Wiper Control System Wind Pressure Management
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Solution Overview
Problem
Existing wiper systems face issues with wind pressure causing unintended movement of the wiper during intermittent operational mode, reducing effectiveness in maintaining visibility during high-speed vehicle travel.
Innovation Solution
A wiper system with an electric motor, entering means, and control means that allows the wiper to be pivotably supported for reciprocal swinging between upper and lower return positions, with the control means controlling the motor to stop the wiper at a predetermined position on the outer side of the lower return position, reducing wind pressure influence, and then resuming operation, thereby limiting unintended movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wiper is stopped at the lower return position during intermittent operational mode, then the wiper can remain stationary for a period, but the wiper may be disadvantageously lifted by head wind from the lower return position toward the upper return position
Solution Approach 1:
The control means determines whether to stop the wiper at the lower return position or at a predetermined position before reaching the lower return position based on vehicle speed information. When vehicle speed exceeds a predetermined threshold, the wiper is stopped at the predetermined position where wind pressure influence is smaller, preventing the wiper from being lifted by head wind before it can occur
Solution Approach 2:
The stopping position of the wiper is dynamically changed based on vehicle speed parameters. At low speeds, the wiper stops at the lower return position for complete drainage. At high speeds, the wiper stops at a predetermined position before the lower return position where wind pressure is reduced, thus preventing unintended movement while still maintaining effectiveness
Data Source
AI summary
A wiper is continuously reciprocally swung between an upper return position and a lower return position by controlling an electric motor when an operational command for executing a continuous operational mode is entered by a user through a wiper switch. The wiper is reciprocally swung after stopping of the wiper for a predetermined time period at a predetermined position, which is located on an outer side of the lower return position that is opposite from the upper return position in a swing direction of the wiper and at which an influence of a wind pressure applied to the wiper is smaller in comparison to the lower return position, by controlling the electric motor when an operational command for executing an intermittent operational mode is entered through the entering means.