CN111885767A - Automobile headlamp temperature control method - Google Patents
Automobile headlamp temperature control method Download PDFInfo
- Publication number
- CN111885767A CN111885767A CN202010674961.6A CN202010674961A CN111885767A CN 111885767 A CN111885767 A CN 111885767A CN 202010674961 A CN202010674961 A CN 202010674961A CN 111885767 A CN111885767 A CN 111885767A
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- headlamp
- temperature
- less
- current
- brightness
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000007613 environmental effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000004399 eye closure Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
- H05B45/18—Controlling the intensity of the light using temperature feedback
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
The invention provides a temperature control method for an automobile headlamp, which comprises the following steps: A. the automobile headlamp is electrified, and the current value of the headlamp keeps i constant output; B. reading the ambient temperature T of the headlamp, when the temperature T is increased to a threshold value X, gradually reducing the current of the headlamp to a set value I within unit time S, and reducing the brightness of the headlamp, wherein I is less than I; C. reading the ambient temperature T of the headlamp, when the temperature is reduced to a safety value Y, gradually increasing the current of the headlamp to a set value i within unit time S, and increasing the brightness of the headlamp, wherein Y is less than X; D. the headlight ambient temperature T is read and step B, C is repeated. According to the method, the brightness of the automobile headlamp is slowly reduced or increased by slowly reducing or increasing the current of the automobile headlamp, so that a driver can slowly adapt to the change of the brightness when driving at night, the observation effect of the driver is prevented from being influenced by the sudden change of the light brightness, and the safety of driving at night is improved.
Description
Technical Field
The invention belongs to the field of vehicle illuminating lamps, and particularly relates to a temperature control method for an automobile headlamp.
Background
With the continuous development of the automobile industry, more and more automobiles adopt LED lamps as headlights of the automobiles, the headlights of the automobiles are light assemblies with the highest brightness on the automobiles, and the power of the headlights is also the highest in reason.
The high-power light assembly also brings higher heat productivity, the heat produced by the traditional xenon or halogen headlamp is far higher than that of the LED headlamp, but the brightness output by the bulb cannot change due to temperature, and the thermal design is mainly the temperature equalization design in the shell. The light output of the LED influences the stability of the PN junction temperature of the LED due to self heat or high temperature from an engine compartment, so that the temperature of the LED during working needs to be detected during driving, the temperature sensor detects the temperature on the LED chip, and when the temperature is too high, the output current is reduced, and the temperature of the LED during working is reduced.
The current reduction mode in the prior art is as follows: when the temperature of the headlight rises and exceeds the threshold value, the current value is instantly reduced to reduce the load of the headlight, and when the temperature of the headlight falls and exceeds the threshold value, the current value is instantly increased to improve the brightness of the headlight. The cooling strategy of the LED causes the driving current to suddenly drop, and the luminous flux is possibly in danger of suddenly dropping. Because people's eye needs adaptation time to dim light state and highlight state, the sudden decline of the luminance of headlight can lead to people's eye can't adapt to see the road conditions in the place ahead clearly, and the sudden rise of the luminance of headlight also can amazing people's eye and cause the conditioned reflex of closed eye, has the potential safety hazard of driving at night. The current change is shown in fig. 1. This current reduction leads to sudden changes in the brightness of the headlight,
disclosure of Invention
The invention aims to provide a temperature control method for an automobile headlamp, which is used for gradually reducing or increasing the brightness of an automobile lamp while controlling the temperature of the automobile lamp.
In order to achieve the purpose, the technical scheme of the invention is as follows: a temperature control method for an automobile headlamp comprises the following steps: A. the automobile headlamp is electrified, and the current value of the headlamp keeps i constant output; B. reading the ambient temperature T of the headlamp, when the temperature T is increased to a threshold value X, gradually reducing the current of the headlamp to a set value I within unit time S, and reducing the brightness of the headlamp, wherein I is less than I; C. reading the ambient temperature T of the headlamp, when the temperature is reduced to a safety value Y, gradually increasing the current of the headlamp to a set value i within unit time S, and increasing the brightness of the headlamp, wherein Y is less than X; D. the headlight ambient temperature T is read and step B, C is repeated.
According to the method, the brightness of the automobile headlamp is slowly reduced or increased by slowly reducing or increasing the current of the automobile headlamp, so that a driver can slowly adapt to the change of the brightness when driving at night, the observation effect of the driver is prevented from being influenced by the sudden change of the light brightness, and the safety of driving at night is improved.
Drawings
FIG. 1 is a graph of current change in a headlamp in the prior art;
FIG. 2 is a diagram of the current change of the headlight according to the invention;
FIG. 3 is a flow chart of the present invention;
fig. 4 is a circuit diagram of the headlamp control circuit of the present invention.
Detailed Description
A temperature control method for an automobile headlamp comprises the following steps: A. the automobile headlamp is electrified, and the current value of the headlamp keeps i constant output; B. reading the ambient temperature T of the headlamp, when the temperature T is increased to a threshold value X, gradually reducing the current of the headlamp to a set value I within unit time S, and reducing the brightness of the headlamp, wherein I is less than I; C. reading the ambient temperature T of the headlamp, when the temperature is reduced to a safety value Y, gradually increasing the current of the headlamp to a set value i within unit time S, and increasing the brightness of the headlamp, wherein Y is less than X; D. the headlight ambient temperature T is read and step B, C is repeated.
According to the method, after the temperature of the headlamp is increased to the threshold value after the headlamp operates for a period of time, the current is reduced slowly, the reduction of the temperature and the light emission amount is accompanied by the reduction of the current, the change process is within the unit time S, and the unit time S is long, so that the human eyes can adapt to the reduction of the brightness of the headlamp within a long time, when the temperature is reduced to a certain degree, the current is increased slowly, the brightness is increased slowly, and the condition reflection that the suddenly increased brightness stimulates the human eyes to cause eye closure is avoided. Therefore, the driver can slowly adapt to the change of brightness when driving at night, the observation effect of the driver is prevented from being influenced by the sudden change of the light brightness, and the safety of driving at night is improved.
In step B, C, the headlight current is varied uniformly per unit time S. The uniform change in current results in a uniform change in brightness, which is more conducive to human eye adaptation to headlamp brightness.
The current set value I is correspondingly provided with I1, I2 and I3 … … In according to different environmental temperatures T. The temperature is possibly reduced due to slight reduction of the current, the current of the headlamp is prevented from directly reducing to the lowest point through the current values set in a segmented mode, so that the headlamp can keep high brightness when driving at night, the trend of reduction of the brightness of the headlamp is further delayed through the segmented design of the current values, and the headlamp is convenient for human eyes to adapt.
When T is less than X, the headlight current is constant I, when X is less than T and less than X1, I1 and less than I, when X1 and T are less than X2, I2 and less than I1, when T is more than Xn, the headlight current is constant In, X is less than X1 and less than X2 and less than Xn, and In is less than I2 and less than I1 and less than I. Different temperatures in the scheme correspond to different currents, and the lowest current value is set, so that the continuous brightness reduction caused by the continuous temperature rise is avoided.
The unit time S is 1 to 2 seconds, I is 700Ma, I1 is 650Ma, I2 is 590Ma, In is 550Ma, X is 60 ℃, X1 is 65 ℃, X2 is 70 ℃, X2 is 75 ℃, and Y is 40 ℃.
When the current of the headlamp is reduced to a minimum value In, the brightness of the headlamp is greater than or equal to the minimum brightness required by driving safety at night. Thus, the potential safety hazard of driving at night caused by excessively low brightness of the headlamp is avoided.
The control units for the slow current drop are correspondingly arranged in a plurality according to different temperature sections. Therefore, the control and constancy of the current in each temperature section are facilitated, and the stability of the brightness of the headlamp is kept.
And the control unit for slowly reducing the current is connected with the circuit through a temperature relay. When the corresponding temperature is reached, the corresponding temperature relay 1 and the other temperature relays 0 are set, so that the control unit can independently control the current change of the temperature section.
The temperature measuring unit for reading the ambient temperature of the headlamp in real time is arranged near the automobile headlamp light-emitting unit. The temperature directly influences the stability of the PN junction of the LED headlamp, and the working condition of the LED headlamp of the control unit can be obtained more accurately by measuring the temperature.
Claims (9)
1. A temperature control method for an automobile headlamp comprises the following steps:
A. the automobile headlamp is electrified, and the current value of the headlamp keeps i constant output;
B. reading the ambient temperature T of the headlamp, when the temperature T is increased to a threshold value X, gradually reducing the current of the headlamp to a set value I within unit time S, and reducing the brightness of the headlamp, wherein I is less than I;
C. reading the ambient temperature T of the headlamp, when the temperature is reduced to a safety value Y, gradually increasing the current of the headlamp to a set value i within unit time S, and increasing the brightness of the headlamp, wherein Y is less than X;
D. the headlight ambient temperature T is read and step B, C is repeated.
2. The method for controlling the temperature of an automobile headlamp according to claim 1, characterized in that: in step B, C, the headlight current is varied uniformly per unit time S.
3. The method for controlling the temperature of an automobile headlamp according to claim 1, characterized in that: the current set value I is correspondingly provided with I1, I2 and I3 … … In according to different environmental temperatures T.
4. The method for controlling the temperature of an automobile headlamp according to claim 3, characterized in that: when T is less than X, the headlight current is constant I, when X is less than T and less than X1, I1 and less than I, when X1 and T are less than X2, I2 and less than I1, when T is more than Xn, the headlight current is constant In, X is less than X1 and less than X2 and less than Xn, and In is less than I2 and less than I1 and less than I.
5. The method for controlling the temperature of an automobile headlamp according to claim 1, characterized in that: the unit time S is 1 to 2 seconds, I is 700Ma, I1 is 650Ma, I2 is 590Ma, In is 550Ma, X is 60 ℃, X1 is 65 ℃, X2 is 70 ℃, X2 is 75 ℃, and Y is 40 ℃.
6. The method for controlling the temperature of an automobile headlamp according to claim 4, wherein: when the current of the headlamp is reduced to a minimum value In, the brightness of the headlamp is greater than or equal to the minimum brightness required by driving safety at night.
7. The method for controlling the temperature of an automotive headlamp according to claim 1, 2, 3, 4, 5 or 6, characterized in that: the control units for the slow current drop are correspondingly arranged in a plurality according to different temperature sections.
8. The method for controlling the temperature of an automobile headlamp according to claim 7, characterized in that: and the control unit for slowly reducing the current is connected with the circuit through a temperature relay.
9. The method for controlling the temperature of an automobile headlamp according to claim 1, characterized in that: the temperature measuring unit for reading the ambient temperature of the headlamp in real time is arranged near the automobile headlamp light-emitting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010674961.6A CN111885767A (en) | 2020-07-14 | 2020-07-14 | Automobile headlamp temperature control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010674961.6A CN111885767A (en) | 2020-07-14 | 2020-07-14 | Automobile headlamp temperature control method |
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| CN111885767A true CN111885767A (en) | 2020-11-03 |
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| CN202010674961.6A Pending CN111885767A (en) | 2020-07-14 | 2020-07-14 | Automobile headlamp temperature control method |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105479A (en) * | 1986-08-09 | 1988-02-17 | 菲利蒲光灯制造公司 | The Method and circuits device that depends on brightness and temperature controlling of lamp of LCD is specifically used for throwing light on |
| CN103574544A (en) * | 2013-11-25 | 2014-02-12 | 奇瑞汽车股份有限公司 | LED automobile lamp driving system and control method thereof |
| CN105163429A (en) * | 2015-08-21 | 2015-12-16 | 无锡伊佩克科技有限公司 | Temperature measurement-based color temperature adaptive adjustment illumination method |
| CN105208701A (en) * | 2014-05-28 | 2015-12-30 | 天长市安发特照明电器有限公司 | LED street lamp intelligent control system |
| CN207665244U (en) * | 2017-12-22 | 2018-07-27 | 深圳市微安集成技术有限公司 | It is a kind of to increase the control circuit for continuously decreasing LED light brightness with temperature |
| CN108966429A (en) * | 2018-08-27 | 2018-12-07 | 常州星宇车灯股份有限公司 | A kind of automobile room lamp being able to achieve permanent illumination illumination and color temperature compensating |
| EP3469858A1 (en) * | 2016-06-10 | 2019-04-17 | Eaton Intelligent Power Limited | Current tuneback in light emitting diode luminaires |
| CN109951927A (en) * | 2019-04-17 | 2019-06-28 | 常州信息职业技术学院 | A kind of intelligent Light-control System and its light-dimming method |
| CN110087360A (en) * | 2019-04-10 | 2019-08-02 | 北京乐驾科技有限公司 | The adjustable LED of brightness and brightness adjusting method |
-
2020
- 2020-07-14 CN CN202010674961.6A patent/CN111885767A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105479A (en) * | 1986-08-09 | 1988-02-17 | 菲利蒲光灯制造公司 | The Method and circuits device that depends on brightness and temperature controlling of lamp of LCD is specifically used for throwing light on |
| CN103574544A (en) * | 2013-11-25 | 2014-02-12 | 奇瑞汽车股份有限公司 | LED automobile lamp driving system and control method thereof |
| CN105208701A (en) * | 2014-05-28 | 2015-12-30 | 天长市安发特照明电器有限公司 | LED street lamp intelligent control system |
| CN105163429A (en) * | 2015-08-21 | 2015-12-16 | 无锡伊佩克科技有限公司 | Temperature measurement-based color temperature adaptive adjustment illumination method |
| EP3469858A1 (en) * | 2016-06-10 | 2019-04-17 | Eaton Intelligent Power Limited | Current tuneback in light emitting diode luminaires |
| CN207665244U (en) * | 2017-12-22 | 2018-07-27 | 深圳市微安集成技术有限公司 | It is a kind of to increase the control circuit for continuously decreasing LED light brightness with temperature |
| CN108966429A (en) * | 2018-08-27 | 2018-12-07 | 常州星宇车灯股份有限公司 | A kind of automobile room lamp being able to achieve permanent illumination illumination and color temperature compensating |
| CN110087360A (en) * | 2019-04-10 | 2019-08-02 | 北京乐驾科技有限公司 | The adjustable LED of brightness and brightness adjusting method |
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Application publication date: 20201103 |