Driving assistance device and driving assistance method
First Claim
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1. A device for assisting with driving an automotive vehicle comprising:
- a variable transmission screen placed between a road scene (SR) and a driver of said vehicle;
a control unit for generating signals to control a transmission coefficient of said variable transmission screen, said control unit controlling power supplied to said variable transmission screen that varies periodically between a maximum transmission coefficient when a transparency of said variable transmission screen is at a maximum and a minimum transmission coefficient when the transparency of said variable transmission screen is at a minimum;
wherein said device further comprises a glare-evaluating means for sensing glare, said control unit being configured to modify said transmission coefficient of said variable transmission screen depending on said glare measured by said glare-evaluating means;
wherein said vehicle being equipped with at least one illuminating device able to emit a beam for illuminating said road scene (SR) in front of said vehicle, said control unit is configured to, when active, control a light emission of at least one light source of said at least one illuminating device and said transmission coefficient of said variable transmission screen, in relation to each other;
wherein said control unit is configured to, when active, control said light emission with a first periodic pulsed signal of period (T) and a first duty cycle (R1) and said transmission coefficient of said variable transmission screen with a second periodic pulsed signal of period (T) and a second duty cycle (R2), said device being configured to modify said coefficient of transparency of said variable transmission screen by modifying said second pulsed periodic signal so that said second duty cycle (R2) takes a value between;
its maximum when said glare measured by said glare-evaluating means is below a first threshold; and
said first duty cycle (R1) when said glare measured by said glare-evaluating means is above a second threshold.
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Abstract
A device for assisting with driving an automotive vehicle comprising a variable transmission screen intended to be placed between a road scene (SR) and a driver of the vehicle, the assisting device being configured to, when active, control a transmission coefficient of the variable transmission screen. The device comprises a glare sensor and is furthermore configured to modify the coefficient of transparency of the variable transmission screen depending on the glare measured by the glare sensor. In addition, a method for assisting with driving the automotive vehicle is included.
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Citations
16 Claims
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1. A device for assisting with driving an automotive vehicle comprising:
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a variable transmission screen placed between a road scene (SR) and a driver of said vehicle; a control unit for generating signals to control a transmission coefficient of said variable transmission screen, said control unit controlling power supplied to said variable transmission screen that varies periodically between a maximum transmission coefficient when a transparency of said variable transmission screen is at a maximum and a minimum transmission coefficient when the transparency of said variable transmission screen is at a minimum; wherein said device further comprises a glare-evaluating means for sensing glare, said control unit being configured to modify said transmission coefficient of said variable transmission screen depending on said glare measured by said glare-evaluating means; wherein said vehicle being equipped with at least one illuminating device able to emit a beam for illuminating said road scene (SR) in front of said vehicle, said control unit is configured to, when active, control a light emission of at least one light source of said at least one illuminating device and said transmission coefficient of said variable transmission screen, in relation to each other; wherein said control unit is configured to, when active, control said light emission with a first periodic pulsed signal of period (T) and a first duty cycle (R1) and said transmission coefficient of said variable transmission screen with a second periodic pulsed signal of period (T) and a second duty cycle (R2), said device being configured to modify said coefficient of transparency of said variable transmission screen by modifying said second pulsed periodic signal so that said second duty cycle (R2) takes a value between; its maximum when said glare measured by said glare-evaluating means is below a first threshold; and said first duty cycle (R1) when said glare measured by said glare-evaluating means is above a second threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for assisting with driving an automotive vehicle with a variable transmission screen placed between a road scene (SR) and a driver of said vehicle and at least one illuminating device able to emit a beam for illuminating said road scene (SR) in front of said vehicle, said method comprising the steps of:
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controlling a transmission coefficient of said variable transmission screen with a pulsed signal from a control unit; modifying said transmission coefficient of said variable transmission screen depending on glare measured by a glare sensor; wherein said control unit is configured to allow a light emission of at least one light source of said illuminating device and said transmission coefficient to be controlled in relation to each other; controlling said light emission of said at least one illuminating device with a first periodic pulsed signal of period (T) and a first duty cycle (R1) and said transmission coefficient of said variable transmission screen with a second periodic pulsed signal of period (T) and a second duty cycle (R2); and modifying said transmission coefficient of said variable transmission screen with a second periodic pulsed signal, so that said second duty cycle (R2) takes a value between; its maximum when said glare measured by said glare-evaluating means is below a first threshold; and said first duty cycle (R1) when said glare measured by said glare-evaluating means is above a second threshold. - View Dependent Claims (14)
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15. A method for assisting with driving an automotive vehicle with a variable transmission screen placed between a road scene (SR) and a driver of said vehicle and at least one illuminating device able to emit a beam for illuminating said road scene (SR) in front of said vehicle, said method comprising the steps of:
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controlling a transmission coefficient of said variable transmission screen with a pulsed signal from a control unit; modifying said transmission coefficient of said variable transmission screen depending on glare measured by a glare sensor; wherein said control unit is configured to allow a light emission of at least one light source of said illuminating device and said transmission coefficient to be controlled in relation to each other; and wherein allowing said light emission is performed by modifying an amplitude of a first periodic pulsed signal. - View Dependent Claims (16)
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Specification