CN115568043A - Intelligent automobile glass defogging device based on infrared radiation and working method - Google Patents

Abstract

The invention discloses an intelligent automobile glass defogging device based on infrared radiation, an operating method and an automobile with the device. The electric heating strip is formed by laminating an insulating layer 1, an electric heating layer, a reflecting layer, an insulating layer 2 and a heat insulating layer. The electric heating strip is provided with a transmission device, and the far infrared rays emitted by the electric heating layer are focused through the reflecting layer, so that the infrared rays are emitted directionally. The control program can realize intelligent power on/off heating strip starting and heating strip scanning area setting by reading the surface temperature and humidity data of the glass. The electric heating strips emit far infrared rays to directly heat the far infrared absorption film on the inner surface of the automobile glass and the water mist attached to the far infrared absorption film, air and a glass body do not need to be heated in advance, quick demisting can be realized on the premise of not influencing the service life of the glass, and the problems of high energy consumption, easy damage to the glass and incomplete demisting of the existing scheme are solved.

Description

Intelligent automobile glass defogging device based on infrared radiation and working method

Technical Field

The invention belongs to the technical field of automobile glass demisting, and relates to a glass demisting working condition under a glass demisting condition caused by overhigh air humidity in an automobile or large temperature difference between glass and air in the automobile, in particular to an intelligent automobile glass demisting device based on infrared radiation and a working method.

Background

Because the humidity of air in the vehicle is high or the temperature difference between the air and the glass is high, the window glass generates a fogging phenomenon, the sight line is seriously influenced, and the driving of the vehicle is seriously influenced. Particularly, when the outdoor temperature is low (such as in winter) and the air humidity is high (in rainy days), passengers ventilate through the air conditioner, particularly when air conditioner warm air is used (when the passengers drive in winter, the passengers start the warm air and need the warm air), the window is easy to fog, even if the passengers wipe the window with the cleaning cloth, the fog can be quickly generated again, and the driving safety is seriously influenced.

There are currently four solutions:

(1) And (5) blowing and demisting the air conditioner. The method is used for demisting by blowing air against the glass through a vehicle-mounted air conditioner.

(2) And demisting the electric heating glass. The method is characterized in that an electric heating wire is added in the middle of a glass interlayer, and the glass is heated by the electric heating wire to remove fog.

(3) The surface of the glass is pasted with a hydrophobic film or coated with a hydrophobic coating. The method realizes demisting by pasting a hydrophobic film on the surface of the glass or spraying a hydrophobic coating.

(4) And (5) carrying out ultrasonic demisting. The method is characterized in that an ultrasonic wave emitting device is arranged in a vehicle, and the fog beads on the glass are vibrated and dispersed through the mechanical vibration of ultrasonic waves, so that the fog removal is realized.

The four solutions that exist today have the following problems:

(1) And (5) blowing and demisting the air conditioner. When the air conditioner blows hot air, most of heat of the method is dissipated by air and the glass body, the energy consumption is high, and the defogging speed is low. When the ambient temperature is lower, blow hot-blast can cause bigger fog sometimes, perhaps the inside and outside humidity of car is too big, does not play the effect of defogging. When the air conditioner blows cold wind, before the air conditioner produces effective refrigerating capacity, blow out that air temperature is not low enough but aggravates the door window and hazes, causes driving danger easily, moreover in cold weather, the passenger can't accept the air conditioner and opens cold wind. Whether hot air or cold air is blown, the scheme is difficult to demist the side window, and the side window is also very important to driving safety.

(2) And demisting the electric heating glass. According to the method, the glass can be demisted only after being heated, the situation that the local temperature is too high is easily caused by the heating wire arranged in the glass, the service life of the glass is obviously influenced, part of energy of the scheme is dissipated by the glass body and air, and the energy consumption is high.

(3) The surface of the glass is pasted with a hydrophobic film or coated with a hydrophobic coating. The method has a common defogging effect, and due to factors such as dust, oil and dirt, the defogging function is easy to attenuate, and the service life is short.

(4) And (5) carrying out ultrasonic demisting. The method is a technical scheme proposed in recent years, and no practical application case is found. The method vibrates and disperses fog through ultrasonic waves, but cannot reduce air humidity and temperature difference between air and glass essentially, namely objective conditions of glass fogging are not changed, so that a defogging mode must be continuously started under the condition that a vehicle is not ventilated. In addition, the method needs to arrange an ultrasonic emission device with a larger area at the position of the center console. The device has a plurality of opening structures, dust is easy to accumulate, bacteria are bred, and health hidden troubles are caused. Moreover, the center console is the area most touched by the eyes of passengers, and all the automobile manufacturers strive to improve the sensory quality of the center console area. The installation of the ultrasonic device undoubtedly has great influence on the texture and the grade of the whole vehicle, and is difficult to be accepted by users.

The above four schemes are all used for uniformly heating the whole glass domain, and intelligent demisting for local areas cannot be realized.

The existing demisting scheme for the automobile glass has the problems of low demisting efficiency, high energy consumption, easy damage to the glass, short service life, difficult improvement of appearance, easy accumulation of dust and bacteria and the like.

The invention provides a glass defogging device based on infrared radiation heating. Because the hydrone has extremely strong absorptive capacity to the infrared ray, consequently infrared radiation energy can be fast and high-efficiently absorbed by glass surface hydrone, and then evaporates, realizes the defogging. Meanwhile, the transparent far infrared absorption film (such as a transparent resin film) on the inner surface of the vehicle window glass is also rapidly heated, so that the temperature difference between the glass and air is reduced, the condition for generating fog is destroyed, and the problem of glass fogging is thoroughly solved. The invention has the advantages of high demisting speed and low energy consumption because most of energy is concentrated on the fog beads and the surface of the glass, and a few of energy is absorbed by the glass body without heating air. As the fog beads and the surface of the glass are mainly heated, the glass absorbs less heat and is uniformly heated, and the performance of the glass cannot be damaged. Compared with an ultrasonic demisting device, the device provided by the invention has the advantages that the electric heating strips do not have mechanical movement except for the rotating device outside the electric heating strips, the damage such as corrosion and vibration is not easy to occur, and the service life is long. The invention has smooth surface, can design various individual patterns, has high sensory quality and is not easy to accumulate dust and bacteria.

Especially for the electric automobile, the electric automobile is very sensitive to power consumption, and the user is also easy to generate mileage anxiety, so the energy-saving characteristic of the defogging device is very critical.

In addition, the present invention provides an intelligent control program. The control program intelligently determines the starting and stopping of the electric heating strips, the power, the rotating angle and the rotating speed by reading the parameters of the humidity sensor and the temperature sensor, so that the key heating of key local areas can be realized, and the heating speed and the energy utilization rate are improved. In addition, the intelligent control device reduces manual operation of personnel and improves driving safety.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides an intelligent automobile glass defogging device based on infrared radiation, an operating method and an automobile with the intelligent automobile glass defogging device.

The technical scheme is as follows: an intelligent automobile glass defogging device based on infrared radiation comprises connecting and conductive auxiliary materials such as a heating strip, a transmission device, a transparent far infrared absorption film, a humidity sensor, a temperature sensor, a control chip, an overload protection device, a vehicle-mounted power supply, a lead and the like;

the electric heating strips are electrified to emit infrared rays to perform defogging work; the electrothermal layer in the electrothermal strip needs to emit infrared rays with a higher proportion; the electric heating strip is of a layered composite structure, and all layers can be bonded through heat-resistant glue, or coated through a base material, or connected in a manner of installing a fastener at the end part;

the electrothermal strip is of a layered composite structure and sequentially comprises an insulating layer 1, an electrothermal layer, a reflecting layer, an insulating layer 2 and a heat insulating layer from top to bottom, and the reflecting layer is arranged on the side surface of the electrothermal strip; wherein, the insulating layer 1 is required to be insulating and heat-resistant and can transmit infrared rays with a higher proportion, or insulating and heat-resistant and can absorb and emit infrared rays; the electric heating layer is composed of carbon fiber, graphene, carbon crystal, carbon black, tourmaline and the like, and is provided with a sheet-shaped electric heating material or coating which can emit infrared rays in a higher proportion when being electrified; the reflecting layer is a thin sheet or a coating which can reflect infrared rays in a higher proportion; the insulating layer 2 is made of an insulating heat-resistant material, and has no requirement on the infrared characteristic; the heat insulation layer is a sheet material or a coating with a heat insulation function; if the electric heating strip can not form a solid structure with mechanical property meeting the requirement, the electric heating strip needs to be coated by a substrate with higher mechanical property, wherein the surface of the substrate which is in contact with the insulating layer 1 needs to be permeable to infrared rays, and the rest surfaces have no requirements on optical and thermal properties;

the end part of the electric heating strip is mechanically connected with the transmission device, the end part of an electric heating layer in the electric heating strip is provided with a connecting terminal and a power supply lead, and the connecting terminal of the electric heating layer is connected with the power supply lead through a metal coating; the connecting terminal is in a metal coating form; the power supply lead can be connected with the connecting terminal in a welding and plating mode, and can be in a lead mode or a plug interface;

the temperature sensor is adhered to the proper position of the electric heating layer in the electric heating strip to determine whether the temperature of the electric heating layer is in a normal working interval or not;

the transmission device consists of an electrode and a linkage mechanism and can control the electric heating strips to rotate for a certain angle;

a layer of transparent far infrared absorption film (such as a transparent resin film) can be pasted on the inner surface of the vehicle window glass, so that part of far infrared rays can be absorbed, the inner surface of the vehicle window glass is heated, and the fogging condition is eliminated.

The humidity sensor is adhered to one side of the inner surface of the window glass, needs to be exposed in air and can be distributed up and down or left and right, and the distribution density is set according to the requirement of rotation sensitivity; the humidity sensor is made of sheet materials and transmits signals to the control chip through a lead; the humidity sensor transmits the surface humidity and the position of the car window glass to the control chip; the control chip judges whether the electric heating strips need to be started or not and adjusts the power, the rotating speed and the rotating angle of the electric heating strips through a built-in program;

the control chip can read the humidity and position data of the humidity sensor and the temperature data of the temperature sensor through a built-in program, and logically controls the heating power, the rotating speed and the rotating angle of the electric heating strips according to the built-in program.

The electric heating strip is connected with the overload protection device to avoid overload caused by accidents such as clamping of the electric heating strip and the like.

As an optimization: the specific material type of each layer can be changed according to the design requirement of the product, and the insulating layer 1 can be made of infrared-transmitting quartz glass; the material of the electric heating layer can be carbon fiber paper, graphite paper, tourmaline, and electric heating material or coating with power-on infrared ray emission; the reflecting layer can be aluminum foil; the insulating layer 2 can be a common ceramic plate; the heat insulation layer can be glass fiber cloth; the coating matrix can be common glass or transparent resin.

As an optimization: if the surface temperature of the electric heating layer is lower or slightly higher but the arrangement position is not easy to contact, the insulating layer can be absent, and if the product is not sensitive to the energy-saving requirement, the reflecting layer and the heat insulating layer can be absent; but consider general design demand, can prevent to electrocute the electric leakage through setting up the insulating layer, set up the reflection stratum and can focus infrared ray, improve heat utilization rate and directional emissivity, set up the reducible heat loss of insulating layer and protect the electric heat strip and the contact surface of other objects, avoid the thermal damage.

As an optimization: when a material has both insulation and heat insulation and reflects infrared rays, the insulation layer, the reflection layer and the heat insulation layer may be optionally replaced by one or two materials, and need not be three materials respectively.

As an optimization: the transparent far infrared absorption film can be changed according to the design requirements of products, and only has the characteristics of transparency and better far infrared absorption performance, for example, a transparent resin film can be adopted. If the car window glass has better far infrared absorption characteristic, the transparent far infrared absorption film can not be attached.

As an optimization: the humidity sensor and the temperature sensor can adopt a sheet-shaped humidity sensitive element and a heat sensitive element, are convenient to be stuck in a vehicle window and an electric heating strip, and do not influence the appearance.

As an optimization: the electrothermal strips are arranged at the position of the frame of the car window, and can be set at one side or multiple sides of the frame according to the power and the requirement of the product.

As an optimization: the humidity sensor is adhered to one side of the edge of the inner surface of the glass, and transmits the surface humidity and position data of the glass to the control chip.

As an optimization: the electric heating strip, the temperature sensor, the humidity sensor, the transmission device, the control chip, the overload protection device and the vehicle-mounted power supply form a complete control system through connecting modes such as a lead and the like. The electric heating bar can be electrified to heat; the control chip reads the data of the temperature sensor inside the electric heating strip and the humidity and position data of the humidity sensor through the built-in program, determines the heating power and the rotation angle of the electric heating strip based on the logic of the built-in program, and controls the electric heating strip to execute instructions through the transmission device.

The working method of the intelligent defogging device for the automobile glass based on the infrared radiation comprises the following steps:

s1, reading data of a humidity sensor and a temperature sensor.

S2, judging whether the surface humidity of the glass exceeds a critical value and whether the surface temperature of the electric heating strip is in a reasonable working interval.

S3, if the judgment result of the S2 is no, displaying prompt information and inquiring whether to start a manual control mode; if the user selects not to start the manual control mode, the demisting system stops working; and if the user selects to start the manual control mode, controlling the start and stop of the electrothermal strip, the heating power and the rotation parameters through the manual control interface.

And S4, if the judgment result of the S2 is yes, the transmission device tries to rotate the electric heating strip to the initial set angle, and judges whether the electric heating strip successfully completes the specified action.

S5, if the judgment result in the S4 is negative, displaying prompt information and inquiring whether to start a manual control mode or not; if the user selects not to start the manual control mode, the demisting system stops working; and if the user selects to start the manual control mode, controlling the start and stop of the electric heating strip, the heating power and the rotation parameters through the manual control interface.

And S6, if the judgment result of S4 is yes, the electric heating strips are electrified.

And S7, comparing the humidity of each point on the inner surface of the glass by the control program through the data of the humidity sensor, and finding out two points which have the humidity exceeding a critical value and are farthest away from each other along the direction vertical to the electric heating strips.

And S8, calculating the rotation angle of the electric heating strip by the control program based on the positions of the two points selected in the S7 and the position of the electric heating strip.

And S9, according to the calculated angle, the control program sends out an instruction to control the electric heating strip to start scanning and heating.

S10, a control program reads data of each humidity sensor in real time and judges whether the humidity of all points is lower than a set value; if the judgment result is not yes, executing S7; if the judgment result is yes, the electric heating strip stops heating and returns to the initial position.

An automobile with the defogging device or the defogging working method adopts the defogging device or the defogging working method.

Has the advantages that: the heating mode of the electric heating strip provided by the invention mainly adopts infrared radiation, and the infrared wavelength is controlled to be about 1-25 microns by selecting a special infrared radiation material, so that the resonance wavelength of water molecules at different temperatures is covered. Water molecules have extremely high infrared absorption efficiency in a resonance waveband, and are similar to a black body, while glass has good infrared transmission characteristic, so that heat is mainly absorbed by water, and the temperature change of the glass is small. The transparent far infrared absorption film coated on the inner surface of the glass can raise the temperature of the inner surface of the glass. The invention has the advantages that the water mist can be rapidly and uniformly heated, the fogging condition is eliminated, the aim of demisting is realized, and the obvious energy-saving effect is achieved; meanwhile, the glass temperature is not uneven, so that the service life of the glass is not influenced; the installation is very convenient, and the large-scale application is convenient; the surface of the electric heating strip can be smooth or designed with different patterns, thus being simple and beautiful. The intelligent electric control device can realize automatic demisting, automatic start and stop, reduce demisting energy consumption, reduce driver operation and improve driving safety.

The specific advantages of the invention are as follows:

(1) Quick demisting: the heat of the electric heating strip is mainly emitted in an infrared radiation mode, and an infrared frequency band can cover the resonance frequency of water molecules, so that the water molecules are resonated, and quick heating demisting is realized. The transparent far infrared absorption film is pasted on the inner surface of the glass, so that the temperature of the inner surface of the glass can be quickly raised, the objective condition of glass fogging is changed, and thorough demisting can be realized.

(2) Energy conservation: the infrared frequency band can cover the resonance frequency of water molecules, glass absorbs infrared rays weakly, and air absorbs infrared rays weakly, so that infrared radiation heat is mainly absorbed by the water molecules on the surface of the glass, invalid waste of heat caused by heating the glass and the air in the initial heating stage is avoided, the heat utilization rate is improved, and energy conservation is realized.

(3) The service life of the glass is not influenced: because the glass body has weaker absorption capacity to far infrared rays, the infrared radiation demisting method mainly heats water mist on the surface of the glass and the far infrared absorption film stuck on the inner surface of the glass, so the heating is more uniform, the temperature change of the glass body is not large, the service life of the glass is not influenced,

(3) Intelligence: the intelligent start-stop of the electric heating device is realized through the humidity sensor and the control chip; through control, the rotation angle of the electric heating strips is concentrated in the water mist area, and intelligent scanning heating is realized.

(4) Health: the infrared heating mode does not need to blow hot air, so that the flying of dust in the cabin caused by air flow is avoided; the surface of the electric heating strip is smooth and has no gap, so that dust accumulation and bacterial breeding are avoided.

(5) The appearance is beautiful: the heating strip can be designed into a whole, for example, the heating strip and the connecting device are encapsulated by glass or transparent resin, and are integrated. The surface of the electric heating strip can also be designed with artistic patterns according to requirements. With the emphasis of the user on the sensory quality of the automobile, the aesthetic advantage of the automobile sensory quality is more prominent, and the feasibility of mass production application is obviously improved.

(6) Easy installation: the electric heating strip, the related heat-sensitive and video sensor and the transparent far infrared absorption film on the inner surface of the glass can be directly arranged in the vehicle, and the automobile windshield and other parts do not need to be assembled and disassembled, and the electric heating strip, the related heat-sensitive and video sensor and the transparent far infrared absorption film on the inner surface of the glass do not need to be arranged in the vehicle production process in advance. The user can adopt the invention to refit the purchased vehicle according to the self requirement.

Drawings

FIG. 1 is a schematic diagram of the apparatus of the present invention;

FIG. 2 is a schematic view of the structure of the electrical heating bar of the present invention;

FIG. 3 is a schematic view of the connection of the electrical heating strips of the present invention;

FIG. 4 is a logic diagram of the control program of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art based on the embodiments described herein are intended to be within the scope of the present invention.

Examples

As shown in fig. 1-4, an intelligent defogging device for automobile glass based on infrared radiation comprises a heating strip, a transmission device, a transparent far infrared absorption film, a humidity sensor, a temperature sensor, a control chip, an overload protection device, a vehicle-mounted power supply, a wire and other necessary connecting and conducting auxiliary materials.

The electric heating strips are electrified to emit infrared rays to perform defogging work. The electrothermal layer in the electrothermal strip needs to emit a higher proportion of infrared light. The electric heating strips are of a layered composite structure, all layers can be bonded through heat-resistant glue, or coated through base materials, or connected in a manner of installing fasteners at the end parts and the like, and the electric heating strips only need to be integrally sealed and have certain mechanical strength.

The electrothermal strip is of a layered composite structure and sequentially comprises an insulating layer 1, an electrothermal layer, a reflecting layer, an insulating layer 2 and a heat insulating layer from top to bottom, and the reflecting layer is arranged on the side face of the electrothermal strip. Wherein, the insulating layer 1 is required to be insulating, heat-resistant and transparent to infrared rays with a high proportion (such as infrared-transparent quartz glass), or insulating, heat-resistant and absorptive and reflective to infrared rays (such as epoxy resin sheet, or glass, metal sheet, plastic sheet coated with infrared-emitting functional coating); the electric heating layer is composed of carbon fiber, graphene, carbon crystal, carbon black, tourmaline and the like, and is provided with a sheet material or a coating which can emit infrared rays in a higher proportion when being electrified; the reflecting layer is a sheet (such as aluminum foil) or a coating (such as an aluminum coating) which can reflect infrared rays in a high proportion; the insulating layer 2 is made of insulating heat-resistant material, and has no requirement on infrared characteristics; the heat insulation layer is a sheet material (such as a glass fiber sheet, a vacuum thin plate and the like) or a coating (such as a heat insulation ceramic coating) with a heat insulation function. If the electric heating strip can not form a solid structure with the mechanical property meeting the requirement, the electric heating strip needs to be coated by a substrate with higher mechanical property, wherein the surface of the substrate, which is in contact with the insulating layer 1, needs to be transparent to infrared rays, and the rest surfaces have no requirements on optical and thermal properties.

The specific material type of each layer may be altered according to product design needs. The insulating layer 1 can be set as infrared-transmitting quartz glass, the infrared-transmitting function of the insulating layer can ensure that infrared rays are radiated as far as possible, the quartz glass has a high heat-insulating and heat-resisting function, the surface temperature of the electric heating strip can be ensured not to be too high, the surface of the quartz glass is smooth and attractive, personalized patterns can be designed, and the insulating layer has good sensory quality. The electric heating layer can be made of carbon fiber paper, graphite paper, tourmaline and the like, and can be made of materials or coatings capable of emitting infrared rays when being electrified. Wherein, the carbon fiber and other materials have high infrared radiation ratio, the infrared frequency is close to the resonance frequency of water molecules, and the energy can be saved more efficiently. The reflecting layer can be aluminum foil, because the aluminum foil has low cost, high heat reflecting performance and easy forming. The insulating layer 2 can be a common ceramic sheet, and has low cost and good mechanical property. The heat insulating layer can be made of glass fiber cloth, and has low cost and good heat insulating performance. The coating substrate can be common glass or transparent resin, can form a transparent whole with the insulating layer 1, has smooth and attractive surface, is not easy to accumulate dust and bacteria, and has good mechanical property.

Note that when a material has both insulating and heat insulating properties and reflects infrared rays, the insulating layer, the reflective layer, and the heat insulating layer may be optionally replaced with one or two materials, and need not be three materials.

If the surface temperature of the electric heating layer is lower or slightly higher but the arrangement position is not easy to contact, the insulating layer can be absent, and if the product is not sensitive to the energy-saving requirement, the reflecting layer and the heat insulating layer can be absent. But consider general design demand, can prevent to electrocute the electric leakage through setting up the insulating layer, set up the reflection stratum and can focus infrared ray, improve heat utilization ratio and directional emissivity, set up the reducible heat loss of insulating layer and protect the electric heat strip and the contact surface of other objects, avoid the thermal damage.

The electric heating strips are arranged at the position of the frame of the car window, and can be set at one side or multiple sides of the frame according to the power and the requirement of a product.

The end part of the electric heating strip is mechanically connected with a transmission device. The electric heating layer tip in the electric heat strip has connecting terminal and power wire, and the connecting terminal on electric heating layer passes through metal coating and power wire to be connected, because metal coating can be connected with electric heating layer better, guarantees electrically conductive effect, and the wire is soft be convenient for install. The connecting terminal is in a metal coating form, so that good contact with the electric heating layer is ensured; the power supply lead can be connected with the connecting terminal in the forms of welding, plating and the like, and can be in the form of a lead or a plug interface and the like.

A temperature sensor is attached to a certain point of the electric heating layer, and the temperature of the electric heating strip is transmitted to a control program to determine whether the temperature of the electric heating layer is in a normal working interval.

The transmission device is a rotating motor and a related connecting mechanism. The transmission device consists of an electrode and a linkage mechanism, the form is not limited, and the electric heating strip can be controlled to rotate by a certain angle.

The inner surface of the car window glass can be pasted with a layer of transparent far infrared absorption film (such as transparent resin film) for absorbing the heat emitted by part of the electric heating strips, improving the temperature of the inner surface of the glass and eliminating the fog generating condition. The transparent far infrared absorption film can be changed according to the design requirement of the product, and only has the characteristics of transparency and better far infrared absorption performance, for example, a transparent resin film can be adopted. If the car window glass has better far infrared absorption characteristic, the transparent far infrared absorption film can not be attached.

The humidity sensor is adhered to one side of the inner surface of the window glass, needs to be exposed in the air and can be distributed up and down or left and right, and the distribution density is set according to the requirement of rotation sensitivity. The humidity sensor is made of sheet materials and transmits signals to the control chip through a lead and the like. The humidity sensor transmits the surface humidity and the position of the car window glass to the control chip. The control chip judges whether the electric heating strip needs to be started or not and adjusts the power, the rotating speed and the rotating angle of the electric heating strip through a built-in program.

The humidity sensor and the temperature sensor can adopt a sheet-shaped humidity sensitive element and a heat sensitive element, are convenient to be stuck in a vehicle window and an electric heating strip, and do not influence the appearance.

The control chip can read the humidity and position data of the humidity sensor and the temperature data of the temperature sensor through a built-in program, and logically controls the heating power, the rotating speed and the rotating angle of the electric heating strips according to the built-in program.

The built-in program of the control chip adds humidity, temperature and position reading commands and can be used for controlling the rotation of the electric heating strips, the built-in program control logic is shown in figure 4, and the specific program implementation method is well known in the programming industry.

The electric heating strip is connected with an overload protection device to avoid overload caused by accidents such as clamping of the electric heating strip and the like.

An intelligent demisting working method for automobile glass based on infrared radiation comprises the following steps:

and S1, reading data of a humidity sensor and a temperature sensor.

S2, judging whether the surface humidity of the glass exceeds a critical value and whether the surface temperature of the electric heating strip is in a reasonable working interval.

S3, if the judgment result of the S2 is no, displaying prompt information and inquiring whether to start a manual control mode; if the user selects not to start the manual control mode, the demisting system stops working; and if the user selects to start the manual control mode, controlling the start and stop of the electric heating strip, the heating power and the rotation parameters through the manual control interface.

And S4, if the judgment result of the S2 is yes, the transmission device attempts to rotate the electric heating strip to the initial set angle, and judges whether the electric heating strip successfully completes the specified action.

S5, if the judgment result in the S4 is negative, displaying prompt information and inquiring whether to start a manual control mode or not; if the user selects not to start the manual control mode, the demisting system stops working; and if the user selects to start the manual control mode, controlling the start and stop of the electrothermal strip, the heating power and the rotation parameters through the manual control interface.

And S6, if the judgment result of S4 is yes, the electric heating strips are electrified.

And S7, comparing the humidity of each point on the inner surface of the glass by the control program through the data of the humidity sensor, and finding out two points which have the humidity exceeding a critical value and are farthest away in the direction vertical to the electric heating strips.

And S8, calculating the rotation angle of the electric heating strip by the control program based on the positions of the two points selected in the S7 and the position of the electric heating strip.

And S9, according to the calculated angle, the control program sends out an instruction to control the electric heating strip to start scanning and heating.

S10, a control program reads data of each humidity sensor in real time and judges whether the humidity of all points is lower than a set value or not; if the judgment result is not yes, executing S7; if the judgment result is yes, the electric heating strip stops heating and returns to the initial position.

The logic of the control chip is shown in fig. 4. The limit values for humidity and temperature are determined by measurement.

In the invention, the electric heating strip is of a layered composite structure and sequentially comprises an insulating layer 1, an electric heating layer, a reflecting layer, an insulating layer 2, a heat insulating layer and a reflecting layer arranged on the side surface from top to bottom. The insulating layer 1 is used for insulation, so that the electricity utilization safety of a user is ensured; the insulating layer 1 can be an insulating wave-transmitting heat-insulating material, can ensure that the surface temperature is not too high and can be used for heating the surface of the glass by transmitting infrared rays; insulating layer 1 also can adopt the insulating infrared ray material of launching, guarantees the heat energy of electric heat layer and can be absorbed by this insulating layer and launch with infrared radiation's form once more in insulating while, and at this moment, the electric heat strip need be installed in the position that the user is difficult for touching. The electric heating layer is a material capable of emitting infrared rays after being electrified, wherein the material of the infrared rays occupies a higher proportion so as to ensure that most of heat is radiated in an infrared ray mode, and the infrared ray radiation occupies a higher proportion than the maximum. The reflective layer is used to reflect heat in a particular direction, reducing energy dissipation. The insulating layer 2 is made of insulating materials, is used for protecting the electricity utilization safety of users, and has no special requirement on the infrared property. The heat insulation layer is a heat insulation material and is used for reducing energy dissipation and protecting the thermal safety of the installation part.

In the invention, the humidity sensor is used for measuring the humidity data of the glass surface and transmitting the data to the control chip. The control chip controls the power and the rotation angle of the electric heating strip through a built-in program. The transmission motor is connected with an overload protection device in series and used for avoiding overload damage caused by accidents such as electric heating strip clamping and the like. The temperature sensor is pasted inside the electric heating strip and used for measuring the working temperature data of the electric heating strip and transmitting the data to the control chip and used for controlling the power of the electric heating strip and avoiding the overheating of the electric heating strip.

Compared with the prior art, the invention provides the infrared radiation electrothermal strip, most of heat generated by the infrared radiation electrothermal strip can be heated by water molecules, and a small part of heat is absorbed by air and the glass body and preferentially heats the water molecules, so that the energy utilization rate is obviously improved, the energy-saving effect is realized, the life defect that the air-conditioning blowing demisting phenomenon is possibly intensified to generate fog is overcome, and the problem that the service life of the electrothermal glass is influenced by large local temperature difference is also avoided.

The electric heating strip provided by the invention has a layered structure of the insulating layer 1, the electric heating layer, the reflecting layer, the insulating layer 2 and the heat insulating layer, can realize directional infrared ray emission, is cooperated with the transmission device and the control chip, realizes intelligent heating by controlling the scanning angle of the electric heating strip in real time, concentrates heat in an effective area with water mist, and intelligently starts and stops, and maximally reduces demisting energy consumption.

The electric heating strip is packaged by adopting a material with excellent mechanical property, so that the surface is smooth and attractive, and dust accumulation and bacterial breeding are avoided.

Claims (10)

1. The utility model provides an automobile glass intelligence defogging device based on infrared radiation which characterized in that: comprises connecting and conducting necessary auxiliary materials such as an electric heating bar, a transmission device, a transparent far infrared absorption film, a humidity sensor, a temperature sensor, a control chip, an overload protection device, a vehicle-mounted power supply, a lead and the like;

the electric heating strips are electrified to emit infrared rays, so that demisting work is performed; the electrothermal layer in the electrothermal strip needs to emit infrared rays with a higher proportion; the electric heating strips are of a layered composite structure, and all layers can be bonded through heat-resistant glue, or coated through a base material, or connected in a mode of installing a fastener at the end part;

the electrothermal strip is of a layered composite structure and sequentially comprises an insulating layer 1, an electrothermal layer, a reflecting layer, an insulating layer 2 and a heat insulating layer from top to bottom, and the reflecting layer is arranged on the side surface of the insulating layer; wherein, the insulating layer 1 is a material which is insulating and heat-resistant and can transmit a higher proportion of infrared rays, or a material which is insulating and heat-resistant and can absorb and emit infrared rays; the electric heating layer is a sheet-shaped electric heating material or coating which can emit infrared rays with higher proportion when being electrified; the reflecting layer is a thin sheet or a coating which can reflect infrared rays in a higher proportion; the insulating layer 2 is made of insulating heat-resistant material, and has no requirement on infrared characteristics; the heat insulation layer is a sheet material or a coating with a heat insulation function; if the electric heating strip can not form a solid structure with mechanical property meeting the requirement, the electric heating strip needs to be coated by a substrate with higher mechanical property, wherein the surface of the substrate which is in contact with the insulating layer 1 needs to be permeable to infrared rays, and the rest surfaces have no requirements on optical and thermal properties;

the end part of the electric heating strip is mechanically connected with the transmission device, the end part of an electric heating layer in the electric heating strip is provided with a connecting terminal and a power supply lead, and the connecting terminal of the electric heating layer is connected with the power supply lead through a metal coating; the connecting terminal is in a metal coating form; the power supply lead can be connected with the connecting terminal in a welding and plating mode, and can be in a lead mode or a plug interface;

the temperature sensor is stuck at a proper position of the electric heating layer in the electric heating strip and used for determining whether the temperature of the electric heating layer is in a normal working range or not;

the transmission device consists of a motor and a linkage mechanism and can control the electric heating strips to rotate for a certain angle;

the transparent far infrared absorption film is adhered to the inner surface of the vehicle window glass and is used for improving the absorption capacity of the inner surface of the vehicle window glass to the far infrared rays and rapidly increasing the temperature of the inner surface of the glass under the irradiation of the far infrared rays;

the humidity sensor is adhered to one side of the inner surface of the window glass, needs to be exposed in air and can be distributed up and down or left and right, and the distribution density is set according to the requirement of rotation sensitivity; the humidity sensor is made of sheet materials and transmits signals to the control chip through a lead; the humidity sensor transmits the surface humidity and the position of the car window glass to the control chip; the control chip judges whether the electric heating strips need to be started or not and adjusts the power, the rotating speed and the rotating angle of the electric heating strips through a built-in program;

the control chip can read the humidity and position data of the humidity sensor and the temperature data of the temperature sensor through a built-in program, and logically controls the heating power, the rotating speed and the rotating angle of the electric heating bar according to the built-in program;

the electric heating strip is connected with the overload protection device to avoid overload caused by accidents such as clamping of the electric heating strip and the like.

2. The intelligent defogging device for automobile glass based on infrared radiation as recited in claim 1, wherein: the specific material type of each layer can be changed according to the design requirement of a product, and the insulating layer 1 can be made of infrared-transmitting quartz glass; the electric heating layer can be made of carbon fiber paper, graphite paper, tourmaline, and electric heating material or coating capable of emitting infrared ray when electrified; the reflecting layer can be aluminum foil; the insulating layer 2 can be a common ceramic sheet; the heat insulation layer can be glass fiber cloth; the coating matrix can be common glass or transparent resin.

3. The intelligent defogging device for automobile glass based on infrared radiation as recited in claim 1, wherein: if the surface temperature of the electric heating layer is low or slightly higher but the arrangement position is not easy to contact, the insulating layer can be absent, and if the product is not sensitive to the energy-saving requirement, the reflecting layer and the heat insulation layer can be absent; but consider general design demand, can prevent to electrocute the electric leakage through setting up the insulating layer, set up the reflection stratum and can focus infrared ray, improve heat utilization rate and directional emissivity, set up the reducible heat loss of insulating layer and protect the electric heat strip and the contact surface of other objects, avoid the thermal damage.

4. The intelligent defogging device for automobile glass based on infrared radiation as recited in claim 1, wherein: when a certain material has insulating and heat insulating functions and reflects infrared rays, the insulating layer, the reflecting layer and the heat insulating layer can be optionally replaced by one or two materials.

5. The intelligent defogging device for automobile glass based on infrared radiation as recited in claim 1, wherein: the transparent far infrared absorption film can be changed according to the design requirement of a product, only has the characteristics of transparency and better far infrared absorption performance, and can adopt a transparent resin film; if the car window glass has better far infrared absorption characteristic, the transparent far infrared absorption film can not be attached.

6. The intelligent defogging device for automobile glass based on infrared radiation as recited in claim 1, wherein: the electric heating strip is arranged at the position of the frame of the car window, and can be set at one side or multiple sides of the frame according to the product power and the requirement.

7. The intelligent defogging device for automobile glass based on infrared radiation as recited in claim 1, wherein: the humidity sensor and the temperature sensor can adopt a sheet-shaped humidity sensitive element and a heat sensitive element, are convenient to be stuck in a vehicle window and an electric heating strip, and do not influence the appearance; the humidity sensor is adhered to one side of the edge of the inner surface of the glass, and transmits the surface humidity and the position data of the glass to the control chip.

8. The intelligent defogging device for automobile glass based on infrared radiation as recited in claim 1, wherein: the electric heating strip, the temperature sensor, the humidity sensor, the transmission device, the control chip, the overload protection device and the vehicle-mounted power supply form a complete control system in a wire connection mode, and the electric heating strip can be electrified to heat; the control chip reads the data of the temperature sensor inside the electric heating strip and the humidity and position data of the humidity sensor through the built-in program, determines the heating power and the rotation angle of the electric heating strip based on the logic of the built-in program, and controls the electric heating strip to execute instructions through the transmission device.

9. The working method of the intelligent defogging device for the automobile glass based on the infrared radiation as recited in claim 1, wherein: the method comprises the following steps:

s1, reading humidity and temperature sensor data;

s2, judging whether the surface humidity of the glass exceeds a critical value and whether the surface temperature of the electric heating strip is in a reasonable working interval;

s3, if the judgment result in the S2 is no, displaying prompt information and inquiring whether to start a manual control mode or not; if the user selects not to start the manual control mode, the demisting system stops working; if the user selects to start the manual control mode, controlling the start and stop of the electrothermal strip, the heating power and the rotation parameters through a manual control interface;

s4, if the judgment result of the S2 is yes, the transmission device tries to rotate the electric heating strip to the initial set angle and judges whether the electric heating strip successfully completes the specified action or not;

s5, if the judgment result in the S4 is negative, displaying prompt information and inquiring whether to start a manual control mode or not; if the user selects not to start the manual control mode, the demisting system stops working; if the user selects to start the manual control mode, controlling the start and stop of the electrothermal strip, the heating power and the rotation parameters through a manual control interface;

s6, if the judgment result of S4 is yes, electrifying the electric heating strips;

s7, comparing the humidity of each point on the inner surface of the glass by a control program through the data of a humidity sensor, and finding out two points with the humidity exceeding a critical value and the farthest distance along the direction vertical to the electric heating strips;

s8, the control program calculates the rotation angle of the electric heating strip based on the two points selected in the S7 and the position of the electric heating strip;

s9, according to the calculated angle, the control program sends out an instruction to control the electric heating strip to start scanning and heating;

s10, a control program reads data of each humidity sensor in real time and judges whether the humidity of all points is lower than a set value; if the judgment result is not yes, executing S7; if the judgment result is yes, the electric heating strip stops heating and returns to the initial position.

10. An automobile adopting the defogging device or the defogging working method is characterized in that: a defogging device including any one of claims 1 through 9.

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