WO2021169475A1 - Led brake light adapted for human eye characteristics - Google Patents

Led brake light adapted for human eye characteristics Download PDF

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WO2021169475A1
WO2021169475A1 PCT/CN2020/134719 CN2020134719W WO2021169475A1 WO 2021169475 A1 WO2021169475 A1 WO 2021169475A1 CN 2020134719 W CN2020134719 W CN 2020134719W WO 2021169475 A1 WO2021169475 A1 WO 2021169475A1
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led
brake
brightness
speed
brake light
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PCT/CN2020/134719
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French (fr)
Chinese (zh)
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饶丰
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常州工学院
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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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  • the invention relates to the field of automobile brakes, in particular to an LED brake light suitable for human visual characteristics.
  • the current brake mode on the market is to step on the brake pedal and the brake light will light up immediately, that is, the tail light will be turned on when the brake pedal is touched, which achieves a timely warning effect, but the indicator light is always in a constant light state, that is, when the brake plate is stepped on, the brake light will be on. rise.
  • the patent "A high-position brake light device for automobiles" CN201320492064.9 discloses a brake light with braking amount.
  • the amount of braking is large and the brightness is high, and human eyes will appear glare, especially at night when the ambient brightness is low, the glare is likely to increase driving accidents.
  • the present invention provides an LED brake light suitable for human visual characteristics that considers human visual characteristics, can prevent glare hazards, and can provide warnings for following vehicles.
  • An LED brake light suitable for human visual characteristics including an environmental brightness sensor, a vehicle behind distance, speed and acceleration sensor, a brake signal line, an intelligent controller, an LED drive circuit, an LED light-emitting module, the environmental brightness sensor, the following vehicle
  • the distance, speed and acceleration sensor, and the brake signal line input signals to the intelligent controller, the intelligent controller inputs the control signal to the LED driving circuit, and the LED driving circuit inputs the driving current mode to the LED light emitting module.
  • the environmental brightness sensor is used to measure the brightness of the environment, and the environmental brightness sensor is arranged at the rear of the car with the probe facing outward.
  • the following distance, speed and acceleration sensors are arranged at the rear of the car, and the probes of the following distance, speed and acceleration sensors face outwards and the detection surface is level with the plane of the car.
  • the brake signal line is arranged under the brake pedal bracket.
  • La and L b are the brightness of the brake light and the brightness of the environment, respectively, w is the viewing angle, take 2 points, and P is the position constant. For car lights, take 1, and get: L 2 a /L b ⁇ 25;
  • Ambient light sensor measures the ambient brightness L b, according L a / L b ⁇ 16, L a / L b ⁇ 4, to give a range of L a;
  • the human eye is above 83 Hz, which is basically regarded as constant brightness, and the human attention has a logarithmic relationship with the flicker frequency.
  • the present invention regards the human eye attention and the time t as a power exponential relationship. Therefore, the relationship between frequency and time can be written as:
  • the method for determining the current intensity of the LED brake light is:
  • the advantages of the present invention are: the brightness of the present invention conforms to the visual characteristics of human eyes and does not produce glare hazards; and the following vehicle drivers are reminded by flashing according to the time of the collision of the following vehicle.
  • Figure 1 is a schematic diagram of the structure of the present invention.
  • Figure 2 is a working flow chart of the present invention.
  • an LED brake light suitable for human visual characteristics includes an environmental brightness sensor (photometric probe), a distance, speed and acceleration sensor for the vehicle behind, a brake signal line, an intelligent controller (IC),
  • the LED driving circuit, the LED light emitting module, the environmental brightness sensor, the following distance, speed and acceleration sensor, and the brake signal line input signals to the intelligent controller, and the intelligent controller inputs the control signal to the LED driving circuit, and the LED drives
  • the circuit inputs the driving current mode to the LED light-emitting module.
  • the environmental brightness sensor is used to measure the brightness of the environment, and the environmental brightness sensor is arranged at the rear of the car with the probe facing outward.
  • the following distance, speed and acceleration sensors are arranged at the rear of the car, and the probes of the following distance, speed and acceleration sensors face outwards and the detection surface is level with the plane of the car.
  • the brake signal line is arranged under the brake pedal bracket.
  • La and L b are the brightness of the brake light and the brightness of the environment, respectively, w is the viewing angle, take 2 points, and P is the position constant. For car lights, take 1, and get: L 2 a /L b ⁇ 25;
  • Ambient light sensor measures the ambient brightness L b, according L a / L b ⁇ 16, L a / L b ⁇ 4, to give a range of L a;
  • the human eye is more sensitive to flicker. Calculate the time t of the collision of the following vehicle through the distance to the following vehicle, the speed and acceleration measured by the following vehicle distance, speed and acceleration sensors.
  • the human eye is above 83 Hz, which is basically regarded as constant brightness, and the human attention has a logarithmic relationship with the flicker frequency.
  • the present invention regards the human eye attention and the time t as a power exponential relationship. Therefore, the relationship between frequency and time can be written as:
  • the method for determining the current intensity of the LED brake light is:
  • the brightness measured by the ambient brightness sensor is passed through the IC to obtain the driving current, and t is calculated from the values measured by the distance, speed and acceleration sensors of the following vehicle, and the pulse current is given according to t, as well as the pulse frequency and flicker. frequency.
  • the Ic signal is output to the LED drive circuit, and the LED drive circuit gives current, and the LED light-emitting module works.
  • the LED light-emitting module uses off-the-shelf Camry LED brake lights.
  • the IC module uses a single-chip microcomputer, and both the brightness sensor and the distance sensor are products purchased on the market, the models are TES-1330A and HR-SPR05 respectively.
  • the brake signal is directly installed with a switch circuit on the brake pad, and the brake is turned on, and the circuit is disconnected if the brake is not applied.
  • the power supply in the drive circuit is provided by a 24V car battery.
  • the LED module is composed of 10 1W LEDs, the brightness range of the lamp is [40,160]cd, and the corresponding current is [3.5,14.5]A.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

An LED brake light adapted for human eye characteristics comprises an ambient brightness sensor, a rear vehicle distance, speed and acceleration sensor, a brake signal line, a smart controller, an LED driving circuit, and an LED light-emitting module. The ambient brightness sensor, the rear vehicle distance, speed and acceleration sensor, and the brake signal line input signals to the smart controller. The smart controller inputs a control signal to the LED driving circuit. The LED driving circuit inputs a driving current mode to the LED light-emitting module. The brake light takes into consideration human eye characteristics, thereby protecting the eyes from harm caused by glare, and providing warning to a vehicle behind.

Description

一种适合人眼视觉特性的LED刹车灯An LED brake light suitable for human visual characteristics 技术领域Technical field
本发明涉及汽车刹车领域，特别是一种适合人眼视觉特性的LED刹车灯。The invention relates to the field of automobile brakes, in particular to an LED brake light suitable for human visual characteristics.
背景技术Background technique
当前市场上的刹车形式是踩下刹车踏板刹车灯立即亮起，即触动刹车踏板就亮起尾灯，达到及时警示功效，但是显示灯始终处于恒亮状态，即踩踏刹车板，刹车灯均会亮起。The current brake mode on the market is to step on the brake pedal and the brake light will light up immediately, that is, the tail light will be turned on when the brake pedal is touched, which achieves a timely warning effect, but the indicator light is always in a constant light state, that is, when the brake plate is stepped on, the brake light will be on. rise.
后来又有人设计了一款动感刹车灯，汽车刹车后，LED灯能显示各种动态的图像，提到警示后车驾驶员的作用，例如，专利201020291259.3就公布了一种“机车LED后尾灯”，一种机车在刹车时后灯能显示不同图案的LED灯，使机车行驶过程中能更醒目的对机车刹车、行车进行有效的提示.Later, someone designed a dynamic brake light. After the car brakes, the LED light can display various dynamic images. It is mentioned that the role of warning the driver of the car behind is mentioned. For example, the patent 201020291259.3 published a kind of "LED rear light for locomotives". , A kind of LED lights whose rear lights can display different patterns when the locomotive is braking, so that the locomotive can be more eye-catching and effective when the locomotive is braking and driving.
毫无疑问，在高速行驶时，司机的识别能力有限，等后车司机识别图形，可能已经来不及了，同时，该装置的图案更多的时候容易分散后车驾驶员的精力，反而容易增加驾驶事故。Undoubtedly, when driving at high speed, the driver’s recognition ability is limited. It may be too late for the driver behind to recognize the graphics. At the same time, when the device has more patterns, it is easy to distract the driver of the following car, and it is easy to increase driving. accident.
专利“一种汽车高位刹车灯装置”CN201320492064.9，公开了一种带刹车量的刹车灯。但是，刹车量大，亮度高，人眼会出现眩光，特别是晚上等环境亮度小的时候，眩光容易增加驾驶事故。The patent "A high-position brake light device for automobiles" CN201320492064.9 discloses a brake light with braking amount. However, the amount of braking is large and the brightness is high, and human eyes will appear glare, especially at night when the ambient brightness is low, the glare is likely to increase driving accidents.
综上，目前无论采用何种形式的刹车灯，都没有考虑人眼眩光危害，无法保护后车驾驶员的视觉；也没有考虑根据后车距离和两车相对速度提供警示。In summary, no matter what form of brake light is used, it does not consider the hazard of human eye glare and cannot protect the vision of the driver of the following vehicle; nor does it consider providing warnings based on the distance of the vehicle behind and the relative speed of the two vehicles.
发明内容Summary of the invention
针对现有技术中存在的问题，本发明提供了一种考虑人眼视觉特性，能防止眩光危害，能为后车提供警示的适合人眼视觉特性的LED刹车灯。In view of the problems existing in the prior art, the present invention provides an LED brake light suitable for human visual characteristics that considers human visual characteristics, can prevent glare hazards, and can provide warnings for following vehicles.
本发明的目的通过以下技术方案实现。The purpose of the present invention is achieved through the following technical solutions.
一种适合人眼视觉特性的LED刹车灯，包括环境亮度传感器、后车距离、速度和加速度传感器、刹车信号线、智能控制器、LED驱动电路、LED发光模块，所述环境亮度传感器、后车距离、速度和加速度传感器、刹车信号线向智能控制器输入信号，所述智能控制器向LED驱动电路输入控制信号，所述LED驱动电路向LED发光模块输入驱动电流模式。An LED brake light suitable for human visual characteristics, including an environmental brightness sensor, a vehicle behind distance, speed and acceleration sensor, a brake signal line, an intelligent controller, an LED drive circuit, an LED light-emitting module, the environmental brightness sensor, the following vehicle The distance, speed and acceleration sensor, and the brake signal line input signals to the intelligent controller, the intelligent controller inputs the control signal to the LED driving circuit, and the LED driving circuit inputs the driving current mode to the LED light emitting module.
所述环境亮度传感器用于测量环境的亮度，所述环境亮度传感器设置在汽车尾部、探头朝外。The environmental brightness sensor is used to measure the brightness of the environment, and the environmental brightness sensor is arranged at the rear of the car with the probe facing outward.
所述后车距离、速度和加速度传感器设置在汽车尾部，所述后车距离、速度和加速度传感器的探头朝外且探测面与汽车平面水平。The following distance, speed and acceleration sensors are arranged at the rear of the car, and the probes of the following distance, speed and acceleration sensors face outwards and the detection surface is level with the plane of the car.
所述刹车信号线设置在刹车踏板支架的下方。The brake signal line is arranged under the brake pedal bracket.
所述驱动电流模式包括驱动电流的脉冲强度、宽度和频率，所述脉冲强度、宽度和频率确定方法包括：根据视觉理论:L aC 2a 2＝const，其中L a为刹车灯的亮度，C为环境对比度，a为视角，C＝L a/L b，L b是环境亮度； The current driving mode comprises the driving current pulse intensity, frequency and width, the pulse intensity, frequency and width determining method comprising: based on a visual Theory: L a C 2 a 2 = const, where L a is the brightness of the brake lights, C is the environmental contrast, a is the viewing angle, C=L a /L b , and L b is the environmental brightness;
定义车灯大小为30厘米，设计后车200米能识别刹车灯，视角得5分，取const＝1000符合车速为100Km/h时的视觉要求，由公式L aC 2a 2＝const得:L 3 a/L 2 b≤400； Defined size of 30 cm lights, vehicle 200 meters designed to identify the brake lights, 5 points perspective, take const = 1000 to meet the speed of 100Km / visual requirements of H, by the equation L a C 2 a 2 = const obtained: L 3 a /L 2 b ≤400;
根据照明眩光指数UGR的理论，为了不产生眩光危害，设置眩光可以接受，即UGR≤16，UGR＝8*lg
Figure PCTCN2020134719-appb-000001
According to the theory of lighting glare index UGR, in order not to produce glare hazards, it is acceptable to set glare, that is, UGR≤16, UGR=8*lg
Figure PCTCN2020134719-appb-000001
La，L b分别是刹车灯的亮度和环境的亮度，w为视角，取2分，P为位置常数，对于车灯，取1，得:L 2 a/L b≤25； La and L b are the brightness of the brake light and the brightness of the environment, respectively, w is the viewing angle, take 2 points, and P is the position constant. For car lights, take 1, and get: L 2 a /L b ≤25;
联合L 3 a/L 2 b≤400，L 2 a/L b≤25，可得：L a/L b≤16， Combining L 3 a /L 2 b ≤400 and L 2 a /L b ≤25, we can get: L a /L b ≤16,
同时，为了清晰识别刹车灯，L a/L b≥4； Meanwhile, in order to identify clearly the brake light, L a / L b ≥4;
环境亮度传感器测得环境亮度L b，根据L a/L b≤16，L a/L b≥4，得到L a的范围； Ambient light sensor measures the ambient brightness L b, according L a / L b ≤16, L a / L b ≥4, to give a range of L a;
通过后车距离、速度和加速度传感器测得的与后车距离、后车速度和加速度计算后车撞上的时间t。Calculate the time t of the collision of the following vehicle through the distance to the following vehicle, the speed and acceleration measured by the following vehicle distance, speed and acceleration sensors.
闪烁频率f与时间t的关系如下：The relationship between flicker frequency f and time t is as follows:
人眼83Hz以上，基本视为恒亮，人的注意力与闪烁频率成对数关系，本发明将人眼注意力与时间t看成幂指数关系。因此，频率与时间的关系可以写成：The human eye is above 83 Hz, which is basically regarded as constant brightness, and the human attention has a logarithmic relationship with the flicker frequency. The present invention regards the human eye attention and the time t as a power exponential relationship. Therefore, the relationship between frequency and time can be written as:
Figure PCTCN2020134719-appb-000002
Figure PCTCN2020134719-appb-000002
将t＝5s,f＝83Hz,t＝20s,f＝1Hz代入。得到：Substitute t=5s, f=83Hz, t=20s, f=1Hz. get:
Figure PCTCN2020134719-appb-000003
Figure PCTCN2020134719-appb-000003
所述LED刹车灯电流强度确定方法为：The method for determining the current intensity of the LED brake light is:
汽车刹车灯的亮度L a范围为[4L b，16L b]，对应电流为[I a，I b].若L a<4L b，驱动电流取I a，若L a>16L b，驱动电流取I b.若L a在[4L b，16L b]内，驱动电流取I a+(I b-I a)(L a-4L b)/12L b。 Vehicle brake lights luminance L a range of [4L b, 16L b], corresponding to the current [I a, I b]. If L a <4L b, the driving current takes I a, if L a> 16L b, the drive current take I b. If L a in [4L b, 16L b] the drive current takes I a + (I b -I a ) (L a -4L b) / 12L b.
相比于现有技术，本发明的优点在于：本发明光亮度符合人眼视觉特性，不产生眩光危害；根据后车撞上时间采用闪烁的方式提醒后车司机。Compared with the prior art, the advantages of the present invention are: the brightness of the present invention conforms to the visual characteristics of human eyes and does not produce glare hazards; and the following vehicle drivers are reminded by flashing according to the time of the collision of the following vehicle.
附图说明Description of the drawings
图1为本发明的结构示意图。Figure 1 is a schematic diagram of the structure of the present invention.
图2为本发明的工作流程图。Figure 2 is a working flow chart of the present invention.
具体实施方式Detailed ways
下面结合说明书附图和具体的实施例，对本发明作详细描述。The present invention will be described in detail below with reference to the drawings and specific embodiments of the specification.
如图1和图2所示，一种适合人眼视觉特性的LED刹车灯，包括环境亮度传感器(光度探头)、后车距离、速度和加速度传感器、刹车信号线、智能控制器(IC)、LED驱动电路、LED发光模块，所述环境亮度传感器、后车距离、速度和加速度传感器、刹车信号线向智能控制器输入信号，所述智能控制器向LED驱动电路输入控制信号，所述LED驱动电路向LED发光模块输入驱动电流模式。As shown in Figure 1 and Figure 2, an LED brake light suitable for human visual characteristics includes an environmental brightness sensor (photometric probe), a distance, speed and acceleration sensor for the vehicle behind, a brake signal line, an intelligent controller (IC), The LED driving circuit, the LED light emitting module, the environmental brightness sensor, the following distance, speed and acceleration sensor, and the brake signal line input signals to the intelligent controller, and the intelligent controller inputs the control signal to the LED driving circuit, and the LED drives The circuit inputs the driving current mode to the LED light-emitting module.
所述环境亮度传感器用于测量环境的亮度，所述环境亮度传感器设置在汽车尾部、探头朝外。The environmental brightness sensor is used to measure the brightness of the environment, and the environmental brightness sensor is arranged at the rear of the car with the probe facing outward.
所述后车距离、速度和加速度传感器设置在汽车尾部，所述后车距离、速度和加速度传感器的探头朝外且探测面与汽车平面水平。The following distance, speed and acceleration sensors are arranged at the rear of the car, and the probes of the following distance, speed and acceleration sensors face outwards and the detection surface is level with the plane of the car.
所述刹车信号线设置在刹车踏板支架的下方。The brake signal line is arranged under the brake pedal bracket.
所述驱动电流模式包括驱动电流的脉冲强度、宽度和频率，所述脉冲强度、宽度和频率确定方法包括：根据视觉理论:L aC 2a 2＝const，其中L a为刹车灯的亮度，C为环境对比度，a为视角，C＝L a/L b，L b是环境亮度； The current driving mode comprises the driving current pulse intensity, frequency and width, the pulse intensity, frequency and width determining method comprising: based on a visual Theory: L a C 2 a 2 = const, where L a is the brightness of the brake lights, C is the environmental contrast, a is the viewing angle, C=L a /L b , and L b is the environmental brightness;
定义车灯大小为30厘米，设计后车200米能识别刹车灯，视角得5分，根据实际实验，取const＝1000比较适合100Km/h时的视觉要求，由公式L aC 2a 2＝const得:L 3 a/L 2 b≤400； Lamp defined size of 30 cm, designed to identify the vehicle brake lights 200 meters, angle 5 points, based on the actual experiment, takes const = 1000 compare 100Km / visual requirements of H, by the equation L a C 2 a 2 = const is: L 3 a /L 2 b ≤400;
根据照明眩光指数UGR的理论，为了不产生眩光危害，即眩光可以接受，即UGR≤16，According to the theory of lighting glare index UGR, in order not to produce glare hazards, that is, glare is acceptable, that is, UGR≤16,
UGR＝8*lg
Figure PCTCN2020134719-appb-000004
UGR=8*lg
Figure PCTCN2020134719-appb-000004
La，L b分别是刹车灯的亮度和环境的亮度，w为视角，取2分，P为位置常数，对于车灯，取1，得:L 2 a/L b≤25； La and L b are the brightness of the brake light and the brightness of the environment, respectively, w is the viewing angle, take 2 points, and P is the position constant. For car lights, take 1, and get: L 2 a /L b ≤25;
联合L 3 a/L 2 b≤400，L 2 a/L b≤25，可得：L a/L b≤16， Combining L 3 a /L 2 b ≤400 and L 2 a /L b ≤25, we can get: L a /L b ≤16,
同时，为了清晰识别刹车灯，L a/L b≥4； Meanwhile, in order to identify clearly the brake light, L a / L b ≥4;
环境亮度传感器测得环境亮度L b，根据L a/L b≤16，L a/L b≥4，得到L a的范围； Ambient light sensor measures the ambient brightness L b, according L a / L b ≤16, L a / L b ≥4, to give a range of L a;
根据视觉理论，人眼对闪烁比较敏感。通过后车距离、速度和加速度传感器测得的与后车距离、后车速度和加速度计算后车撞上的时间t。According to visual theory, the human eye is more sensitive to flicker. Calculate the time t of the collision of the following vehicle through the distance to the following vehicle, the speed and acceleration measured by the following vehicle distance, speed and acceleration sensors.
闪烁频率f与时间t的关系如下：The relationship between flicker frequency f and time t is as follows:
人眼83Hz以上，基本视为恒亮，人的注意力与闪烁频率成对数关系，本发明将人眼注意 力与时间t看成幂指数关系。因此，频率与时间的关系可以写成：The human eye is above 83 Hz, which is basically regarded as constant brightness, and the human attention has a logarithmic relationship with the flicker frequency. The present invention regards the human eye attention and the time t as a power exponential relationship. Therefore, the relationship between frequency and time can be written as:
Figure PCTCN2020134719-appb-000005
Figure PCTCN2020134719-appb-000005
将t＝5s,f＝83Hz,t＝20s,f＝1Hz代入。得到：Substitute t=5s, f=83Hz, t=20s, f=1Hz. get:
Figure PCTCN2020134719-appb-000006
Figure PCTCN2020134719-appb-000006
LED刹车灯电流强度确定方法为：The method for determining the current intensity of the LED brake light is:
汽车刹车灯的亮度L a范围为[4L b，16L b]，对应电流为[I a，I b].若L a<4L b，驱动电流取I a，若L a>16L b，驱动电流取I b.若L a在[4L b，16L b]内，驱动电流取I a+(I b-I a)(L a-4L b)/12L b。 Vehicle brake lights luminance L a range of [4L b, 16L b], corresponding to the current [I a, I b]. If L a <4L b, the driving current takes I a, if L a> 16L b, the drive current take I b. If L a in [4L b, 16L b] the drive current takes I a + (I b -I a ) (L a -4L b) / 12L b.
IC工作方式：IC working method:
当刹车信号给出后，环境亮度传感器测得的亮度经过IC得到驱动电流，后车距离、速度和加速度传感器测得的值计算出t,，根据t给出脉冲电流，以及脉冲的频率和闪烁次数。When the brake signal is given, the brightness measured by the ambient brightness sensor is passed through the IC to obtain the driving current, and t is calculated from the values measured by the distance, speed and acceleration sensors of the following vehicle, and the pulse current is given according to t, as well as the pulse frequency and flicker. frequency.
Ic信号输出到LED驱动电路中，由LED驱动电路给出电流，LED发光模块工作。The Ic signal is output to the LED drive circuit, and the LED drive circuit gives current, and the LED light-emitting module works.
LED发光模块采用现成的凯美瑞LED刹车灯。IC模块采用单片机，亮度传感器和距离传感器均采用市场购买的产品，型号分别为TES-1330A和HR-SPR05。刹车信号直接在刹车片安装一个开关电路，刹车就通路，不刹车就断路。驱动电路中电源由24V汽车电池提供。The LED light-emitting module uses off-the-shelf Camry LED brake lights. The IC module uses a single-chip microcomputer, and both the brightness sensor and the distance sensor are products purchased on the market, the models are TES-1330A and HR-SPR05 respectively. The brake signal is directly installed with a switch circuit on the brake pad, and the brake is turned on, and the circuit is disconnected if the brake is not applied. The power supply in the drive circuit is provided by a 24V car battery.
LED模块由10颗1WLED组成，灯的亮度范围为[40,160]cd,对应电流为[3.5,14.5]A。The LED module is composed of 10 1W LEDs, the brightness range of the lamp is [40,160]cd, and the corresponding current is [3.5,14.5]A.

Claims (6)

  1. 一种适合人眼视觉特性的LED刹车灯，其特征在于包括环境亮度传感器、后车距离、速度和加速度传感器、刹车信号线、智能控制器、LED驱动电路、LED发光模块，所述环境亮度传感器、后车距离、速度和加速度传感器、刹车信号线向智能控制器输入信号，所述智能控制器向LED驱动电路输入控制信号，所述LED驱动电路向LED发光模块输入驱动电流模式。An LED brake light suitable for human visual characteristics, which is characterized by comprising an environmental brightness sensor, a distance to the vehicle behind, a speed and acceleration sensor, a brake signal line, an intelligent controller, an LED drive circuit, an LED light-emitting module, and the environmental brightness sensor , The following vehicle distance, speed and acceleration sensors, and the brake signal line input signals to the intelligent controller, the intelligent controller inputs the control signal to the LED drive circuit, and the LED drive circuit inputs the drive current mode to the LED light-emitting module.
  2. 根据权利要求1所述的一种适合人眼视觉特性的LED刹车灯，其特征在于所述环境亮度传感器用于测量环境的亮度，所述环境亮度传感器设置在汽车尾部、探头朝外。The LED brake light suitable for human visual characteristics according to claim 1, characterized in that the environmental brightness sensor is used to measure the brightness of the environment, and the environmental brightness sensor is arranged at the rear of the car with the probe facing outward.
  3. 根据权利要求1所述的一种适合人眼视觉特性的LED刹车灯，其特征在于所述后车距离、速度和加速度传感器设置在汽车尾部，所述后车距离、速度和加速度传感器的探头朝外且探测面与汽车平面水平。The LED brake light suitable for human visual characteristics according to claim 1, characterized in that the distance, speed and acceleration sensors of the following vehicle are arranged at the rear of the vehicle, and the probes of the distance, speed and acceleration sensors of the following vehicle face Outside and the detection surface is level with the plane of the car.
  4. 根据权利要求1所述的一种适合人眼视觉特性的LED刹车灯，其特征在于所述刹车信号线设置在刹车踏板支架的下方。The LED brake light suitable for human visual characteristics according to claim 1, wherein the brake signal line is arranged under the brake pedal bracket.
  5. 根据权利要求1-4任意一项所述的一种适合人眼视觉特性的LED刹车灯，其特征在于所述驱动电流模式包括驱动电流的脉冲强度、宽度和频率，所述脉冲强度、宽度和频率确定方法包括：根据视觉理论:L aC 2a 2＝const，其中L a为刹车灯的亮度，C为环境对比度，a为视角，C＝L a/L b，L b是环境亮度； The LED brake light suitable for human visual characteristics according to any one of claims 1-4, characterized in that the driving current mode includes the pulse intensity, width and frequency of the driving current, the pulse intensity, width and frequency determining method comprising: based on a visual theory: L a C 2 a 2 = const, where L a is the brightness of the brake lights, C is the environmental contrast, a is the angle of view, C = L a / L b , L b is the ambient brightness;
    定义车灯大小为30厘米，设计后车200米能识别刹车灯，视角得5分，取const＝1000符合车速为100Km/h时的视觉要求，由公式L aC 2a 2＝const得:L 3 a/L 2 b≤400； Defined size of 30 cm lights, vehicle 200 meters designed to identify the brake lights, 5 points perspective, take const = 1000 to meet the speed of 100Km / visual requirements of H, by the equation L a C 2 a 2 = const obtained: L 3 a /L 2 b ≤400;
    根据照明眩光指数UGR的理论，为了不产生眩光危害，设置眩光可以接受，即UGR≤16，
    Figure PCTCN2020134719-appb-100001
    According to the theory of lighting glare index UGR, in order not to produce glare hazards, it is acceptable to set glare, that is, UGR≤16,
    Figure PCTCN2020134719-appb-100001
    La，L b分别是刹车灯的亮度和环境的亮度，w为视角，取2分，P为位置常数，对于车灯，取1，得:L 2 a/L b≤25； La and L b are the brightness of the brake light and the brightness of the environment, respectively, w is the viewing angle, take 2 points, and P is the position constant. For car lights, take 1, and get: L 2 a /L b ≤25;
    联合L 3 a/L 2 b≤400，L 2 a/L b≤25，可得：L a/L b≤16， Combining L 3 a /L 2 b ≤400 and L 2 a /L b ≤25, we can get: L a /L b ≤16,
    同时，为了清晰识别刹车灯，L a/L b≥4； Meanwhile, in order to identify clearly the brake light, L a / L b ≥4;
    环境亮度传感器测得环境亮度L b，根据L a/L b≤16，L a/L b≥4，得到L a的范围； Ambient light sensor measures the ambient brightness L b, according L a / L b ≤16, L a / L b ≥4, to give a range of L a;
    通过后车距离、速度和加速度传感器测得的与后车距离、后车速度和加速度计算后车撞上的时间t，闪烁频率f与时间t的关系如下：Calculate the time t of the collision of the following car through the distance, speed and acceleration sensors of the following car, the speed and acceleration of the following car. The relationship between the flicker frequency f and the time t is as follows:
    人眼83Hz以上，基本视为恒亮，人的注意力与闪烁频率成对数关系，将人眼注意力与时间t看成幂指数关系，因此，频率与时间的关系可以写成：The human eye is above 83 Hz, which is basically regarded as constant brightness. The human attention and the flicker frequency have a logarithmic relationship. The human eye attention and time t are regarded as a power exponential relationship. Therefore, the relationship between frequency and time can be written as:
    Figure PCTCN2020134719-appb-100002
    Figure PCTCN2020134719-appb-100002
    将t＝5s,f＝83Hz,t＝20s,f＝1Hz代入，得到：Substituting t=5s, f=83Hz, t=20s, f=1Hz, we get:
    Figure PCTCN2020134719-appb-100003
    Figure PCTCN2020134719-appb-100003
  6. 根据权利要求5所述的一种适合人眼视觉特性的LED刹车灯，其特征在于所述LED刹车灯电流强度确定方法为：The LED brake light suitable for human visual characteristics according to claim 5, wherein the method for determining the current intensity of the LED brake light is:
    汽车刹车灯的亮度L a范围为[4L b，16L b]，对应电流为[I a，I b].若L a<4L b，驱动电流取I a，若L a>16L b，驱动电流取I b.若L a在[4L b，16L b]内，驱动电流取I a+(I b-I a)(L a-4L b)/12L b。 Vehicle brake lights luminance L a range of [4L b, 16L b], corresponding to the current [I a, I b]. If L a <4L b, the driving current takes I a, if L a> 16L b, the drive current take I b. If L a in [4L b, 16L b] the drive current takes I a + (I b -I a ) (L a -4L b) / 12L b.
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CN111267721A (en) * 2020-02-26 2020-06-12 常州工学院 LED brake lamp suitable for human eye visual 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
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