JP2022025042A - Anti-fogging control system for vehicular lamp and anti-fogging control method for vehicular lamp - Google Patents

Abstract

To provide an anti-fogging control system for a vehicular lamp.SOLUTION: Dry gas is injected into an internal space of a closed structure where a lamp housing 1 and a lamp lens have an internal space; after suctioning moist gas in a lamp chamber with a gas suction device 3, the dry gas is injected into the lamp chamber with a gas injection device 4 to always maintain the gas in the lamp chamber at a constant relative humidity; so that it is possible to prevent fogging of a vehicular lamp due to change in the humidity of the gas in the lamp room due to external climate change.SELECTED DRAWING: Figure 1

Description

The present invention relates to the technical field of a vehicle lamp, and particularly to a vehicle lamp anti-fog control system and a vehicle lamp anti-fog control method.

In vehicle lighting equipment, a lamp lens and a lamp housing are usually connected to form an internal space, an optical system is attached to the internal space, and a lighting function and a signal are connected / disconnected from a power source via a control circuit. The function is realized, and it plays a role of lighting and alerting the user. In order to prevent the gas in the internal space from expanding due to the heat generated by lighting the lamp for the vehicle, the lamp housing is provided with a ventilation hole for discharging the gas to prevent the lamp from bursting due to the expansion of the lamp. However, by providing ventilation holes, the internal space is communicated with the outside air, and changes in the humidity of the surrounding environment may affect the relative humidity of the internal space. If the humidity is too high, the temperature of the internal space will be uneven, and when the temperature reaches the dew point temperature, the vehicle lighting will become cloudy, which will seriously affect the lighting and visual effects of the vehicle lighting. Gives and poses a danger to driving at night.

As a conventional solution, one is to apply an anti-fog paint to the inside of the lamp lens to reduce the surface tension of the water droplets adhering to the inside of the lamp lens, so that the water droplets diffuse to form a water film. And make the water droplets invisible from the outside of the lamp lens. However, when rain or fog occurs and the relative humidity exceeds 60%, water dripping occurs, that is, water droplets on the lamp lens flow downward one after another, which seriously affects the lighting and appearance of vehicle lighting equipment. May be given. The other is that by arranging the desiccant in the internal space of the vehicle lighting equipment, the moisture in the vehicle lighting equipment is absorbed, the humidity of the internal space is lowered, the dew point temperature is lowered, and the formation of water droplets is suppressed. Will be done. However, the water absorption capacity of the desiccant is limited, and when the desiccant becomes saturated with water absorption, the effect is completely lost and the vehicle lamp may become cloudy again.

In view of the above, the present invention provides an anti-fog control system for vehicle lamps and an anti-fog control method for vehicle lamps in order to eliminate the drawbacks of the prior art.

The present invention is achieved by the following technical means.
The antifogging control system for vehicle lamps according to the present invention includes a lamp housing, a lamp lens, a gas suction device, and a gas injection device, and the lamp housing and the lamp lens are connected to form a sealed lamp chamber. Dry gas is injected into the lamp chamber, and the lamp housing is provided with a gas suction hole and a gas injection hole that communicate with each other, the gas suction hole is connected to the gas suction device, and the gas injection hole is formed. Connected to a gas injection device.

Further, the lamp housing is provided with a barometric pressure balancing port, and the barometric pressure balancing means is hermetically provided at the barometric pressure balancing port, and the barometric pressure balancing means includes an elastic structure that shields the lamp chamber from the outside air.

Further, the barometric pressure balancing means further comprises a first cover that covers one side of the elastic structure, the first cover being located outside the lamp chamber and provided with a first vent that communicates with the outside air. Be done.

Further, the barometric pressure balancing means further comprises a second cover that covers the other side of the elastic structure, wherein the second cover is located inside the lamp chamber and has a second vent that communicates with the lamp chamber. It will be provided.

Further, the gas suction device includes a gas suction pump and a gas suction pipe, the gas suction pump communicates with the gas suction hole via the gas suction pipe, and the gas suction pipe is provided with a first control valve.

Further, the gas injection device includes a gas storage tank and a gas injection pipe, the gas storage tank is connected to the gas injection hole via the gas injection pipe, and the gas injection pipe is provided with a second control valve.

Further, the gas injection device further includes an air compressor and an air dryer, and the air compressor is connected to the air dryer and the gas storage tank, respectively.

The present invention further provides an anti-fog control method for vehicle lamps.
A step to collect the relative humidity of the first gas injected into the lamp chamber,
When the relative humidity of the first gas is equal to or higher than the first set value, the step of sucking the first gas in the lamp chamber and the step of sucking the first gas
The step of drying the second gas until the relative humidity reaches the second set value,
Including a step of injecting a dry second gas into the lamp chamber until the relative humidity of the second gas in the lamp chamber is less than the first set value.
When the first gas is sucked and injected, the components of the sucked first gas and the injected second gas may be the same or different.

Further included is a step of providing a barometric pressure balancing port in the light chamber and attaching an adaptively deformable elastic structure to the barometric pressure balancing port so as to block the first gas or the second gas in the lighting chamber from the outside air.

Compared with the prior art, the beneficial effects of the technical means of the present invention are as follows.
In the antifogging control system for vehicle lighting and the antifogging control method for vehicle lighting according to the present invention, the lamp housing and the lamp lens are provided as a closed structure having an internal space, and dry gas is injected into the internal space. After sucking the moist gas in the lamp chamber with the gas suction device, the dry gas is injected into the lamp chamber with the gas injection device, so that the gas in the lamp chamber is always maintained at a constant relative humidity, which is convenient and quick. Prevents clouding of vehicle lamps due to changes in the humidity of gas in the lamp chamber due to external climate changes, and ensures the lighting and visual effects of vehicle lamps. Since the flow rates of the injected gas and the sucked gas match, the balance between the injection of gas and the pressure after suction is ensured. When the lamp housing is provided with an atmospheric pressure balancing means and is in a high temperature state due to the lighting of the vehicle lighting equipment or the influence of the environmental temperature, or when the vehicle lighting equipment is turned off or the temperature is low due to the influence of the environmental temperature. As the pressure rises and falls, the elastic structure can be deformed so that the space in the lamp chamber becomes larger or smaller, and the pressure in the lamp chamber changes slightly around 1 atm. The air pressure in the lighting room is maintained in a stable state, and the explosion of vehicle lighting equipment due to pressure changes is prevented.

In order to more clearly explain the technical means in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and the drawings in the following description are some embodiments of the present invention. It is clear that those skilled in the art can obtain other drawings based on these drawings without any creative labor.

It is a figure which shows the operation principle of the anti-fog control system of the vehicle lighting equipment which concerns on embodiment of this invention. It is a perspective view which shows that the lamp housing and the lamp lens which concerns on embodiment of this invention are connected. It is sectional drawing when the lamp housing and the lamp lens which concerns on embodiment of this invention are in a normal temperature state. It is a partial cross-sectional view when the lighting equipment for a vehicle of FIG. 3 is in a high temperature state. It is a partial cross-sectional view when the light fixture for a vehicle of FIG. 3 is in a low temperature state.

In order for those skilled in the art to better understand the invention and more clearly limit the scope of the invention for which protection is sought, the invention will be described in detail below with reference to some specific embodiments of the invention. It should be noted that the following are merely some specific embodiments based on the idea of the present invention, which are only examples of a part of the present invention, and a specific and direct explanation of the related structure is an understanding of the present invention. The specific features of each do not necessarily and directly limit the scope of the present invention. Any of the usual selections and replacements made by one of ordinary skill in the art based on the ideas of the present invention should be included within the scope of the present invention for which protection is sought.

Hereinafter, the present invention will be described in detail with reference to the drawings with reference to specific examples.

As shown in FIGS. 1 to 3, the antifogging control system for vehicle lamps according to the present invention includes a lamp housing 1, a lamp lens 2, a gas suction device 3 and a gas injection device 4, and includes a lamp housing 1 and a lamp lens. 2 is connected to form a closed lamp chamber 1a, and dry gas is injected into the lamp chamber 1a. The lamp housing 1 has a gas suction hole 1b and a gas injection hole 1c communicating with the lamp chamber 1a, respectively. The gas suction hole 1b is connected to the gas suction device 3, and the gas injection hole 1c is connected to the gas injection device 4. The lamp housing 1 and the lamp lens 2 are engaged, glued or welded via a seal ring.

The gas suction device 3 and the gas injection device 4 operate sequentially, and in order to prevent the pressure balance in the lamp chamber 1a from being disturbed due to the suction of gas or the excessive injection flow rate, the gas suction or injection is performed a plurality of times in a small amount. Can be done. After suction and injection, the gas suction hole 1b and gas injection hole 1c are closed with a seal plug to block the light chamber 1a from the outside air to prevent gas leakage in the light chamber 1a, and the external climate changes. Further, even in the case of rapid cooling and rapid heating, the gas component in the lamp chamber 1a can be kept constant.

Specifically, a humidity sensor for detecting the humidity of the gas in the lamp chamber 1a is provided in the lamp chamber 1a, and the gas is sucked so that the humidity of the gas in the lamp chamber 1a is always in an appropriate state. And injection can be controlled in a timely manner.

Specifically, a pressure sensor for detecting the atmospheric pressure of the injected gas or the sucked gas is attached to the gas suction device 3, the gas injection device 4, or the light chamber 1a, and the lighting equipment for vehicles due to the excessive pressure. Can be prevented from bursting.

Preferably, the gas suction device 3 includes a gas suction pump 31 and a gas suction pipe 32, and the gas suction pump 31 communicates with the gas suction hole 1b via the gas suction pipe 32, and the gas suction pipe 32 has a first control. A valve 33 is provided.

Specifically, a gas suction joint 7 communicating with the gas suction pipe 32 is attached to the gas suction hole 1b.

Preferably, the barometric pressure sensor is mounted in the gas suction tube 32 or the gas suction joint 7 or the lamp chamber 1a.

Preferably, the gas injection device 4 includes a gas storage tank 41 and a gas injection pipe 42, and the gas storage tank 41 is connected to the gas injection hole 1c via the gas injection pipe 42, and the gas injection pipe 42 has a second control. A valve 43 is provided.

Preferably, the gas injection device 4 further includes an air compressor 44 and an air dryer 45, and the air compressor 44 is connected to the air dryer 45 and the gas storage tank 41, respectively.

Further, a gas injection joint 8 communicating with the gas injection pipe 42 is attached to the gas injection hole 1c.

The barometric pressure sensor is mounted in the gas injection tube 42 or the gas injection joint 8 or the light chamber 1a.

Preferably, the lamp housing 1 is provided with the barometric pressure balancing port 1d, the barometric pressure balancing means 5 is hermetically provided at the barometric pressure balancing port 1d, and the barometric pressure balancing means 5 includes an elastic structure 51 that shields the light chamber 1a from the outside air. .. The contact between the outside air and the gas in the lamp chamber 1a is prevented, the lamp chamber 1a is provided with an appropriate expansion and contraction space, and the normal operation of the vehicle lamp is ensured under normal pressure.

Specifically, the elastic structure 51 is a silicon diaphragm, a silicon bag, or a silicon cap.

Preferably, the barometric pressure balancing means 5 is attached to the lamp housing 1 via the seal ring 6 and more preferably located at the bottom of the lamp housing 1.

Specifically, the atmospheric pressure balancing means 5 further includes a first cover 52 that covers one side of the elastic structure 51, and the first cover 52 is located outside the light chamber 1a and communicates with the outside air. The ventilation hole 52a of 1 is provided. When the air pressure in the lamp chamber 1a increases due to an increase in temperature, the expanded state of the elastic structure 51 is limited to prevent excessive expansion.

Preferably, the first cover 52 is engaged with the lamp housing 1.

The outer wall of the lamp housing 1 is provided with a first support ring 9 for supporting the first cover 52, and the open end of the first cover 52 is provided with a position restricting ring 52b. A plurality of locking blocks 52c provided at relative intervals to the position restricting ring 52b are provided on the outer wall of the cover 52, and the first support ring 9 is fitted to the first cover 52 to regulate the position. The ring 52b is abutted against the seal ring 6 on the inner wall of the lamp housing 1, and the side wall of the locking block 52c is abutted and locked to the outer end of the first support ring 9.

Further, a plurality of first ventilation holes 52a are arranged laterally in the first cover 52 at intervals, and the air pressure in the first cover 52 is maintained in a normal pressure state.

Specifically, the barometric pressure balancing means 5 further includes a second cover 53 that covers the other side of the elastic structure 51, which is located inside the light chamber 1a and communicates with the light chamber 1a. A second ventilation hole 53a is provided. When the air pressure in the lamp chamber 1a becomes small due to the decrease in temperature, the contraction state of the elastic structure 51 is limited to prevent excessive contraction.

As shown in FIGS. 4 and 5, preferably, the first cover 52 and the second cover 53 are integrally crimped via the elastic structure 51, and the first cover 52 and the second cover 53 are attached to each other. It is divided into two spaces that do not communicate with each other. When the temperature inside the lamp chamber a rises, the elastic structure 51 expands inside the first cover 52, the air pressure inside the lamp chamber 1a rises to reach an equilibrium state, and the temperature inside the lamp chamber 1a falls. Then, the elastic structure 51 contracts inside the second cover 53, the air pressure in the lamp chamber 1a decreases, and the equilibrium state is reached. Therefore, the air pressure in the lamp chamber 1a is maintained at a small change value under normal pressure, and the pressure in the lamp chamber 1a rises or a negative pressure is generated due to the temperature change, and the vehicle lamp bursts and is normal. Prevents impact on use.

Further, a plurality of second ventilation holes 53a are arranged in the second cover 53 at intervals in the vertical direction so as to match the air pressure in the light chamber 1a with the second cover 53.

During use, the gas suction pump 31 is used to suck the moist gas in the lamp chamber 1a through the gas suction pipe 32, and the pressure sensor detects that the vacuum pressure in the lamp chamber 1a has reached the lower limit value of -5000 KPa. Then, the first control valve 33 is closed and the suction of gas is stopped. Dry air having a relative humidity of less than 10% is injected into the light chamber 1a via the air compressor 44, the gas storage tank 41 and the gas injection pipe 42 using the air dryer 45, and the vacuum pressure in the light chamber 1a is the upper limit. When the barometric pressure sensor detects that the value has reached 3000 KPa, the second control valve 43 is closed and the gas injection is stopped. When the atmospheric pressure sensor detects that the atmospheric pressure has reached the upper limit value or the lower limit value, gas suction and injection can be repeated multiple times, and the humidity sensor indicates that the relative humidity of the air in the lamp chamber 1a is less than 20%. Is detected, gas suction and injection are stopped, the gas suction hole 1b and the gas injection hole 1c are closed with a seal plug, and the gas is fastened with a screw.

The present invention further provides an anti-fog control method for vehicle lamps.
A step of collecting the relative humidity of the first gas injected into the light chamber 1a,
When the relative humidity of the first gas is equal to or higher than the first set value, the step of sucking the first gas in the lamp chamber 1a and the step of sucking the first gas,
The step of drying the second gas until the relative humidity reaches the second set value,
Including a step of injecting a dry second gas into the light chamber 1a until the relative humidity of the second gas in the light chamber 1a is less than the first set value.
When the first gas is sucked and injected, the components of the sucked first gas and the injected second gas may be the same or different.

Specifically, both the gas injected into the lamp chamber 1a and the gas to be injected are dry air, which is obtained in comparison with the method of applying an anti-fog paint or arranging a desiccant to prevent fogging. Is easy and convenient, environmentally friendly, pollution-free and low cost.

As the temperature of the lighting fixtures for vehicles rises, the humidity of the gas in the light chamber 1a also rises, increasing the probability of fogging. When the relative humidity is 35% or more, the probability of fogging is 100%. be. Therefore, the method of preventing fogging of the vehicle lamp is to reduce the relative humidity in the vehicle lamp, and by maintaining the humidity of the gas in the lamp chamber 1a in an appropriate state, the vehicle lamp becomes cloudy. It is possible to almost eliminate the damage compensation caused by.

Preferably, the relative humidity of the injected dry gas is less than 10% and the relative humidity of the dry gas in the lamp chamber 1a is less than 20%, thus providing the vehicle lighting fixtures in the temperature range of -40 ° C to 80 ° C. No cloudiness when used inside, adapts to various climatic changes, is environmentally friendly, clean, reliable, has a long life and can be used until the expiration date of vehicle lighting ..

Preferably, the air pressure equilibrium port 1d is provided in the light chamber 1a, and an elastic structure 51 adaptably deformable is attached to the air pressure equilibrium port 1d so as to block the first gas or the second gas in the light chamber 1a from the outside air. Includes more steps. Since the flow rates of the injected gas and the sucked gas match, the balance of the pressure after the gas injection and suction is secured, and the elastic structure 51 can be brought into an equilibrium state.

When the temperature inside the lamp chamber 1a rises, the atmospheric pressure also rises, and the gas inside the lamp chamber 1a expands outward due to the deformation of the elastic structure 51, the pressure inside the lighting fixture for the vehicle decreases, and it balances with the atmospheric pressure of the outside air. , Slightly higher than atmospheric pressure. As a result of detection, when the temperature inside the vehicle lamp is 80 degrees, the pressure inside the lamp chamber 1a corresponds to 1.2 atm, and the lamp can perform normal and stable operation under this pressure, and is a gas. No fogging phenomenon occurs during suction or injection. When the temperature inside the lamp chamber 1a drops, the atmospheric pressure also drops, and the gas inside the lamp chamber 1a contracts inward due to the deformation of the elastic structure 51, and the pressure inside the lighting fixtures for vehicles is relaxed and balanced with the atmospheric pressure of the outside air. , Slightly smaller than atmospheric pressure. As a result of detection, when the temperature inside the vehicle lamp is -40 degrees, the pressure inside the lamp chamber 1a corresponds to 0.9 atm, and the lamp can perform normal and stable operation under this pressure. No fogging phenomenon occurs when sucking or injecting gas. The gas in the light chamber 1a changes at around 1 atm and the change value is within 0.2 atm even within the temperature range of -40 to 80 degrees, and the pressure in the light chamber 1a rises due to the temperature change. Prevents vehicle lighting from exploding and affecting normal use due to dripping or negative pressure.

The above is merely a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above-mentioned examples, and any technical means belonging to the idea of the present invention is included in the scope of protection of the present invention. .. Those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should be regarded as the scope of protection of the present invention.

1 Lamp housing 1a Light chamber 1b Gas suction hole 1c Gas injection hole 1d Gas pressure balancing port 2 Lamp lens 3 Gas suction device 31 Gas suction pump 32 Gas suction tube 33 First control valve 4 Gas injection device 41 Gas storage tank 42 Gas injection Pipe 43 Second control valve 44 Air compressor 45 Air dryer 5 Pressure balancing means 51 Elastic structure 52 First cover 52a First ventilation hole 52b Position regulation ring 52c Locking block 53 Second cover 53a Second Vent 6 Seal ring 7 Gas suction joint 8 Gas injection joint 9 First support ring

Claims (9)

A lamp housing (1), a lamp lens (2), a gas suction device (3), and a gas injection device (4) are provided, and the lamp housing (1) and the lamp lens (2) are connected and sealed. 1a) is formed, and dry gas is injected into the lamp chamber (1a), and the lamp housing (1) has a gas suction hole (1b) and a gas injection hole (1b) communicating with the lamp chamber (1a), respectively. 1c) is provided, the gas suction hole (1b) is connected to the gas suction device (3), and the gas injection hole (1c) is connected to the gas injection device (4). Anti-fog control system. The lamp housing (1) is provided with a barometric pressure balancing port (1d), the barometric pressure balancing means (5) is hermetically provided at the barometric pressure balancing port (1d), and the barometric pressure balancing means (5) is provided in a light chamber (5). The antifogging control system for a vehicle lamp according to claim 1, further comprising an elastic structure (51) that shields 1a) from the outside air. The barometric pressure balancing means (5) further comprises a first cover (52) covering one side of the elastic structure (51), the first cover (52) located outside the light chamber (1a). The antifogging control system for vehicle lighting equipment according to claim 2, wherein a first ventilation hole (52a) that communicates with the outside air is provided. The barometric pressure balancing means (5) further comprises a second cover (53) covering the other side of the elastic structure (51), the second cover (53) located inside the light chamber (1a). The antifogging control system for vehicle lighting equipment according to claim 2 or 3, wherein a second ventilation hole (53a) communicating with the lighting chamber (1a) is provided. The gas suction device (3) includes a gas suction pump (31) and a gas suction pipe (32), and the gas suction pump (31) communicates with the gas suction hole (1b) via the gas suction pipe (32). The antifogging control system for vehicle lighting equipment according to claim 2, wherein the gas suction pipe (32) is provided with a first control valve (33). The gas injection device (4) includes a gas storage tank (41) and a gas injection pipe (42), and the gas storage tank (41) is connected to a gas injection hole (1c) via a gas injection pipe (42). The antifogging control system for vehicle lighting equipment according to claim 2 or 5, wherein a second control valve (43) is provided in the gas injection pipe (42). The gas injection device (4) further includes an air compressor (44) and an air dryer (45), and the air compressor (44) is connected to the air dryer (45) and the gas storage tank (41), respectively. The anti-fog control system for vehicle lighting equipment according to claim 6, wherein the anti-fog control system is used. A step of collecting the relative humidity of the first gas injected into the light chamber (1a),
When the relative humidity of the first gas is equal to or higher than the first set value, the step of sucking the first gas in the lamp chamber (1a) and the step of sucking the first gas,
The step of drying the second gas until the relative humidity reaches the second set value,
Including a step of injecting a dry second gas into the light chamber (1a) until the relative humidity of the second gas in the light chamber (1a) is less than the first set value.
A method for controlling anti-fog of a vehicle lamp, wherein the components of the sucked first gas and the injected second gas may be the same or different when the first gas is sucked and injected. A barometric pressure balancing port (1d) is provided in the light chamber (1a), and the pressure balancing port (1d) can be adaptively transformed so as to block the first gas or the second gas in the light chamber (1a) from the outside air. The antifogging control method for a vehicle lamp according to claim 8, further comprising a step of attaching the elastic structure (51).

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