Device and method for detecting the environment change of windshield
First Claim
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1. A device for detecting environmental change of an automobile windshield, comprising:
- a plane capacitor including two electrodes disposed on a common plane on an inner surface of said windshield, the electrodes having a total area of less than 100 cm2, environmental change of said windshield effecting a change in capacitance of the plane capacitor; and
a sensor circuit operatively coupled with the plane capacitor and adapted to couple test signals to the plane capacitor and receive said test signals therefrom modified in relation to said change in capacitance so as to develop change signals corresponding to environmental change of said windshield, such that equipment working on said windshield in response to the change signals operates in closed-loop fashion to affect said environmental change of said windshield;
said sensor circuit including a signal generator adapted to generate said test signals, a programme-controlled analog signal magnifier and filter circuit adapted to receive the test signals as modified and output DC voltage signals in relation thereto, an analog-to-digital conversion circuit to convert the DC voltage signals to digital signals, and a micro-processor adapted to digitally process the digital signals and output change signals for control of said equipment.
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Abstract
A device and method for detecting environmental change of automobile windshield includes a plane capacitor having two electrodes disposed on a common plane on the inner surface of the windshield, and with a total area of said two electrodes less than 100 sq. centimeters. A sensor detection circuit is responsive to the change of capacitance of the plane capacitor to produce a control signal to control equipment work.
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Citations
19 Claims
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1. A device for detecting environmental change of an automobile windshield, comprising:
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a plane capacitor including two electrodes disposed on a common plane on an inner surface of said windshield, the electrodes having a total area of less than 100 cm2, environmental change of said windshield effecting a change in capacitance of the plane capacitor; and a sensor circuit operatively coupled with the plane capacitor and adapted to couple test signals to the plane capacitor and receive said test signals therefrom modified in relation to said change in capacitance so as to develop change signals corresponding to environmental change of said windshield, such that equipment working on said windshield in response to the change signals operates in closed-loop fashion to affect said environmental change of said windshield; said sensor circuit including a signal generator adapted to generate said test signals, a programme-controlled analog signal magnifier and filter circuit adapted to receive the test signals as modified and output DC voltage signals in relation thereto, an analog-to-digital conversion circuit to convert the DC voltage signals to digital signals, and a micro-processor adapted to digitally process the digital signals and output change signals for control of said equipment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for detecting environmental change of an automobile windshield wherein a plane capacitor including two electrodes disposed on a common plane are on an inner surface of the windshield, the electrodes having a total area of less than 100 cm2, environmental change of said windshield effecting a change in capacitance of the plane capacitor, the method comprising the steps of:
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(a) coupling test signals to the plane capacitor; (b) receiving test signals from the plane capacitor modified in relation to said change in capacitance; (c) outputting DC voltage signals in relation to the received test signals; (d) converting the DC voltage signals to digital signals; (e) digitally processing the digital signals to develop change signals corresponding to environmental change of the windshield; (f) transmitting the change signals to equipment working on the windshield whereby to affect said environmental change of the windshield; and (g) repeating steps (a) through (f) whereby to operate in closed-loop fashion. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification