Device for operating a windshield wiper

Details Device for operating a windshield wiper Device for operating a windshield wiper

1997-02-03

1998-12-08

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340602, 318444, 318483, 318DIG2, 15250001, G08B 2100

Patent

active

058476547

ABSTRACT:
An apparatus for operating a windshield wiper having an automatic wiper control. The apparatus is provided with a rain sensor having a light-emitting transmitter and a receiver that responds to the emitted light by emitting a sensor signal, and an evaluation device for the sensor signal. The evaluation device has a microcomputer and a capacitor that is outside of the microcomputer and to which the sensor signal is supplied. Also included is a comparator connected to the capacitor for comparing the voltage built up at the capacitor by the sensor signal to a threshold voltage and for emitting an output signal if the threshold voltage is exceeded. The microcomputer forms a measured value from the output signal, the value of which correspond to a time at which the threshold is exceeded.

REFERENCES:
patent: 4613802 (1986-09-01), Kraus et al.
patent: 4710878 (1987-12-01), Iyoda
patent: 4740735 (1988-04-01), Hayashi
patent: 4859867 (1989-08-01), Larson et al.
patent: 5059877 (1991-10-01), Teder
patent: 5581240 (1996-12-01), Egger
Patent Abstracts of Japan, vol. 009, No. 025 (M-355), Feb. 2, 1985 and JP 59 171738 A (Nissan Jidosha KK), 28 Sep. 1984.
Patent Abstracts Oof Japan, vol. 017, No. 414 (M-1456), Apr. 3, 1993 and JJP 05 085310 A (Fujitsu Ten Ltd), Apr. 5, 1993.

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