Moisture actuated device for automatic control of a windscreen wiper motor
First Claim
1. A device for the automatic control of a windshield wiper motor, havinga) a moisture sensor which, in dependence on the moisture, emits a signal (S);
- b) an evaluating device which evaluates the signal (S), changing over time, from the moisture sensor;
c) a signal source which, in dependence on the changing signal (S) from the moisture sensor, emits a threshold function curve (F), the threshold function curve (F) only being changed once the signal (S) from the moisture sensor has a new extreme value;
characterized in thatd) all the changes in the signal (S) which reach or exceed a predetermined amount once the signal (S) from the moisture sensor exceeds or has exceeded the threshold function curve (F) are counted; and
e) once these changes in the signal (S) are equal to a predetermined number (Z), the windshield wiper motor is activated.
2 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a device for the automatic control of a windscreen wiper motor. The device has a moisture sensor which emits a signal depending on the moisture on the windscreen or another point on a motor vehicle so that this signal to some extent produces an analog reflection of the moisture varying in time. The output signal of the sensor is evaluated in such a way that it is continuously compared with a threshold value which can be altered. Every time this threshold value is reached or exceeded by a pulse-like change in the sensor output signal, this event is counted. After a given number Z of such events the windscreen wiper motor is switched on.
15 Citations
8 Claims
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1. A device for the automatic control of a windshield wiper motor, having
a) a moisture sensor which, in dependence on the moisture, emits a signal (S); -
b) an evaluating device which evaluates the signal (S), changing over time, from the moisture sensor; c) a signal source which, in dependence on the changing signal (S) from the moisture sensor, emits a threshold function curve (F), the threshold function curve (F) only being changed once the signal (S) from the moisture sensor has a new extreme value;
characterized in thatd) all the changes in the signal (S) which reach or exceed a predetermined amount once the signal (S) from the moisture sensor exceeds or has exceeded the threshold function curve (F) are counted; and e) once these changes in the signal (S) are equal to a predetermined number (Z), the windshield wiper motor is activated. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Device for the automatic control of a windscreen wiper motor comprising
a) a moisture sensor which outputs a signal (S) as a function of the moisture; -
b) an evaluation device which evaluates the signal (S) changing over time of the moisture sensor; characterized in that c) a threshold value function curve (F) is determined as a function of the signal (S); d) the amplitude of the signal (S) within a predetermined time is compared with the associated amplitude values of the threshold function curve; and e) at a predetermined number of successive comparisons in which the interval between signal (S) and function curve (F) becomes continuously smaller, the windshield wiper motor is activated.
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Specification