Wiper Control Device with Direct Driving Switch for Manual Positioning
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Solution Overview
Problem
Conventional wiper control devices cannot meet driver demands for positioning wipers at specific locations on a windshield and fail to operate if the Micro Controller Unit (MCU) fails, posing a risk during rainy conditions.
Innovation Solution
A wiper control device with a first output IC, direct driving switch, and second output IC, where the MCU controls the second output IC to drive wipers based on a signal from the direct driving switch, allowing wipers to be moved to any specific position even in an IG2 OFF state and ensuring minimal operation in case of MCU failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the conventional wiper control device automatically moves wipers to parking position upon IG2 OFF state, then the wiper operation is simplified, but the driver cannot position wipers at specific locations on the windshield
Solution Approach 1:
The system dynamically switches between automatic parking mode (when direct driving switch is not activated) and manual positioning mode (when direct driving switch is activated). The MCU monitors the switch state and changes control behavior accordingly, allowing wipers to be positioned at specific locations when needed while maintaining automatic parking functionality for normal operations.
2Device complexity
If the wiper system relies on the MCU for control, then the control functionality is integrated, but the wipers fail to operate when the MCU fails
Solution Approach 1:
The direct driving switch acts as an intermediary component that provides an alternative control path. When the MCU fails, the switch can directly activate the second output IC to drive the wiper motor, bypassing the failed MCU. This intermediary mechanism ensures basic wiper functionality is maintained even when the primary control system fails.
Solution Approach 2:
The system incorporates a backup control mechanism through the direct driving switch that activates when the primary MCU control fails. This beforehand cushioning ensures that wiper functionality is preserved in failure scenarios, providing reliability against MCU failures by having a pre-prepared alternative control path.
3Device complexity
If the wiper control device uses only the MCU for control signals, then the control logic is centralized, but wipers cannot operate in IG2 OFF state for direct driving
Solution Approach 1:
The control system is segmented into multiple independent components: the first output IC for power supply control, the direct driving switch for manual activation, the second output IC for motor control, and the MCU for intelligent control. This segmentation allows different components to operate in different ignition states, enabling direct driving functionality in IG2 OFF state while maintaining centralized intelligent control when IG2 is ON.
Data Source
AI summary
Provided is a wiper control device. The device includes a first output IC, a direct driving switch, a second output IC, and an MCU. The first output IC supplies a power source for a wiper operation control in IG2 OFF state. The direct driving switch directly drives wipers. The second output IC intermits the power source to a wiper motor. The MCU controls the second output IC to drive the wipers depending on the direct driving switch.