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Driving assistance device and driving assistance method

  • US 9,623,728 B2
  • Filed: 09/23/2014
  • Issued: 04/18/2017
  • Est. Priority Date: 09/26/2013
  • Status: Active Grant
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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