Vehicle Wiper Device Inverted Washer Fluid Spray Direction
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Solution Overview
Problem
Existing vehicle wiper devices often wipe away washer fluid before it can effectively remove view-obstructing materials like dirt, leading to inefficient cleaning.
Innovation Solution
A vehicle wiper device with a wiper motor, washer pump, direction controller, and control unit that coordinates the wiping operation with the spraying of washer fluid, allowing the fluid to be directed opposite to the wiper blade's movement direction to ensure effective cleaning, and optionally includes features like meander-forming sections for even spray distribution and adjustable spray pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If washer fluid is sprayed toward the movement direction side of the wiper blade, then the cleaning fluid can be applied to the wiping surface, but the fluid is immediately wiped away before acting effectively on view-obstructing material
Solution Approach 1:
The patent inverts the conventional spray direction by directing washer fluid toward the opposite direction side of the wiper blade movement. This reversal prevents the fluid from being immediately wiped away, allowing it to remain on the wiping surface long enough to effectively dissolve and remove view-obstructing material such as dirt and grime.
Solution Approach 2:
The system performs preliminary action by spraying washer fluid onto the wiping surface before the wiper blade arrives. The fluid is directed to penetrate and soften view-obstructing material in advance, ensuring that when the wiper blade contacts the surface, the material has already been compromised and is easier to remove.
2Area of stationary object
If washer fluid is sprayed in multiple directions, then cleaning coverage is improved, but the system complexity increases
Solution Approach 1:
The spray system is segmented into multiple independent nozzle units distributed across the wiper blade structure. Each nozzle can be controlled independently to spray washer fluid at different locations and angles, achieving comprehensive cleaning coverage without requiring a single complex spray mechanism.
Solution Approach 2:
The spray system incorporates adjustable nozzles that can dynamically change spray direction and angle based on operational conditions. This dynamic adjustment capability allows the system to optimize fluid distribution across the wiping surface while maintaining a relatively simple overall structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device efficiently removes view-obstructing materials by ensuring the washer fluid acts on the dirt without being immediately wiped away, and the meandering spray trajectory and adjustable spray pressure enhance cleaning coverage and effectiveness.
Implementation Method 1
The washer pump conveys washer fluid under pressure to a spray portion provided to at least one out of the wiper blade or the wiper arm so as to cause washer fluid to be sprayed from the spray portion toward the wiping surface.
Data Source
AI summary
When an operation signal of a view-obstructing material removal mode switch has been detected, a controller controls such that wiping operation is performed while spraying washer fluid toward the opposite side to a movement direction side of a wiper blade, after which a wiping operation in which washer fluid is not sprayed is performed.