Automatic vehicle exterior light control

Abstract

A system for automatically controlling continuously variable headlamps on a controlled vehicle includes an imaging system capable of determining lateral and elevational locations of headlamps from oncoming vehicles and tail lamps from leading vehicles. The system also includes a control unit that can acquire an image from in front of the controlled vehicle. The image covers a glare area including points at which drivers of oncoming and leading vehicles would perceive the headlamps to cause excessive glare. The image is processed to determine if at least one oncoming or leading vehicle is within the glare area. If at least one vehicle is within the glare area, the headlamp illumination range is reduced. Otherwise, the illumination range is set to full illumination range.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of U.S. patent application Ser. No. 10 / 617,323, entitled “CONTINUOUSLY VARIABLE HEADLAMP CONTROL,” filed on Jul. 10, 2003, by Joseph S. Stam et al., which is a continuation of U.S. patent application Ser. No. 10 / 197,834, entitled “CONTINUOUSLY VARIABLE HEADLAMP CONTROL,” filed on Jul. 18, 2002, by Joseph S. Stam et al., now U.S. Pat. No. 6,593,698, which is a continuation of U.S. patent application Ser. No. 09 / 938,774, entitled “CONTINUOUSLY VARIABLE HEADLAMP CONTROL,” filed on Aug. 24, 2001, by Joseph S. Stam et al., now U.S. Pat. No. 6,429,594, which is a continuation of U.S. patent application Ser. No. 09 / 546,858, entitled “CONTINUOUSLY VARIABLE HEADLAMP CONTROL,” filed on Apr. 10, 2000, by Joseph S. Stam et al., now U.S. Pat. No. 6,281,632, which is a continuation of U.S. patent application Ser. No. 09 / 157,063, entitled “CONTINUOUSLY VARIABLE HEADLAMP CONTROL,” filed on Sep. 18, 1998, by Joseph S. ...

AI Technical Summary

Benefits of technology

"The present invention is a control system for continuously variable headlamps that can adjust the aim and intensity of headlamps based on the detection of headlamps and tail lights from oncoming and leading vehicles. The system can automatically control the headlamps to prevent glare and ensure smooth transition of headlamps between high and low beam modes. It can also adjust the illumination range based on the ambient light level and the vehicle's position in relation to the road surface. The system includes an imaging system capable of detecting the lateral and elevational locations of headlamps, and a control unit that can acquire an image from in front of the headlamps and process it to determine if a vehicle is within the glare area. The control system can also reduce the illumination range by decreasing the intensity of the high beam headlamp and increasing the intensity of the low beam headlamp. The system can also incorporate the imaging system into the rearview mirror mount and adjust the vertical aim direction of the headlamps based on the vehicle's pitch relative to the road surface."

Problems solved by technology

Also, continuously varying the headlamp illumination does not create rapid changes in illumination that may startle the driver.

The increased brightness and bluish color of the HID lamps is particularly disrupting to oncoming drivers.

Due to this disruptness effect, certain European countries require headlamp leveling systems if HID lamps are used on a vehicle.

One problem with current continuously variable headlamp control systems is the inability to consider oncoming or leading vehicles in determining the illumination range of headlamps.

This design presents many problems.

Second, placing the image sensor on the lower front portion of the vehicle may result in imaging surfaces being coated with dirt and debris.

Third, placing the image sensor close to the headlamp beam makes the system subject to the masking effects of scattered light from fog, snow, rain, or dust particles in the air.

Fourth, this system has no color discriminating capability and, with only five pixels of resolution, the imaging system is incapable of accurately determining lateral and elevational locations of headlamps or tail lights at any distance.

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