Electricity: motive power systems – Automatic and/or with time-delay means – Moisture content or wetness
Patent
1994-05-24
1996-07-23
Sircus, Brian
Electricity: motive power systems
Automatic and/or with time-delay means
Moisture content or wetness
318DIG2, B60S 108
Patent
active
055392890
ABSTRACT:
An ultrasonic detection device having a transducer (10) for emitting and receiving ultrasonic pulses through a windshield, and producing an echo signal (40,50) representative of the reflected pulses. The detection device also includes an amplifier (23) for amplifying the echo signals (40,50) by a selectable gain, an integrating circuit (26) for integrating each of the echo signals (40,50) during a selected time period (62,63) so as to produce an integral value, amplifier control circuitry (27,28) measuring the integral value and selecting the gain of the amplifier so as to maintain the integral value at a steady-state value, and the temporal deviation of the integral value from the steady-state value is measured to determine if it is greater than a predetermined threshold value. The invention may be used to detect water on a windscreen and to control the operation of a windscreen cleaning system.
REFERENCES:
patent: 4542325 (1985-09-01), Kobayashi et al.
patent: 4705998 (1987-11-01), Millerd et al.
patent: 5140233 (1992-08-01), Wallrafen
patent: 5203207 (1993-04-01), Sugiyama
patent: 5266873 (1993-11-01), Arditi et al.
Asulab S.A.
Sircus Brian
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