Electricity: motive power systems – Periodic – repetitious or successive operations control of...
Patent
1997-01-10
1998-10-20
Ro, Bentsu
Electricity: motive power systems
Periodic, repetitious or successive operations control of...
318DIG2, B60S 108
Patent
active
058251480
DESCRIPTION:
BRIEF SUMMARY
This application is a National Stage application of International Application PCT/DE95/01636, filed on Nov. 23, 1995, published as WO96/19366 Jun. 27, 1996.
BACKGROUND OF THE INVENTION
The invention relates to a circuit arrangement, particularly for a wiper arrangement for motor vehicle windshields having an electric wiper motor and a step-switching unit for the wiper motor that can be actuated via a control device, and wherein at least one output of the control device that is assigned to a specific wiper speed is connected with at least one input of the step-switching unit that determines this wiper speed.
PRIOR ART
The use of wiper arrangements in motor vehicles for motor vehicle windshields that have an electric wiper motor is known. For the actuation of the wiper motor, control devices are known, which use so-called rain sensors to detect the amount of moisture hitting the outside of the motor vehicle. Depending on the amount of moisture, that is how heavy the rain is, the control device supplies varying control signals to the wiper motor. For this, a step switching unit is connected in series before the wiper motor, which permits a varying connection of the wiper motor, for example with two different speeds. The wiper motor is connected via the control device and the step switching unit on the one hand with a voltage source while, on the other hand, a coil reversal for the wiper motor is realized, which permits a varying wiper speed for the wiper motor.
However, one disadvantage with the known circuit arrangements is that in case of a failure of the control device, it is no longer possible to actuate the wiper motor and thus the wiper arrangements of the motor vehicle. An actuation of the wiper arrangement is impossible, for example, if the control device fails during a specific use of the motor vehicle at a time when it is raining. The drive would thus have to be interrupted until the rain stops.
SUMMARY AND ADVANTAGES OF THE INVENTION
The above drawbacks of the prior art arrangements generally are overcome according to the present invention by a circuit arrangement, in particular for a wiper arrangement for motor vehicle windshields, having an electric wiper motor and a step-switching unit for the wiper motor that can be actuated via a control device, wherein: at least one output of the control device that is assigned to a specific wiper speed is connected with at least one input of the step-switching unit that determines this wiper speed; a switching means is parallel-connected to the outputs of the control device via which switching means a voltage source (U.sub.bat) can be connected to the inputs of the step-switching unit that are assigned to the outputs of the control device (12); the step-switching unit has first and second switching stages that can be actuated via the two inputs; the first switching stage, which is connected to and actuated by the first input of the step-switching unit, establishes a connection to the voltage source (U.sub.bat); and the second switching stage connects the output of the first switching stage with one of two inputs of the wiper motor.
On the other hand, the circuit arrangement according to the invention described above has the advantage that an actuation of the wiper arrangement for the motor vehicle is possible even if the control device fails. Owing to the fact that a switching means is connected parallel to the control outputs of the control device, by way of which a voltage source can be connected to the inputs of the step-switching unit that are assigned to the outputs of the control device, the defective control device can be bridged in a simple way, so that an actuation of the wiper arrangement becomes possible. Through this additional option for intervening manually in the circuit arrangement for actuating the wiper motor, it is possible to maintain an emergency operation of the wiper arrangement if the control device has failed. By securing the wiper operation of the wiper arrangement in this way, it is possible, for example, to continue a dri
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Blitzke Henry
Hog Norbert
Meier Hans
Pientka Rainer
Riehl Guenther
Ro Bentsu
Robert & Bosch GmbH
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