Automatic windshield wiper speed control with piezoelectric sens

Details Automatic windshield wiper speed control with piezoelectric sens Automatic windshield wiper speed control with piezoelectric sens

1983-08-30

1985-07-02

Shoop, William M.

Electricity: motive power systems

Periodic, repetitious or successive operations control of...

Variable periods or intervals between controlling operations

318DIG2, 15250C, H02P 104

Patent

active

045271054

ABSTRACT:
A wiper speed control system for an automotive wiper controls the operational speed of a wiper in accordance with rain conditions. The control system includes a rain sensor detecting rain conditions to produce an analog signal having an amplitude depending upon the detected rain conditions. The analog sensor signal is converted into a digital pulse signal by a converter for application to a digital circuit system. A control signal is produced by digitally processing the pulse signal. The control signal is applied to a wiper driver circuit to adjust the operational speed or timing in accordance with the control signal.

REFERENCES:
patent: 3830103 (1974-08-01), Andrjkovics et al.
patent: 3926120 (1975-12-01), Williams et al.
patent: 4329631 (1982-05-01), Betsch et al.
patent: 4375610 (1983-03-01), Nagaoka et al.
patent: 4388574 (1983-06-01), Bois et al.
patent: 4389603 (1983-06-01), Kogawa et al.
Electronic Design, vol. 27, p. 19, Sep. 13, 1979.

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