Apparatus and method for controlling taillight of vehicle, capable of brightness control and visible light wireless communication

• US 9,242,595 B2
• Filed: 06/17/2014
• Issued: 01/26/2016
• Est. Priority Date: 07/08/2013
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Lim, Sangkyu, Kim, Myungsoon, Kang, Taegyu, Jang, Ilsoon, Jeong, Jindoo
• Primary Examiner(s): Tran, Thuy Vinh
• Application Number:
  US14/306,786
• Publication Number:
  US 20150008823A1
• Time in Patent Office: 588 Days
• Field of Search: 315/77, 315/80, 340/469, 340/479, 307/10.1, 307/10.8, 362/459, 362/487, 362/499
• US Class Current: 1/1
• CPC Class Codes: B60Q 1/2603 Attenuation of the light according to ambient luminiosity, e.g. for braking or direction indicating lamps
• CPC Class Codes: B60Q 1/30 for indicating rear of vehicle, e.g. by means of reflecting surfaces
• CPC Class Codes: B60Q 1/44 for indicating braking action or preparation for braking, e.g. by detection of the foot approaching the brake pedal
• CPC Class Codes: B60Q 1/535 to prevent rear-end collisions, e.g. by indicating safety distance at the rear of the vehicle
• CPC Class Codes: H05B 45/12 using optical feedback
• CPC Class Codes: H05B 47/105 in response to determined parameters
• CPC Class Codes: H05B 47/11 by determining the brightness or colour temperature of ambient light
• CPC Class Codes: H05B 47/195 the transmission using visible or infrared light
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

An apparatus and method for controlling the taillight of a vehicle are disclosed. The apparatus includes a visible light wireless communication data generation unit, a brightness control unit, a variable pulse position modulation (VPPM) signal generation unit, and a light source. The visible light wireless communication data generation unit generates information about the operation of a vehicle. The brightness control unit generates a brightness control value that is used to control the brightness of a light source installed at the tail of the vehicle. The variable pulse position modulation (VPPM) signal generation unit controls a pulse position and a pulse width within a unit pulse section of a pulse that controls the light source based on the information about the operation of the vehicle and the brightness control value.

Claims

1. A method of controlling a taillight of a vehicle, comprising:

generating information about an operation of a vehicle;

generating a brightness control value that is used to control brightness of a light source installed at a tail of the vehicle; and

controlling a pulse position and a pulse width within a unit pulse section of a pulse that controls the light source based on the information about the operation of the vehicle and the brightness control value,

wherein controlling the pulse position and the pulse width comprises controlling the pulse position based on the information about the operation of the vehicle and controlling the pulse width based on the brightness control value.

2. The method of claim 1, wherein the brightness control value provides three brightness levels so that the light source performs functions of a sidelight and brake light of the vehicle in an integrated manner.

3. The method of claim 2, wherein the three brightness levels comprise a first brightness level corresponding to a case where a deceleration pedal of the vehicle is fully activated, a second brightness level corresponding to a case where the light source is fully turned off, and a third brightness level corresponding to a predetermined brightness level between the first and second brightness levels.

4. The method of claim 3, wherein the first brightness level is higher than the second brightness level and the third brightness level, the third brightness level is higher than the second brightness level, and the third brightness level corresponds to any one of sidelight turn-on input and illumination sensor input.

5. The method of claim 4, wherein the brightness control value is set to the first brightness level if a distance between the vehicle and a following vehicle is shorter than a threshold.

6. The method of claim 5, wherein the brightness control value is generated based on any one of sidelight switch operation information, deceleration pedal operation information, user configuration information, illumination sensor input information, and distance input information.

7. The method of claim 1, wherein the information about the operation of the vehicle corresponds to any one of bits “

1” and

“

0”

depending on the pulse position.

8. The method of claim 7, wherein the information about the operation of the vehicle is generated based on any one of vehicle speed information, vehicle steering information, and vehicle deceleration pedal input information.

9. An apparatus for controlling a taillight of a vehicle, comprising:

a visible light wireless communication data generation unit configured to generate information about an operation of a vehicle;

a brightness control unit configured to generate a brightness control value that is used to control brightness of a light source installed at a tail of the vehicle;

a variable pulse position modulation (VPPM) signal generation unit configured to control a pulse position and a pulse width within a unit pulse section of a pulse that controls the light source based on the information about the operation of the vehicle and the brightness control value,

to convert a data signal into an optical signal, and to provide the optical signal to a following vehicle,

wherein the data signal controls the pulse position based on the information about the operation of the vehicle, and controls the pulse width based on the brightness control value.

10. The apparatus of claim 9, wherein the brightness control value provides three brightness levels so that the light source performs functions of a sidelight and brake light of the vehicle in an integrated manner.

11. The apparatus of claim 10, wherein the three brightness levels comprise a first brightness level corresponding to a case where a deceleration pedal of the vehicle is fully activated, a second brightness level corresponding to a case where the light source is fully turned off, and a third brightness level corresponding to a predetermined brightness level between the first and second brightness levels.

12. The apparatus of claim 11, wherein the first brightness level is higher than the second brightness level and the third brightness level, the third brightness level is higher than the second brightness level, and the third brightness level corresponds to any one of sidelight turn-on input and illumination sensor input.

13. The apparatus of claim 12, wherein the brightness control value is set to the first brightness level if a distance between the vehicle and a following vehicle is shorter than a threshold.

14. The apparatus of claim 13, wherein the brightness control value is generated based on any one of sidelight switch operation information, deceleration pedal operation information, user configuration information, illumination sensor input information, and distance input information.

15. The apparatus of claim 9, wherein the information about the operation of the vehicle corresponds to any one of bits “

1” and

“

0”

depending on the pulse position.

16. The apparatus of claim 15, wherein the information about the operation of the vehicle is generated based on any one of vehicle speed information, vehicle steering information, and vehicle deceleration pedal input information.