Control device for a windscreen wiper device
First Claim
1. A control device for the drive motor of a windshield wiper device on a vehicle, in particular a motor vehicle, comprising a manually operated wiper switch with at least first, second and third switching stages wherein automatic operation based on the characteristic curve is assigned to the first switching stage and fixed speeds are assigned to the second and third switching stages, a control circuit, a rain sensor that is connected to the control circuit, a light sensor that is connected to the control circuit, a temperature sensor that is connected to the control circuit, wherein characteristic curves are deposited in the control circuit in dependence on the output signals from the rain sensor, the light sensor and the temperature sensor, which characteristic curves contain the operating data for the drive motor, and whereina rain-dependent standard characteristic curve is deposited in the control circuit and if at least one value for temperature or light intensity falls below its limit value in the control circuit during the windshield wiper operation, the control circuit causes a limit characteristic curve that is changed relative to a the standard characteristic curve to be made available and used for control, with these standard and limit characteristic curves have having a common fixed upper end point (M).
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Accused Products
Abstract
A control device for the drive motor of a windscreen wiper device in a vehicle, especially a motor vehicle, comprising a control switch which can be activated by means of a manually actuated wiper switch and which automatically controls the drive motor in a switching stage of said wiper switch according to a rain sensor signal corresponding to a characteristic curve. The operating data for the drive motor varies according to the external effects of lighting, temperature, or speed parameters.
46 Citations
22 Claims
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1. A control device for the drive motor of a windshield wiper device on a vehicle, in particular a motor vehicle, comprising a manually operated wiper switch with at least first, second and third switching stages wherein automatic operation based on the characteristic curve is assigned to the first switching stage and fixed speeds are assigned to the second and third switching stages, a control circuit, a rain sensor that is connected to the control circuit, a light sensor that is connected to the control circuit, a temperature sensor that is connected to the control circuit, wherein characteristic curves are deposited in the control circuit in dependence on the output signals from the rain sensor, the light sensor and the temperature sensor, which characteristic curves contain the operating data for the drive motor, and wherein
a rain-dependent standard characteristic curve is deposited in the control circuit and if at least one value for temperature or light intensity falls below its limit value in the control circuit during the windshield wiper operation, the control circuit causes a limit characteristic curve that is changed relative to a the standard characteristic curve to be made available and used for control, with these standard and limit characteristic curves have having a common fixed upper end point (M).
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22. A method of controlling a drive motor of a windshield wiper device on a vehicle, in particular a motor vehicle, having a control arrangement comprising a manually operated wiper switch with at least first second and third switching stages wherein automatic operation based on a characteristic curve is assigned to the first switching stage and fixed speeds are assigned to the second and third switching stages, a control circuit for activating the wiper switch and controlling the drive motor for the wiper switch based on a characteristic curve, a rain sensor, a light sensor and a temperature sensor that are each connected to the control circuit, said method comprising:
providing characteristic curves in the control circuit in dependence on the output signals from the rain sensor, the light sensor and the temperature sensor, which characteristic curves contain operating data for the drive motor, and controlling the motor based on the characteristic curves; and
wherein one of the characteristic curves contained in the control circuit is a rain-dependent standard characteristic curve, and further comprising, if at least one value for temperature or light intensity falls below its respective limit value in the control circuit during the windshield wiper operation, providing a limit characteristic curve that is changed relative to the standard characteristic curve and has a fixed same upper end point (M) as the characteristic curve, and using the limit characteristic curve for subsequent control by the control circuit.
Specification