Electricity: motive power systems – Periodic – repetitious or successive operations control of...
Patent
1992-06-23
1993-08-17
Ro, Bentsu
Electricity: motive power systems
Periodic, repetitious or successive operations control of...
318480, 318DIG2, B60S 108
Patent
active
052372499
ABSTRACT:
Apparatus is provided for controlling a windscreen wiping system. The apparatus includes a circuit arrangement which includes a microcontroller, a clock generator unit comprising a switch and a clock-pulse generator, an I/V converter, a phase-selective rectifier and an amplifier with a low-pass characteristic. The apparatus also includes an optoelectronic apparatus having IR beam transmitters for transmitting useful signals in clocked form and IR beam receivers for receiving the transmitted useful signals. The IR beams which are transmitted are influenced between the IR beam transmitters and the IR beam receivers by a liquid or solid coating on the screen, such that the signals received by IR beam receivers are varied in dependence upon the coating present on the screen. The amplifier filters out the interference quantities of the ambient light to obtain a processed useful signal. The signal received by the IR beam receivers are converted by the circuit arrangement into control signals by means of which operation of the drive motor is controlled. The IR beam receivers are provided with at least one load resistor, and the voltage drop at the at least one load resistor caused by rapid changes in the ambient light received by the IR beam receivers is used as a correcting quantity for the useful signal to eliminate influences of ambient light, thereby preventing unwanted triggering of the windscreen wiping system.
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Leopold Kostal GmbH & Co.
Ro Bentsu
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