CN111267721A - LED brake lamp suitable for human eye visual characteristics - Google Patents
LED brake lamp suitable for human eye visual characteristics Download PDFInfo
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- CN111267721A CN111267721A CN202010119874.4A CN202010119874A CN111267721A CN 111267721 A CN111267721 A CN 111267721A CN 202010119874 A CN202010119874 A CN 202010119874A CN 111267721 A CN111267721 A CN 111267721A
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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
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/44—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating braking action or preparation for braking, e.g. by detection of the foot approaching the brake pedal
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- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
The invention discloses an LED brake lamp suitable for human visual characteristics, which comprises an ambient brightness sensor, a rear vehicle distance sensor, a speed sensor, an acceleration sensor, a brake signal line, an intelligent controller, an LED driving circuit and an LED light-emitting module, wherein the ambient brightness sensor, the rear vehicle distance sensor, the speed sensor, the acceleration sensor and the brake signal line input signals to the intelligent controller, the intelligent controller inputs control signals to the LED driving circuit, and the LED driving circuit inputs a driving current mode to the LED light-emitting module. The invention considers the visual characteristics of human eyes, can prevent glare hazard and can provide warning for the rear vehicle.
Description
Technical Field
The invention relates to the field of automobile brakes, in particular to an LED brake lamp suitable for human visual characteristics.
Background
The brake form on the current market is that stepping down brake pedal brake light and lighting immediately, touches brake pedal promptly and just lights the tail lamp, reaches timely warning efficiency, but the display lamp is in the permanent bright state all the time, tramples the brake block promptly, and the brake light all can light.
Later, a dynamic brake lamp is designed, after the automobile brakes, the LED lamp can display various dynamic images to warn a driver of a rear automobile, for example, patent 201020291259.3 discloses a locomotive LED rear tail lamp, which can display LED lamps with different patterns when the locomotive brakes, so that the locomotive can be more remarkably prompted to brake and drive during running.
It is needless to say that the recognition ability of the driver is limited when the vehicle is driven at a high speed, and it may not be time for the driver to recognize the pattern, and the pattern of the device is more likely to disperse the driver's efforts and increase driving accidents.
The patent "a car high-order stop lamp device" CN201320492064.9 discloses a stop lamp of area brake volume. However, the amount of braking is large, the luminance is high, glare is generated to human eyes, and particularly, when the ambient luminance is low at night or the like, the glare is likely to increase driving accidents.
In conclusion, no matter what type of brake lamp is adopted at present, the harm of glare of human eyes is not considered, and the vision of a driver of a rear vehicle cannot be protected; nor does it consider providing warnings based on rear vehicle distance and relative speed of the two vehicles.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the LED brake lamp which considers the visual characteristics of human eyes, can prevent glare hazard and can provide warning for a rear vehicle and is suitable for the visual characteristics of human eyes.
The purpose of the invention is realized by the following technical scheme.
The utility model provides a LED brake light that is fit for people's eye visual characteristic, includes ambient brightness sensor, back car distance, speed and acceleration sensor, brake signal line, intelligent control ware, LED drive circuit, the luminous module of LED, ambient brightness sensor, back car distance, speed and acceleration sensor, brake signal line are intelligent control ware input signal, the intelligent control ware is to LED drive circuit input control signal, LED drive circuit inputs the drive current mode to LED luminous module.
The environment brightness sensor is used for measuring the brightness of the environment, and is arranged at the tail of the automobile with the probe facing outwards.
The rear vehicle distance, speed and acceleration sensor is arranged at the tail of the vehicle, the probe of the rear vehicle distance, speed and acceleration sensor faces outwards, and the detection surface is horizontal to the plane of the vehicle.
The brake signal line is arranged below the brake pedal bracket.
The driving current mode comprises pulse intensity, width and frequency of the driving current, and the pulse intensity, width and frequency determining method comprises the following steps: according to the visual theory, LaC2a2Const, wherein LaBrightness of brake light, C environmental contrast, a viewing angle, and C ═ La/Lb，LbIs the ambient brightness;
the size of a car lamp is defined to be 30 cm, a brake lamp can be identified by 200 m of a designed car, the visual angle is divided into 5 points, the const is 1000, the visual requirement when the speed of the car is 100Km/h is met, and the formula L is usedaC2a2L is obtained after const3 a/L2 b≤400；
According to the theory of the lighting glare index UGR, in order not to produce glare hazard, the glare is acceptable, namely UGR is less than or equal to 16, and UGR is 8 lg
La，LbRespectively the brightness of the brake lamp and the environment, w is the visual angle, 2 minutes is taken, P is the position constant, and for the car lamp, 1 is taken to obtain L2 a/Lb≤25；
In combination with L3 a/L2 b≤400，L2 a/LbLess than or equal to 25, obtaining: l isa/Lb≤16，
At the same time, for clear identification of the brake lights, La/Lb≥4；
The ambient brightness sensor measures the ambient brightness LbAccording to La/Lb≤16，La/LbNot less than 4, obtaining LaA range of (d);
and calculating the time t of the rear vehicle colliding through the distance to the rear vehicle, the speed of the rear vehicle and the acceleration measured by the rear vehicle distance, speed and acceleration sensors.
The flicker frequency f is related to the time t as follows:
the human eye above 83Hz is basically regarded as constant brightness, the attention of the human eye and the flicker frequency are in a logarithmic relation, and the attention of the human eye and the time t are regarded as a power exponential relation. Thus, the frequency versus time relationship can be written as:
substituting t-5 s, f-83 Hz, t-20 s, and f-1 Hz. Obtaining:
the method for determining the current intensity of the LED brake lamp comprises the following steps:
brightness L of automobile brake lampaIn the range of [4Lb，16Lb]Corresponding to a current of [ Ia，Ib]If La<4LbThe drive current is taken as IaIf L isa>16LbThe drive current is taken as IbIf LaIn [4L ]b，16Lb]Internal, drive current is taken as Ia+(Ib-Ia)(La-4Lb)/12Lb。
Compared with the prior art, the invention has the advantages that: the brightness of the invention accords with the visual characteristics of human eyes, and no glare hazard is generated; and reminding a driver of the rear vehicle in a flashing mode according to the collision time of the rear vehicle.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a flow chart of the operation of the present invention.
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples.
As shown in fig. 1 and 2, the LED brake lamp suitable for human visual characteristics includes an ambient brightness sensor (luminosity probe), a rear distance, speed and acceleration sensor, a brake signal line, an Intelligent Controller (IC), an LED driving circuit, and an LED light emitting module, where the ambient brightness sensor, the rear distance, speed and acceleration sensor, and the brake signal line input signals to the intelligent controller, the intelligent controller inputs control signals to the LED driving circuit, and the LED driving circuit inputs a driving current mode to the LED light emitting module.
The environment brightness sensor is used for measuring the brightness of the environment, and is arranged at the tail of the automobile with the probe facing outwards.
The rear vehicle distance, speed and acceleration sensor is arranged at the tail of the vehicle, the probe of the rear vehicle distance, speed and acceleration sensor faces outwards, and the detection surface is horizontal to the plane of the vehicle.
The brake signal line is arranged below the brake pedal bracket.
The driving current mode comprises pulse intensity, width and frequency of the driving current, and the pulse intensity, width and frequency determining method comprises the following steps: according to the visual theory, LaC2a2Const, wherein LaBrightness of brake light, C environmental contrast, a viewing angle, and C ═ La/Lb，LbIs the ambient brightness;
the size of a car lamp is defined to be 30 cm, a brake lamp can be identified by 200 m of a designed car, the visual angle is divided into 5 points, according to an actual experiment, the visual requirement when const is 1000 and is more suitable for 100Km/h is taken, and the formula L is shown in the specificationaC2a2L is obtained after const3 a/L2 b≤400；
According to the theory of the lighting glare index UGR, in order not to produce glare hazard, namely, glare is acceptable, namely UGR is less than or equal to 16, and UGR is 8 lg
La，LbRespectively the brightness of the brake lamp and the environment, w is the visual angle, 2 minutes is taken, P is the position constant, and for the car lamp, 1 is taken to obtain L2 a/Lb≤25；
In combination with L3 a/L2 b≤400，L2 a/LbLess than or equal to 25, obtaining: l isa/Lb≤16，
At the same time, for clear identification of the brake lights, La/Lb≥4；
The ambient brightness sensor measures the ambient brightness LbAccording to La/Lb≤16，La/LbNot less than 4, obtaining LaExample (A) ofEnclosing;
according to vision theory, the human eye is sensitive to flicker. And calculating the time t of the rear vehicle colliding through the distance to the rear vehicle, the speed of the rear vehicle and the acceleration measured by the rear vehicle distance, speed and acceleration sensors.
The flicker frequency f is related to the time t as follows:
the human eye above 83Hz is basically regarded as constant brightness, the attention of the human eye and the flicker frequency are in a logarithmic relation, and the attention of the human eye and the time t are regarded as a power exponential relation. Thus, the frequency versus time relationship can be written as:
substituting t-5 s, f-83 Hz, t-20 s, and f-1 Hz. Obtaining:
the method for determining the current intensity of the LED brake lamp comprises the following steps:
brightness L of automobile brake lampaIn the range of [4Lb，16Lb]Corresponding to a current of [ Ia，Ib]If La<4LbThe drive current is taken as IaIf L isa>16LbThe drive current is taken as IbIf LaIn [4L ]b，16Lb]Internal, drive current is taken as Ia+(Ib-Ia)(La-4Lb)/12Lb。
IC working mode:
when the braking signal is given, the brightness measured by the ambient brightness sensor is passed through the IC to obtain the driving current, the distance, speed and acceleration of the vehicle are measured, and the pulse current, pulse frequency and flash frequency are given according to t.
The Ic signal is output to the LED driving circuit, the LED driving circuit supplies current, and the LED light-emitting module works.
The LED light-emitting module adopts an existing Camry LED brake lamp. The IC module adopts a singlechip, and the brightness sensor and the distance sensor both adopt products purchased from the market, and the models are TES-1330A and HR-SPR05 respectively. The brake signal is directly arranged on a switch circuit on the brake pad, so that the brake is switched on and is switched off without braking. The power supply in the driving circuit is provided by a 24V automobile battery.
The LED module consists of 10 1 WLEDs, the lamp has a luminance range of [40,160] cd and a corresponding current of [3.5,14.5] A.
Claims (6)
1. The utility model provides a LED brake light that is fit for human eye visual characteristic, its characterized in that includes ambient brightness sensor, back car distance, speed and acceleration sensor, brake signal line, intelligent control ware, LED drive circuit, LED light emitting module, ambient brightness sensor, back car distance, speed and acceleration sensor, brake signal line are intelligent control ware input signal, the intelligent control ware is to LED drive circuit input control signal, LED drive circuit inputs the drive current mode to LED light emitting module.
2. The LED brake lamp suitable for the visual characteristics of human eyes as claimed in claim 1, wherein the ambient light sensor is used for measuring the ambient light, and the ambient light sensor is arranged at the tail of the automobile with the probe facing outwards.
3. The LED brake lamp suitable for human vision characteristics of claim 1, wherein the rear vehicle distance, speed and acceleration sensor is arranged at the tail of the vehicle, the probe of the rear vehicle distance, speed and acceleration sensor faces outwards, and the detection surface is horizontal to the plane of the vehicle.
4. The LED brake lamp suitable for the visual characteristics of human eyes as claimed in claim 1, wherein the brake signal wire is arranged below the brake pedal bracket.
5. LED brake light adapted to the visual characteristics of human eyes according to any one of claims 1 to 4, characterized in that the driving currentThe mode comprises pulse intensity, width and frequency of the driving current, and the pulse intensity, width and frequency determination method comprises the following steps: according to the visual theory, LaC2a2Const, wherein LaBrightness of brake light, C environmental contrast, a viewing angle, and C ═ La/Lb，LbIs the ambient brightness;
the size of a car lamp is defined to be 30 cm, a brake lamp can be identified by 200 m of a designed car, the visual angle is divided into 5 points, the const is 1000, the visual requirement when the speed of the car is 100Km/h is met, and the formula L is usedaC2a2L is obtained after const3 a/L2 b≤400；
According to the theory of the lighting glare index UGR, in order to avoid glare hazard, the glare is acceptable, namely UGR is less than or equal to 16,
La，Lbrespectively the brightness of the brake lamp and the environment, w is the visual angle, 2 minutes is taken, P is the position constant, and for the car lamp, 1 is taken to obtain L2 a/Lb≤25；
In combination with L3 a/L2 b≤400，L2 a/LbLess than or equal to 25, obtaining: l isa/Lb≤16，
At the same time, for clear identification of the brake lights, La/Lb≥4；
The ambient brightness sensor measures the ambient brightness LbAccording to La/Lb≤16，La/LbNot less than 4, obtaining LaA range of (d);
calculating the time t of the rear vehicle collision through the distance between the rear vehicle and the rear vehicle, the speed between the rear vehicle and the rear vehicle, and the acceleration measured by the rear vehicle distance, speed and acceleration sensors, wherein the relationship between the flicker frequency f and the time t is as follows:
above 83Hz, the human eye is basically regarded as constant brightness, the human attention and the flicker frequency are in a logarithmic relation, and the human attention and the time t are regarded as a power exponential relation, so the relation between the frequency and the time can be written as follows:
substituting t-5 s, f-83 Hz, t-20 s, and f-1 Hz yields:
6. the LED stop lamp according to claim 5, wherein the LED stop lamp current intensity is determined by:
brightness L of automobile brake lampaIn the range of [4Lb，16Lb]Corresponding to a current of [ Ia，Ib]If La<4LbThe drive current is taken as IaIf L isa>16LbThe drive current is taken as IbIf LaIn [4L ]b，16Lb]Internal, drive current is taken as Ia+(Ib-Ia)(La-4Lb)/12Lb。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010119874.4A CN111267721A (en) | 2020-02-26 | 2020-02-26 | LED brake lamp suitable for human eye visual characteristics |
| PCT/CN2020/134719 WO2021169475A1 (en) | 2020-02-26 | 2020-12-09 | Led brake light adapted for human eye characteristics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010119874.4A CN111267721A (en) | 2020-02-26 | 2020-02-26 | LED brake lamp suitable for human eye visual characteristics |
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| Publication Number | Publication Date |
|---|---|
| CN111267721A true CN111267721A (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010119874.4A Withdrawn CN111267721A (en) | 2020-02-26 | 2020-02-26 | LED brake lamp suitable for human eye visual characteristics |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111267721A (en) |
| WO (1) | WO2021169475A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111806339A (en) * | 2020-07-08 | 2020-10-23 | 上海元城汽车技术有限公司 | High-mount stop lamp control method, system, device and equipment |
| WO2021169475A1 (en) * | 2020-02-26 | 2021-09-02 | 常州工学院 | Led brake light adapted for human eye characteristics |
| CN114074600A (en) * | 2020-08-13 | 2022-02-22 | 潍坊华光光电子有限公司 | Intelligent automobile brake lamp system and working method thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3752871B2 (en) * | 1998-12-25 | 2006-03-08 | 三菱自動車工業株式会社 | Brake lamp control device for automobile |
| GB2415098A (en) * | 2004-06-08 | 2005-12-14 | Adrian Lynley Ashley | Vehicle Hard Braking Alert System |
| CN102381244A (en) * | 2011-10-18 | 2012-03-21 | 奇瑞汽车股份有限公司 | Control system and control method for automobile brake lamp |
| CN102582510A (en) * | 2012-03-19 | 2012-07-18 | 奇瑞汽车股份有限公司 | Automatic warning tail lamp |
| CN105291965B (en) * | 2015-11-04 | 2017-12-05 | 石海水 | A kind of vehicle anticollision method and device |
| CN208134205U (en) * | 2017-10-20 | 2018-11-23 | 江苏检验检疫车辆灯具检测实验室 | A kind of brake lamp system and its application |
| CN109263539A (en) * | 2018-07-23 | 2019-01-25 | 赵文庆 | Vehicle emergency brake early warning system and method |
| CN111267721A (en) * | 2020-02-26 | 2020-06-12 | 常州工学院 | LED brake lamp suitable for human eye visual characteristics |
-
2020
- 2020-02-26 CN CN202010119874.4A patent/CN111267721A/en not_active Withdrawn
- 2020-12-09 WO PCT/CN2020/134719 patent/WO2021169475A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021169475A1 (en) * | 2020-02-26 | 2021-09-02 | 常州工学院 | Led brake light adapted for human eye characteristics |
| CN111806339A (en) * | 2020-07-08 | 2020-10-23 | 上海元城汽车技术有限公司 | High-mount stop lamp control method, system, device and equipment |
| CN114074600A (en) * | 2020-08-13 | 2022-02-22 | 潍坊华光光电子有限公司 | Intelligent automobile brake lamp system and working method thereof |
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| WO2021169475A1 (en) | 2021-09-02 |
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