KR20090020914A - Defogging system using light emitting device for a vehicle and control method thereof - Google Patents

Abstract

A defrosting system using a light emitting device is provided, which minimizes error by being input the specific frequency and minimizes the loss of the light. A defrosting system using a light emitting device comprises: a light emitting device(10) outputting the light toward the front glass of a vehicle; a first light-collecting unit(20) centralizing the light outputted from the light emitting device to the front glass; a second light-collecting unit(40) in which the light of the first light-collecting unit is reflected from the front glass and is inputted; a light receiving element(50) in which the light inputted in the second light-collecting unit and reflected is concentrated and is inputted; and a controller(60) which outputs the steam/frost removing control signal if the value exceeds the set up critical value.

Description

Defogging System Using Light Emitting Device for a Vehicle and Control Method

The present invention relates to a defogging system and a control method using a light emitting device, by using a light emitting device that can automatically remove the fog generated on the windshield of the vehicle to secure the driver's field of view and to remove the dispersing concentration of drivers Defogging system and control method.

In general, the defogging system detects whether fog occurs early in the wind shield, which is the windshield of the vehicle, and suppresses the occurrence of fog. By removing this early, the driver's safety is ensured by ensuring a smooth watch.

To this end, a sensor for detecting water vapor and frost attached to the windshield of the vehicle is attached, and a fog is generated when the humidity inside the car is high and the outdoor temperature is low to drive a defogging system to prevent the generation of water vapor and frost. Inhibits and removes already generated water vapor and frost.

The sensor consists of a temperature sensor that detects the surface temperature of the windshield of the vehicle and a humidity sensor that senses humidity. The sensor calculates the dew point temperature using a function of temperature and humidity. It depends on whether it can be predicted and consists of various forms to obtain the optimum dew point temperature.

In addition, an infrared light emitting unit and a light receiving unit may be installed to detect the generation of water vapor and frost from a change in the amount of infrared ray transmission and reception. A separate transmitting and receiving circuit is configured.

However, in case of temperature fluctuation due to disturbance such as air flow inside the vehicle, the defogging system using dew point cannot know the temperature distribution according to air conditioning and vehicle status, and thus the prediction accuracy and responsiveness are inferior. There is a problem in that the infrared light emitting and the light receiving unit are separately installed, and thus a transmitting and receiving circuit is configured to add a complicated circuit.

The present invention has been made to solve the above problems, the defogging system and control using a light emitting device that can remove the fog generated on the windshield of the vehicle by using the difference in the light quantity of the light emitting device and the light receiving device It is an object to provide a method.

It is another object of the present invention to transmit light of a light emitting device at a specific frequency and to calculate a quantity of light by receiving only a specific frequency from the light receiving device, and a defogging system and control method capable of accurate fog removal driving by minimizing errors. The purpose is to provide.

The present invention uses an optical quantity difference between the light emitting element and the light receiving element, uses a specific frequency in the transmission and reception of light in order to minimize the error rate, includes an optical filter for removing disturbance elements, and for the transmission and reception of light In order to minimize the loss, a support member having a high light transmittance is used, and the light condenser is installed so as to be totally reflected at an angle.

As described above, the present invention having the configuration as described above can minimize the increase in additional costs by using the optical sensor of the auto lighting system, and by collecting water vapor and frost with the light collecting part supporting member, it passes through and is reduced. By comparing the amount of light with the standard amount of light, it is possible to accurately detect the occurrence of water vapor and frost, and accordingly, the response speed can be increased by increasing the response speed by driving the air conditioning device. Effects such as removing obstructions and elements that reduce driver's concentration can be achieved.

In order to achieve the above object, the present invention provides a light emitting device for outputting light in the direction of the front glass of the vehicle; A first condenser concentrating light output from the light emitting element onto the windshield; A second light concentrating part through which the light of the first light converging part is totally reflected from the windshield; A light receiving element in which totally reflected light input to the second condenser is concentrated and input; A controller which compares the amount of light output from the light emitting element with the amount of light input to the light receiving element and outputs a control signal for removing water vapor and frost if a predetermined threshold value is exceeded; It includes.

The first condenser and the second condenser are provided at a predetermined distance from the front glass, and the condenser support member supports the light at the predetermined angle so that the light is input to the second condenser. It characterized in that it further comprises.

In addition, the light collecting part support member is characterized in that the through-hole is formed that can be collected steam and frost.

Here, the light collecting portion support member is characterized in that the light passes through, is formed of a material that does not reduce the amount of light.

The control unit may automatically control on / off each light in the vehicle based on the amount of light detected by the first and second optical sensors.

The first condenser and the second condenser may include an optical filter for removing disturbance of light; It characterized in that it further comprises.

Here, the threshold value is a reduced amount of light when water vapor and frost are generated, and the threshold value may be a preset value tested.

In addition, the light emitting device is characterized in that the intensity of the light is output according to the intensity of the light incident through the windshield.

In addition, the light emitting device outputs light at a specific frequency, the light receiving device is characterized in that to remove the disturbance element by receiving the light of the specific frequency.

And, a first step of outputting the light adjusted from the light emitting device according to the intensity of the light incident on the windshield of the vehicle; A second step of totally reflecting the light from the front glass and outputting the light to the second light collecting part, the first light collecting part receiving the light output from the light emitting device; A third step of receiving light concentrated at the second light collecting unit from a light receiving element; And a fourth step of comparing the light amount of the light emitting device with the light amount of the light receiving device by a controller and outputting a control signal for removing water vapor and frost when a predetermined threshold value is exceeded.

Hereinafter, with reference to the accompanying drawings, an embodiment according to the present invention will be described in detail.

1 is a block diagram schematically illustrating a defogging system using a light emitting device according to the present invention. As shown in the drawings, the defogging system 1 using the light emitting device according to the present invention includes a light emitting device 10, a first light collecting unit 20, a light collecting unit supporting member 30, and a second light collecting unit ( 40, a light receiving element 50, and a control unit 60.

The windshield glass of the vehicle is provided to perform a role of shielding the wind blowing to the driver and the occupant as the vehicle's speed increases. Frost and water vapor (Fog) may occur, thereby obstructing the driver's field of view.

Therefore, the defogging system 1 using the light emitting device according to the present invention is provided to remove frost and water vapor, which outputs light toward the windshield through the light emitting device 10, If the difference between the light quantity between the light emitting element 10 and the light receiving element 50 is greater than or equal to a predetermined value by receiving the light from the light receiving element 50, it is determined that frost and water vapor have occurred. ) And an air conditioning device to output a control signal to remove frost and water vapor.

In addition, the light emitting device 10 is made of a light emitting device, the difference between the light output from the light emitting device 10 and the light reaching the light receiving device 50 to determine whether the occurrence of steam and frost Since it is based on the concept of grasping, the light intensity emitted from the light emitting element 10 must be greater than the intensity of light incident into the vehicle to obtain a difference in the light received by the light receiving element 50.

Therefore, the intensity of the light emitted from the light emitting device 10 is preferably adjusted according to the light incident into the vehicle, which is controlled by the control unit 60, the light emitting device 10 is a device for controlling the amount of light It is preferred to be provided.

Alternatively, the light output from the light emitting device 10 is contained in a specific frequency so that the light quantity difference can be calculated irrespective of the intensity of the light incident from the inside of the vehicle. The device 50 should also include a filtering function to receive only light contained in a specific frequency.

The first condenser 20 is preferably provided with an optical system that focuses the light generated by the light emitting device 10 to be totally reflected to the windshield of the vehicle. It is preferable that it consists of a light condensing member which concentrates.

In addition, the first light concentrator 20 may further include a filtering element in order to remove disturbance of light. The first light filter 21 may be disposed between the first light concentrator 20 and the front glass. It is also preferable to further include.

In addition, the second light concentrator 40 is preferably provided with an optical system for focusing the light totally reflected from the windshield to be input to the light receiving element 50. For example, it concentrates light such as a lens. It is preferable to consist of the light condensing member which can be made.

In addition, the second light collecting part 40 may further include a filtering element in order to remove disturbance of light, and a second optical filter between the second light collecting part 40 and the light receiving element 50 may be used. It is preferable to further include 41).

In addition, the light collecting part support member 30 is formed in a shape capable of collecting frost and water vapor, and is attached to the inside of the windshield of the vehicle to pass frost and water vapor from the light receiving element 50 as frost and water vapor are generated. To measure the reduced amount of light.

In addition, the light collecting part support member 30 may be formed by deforming a housing or a case of the defogging system 1 for a vehicle. The defogging system 1 using a light emitting element provided inside the windshield of the vehicle may be used. A through hole is formed in the housing or case provided to surround the frost and water vapor.

In addition, the light collecting part supporting members 30 are provided to support the first and second light collecting parts 20 and 40, respectively, and are totally reflected on the windshield of the vehicle to pass through without decreasing the amount of light. And to support at an angle that can be incident at 50.

In addition, the light collecting part support member 30 is preferably formed of a material capable of minimizing the reduction of the intensity of light output from the light emitting device 10, and has a through hole capable of collecting frost and water vapor. do.

In addition, the light receiving element 50 may be provided as an element capable of detecting light such as a photo diode so as to sense the light concentrated in the second light collecting unit 40. It is preferable to be installed in a direction capable of sensing the light output from the light collecting portion 40.

The controller 60 may include a printed circuit board (PCB) to which the light emitting device 10 and the light receiving device 50 are attached. A filter / amplifier 61 is provided to filter and amplify the signal, and the signal passing through the comparator 63 obtains a light quantity difference in the comparator 63, and outputs a signal for removing frost and water vapor according to the light quantity difference. can do.

That is, when frost and water vapor are generated, the amount of light entering the light receiving device 50 by collecting frost and water vapor in the light collecting part support member 30 will be reduced, and thus the light output from the light emitting device 10 will be reduced. A light quantity difference with light will be generated.

Therefore, a light emitting device 10 which provides a reference value of light incident into the vehicle and a light collecting part supporting member 30 capable of collecting frost and water vapor are further provided to pass through the light collecting part supporting member 30. By using the light quantity difference of the light receiving element 50 that senses one light, it is possible to determine whether frost and water vapor are generated.

Accordingly, the controller 60 outputs a signal indicating that frost and water vapor has occurred to the FATC, and the FATC outputs a control signal to the air conditioner to remove frost and water vapor such as a defrost mode. It can output frost and steam automatically without user's operation.

Here, the light quantity difference between the light emitting element 10 and the light receiving element 50 is preferably set by a test a plurality of times, which is to be considered when designing the comparator 63 of the control unit 60, the comparator 63 Even without using the present invention, a storage device such as a memory and a CPU such as a microcontroller may be provided so that a plurality of inputs may be input so that the light quantity difference can be flexibly applied according to a variable according to a number of situations.

On the other hand, the light receiving element 50 may be used in conjunction with the Auto Lighting System (Auto Lighting System), for example, when the light incident to the light emitting element 50 is enough to drive the headlights and fog lights It is preferable to drive automatically and use it in conjunction with the light to be driven in addition to the light.

2 is a view schematically showing a shape and an operation process in which a defogging system using a light emitting device according to the present invention is mounted. As shown in the figure, in the defogging system 1 using the light emitting device according to the present invention, a light collecting part support member 30 is attached to the inside of the windshield.

The first condenser 20 and the second condenser 40 are formed at a predetermined angle by the condenser support member 30, and the predetermined angle is an angle at which light can be totally reflected from the windshield. In addition, an angle for minimizing the loss of light is formed, and in addition to this, it is an angle that can receive and concentrate light from the light emitting device 10, and an angle that can concentrate totally reflected light to the light receiving device 50.

In addition, the light collecting part support member 30 has a through hole through which fog, such as steam and frost, can be input to both side surfaces, and the light collecting part support member 30 is a defogging system using a light emitting device ( Since it is preferable to form the case and the housing of 1), through-holes are formed on both sides of the case and the housing so that fog, such as steam and frost, can be input and collected.

Then, the control unit for outputting a signal to the FATC to perform the same control as the Defrost Mode by comparing the difference between the first light amount emitted from the light emitting element 10 and the second light amount detected by the light receiving element 50 ( 60 is preferably provided as a PCB (Printed Circuit Board), it is preferable that the light emitting device 10 and the light receiving device 50 is attached to the PCB at a predetermined distance apart.

This is because the light emitted from the light emitting device 10 may affect the light receiving device 50 and may act as a variable that adds an error to the detected value.

In addition, the FATC connected to the PCB removes frost and water vapor by driving an air conditioning apparatus according to a control signal generated when the absolute value of the difference between the first light quantity and the second light quantity is tested and exceeds a preset threshold value. Do it.

On the other hand, the light receiving element 50 can detect the light input to the interior of the vehicle, by using this in conjunction with the Auto Lighting System (Auto Lighting System) in accordance with the light incident into the vehicle without the user's operation inside the vehicle and It can be used to drive an external light system.

3 is a diagram illustrating an embodiment of a defogging system using a light emitting device according to the present invention. As shown in the figure, the defogging system 1 using the light emitting element according to the present invention further includes a first optical filter 21 and a second optical filter 41.

In this case, the second light collecting part 40 may further include a filtering element in order to remove disturbance of light. The second light filter 41 may be disposed between the second light collecting part 40 and the light receiving element 50. It is preferable to further include).

In addition, the first optical filter 21 and the second optical filter 41 may be provided at a point where disturbance elements may occur. In the embodiment of the present invention, the first optical filter 21 may include a first collector. It is provided between the light portion 20 and the windshield, and the second optical filter 41 is provided between the windshield and the second light collecting portion 40, wherein each of the first optical filter 21 and the second optical filter 41 Is preferably attached to the first condenser 20 and the second condenser 40.

That is, the first optical filter 21 and the second optical filter 41 are provided inside the light collecting part supporting member 30.

4 is a diagram illustrating an embodiment of a defogging system using a light emitting device according to the present invention. As shown in the figure, the defogging system 1 using the light emitting device according to the present invention is configured to adjust the light intensity of the light emitting device 10 according to the external light.

Here, when calculating the difference between the light element incident on the vehicle and the light element generated by the light emitting element 10 is mixed to calculate the amount of light detected by the light receiving element 10 as a variable that can generate an error Although it may act, it is not possible to completely remove the light incident to the vehicle, thereby controlling the intensity of the light of the light emitting device 10 to distinguish it from the light incident to the vehicle, accordingly the light receiving element 50 to the vehicle It is made to exclude the incident light.

Therefore, when sensing light incident to the vehicle from the outside, the light emitted from the light emitting device 10 can be input, so that the light input to the light emitting device 10 and the outside during the predetermined period (T ₁ ) The amount of light mixed with the input light is sensed, and only the light incident to the vehicle is considered during the predetermined period T ₂ .

In addition, it is preferable to change the amount of light of the light emitting device 10 in consideration of the light intensity of the light emitting device 10 during the T ₁ period and the light intensity incident from the outside during the T2 period.

For example, the light generated by the light emitting device 10 may be distinguished from the light receiving device 50 by making the luminance, the saturation, etc. of the light higher than the incident light.

5 is a diagram illustrating an embodiment of a defogging system using a light emitting device according to the present invention. As shown in the figure, the defogging system 1 using the light emitting element according to the present invention is errored by the disturbance element of the light while the light output from the light emitting element 10 reaches the light receiving element 50. In order to remove the variable to be generated, use a specific frequency.

Here, the light emitting device 10 may send light at a specific frequency, and the light receiving device 50 may filter to receive only a specific frequency to remove an error such as a decrease due to light scattering.

6 is a flowchart illustrating a method for controlling a defogging system using a light emitting device according to the present invention. As shown in the figure, the defogging system using the light emitting device according to the present invention starts as follows.

First, light is output from the light emitting device to the first condenser, and the amount of light output from the light emitting device is called a first light amount (S10).

In addition, the first light concentrator may totally reflect the light received from the light emitting device on the windshield of the vehicle, which is transmitted to the second light concentrator (S20).

In addition, the light input to the second condenser is concentrated toward the light receiving element, and the intensity of light received from the light receiving element is referred to as a second light amount (S30).

In addition, the control unit obtains an absolute value of the difference between the first light amount and the second light amount, and compares the measured value with a preset set value (S40).

Herein, when light decreases, that is, when the light quantity difference is larger than the set value, it is determined that a decrease occurs in the passage of light due to frost and water vapor, and a signal for the generation of frost and water vapor is transmitted to the FATC.

When the FATC outputs a driving signal for removing frost and water vapor such as a defrost mode to the air conditioning apparatus (S50), the air conditioning apparatus removes water vapor and frost in the defrost mode (S60). .

In the above described exemplary embodiments of the present invention by way of example, the scope of the present invention is not limited to this specific embodiment, and those skilled in the art within the scope described in the claims of the present invention Changes may be made as appropriate.

1 is a block diagram schematically showing a defogging system using a light emitting device according to the present invention.

2 is a view schematically showing a shape and an operation process in which a defogging system using a light emitting device according to the present invention is mounted.

3 is a view showing an embodiment of a defogging system using a light emitting device according to the present invention.

4 illustrates an embodiment of a defogging system using a light emitting device according to the present invention.

5 illustrates an embodiment of a defogging system using a light emitting device according to the present invention.

6 is a flowchart illustrating a method for controlling a defogging system using a light emitting device according to the present invention.

      <Brief description of reference numerals for the main parts of the drawings>

1: Defogging system using light emitting device 10: Light emitting device

20: first condenser 30: condenser support member

40: second light collecting part 50: light receiving element

60: control unit 61: filter / amplifier

63: comparator

Claims (11)

A light emitting device configured to output light toward the windshield of the vehicle; A first condenser concentrating light output from the light emitting element onto the windshield; A second light concentrating part through which the light of the first light converging part is totally reflected from the windshield; A light receiving element in which totally reflected light input to the second condenser is concentrated and input; A controller which compares the amount of light output from the light emitting element with the amount of light input to the light receiving element and outputs a control signal for removing water vapor and frost if a predetermined threshold value is exceeded; Defogging system using a light emitting device comprising a. The method according to claim 1, A first concentrator and a second concentrator are spaced apart from the front glass by a predetermined distance, and a concentrator support member supports the light at the predetermined angle so that the light of the first concentrator is input to the second condenser; Defogging system using a light emitting device, characterized in that it further comprises. The method according to claim 2, The condenser support member is a defogging system using a light emitting device, characterized in that the through-hole is formed to collect water vapor and frost. The method according to claim 3, The condenser support member is a defogging system using a light emitting device, characterized in that the light passes through, the light amount is formed of a material is not reduced. The method according to claim 1, The control unit is a defogging system using a light emitting device, characterized in that for automatically controlling the on / off each light in the vehicle based on the amount of light detected by the first and second optical sensors. The method according to claim 1, An optical filter for removing light disturbances of the first and second light collecting parts; Defogging system using a light emitting device, characterized in that it further comprises. The method according to claim 1, The threshold value is a reduced amount of light when water vapor and frost is generated, the defogging system using a light emitting device, characterized in that the tested value. The method according to claim 1, The light emitting device is a defogging system using a light emitting device, characterized in that the intensity of the light is output according to the intensity of the light incident through the windshield. The method according to claim 1, The light emitting device outputs light at a specific frequency, and the light receiving device receives light of the specific frequency to remove the disturbance element, defogging system using a light emitting device. A first step of outputting light, which is adjusted according to the intensity of light incident on the windshield of the vehicle, from the light emitting device; A second step of totally reflecting the light from the front glass and outputting the light to the second light collecting part, the first light collecting part receiving the light output from the light emitting device; A third step of receiving light concentrated at the second light collecting unit from a light receiving element; A fourth step of comparing the light amount of the light emitting element with the light amount of the light receiving element by a controller and outputting a control signal for removing water vapor and frost if a predetermined threshold value is exceeded; Defogging system control method using a light emitting device comprising a. The method according to claim 10, The third step is The amount of light detected by the light receiving element is transmitted to the auto lighting system to automatically control the on / off of each light on the basis of the light amount in the auto lighting system for controlling each light provided in the vehicle ; Defogging system control method characterized in that it further comprises.

Images