Wiper Drive Control Unit Frequency Adaptation for Overheating
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Solution Overview
Problem
Wiper systems in motor vehicles face overheating issues due to high torque requirements, leading to frequent shutdowns and reduced visibility during rain, as existing solutions like thermoswitches can cause temporary loss of wiping function, posing safety risks.
Innovation Solution
A device with a control unit that adjusts the wiping frequency based on a load variable, detected through drive unit parameters like torque, voltage, and rotational speed, to prevent overheating by reducing frequency when high friction is detected, allowing for continuous operation and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermoswitch is used to protect the drive unit against overheating, then the drive unit is protected from damage, but the wiper system becomes unavailable until the drive unit cools down
Solution Approach 1:
The control unit dynamically adapts the wiping frequency based on real-time load conditions detected through drive unit parameters. When high load is detected (indicating potential overheating risk), the system automatically reduces wiping frequency to prevent overheating, while maintaining continuous operation. This dynamic adjustment resolves the contradiction by providing both protection and continuous availability.
Solution Approach 2:
The system implements feedback control by monitoring drive unit parameters (torque, voltage, rotational speed) and using this information to adjust wiping frequency. The control unit continuously detects load conditions and adapts operation accordingly, creating a closed-loop system that prevents overheating while maintaining wiper availability throughout operation.
2Temperature
If the wiping frequency is reduced to prevent overheating, then the drive unit temperature increase is avoided, but the visibility for the driver may be adversely affected
Solution Approach 1:
The system dynamically adjusts wiping frequency based on actual load conditions rather than applying a fixed reduction. When load increases indicate overheating risk, frequency is reduced proportionally. When load returns to normal levels, frequency increases back to original levels, ensuring visibility is maintained whenever conditions permit while preventing overheating when necessary.
Solution Approach 2:
The control unit changes the operational parameter (wiping frequency) based on detected load conditions. By monitoring drive unit parameters and adapting frequency accordingly, the system optimizes the balance between temperature control and visibility maintenance, adjusting the frequency parameter in response to changing operational conditions.
Data Source
AI summary
The invention relates to a device and a method for actuating a wiper system. The device comprises a drive unit (2) for driving at least one wiper arm (4), and a control unit (6), wherein the control unit (6) is designed to set a wiping frequency of the wiper arm (4) as a function of a load variable which is dependent on the torque which is to be applied by the drive unit (2) during a wiping operation.