Sensing device for determining a rain rate
First Claim
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1. A vehicle comprising:
- a vehicle glazing;
at least one wiper blade for moving across said glazing to remove raindrops from said glazing;
a controller operatively connected to said wiper blade for activating said wiper blade;
a piezoelectric sensor mounted to said glazing that produces an analog signal proportional to vibrations caused by raindrops striking said glazing;
an amplifier electrically connected to said piezoelectric sensor for increasing an amplitude of said analog signal;
an analog-to-digital converter electrically connected to said amplifier for converting said analog signal into digital values; and
a processor electrically connected to said analog-to-digital converter and said controller for computing a rain rate with said digital values in an equation derived from a point process equation and for providing said rain rate to said controller such that said controller automatically operates said wiper blade to remove raindrops based on said rain rate.
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Abstract
A sensing device includes a piezoelectric vibration sensor mounted to a surface for producing an analog signal proportional to raindrops striking the surface, an amplifier, an analog-to-digital converter, and a processor for calculating the rain rate based on an exponential probability density function of a first order point process.
70 Citations
35 Claims
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1. A vehicle comprising:
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a vehicle glazing;
at least one wiper blade for moving across said glazing to remove raindrops from said glazing;
a controller operatively connected to said wiper blade for activating said wiper blade;
a piezoelectric sensor mounted to said glazing that produces an analog signal proportional to vibrations caused by raindrops striking said glazing;
an amplifier electrically connected to said piezoelectric sensor for increasing an amplitude of said analog signal;
an analog-to-digital converter electrically connected to said amplifier for converting said analog signal into digital values; and
a processor electrically connected to said analog-to-digital converter and said controller for computing a rain rate with said digital values in an equation derived from a point process equation and for providing said rain rate to said controller such that said controller automatically operates said wiper blade to remove raindrops based on said rain rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A vehicle glazing for determining a rain rate, said glazing comprising:
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at least one glazing pane;
a piezoelectric sensor mounted to said glazing pane and producing an analog signal proportional to vibrations caused by raindrops striking said glazing pane;
an amplifier electrically connected to said piezoelectric sensor for increasing an amplitude of said analog signal;
an analog-to-digital converter electrically connected to said amplifier for converting said analog signal into digital values; and
a processor electrically connected to said analog-to-digital converter for computing a rain rate with said digital values in an equation derived from a point process equation to determine the rain rate. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A sensing device for determining a rain rate on a surface, said device comprising:
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a piezoelectric sensor that produces an analog signal proportional to vibrations caused by raindrops striking the surface;
an amplifier operatively connected to said piezoelectric sensor for increasing an amplitude of said analog signal;
an analog-to-digital converter operatively connected to said amplifier for converting said analog signal into digital values; and
a processor operatively connected to said analog-to-digital converter for computing the rain rate using said digital values in an equation derived from a point process equation to determine the rain rate. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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Specification