METHOD AND DEVICE FOR A VEHICLE-BASED ILLUMINATION IN INSUFFICIENTLY ILLUMINATED TRAFFIC ENVIRONMENTS

• US 20120127313A1
• Filed: 05/20/2010
• Published: 05/24/2012
• Est. Priority Date: 05/29/2009
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Ehlgen, Tobias
• Application Number:
  US13/321,949
• Publication Number:
  US 20120127313A1
• Time in Patent Office: Days
• US Class Current: 348/149
• CPC Class Codes: B60Q 1/1423 Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
• CPC Class Codes: B60Q 2300/054 Variable non-standard intensity, i.e. emission of various beam intensities different from standard intensities, e.g. continuous or stepped transitions of intensity
• CPC Class Codes: B60Q 2300/056 Special anti-blinding beams, e.g. a standard beam is chopped or moved in order not to blind
• CPC Class Codes: B60Q 2300/42 oncoming vehicle
• CPC Class Codes: B60Q 2300/45 Special conditions, e.g. pedestrians, road signs or potential dangers

Abstract

In a method for a vehicle-based illumination of traffic environments, light is irradiated from a vehicle into a traffic environment to detect critical objects, with the intensity averaged over time being reduced when producing the light so as to prevent the human eye from being blinded. The light is irradiated intermittently into the traffic environment in accordance with ON periods and OFF periods. In an OFF period, no light is irradiated from the light source into the traffic environment, while during an ON period the light is irradiated in the traffic environment.

Claims

1-10. -10. (canceled)

11. A method for a vehicle-based illumination of traffic environment, comprising:

irradiating, using at least one light source in a vehicle, light from the vehicle into a traffic environment, the light having a momentary intensity sufficient for blinding the human eye; and

detecting at least one critical object in the traffic environment with the aid of the irradiated light;

wherein, when a critical object is detected, the intensity of the light averaged over time is reduced in order to prevent blinding the human eye, by irradiating the light intermittently into the traffic environment in accordance with ON periods and OFF periods, wherein the light source irradiates no light into the traffic environment during the OFF periods, and wherein the light is irradiated into the traffic environment during the ON periods.

12. The method as recited in claim 11, further comprising:

taking a picture of the traffic environment during a selected ON period, wherein the taking of the picture begins and ends within the selected ON period.

13. The method as recited in claim 11, wherein the light is irradiated over the ON and OFF periods at an average intensity value which is no higher than 10% of the average intensity value of the light irradiated during an ON period.

14. The method as recited in claim 11, wherein the ON period has a duration no longer than 100 ms, and the OFF period has a duration which is a multiple N of the ON period, where N>

10.

15. The method as recited in claim 11, wherein at least two light sources are provided, and wherein in the OFF period a first light source oriented in a first direction produces no light while a second light source oriented in a second direction produces light, and wherein in the ON period both the first and second light sources produce light.

16. The method as recited in claim 15, further comprising:

determining a critical direction in which a light-sensitive object exists in the traffic environment;

assigning to the critical direction a light source which lies in the critical direction; and

during the OFF period, switching off the assigned light source which lies in the critical direction and switching ON the other light source which is not oriented in the critical direction.

17. A device for a vehicle-based illumination of traffic environments, comprising:

at least one vehicle light source oriented towards a traffic environment and configured to irradiate light having a momentary intensity sufficient for blinding the human eye;

an object detection device configured to detect at least one critical object;

a picture taking device connected to the clock pulse generator and configured to take pictures of the traffic environment during the ON periods; and

at least one clock pulse generator configured to selectively supply electrical current to the vehicle light source intermittently in accordance with ON periods and OFF periods when a critical object is detected, to reduce the intensity of the irradiated light averaged over time to prevent the human eye from being blinded.

18. The device as recited in claim 17, further comprising:

a synchronization device connected to the picture taking device and configured to output a picture taking trigger signal to the picture taking device at one of (i) the start of an ON period or (ii) a time point offset from the start of the ON period by a predetermined delay, wherein the synchronization device is also connected to the clock pulse generator for the purpose of detecting the ON period.

19. The device as recited in claim 17, wherein:

the object detection device is connected to the picture taking device and configured to detect a light-sensitive object as the at least one critical object in the picture and to assign the detected light-sensitive object to a critical direction;

a plurality of vehicle light sources are provided and oriented in different directions; and

the clock pulse generator is configured to (i) not supply current during the OFF periods to the vehicle light sources which are oriented in the critical direction, and (ii) supply current during the OFF periods to the vehicle light sources which are not oriented in the critical direction.

20. The device as recited in claim 17, wherein the at least one vehicle light source includes an LED headlight having multiple LED elements, and wherein each LED element has an individual current supply terminal in order to be supplied individually with electrical current.