Vehicle Wiper Control Logic for Scratch Prevention
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Solution Overview
Problem
Vehicle windshield wiper systems face issues when transitioning from off to on, as conditions on the windshield can change, leading to undesirable wiper movement, such as scratching or impeded movement due to moisture evaporation or ice formation, and existing systems lack efficient automatic deactivation in manual mode.
Innovation Solution
A processor-controlled system that determines the wiper mode and automatically deactivates the wiper system by returning wipers to a park position when the vehicle is turned off, allowing for safe reactivation without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wiper system is configured to resume movement when the vehicle is turned on, then the wipers will continue operation without interruption, but this causes scratching or damage when moisture has evaporated or ice has formed on the surface
Solution Approach 1:
The system performs preliminary detection of surface conditions (moisture presence, ice formation) before allowing wiper movement to resume. The processor evaluates sensor data and determines whether the windshield surface is safe for wiper operation, preventing movement when harmful conditions are detected.
Solution Approach 2:
Sensor systems act as intermediaries between the wiper control system and the windshield surface conditions. These sensors detect moisture, ice, or other surface states and transmit information to the processor, which then decides whether to permit wiper resumption, thereby mediating between operational continuity and surface protection.
2Object-affected harmful factors
If the wipers are automatically deactivated when the vehicle is turned off, then surface damage is prevented, but this causes conflict with manual mode operation where the latching wiper lever indicates activation
Solution Approach 1:
The system dynamically adjusts its behavior based on the detected operation mode. When manual mode is detected (latching wiper lever in activated position), the system maintains wiper activation status and allows user control. When automatic mode is detected, the system automatically deactivates wipers when the vehicle is turned off. This dynamic adaptation resolves the conflict between automatic protection and user control consistency.
Solution Approach 2:
The system changes the operational parameter of wiper activation status based on the detected mode. In manual mode, the activation parameter remains unchanged when the vehicle is turned off, preserving user intent. In automatic mode, the activation parameter is changed to deactivated, providing automatic protection. This parameter change approach allows the system to adapt its behavior to different operational contexts.
3Reliability
If the system determines operation mode to enable automatic deactivation, then safe wiper resumption is ensured, but this increases system complexity requiring mode detection and conditional control logic
Solution Approach 1:
The processor is designed to perform multiple functions: detecting operation mode, evaluating surface conditions, determining safe resumption, and controlling wiper activation. By making the processor universal and multi-functional, the system avoids adding separate dedicated components for each function, thereby managing complexity while maintaining reliability.
Solution Approach 2:
The system merges the mode detection function with the existing wiper control logic. Rather than adding a separate mode detection system, the processor integrates mode identification into its existing decision-making process, combining multiple control functions into a unified control architecture that reduces overall system complexity.
Data Source
AI summary
Methods and an apparatus are provided for controlling a wiper system of a type that can operate in an automatic mode wherein the wiper system is deactivated automatically and in a manual mode wherein the wiper system is deactivated by a user, the wiper system including at least one wiper configured to move across a surface of a vehicle. The apparatus comprises a motor coupled to the at least one wiper for moving the at least one wiper across the surface and a processor in operable communication with the motor. The processor is configured to detect when the wiper system is operating in the automatic mode and return the at least one wiper to a predetermined position, and deactivate the wiper system, if the wiper system is operating in the automatic mode and the vehicle is turned off.