Adaptive Front-Lighting System with Fuzzy Logic Control
First Claim
1. An adaptive front-lighting system for a vehicle, comprising:
- a plurality of LED light sources having a projection pattern for exterior illumination to supplement a main beam from a main light source;
a power supply for driving the LED light sources according to a driving signal having a magnitude between a minimum driving signal and a maximum driving signal, wherein the LED light sources sequentially illuminate in response to the magnitude of the driving signal;
a speed sensor for characterizing an instantaneous vehicle speed;
a turn sensor for characterizing an instantaneous turning radius;
a fuzzy controller generating the driving signal in response to the instantaneous vehicle speed and the instantaneous turning radius based on a fuzzy model, wherein the fuzzy model is characterized by a plurality of empirically-derived is fuzzy rules that define discontinuous values and by a plurality of modified consequents that produce a substantially continuous output.
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Abstract
An adaptive front-lighting system is provided for a vehicle, such as a passenger car, truck, or tractor trailer. A plurality of LED light sources on the vehicle have a projection pattern for exterior illumination to supplement a main beam from a main light source. A power supply drives the LED light sources according to a driving signal having a magnitude between a minimum driving signal and a maximum driving signal, wherein the LED light sources sequentially illuminate in response to the magnitude of the driving signal. A speed sensor characterizes an instantaneous vehicle speed. A turn sensor characterizes an instantaneous turning radius. A fuzzy controller generates the driving signal in response to the instantaneous vehicle speed and the instantaneous turning radius based on a fuzzy model. The fuzzy model is characterized by a plurality of empirically-derived fuzzy rules that define discontinuous values and by a plurality of modified consequents that produce a substantially continuous output.
36 Citations
16 Claims
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1. An adaptive front-lighting system for a vehicle, comprising:
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a plurality of LED light sources having a projection pattern for exterior illumination to supplement a main beam from a main light source; a power supply for driving the LED light sources according to a driving signal having a magnitude between a minimum driving signal and a maximum driving signal, wherein the LED light sources sequentially illuminate in response to the magnitude of the driving signal; a speed sensor for characterizing an instantaneous vehicle speed; a turn sensor for characterizing an instantaneous turning radius; a fuzzy controller generating the driving signal in response to the instantaneous vehicle speed and the instantaneous turning radius based on a fuzzy model, wherein the fuzzy model is characterized by a plurality of empirically-derived is fuzzy rules that define discontinuous values and by a plurality of modified consequents that produce a substantially continuous output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for illuminating supplemental LED light sources on a vehicle, each having a respective projection pattern providing exterior illumination adjacent a main beam from a main light source, the method comprising the steps of:
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characterizing an instantaneous vehicle speed in response to a speed sensor; characterizing an instantaneous turning radius in response to a turn sensor; inputting the instantaneous vehicle speed and instantaneous turning radius into a fuzzy model to generate an output comprising a driving signal with a magnitude between a minimum driving signal and a maximum driving signal; and driving the LED light sources in response to the driving signal, wherein the LED light sources sequentially illuminate according to the magnitude of the driving signal; wherein the fuzzy model is characterized by a plurality of empirically-derived fuzzy rules that define discontinuous values and by a plurality of modified consequents that produce a substantially continuous output. - View Dependent Claims (10, 11, 14, 15, 16)
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- 12. The method of claim 12 wherein the fuzzy rules correspond to empirically selected limits for the vehicle speed ranges and the turning radius ranges, a size of vehicle, and a driving environment.
Specification