens 4 and main receiving terminal lens 4 and windshield 1 to isolated air is to the influence of light propagation path. The windshield is a device of the vehicle, and does not belong to a rainfall sensing device of an automatic windshield wiper system.
Further, the main transmitting end lens 7 includes a first convex lens 71, a first total reflection surface 72 and a first profiled prism set 73, and the main receiving end lens 4 includes a second profiled prism set 41, a second total reflection surface 42, a third total reflection surface 43 and a second convex lens 44.
As shown in fig. 2-5, after the main LED6 is used as a light source to emit light, the light is input through the optical path input end of the main emitting end lens 7, that is, the light source first reaches the first convex lens 71, the first convex lens 71 is used for light collimation, then the light reaches the first total reflection surface 72, the first total reflection surface 72 is used for turning the light, so that the optical path output end of the main emitting end lens 7 can emit parallel light beams, then the light reaches the first special-shaped prism group 73, and the light is refracted by the first special-shaped prism group 73 to turn the emitted light. Wherein the first total reflection surface 72 and the first shaped prism group 73 are light receiving surfaces.
Similarly, the light path receiving end of the main receiving end lens 4 receives the reflected light passing through the windshield and the silica gel pad, the reflected light first reaches the second special-shaped prism group 41, the second special-shaped prism group 41 acts to turn the light, the reflected light is first turned to the second total reflection surface 42, then the light is reflected to the third total reflection surface 43, and finally the light is condensed and irradiated on the light receiving part through the second convex lens 44.
Further, the prism faces of the first shaped prism group 73 and the prism faces of the second shaped prism group 41 are mirror-symmetric with respect to a central cut plane of the housing 2 along a direction perpendicular to the windshield 1.
In order to ensure that the second shaped prism group 41 can receive all the relation emitted by the first shaped prism group 71, the prism surfaces of the two are symmetrically distributed, the symmetric surface is the central tangent surface of the housing, and the central tangent surface is perpendicular to the windshield 1.
Further, the included angle between the first total reflection surface 72 and the first prism assembly 73 is 60 degrees.
Further, an included angle between the second total reflection surface 42 and the second special-shaped prism group 41 is 60 degrees, and an included angle between the third total reflection surface 43 and the second special-shaped prism group 41 is 90 degrees.
The first total reflection surface 72, the second total reflection surface 42 and the third total reflection surface 43 are exactly covered by the above included angle, and the light can be totally reflected to the first special-shaped prism group or the second convex lens.
Further, the apparatus further comprises: the LED comprises a secondary LED, a secondary emitting end lens, a secondary receiving end lens and a secondary light receiving element;
the optical path input end of the auxiliary receiving end lens and the optical path output end of the auxiliary transmitting end lens are tightly attached to the silica gel pad 8 in the shell 2;
the auxiliary light receiving element is arranged at the light path output end of the auxiliary receiving end lens;
the secondary LED is arranged at the optical path input end of the secondary emission end lens;
the PCB 3 is electrically connected with the secondary light receiving part and the secondary LED respectively.
As shown in fig. 6, a set of secondary reflection receiving optical paths is added on the basis of the primary transmission receiving optical path, and the primary and secondary reflection receiving optical paths are connected with the PCB 3, so as to transmit the electrical signal converted by the optical signal received by the primary light receiving element 5 and the secondary light receiving element to the PCB, and provide real-time rainfall detection information for the wiper system. According to the scheme, on one hand, the reduction of the accuracy of the single transmitting and receiving light path induced rainfall due to uneven rainfall density is prevented, and on the other hand, the rainfall can be induced when a group of receiving light paths break down.
Further, the transmittance of the silicone rubber pad 8 is the same as that of the windshield 1.
In order to ensure that the parallel light emitted by the main emission end lens 7 can reach the windshield 1 along the original light path at the original angle, a silica gel pad with the same transmittance as that of the windshield 1 can be selected.
Further, the optical path input end of the main receiving end lens 4 and the optical path output end of the main emitting end lens 7 are parallel to the plane where the windshield 1 is located, and are equal in distance to the windshield 1.
Therefore, the distance from the light path output end of the main transmitting end lens 7 to the reflection point on the windshield 1 is the same as the distance from the reflection point on the windshield 1 to the light path input end of the main receiving end lens 4, and the output light of the light path output end of the main transmitting end lens 7 can be received by the light path input end of the main receiving end lens 4.
Further, the PCB board 3 includes a switch, a power supply and a signal output terminal;
one end of the switch is connected with the main LED 6;
the other end of the switch is connected with the power supply;
the signal output terminal is connected to the main light receiving element 5.
The main LED6 can be controlled by a switch, and the power supply supplies power to the main LED6 and other required devices.
Further, the signal output end is connected with an automatic windshield wiper system so as to control the brushing frequency of the windshield wiper.
The signal output end is matched with the actual function of the PCB 3, and outputs a receiving electric signal or the intensity difference between the light source electric signal and the receiving electric signal. The signal output end is connected with the automatic windshield wiper system, and the automatic windshield wiper system judges the start and stop of the windshield wiper and the scraping speed according to the received electric signal or the intensity difference. If the received electric signal or the numerical value of the intensity difference is in a small range, judging that the windshield wiper is not started or stopped when no precipitation exists; if the numerical value of the received electric signal or the intensity difference is larger, the rainfall is judged to exist at the moment, the wiper scraping speed is calculated according to the numerical value of the received electric signal or the intensity difference, and then the wiper is started according to the wiper scraping speed.
Further, the material of the housing 2 is a visible light-impermeable material.
In order to prevent the device from being affected by external visible light, the material of the housing 2 is selected to be a material which is not transparent to visible light.
The application provides an automatic rainfall sensing device of windshield wiper system utilizes main transmitting terminal lens to become the parallel light with main LED's light collimation, improves the light signal intensity of raindrop induction zone, and the total reflection through main transmitting terminal lens and main receiving terminal lens is propagated simultaneously, reduces the propagation loss of light to improve the response degree of accuracy to the door window surface precipitation condition.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A rainfall sensing device for an automatic windshield wiper system, comprising:
a housing (2);
a silica gel pad (8) closely attached to the windshield (1) on the opening side of the housing (2);
the light path input end of the main receiving end lens (4) and the light path output end of the main transmitting end lens (7) are tightly attached to the silica gel pad (8) in the shell (2);
a main light receiving part (5) at the light path output end of the main receiving end lens (4);
a main LED (6) at the optical path input end of the main emitting end lens (7);
a PCB board (3) electrically connected to the primary light-receiving member (5) and the primary LED (6);
the PCB (3) is fixed on the shell (2).
2. The apparatus according to claim 1, wherein the main transmitting end lens (7) comprises a first convex lens (71), a first total reflection surface (72) and a first shaped prism set (73), and the main receiving end lens (4) comprises a second shaped prism set (41), a second total reflection surface (42), a third total reflection surface (43) and a second convex lens (44).
3. The apparatus according to claim 2, wherein the prism faces of the first profiled prism group (73) and the prism faces of the second profiled prism group (41) are mirror symmetric with respect to a central section of the housing (2) along a direction perpendicular to the windshield (1).
4. The apparatus according to claim 2, wherein the first total reflection surface (72) and the first shaped prism group (73) form an angle of 60 degrees.
5. The apparatus according to claim 2, wherein the angle between the second total reflection surface (42) and the second shaped prism group (41) is 60 degrees, and the angle between the third total reflection surface (43) and the second shaped prism group (41) is 90 degrees.
6. The apparatus of claim 1, wherein the apparatus further comprises: the LED comprises a secondary LED, a secondary emitting end lens, a secondary receiving end lens and a secondary light receiving element;
the optical path input end of the auxiliary receiving end lens and the optical path output end of the auxiliary transmitting end lens are tightly attached to the silica gel pad (8) in the shell (2);
the auxiliary light receiving element is arranged at the light path output end of the auxiliary receiving end lens;
the secondary LED is arranged at the optical path input end of the secondary emission end lens;
the PCB (3) is electrically connected with the auxiliary light receiving piece and the auxiliary LED respectively.
7. The device according to claim 1, characterized in that the transmittance of the silicone pad (8) is the same as the windshield (1).
8. The arrangement according to claim 1, characterized in that the PCB board (3) comprises switches, power and signal outputs;
one end of the switch is connected with the main LED (6);
the other end of the switch is connected with the power supply;
the signal output end is connected with the main light receiving element (5).
9. The apparatus of claim 8, wherein the signal output is connected to an automatic wiper system to control the frequency of wiper actuation.
10. The device according to claim 1, characterized in that the material of the housing (2) is a visible light-impermeable material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921325939.XU CN210734092U (en) | 2019-08-15 | 2019-08-15 | Rainfall sensing device of automatic windshield wiper system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921325939.XU CN210734092U (en) | 2019-08-15 | 2019-08-15 | Rainfall sensing device of automatic windshield wiper system |
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| Publication Number | Publication Date |
|---|---|
| CN210734092U true CN210734092U (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921325939.XU Active CN210734092U (en) | 2019-08-15 | 2019-08-15 | Rainfall sensing device of automatic windshield wiper system |
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| CN (1) | CN210734092U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11208759B2 (en) * | 2018-09-07 | 2021-12-28 | Roj S.R.L. | Weft thread reflection optical sensor in a weaving weft feeder |
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2019
- 2019-08-15 CN CN201921325939.XU patent/CN210734092U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11208759B2 (en) * | 2018-09-07 | 2021-12-28 | Roj S.R.L. | Weft thread reflection optical sensor in a weaving weft feeder |
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