Moisture detection system and method of using thereof

FIELD: electricity.

SUBSTANCE: as per the first version, moisture detection system consists of an electric conductor, vibration generator that supplies the appropriate signal of the specified amplitude and frequency, resonance circuit, filtering circuit, and analogue-to-digital converter and controller. As per the second version, the system consists of the means located on a base and meant for passing electric current. That means responds to the signal supplied from vibration generator for feeding the resonance signal of the second amplitude the value of which depends on resonance frequency of the current-passing means. As per the third version, the system consists of a base, electric conductor located on that base, and detection means sensitive to vibration generator signal and electric conductor. As per the fourth version, the system includes liquid storage reservoir, electric conductor located on the above reservoir, the means sensitive to vibration generator signal and electric conductor. The means serves for supplying control signal when detecting such change of resonance frequency of electric conductor, which corresponds to the reservoir liquid level which is lower than the expected one. Moisture detection method provides the use of the base, excitation of electric conductor with vibration generator signal, determination of the first amplitude of electric conductor, determination of the second amplitude of electric conductor and determination of difference between the first and the second amplitudes.

EFFECT: improving operating reliability of moisture detection system.

38 cl, 14 dwg

 

The technical field to which the invention relates.

The present invention relates to the field of moisture detection, and more specifically to the detection of the presence of moisture on the windscreen of the vehicle.

The level of technology

To date, the presence of moisture on the windscreen of the vehicle was found in four main ways. Namely, by using systems with capacitive sensor systems with resistive sensor systems with ultrasonic sensor and systems with an optical sensor.

The system with the capacitive sensor includes a capacitor formed on the windshield. In the presence of moisture on the windscreen is a corresponding change in the capacitance of the capacitor. Provides for connection of the respective sensing circuit, responsive to the capacitance change and control the operation of the wiper depending on changes in the capacitance. For example, you can reference capacitive humidity sensors, which are disclosed in U.S. patent No. 5668478 (Buschur), 5682788 (Netzer), 5801307 (Netzer) and 6094981 (Hochstein).

Resistive measuring system includes two conductive element arranged with a gap relative to each other on the windscreen or any other part of the vehicle, for example, such as an ordinary whip antenna. Electric with the EMA, connected to the conducting elements, carries out the measurement of changes in the values of their resistance in the presence of water, shunt resistive elements, and controls the operation of the wiper depending on the resistance changes. For example, you can refer to the resistive measurement system, which are disclosed in U.S. patent No. 5659294 (Schroder), 5598146 (Schroder), 5780718 (Weber), 5780719 (VanDam), 5783743 (Weber), 5900821 (Petzold).

System with ultrasonic sensor includes a measuring transducer, which emits an ultrasonic signal directed to the first surface of the sheet, and receives the ultrasound signal reflected from the second surface of the sheet. On the basis of changes in the magnitude of the reflected signal is determined by the presence or absence of foreign bodies on the second surface of the sheet. For example, you can reference system with ultrasonic sensor, which is disclosed in U.S. patent No. 5818341 (Saurer et al.) and in European publication No. EP 0638822.

System with optical sensor includes a light detector situated so as to detect light from the source reflected in the windshield. In the presence of moisture on the windscreen will change the amount of light received by a light sensor that will lead to a change of the output signal of the light sensor. Electrical diagram table which determines the change of the output signal, coming from the light sensor, and controls the operation of the wiper depending on the magnitude of this change. For example, you can refer to the detection light, which are disclosed in U.S. patent No. 5694012 (Pientka et al), 5990647 (Zettler), 6052196 (Pientka et al), 6066933 (Ponziana), 6084519 (Coulling et al), 6207967 (Hochstein), 5661303 (Teder), 6250148 (Lynam), 6218741 (Braun et al) and 6232603 (Nelson).

The problem with the use of a system having a capacitive sensor, is necessary to form a capacitor having sufficient capacity, then the capacitance change in the presence of rain water on the windscreen can be determined using an appropriate electric circuit detection. Another problem associated with the use of a system having a capacitive sensor, is that the corresponding change in capacitance may occur also due to heating or cooling of the metal film that forms the capacitor, resulting in the capacitance of such a capacitor in the course of its operation.

The problem with using the system, resistive sensor, is necessary to ensure the availability of resistive elements formed on the outer surface of the windscreen, then such resistive elements will be under the influence of adverse weather conditions and, who is one, to be destroyed. In addition, the resistive elements of the system with a resistive sensor is also subject to relevant changes in the magnitude of its resistance occurring due to changes in temperature.

The problem associated with the use of the system having an ultrasonic sensor, and the system having an optical sensor, is necessary to find the position of the measuring transducer system with ultrasonic sensor and an arrangement of the light transmitter and light receiver system with an optical sensor inside the vehicle to ensure the detection of their moisture in the appropriate place on the windscreen. However, as a result of the desire to have a system with ultrasonic sensor or system with an optical sensor on the windscreen in the most appropriate place often observed partial deterioration of visibility through the windshield from the driver's seat, then either have to have a system with one or another of these sensors in not optimal for effective action. In addition, the sensitivity of the optical sensor in the detection of moisture may in varying degrees be changed depending on the color or tint of the windshield in the path of light propagation from the transmitter is a response to the light receiver.

Thus, it would be highly desirable to provide a solution to the above and other problems by creating a system to detect the presence of moisture, with small, almost invisible sensor located on a flexible substrate, which is connected with the sheet material as the windshield, an electric circuit for excitation of the sensor and sensing an electric circuit for detecting changes in the resonant frequency of the sensor, which occurs due to the presence of moisture on the specified sheet material and, more specifically, the number or the rate of accumulation of moisture on the specified sheet material. In addition, it would also be desirable to develop an appropriate method for detecting moisture on the sheet material by detecting changes in the resonant frequency of the sensor, which is located on the flexible substrate, which connects with the specified sheet material. Various other desired devices and methods may be obvious to a person of ordinary skill in the art upon reading and studying the following detailed description of the present invention.

Disclosure of inventions

The present invention is a system for detecting the presence of moisture, which includes an electrical conductor located on a surface the ti substrate. Electrical conductor has a resonant frequency that varies depending on the amount of moisture that are near electrical conductor. There is an oscillator that supplies a signal corresponding to the desired amplitude and frequency. Requires the presence of the resonant circuit connected to the electrical conductor and responsive to the signal of the oscillator, for supplying a resonant signal, the amplitude of which depends on the resonant frequency of an electrical conductor. There is also a filter circuit which responds to the signal from the resonant circuit, for supplying the rectified and filtered signal. It is also envisaged the presence of analog-to-digital Converter, which responds to the rectified and filtered signal, to supply a digital signal, depending on the level of the rectified and filtered signal. There is a controller, responsive to the specified digital signal and operate another system in accordance with the received digital signal.

Another system may be a system that responds to a signal from the controller, ensuring the proper regulation of the speed at which moisture is removed from the zone adjacent to the electrical conductor, according to the t amount of moisture, located near the electrical conductor, and(or) from the rate of accumulation of moisture near the electrical conductor.

The substrate can be used windshield of a vehicle having multiple bonded together by a transparent sheet. An electrical conductor may be laid between the transparent sheets.

This substrate may be flexible. The system detect the presence of moisture may include a windshield of a vehicle having multiple transparent sheets, glued together with a flexible substrate, laid between them. On a flexible substrate may also be grounded conductor, which is located on the flexible substrate so that at least partially surround a specified electrical conductor. It may also, or alternatively, be provided and available on flexible substrate corresponding conductive material located on the surface of the substrate on the opposite side relative to the specified electrical conductor. This conductive material may be formed in the form of a Faraday screen. In addition to this may also or alternatively be provided and the availability of appropriate coatings made from electrically conductive material on the surface at least, one layer of transparent sheet material located on the same side of the flexible substrate, which is opposite relative to the outer surface of the windscreen of the vehicle.

The resonant circuit may include a resonant circuit with the capacitor and the inductor and connected in parallel between the electrical conductor and the reference voltage, and a resistor connected between the oscillator and the other side of the oscillating circuit, where the electrical conductor. The filter circuit may include a diode connected in such a way as to conduct current from the resonant circuit to the analog-to-digital Converter, and a capacitor connected between the output of the diode adjacent to the analog-to-digital Converter, and a voltage reference.

The present invention also provides a system for the detection of moisture, which includes means located on the substrate and intended for passing an electric current. This tool has a resonant frequency varying depending on the amount of moisture in the vicinity of the tool. There is an oscillator, the input signal of specified frequency and a first amplitude in the tool, passing the current. In addition, envisage which requires the availability of appropriate tools, responsive to the signal from the oscillator, for supplying the corresponding resonance signal having a second amplitude, the value of which depends on the resonance frequency means passing current. This second amplitude may be greater or less than the specified first amplitude. Detection system moisture may include means, responsive to the resonant signal, for supplying the control signal, the level of which depends on the value of the second amplitude.

Detection system moisture may include a wiper system, which is adapted to interact with the sheet. The wiper system is sensitive to the control signal to remove moisture from the area adjacent to the tool, passing the current, based on such factors as the amount of moisture on the specified sheet and (or) the rate of accumulation of moisture in the area adjacent to the specified tool, passing the current.

Means passing current, may include one or more lines of conductive material, one or more strips of conductive material, or deposited in the form of one or more lines and / or strips of conductive particles.

The substrate can be used windscreen, which includes several glued together sheets of glass. Tool, proposalsa the current can be laid between sheets of glass.

This substrate may be a flexible substrate, which is connected with the corresponding sheet. Means passing current, has a resonant frequency varying depending on the amount of moisture within the specified sheet. The wiper system is adapted to interact with the sheet and sensitive to the control signal to remove moisture from the area adjacent to the tool, passing the current, based on such factors as the amount of moisture on the specified sheet and (or) the rate of accumulation of moisture in the area adjacent to the specified tool, passing the current.

Means passing current, may include one or more lines of electrically conductive material located on a flexible substrate.

As specified sheet can be used windscreen, which includes several glued together sheets of glass. The flexible substrate may be laid between sheets of glass.

On a flexible substrate may also be grounded conductor, which is located on it so that at least partially surround a specified tool, passing the current or conductive material located on the surface of the flexible substrate from the opposite side relative to the specified media is TBA, passing current, and mentioned conductive material formed in the form of a Faraday screen. May also be prescribed and the availability of appropriate coatings made from electrically conductive material on the surface of at least one sheet.

In addition to this, the present invention is also a method for detecting the presence of moisture. The proposed method involves the application of a substrate on which is located an electrical conductor. Specified electrical conductor is excited under the influence of the signal supplied by the oscillator in the absence of moisture near the electrical conductor. This is determined by the first amplitude response of the electrical conductor for such excitement. Specified electrical conductor is excited and also under the influence of the signal supplied by the oscillator in the case when there is a presence of moisture near the electrical conductor. This is determined by the second amplitude response of the electrical conductor for such excitement. A second amplitude different from the first amplitude due to a change in the resonant frequency of an electrical conductor, caused by the presence of moisture in the area adjacent to the electrical conductor. is allocated the difference between the first and second amplitudes, in this case the obtained value of the difference depends on the amount of water present in the area adjacent to the electrical conductor.

The proposed method may also include the removal of moisture from the zone adjacent to the electrical conductor, with a rate depending on the obtained values of the specified value.

At least, between the two sheets of glass can be incorporated substrate. On the substrate or on at least one of said glass sheets may be provided with appropriate shielding means. The substrate can also be made flexible.

Moreover, the present invention is a system for detecting moisture, which includes a substrate, an electrical conductor located on the substrate, means for initiating an electrical conductor by an appropriate signal from the oscillation generator, and means sensitive to the signal generator and the electrical conductor, for determining changes in the resonant frequency of the above-mentioned electrical conductor as a result of changing the amount of moisture on the sheet in the area adjacent to the electrical conductor.

The substrate can be made flexible, and the system may additionally include the appropriate sheet in contact with podloga is. In addition, this system can also include means for removing moisture from the sheet, and means associated with means for detecting moisture, to determine the status, in which the substrate is removed moisture by using a tool to remove it.

Finally, the present invention is a system for determining liquid level, comprising a reservoir for the liquid, is made of electroconductive and magnetocapacitive material and is equipped with an electrical conductor placed on the tank. Provides for the presence of the respective excitation means excites the specified electrical conductor under the influence of the signal supplied by the oscillator, and the availability of funds is sensitive to the signal generator and the electrical conductor, to determine changes in resonant frequency of the specified electrical conductor as a result of changes in the liquid level in the specified tank and feeding the control signal upon detection of such a change of resonant frequency of an electrical conductor, which corresponds to a lower liquid level than the specified value of the liquid level in the tank.

The electrical conductor can be placed on a flexible substrate,located on the reservoir for the liquid.

Brief description of drawings

Figure 1 is a top view of the sheet, such as sheet glass or windscreen, which includes the first version of the antenna with an electrical conductor, which is used to detect moisture in the sheet.

Figure 2 is a transverse section along the line II-II in figure 1.

Figure 3 is a top view of the sheet, such as sheet glass or windscreen, which includes the second version of the antenna that includes a substrate with on her electric conductor, designed to detect moisture in the sheet.

4 is a transverse section along the line IV-IV in figure 3.

5 is a transverse section along the line V-V in figure 4.

6 is a cross section of a second variant of the antenna, shown in figure 4, includes a conductive material, located at the side of the substrate, opposite to the electric conductor.

7 is a cross section of a second variant of the antenna, shown in figure 4, including the floor, is made of electrically conductive material on the inner surface of one of the layers of glass.

Fig - schematic illustration of the electrical circuitry used for excitation and detection response electrical conductor in the first and second versions of the antenna.

Figure 9 - schematic of the system with whom clochettes, marked on Fig.

Figa-10d - alternative versions of the electrical conductor in the first and second versions of the antenna.

11 is a perspective view of a tank for liquid, intended for the vehicle and includes a electrical conductor in the first and second versions of the antenna.

The implementation of the invention

As shown in figure 1, the sheet or panel made of optically transparent material, such as sheet glass or the windshield 2, includes located the antenna 4. The first version of the antenna 4 includes one or more electrical conductors 6, is connected to a conductive foil 8, which is used for connecting the respective electronic circuit to the electrical conductor 6. In the embodiment of the present invention, is shown in figure 1, the foil 8 is located on the outer side relative to the perimeter of the windshield 2. However, this circumstance should not be construed as a limitation on the present invention, since the foil 8 can also be located within the perimeter of the windscreen 2.

As shown in figure 2, and with reference to figure 1, the windshield 2 is formed of outer and inner layers 10 and 12 glasses, linked to the s to each other through the plastic layer 14, performed, for example, has polyvinylbutyral, resulting in a windshield 2, having a single structure. However, the layers 10 and 12 may be made of any other transparent rigid material, for example, such as polycarbonate. Electrical conductor 6 can be located on the surface of the glass layer 10 and the layer 12 of glass facing inwards or outwards. Electrical conductor 6 may be a wire or plate of conductive material; a coating of conductive material deposited on one surface of the layer 10 of glass or layer 12 of glass in the form of lines or bars; or coating of electrically conductive particles on one surface of the layer 10 of glass or layer 12 of glass in the form of lines or bars. It is desirable that an electrical conductor 6 had a width and / or thickness at which it becomes essentially invisible to the naked eye.

As shown in Fig.3-5, the second embodiment of the antenna 4 includes one or more electrical conductors 6, located on the flexible substrate 16. Figure 3 and 4 shows that part of the flexible substrate 16, which includes a electrical conductor 6, is on the outside relative to the perimeter of the windshield 2 in order to facilitate connecting the respective electronic circuit to the electric launched the 6. However, this circumstance should not be construed as a limitation on the present invention, since the flexible substrate 16 having therein an electrical conductor 6 may also be located entirely within the perimeter of the windscreen 2.

As shown in figure 4, the flexible substrate 16 may be sandwiched between layers 10 and 12 glasses so that an electrical conductor 6 was converted to the corresponding surface of the glass layer 10 and the layer 12 of glass facing the inside, or to one surface of the plastic layer 14 facing outward. In an alternative embodiment, the flexible substrate 16 can be located on a corresponding surface of the glass layer 10 and the layer 12 of glass, facing outwards, so that the electrical conductor 6 was converted to the mentioned surface facing outward, or in the opposite direction relative to the surface. In order to avoid undesirable effects on a flexible substrate 16 and / or electrical conductor 6 of adverse external conditions, it would be highly desirable to insert the flexible substrate 16 between the layers 10 and 12 glasses, and not to have this flexible substrate 16 on the corresponding surface of the glass layer 10 and the layer 12 of glass, facing outwards.

The flexible substrate 16 can be made and is of any flexible insulating material, suitable for use with this purpose, for example, such as polyethylene terephthalate, polyvinylbutyral, ultra-thin glass, etc. electrical conductor 6 of any desired shape may be made from a sheet of any electrically conductive material suitable for use with this purpose, reliable coupling with the flexible substrate 16 is provided using conventional techniques used in the photolithographic production. Electrical conductor 6 of any desired shape can be manufactured on a flexible substrate 16 by screen printing method by applying the appropriate conductive material suitable for use for this purpose on the flexible substrate 16, having any desired shape, either by way of inkjet printing with the application of appropriate conductive material, suitable for use with this purpose, on a flexible substrate 16, having any desired shape. Offered here is above the electrical conductor 6 having an appropriate form on a flexible substrate 16 should not be construed as a limitation on the present invention, as may be prescribed the use of any other means, suitable for use to form the electrical conductor 6 any desire is the first form on a flexible substrate 16.

As shown in figure 5 and 6, and with reference to figure 3 and 4, the portion of the flexible substrate 16, which is outside the perimeter of the windshield 2 can have on an electrical conductor 6 is inserted between the flexible substrate 16 and the insulating material 17, concatenate with an electric conductor 6. Insulating material 17 may be made in the form of sheet insulating material, such as Kapton etc® (registered trademark of Microsoft E.I.DuPont de Nemoir and Company Corporation, gailingen, Delaware, USA), or from any other suitable solid or liquid insulating material suitable for use with this purpose, which provides reliable protection of electrical conductor 6. In order to avoid the adverse effects of moisture and (or) any pollutants in the form of solid particles on the portion of the electrical conductor 6, which is inserted between the substrate 16 and the insulating material 17, is provided for positioning the insulation material 17 so that the end thereof is positioned between the layers 10 and 12 glasses.

In order to avoid the adverse effects of moisture and(or) any pollutants in the form of solid particles on the electrical conductor 6, is inserted between the layers 10 and 12 glasses, provides for the application of the corresponding thermosetting the lei 18, applied to the electrical conductor 6 from the side of the flexible substrate 16 is located between the layers 10 and 12 glasses. Specified thermosetting adhesive 18 is applied so that it covers an entire end of the insulating material 17 located between the layers 10 and 12 glasses, grasping at a sufficiently large distance between the layers 10 and 12 glasses so that after curing thermosetting adhesive 18 between the layers 10 and 12 of the glass and the plastic layer 4 was formed hermetic seal that prevents moisture penetration and(or) any pollutants in the form of solid particles inside and contact them with the part of the electrical conductor 6, which is located between the layers 10 and 12 glasses.

Before the effects of heat on thermosetting adhesive 18 and the plastic layer 14, is required for curing of the adhesive, the purpose of a preliminary fixing of the flexible substrate 16 in a suitable position between the layers 10 and 12 glasses in the space between the flexible substrate 16 and the plastic layer 14 may be formed pressure-sensitive adhesive 19.

As shown in figure 5, the flexible substrate 16 can include a grounded conductor 7, which at least partially surrounds an electrical conductor 6. When connecting the grounded conductor 7 to the corresponding history the NICU reference voltage 44, for example, such as the ground, around the electrical conductor 6 is formed in the grounding circuit. The presence of such a grounding circuit avoids the effects of unwanted internal electromagnetic interference that can adversely affect operation of electrical conductor 6, affecting its ability to be resonant antenna element 4. In addition, as shown in Fig.6, with the opposite side of the flexible substrate 16 relative to the side where the electrical conductor 6 may also, or alternatively, to provide for the presence of an appropriate conductive material 46 located on the substrate so that it can be connected to the specified voltage reference 44. This conductive material 46 can be made in the form of plates, one or more lines or a grid, or have any other suitable form that defines the Faraday screen that allows you to avoid unwanted exposure to emerging internal electromagnetic interference that can adversely affect operation of electrical conductor 6, affecting its ability to be resonant antenna element 4.

As shown in Fig.7, and with reference to figure 3-6 may also be provided, or alternatively, the presence of electr the conductive coating 48, applied to the corresponding surface of the layer 12 of glass, for example, on its inner surface, which is connected to the voltage reference 44 in order to avoid adverse effects arising from the internal electromagnetic interference that can adversely affect operation of electrical conductor 6, affecting its ability to be resonant antenna element 4. Electrically conductive coating 48 can be transparent or colored. In the case of performing the colour coating 48 may serve a dual purpose - as a ground-plane or the Faraday screen for antenna 4 and tinted shield windscreen 2. Although in this case the description is in relation to the second variant of the antenna 4, but should, nevertheless, be understood that the coating 48 may also be applied to the appropriate surface of the layer 12 of glass, for example, on its inner surface and with respect to the first embodiment of the antenna 4 shown in figures 1 and 2. You should also understand that in order to avoid undesirable effects arising internal electromagnetic interference that can adversely affect operation of electrical conductor 6, affecting its ability to be resonant antenna element 4, you can use any of the discussed here above means - sasem the military Explorer 7, conductive material 46 and(or) conductive coating 48 - individually or in various combinations with each other.

As shown in Fig, as well as with links to all previous drawings, an electronic circuit connected to the electric conductor 6 in each of the discussed here above embodiments of the antenna 4 includes a microprocessor 20, a frequency generator 22, the resonant circuit 24, the filter circuit 26 and an analog-to-digital Converter 28. It is also envisaged the existence of a wiper system 30 connected to the specified schema in such a way as to receive from the microprocessor 20, one or more control signals that provide for the proper regulation of the operation of the wiper system 30 implemented as outlined in the description below.

The microprocessor 20 is associated with certain electronic hardware, for example, such as a persistent storage device, storage device, random access, buffers, I / o, etc. that in order to simplify the image in figure 3 is not shown. The operation of the microprocessor 20 is under the control of the software stored in the corresponding storage device connected to the microprocessor 20. Under the counter is the manufacturer of this software mathematical software, the microprocessor 20 provides a supply of the frequency generator 22 corresponding signal having a given amplitude and a given frequency. Is this a given frequency may be in the range between 300 kHz and 700 kHz, and more specifically in the range between 400 kHz and 600 kHz. The signal generator is supplied to the resonant circuit 24, which is connected to the antenna 4. In response to a signal received from the oscillator, resonant circuit 24 generates a resonance signal, the amplitude of which depends on the resonance frequency of the antenna 4.

The resonant circuit 24 includes a resistor R1, which separates the signal generator of oscillations of the resonant signal. In addition, the resonant circuit 24 also includes an oscillatory circuit 32 connected between the antenna 4 and the reference-voltage source 34, for example, the grounded side of the resistor R1, the opposite frequency generator 22. Resonant circuit 32 can be designed to resonate at a certain frequency value signal generator. Resonant circuit 32 includes a resistor R2, an inductor I1 and the capacitor C1 connected in parallel between the antenna 4 and the reference voltage 34.

The filter circuit 26 includes a diode D1 connected in such a way as to skip che the ez itself resonance signal, coming from the resonant circuit 24 and directed to analog-to-digital Converter 28. Requires the presence of the capacitor C2 and the resistor R3 connected in parallel to each other between the opposite side of the diode D1 relative to the side where connected resonant circuit 24, and a source of reference voltage 34. May also be prescribed, but optionally, the presence of the inductor 12 connected in parallel between the capacitor C2 and the resistor R3. The output signal of the filter circuit 26 is a rectified and filtered signal enters the analog-to-digital Converter 28. Under control of the microprocessor 20, analog-to-digital Converter 28 carries out sampling the rectified and filtered signal and converts it into an equivalent digital signal, which is calculated by the microprocessor 20.

To detect moisture on the windshield 2, the microprocessor 20 causes the frequency generator 22 to generate a signal at a time until any moisture on the face outside surface of the windshield 2 is not yet observed. Then the microprocessor determines the response of the antenna 4 on the signal of the oscillator, Obschaya the first digital signal obtained at the output of analog-to-digital Converter 28 when the ant is nna 4 receives the signal of the oscillation generator. When the microprocessor remembers the first digital signal for subsequent use.

Later, when facing the outside surface of the windshield 2 appears moisture, for example in the form of the accumulated water, or some of its spray, the microprocessor 20 performs the processing of the second digital signal received from the output of analog-to-digital Converter 28 upon receiving antenna 4 signal generator.

In an alternative embodiment, the microprocessor 20 can process the first digital signal, when facing the outside surface of the windshield 2 will already be wet, for example, in the form of the accumulated water or spray, and processing the second digital signal can be made to them at that time, when facing the outside surface of the windshield 2, the moisture absent. To this end, the first digital signal corresponding to the presence or absence of moisture on windshield 2 can be used as a reference when determining based on the received second digital signal of the presence or absence of moisture on windshield 2. As used in the first and second digital signals when determining the presence or absence of moisture on windshield 2, is disclosed in the following description.

It was observed that the rectified and filtered si is cash, obtained at the output of the filter circuit 26 has a different amplitude when the appearance of moisture on windshield 2 in the vicinity of the antenna 4. More specifically, the rectified and filtered signal obtained at the output of the filter circuit 26 has an amplitude, the value of which increases or decreases up to a certain limit by increasing the amount of moisture that is located on the windshield 2 in the vicinity of the antenna 4. For example, in the complete absence of moisture on windshield 2 in the vicinity of the antenna 4 is observed corresponding to the first value of the amplitude of the rectified and filtered signal. However, when the windshield 2 in the vicinity of the antenna 4 is starting to get moisture in the form of drops of water, rectified and filtered signal obtained at the output of the filter circuit 26, will have a second amplitude value that is different from the first amplitude value. In addition, when the windshield 2 in the vicinity of the antenna 4 is starting to get moisture in the form of sprayed water, rectified and filtered signal obtained at the output of the filter circuit 26, will be the third amplitude value that is different from the second amplitude value.

This changeable nature of the amplitude due to a change in the value of the impedance of the antenna 4, observed at a given frequency of the signal generator is ora fluctuations in response to relevant changes in resonant frequency of the antenna 4, occur as a result of increasing the amount of moisture that is located on the windshield 2 in the vicinity of the antenna 4. Thus, for example, if the specified signal frequency of the oscillator is chosen equal to the resonant frequency of the antenna 4, which was observed when the windshield 2 in the vicinity of the antenna 4 is atomized liquid, then increase the amount of moisture that is located on the windshield 2 in the vicinity of the antenna 4, ranging from complete absence of moisture until the advent of the liquid in a spray form, a corresponding decrease in the total resistance of the antenna 4, and then starts the corresponding decrease in the amplitude of the rectified and filtered signal obtained at the output of the filter circuit 26. Similarly, for example, if the specified signal frequency of the oscillator is chosen equal to the resonant frequency of the antenna 4, which was observed when the windshield 2 in the vicinity of the antenna 4 is completely absent any moisture, then increasing the amount of moisture that is located on the windshield 2 in the vicinity of the antenna 4, ranging from complete absence of moisture until the advent of the liquid in a spray form, a corresponding increase in the impedance of the antenna 4, and then starts also a corresponding increase in the amplitude of the rectified and prefilter the data signal, obtained at the output of the filter circuit 26. Thus, depending on the ratio between the reference frequency signal of the oscillator and the resonant frequency of the antenna 4, the amplitude of the rectified and filtered signal obtained at the output of the filter circuit 26, may either increase or decrease.

An electronic circuit connected to the electric conductor 6, is able to determine the appropriate changes its resonant frequency occurring due to changes in moisture, located on the windshield glass 2 in the vicinity of the conductor 6, ranging from complete absence of moisture until the advent of the liquid in a spray form. However, it was noted that dew or fog, deposited on the surface of the windshield 2, the best can be detected in the case, if an electrical conductor 6 or the substrate 16 are positioned so that they were in contact with the surface of the windshield 2, on which are deposited dew or fog.

Then, the microprocessor 20 compares the first digital signal with the second digital signal to determine the amount of moisture that is present on the windshield 2 in the vicinity of the antenna 4. More specifically, the microprocessor 20 calculates the difference between the first and second digital signals and on the basis of this difference determines the t amount of moisture, which is present on the windshield 2 in the vicinity of the antenna 4. On the basis of the obtained results served the appropriate control signal to the wiper system 30 and to regulate the mode of operation of the wiper depending on the amount of moisture that is located on the windshield 2.

As shown in Fig.9, and with links to all previous drawings, the wiper system 30 includes a control circuit 36 of the wiper motor, which receives the control signal from the microprocessor 20, and the electric motor 38 of the wiper which is connected with the brush 40 wiper located on the windshield 2. As mentioned herein above description, the control signal supplied by the microprocessor 20 to the control circuit 36 of the wiper motor, depends on the difference between the first and second digital signals processed by the microprocessor 20. In order to provide for the regulation of the action of the wiper system 30 in accordance with the amount of moisture that is located on the windshield 2 in the vicinity of the antenna 4, the numerical range of digital difference values, which can be processed by the microprocessor 20, is divided into sections based on what is required will provide the regime system of the wiper 30. For example, if the number of digital difference values is supposed to be split into two areas, then the area corresponding to the upper range of numeric range of values of the difference digital signals, is allocated for the operation of a wiper system 30 with a relatively high speed, and the part corresponding to the lower range of the numerical range of digital difference values, allocated for the operation of a wiper system 30 with a relatively low speed. Thus, if the value of the current difference between the numeric values of the second digital signal and the first digital signal is within the upper range of numeric range of values of this difference, then the microprocessor 20 supplies a corresponding control signal, which permits operation of the control circuit 36 of the wiper motor so that established this mode of operation of the motor 38 drive wiper blade, in which the brush 40 of the wiper moves at a high speed. Similarly, if the value of the current difference between the numeric values of the second digital signal and the first digital signal is within the lower range of numeric range numeric values this difference, then the microprocessor 20 supplies the appropriate napravlyayuschiysya, which permits operation of the control circuit 36 of the wiper motor so that established this mode of operation of the motor 38 drive wiper blade, in which the brush 40 of the wiper is moving at a low speed.

Moreover, there is also the possibility of various other modes of operation of the wiper system 30, which is provided by a microprocessor 20 and the control circuit 36 of the wiper motor in dependence on the difference between the current numerical values of the second digital signal and the first digital signal. These modes can include such modes as pulse mode, single acting, in the exercise of which the brush 40 of the wiper wipes the windshield 2 only once, for example, to remove the dew or fog settled on the windshield 2; pulse mode with a constant duty cycle, applied, for example, in cases where there is a constant accumulation of individual water droplets on the windshield 2, but the moisture accumulates in large enough quantities to justify the continuous operation of the wiper system 30 with a low speed; and pulse mode with a variable duty cycle, in Khujand is the implementation of which the intensity of the wiping of the windscreen 2 brush 40 of the wiper varies depending on the amount of moisture and (or) the rate of its accumulation on the windshield 2.

The microprocessor 20 may be designed to serve two or more different control signals, providing the opportunity to work system wiper 30 in two or more of the above modes depending on the observed changes in the amount of moisture that is located on the windshield 2. In the absence of moisture on windshield 2, the microprocessor 20 can provide a transition system wiper 30 in a state in which the wiping of the windscreen 2 brush 40 of the wiper either stops or does not start.

As shown in figa-l0d are different versions of the electrical conductor 6 in the first and second versions of the antenna 4. On figa and figure 5 shows an electrical conductor 6 made in the form of a coil. On fig.10b and 10 shows three parallel electrical conductor 6, have a common point of branching and are spaced relative to each other. As shown by the dotted lines, continuing the electrical conductors 6 on fig.10b and 10C, the electrical conductors 6 can be designed in such a way as to have virtually any desired length. And finally, on fig.10d shows two parallel electrical conductor 6 having a common point of divergence and arranged with an interval of each category is Ino other. And here, too, dashed lines, continuing the electrical conductors 6, it is shown that presents on fig.10d electric conductors 6 may be of almost any desired length.

The present invention has several advantages compared with the known in the art appropriate systems designed to detect moisture. Among these advantages are: the presence of the antenna 4, which is essentially invisible to the naked eye from a distance of approximately one meter; the possibility of the placement of the antenna 4 in a transparent or non-transparent part of the windscreen 2; the insensitivity of the antenna 4 to the dirt; the possibility of detecting the presence of moisture at the antenna 4 within the larger surface area in comparison with the known in the art with appropriate sensors of comparable size; the ability to share the antenna 4 with substrates of different thickness and different from the composition of the materials from which they are made; and the present invention can detect the presence on the windscreen 2 drops of moisture, for example, droplets fell dew or fog settled, having a smaller size than when using known in the art appropriate systems designed to detect moisture.

As pok is shown at 11, and with links to pig, the present invention can also be used to determine the level of one or more fluids, for example, the liquid level in the respective tank, available on the vehicle. In particular, the antenna 4 can be mounted on the tank 42, intended for storage of a liquid and is made of any electroconductive and non-magnetic material. Preferably, such an antenna 4 is mounted on the outside of the tank 42 for storing fluid, situated while in the vicinity of its lower end. However, this circumstance should not be regarded as an appropriate limitation on the present invention. The tank 42 for storing the liquid can be performed in such a way as to serve for storage of the liquid used in the windscreen washer, coolant, radiator, or any other fluid used in the vehicle, while measuring the appropriate level of liquid in the tank can be made at the antenna 4 and the electronic circuit shown in Fig.

To determine the liquid level in the respective tank 42 provides a signal generator to an electrical conductor 6 of the antenna 4, when the inside of the tank 42 for storing the Oia liquid no liquid. The first response output signal electrical conductor 6 is sampled and stored. At appropriate intervals of time after the storage tank for the liquid to be filled with appropriate fluid, repeatedly discretization is second response output signals electrical conductor 6 to the signal generator. Each such second response output signal is matched with the stored first response output signal. As soon as the second response output signal will come in a corresponding specified value with the stored first response output signal, the output of the electronic circuit receive the control signal, under the influence of which is activation of the corresponding indicator, for example, to check the fluid level in the washer fluid, check the fluid level in the radiator and so on

It should be understood that with the lowering of the liquid level in the respective tank 42 for storing the liquid gradually decreases the difference between the first response output signal and the second response output signal received from the antenna 4. Thus, as soon as the second response output signal will come in a corresponding specified value with the stored first response output signal that will testify to the fact, the liquid level in the tank has decreased to a pre-given its size, the output of the electronic circuit receive the control signal. In order to facilitate the detection of changes of the resonance frequency of the antenna 4, you can select the corresponding preset value signal frequency of the oscillator, which is provided by optimizing the value of changes in impedance of the antenna 4 in response to the presence of fluid within the respective reservoir 42 to the liquid. A similar explanation is also valid in relation to the change of resonant frequency antenna 4 that occur due to the presence of moisture on windshield 2.

In the case where the vehicle requires the presence of a certain number of antennas 4, it is also possible to install the appropriate device Association signals (not shown) between each antenna 4 and the electronic circuitry shown in Fig. While under the control of the microprocessor 20, the device of combining signals can provide selective connection of the electronic circuit to each of the antenna 4 for the signal of the oscillation generator having an appropriate frequency, each such antenna 4, and to detect the output signal from each antenna 4, send it in response to appropriate the speaker signal generator oscillations. Preferably it would be to the microprocessor 20 could under the control of appropriate software tools to adjust the frequency of the signal generator of oscillations generated by the frequency generator 22, so that, by optimizing the change of resonant frequency of each antenna 4, to detect the presence or absence of a particular liquid.

The present invention discussed herein above description with reference to specific preferred examples of its implementation. However, there are various changes and additions, which obviously will be offered by experts in the field of technology in the process of reviewing them here above detailed description of the present invention and their knowledge of the proposed material. For example, despite the fact that the description here is in connection with the detection of moisture on windshield 2, the present invention can be, however, used also for the detection of moisture on the surfaces of rigid or flexible substrates used in connection with other possible applications. Similarly, despite the fact that the description here is in connection with determining the level of liquid in the tank 42 for storing the corresponding liquid, mounted on the vehicle, the present invention can be however, used also to determine the level of liquid in the storage tank for liquid to be used in other applications. In addition, despite the fact that the description here is in connection with the control of the microprocessor 20 of the respective wiper system 30, the microprocessor 20 may be, however, used also to control the headlamps of the vehicle, the system draining the windscreen of the vehicle and(or) any other system designed for use on vehicles or for any other applications that are not associated with vehicles, and providing management depending on the presence of moisture on the corresponding substrate. In addition, despite the fact that there is a connection with the corresponding components of the electronic circuit, preferably, is carried out by means of conductors should, however, be understood that the transmission of signals between two or more of these components may also be carried out using the appropriate high-frequency (HF) and / or optical means of transmission of signals. Finally, the microprocessor 20 can also be designed in such a way as to provide a record for subsequent searching and retrieval of information in those days, when the substrate was found Nali is their moisture, and (or) duration of operation of the wiper system 30. These data can then be used for informational purposes, for example, to count the number of rainy days per month and / or definition of the term, when the brush wiper system 30 may require replacement. It is assumed that all such modifications and changes are encompassed by the present invention because they do not go beyond being and scope of the invention defined in the appended claims or the equivalents.

1. Detection system moisture containing an electrical conductor located on a surface of the substrate and having a resonant frequency varying depending on the amount of moisture that are near electrical conductor, an oscillator that supplies a corresponding signal of a given amplitude and a given frequency, a resonant circuit connected with the electric conductor and responsive to the signal of the oscillator, for supplying a resonant signal, the amplitude of which depends on the resonant frequency of an electrical conductor, a filter circuit, responsive to the signal from the resonant circuit, for supplying the rectified and filtered signal, analog-to-digital Converter, responsive to the rectified and filtered signal for supply of digital signals is a, depending on the level of the rectified and filtered signal, and a controller, responsive to the specified digital signal and operate another system in accordance with the received digital signal.

2. The system according to claim 1, characterized in that the other system is a system wiper, responsive to the signal from the controller, ensuring the proper regulation of the speed at which moisture is removed from the zone adjacent to the electrical conductor, depending on the amount of moisture in the vicinity of the electrical conductor, and (or) from the rate of accumulation of moisture near the electrical conductor.

3. The system according to claim 2, characterized in that the wiper system includes a means for wiping the glass, the wiper system is made responsive to the digital signal for actuating the means for wiping the glass in order to remove moisture from the surface.

4. The system according to claim 1, characterized in that the value of the specified target frequency is in one of the following ranges between 300 kHz and 700 kHz, and between 400 kHz and 600 kHz.

5. The system according to claim 1, characterized in that the substrate is a windshield of a vehicle having multiple bonded together by a transparent Lys is s, and electrical conductor is laid between the sheets.

6. The system according to claim 1, characterized in that the substrate is flexible.

7. The system according to claim 6, characterized in that it further includes a windshield of a vehicle having multiple transparent sheets, glued together and together with the flexible substrate, laid between them.

8. The system according to claim 7, characterized in that it further includes an electrically conductive coating located on the surface of at least one transparent sheet.

9. The system of claim 8, characterized in that the said surface is on the side of the flexible substrate opposite to the electrical conductor.

10. The system according to claim 6, characterized in that the flexible substrate is additionally at least one of the following items: a grounded conductor, located on a flexible substrate so that at least partially surround a specified electrical conductor, and an electrically conductive material located on the surface of the flexible substrate from the opposite side relative to the electrical conductor, and mentioned conductive material formed in the form of a Faraday screen.

11. The system according to claim 1, characterized in that the resonant circuit includes at SEB the oscillating circuit, with the capacitor and the inductor and connected in parallel between the specified electrical conductor and a source of reference voltage, and a resistor connected between the oscillator and the oscillating circuit by an electrical conductor.

12. The system according to claim 1, characterized in that the filter circuit includes a diode connected in such a way as to allow the current to flow from the cavity to an analog-to-digital Converter, and a capacitor connected between the output of the diode adjacent to the analog-to-digital Converter, and a voltage reference.

13. Detection system moisture containing situated on the substrate, means for passing an electric current, and the tool has a resonant frequency that varies depending on the amount of moisture that are near the specified means, an oscillator for supplying a specified means for passing an electric current signal of specified frequency and a first amplitude, means responsive to the signal from the oscillator, for supplying the resonant signal of a second amplitude, the value of which depends on the resonance frequency means passing current, and the second amplitude different from the first amplitude, and means responsive to the resonant signal, for hearth the control signal, the value of which depends on the value of the second amplitude of the resonant signal.

14. The system of item 13, characterized in that it further includes a wiper system that responds to the control signal, to remove moisture from the area adjacent to the tool, passing the current, based on such factors as the amount of moisture in the area adjacent to the specified tool, which passes current, and (or) the rate of accumulation of moisture in this zone.

15. The system of item 13, characterized in that the means of passing current, includes one of the following elements: one or more lines of conductive material, one or more strips of conductive material, and deposited in the form of one or more lines and / or strips of conductive particles.

16. The system of item 13, characterized in that the substrate is an insulating glass consisting of several glued together sheets of glass.

17. The system of clause 16, characterized in that the means of passing current, laid between sheets of glass.

18. The system of item 13, characterized in that the substrate is flexible and is connected with the sheet, and means passing current, has a resonant frequency varying depending on the amount of moisture within the specified list.

19. System p, characterized in that the additive is about includes a wiper system, posted by interoperable with the leaf and responsive to the control signal, for wiping the specified sheet based on such factors as the amount of moisture on the specified sheet and (or) the rate of accumulation on it of moisture.

20. System p, characterized in that the means of passing current, includes one or more lines of electrically conductive material located on a flexible substrate.

21. System p, characterized in that the sheet is a windshield consisting of several glued together sheets of glass.

22. The system according to item 21, characterized in that the flexible substrate is laid between sheets of glass.

23. System p, characterized in that on the specified flexible substrate optionally is at least one of the following items: a grounded conductor, located on a flexible substrate so that at least partially surround a specified tool, which passes current, and the corresponding conductive material located on the surface of the flexible substrate from the opposite side relative to the specified tools that allow current and mentioned conducting material moulded into the shape of the Faraday screen.

24. The system according to item 21, characterized in that it further includes the freight, made of electrically conductive material and located on the surface of at least one sheet.

25. The system of paragraph 24, characterized in that the said surface is on the side of the flexible substrate opposite to the side on which posted by means of passing current.

26. Method of moisture detection, providing: (a) the use of a substrate on which is located an electrical conductor, (b) excitation of the specified electrical conductor signal generator of oscillations of fixed frequency and fixed amplitude in the absence of moisture near electrical conductor, (C) determining a first amplitude of the electrical conductor when excited him at the stage (b), (d) excitation of the specified electrical conductor specified signal generator of oscillations of fixed frequency and fixed amplitude in the presence of moisture near the electrical conductor, (e) determining a second amplitude of the electrical conductor when the excitation him on stage (d), different from the first amplitude due to a change in resonance frequency of the electrical conductor in response to the presence of moisture in the area adjacent to the electrical conductor, and (f) determining the difference between the first and second amplitudes, the value of which depends on the amount of moisture in the area adjacent to electric is to the Explorer.

27. The method according to p, further comprising removing moisture in the area adjacent to the electrical conductor, with a rate depending on the obtained values of the specified difference between the first and second amplitudes.

28. The method according to p, further comprising implanting a substrate between at least two sheets of glass.

29. The method according to p, further comprising placing a shielding means, at least one of the following elements: a substrate and, on at least one of said glass sheets.

30. The method according to p, characterized in that the substrate is flexible.

31. The detection system of the moisture-containing substrate, an electrical conductor located on the substrate, means for initiating an electrical conductor signal generator of oscillations of fixed frequency and fixed amplitude, and the detection tool, sensitive to the signal generator and the electric conductor, to measure the change in resonant frequency of the electrical conductor in response to changes in the amount of moisture in the area adjacent to the electrical conductor.

32. System p, characterized in that the substrate is flexible.

33. System p, characterized in that it further comprises a sheet in contact with the substrate.

34. The system according to claim 3, characterized in that it further comprises means for removing moisture accumulating on the specified sheet, and control means, responsive to the signal detection means, to determine the status, when the removal tool, remove moisture from the sheet stuck on it moisture.

35. System 34, characterized in that the substrate is located either on the side of the sheet, where moisture accumulates, either side of the sheet, on which moisture does not accumulate.

36. System p, characterized in that the sheet is formed of several interconnected layers.

37. Detection system moisture containing tank for storing a liquid, an electrical conductor placed on the specified tank, means for initiating an electrical conductor signal generator of oscillations of fixed frequency and fixed amplitude, and means sensitive to the signal generator and the electric conductor, to measure the change in resonant frequency electrical conductor, depending on changes in the liquid level in the specified container and for supplying the control signal upon detection of such a change of resonant frequency of an electrical conductor, which corresponds to the lower than desired, the liquid level in the tank.

38. The system of clause 37, characterizes is the, that the electrical conductor is placed on a flexible substrate, located on the specified tank.



 

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FIELD: physics.

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The invention relates to electric vehicles, particularly to a method of system control cleaning the windscreen of the vehicle

The invention relates to electrical vehicles

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The invention relates to a method and device for controlling the drive wiper

The invention relates to electrical vehicles

The invention relates to the technical solutions designed for cleaning vehicles

The invention relates to electric vehicles, specifically to methods and devices motor control system of cleaning the windscreen of the car

Breaker wiper // 2129499
The invention relates to electric vehicles and is intended for use when implementing control of wipers of cars

FIELD: transport engineering; windshield wipers.

SUBSTANCE: proposed system contains shunt-wound dc motor connected to plus terminal of car electric circuit whose field winding 2 is provided with series resistor 3, three-position two-way mode changeover switch 4 and limit switch 5 whose first terminal is connected with minus terminal of armature of dc motor 1 and circuit of field winding 2. system is furnished additionally with mode changeover relay 6, power switch 7, generator 8 with timer 9, variable resistor 10, first fixed resistor 11 and second fixed resistor 12, diode 13, first capacitor 14 and second capacitor 15.

EFFECT: provision of optimized operation of windshield wiper system.

1 dwg

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